A heat recovery system for a main cable dehumidification system

Abstract

The present invention discloses a heat recovery system for a main cable dehumidification system. It includes a dehumidifier having a process air inlet, a process air outlet, a regeneration air outlet and a regeneration air inlet, and a first heat exchanger and a second heat exchanger interconnected by a joint pipe. The process air outlet of the dehumidifier is connected to the first heat exchanger through a process air outlet pipe, the regeneration air outlet of the dehumidifier is connected to the second heat exchanger through a regeneration air outlet pipe and the regeneration air can enter the first heat exchanger after passing through the second heat exchanger, the cold air outlet of the first heat exchanger is connected to a pressurized fan through a cold air outlet pipe, and the hot air outlet of the first heat exchanger is connected to the regeneration air inlet of the dehumidifier through a hot air outlet pipe. The advantages of the present invention are: the power of the dehumidifier heater is reduced, the process air is cooled by the regeneration air of a lower temperature, the heat generated by the dehumidification system is fully utilized, the energy loss and waste are reduced, and the operating cost is reduced.

Description

Technical Field

[0001] The invention relates to an auxiliary system of a main cable dehumidification device, in particular to a heat recovery system of a main cable dehumidification system, belonging to the technical field of main cable dehumidification. Background Art

[0002] For the dehumidification of the main cable of a suspension bridge, a dehumidification system is inevitably required. In the existing conventional dehumidification system for the main cable of a suspension bridge, the treated air is directly sent into the cooler by the blower, and then passed into the main cable after cooling; the regenerated air is passed into the heater in the dehumidifier for heating, and then directly discharged to the outside after passing through the rotor; although the existing structure can meet the treatment requirements, there is a serious energy loss in the entire treatment process, resulting in a waste of resources and high operating costs. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a heat recovery system for a main cable dehumidification system with small energy loss, less resource waste and low operating cost.

[0004] In order to solve the above technical problems, the heat recovery system of the main cable dehumidification system of the present invention includes a dehumidifier having a processed air inlet, a processed air outlet, a regeneration air outlet and a regeneration air inlet, and a first heat exchanger and a second heat exchanger interconnected by a joint pipe. The processed air outlet of the dehumidifier is connected to the first heat exchanger through a processed air outlet pipe, the regeneration air outlet of the dehumidifier is connected to the second heat exchanger through a regeneration air outlet pipe and can allow the regeneration air to enter the first heat exchanger after passing through the second heat exchanger, the cold air outlet of the first heat exchanger is connected to a pressurized fan through a cold air outlet pipe, and the hot air outlet of the first heat exchanger is connected to the regeneration air inlet of the dehumidifier through a hot air outlet pipe.

[0005] The bottom of the second heat exchanger is also provided with a discharge pipe for discharging liquid water and cooling air generated by heat exchange.

[0006] The regeneration air outlet pipe is provided with a drain pipe.

[0007] The hot air outlet and the cold air outlet of the first heat exchanger, the liquid water and cooling air outlet of the second heat exchanger, and the reserved detection joints are installed between the first heat exchanger and the second heat exchanger.

[0008] The outer walls of the treated air outlet duct, the regenerated air outlet duct and the hot air outlet duct are all covered with thermal insulation cotton.

[0009] The dehumidifier is a rotary dehumidifier.

[0010] The advantages of the present invention are: when the dehumidifier is working, the high-temperature processed air generated is passed into the first heat exchanger, and the cold air exchanges heat with the high-temperature and humid regeneration air in the second heat exchanger. The cold air enters the first heat exchanger after the first heating, and exchanges heat with the processed air in the first heat exchanger. After the processed air is cooled, it is sent to the main cable through the pressurized fan. The cold air enters the heater in the dehumidifier after the second heating. The cold air is preheated twice before entering the dehumidifier heater, which reduces the power of the dehumidifier heater. The processed air is cooled by the regeneration air with a lower temperature, which makes full use of the heat generated by the dehumidification system, reduces energy loss and waste, and reduces operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the heat recovery system of the main cable dehumidification system of the present invention. DETAILED DESCRIPTION

