Efficient air path circulating system of split type low-temperature drying equipment and air control method

Abstract

The invention discloses a split type low-temperature drying equipment efficient air path circulating system and an air control method, and relates to the technical field of sludge low-temperature drying, the split type low-temperature drying equipment efficient air path circulating system comprises a warehouse body, a heat source center and a dust remover, the bottom of the warehouse body is connected with a dehumidification fan and a heating fan through air pipes, and a heating air outlet and a dehumidification air outlet are formed in the top of the warehouse body; a condenser is arranged at the position of the heating air outlet and connected with a heating fan through a pipeline, a heat source center is arranged outside the warehouse body and connected with a dehumidification fan and the warehouse body through pipelines, and a dust remover is arranged on the pipeline where the dehumidification air outlet is connected with the heat source center. According to the system, redundant dust in dehumidification air can be removed, the situation that the air resistance of the system is increased due to dust attachment is avoided, stable operation of the system is guaranteed, meanwhile, the dew point temperature and the moisture content of the dehumidification air are increased, the dehydration difficulty is lowered, the dehydration amount is increased, and system energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge low-temperature drying, and specifically relates to an efficient air duct circulation system and air control method for a split-type low-temperature drying equipment. Background Art

[0002] Most of the common sludge low-temperature drying equipment on the market at present is of an integrated structure. The heat source center and the storage body are separated by a middle partition. The system return air is divided into dehumidified air and heating air. Among them, the dehumidified air is sent to the bottom of the storage body by a dehumidifying fan arranged at the position of the partition connected to the heat source center under the lowest-layer chain mesh of the storage body, and then sequentially passes through each layer of chain mesh and sludge layer from bottom to top to heat and dry the sludge. The heating air enters the storage body horizontally from the side by a heating fan in the middle of the storage body partition of the storage body, mixes with the dehumidified air coming from below, continues to move upward through the remaining chain mesh and sludge layer, and finally enters the heat source center through a filter, and then the air is divided. One part passes through the evaporator for dehumidification and then is heated by the condenser, and is sent back to the bottom of the storage body by the dehumidifying fan again. The other part is directly heated by the condenser and sent into the storage body from the middle-layer chain mesh of the storage body, and so on in a cycle.

[0003] The above-mentioned structure has the following disadvantages:

[0004] First, after the dehumidified air enters the storage body from one side, it is blocked by the inner wall of the storage body and diffuses disorderly. In this way, the wind speed distribution at each position on the chain mesh plane is uneven, which is not conducive to the full utilization of heat energy. There will be local high wind speeds, resulting in the generation of a large amount of dust. And the integrated structure is compact, with little space reserved for dust cleaning, and there are relatively few dust removal measures that can be taken, which is not conducive to the cleaning of dust in the dehumidified air, and is likely to cause blockage and corrosion of the evaporator, affecting the service life.

[0005] Second, the heating air enters from the side of the middle-layer chain mesh of the storage body, which will cause the wind speed at the position of the fan outlet to be too high, forming dust, and is not conducive to the uniformity of the wind speed distribution at each position on the upper-layer chain mesh. And the number of layers for upward drying is small, which is not conducive to the release of heat in the heating air, with low energy utilization rate, resulting in a relatively low moisture content of the return air entering the heat source center, which is not conducive to the dehumidification and dehydration of the dehumidified air. Summary of the Invention

[0006] Aiming at the problems of a large amount of dust easily appearing in the storage body and the relatively low moisture content of the dehumidified air returning to the heat source center in the prior art, the present invention provides an efficient air duct circulation system and air control method for a split-type low-temperature drying equipment, which can remove the excess dust in the dehumidified air, avoid the increase of system air resistance caused by the adhesion of dust, ensure the stable operation of the system, and at the same time improve the dew point temperature and moisture content of the dehumidified air, reduce the dehydration difficulty, increase the dewatering amount, and save the system energy consumption.

