Fourdrinier dryer with waste heat recovery function

Abstract

The utility model relates to the technical field of dryers, in particular to a fourdrinier dryer with a waste heat recovery function. An air inlet is formed in the top of the dryer, an automatic air valve is installed on the air inlet, a metal radiator is arranged at the upper end of the automatic air valve, a water inlet pipe is installed on one side of the metal radiator and connected with a drain valve through a pipeline, and a water outlet pipe is installed on the other side of the metal radiator and connected with a water tank through a pipeline. A hole is formed in the top of the drying machine and additionally provided with an air inlet, an automatic air valve, a metal heat exchanger and a metal primary filter are sequentially arranged above the air inlet, when the drying machine discharges moisture, the automatic air valve is opened, external cold air passes through the primary filter and then is heated by a metal heat radiator and enters the drying machine, and the drying machine discharges moisture. External cold air is heated through heat exchange of condensate water discharged by the original drain valve, and waste heat utilization is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of dryers, in particular to a Fourdrinier dryer with waste heat recovery. Background Art

[0002] Material drying refers to the process of drying materials containing water by heating or other methods. This process can remove moisture on the surface and inside of the material to achieve the purpose of drying.

[0003] The main steps of material drying include: feeding, evaporation, and dehumidification. In this way, after a certain period of time and temperature control, the moisture content of the material gradually decreases until the required degree of dryness is reached. Material drying is suitable for many application scenarios, such as drying of grain, chemical raw materials, pharmaceutical raw materials, ores, etc.

[0004] The moisture generated by the existing drying equipment during drying will also be mixed with the hot air in the dryer, making it difficult for the material to be dried. Therefore, a dehumidification mechanism is installed to discharge the moisture through the dehumidification mechanism. At the same time, air needs to be added to the dryer, but the added air is cold air from the outside. When the cold air from the outside enters the dryer, the drying temperature will drop suddenly. It takes a certain amount of time for the temperature in the dryer to reach the original set temperature. This takes a long time to dry, consumes a lot of energy, and has low work efficiency. At the same time, the temperature in the dryer fluctuates, which will also affect the quality of the dried material. Summary of the invention

[0005] The technical problem to be solved by the utility model is: in order to solve the problems existing in the prior art in the above-mentioned background technology, a fourdrinier dryer with waste heat recovery is provided.

[0006] The utility model solves the technical problem by adopting the following technical solution: a long net dryer with waste heat recovery, comprising a dryer, an air inlet is provided on the top of the dryer, an automatic air valve is installed on the air inlet, a metal radiator is provided on the upper end of the automatic air valve, a water inlet pipe is installed on one side of the metal radiator, the water inlet pipe is connected to a drain valve through a pipeline, a water outlet pipe is installed on the other side of the metal radiator, and the water outlet pipe is connected to a water tank through a pipeline.

[0007] Furthermore, a metal primary filter for filtering external cold air is installed above the metal radiator.

[0008] Furthermore, the steam trap is connected to the steam heat exchanger in the dryer through a pipeline.

[0009] Furthermore, the air outlet of the automatic air valve is provided with a sterilization device for sterilizing and disinfecting the heated air.

[0010] Furthermore, the metal primary filter comprises a filter housing, a switch valve is provided at the bottom of the filter housing, a spray device is installed at the upper end and the side of the filter housing, and the spray device is connected to the water tank.

[0011] Furthermore, the switch valve is an inclined switch valve, and a drain port for draining water is provided at the bottom of the filter housing, and the drain port is located at the inclined lower end of the switch valve.

[0012] Furthermore, the metal radiator includes a radiator shell, in which a coil is installed, one end of the coil is connected to the water inlet pipe, and the other end of the coil is connected to the water outlet pipe, and the outer surface of the coil is covered with cooling fins.

[0013] Furthermore, the radiator shell is a shell surrounded by four sides, and the radiator shell has an air inlet and an air outlet.

