A sludge drying device

Abstract

The present invention proposes a sludge drying device, including an auger conveyor and a microwave heater. The main shaft of the auger conveyor includes a front section main shaft and a rear section main shaft, and the spiral blades include a front section blade and a rear section blade. The front section main shaft and the front section blade are made of carbon steel, and the rear section main shaft and the rear section blade are made of silicon carbide. A plurality of microwave heaters are provided, and the microwave heaters are fixedly connected to the top cover to heat the sludge in the conveying cavity. The microwave heaters are arranged above the front section blade and above the rear section blade respectively. The sludge is first preliminarily dried at the front section blade to remove the main water, and then enters the rear section blade for deep drying to complete deep dehydration, which can improve the drying efficiency and the utilization rate of thermal energy. By selecting silicon carbide material for processing the rear section main shaft and the rear section blade, on the one hand, the good wave absorption of silicon carbide can be used to deeply dry the sludge after preliminary drying, and on the other hand, the processing cost of the equipment can be reduced, which is easy to promote.

Description

Technical Field

[0001] The invention relates to the technical field of sludge treatment, and in particular to a sludge drying device. Background Art

[0002] Municipal sludge is one of the main solid wastes generated in urban development. The main requirements for solid waste treatment are reduction, harmlessness and resource utilization. Reduction is the primary requirement for solid waste treatment. For sludge, the core of its reduction treatment is to reduce its moisture content, that is, sludge drying, which is not only convenient for the storage and transportation of sludge, but also provides favorable conditions for terminal treatment such as sludge incineration and pyrolysis. At present, the main methods of sludge drying include solar drying, steam indirect drying, flue gas waste heat drying and mechanical filter pressing drying. Solar drying is to heat the sludge by directly drying and absorbing the heat of solar radiation. The cost is extremely low, but the required area is large and the odor is released, making management difficult; steam indirect drying has a stable effect and less pollutants, but the indirect drying efficiency is lower than direct drying; flue gas waste heat drying has a good effect, but it will increase the emission of polluting gases, thereby increasing the difficulty of pollution control during the drying process; mechanical filter pressing has less pollution, but the deep drying effect is not good, and it is generally appropriate to press the filter to a moisture content of 60%. In summary, the existing drying technologies all have certain shortcomings, and new sludge drying technologies need to be developed. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, an embodiment of the present invention provides a sludge drying device, which can improve the drying efficiency through two-stage drying and dehydration.

[0004] The embodiment of the present invention provides a sludge drying device, including an auger conveyor and a microwave heater, wherein the auger conveyor has a conveying cavity and a feed port and a discharge port connected to the conveying cavity, the upper end of the conveying cavity is sealed with a top cover, a main shaft arranged in a horizontal direction is arranged in the conveying cavity, a spiral blade is fixedly connected to the outer periphery of the main shaft, the main shaft includes a front section main shaft and a rear section main shaft, the spiral blade includes a front section blade and a rear section blade, the front section main shaft is fixedly connected to the rear section main shaft, the front section blade is fixedly connected to the rear section blade, the length of the front section main shaft is equal to the horizontal length of the front section blade, and the length of the rear section main shaft is equal to the horizontal length of the rear section main shaft. The horizontal lengths of the rear blades are equal, the feed port of the auger conveyor is located above the front blades near the head end, the discharge port of the auger conveyor is located below the tail end of the rear blades, the front main shaft and the front blades are made of metal, the rear main shaft and the rear blades are made of silicon carbide, and a gap is left between the lower end surface of the top cover and the upper end surface of the spiral blades; a plurality of microwave heaters are provided, the microwave heaters are fixedly connected to the top cover and extend into the gap between the top cover and the spiral blades to heat the sludge in the conveying cavity, and the microwave heaters are respectively arranged above the front blades and above the rear blades.

[0005] The present invention performs segmented drying and dehydration of sludge by arranging front blades and rear blades in the auger conveyor. The sludge is first preliminarily dried at the front blades to remove the main water content, and then enters the rear blades for deep drying to complete deep dehydration, which can improve the drying efficiency and the utilization rate of thermal energy. By selecting silicon carbide material for the rear spindle and the rear blades, on the one hand, the good wave absorption of silicon carbide can be used to deeply dry the sludge after preliminary drying, and on the other hand, the processing cost of the equipment can be reduced, which is easy to promote.

[0006] In some embodiments, the auger conveyor has an exhaust gas outlet, which is connected to the conveying chamber. The exhaust gas generated after the sludge is dried can be discharged in time through the exhaust gas outlet to prevent the exhaust gas discharged from the sludge from being adsorbed on the sludge again.