[0007] To achieve the above object, the present invention can adopt the following technical solutions:

[0008] In a first aspect, the present invention provides an efficient air duct circulation system for a split-type low-temperature drying equipment, which includes:

[0009] A library body, the bottom of which is respectively connected with a dehumidifying fan and a heating fan through air ducts. The top of the library body is provided with a heating air outlet and a dehumidifying air outlet. A condenser is arranged at the heating air outlet, and the condenser is connected with the heating fan through a pipeline;

[0010] A heat source center, which is arranged outside the library body, and the heat source center is connected with the dehumidifying fan and the library body through pipelines;

[0011] A dust collector, which is arranged on the pipeline connecting the dehumidifying air outlet and the heat source center;

[0012] Wherein, the dehumidifying air generated by the dehumidifying fan flows in the library body and flows out from the dehumidifying air outlet, then enters the dust collector for dust removal, and then undergoes dehumidification and dehydration through the heat source center, and finally enters the library body again to flow and realize circulation;

[0013] The heating air generated by the heating fan is used to repeatedly heat the dehumidifying air that has circulated multiple times, increasing the ability of the dehumidifying air to absorb moisture, so as to increase the moisture content and dew point temperature of the dehumidifying air when it finally leaves the library body.

[0014] For the efficient air duct circulation system of the split-type low-temperature drying equipment as described above, further, a distributor for releasing sludge is connected to the feeding port of the library body, and a conveying assembly is arranged in the library body. The conveying assembly is respectively connected with the discharge port of the distributor and the discharge port of the library body;

[0015] Wherein, the conveying assembly is arranged above the dehumidifying fan and the heating fan and below the condenser, so that the sludge is dried and dehydrated by the dehumidifying air and the heating air during the conveying process.

[0016] For the efficient air duct circulation system of the split-type low-temperature drying equipment as described above, further, the conveying assembly includes a plurality of transmission chain nets arranged from top to bottom. The uppermost transmission chain net is arranged below the discharge port of the distributor. The moving directions of adjacent transmission chain nets are opposite, and the heads and tails of adjacent transmission chain nets are staggered to receive and convey the sludge. The lowermost transmission chain net is arranged above the discharge port of the library body.

[0017] For the efficient air duct circulation system of the split-type low-temperature drying equipment as described above, further, a partition baffle is arranged at the bottom of the library body. The two ends of the partition baffle are respectively connected with the bottom wall of the library body and the lower surface of the lowermost transmission chain net, thereby dividing the bottom of the library body into multiple regions, and each region is provided with an air inlet.

[0018] For the high-efficiency air duct circulation system of the split-type low-temperature drying equipment as described above, further, a plurality of the diffuser plates are arranged inside the bottom of the library body, and a plurality of the diffuser plates are close to the air outlet pipe of the dehumidification fan and are arranged to incline upward at a preset first angle. A plurality of the diffuser plates are distributed at a preset first spacing, and a preset second spacing is satisfied between the higher end of the uppermost diffuser plate and the lowermost transmission chain net.

[0019] For the high-efficiency air duct circulation system of the split-type low-temperature drying equipment as described above, further, a drainage plate is arranged inside the bottom of the library body. The drainage plate is arranged close to the air outlet pipe of the heating fan. The drainage plate includes a drainage inclined plate and a drainage flat plate. The lower end of the drainage inclined plate is connected to the bottom of the library body. The drainage inclined plate is arranged to incline upward at a preset second angle. A preset third spacing is satisfied between the lower end of the drainage inclined plate and the air inlet of the library body. The drainage flat plate is arranged horizontally and one end of the drainage flat plate is connected to the higher end of the drainage inclined plate. A preset fourth spacing is satisfied between the drainage flat plate and the lowermost transmission chain net. A preset fifth spacing is satisfied between the other end of the drainage flat plate and the wall surface opposite to the air inlet of the library body.

[0020] For the high-efficiency air duct circulation system of the split-type low-temperature drying equipment as described above, further, a filter is further included, and the filter is arranged between the condenser and the conveying component.

[0021] For the high-efficiency air duct circulation system of the split-type low-temperature drying equipment as described above, further, wind baffle plates are installed on both sides of the transmission chain net.

[0022] For the high-efficiency air duct circulation system of the split-type low-temperature drying equipment as described above, further, the shape of the air outlet pipe of the heating fan is trapezoidal.

