Internal air duct structure of belt type sludge drying machine

Abstract

The utility model discloses an internal air duct structure of a belt type sludge drying machine, and belongs to the technical field of drying machines, the internal air duct structure comprises a box body, the box body is divided into a drying chamber and a heat exchange chamber, the top of the heat exchange chamber is provided with a centrifugal fan, an air inlet of the centrifugal fan is provided with a fan volute, an air inlet of the fan volute is communicated with the heat exchange chamber, and an air outlet of the fan volute is communicated with the heat exchange chamber; an air outlet of the fan volute is connected with an air inducing pipe, a plenum chamber is arranged at the top of the drying chamber, the plenum chamber is connected with the air inducing pipe through a metal corrugated pipe, a flow equalizing plate is arranged at the end, away from the air inducing pipe, of the plenum chamber, a heater is arranged below the plenum chamber and located above the conveying belt, and the air outlet of the plenum chamber is connected with the air inducing pipe through a metal corrugated pipe. An air vent is formed between the bottom of the drying chamber and the heat exchange chamber, and a surface air cooler is arranged in the middle of the heat exchange chamber. According to the conveying device, air force of the centrifugal fan is conveyed into the static pressure box through the air inducing pipe, then the conveyed air force is dispersed through the flow equalizing plate, and therefore the air force can be evenly dispersed to the position above the conveying belt.

Description

Technical Field

[0001] The present application belongs to the technical field of dryers, and in particular to an internal air duct structure of a belt-type sludge dryer. Background Art

[0002] The belt sludge dryer uses hot air to remove moisture from the sludge. The humid hot air is cooled and dehumidified by the surface cooler, and then heated by the heater to become dry hot air for recycling.

[0003] Patent Publication (Announcement) No.: CN103693837A discloses a sludge drying machine. During the transportation on the conveyor platform, the conveying starting end of the top stainless steel mesh belt conveyor platform in the drying chamber is used to receive the continuously falling sludge to be processed. The sludge is spread all over the stainless steel mesh belt conveyor platform under the conveying action of each layer of the stainless steel mesh belt conveyor platform and falls layer by layer with the conveying. At the same time, under the action of the induced draft fan, 90% of the airflow discharged from the hot air outlet of the circulating air heating chamber enters the drying chamber through the air duct, and 10% of the airflow is discharged through the waste outlet and harmlessly treated. The hot air flow entering the drying chamber flows from top to bottom to dry the sludge on each layer of the stainless steel mesh belt conveyor platform. The wind entering the drying chamber directly enters from the hot air inlet on the side, which will cause the sludge on the side close to the hot air inlet to dry faster, and the sludge in other positions to dry slower, which will cause uneven sludge drying and affect the quality of sludge drying. Therefore, an internal air duct structure for drying sludge more evenly is needed. Utility Model Content

[0004] In order to solve the above problems, the present application proposes an internal air duct structure of a belt-type sludge dryer.

[0005] The purpose of the present application is to provide an internal air duct structure of a belt-type sludge dryer, in which the wind force of the centrifugal fan is transported to the static pressure box through the induced draft duct, and then the transported wind force is dispersed through the flow equalizing plate, so that the wind force can be evenly dispersed above the conveyor belt to avoid uneven wind force. In this way, the sludge can be dried evenly when drying, thereby improving the quality of sludge drying.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] The internal air duct structure of a belt-type sludge dryer comprises: a box body, which is divided into a drying chamber and a heat exchange chamber, a centrifugal fan is provided on the top of the heat exchange chamber, and the air inlet of the centrifugal fan is provided with a fan volute, the air inlet of the fan volute is communicated with the heat exchange chamber, the air outlet of the fan volute is connected with an induced draft duct, the end of the induced draft duct away from the fan volute is inserted into the top of the drying chamber, a static pressure box is provided on the top of the drying chamber, the static pressure box and the induced draft duct are connected by a metal bellows, a flow equalizing plate is provided at the end of the static pressure box away from the induced draft duct, a heater is provided under the static pressure box, and the heater is located above the conveyor belt, an air vent is provided between the bottom of the drying chamber and the heat exchange chamber, and a surface cooler is provided in the middle of the heat exchange chamber.

[0008] Furthermore, a filter is provided on the vent.

[0009] Furthermore, the induced draft duct is in the shape of an elongated strip, and the induced draft duct is connected to the fan volute by bolts.

[0010] Furthermore, the metal bellows and the static pressure box are perpendicular to each other, and the air outlet of the air duct and the air inlet of the static pressure box are parallel to each other.