[0007] In some embodiments, the sludge drying device further comprises an induced draft fan having an air inlet and an air outlet, and the air inlet of the induced draft fan is connected to the exhaust gas outlet through a pipeline, so that the exhaust gas is quickly discharged from the conveying chamber.

[0008] In some embodiments, the exhaust gas outlet includes a first exhaust gas outlet and a second exhaust gas outlet, the first exhaust gas outlet is arranged above the front blade, and the second exhaust gas outlet is arranged above the rear blade. The exhaust gas outlets are arranged at the front blade and the rear blade respectively to prevent the exhaust gas generated in the front section from being adsorbed by the sludge in the rear section.

[0009] In some embodiments, the sludge drying device further comprises a gas adsorption device, which has an adsorption chamber and an air inlet, an air outlet, an adsorbent inlet and an adsorbent outlet connected to the adsorption chamber, the adsorption chamber is filled with adsorbent, the air outlet of the induced draft fan is connected to the air inlet of the gas adsorption device through a pipeline, the air inlet of the gas adsorption device is located at the bottom of the side wall of the gas adsorption device, the air outlet of the gas adsorption device is located at the top of the side wall of the gas adsorption device, and the air inlet and air outlet of the gas adsorption device are located on opposite sides of the gas adsorption device. By providing the gas adsorption device, the sludge odor can be prevented from directly polluting the atmosphere, and the moisture carried in the exhaust gas can also be adsorbed.

[0010] In some embodiments, the top cover is provided with an air supply port, which is connected to the conveying chamber. Since the exhaust air in the auger conveyor is extracted by the induced draft fan, and the conveying chamber is a sealed chamber, the air supply port can be provided to prevent negative pressure from being generated inside the auger conveyor and the dried sludge particles from being sucked into the induced draft fan, causing damage to the equipment.

[0011] In some embodiments, the gas outlet of the gas adsorption device is connected to the air supply port through a pipeline. The exhaust gas discharged by the induced draft fan can be reused after being adsorbed by the gas adsorption device, and the adsorbed dry gas can be used to supply air to the auger conveyor to avoid the problem of moisture adsorption on the sludge. In addition, a circulating airflow is formed in the auger conveyor. On the one hand, the circulating airflow is a hot airflow, which can promote the drying of the sludge, and on the other hand, it can promote the moisture generated during the sludge drying process to be discharged as soon as possible.

[0012] In some embodiments, a filter screen is detachably connected to the gas outlet of the gas adsorption device to prevent gas from carrying adsorbent particles and being discharged from the gas outlet.

[0013] In some embodiments, the front main shaft and the front blades are made of carbon steel, the front main shaft and the rear main shaft are welded and fixed, and the front blades and the rear blades are welded and fixed.

[0014] In some embodiments, the first exhaust gas outlet is connected to the first branch pipeline, the second exhaust gas outlet is connected to the second branch pipeline, the first branch pipeline and the second branch pipeline are connected to one end of the main pipeline through a three-way pipe fitting, the other end of the main pipeline is connected to the air inlet of the induced draft fan, the first branch pipeline is connected to a first hygrometer, and the second branch pipeline is connected to a second hygrometer. The hygrometer can be used to determine the sludge drying conditions of the front and rear sections of the auger conveyor, and the sludge drying time can be adjusted by adjusting the running speed of the auger conveyor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings.

[0016] in:

[0017] Figure 1 is a schematic structural diagram of a sludge drying device in an embodiment of the present invention;

[0018] Reference numerals:

