阅读说明：本技术 一种热交换装置 (Heat exchange device ) 是由 蒋红光 毕永伟 肖波 易洋 杨治清 夏茂川 于 2021-11-11 设计创作，主要内容包括：本发明提供了一种热交换装置,目的是解决现有技术中通过热交换形式进行烘干时存在风机的能耗大的问题,提供一种热交换装置。该装置包括：烘干箱和设置在烘干箱内的隔板,烘干箱内分隔为烘干区和风循环处理区,所述隔板上设有上风循环口、中层风循环口和下风循环口；第一输送网带；第二输送网带；第三输送网带；上风循环机构及下风循环机构；其中,上风循环机构与第一输送网带之间形成上风循环,下风循环机构与第二输送网带和第三输送网带之间形成下风循环,上风循环与下风循环在对应中层风循环口处形成对流区。本发明通过中间回风减少下层风循环阻力,进而减少风机功率,达到节约能耗的问题。(The invention provides a heat exchange device, aims to solve the problem that a fan is high in energy consumption when drying is carried out in a heat exchange mode in the prior art, and provides the heat exchange device. The device includes: the drying box is internally divided into a drying area and an air circulation treatment area, and an upper air circulation opening, a middle air circulation opening and a lower air circulation opening are formed in the partition plate; a first conveying mesh belt; a second conveying mesh belt; a third conveying mesh belt; an upper wind circulation mechanism and a lower wind circulation mechanism; and the upper air circulation mechanism and the first conveying mesh belt form upper air circulation, the lower air circulation mechanism and the second conveying mesh belt and the third conveying mesh belt form lower air circulation, and the upper air circulation and the lower air circulation form a convection area at the position corresponding to the middle layer air circulation opening. According to the invention, the lower layer wind circulation resistance is reduced through intermediate return air, so that the power of the fan is reduced, and the problem of energy consumption saving is achieved.)

1. A heat exchange apparatus, comprising:

a drying box;

the partition board is arranged in the drying box and divides the interior of the drying box into a drying area and an air circulation treatment area, and an upper air circulation opening, a middle air circulation opening and a lower air circulation opening which are used for communicating the drying area and the air circulation treatment area are formed in the partition board;

the first conveying mesh belt is arranged in the drying area and is positioned below the upper air circulation port;

the second conveying mesh belt is arranged in the drying area and is positioned above the downwind circulation port;

the third conveying mesh belt is arranged in the drying area and is positioned between the second conveying mesh belt and the middle layer air circulation opening;

the upper air circulating mechanism is arranged in the air circulating treatment area and is positioned at the upper air circulating opening; and

the downwind circulating mechanism is arranged in the wind circulating treatment area and is positioned at the downwind circulating port;

and an upper air circulation is formed between the upper air circulation mechanism and the first conveying mesh belt, a lower air circulation is formed between the lower air circulation mechanism and the second conveying mesh belt and the third conveying mesh belt, and a convection zone is formed at the position, corresponding to the middle layer air circulation port, of the upper air circulation and the lower air circulation.

2. The heat exchange device according to claim 1, wherein the first mesh belt has a conveying speed higher than that of the third mesh belt to avoid excessive drying of the surface of the heat exchange medium when drying is performed; the conveying speed of the third conveying mesh belt is higher than that of the second conveying mesh belt, so that the heat exchange medium can complete heat exchange on the third conveying mesh belt and the second conveying mesh belt.

3. The heat exchange apparatus of claim 1, wherein the upwind circulation mechanism comprises:

the first condenser is arranged in the air circulation treatment area, and one end of the first condenser is connected with the side wall of the partition plate; and

and the upper fan is arranged above the first condenser, and an air outlet of the upper fan faces the upper air circulation port.