[0023] In a second aspect, the present invention provides a high-efficiency air duct circulation air control method for a split-type low-temperature drying equipment, based on the high-efficiency air duct circulation system of the split-type low-temperature drying equipment as described above, and it includes the following steps:

[0024] Step 1: Model the library body through computer-aided software to obtain a three-dimensional model of the library body;

[0025] Step 2: Adjust the positions of the diffuser plates, the drainage plate and the air inlets and outlets of the library body in the three-dimensional model of the library body to obtain the movement trajectory of the air field inside the library body;

[0026] Step 3: According to the obtained movement trajectory of the air field inside the library body, confirm the moisture content and dew point temperature of the actual circulating fan each time it blows air, and ensure that as the dehumidified air circulates in the library body, its moisture content and dew point temperature have an increasing effect;

[0027] Step 4: Determine the specification design of the diffuser plate and the drainage plate according to the moisture content of the dehumidified air finally leaving the library body; when the moisture content of the dehumidified air finally leaving the library body reaches the maximum value, the specification design of the diffuser plate and the drainage plate is the optimal at this time.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. The present invention adopts a split structure and connects the heat source center and the library body through an air duct, so that the heating air and the dehumidified air can be separately fed into the library body from different sides in different media, which is conducive to the precise control of the distribution of the circulating air after entering the library body. At the same time, an efficient dust collector can be added between the library body and the heat source center to improve the removal rate of dust in the dehumidified air, extend the stability and service life of the evaporator heat exchange, reduce the maintenance frequency. At the same time, the split structure has sufficient maintenance space, which is convenient for equipment maintenance;

[0030] 2. The present invention uses CFD wind field simulation to simulate the movement trajectories of the heating air and the dehumidified air, and reasonably distributes the air volumes of the dehumidified air and the heating air. An innovative stepped return air duct design is adopted in the air path circulation structure, so that the dehumidified air and the heating air are in a series relationship, greatly improving the heat conversion efficiency, increasing the moisture content and dew point temperature of the return air when leaving the library body, facilitating a large amount of dehydration at a relatively high cooling temperature in the heat source center, improving the energy utilization rate of the equipment, and achieving the purpose of high efficiency and energy saving of the equipment. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic structural diagram of the high-efficiency air path system of the split-type low-temperature drying equipment according to the embodiment of the present invention (the dotted line represents the invisible position on the back of the library body);

[0033] Figure 2 It is a layout diagram of the diffuser plate according to the embodiment of the present invention;

[0034] Figure 3 It is a layout diagram of the drainage plate according to the embodiment of the present invention;

[0035] Figure 4 It is a three-dimensional model mesh division diagram of the library body according to the embodiment of the present invention;

[0036] Figure 5 It is a movement trajectory diagram of the air field in the library body according to the embodiment of the present invention;

[0037] Wherein: 1. Heat source center; 2. Distributor; 3. Library body; 4. Dehumidification circulating air; 5. Dehumidification fan; 6. Outlet duct of the dehumidification fan; 7. Bottom space of the library body; 8. First heating air; 9. Partition baffle; 10. First heating fan; 11. Second heating air; 12. Second heating fan; 13. Outlet duct of the heating fan; 14. Discharge port of the library body; 15. Transmission chain net; 16. Sludge; 17. Wind baffle; 18. Filter; 19. Dehumidified air outlet; 20. Diffuser plate; 21. Drainage inclined plate; 22. Drainage flat plate; 23. Dust settling area; 24. Outlet of the first heating air; 25. Outlet of the second heating air; 26. First condenser; 27. Second condenser; 28. Dust collector. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0039] Embodiment:

[0040] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" in the embodiments of the present invention and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, component, product, or device that includes a series of steps or devices does not necessarily have to be limited to those steps or devices clearly listed, but may include other steps or devices not clearly listed or inherent to these processes, methods, products, or devices.