[0019] 1-wet mud silo; 2-feeding port; 3-reducer; 4-front section main shaft; 5-front section blades; 6-auger conveyor; 7-rear section main shaft; 8-rear section blades; 9-discharge port; 10-dry mud silo; 11-gas adsorption device; 12-induced draft fan; 13-first hygrometer; 14-microwave heater; 15-first exhaust gas outlet; 16-second hygrometer; 17-second exhaust gas outlet; 18-top cover. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0021] The sludge drying device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, an embodiment of the present invention proposes a sludge drying device, including an auger conveyor 6 and a microwave heater 14, the auger conveyor 6 has a conveying cavity and a feed port 2 and a discharge port 9 connected to the conveying cavity, the upper end of the conveying cavity is sealed and connected with a top cover 18, a main shaft arranged in a horizontal direction is provided in the conveying cavity, the outer periphery of the main shaft is fixedly connected with a spiral blade, the main shaft includes a front section main shaft 4 and a rear section main shaft 7, the spiral blade includes a front section blade 5 and a rear section blade 8, the front section main shaft 4 is fixedly connected to the rear section main shaft 7, the front section blade 5 is fixedly connected to the rear section blade 8, the length of the front section main shaft 4 is equal to the horizontal length of the front section blade 5, the length of the rear section main shaft 7 is equal to the rear section blade 8 The horizontal lengths of the segment blades 8 are equal, the feed port 2 of the auger conveyor 6 is located above the front segment blade 5 near the head end, the discharge port 9 of the auger conveyor 6 is located below the tail end of the rear segment blade 8, the front segment main shaft 4 and the front segment blade 5 are made of metal, the rear segment main shaft 7 and the rear segment blade 8 are made of silicon carbide, and a gap is left between the lower end surface of the top cover 18 and the upper end surface of the spiral blade; a plurality of microwave heaters 14 are provided, the microwave heaters 14 are fixedly connected to the top cover 18 and extend into the gap between the top cover 18 and the spiral blade to heat the sludge in the conveying cavity, and the microwave heaters 14 are respectively arranged above the front segment blade 5 and above the rear segment blade 8.

[0023] The present invention performs segmented drying and dehydration of sludge by arranging front blades 5 and rear blades 8 in the auger conveyor 6. The sludge is first preliminarily dried at the front blades 5 to remove the main water content, and then enters the rear blades 8 for deep drying and deep dehydration, which can improve the drying efficiency and the utilization rate of thermal energy. By selecting silicon carbide material for processing the rear spindle 7 and the rear blades 8, on the one hand, the good wave absorption of silicon carbide can be used to deeply dry the preliminarily dried sludge, and on the other hand, the processing cost of the equipment can be reduced, which is easy to promote.

[0024] It can be understood that the front blade 5 uses microwaves to heat the sludge autonomously. When the moisture content of the sludge is high, the sludge body has a higher absorption rate. The sludge absorbs the main energy radiated by the microwave heater 14 to heat up, and the main water contained in the sludge evaporates and dissipates to complete the initial drying. After the initial drying, the absorption rate of the sludge body has decreased, and the sludge is relatively loose, while the silicon carbide material has a good absorption rate. Therefore, the main shaft and blades absorb heat to further heat the sludge to complete deep drying.

[0025] Furthermore, the auger conveyor 6 is arranged in the horizontal direction, the feed port 2 of the auger conveyor 6 is connected to the wet mud bin 1, the discharge port 9 of the auger conveyor 6 is connected to the dry mud bin 10, and control valves are provided at the feed port 2 and the discharge port 9 of the auger conveyor 6. After closing the control valves of the feed port 2 and the discharge port 9, the entire system of the auger conveyor 6 forms a sealed space to prevent the smell of the sludge from emanating outward.

[0026] Furthermore, the number of microwave heaters 14 provided can be determined according to the length of the auger conveyor 6, so as to evenly heat the sludge inside the auger conveyor 6. For example, two microwave heaters 14 are provided above the front blade 5, and two microwave heaters 14 are provided above the rear blade 8.

[0027] Furthermore, a gap is left between the lower end surface of the top cover 18 and the upper end surface of the spiral blade to prevent wear between the rotating blade and the top cover 18 or the microwave heater 14.

[0028] Furthermore, the horizontal length of the front blade 5 is equal to the horizontal length of the rear blade 8 .

[0029] Furthermore, the microwave emitting component of the microwave heater 14 extends into the gap between the top cover 18 and the spiral blade, and the microwave emitting direction of the microwave emitting component diverges and points toward the conveying cavity to perform microwave heating on the sludge.

[0030] Furthermore, the main shaft of the auger conveyor 6 is connected to the reducer 3, and the reducer 3 drives the main shaft and the blades to rotate in the vertical direction, and can control the rotation speed of the main shaft and the blades, thereby adjusting the speed of sludge conveying.

[0031] In some embodiments, the auger conveyor 6 has an exhaust gas outlet, which is connected to the conveying chamber. The exhaust gas generated after the sludge is dried can be discharged in time through the exhaust gas outlet to prevent the exhaust gas discharged from the sludge from being adsorbed on the sludge again.

[0032] Furthermore, the exhaust gas outlet is arranged on the top cover 18, which can prevent the exhaust gas outlet from being blocked by sludge. A control valve is connected to the pipeline connected to the exhaust gas outlet.