4. The heat exchange device of claim 3, wherein the downwind circulation mechanism comprises:

the lower fan is arranged at the bottom of the drying area and is positioned on one side of the lower air circulation port;

the dust remover is arranged in the air circulation processing area and is positioned on one side of the upper air circulation mechanism, which is far away from the partition plate;

the heat exchanger is arranged at the bottom of the dust remover;

the heat regenerator is arranged below the heat exchanger;

the evaporator is arranged below the heat regenerator;

the partition plate is arranged on one side of the evaporator close to the partition plate, and a mounting area is formed between the partition plate and the partition plate; and

a second condenser installed in the installation area;

the lower fan provides driving force for hot air, so that the hot air sequentially passes through the second conveying mesh belt, the third conveying mesh belt, the dust remover, the heat exchanger, the heat regenerator, the evaporator and the second condenser and then enters the lower fan again for next circulation.

5. The heat exchange device according to claim 4, wherein a baffle is provided at the middle layer air circulation port in the air circulation treatment zone, the baffle is disposed obliquely so that a first air passage is formed between a top surface of the baffle and the first condenser, and a second air passage is formed between a bottom surface of the baffle and the partition plate.

6. The heat exchange device according to claim 4, wherein a first slitter is provided at the feed inlet of the first foraminous conveyor belt, and a second slitter is provided at the feed inlet of the third foraminous conveyor belt.

7. The heat exchange device of claim 4, wherein a water pan is provided below the evaporator, and a drain line is provided on the water pan.

8. The heat exchange device of claim 4, further comprising:

a compressor mounted within the wind circulation treatment zone; and

the liquid storage tank is arranged on one side of the compressor and is communicated with the compressor through a pipeline;

the liquid storage tank provides media for the first condenser, the heat exchanger, the heat regenerator, the evaporator and the second condenser through pipelines.

9. The heat exchange device of claim 1, further comprising a heater installed at an air inlet of the lower fan.

10. The heat exchange device of claim 9, wherein the heater is an electric heater or a microwave heater.

Technical Field

The invention relates to the technical field of heat exchange, in particular to a heat exchange device.

Background

Heat exchange is the process of heat transfer between two objects or parts of the same object due to temperature differences. Heat exchange is generally accomplished by three means, heat conduction, heat convection, and heat radiation.

Heat exchange is commonly used in the industries of heat supply, refrigeration and air conditioning, domestic hot water, food production, technology, heat recovery, utilization of natural energy and the like, and the existing hot air drying device has the big problem of fan energy consumption when performing multilayer drying.

Disclosure of Invention

The invention aims to solve the problem that the energy consumption of a fan is high when drying is carried out in a heat exchange mode in the prior art, and provides a heat exchange device.

The technical scheme adopted by the invention is as follows:

a heat exchange apparatus comprising:

a drying box;

the partition board is arranged in the drying box and divides the interior of the drying box into a drying area and an air circulation treatment area, and an upper air circulation opening, a middle air circulation opening and a lower air circulation opening which are used for communicating the drying area and the air circulation treatment area are formed in the partition board;

the first conveying mesh belt is arranged in the drying area and is positioned below the upper air circulation port;

the second conveying mesh belt is arranged in the drying area and is positioned above the downwind circulation port;

the third conveying mesh belt is arranged in the drying area and is positioned between the second conveying mesh belt and the middle layer air circulation opening;

the upper air circulating mechanism is arranged in the air circulating treatment area and is positioned at the upper air circulating opening; and

the downwind circulating mechanism is arranged in the wind circulating treatment area and is positioned at the downwind circulating port;

and an upper air circulation is formed between the upper air circulation mechanism and the first conveying mesh belt, a lower air circulation is formed between the lower air circulation mechanism and the second conveying mesh belt and the third conveying mesh belt, and a convection zone is formed at the position, corresponding to the middle layer air circulation port, of the upper air circulation and the lower air circulation.

Optionally, when drying is performed, the conveying speed of the first conveying mesh belt is greater than that of the third conveying mesh belt, so as to avoid the surface of the heat exchange medium from being excessively dried; the conveying speed of the third conveying mesh belt is higher than that of the second conveying mesh belt, so that the heat exchange medium can complete heat exchange on the third conveying mesh belt and the second conveying mesh belt. Optionally, the windward circulation mechanism comprises:

the first condenser is arranged in the air circulation treatment area, and one end of the first condenser is connected with the side wall of the partition plate; and

and the upper fan is arranged above the first condenser, and an air outlet of the upper fan faces the upper air circulation port.