[0041] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0042] In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined. In addition, unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected to" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0044] In a first aspect, the present invention provides a high-efficiency air duct circulation system for a split-type low-temperature drying equipment, which includes a storage body 3, a heat source center 1, and a dust collector 28. The bottom of the storage body 3 is respectively connected with a dehumidifying fan and a heating fan through air ducts. The top of the storage body 3 is provided with a heating air outlet and a dehumidifying air outlet. A condenser is arranged at the heating air outlet, and the condenser is connected with the heating fan through a pipeline. The heat source center 1 is arranged outside the storage body 3, and the heat source center 1 is connected with the dehumidifying fan and the storage body through pipelines. The dust collector 28 is arranged on the pipeline connecting the dehumidifying air outlet 19 and the heat source center 1; wherein, the dehumidifying air generated by the dehumidifying fan flows in the storage body 3 and flows out from the dehumidifying air outlet 19, then enters the dust collector 28 for dust removal, and then undergoes dehumidification and dehydration through the heat source center 1, and finally enters the storage body 3 again to flow and realize circulation; the heating air generated by the heating fan is used to repeatedly heat the dehumidifying air that has circulated multiple times, increasing the ability of the dehumidifying air to absorb moisture, so as to increase the moisture content and dew point temperature of the dehumidifying air when it finally leaves the storage body 3.

[0045] Specifically, the high-efficiency air duct circulation system of this low-temperature drying equipment adopts a split structure, dividing the heat source center 1 and the library body 3 into two parts and connecting them through air ducts. This allows the heating air and dehumidifying air to be separately introduced from different sides of the library body 3, facilitating the precise control of the circulating air distribution after entering the library body 3. At the same time, the split structure provides sufficient maintenance space, making it convenient to maintain the equipment. Additionally, a dust collector 28 is added in the connecting pipe between the library body 3 and the heat source center 1 to improve the removal rate of dust in the dehumidifying air, extend the stability and lifespan of the evaporator heat exchange, and reduce the maintenance frequency. Furthermore, heating air outlets are provided at the top of the library body 3, specifically two, namely the first heating air outlet 24 and the second heating air outlet 25. Condensers are installed at both heating air outlets, namely the first condenser 26 and the second condenser 27. The two condensers are used to heat the air discharged from the library body 3, thereby obtaining dehumidifying air with a high dew point and high moisture content. When this dehumidifying air enters the heat source center 1, due to its relatively high dew point temperature and moisture content, the water removal capacity is greater than that of ordinary dehumidifying air, with more water removed and higher energy efficiency, saving system energy.

[0046] As an alternative implementation, in some embodiments, a distributor for releasing sludge is connected to the feed inlet of the library body 3, and a conveying assembly is arranged inside the library body 3. The conveying assembly is respectively connected to the discharge outlet of the distributor 2 and the discharge outlet of the library body 3. Among them, the conveying assembly is arranged above the dehumidifying fan and the heating fan and below the condenser, so that the sludge 16 is dried and dehydrated by the dehumidifying air and the heating air during the conveying process. Further, the conveying assembly includes a plurality of transmission chain meshes 15 arranged from top to bottom. The uppermost transmission chain mesh 15 is arranged below the discharge outlet of the distributor 2. The moving directions of adjacent transmission chain meshes 15 are opposite, and the heads and tails of adjacent transmission chain meshes 15 are staggered to receive and convey the sludge 16. The lowermost transmission chain mesh 15 is arranged above the discharge outlet of the library body 3. Further, a partition baffle 9 is arranged at the bottom of the library body 3. Both ends of the partition baffle 9 are respectively connected to the bottom wall of the library body 3 and the lower surface of the lowermost transmission chain mesh 15, thereby dividing the bottom of the library body 3 into multiple regions, and each region is provided with an air inlet. Even further, a filter 18 is also included, and the filter 18 is arranged between the condenser and the conveying assembly.

[0047] Specifically, referring again to Figure 1When the high-efficiency air duct system of this split-type low-temperature drying equipment operates, the sludge 16 falls down after being cut into strips by the distributor 2 and is spread flat on the topmost transmission chain net 15. The transmission chain nets 15 are horizontally arranged in multiple layers from top to bottom in the library body 1 and move horizontally driven by a motor. The sludge 16 also falls to the next layer at the end of each layer of the transmission chain net 15 and finally falls out of the discharge port of the library body 3 from the bottommost transmission chain net 15. During this process, the heated circulating air enters from the bottom of the library body 3, passes upward through the gaps between each layer of the transmission chain net 15 and the sludge layer in turn, dries the wet sludge, takes away the moisture in the sludge, and then passes through the filter 18 upward and is discharged from the library body 3 after filtration.