[0033] In some embodiments, the sludge drying device further comprises an induced draft fan 12, the induced draft fan 12 has an air inlet and an air outlet, and the air inlet of the induced draft fan 12 is connected to the exhaust gas outlet through a pipeline, so that the exhaust gas is quickly discharged from the conveying chamber.

[0034] In some embodiments, the exhaust gas outlet includes a first exhaust gas outlet 15 and a second exhaust gas outlet 17, wherein the first exhaust gas outlet 15 is disposed above the front blade 5, and the second exhaust gas outlet 17 is disposed above the rear blade 8. The exhaust gas outlets are disposed at the front blade 5 and the rear blade 8, respectively, to prevent the exhaust gas generated in the front section from being adsorbed on the sludge in the rear section.

[0035] Furthermore, the first exhaust gas outlet 15 is arranged above the front blade 5 and close to the junction of the front blade 5 and the rear blade 8, so as to intercept the moisture generated by the front dried sludge as much as possible. The second exhaust gas outlet 17 is arranged above the rear blade 8 and close to the discharge port 9 of the auger conveyor 6, so as to absorb the moisture generated by the rear dried sludge before the sludge is discharged, so as to prevent the deep dried sludge from being adsorbed by the exhaust gas again.

[0036] In some embodiments, the sludge drying device further includes a gas adsorption device 11, which has an adsorption chamber and an air inlet, an air outlet, an adsorbent inlet and an adsorbent outlet connected to the adsorption chamber, the adsorption chamber is filled with adsorbent, the air outlet of the induced draft fan 12 is connected to the air inlet of the gas adsorption device 11 through a pipeline, the air inlet of the gas adsorption device 11 is located at the bottom of the side wall of the gas adsorption device 11, the air outlet of the gas adsorption device 11 is located at the top of the side wall of the gas adsorption device 11, and the air inlet and air outlet of the gas adsorption device 11 are located on opposite sides of the gas adsorption device 11. By providing the gas adsorption device 11, it is possible to prevent the sludge odor from directly polluting the atmosphere, and it is also possible to adsorb the moisture carried in the exhaust gas.

[0037] Furthermore, the adsorbent may be activated carbon or molecular sieve, or a desiccant that can absorb moisture. After the adsorbent has been used for a period of time, the adsorbent that has been saturated with adsorption may be discharged from the adsorbent outlet, and new adsorbent may be introduced into the adsorption chamber from the adsorbent inlet. The adsorbent that has been saturated with adsorption may be reused by regeneration.

[0038] In some embodiments, an air supply port is provided on the top cover 18, and the air supply port is connected to the conveying chamber. Since the exhaust air in the auger conveyor 6 is extracted by the induced draft fan 12, and the conveying chamber is a sealed chamber, the air supply port can be provided to prevent the negative pressure inside the auger conveyor 6 from being generated and the dried sludge particles from being sucked into the induced draft fan 12, causing damage to the equipment.

[0039] In some embodiments, the gas outlet of the gas adsorption device 11 is connected to the gas supply port through a pipeline. The exhaust gas discharged by the induced draft fan 12 can be reused after being adsorbed by the gas adsorption device 11, and the adsorbed dry gas can be used to supply air to the auger conveyor 6, avoiding the problem of moisture adsorption on the sludge, and a circulating airflow is formed in the auger conveyor 6. On the one hand, the circulating airflow is a hot airflow, which can promote the drying of the sludge, and on the other hand, it can promote the moisture generated during the sludge drying process to be discharged as soon as possible.

[0040] In some embodiments, a filter screen is detachably connected to the gas outlet of the gas adsorption device 11 to prevent the gas from carrying adsorbent particles and being discharged from the gas outlet.

[0041] Furthermore, the filter screen can be replaced regularly to prevent clogging of the gas outlet of the gas adsorption device 11. The filter screen can be fixedly connected to the gas outlet by bolts.

[0042] In some embodiments, the front main shaft 4 and the front blades 5 are made of carbon steel, the front main shaft 4 and the rear main shaft 7 are welded and fixed, and the front blades 5 and the rear blades 8 are welded and fixed.

[0043] In some embodiments, the first exhaust gas outlet 15 is connected to the first branch pipeline, the second exhaust gas outlet 17 is connected to the second branch pipeline, the first branch pipeline and the second branch pipeline are connected to one end of the main pipeline through a three-way pipe fitting, and the other end of the main pipeline is connected to the air inlet of the induced draft fan 12. The first branch pipeline is connected to a first hygrometer 13 for measuring the humidity of the exhaust gas discharged from the front section; the second branch pipeline is connected to a second hygrometer 16 for measuring the humidity of the exhaust gas discharged from the rear section. The hygrometer can be used to determine the sludge drying conditions of the front section and the rear section of the auger conveyor 6, and then the sludge drying time can be adjusted by adjusting the running speed of the auger conveyor 6.