Optionally, the downwind circulation mechanism comprises:

the lower fan is arranged at the bottom of the drying area and is positioned on one side of the lower air circulation port;

the dust remover is arranged in the air circulation processing area and is positioned on one side of the upper air circulation mechanism, which is far away from the partition plate;

the heat exchanger is arranged at the bottom of the dust remover;

the heat regenerator is arranged below the heat exchanger;

the evaporator is arranged below the heat regenerator;

the partition plate is arranged on one side of the evaporator close to the partition plate, and a mounting area is formed between the partition plate and the partition plate; and

a second condenser installed in the installation area;

the lower fan provides driving force for hot air, so that the hot air sequentially passes through the second conveying mesh belt, the third conveying mesh belt, the dust remover, the heat exchanger, the heat regenerator, the evaporator and the second condenser and then enters the lower fan again for next circulation.

Optionally, a baffle is arranged at the middle layer air circulation port in the air circulation treatment area, and the baffle is arranged obliquely, so that a first air duct is formed between the top surface of the baffle and the first condenser, and a second air duct is formed between the bottom surface of the baffle and the partition plate.

Optionally, a first slitter is arranged at a feed inlet of the first conveying mesh belt, and a second slitter is arranged at a feed inlet of the third conveying mesh belt.

Optionally, a water pan is arranged below the evaporator, and a drainage pipeline is arranged on the water pan.

Optionally, the heat exchange device further comprises:

a compressor mounted within the wind circulation treatment zone; and

the liquid storage tank is arranged on one side of the compressor and is communicated with the compressor through a pipeline;

the liquid storage tank provides media for the first condenser, the heat exchanger, the heat regenerator, the evaporator and the second condenser through pipelines.

Optionally, the heat exchange device further comprises a heater installed at an air inlet of the lower fan.

Optionally, the heater is an electric heater or a microwave heater.

Compared with the prior art, the invention has the beneficial effects that:

1. through carrying out the return air processing at middle level circulation wind gap, compare the return air and can reduce lower floor's wind circulation resistance and then reduce fan power, reach the purpose of energy saving.

2. The speed of the first conveying mesh belt is higher than the conveying speed of the third conveying mesh belt, and the speed of the third conveying mesh belt is higher than the speed of the second conveying mesh belt, so that the upper layer air can rapidly carry out primary treatment on the surface of the solid, and then the solid enters the second conveying mesh belt to be dried for the second time, and the solid on the first conveying mesh belt is prevented from being excessively dried.

3. The drying box is processed in a partitioning mode, so that the overall structure of the heat exchange device is more compact.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic overall plan view of a heat exchange device.

Fig. 2 is a schematic plan view of the heat exchange device.

Fig. 3 is a schematic view of the hot air flow direction structure of the heat exchange device.

FIG. 4 is a drying chamber wind field diagram.

FIG. 5 shows a second drying chamber wind field diagram.

Fig. 6 shows a wind field diagram of a scheme with three drying chambers.

Fig. 7 is a schematic view of optimized installation of the spoiler.

Reference numerals:

1. a drying box; 11. a drying zone; 12. a wind circulation treatment area; 2. a partition plate; 21. an upwind circulation port; 22. a middle layer wind circulation port; 23. a downwind circulation port; 3. a first conveying mesh belt; 4. a second conveying mesh belt; 5. a third conveying mesh belt; 6. an upwind circulation mechanism; 61. a first condenser; 62. a fan is arranged; 7. a downwind circulation mechanism; 71. a lower fan; 72. a dust remover; 73. a heat exchanger; 74. a heat regenerator; 75. an evaporator; 76. a partition plate; 77. a second condenser; 8. a baffle plate; 81. a first air duct; 82. a second air duct; 9. a first slitter; 100. a second slitter; 110. a water pan; 120. a compressor; 130. a liquid storage tank; 140. a heater; A. an upwind circulation zone; B. a downwind circulation zone; C. a convection zone.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate an orientation or positional relationship based on that shown in the drawings, or the orientation or positional relationship conventionally used in the use of the products of the present invention, or the orientation or positional relationship conventionally understood by those skilled in the art, are merely for convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, 2 and 3, an embodiment of the present invention provides a heat exchange apparatus including: the drying device comprises a drying box 1, wherein the inside of the drying box 1 is divided into a drying area 11 and an air circulation processing area 12 by a partition plate 2, the drying area 11 is sequentially provided with a first conveying mesh belt 3, a third conveying mesh belt 5, a second conveying mesh belt 4 and a lower fan 71 from top to bottom, and an upper air circulation opening 21 is formed in the partition plate 2 above the first conveying mesh belt 3; a middle layer air circulation port 22 is arranged on the partition board 2 positioned between the first conveying mesh belt 3 and the third conveying mesh belt 5, a downwind circulation port 23 is arranged on the partition board 2 positioned below the second conveying mesh belt 4, and a downwind fan 71 is arranged on one side of the downwind circulation port 23;

an upper fan 62, a first condenser 61, a dust remover 72, a heat exchanger 73, a heat regenerator 74, an evaporator 75 and a second condenser 77 are arranged in the air circulation processing area 12, the upper fan 62 and the first condenser 61 are arranged at one side of an upper air circulation port 21, the upper fan 62 is positioned above the first condenser 61, an outlet air port of the upper fan 62 is arranged towards one side of the drying area 11, air blown by a lower fan 71 enters the air circulation processing area 12 through a middle layer air circulation port 22, and a part of the air enters the upper fan 62 for upper air circulation after being subjected to condensation processing by the first condenser 61, wherein the upper air circulation area A (shown in FIG. 3); the hot air circulated by the upper fan 62 and the hot air circulated by the lower fan 71 form convection between the first mesh belt 3 and the third mesh belt 5, so that the upper layer air circulation and the lower layer air circulation meet in a convection region C (shown in fig. 3) between the first mesh belt 3 and the third mesh belt 5. The hot air is circulated back between the first conveying mesh belt 3 and the third conveying mesh belt 5, and the working power of the upper fan 62 and the lower fan 71 is reduced, so that the purpose of saving energy is achieved.

The dust remover 72 and the heat exchanger 73 are installed on one side of an air inlet of the upper fan 62, the baffle 8 is arranged at the middle layer air circulation port 22, the baffle 8 is arranged obliquely, so that a part of hot air entering from the middle layer air circulation port 22 is sucked by the upper fan 62 installed on one side of the top close to the drying zone 11 for upper layer air circulation, the other part of air is processed by the dust remover 72 and the heat exchanger 73 installed on the side wall far from the drying zone 11, the hot air is processed by the dust remover 72 and then enters the heat exchanger 73 for heat exchange treatment, the hot air after heat exchange is processed by the heat regenerator 74 and the evaporator 75 installed below the heat exchanger 73, the second condenser 77 is installed on one side of the evaporator 75 and close to one side of the drying zone 11, the space between the second condenser 77 and the evaporator 75 is partitioned by the partition plate 76, the hot air after heat exchange treatment by the heat regenerator 74 enters the evaporator 75 for evaporation treatment, the hot air after evaporation treatment enters the second condenser 77 through the heat regenerator 74 for heating, at this time, the hot air after treatment of the heat regenerator 74 enters the second condenser 77 through the bottom of the baffle 8 for heating treatment, the hot air after heating treatment enters the next circulation through the down fan 71, each part of the hot air path is a down air circulation area B (as shown in fig. 3), the condensed liquid is collected through a water receiving tray 110 arranged below the evaporator 75 and is guided out of the device, and a compressor 120 and a liquid outlet tank arranged below the left side of the air circulation treatment area 12 provide refrigerant media for each component.

In the using process, the conveying speed of the first conveying mesh belt is higher than that of the third conveying mesh belt in the embodiment, so that the surface of the heat exchange medium is prevented from being excessively dried; the conveying speed of the third conveying mesh belt is higher than that of the second conveying mesh belt, so that the heat exchange medium can complete heat exchange on the third conveying mesh belt and the second conveying mesh belt.