[0048] In addition, the above-mentioned circulating air is divided into two types, namely dehumidifying air and heating air. Among them, the heating air is further divided into two streams, namely the first heating air 8 and the second heating air 11. The first heating air 8 mainly conducts the first heating on the dehumidifying air after passing through the transmission chain net 15 and the sludge 16, and the second heating air 11 further heats the first heating air 8 after passing through the transmission chain net 15 and the sludge 16, and obtains dehumidifying air with a high dew point and high moisture content through secondary heating. The bottom space 7 of the library body is divided into three areas by the partition baffle 9, and each area corresponds to an air inlet. From left to right, they are the dehumidifying air inlet (corresponding to the dehumidifying air blower 5), the first heating air inlet (corresponding to the first heating air blower 10), and the second heating air inlet (corresponding to the second heating air blower 12). The space of each area is divided according to the air volume ratio of each stream of air. In this way, it can be ensured that each stream of air entering the library body 3 will not be mixed, and the average wind speed of each stream of air passing through the transmission chain net 15 is similar, avoiding the formation of local high wind speed areas, reducing the generation of dust caused by the crushing of dry mud particles, and ensuring good uniformity of the circulating air passing through the sludge.

[0049] The dehumidifying air 4 is sent out after being dehydrated and heated by the heat source center 1, and is sent into the bottom of the library body 3 from one end of the library body 3 by using the dehumidifying air blower 5. Then it passes upward through the transmission chain net 15 and the sludge layer, dries the sludge, takes away the moisture, and finally passes through the filter 18 and is discharged from the outlet of the library body 3 above the filter 18. The heating air passes through the condenser and is heated on both sides of the upper space of the filter 18 at the top of the library body 3 respectively, and then is sent into the bottom of the library body 3 by the heating air blower. Similarly, then it also passes upward through multiple layers of the transmission chain net 15 and the sludge layer to dry the sludge. Among them, the air inlets of the first heating air blower 10 and the second heating air blower 12 are staggered and respectively arranged at the middle positions of their respective areas.

[0050] As an alternative embodiment, in some embodiments, a plurality of diffuser plates 20 are provided inside the bottom of the library body 3. The plurality of diffuser plates 20 are close to the air outlet pipe 6 of the dehumidification fan and are arranged to slope upward at a preset first angle. The plurality of diffuser plates 20 are distributed at a preset first spacing, and the higher end of the uppermost diffuser plate 20 and the lowermost transmission chain mesh 15 satisfy a preset second spacing. Further, a drainage plate is provided inside the bottom of the library body 3. The drainage plate is close to the air outlet pipe 13 of the heating fan. The drainage plate includes a drainage inclined plate 21 and a drainage flat plate 22. The lower end of the drainage inclined plate 21 is connected to the bottom of the library body 3. The drainage inclined plate 21 is arranged to slope upward at a preset second angle. The lower end of the drainage inclined plate 21 and the air inlet of the library body 3 satisfy a preset third spacing. The drainage flat plate 22 is horizontally arranged and one end of the drainage flat plate 22 is connected to the higher end of the drainage inclined plate 21. The drainage flat plate 22 and the lowermost transmission chain mesh 15 satisfy a preset fourth spacing. The other end of the drainage flat plate 22 and the wall surface opposite to the air inlet of the library body 3 satisfy a preset fifth spacing.

[0051] Specifically, referring to Figure 2 , a diffuser plate 20 is provided at the position where the air outlet pipe 6 of the dehumidification fan and the lower part of the wind baffle 17 are staggered to guide and diffusely spread the dehumidified air 4, so that the dehumidified air 4 can enter the bottom of the library body 3 in an obliquely upward direction after passing through the diffuser plate 20, ensuring that the dehumidified air can be evenly distributed to each position of the transmission chain mesh 15 in the direction from the air inlet to the partition baffle 9 and drying the sludge upward through the transmission chain mesh 15 and the sludge layer. Among them, the diffuser plate 20 is a combination of strip-shaped sheet metal parts stacked in multiple layers up and down. Each diffuser plate 20 is arranged to slope upward at a first angle α, and the adjacent diffuser plates 20 are distributed at a first spacing d1. The higher end of the uppermost diffuser plate 20 and the lowermost transmission chain mesh 15 are spaced at a second spacing d2. The parameters of the first angle α, the first spacing d1, and the second spacing d2 need to ensure that the wind speed of the dehumidified air is evenly distributed when passing through the lowermost transmission chain mesh 15.