[0011] Furthermore, the static pressure box is a rectangular box, the length of the static pressure box is the same as the width of the drying chamber, a circular inlet is provided at one end of the static pressure box, the circular inlet is connected to the metal bellows, and a rectangular outlet is provided at the end of the static pressure box away from the circular inlet, the rectangular outlet is connected to a flow equalizing plate, and circular air outlets are evenly arranged on the flow equalizing plate.

[0012] Furthermore, the width of the flow equalizing plate is smaller than the width of the heater, and the width of the heater is larger than the width of the conveyor belt.

[0013] Compared with the prior art, the beneficial effects of this application are:

[0014] The present application transmits the wind force of the centrifugal fan to the static pressure box through the induced draft duct, and then disperses the transmitted wind force through the flow equalizing plate, so that the wind force can be evenly dispersed above the conveyor belt to avoid uneven wind force. In this way, the sludge can be dried evenly when drying, thereby improving the quality of sludge drying.

[0015] The present application directly heats the gas output from the flow equalizing plate by arranging a heater under the flow equalizing plate. The heated gas directly dries the sludge on the conveyor belt, thereby improving the drying effect.

[0016] The present application filters the residual impurities in the humid gas through a filter, dries and cools the humid gas through a surface cooler, and finally transports it to the induced draft duct through a centrifugal fan, thus realizing the circulation of wind energy, with high energy utilization, low loss, high production capacity and good temperature uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of this application;

[0018] Figure 2 A three-dimensional schematic diagram of the air duct of this application;

[0019] Figure 3 A three-dimensional schematic diagram of the metal bellows of the present application;

[0020] Figure 4 A three-dimensional schematic diagram of the static pressure box for this application

[0021] Figure 5 This is a three-dimensional schematic diagram of the current equalizing plate of this application;

[0022] Among them: 1. Box body, 2. Drying chamber, 3. Heat exchange chamber, 4. Fan volute, 5. Centrifugal fan, 6. Air duct, 7. Metal bellows, 8. Static pressure box, 9. Flow equalizing plate, 10. Heater, 11. Upper mesh belt, 12. Lower mesh belt, 13. Filter, 14. Surface cooler. DETAILED DESCRIPTION

[0023] The present application is further described below in conjunction with the accompanying drawings and embodiments. Example 1

[0024] An internal air duct structure of a belt type sludge dryer, such as Figure 1-5As shown, it includes: a box body 1, which is divided into a drying chamber 2 and a heat exchange chamber 3, and the drying chamber 2 and the heat exchange chamber 3 are divided by a partition. A centrifugal fan 5 is provided on the top of the heat exchange chamber 3, and an air inlet of the centrifugal fan 5 is provided with a fan volute 4. The centrifugal fan 5 blows the air in the heat exchange chamber 3 into the drying chamber 2 through the fan volute 4. The air inlet of the fan volute 4 is communicated with the heat exchange chamber 3, and the air outlet of the fan volute 4 is connected with the induced air duct 6. The end of the induced air duct 6 away from the fan volute 4 is inserted into the top of the drying chamber 2. A static pressure box 8 is provided on the top of the drying chamber 2. The static pressure box 8 disperses the airflow introduced in the induced air duct 6. The static pressure box 8 is connected to the induced air duct 6 by a metal bellows 7. The static pressure box 8 is away from the induced air duct A flow equalizing plate 9 is provided at one end of the air duct 6, and the airflow is more finely dispersed by the flow equalizing plate 9. A heater 10 is provided under the static pressure box 8, and the heater 10 is located above the conveyor belt. After the wind in the static pressure box 8 is dispersed, it is heated by the heater 10 to become a dry hot air flow, which heats the wet sludge on the conveyor belt and takes out the moisture therein to become a moist hot air flow. The conveyor belt transports the sludge. The conveyor belt is divided into an upper mesh belt 11 and a lower mesh belt 12, and the upper mesh belt 11 and the lower mesh belt 12 are parallel to each other. A vent is provided between the bottom of the drying chamber 2 and the heat exchange chamber 3, and a surface cooler 14 is provided in the middle of the heat exchange chamber 3. The hot air in the drying chamber 2 is cooled by the surface cooler 14.

[0025] like Figure 1 As shown, a filter 13 is provided on the vent, and the airflow in the drying chamber 2 is filtered by the filter 13 to prevent sludge residue from entering the heat exchange chamber 3 and affecting the normal operation of the surface cooler 14.

[0026] like Figure 2 As shown, the induced draft duct 6 is in the shape of an elongated strip, and the induced draft duct 6 is connected to the fan volute 4 by bolts and is firmly fixed.

[0027] like Figure 1 As shown, the metal bellows 7 and the static pressure box 8 are perpendicular to each other, and the air outlet of the air duct 6 and the air inlet of the static pressure box 8 are parallel to each other. Figure 3 As shown, the metal bellows 7 has good telescopic performance, and the length of the metal bellows 7 is adjusted according to the length of the air duct 6 reaching the static pressure box 8.