More specifically: the first conveying mesh belt 3 has a conveying speed of 0.34 m/min to 0.4 m/min, wherein it is preferable that: 0.34 m/min, 0.35 m/min, 0.36 m/min, 0.37 m/min, 0.38 m/min, 0.39 m/min, 0.4 m/min, with 0.36 m/min being most preferred;

the conveying speed of the third conveying net belt 5 is 0.26 m/min-0.3 m/min, wherein the preferable conveying speeds are as follows: 0.26 m/min, 0.27 m/min, 0.28 m/min, 0.29 m/min, 0.3 m/min, with 0.28 m/min being most preferred;

the second mesh belt 4 is preferably conveyed at a speed of 0.18 m/min to 0.22 m/min, more preferably 0.18 m/min, 0.19 m/min, 0.2 m/min, 0.21 m/min, 0.22 m/min, most preferably 0.2 m/min. In another embodiment, as shown in fig. 1, in order to reduce the start-up time of the apparatus in order to facilitate the use of the apparatus in winter, a heater 140 is provided at the air inlet of the lower fan 71, and the heater 140 may be an electric heater 140 or a microwave heater 140.

In another embodiment, as shown in fig. 2, in order to facilitate the drying treatment of materials similar to sludge, a first slitter 9 is provided at the inlet of the first mesh belt 3, and a second slitter 100 is provided at the inlet of the third mesh belt 5. Through carrying out the slitting with mud, improve the area of contact of hot-blast and mud for hot-blast takes away the moisture in the mud fast in circulation process.

The specific working principle is as follows:

as shown in fig. 1, 2 and 3, the heat exchange device can be directly started in summer in south, and circularly blows air by a lower fan 71, after the hot air firstly passes through a second conveyer belt, the air circulated through the third mesh belt 5 and the upper fan 62 forms convection between the first mesh belt 3 and the third mesh belt 5, make in the hot-blast first condenser 61 and the dust remover 72 of entering through first wind channel 81 of convection current, the heat exchanger 73 carries out the heat transfer again behind the hot-blast in the entering dust remover 72, hot-blast after the heat transfer gets into through second wind channel 82 behind regenerator 74 and the evaporimeter 75 and heats in getting into second condenser 77, hot-blast condenses in evaporimeter 75, the water after the condensation is collected through setting up the water collector 110 in evaporimeter 75 below, the water after the collection passes through the outside of this sludge drying equipment of pipeline discharge, hot-blast second cycle carries out after the second condenser 77 heats.

The upper fan 62 is arranged at the upper air circulation port 21, an air outlet of the upper fan 62 is arranged towards the drying zone 11, so that the upper fan 62 sucks part of hot air entering the first air duct 81, the hot air entering the upper fan 62 is heated by the first condenser 61 and then blown out, the sludge on the first conveying mesh belt 3 is subjected to primary drying treatment, and the conveying speed of the first conveying mesh belt 3 is set to be higher than the conveying speeds of the other two conveying mesh belts in order to avoid over-drying the surface of the sludge on the first conveying mesh belt 3; in order to avoid excessive drying of the sludge after secondary slitting on the third conveying mesh belt 5, the conveying speed of the third conveying mesh belt 5 is higher than that of the second conveying mesh belt 4, and the speed of the second conveying mesh belt 4 is lower than that of the other two conveying mesh belts, so that heat exchange of the sludge on the second conveying mesh belt 4 is completed.

If the drying box is used in winter, the gas in the drying box 1 needs to be preheated by the heater 140, so that the starting time is prevented from being too long.

More specifically, the present embodiment will be described with reference to sludge as an example.

For 9 tons of municipal sludge, the water content of an inlet is 80%, the water content of an outlet is 40%, flow field simulation is carried out by using a lower inlet and upper outlet air-out mode of the traditional sludge drying equipment (scheme one) is shown in figure 4), a side inlet and upper return air outlet mode (scheme two) is shown in figure 5) and a side inlet and middle return air outlet mode (scheme three) is shown in figure 6), and the air distribution condition of each layer of mesh belt is observed and the air resistance is analyzed.