[0014] Furthermore, the coil is composed of a plurality of rows of parallel spiral branches between air flow directions.

[0015] The beneficial effects of the utility model are as follows: an air inlet is added to the opening on the top of the dryer (the specific opening size and the number of the air inlets are determined according to the dehumidification air volume of the dryer), and an automatic air valve, a metal heat exchanger, and a metal primary filter are arranged in sequence above the air inlet. When the dryer is dehumidifying, the automatic air valve opens, and the cold air from the outside passes through the primary filter and then is heated by the metal radiator before entering the dryer. The cold air from the outside is heated by heat exchange with condensed water discharged from the original steam trap, thereby realizing waste heat utilization, while ensuring the constancy of the temperature in the dryer and improving the quality of the dried material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the metal primary filter of the utility model;

[0019] Figure 3 It is a bottom view of the metal radiator of the utility model;

[0020] Figure 4 It is a partial enlarged view of the A part of the utility model;

[0021] In the figure: 1. dryer, 2. air inlet, 3. automatic air valve, 4. metal radiator, 5. metal primary filter, 6. water inlet pipe, 7. water outlet pipe, 8. steam trap, 9. filter housing, 10. switch valve, 11. spray device, 12. drain outlet, 13. radiator housing, 14. coil, 15. air inlet, 16. air outlet. DETAILED DESCRIPTION

[0022] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0023] like Figures 1 to 4 A long net dryer with waste heat recovery shown in the figure comprises a dryer 1, an air inlet 2 is provided on the top of the dryer 1, an automatic air valve 3 is installed on the air inlet 2, a metal radiator 4 is provided on the upper end of the automatic air valve 3, a metal primary filter 5 for filtering external cold air is installed above the water of the metal radiator 4, a water inlet pipe 6 is installed on one side of the metal radiator 4, the water inlet pipe 6 is connected to the steam trap 8 through a pipeline, and a water outlet pipe 7 is installed on the other side of the metal radiator 4, and the water outlet pipe 7 is connected to the water tank through a pipeline.

[0024] The steam trap 8 is connected to the steam heat exchanger in the dryer 1 through a pipeline to control the on-off between the steam heat exchanger in the dryer 1 and the metal radiator 4 to ensure the efficiency of waste heat recovery.

[0025] The air outlet of the automatic air valve 3 is provided with a sterilization device for sterilizing and disinfecting the heated air, so as to sterilize the heated air, ensure the cleanliness of the material entering the inner cavity of the dryer 1, and safely and reliably improve the quality of the finished product of the material.

[0026] like Figure 2 As shown, the metal primary filter 5 includes a filter housing 9, and a switch valve 10 is provided at the bottom of the filter housing 9. The initial state of the switch valve 10 is normally open. When the metal primary filter 5 is cleaned, in order to prevent liquid from entering the metal radiator 4, the switch valve 10 is closed. The upper end and side of the filter housing 9 are installed with a spray device 11. The spray device 11 is connected to a water tank, and the water tank is connected to a water storage tank 7. The condensed water after heat exchange is transported to the water tank. When the metal primary filter 5 is cleaned, the water in the water tank is used to save resources.

[0027] The switch valve 10 is an inclined switch valve, and a drain port 12 for draining water is provided at the bottom of the filter housing 9. The drain port 12 is located at the inclined lower end of the switch valve 10, both for quickly discharging the liquid during cleaning and accelerating the cleaning efficiency of the metal primary filter 5.

[0028] like Figures 3-4 As shown, the metal radiator 4 includes a radiator shell 13, in which a coil 14 is installed. One end of the coil 14 is connected to the water inlet pipe 6, and the other end of the coil 14 is connected to the water outlet pipe 7. The outer surface of the coil 14 is covered with cooling fins.

[0029] The radiator housing 13 is a surrounding housing and has an air inlet 15 and an air outlet 16 .