[0028] like Figure 4 As shown, the static pressure box 8 is a rectangular box body 1, and the length of the static pressure box 8 is the same as the width of the drying chamber 2, which is convenient for the installation between the static pressure box 8 and the drying chamber 2. One end of the static pressure box 8 is provided with a circular inlet, and the circular inlet is connected to the metal bellows 7. The end of the static pressure box 8 away from the circular inlet is provided with a rectangular outlet, and the rectangular outlet is connected to the flow equalizing plate 9, as shown in FIG. Figure 5As shown, circular air outlets are evenly arranged on the flow equalizing plate 9, and the gas introduced into the static pressure box 8 is evenly discharged through the flow equalizing plate 9.

[0029] like Figure 1 As shown, the width of the flow equalizing plate 9 is smaller than the width of the heater 10, and the width of the heater 10 is larger than the width of the conveyor belt, so that the airflow output by the flow equalizing plate 9 can be completely heated by the heater 10, and the heated gas directly dries the sludge on the conveyor belt, thereby improving the drying effect.

[0030] In the technical solution of the present application, when the sludge enters the upper mesh belt 11 from the entrance of the box body 1, the centrifugal fan 5 inhales the dry cold air that has been cooled and dehumidified by the surface cooler 14, and sends the dry cold air into the induced draft duct 6 through the fan volute 4. The dry cold air then passes through the metal bellows 7 and enters the static pressure box 8. The cold air entering the static pressure box 8 is evenly distributed through the flow equalizing plate 9 and then sent to the heater 10. After the heater 10 heats the cold air to the set temperature, the cold air becomes dry hot air. The dry hot air then passes through the upper mesh belt 11 and the lower mesh belt 12. In this process, the wet sludge is heated, and the dry hot air becomes moist hot air. The moist hot air then passes through the filter 13 to filter the dust generated in the sludge drying process. The filtered moist hot air passes through the surface cooler 14 for cooling and dehumidification to become dry cold air, which is then inhaled by the centrifugal fan 5. The above cycle is repeated to continuously dry the sludge. During the whole cycle, the required wind pressure, air volume and wind uniformity of the circulating wind can be guaranteed to meet the drying requirements, with high energy utilization, low loss, high production capacity and good temperature uniformity. The static pressure box 8 and the flow plate 9 can make the wind force uniform and will not be concentrated on one side of the conveyor belt, so that the moisture content of the dried mud is uniform.

[0031] Although the above describes the specific implementation methods of the present application in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present application. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present application, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present application.

Claims

1. An internal air duct structure of a belt-type sludge dryer, characterized in that: include: A box body, which is divided into a drying chamber and a heat exchange chamber. A centrifugal fan is provided on the top of the heat exchange chamber. The air inlet of the centrifugal fan is provided with a fan volute. The air inlet of the fan volute is communicated with the heat exchange chamber. The air outlet of the fan volute is connected with the induced air duct. The end of the induced air duct away from the fan volute is inserted into the top of the drying chamber. A static pressure box is provided on the top of the drying chamber. The static pressure box and the induced air duct are connected by a metal bellows. A flow equalizing plate is provided at the end of the static pressure box away from the induced air duct. A heater is provided under the static pressure box. The heater is located above the conveyor belt. An air vent is provided between the bottom of the drying chamber and the heat exchange chamber. A surface cooler is provided in the middle of the heat exchange chamber.

2. The internal air duct structure of a belt type sludge dryer according to claim 1, characterized in that: A filter is arranged on the vent.

3. The internal air duct structure of a belt type sludge dryer according to claim 1, characterized in that: The air induced duct is in the shape of an elongated strip, and is connected to the fan volute by bolts.

4. The internal air duct structure of a belt type sludge dryer according to claim 1 is characterized in that: The metal bellows and the static pressure box are perpendicular to each other, and the air outlet of the air induced duct and the air inlet of the static pressure box are parallel to each other.

5. The internal air duct structure of a belt type sludge dryer according to claim 1, characterized in that: The static pressure box is a rectangular box body, the length of which is the same as the width of the drying chamber, a circular inlet is provided at one end of the static pressure box, the circular inlet is connected to the metal bellows, and a rectangular outlet is provided at the end of the static pressure box away from the circular inlet, the rectangular outlet is connected to a flow equalizing plate, and circular air outlets are evenly arranged on the flow equalizing plate.

6. The internal air duct structure of a belt type sludge dryer according to claim 1, characterized in that: The width of the flow equalizing plate is smaller than the width of the heater, and the width of the heater is larger than the width of the conveyor belt.

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