[0052] Referring to Figure 3, a diversion plate is installed at a certain distance directly below the conveying chain net 15 behind the air inlet of the heating air. The diversion plate is divided into a diversion inclined plate 21 and a diversion flat plate 22. The diversion inclined plate 21 can further increase the inclination angle obliquely upward for the air whose direction has been initially changed by the diffuser plate 20. At the same time, the diversion flat plate 22 can divert the obliquely upward air horizontally in all directions when blocked by the conveying chain net 15, so that the heating air can be evenly distributed to each position of the conveying chain net 15, realizing uniform horizontal paving and uniform upward passing through the conveying chain net 15 and the sludge layer in a relatively short distance, and avoiding excessive wind speed of the conveying chain net 15 near the wall surface due to the short distance from the air inlet to the opposite wall surface, thereby affecting the wind speed uniformity. Among them, the diversion plate longitudinally penetrates the space corresponding to the conveying chain net 15 below the single-strand heating air. The lower end of the diversion inclined plate 21 is spaced from the air outlet pipe 13 of the heating fan by a third distance d3. The diversion inclined plate is inclined upward at a second angle β. The diversion flat plate 22 is spaced from the lowermost conveying chain net 15 by a fourth distance d4. The end of the diversion flat plate 22 is spaced from the wall surface of the storage body 3 opposite to the air inlet by a fifth distance d5. The parameters of the second angle β, the third distance d3, the fourth distance d4, and the fifth distance d5 need to ensure uniform distribution of the wind speed when the heating air passes through the lowermost conveying chain net 15. In addition, since there is a certain distance between the end of the diversion flat plate 22 and the wall surface of the storage body 3 opposite to the air inlet, a low wind speed vortex area can be formed below the diversion plate, serving as a dust settling area 23, thereby facilitating subsequent cleaning of the dust.

[0053] In a certain embodiment, the leeward surface of the lowermost conveying chain net is set as the monitoring surface. At this time, the standard deviation of the average wind speed of the monitoring surface is calculated through a preset formula, and then combined with the velocity cloud map of the monitoring surface, it can be determined that when the first angle α = 45°, the second angle β = 45°, the first distance d1 = 200 mm, the second distance d2 = 350 mm, the third distance d3 = 250 mm, the fourth distance d4 = 300 mm, and the fifth distance d5 = 300 mm, the standard deviation of the average wind speed of the monitoring surface is 14.5% (<17%), which is within the control range.

[0054] As an alternative implementation manner, in some embodiments, wind baffle plates 17 may also be installed on both sides of each layer of the conveying chain net 15, so that the circulating air can be prevented from being discharged from the feed inlet or the discharge outlet of the storage body 3.

[0055] As an alternative implementation manner, in some embodiments, the shape of the air outlet pipe 13 of the heating fan is trapezoidal. Among them, since the air outlet of the heating fan is rectangular and has a small cross-sectional area and is not easy to spread after entering the storage body 3, the air outlet pipe 13 of the heating fan between the air outlet of the heating fan and the storage body 3 is set as trapezoidal, which is convenient for the initial diffusion of the air outlet of the heating fan and prepares for further diffusion and wind direction change by the diversion plate.