	Scheme one	Scheme two	Scheme three
				Amount of sludge	9t	9t	9t
Water content of inlet	80%	80%	80%
				Water content at outlet	40%	40%	40%
Air quantity of upper fan		10000m3/h*4	10000 m3/h*4
				Lower fan air volume	15000 m3/h*4	5000 m3/h*4	5000 m3/h*4
Temperature of upper fan		75℃	75℃
				Lower fan temperature	75℃	80℃	80℃
Air speed Cv value of first layer net belt	5%	35%	25%
				Air velocity Cv value of second layer net belt	20%	15%	10%
Air speed Cv value of third layer net belt	25%	20%	20%
				Upper fan resistance		500Pa	150 Pa
Resistance of lower fan	2000Pa	1500 Pa	500 Pa
				Power of upper wind turbine		1.1.2*4 kW	0.0.5*4 kW
Down fan power	3kW*4	2*4 kW	1.50*4 kW
				Total power of fan	12kW	12.8kW	8kW

As can be seen from the above table, the values of the air velocities Cv at the inlet of the three mesh belts in the scheme (1) are all less than 40%, the requirement of the industry on the uniformity of the mesh belts at the inlet is met, the total power of the fan is calculated to be 8kW, the total power of the fan of the traditional sludge drying equipment is 12kW, and the power of the fan is saved by 28.5%. The third scheme is obviously superior to the first traditional scheme in the aspect of saving the total power of the fan. In the second scheme, the upper side air inlet and the lower side air inlet are mixed before the first layer of mesh belt, so that the inlet speed Cv value of the first layer of mesh belt is =35% and is more than 40%, and the power of the fan in the second scheme is 12.8kW and is more than 12kW, which shows that the second scheme is not superior to the first scheme in the aspects of air uniformity and fan power saving.

However, as shown in the simulated cloud chart, the third solution does not completely solve the problems of air vortex and uneven velocity distribution at the mesh belt in the drying chamber of the existing sludge drying equipment, and in order to eliminate the influence of the air vortex and the uneven velocity on the heat exchange efficiency, a flow guide plate and a flow equalizing plate are arranged at the upper side air supply position and the lower side air supply position, as shown in fig. 7.

With 9 tons of municipal sludge, import moisture content is 80%, export moisture content is 40% for the example, to traditional low temperature sludge drying equipment down in the mode of going out, side to go up the return air mode and side to carry out Dymola modeling and simulation, obtain the result as follows:

	scheme one	Scheme two	Scheme three
				Amount of sludge	9t	9t	9t
Water content of inlet	80%	80%	80%
				Water content at outlet	40%	40%	40%
Power of fan	12kW	12.8kW	8kW
				Compressor power	15kW	13kW	12kW
Ton mud energy consumption	230 kW.h	200kW.h	180kW.h
				SMER	3.261	3.445	3.7

Based on the Dymola simulation results, it can be known that: the energy consumption of one ton of mud in the scheme is 230 kW.h, the energy consumption of two tons of mud in the scheme is 200kW.h, the energy consumption of the middle return air ton of three sides of the scheme is 180 kW.h, the energy consumption of three tons of mud in the scheme is reduced by 15.8% compared with the energy consumption of the ton of mud in an in-out mode of the traditional sludge drying equipment, and the energy consumption of two tons of mud in the scheme is reduced by 10.8% compared with the energy consumption of the ton of mud in the traditional equipment. The side-in and up-returning air and the side near-middle returning air are superior to the traditional low-temperature sludge drying equipment in the aspects of ton sludge energy consumption.

Based on the results of numerical simulation software and Dymola heat transfer chemistry analysis software, the side-in and middle-return air arrangement scheme is superior to other two schemes in fan power, compressor power and ton sludge energy consumption, and the whole SMER =3.7 > 3.5 of the equipment can effectively reduce the running cost of low-temperature sludge drying equipment, and has higher economic value.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.