[0012] The heat recovery system of the main cable dehumidification system of the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0013] As shown in the figure, the heat recovery system of the main cable dehumidification system of the present invention is mainly used to cool the treated air of the rotary dehumidifier and to heat the regeneration air. It includes a dehumidifier 3 with a treated air inlet 6, a treated air outlet 2, a regeneration air outlet 4 and a regeneration air inlet 5, and a first heat exchanger 7 and a second heat exchanger 9 connected to each other through a joint pipe. The dehumidifier 3 is a rotary dehumidifier, and a heater is provided in the rotary dehumidifier. The treated air outlet 2 of the rotary dehumidifier is connected to the first heat exchanger 7 through the treated air outlet pipe 1. The treated air enters the rotary dehumidifier 3 from the treated air inlet 6, and the treated air generated by the rotary dehumidifier 3 comes out from the treated air outlet 2. , enters the first heat exchanger 7 through the pipe 1, the regeneration air outlet 4 of the rotary dehumidifier 3 is connected to the second heat exchanger 9 through the regeneration air outlet pipe 11 and can make the regeneration air enter the first heat exchanger 7 after passing through the second heat exchanger 9, the second heat exchanger 9 is provided with a cold air inlet on the left side (below) of the bottom, and the second heat exchanger 9 is provided with a liquid water and cooling air outlet on the right side (below) of the bottom, and the liquid water and cooling air outlet are connected to the discharge pipe 15 for discharging the liquid water and cooling air generated by the heat exchange, so that the regeneration air can exchange heat with the cold air in the second heat exchanger, and the cold air becomes the regeneration air after being heated and enters the first heat exchanger from the top of the second heat exchanger. In the first heat exchanger, the water and cooling air generated after the regeneration air is cooled are discharged from the lower right of the second heat exchanger. The high-temperature process air generated when the dehumidifier is working is introduced into the first heat exchanger. The cold air enters the second heat exchanger from the lower left of the second heat exchanger and enters the first heat exchanger from the top of the second heat exchanger. Heat exchange is performed with the process air in the first heat exchanger. The cold air outlet of the first heat exchanger 7 is connected to the pressurized fan 14 through the cold air outlet pipe 10. The process air is cooled in the first heat exchanger and then introduced into the pressurized fan. After the process air has a certain pressure, it is blown into the main cable for dehumidification. The hot air outlet of the first heat exchanger 7 is connected to the pressurized fan 14 through the hot air outlet pipe 12. The regeneration air inlet 5 is connected to the rotary dehumidifier 3. The regeneration air is preheated twice in the first heat exchanger and the second heat exchanger and then enters the heater in the dehumidifier from the regeneration air inlet of the dehumidifier. The regeneration air heated to a certain temperature by the heater is passed into the rotor in the dehumidifier to take away the moisture in the dehumidifier rotor. According to this working principle, the regeneration air is preheated twice before passing into the dehumidifier and then passed into the heater in the dehumidifier. After heating, it is passed into the rotor of the rotary dehumidifier and takes away the moisture in the rotor. The regeneration air with a relatively high temperature and humidity is cooled and then discharged, thereby making full use of the heat generated during the working process of the dehumidifier and reducing energy loss and waste.

[0014] Furthermore, a drain pipe 13 is provided on the regeneration air outlet pipe 11. At this time, after the regeneration air is heated and enters the dehumidifier, the regeneration air with a relatively high temperature and humidity coming out of the dehumidifier is passed through the regeneration air outlet pipe 11 of the dehumidifier into the second heat exchanger for heat exchange with the cold air. The liquid water and cooling air generated after the humid regeneration air is cooled are discharged into the air from the discharge pipe 15. The cold air is preheated for the first time in the second heat exchanger and becomes the regeneration air and is passed into the first heat exchanger, so that the regeneration air is preheated twice before entering the heater. A drain pipe 13 is provided at the pipe at the regeneration air outlet 4 for discharging the water generated by cooling in the regeneration air outlet pipe 11. The drain pipe 13, when the regeneration air with high temperature and humidity comes out from the regeneration air outlet 4 and enters the regeneration air outlet pipe 11, the moisture in the regeneration air encounters the pipe wall and is liquefied, and the liquid water is discharged through the drain pipe 13; the hot air outlet and cold air outlet of the first heat exchanger 7 and the liquid water and cooling air outlet of the second heat exchanger 9 and the joint pipes between the first heat exchanger 7 and the second heat exchanger 9 are installed with detection reserved joints 8 to detect whether the temperature of the air at each location meets the requirements. In addition, in order to ensure the adequacy of heat recovery, the outer walls of the process air outlet pipe 1, the regeneration air outlet pipe 11 and the hot air outlet pipe 12 are covered with thermal insulation cotton to reduce heat loss.

Claims

1. A heat recovery system for a main cable dehumidification system, characterized in that: The invention comprises a dehumidifier (3) having a process air inlet (6), a process air outlet (2), a regeneration air outlet (4) and a regeneration air inlet (5), and a first heat exchanger (7) and a second heat exchanger (9) which are interconnected via a joint pipe, wherein the process air outlet (2) of the rotary dehumidifier (3) is connected to the first heat exchanger (7) via a process air outlet pipe (1), the regeneration air outlet (4) of the dehumidifier (3) is connected to the second heat exchanger (9) via a regeneration air outlet pipe (11) and the regeneration air can enter the first heat exchanger (7) after passing through the second heat exchanger (9), a cold air inlet is arranged on the left side of the bottom of the second heat exchanger (9), and a liquid water and cooling air outlet is arranged on the right side of the bottom of the second heat exchanger (9), the cold air outlet of the first heat exchanger (7) is connected to a pressurized fan (14) via a cold air outlet pipe (10), and the hot air outlet of the first heat exchanger (7) is connected to the regeneration air inlet (5) of the dehumidifier (3) via a hot air outlet pipe (12).

2. The heat recovery system of the main cable dehumidification system according to claim 1, characterized in that: The bottom of the second heat exchanger (9) is also provided with a discharge pipe (15) for discharging liquid water and cooling air generated by heat exchange.

3. The heat recovery system of the main cable dehumidification system according to claim 1 or 2, characterized in that: The regeneration air outlet pipe (11) is provided with a water discharge pipe (13).

4. The heat recovery system of the main cable dehumidification system according to claim 3 is characterized in that: The hot air outlet and the cold air outlet of the first heat exchanger (7), the liquid water and cooling air outlet of the second heat exchanger (9), and a detection reserved joint (8) are installed between the first heat exchanger (7) and the second heat exchanger (9).

5. The heat recovery system of the main cable dehumidification system according to claim 1, 2 or 4, characterized in that: The outer walls of the treated air outlet duct (1), the regenerated air outlet duct (11) and the hot air outlet duct (12) are all covered with thermal insulation cotton.

6. The heat recovery system of the main cable dehumidification system according to claim 5, characterized in that: The dehumidifier (3) is a rotary dehumidifier.

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