[0056] In a second aspect, the present invention provides an efficient air path circulation air control method for a split-type low-temperature drying equipment. Based on the above-mentioned efficient air path circulation system of the split-type low-temperature drying equipment, it specifically includes the following steps:

[0057] Step 1: Use computer-aided software to model the library body to obtain a three-dimensional model of the library body; Step 2: Adjust the positions of the diffuser plate, the drainage plate, and the inlet and outlet air vents of the library body in the three-dimensional model of the library body to obtain the movement trajectory of the air field in the library body; Step 3: According to the obtained movement trajectory of the air field in the library body, confirm the moisture content and dew point temperature of the actual circulating fan's air output each time, ensuring that as the dehumidified air circulates in the library body, its moisture content and dew point temperature show an increasing effect; Step 4: Determine the specification design of the diffuser plate and the drainage plate according to the moisture content of the dehumidified air finally leaving the library body; when the moisture content of the dehumidified air finally leaving the library body reaches the maximum value, the specification design of the diffuser plate and the drainage plate is the optimal at this time.

[0058] Specifically, first, operations such as combining, splitting, naming, and sharing coincident topologies need to be performed on the model air field in Spaceclaim. The model includes the dehumidified air inlet, the heated air inlet, the bottom space of the library body, the combination of the transmission chain network and the sludge layer, etc. Then, import the model with shared coincident topologies into Ansys Mesh for mesh generation. For the positions where the flow fields of the diffuser plate, the drainage plate, and the end baffle of the transmission chain network are relatively complex, the meshes are refined (see Figure 4 ). Import the meshed model into Fluent. In the settings panel, select Double Precision, set the SolverProcesses of the solver process to 6, check the quality of the model mesh imported into Fluent and perform unit conversion. Select the κ-ε turbulence model to calculate the turbulent motion process in the model flow field. Set air as the moving medium of the flow field, set the three air inlets as mass inlets, the outlet as a pressure outlet, and the wall as a no-slip surface boundary condition. Input the mass flow rate of the air volume of each air inlet in g / s, analyze the CFD simulation results, and output the movement trajectories of the air inlet and outlet of the air field (see Figure 5 ). Collect and compare the humidity and dew point temperature data of the system's circulating air outlet, and verify its effect, so as to finally determine the size specifications of the diffuser plate and the drainage plate.

[0059] The movement trajectory of the air field in the library body is preferably a step-by-step type. The following are the data when the system is running normally:

[0060] The moisture content of the dry air after the dehumidified air passes through the transmission chain network and sludge for the first time is 46.19 g / kg, and the dew point temperature is 39.03 °C. The moisture content of the dry air after the first heating air passes through the transmission chain network and sludge is 51.62 g / kg, and the dew point temperature is 40.96 °C. The moisture content of the dry air after the second heating air passes through the transmission chain network and sludge (i.e., the dehumidified air before entering the heat source center) is 56.04 g / kg, and the dew point temperature is 42.4 °C.

[0061] The dehumidified air before entering the heat source center has a moisture content increase of 21.3% compared to when the dehumidified air first passes through the transmission chain network and sludge, and the dew point temperature increases by 3.37 °C. From the above data, it can be found that the dew point temperature increases significantly and the moisture content increases significantly. In this way, the dehydration difficulty of the dehumidified air in the heat source center can be greatly reduced, the dehydration amount can be increased, and the system energy consumption can be saved.

[0062] Therefore, this system has an obvious effect on increasing the dew point temperature and moisture content of the dehumidified air, and is of great significance for improving the dehumidification effect and stability of the equipment.

[0063] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0064] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the essence of the content of the present invention should be covered by the protection scope of the present invention.

Claims

1. An efficient air duct circulation system for a split-type low-temperature drying equipment, characterized in that include: The bottom of the storage body is connected to a dehumidifying fan and a heating fan through air ducts, and the top of the storage body is provided with a heating air outlet and a dehumidifying air outlet. A condenser is arranged at the heating air outlet, and the condenser is connected to the heating fan through a pipeline; A heat source center is arranged outside the storage body, and the heat source center is connected to the dehumidification fan and the storage body through a pipeline; A dust collector, which is arranged on a pipeline connecting the dehumidification air outlet and the heat source center; The dehumidified air generated by the dehumidification fan flows in the storage body and flows out from the dehumidified air outlet, then enters the dust collector for dust removal, then passes through the heat source center for dehumidification and dehydration, and finally enters the storage body for circulation; The heated air generated by the heating fan is used to repeatedly heat the dehumidified air that has been circulated for multiple times, thereby increasing the dehumidified air's ability to absorb moisture, so as to increase the moisture content and dew point temperature of the dehumidified air when it finally leaves the storage body.

