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System and method for recycling hot air of closed dry air cooler

An air cooler, closed technology, applied in the direction of combustion method, burner, combustion type, etc., can solve the problems of thermal energy waste, thermal pollution, etc., and achieve the effect of improving thermal efficiency, realizing waste heat utilization, and increasing temperature

Pending Publication Date: 2022-04-22
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the convective heat transfer coefficient of the air, fins are generally arranged outside the tube to improve the heat transfer performance, and the high-temperature air after heat exchange is directly discharged into the atmosphere, resulting in waste of heat energy and a certain degree of heat pollution to the surrounding air environment

Method used

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  • System and method for recycling hot air of closed dry air cooler
  • System and method for recycling hot air of closed dry air cooler

Examples

Experimental program
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Effect test

Embodiment 1

[0027] see figure 1 , the present invention provides a system for recycling hot air from a closed dry air cooler, including a closed dry air cooler, an induced draft fan 7, a gas heating furnace 10, and a gas preheater 13; the closed dry air cooler The bottom of the device is connected to the atmosphere, and the top outlet is connected to the inlet of the induced draft fan 7; the outlet of the induced draft fan 7 is divided into two routes, one of which is connected to the shell side inlet of the gas preheater 13, and a preheater inlet butterfly valve 9 is set between them. , the shell outlet of the gas preheater 13 communicates with the atmosphere through a pipeline; the other channel communicates with the inlet of the convection section of the gas heating furnace 10, and a heating furnace inlet butterfly valve 8 and a heating furnace air flow meter 16 are arranged therebetween; the outlet of the convection section passes through The pipeline is connected to the gas inlet of ...

Embodiment 2

[0032] see now figure 2 A method for recycling hot air from a dry air cooler, comprising the following steps:

[0033] Step S1, fully open the air-cooling and venting butterfly valve 6, start the air-cooling fan 1, run the closed dry air cooler, and then use the fin heat exchanger 3 to feed the material to be cooled at about 100-120°C from the material to be cooled into the pipeline 5 It is introduced from the upper tube side of the finned heat exchanger 3, exchanges heat with the air from the air-cooling fan 2, and is drawn out from the lower tube side of the finned heat exchanger 3, so that the temperature drops below 40°C;

[0034] Step S2, closing the inlet butterfly valve 8 of the gas heating furnace, opening the inlet butterfly valve 9 of the gas preheater, starting the induced draft fan 7, and gradually closing down the air-cooling and venting butterfly valve 6; on the premise that the induced draft fan 7 operates normally, keep the outlet pressure basically unchanged,...

Embodiment 3

[0040] see now figure 2 A method for recycling hot air from a dry air cooler, comprising the following steps:

[0041] Step S1, before operation, fully open the air-cooling vent butterfly valve 6, start the air-cooling fan 1, run the closed dry air cooler, and then use the fin heat exchanger 3 to cool the material from the pipeline 5 at about 100°C The material is introduced from the upper tube side of the fin heat exchanger 3, exchanges heat with the air from the air-cooling fan 2, and is drawn out from the lower tube side of the fin heat exchanger 3, so that the temperature drops below 40°C;

[0042] Step S2. Close the inlet butterfly valve 8 of the gas heating furnace, open the inlet butterfly valve 9 of the gas preheater, start the induced draft fan 7, gradually close the air-cooling and venting butterfly valve 6, and introduce the hot air (60-90°C) after the heat exchange of the air cooler into the induction fan. Fan 7 inlet; on the premise that the induced draft fan 7 ...

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Abstract

The invention belongs to the field of waste heat recovery, and provides a closed type dry air cooler hot air recycling system which comprises a closed type dry air cooler, an induced draft fan, a fuel gas heating furnace and a fuel gas preheater. The invention discloses a method for recycling hot air of a closed type dry air cooler. The method comprises the following steps that S1, the dry air cooler operates; s2, an induced draft fan runs; s3, the fuel gas heating furnace operates; s4, combustion-supporting gas air conditioning; hot air is introduced into the fuel gas heating furnace through air extraction, fuel gas is preheated, the hot air is used as combustion-supporting gas of the heating furnace, the air temperature of the fuel gas and the combustion-supporting gas is increased, waste heat utilization can be achieved, the heat efficiency of the heating furnace can be improved, fuel consumption can be reduced, and meanwhile heat pollution to the environment is relieved.

Description

technical field [0001] The invention belongs to the field of waste heat recovery, and in particular relates to a system and method for recycling hot air of a closed dry air cooler. Background technique [0002] Air coolers are the most widely used heat exchange equipment for condensation and cooling in petrochemical and oil and gas processing industries. They are generally composed of tube bundles, tube boxes, fans, louvers and frames. They can be divided into dry air coolers and wet air coolers. Air coolers, and dry air coolers are the most widely used. The dry-type air cooler is blown by a fan to blow high-temperature pipes to exchange heat through air. The air goes outside the pipes, and the cooled medium goes inside the pipes. In order to improve the convective heat transfer coefficient of the air, fins are generally arranged outside the tube to improve the heat transfer performance, and the high-temperature air after heat exchange is directly discharged into the atmosp...

Claims

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Application Information

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IPC IPC(8): F23D14/66
CPCF23D14/66Y02E20/34
Inventor 胡廷平
Owner WUHAN POLYTECHNIC UNIVERSITY