[0044] It should be noted that in the device of the present invention, a control valve is arranged at an appropriate position in each pipeline to control the on-off or flow rate of the pipeline, which is a conventional technical means and is not described in detail here and is not shown in the drawings. The dotted line in the figure represents the boundary between the front section and the rear section of the auger conveyor 6, which can also be understood as the welding position of the front section main shaft 4 and the rear section main shaft 7 and the front section blade 5 and the rear section blade 8.

[0045] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] In the present invention, the term "some embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments and features of the different embodiments described in this specification without contradiction.

[0050] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A sludge drying device, characterized in that: include: An auger conveyor, the auger conveyor has a conveying chamber and a feed port and a discharge port connected to the conveying chamber, the upper end of the conveying chamber is sealed with a top cover, a main shaft arranged in the horizontal direction is provided in the conveying chamber, a spiral blade is fixedly connected to the outer periphery of the main shaft, the main shaft includes a front section main shaft and a rear section main shaft, the spiral blade includes a front section blade and a rear section blade, the front section main shaft is fixedly connected to the rear section main shaft, the front section blade is fixedly connected to the rear section blade, the length of the front section main shaft is equal to the horizontal length of the front section blade, and the length of the rear section main shaft is equal to the horizontal length of the rear section blade. etc., the feed port of the auger conveyor is located above the front blade near the head end, the discharge port of the auger conveyor is located below the tail end of the rear blade, the front main shaft and the front blade are made of metal, the rear main shaft and the rear blade are made of silicon carbide, a gap is left between the lower end surface of the top cover and the upper end surface of the spiral blade, the auger conveyor has an exhaust gas outlet, the exhaust gas outlet is connected to the conveying cavity, the exhaust gas outlet includes a first exhaust gas outlet and a second exhaust gas outlet, the first exhaust gas outlet is arranged above the front blade, and the second exhaust gas outlet is arranged above the rear blade; A microwave heater is provided in plurality, and the microwave heater is fixedly connected to the top cover and extends into the gap between the top cover and the spiral blade to heat the sludge in the conveying cavity. The microwave heater is respectively arranged above the front blade and above the rear blade.

2. The sludge drying device according to claim 1, characterized in that: It also includes an induced draft fan, which has an air inlet and an air outlet, and the air inlet of the induced draft fan is connected to the exhaust gas outlet through a pipeline.

3. The sludge drying device according to claim 2, characterized in that: It also includes a gas adsorption device, which has an adsorption chamber and an air inlet, an air outlet, an adsorbent inlet and an adsorbent outlet connected to the adsorption chamber, the adsorption chamber is filled with adsorbent, the air outlet of the induced draft fan is connected to the air inlet of the gas adsorption device through a pipeline, the air inlet of the gas adsorption device is located at the bottom of the side wall of the gas adsorption device, the air outlet of the gas adsorption device is located at the top of the side wall of the gas adsorption device, and the air inlet and air outlet of the gas adsorption device are located on opposite sides of the gas adsorption device.

4. The sludge drying device according to claim 3, characterized in that: The top cover is provided with an air replenishing port, and the air replenishing port is communicated with the conveying cavity.

5. The sludge drying device according to claim 4, characterized in that: The gas outlet of the gas adsorption device is connected to the gas supply port through a pipeline.

6. The sludge drying device according to claim 3, characterized in that: The gas outlet of the gas adsorption device is detachably connected with a filter screen.

7. The sludge drying device according to any one of claims 1 to 6, characterized in that: The front section main shaft and the front section blades are made of carbon steel. The front section main shaft and the rear section main shaft are welded and fixed, and the front section blades and the rear section blades are welded and fixed.

8. The sludge drying device according to claim 2, characterized in that: The first exhaust gas outlet is connected to a first branch pipeline, the second exhaust gas outlet is connected to a second branch pipeline, the first branch pipeline and the second branch pipeline are connected to one end of a main pipeline through a three-way pipe fitting, the other end of the main pipeline is connected to the air inlet of the induced draft fan, the first branch pipeline is connected to a first hygrometer, and the second branch pipeline is connected to a second hygrometer.

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