[0030] The coil 14 is composed of a plurality of rows of parallel spiral branches between air flow directions, and the number of rows can be increased or decreased as required.

[0031] Working process:

[0032] Step 1: The drying net in the dryer 1 drives the material to enter, the motor in the dryer 1 starts, and the material on the drying net is heated and dried. When the humidity in the drying part reaches the set value, the steam heat exchanger in the dryer 1 starts to discharge the condensed water (high temperature + liquid) with temperature in the dryer 1;

[0033] Step 2: At the same time, the automatic air valve 3 and the switch valve 10 are both opened. Due to the negative pressure effect (when the hot air in the cavity expands and a temperature difference is generated, a negative pressure area will be formed, and cold air will flow from the high-pressure area outside to the low-pressure area in the cavity to balance the pressure difference), cold air from the outside begins to replenish the inner cavity of the dryer 1, and the steam trap 8 between the dehumidification fan and the water inlet pipe 16 is opened. The warm condensed water discharged from the steam heat exchanger in the dryer 1 enters the metal radiator 4 through the water inlet pipe 6. The condensed water after heat exchange is discharged into the water tank from the water outlet pipe 7, and the cold air entering the metal radiator 4 is heated. The heated air passes through the sterilization device again and finally enters the inner cavity of the dryer 1, so that the air replenished into the inner cavity of the dryer 1 is hot air, realizing the utilization of waste heat.

[0034] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A Fourdrinier dryer with waste heat recovery, characterized in that: The invention comprises a dryer (1), wherein an air inlet (2) is provided on the top of the dryer (1), an automatic air valve (3) is installed on the air inlet (2), a metal radiator (4) is provided on the upper end of the automatic air valve (3), a water inlet pipe (6) is installed on one side of the metal radiator (4), the water inlet pipe (6) is connected to a drain valve (8) through a pipeline, and a water outlet pipe (7) is installed on the other side of the metal radiator (4), and the water outlet pipe (7) is connected to a water tank through a pipeline.

2. A Fourdrinier dryer with waste heat recovery according to claim 1, characterized in that: A metal primary filter (5) for filtering external cold air is installed above the metal radiator (4).

3. A Fourdrinier dryer with waste heat recovery according to claim 1, characterized in that: The steam trap (8) is connected to the steam heat exchanger in the dryer (1) through a pipeline.

4. A Fourdrinier dryer with waste heat recovery according to claim 1, characterized in that: The air outlet of the automatic air valve (3) is provided with a sterilization device for sterilizing and disinfecting the heated air.

5. A Fourdrinier dryer with waste heat recovery according to claim 2, characterized in that: The metal primary filter (5) comprises a filter housing (9), a switch valve (10) is provided at the bottom of the filter housing (9), a spray device (11) is installed at the upper end and the side of the filter housing (9), and the spray device (11) is connected to a water tank.

6. A Fourdrinier dryer with waste heat recovery according to claim 5, characterized in that: The switch valve (10) is an inclined switch valve, and a drain port (12) for draining water is provided at the bottom of the filter housing (9), and the drain port (12) is located at the inclined lower end of the switch valve (10).

7. The Fourdrinier dryer with waste heat recovery according to claim 1, characterized in that: The metal radiator (4) comprises a radiator shell (13), a coil (14) is installed in the radiator shell (13), one end of the coil (14) is connected to the water inlet pipe (6), the other end of the coil (14) is connected to the water outlet pipe (7), and the outer surface of the coil (14) is covered with cooling fins.

8. A Fourdrinier dryer with waste heat recovery according to claim 7, characterized in that: The radiator shell (13) is a shell surrounded by four sides, and the radiator shell (13) has an air inlet (15) and an air outlet (16).

9. A Fourdrinier dryer with waste heat recovery according to claim 7, characterized in that: The coil (14) is composed of a plurality of rows of parallel spiral branch pipes in the air flow direction.

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