Recyclable dryer for insulating material

Abstract

The utility model relates to a recyclable dryer for insulating materials, and belongs to the field of insulating material production. Comprising a drying system and a recovery system, the drying system adopts spray drying, and the recovery system comprises a condensate water collection heat exchanger and a buffer tank; the condensate water collecting heat exchanger is a shell and tube imitating type heat exchanger, shell and tubes are vertically arranged, and the tube pass flow direction is the up-down flow direction. The shell pass gas outlet is connected with a liquid separation tank, the shell pass condensate water outlet is connected with a buffer tank, and the buffer tank is connected with a water supply line of the material treatment unit through a circulating pump. According to the utility model, heat and materials lost by the dryer can be effectively recovered, and the recovery system is low in energy consumption and has good economical efficiency.

Description

Technical Field

[0001] This utility model relates to a dryer for recyclable insulating materials, belonging to the field of insulating material production. Background Technology

[0002] Spray dryers are a common type of dryer, but they are mainly characterized by low material yield and low thermal efficiency. Spray dryers are also used in the production of insulating materials. By modifying existing processes and equipment, they can improve the efficiency of individual devices or compensate for the inherent defects of certain devices. This is a relatively successful modification method in chemical production. Summary of the Invention

[0003] Based on the problems described in the background, the problem that this utility model aims to solve is:

[0004] How to solve the material loss caused by low material yield, and how to improve the thermal efficiency of spray dryers.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A recyclable dryer for insulating materials includes a drying system and a recovery system. The drying system employs spray drying, and the recovery system includes a condensate collection heat exchanger and a buffer tank. The condensate collection heat exchanger is a shell-and-tube heat exchanger with vertically arranged tubes, ensuring an up-and-down flow direction on the tube side. The shell-side inlet is located in the middle of the condensate collection heat exchanger. The top of the condensate collection heat exchanger has a shell-side gas outlet and a tube-side outlet, while the bottom has a shell-side condensate outlet and a tube-side inlet. The separator in the drying system separates the dry material from the hot air. The hot air is transported to the shell-side inlet of the condensate collection heat exchanger via pipeline. The shell-side gas outlet is connected to a separating tank, and the shell-side condensate outlet is connected to the buffer tank. The buffer tank is connected to the water supply line of the material handling unit via a circulating pump.

[0007] This invention utilizes a condensate collection heat exchanger to recover condensate and water vapor from small droplets in the hot, humid air generated during spray drying. The condensate containing material is then transported to a process before the drying step, where the material is reintroduced into the condensate before the drying process. This reduces material loss during spray drying, indirectly improving yield. The condensate collection heat exchanger also recovers heat from the hot, humid air, further reducing heat loss. The entire recovery system requires only one circulating pump, resulting in low energy consumption and high economic efficiency.

[0008] A condensate collection heat exchanger combines a shell-and-tube heat exchanger with a condensate collection tank. The vertically placed tubes act as condensate collection tubes, where small droplets in the hot, humid air adhere to the tube walls, condense into larger droplets, and fall to the bottom of the shell side. Simultaneously, the tubes also contain cooling energy that needs to be heated. As the cooling energy absorbs heat from the hot air, the steam condenses into water, which also flows down the tube walls to the bottom of the shell side. The condensate collection heat exchanger separates air from the two phases of water while simultaneously providing heat to the tube side, achieving two benefits at once.

[0009] The condensate condensation process is also a material recovery process. Considering the low material content in the condensate, directly discharging it to the dryer inlet would increase the water content of the material, increase the dryer's energy consumption, and result in poor recovery. However, supplying the condensate to the water supply line for material processing before the drying step reduces water demand and lowers water costs; it also allows the material to return to the pre-drying stage without affecting its moisture content, and the dryer's energy consumption does not increase.

[0010] Preferably, a level gauge is provided at the bottom of the condensate collection heat exchanger to monitor the amount of condensate accumulating at the bottom of the condensate collection heat exchanger.

[0011] Preferably, the buffer tank is equipped with a buffer tank level gauge and a water supply line, with a water supply control valve on the water supply line. The buffer tank level gauge is electrically connected to the water supply control valve. In the event of a condensate collection heat exchanger failure, the level in the buffer tank can be maintained, ensuring that the material processing water supply line is not affected by the condensate collection heat exchanger. Because the buffer tank and the condensate collection heat exchanger are interconnected, the water supply can also provide some cooling to the faulty condensate collection heat exchanger, minimizing the impact on downstream processes.

[0012] Preferably, the circulating pump outlet is equipped with a flow control meter and a flow control valve, and the material processing unit water supply line is equipped with a water supply control valve. The flow control meter is connected to both the flow control valve and the water supply control valve. When the circulating pump malfunctions, the water supply to the material processing line can be adjusted through the aforementioned control interlock to ensure normal operation of the material processing system.

[0013] Preferably, the bottom of the separator is connected to the water supply control valve via a pipeline. Water and materials carried by the air are further collected and discharged to the buffer tank via the water supply line.

[0014] The beneficial effects of this utility model are:

[0015] This invention can effectively recover the heat and materials lost in the dryer, and the recovery system has low energy consumption and good economic efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present utility model.