2. The high-efficiency air duct circulation system of the split-type low-temperature drying equipment according to claim 1, characterized in that, The feed inlet of the storage body is connected to a distributor for releasing sludge, and a conveying component is arranged in the storage body, and the conveying component is respectively connected to the discharge port of the distributor and the discharge port of the storage body; The conveying assembly is arranged above the dehumidifying fan and the heating fan and below the condenser, so that the sludge is dried and dehydrated by the dehumidifying air and the heating air during the conveying process.

3. The high-efficiency air duct circulation system of the split low-temperature drying equipment according to claim 2, characterized in that, The conveying assembly includes a plurality of conveying chain nets arranged from top to bottom, the top conveying chain net is arranged below the discharge port of the distributor, the movement directions of adjacent conveying chain nets are opposite and the head ends and tail ends of adjacent conveying chain nets are staggered to receive and convey sludge, and the bottom conveying chain net is arranged above the discharge port of the storage body.

4. The high-efficiency air duct circulation system of the split-type low-temperature drying equipment according to claim 3, characterized in that, A partition baffle is provided at the bottom of the storage body, and two ends of the partition baffle are respectively connected to the bottom wall of the storage body and the lower surface of the lowest transmission chain network, so as to divide the bottom of the storage body into multiple areas, and each area is provided with an air inlet.

5. The high-efficiency air duct circulation system of the split low-temperature drying equipment according to claim 3, characterized in that A plurality of diffuser plates are arranged at the bottom of the storage body, and the diffuser plates are close to the air outlet pipe of the dehumidification fan and are inclined upward at a preset first angle. The diffuser plates are distributed at a preset first spacing, and a preset second spacing is satisfied between the higher end of the top diffuser plate and the bottom transmission chain network.

6. The precise air control structure for the body of the split low-temperature drying equipment according to claim 5, characterized in that The guide plate is arranged at the bottom of the storage body, and the guide plate is arranged close to the air outlet pipe of the heating fan. The guide plate includes a guide inclined plate and a guide flat plate. The lower end of the guide inclined plate is connected to the bottom of the storage body, and the guide inclined plate is inclined upward at a preset second angle. The lower end of the guide inclined plate and the air inlet of the storage body meet a preset third distance. The guide flat plate is horizontally arranged and one end of the guide flat plate is connected to the higher end of the guide inclined plate. The guide flat plate and the lowermost transmission chain network meet a preset fourth distance, and the other end of the guide flat plate and the wall surface opposite to the air inlet of the storage body meet a preset fifth distance.

7. The high-efficiency air path circulation system of the split low-temperature drying equipment according to claim 2, characterized in that, Also included is a filter disposed between the condenser and the delivery assembly.

8. The high-efficiency air path circulation system of the split-type low-temperature drying equipment according to claim 3, characterized in that Wind shields are installed on both sides of the transmission chain network.

9. The high-efficiency air duct circulation system of the split low-temperature drying equipment according to claim 1, characterized in that The shape of the air outlet pipe of the heating fan is trapezoidal.

10. An efficient air path circulation air control method for a split-type low-temperature drying equipment, based on the efficient air path circulation system of the split-type low-temperature drying equipment according to any one of claims 1 to 9, which includes the following steps: Step 1: Model the library body through computer-aided software to obtain a three-dimensional model of the library body; Step 2: Adjust the positions of the diffuser plate, the diversion plate, and the inlet and outlet air openings of the library body in the three-dimensional model of the library body to obtain the movement trajectory of the air field in the library body; Step 3: According to the obtained movement trajectory of the air field in the library body, confirm the moisture content and dew point temperature of the air discharged by the actual circulation fan each time, ensuring that as the dehumidified air circulates in the library body, its moisture content and dew point temperature show an increasing effect; Step 4: Determine the specification design of the diffuser plate and the diversion plate according to the moisture content of the dehumidified air finally leaving the library body; when the moisture content of the dehumidified air finally leaving the library body reaches the maximum value, the specification design of the diffuser plate and the diversion plate is the optimal at this time.

Images