[0017] In the diagram: 1 is the condensate collection heat exchanger; 2 is the buffer tank; 3 is the circulating pump; 4 is the separator; 5 is the separator; 6 is the water supply line for the material handling unit; 11 is the shell-side inlet; 12 is the shell-side gas outlet; 13 is the shell-side condensate outlet; 14 is the tube-side outlet; 15 is the tube-side inlet; 16 is the level gauge; 21 is the buffer tank level gauge; 22 is the makeup water line; 23 is the makeup water control valve; 31 is the flow control valve; 32 is the flow control meter; 61 is the water supply control valve. Detailed Implementation

[0018] Example 1

[0019] A recyclable dryer for insulating materials includes a drying system and a recovery system. The drying system employs spray drying, and the recovery system includes a condensate collection heat exchanger 1 and a buffer tank 2. The condensate collection heat exchanger 1 is a shell-and-tube heat exchanger with vertically arranged tubes, resulting in an up-and-down flow direction in the tube side. The shell-side inlet 11 is located in the middle of the condensate collection heat exchanger. The top of the condensate collection heat exchanger 1 has a shell-side gas outlet 12 and a tube-side outlet 14, and the bottom has a shell-side condensate outlet 13 and a tube-side inlet 15. The separator 5 of the drying system separates the dry material from the hot air. The hot air is transported to the shell-side inlet 11 of the condensate collection heat exchanger 1 through a pipeline. The shell-side gas outlet 12 is connected to a liquid separator 4, and the shell-side condensate outlet 13 is connected to the buffer tank 2. The buffer tank 2 is connected to the water supply line 6 of the material handling unit via a circulating pump 3.

[0020] The bottom of the condensate collection heat exchanger 1 is equipped with a level gauge 16.

[0021] The buffer tank 2 is equipped with a buffer tank level gauge 21, a water supply line 22, and a water supply control valve 23 on the water supply line 22. The buffer tank level gauge 21 is electrically connected to the water supply control valve 22.

[0022] The outlet of the circulating pump 3 is equipped with a flow control meter 32 and a flow control valve 31, and the water supply line 6 of the material processing unit is equipped with a water supply control valve 61. The flow control meter 32 is electrically connected to the flow control valve 31 and the water supply control valve 61.

[0023] The bottom of the separator 4 is connected to the water replenishment control valve 23 via a pipeline.

[0024] Working principle:

[0025] The hot, humid air generated by the spray dryer is discharged to the shell side of the condensate collection heat exchanger 1 through the separator 5. The hot, humid air is cooled and condensed in the condensate collection heat exchanger 1, and separated from the air. The air goes from the shell side air outlet 12 to the liquid separator 4 for secondary liquid separation. The condensate goes from the shell side condensate outlet 13 to the buffer tank 2, and is then sent to the water supply line 6 of the material handling unit by the circulating pump 3. The liquid at the bottom of the liquid separator 4 is recovered to the buffer tank 2. The top of the liquid separator is equipped with an exhaust line to discharge the air that has undergone secondary dehydration to the atmosphere.

Claims

1. A dryer for recyclable insulating materials, comprising a drying system, characterized in that, It also includes a recovery system. The drying system adopts spray drying. The recovery system includes a condensate collection heat exchanger (1) and a buffer tank (2). The condensate collection heat exchanger (1) is a shell-and-tube heat exchanger with vertically arranged tubes so that the tube side flows in the up-down direction. The shell side inlet (11) is located in the middle of the condensate collection heat exchanger. The top of the condensate collection heat exchanger (1) is provided with a shell side gas outlet (12) and a tube side outlet (14), and the bottom is provided with a shell side condensate outlet (13) and a tube side inlet (15). The separator (5) of the drying system separates the dry material and hot air. The hot air is transported to the shell side inlet (11) of the condensate collection heat exchanger (1) through a pipeline. The shell side gas outlet (12) is connected to a liquid separator (4), and the shell side condensate outlet (13) is connected to a buffer tank (2). The buffer tank (2) is connected to the water supply line (6) of the material processing unit through a circulating pump (3).

2. The dryer for recyclable insulating materials according to claim 1, characterized in that, The bottom of the condensate collection heat exchanger (1) is equipped with a level gauge (16).

3. The dryer for recyclable insulating materials according to claim 1, characterized in that, The buffer tank (2) is equipped with a buffer tank level gauge (21), the buffer tank (2) is equipped with a water supply line (22), the water supply line (22) is equipped with a water supply control valve (23), and the buffer tank level gauge (21) is electrically connected to the water supply control valve (23).

4. A dryer for recyclable insulating materials according to claim 1, characterized in that, The outlet of the circulating pump (3) is equipped with a flow control meter (32) and a flow control valve (31), and the water supply line (6) of the material processing unit is equipped with a water supply control valve (61). The flow control meter (32) is electrically connected to the flow control valve (31) and the water supply control valve (61).

5. A dryer for recyclable insulating materials according to claim 1, characterized in that, The bottom of the liquid separator (4) is connected to the water replenishment control valve (23) via a pipeline.

Images