Air cooler with external recirculation

 

(57) Abstract:

The invention is intended for use in the chemical, oil, gas and other industries for cooling products, the change in the low temperature state to a solid phase or forming solid chemical compounds. The unit contains a heat exchange section, the recirculation channel and placed underneath the mixing chamber of warm and cold air. In the upper part of the mixing chamber under heat exchange section is offset in the direction opposite to the recirculation channel, a reservoir placed in it by the fan. In place of the message camera with recirculation channel on the walls of the fixed plate trapezoidal forms, one of which is inclined in the direction of the fan, and the other two in the direction of the recirculation channel. The presence, size and specific angle of inclination of the plates allow to thoroughly mix the nonuniform air flow. The invention provides increased reliability of operation of the apparatus, increases the cooling efficiency of the product by maintaining the temperature of all heat exchanger walls above the hydrate formation temperature. 2 Il.

The invention of otnositelnosti for cooling products when lowering the temperature within the operating range change state to a solid phase or form a solid chemical compounds.

Known design air cooler with external recirculation (brochure of the firm "Batignolles technologies thermiques (Btt)", France, the exhibition "Neftegaz - 89), in which there is a channel on the outside relative to the compartment of the heat exchanger. Through this channel provide external circulation warmed tube bundle air directed under the fan, located in the compartment of the heat exchanger. On the other hand under the fan is served cold air.

The disadvantage of this apparatus is that practically no mixing of cold and warm air, resulting in a flow of cold air sent by the fan in the tube bundle, which negatively affects the operation of the air cooler.

The famous design of the air cooling external air recirculation - (prototype) (Winterizingair cooled heat exchanders, Frank L. Rubin. Hidrocarbon processing. October, 1980, vol. 59, No. 10, p. 149), in which there is a channel on the outside relative to the compartment of the heat exchanger. Through this channel have foreign the distance for the movement of the mixed flow is created upper inlet for cold air, and narrowing at the exit of the channel accelerates additional mixing of air directed under the fan, located in the compartment of the heat exchanger. In this system does not take the contact of cold air with the surface of the pipe.

The disadvantage of this apparatus is insufficient mixing of cold and hot air, which flows insufficiently warmed air sent by the fan at the far end of the tube bundle, which negatively affect the reliable operation of the air cooler.

The aim of the invention is to improve the reliability design of the air cooler, ensure the stable operation of the air tract system and improving the efficiency of cooling of the product.

This objective is achieved in that the air cooling external air recirculation, consisting of the coil, fan, recirculation channel and blinds for entry and exit of air under the heat exchange section and a recirculation channel posted a mixing chamber provided with a recirculation channel, while in the upper part of the mixing chamber under heat exchange section is offset to the side, against the I with a recirculation channel, a mixing chamber provided with plates of trapezoidal shape with a width, equal to 0.25 - 0.40mm width of the heat transfer section, fixed her large grounds on the lower parts of the walls of the recirculation channel, the average plate mounted on the wall that separates the recirculation channel from the heat transfer section, with a slope angle of 40 - 50oin the direction of the fan, and the other two adjacent walls with a slope angle of 40 - 50oin the direction of the recirculation channel.

Accommodation in an air cooler with external recirculation of air at the heat exchange section and a recirculation channel mixing chamber provided with a recirculation channel, the location of the fan in the collector, which is installed in the upper part of the mixing chamber under heat exchange section is offset in the direction opposite to the recirculation channel, and the supply of the mixing chamber in place of a message with a recirculation channel plates trapezoidal shape with a width equal to 0,25 - 0,40 width of the heat transfer section, fixed her large grounds on the lower parts of the walls of the recirculation channel, and the average plate mounted on the wall that separates the recirculation channel from the heat transfer section, with an inclination angle of 40 - 50otowards the blower adjust is Alilo to carry out a more thorough mixing of cold and hot air, thereby ensuring reliable operation of the device at low temperatures. The proposed design has improved the reliability of the air cooling unit, to ensure the stable operation of the air tract system and to improve the cooling efficiency.

The applicant does not know of the air cooling apparatus with the external air circulation, in which the alignment of the temperature field is done the same way.

In Fig. 1 presents a diagram of the apparatus for air cooling external air recirculation.

In Fig.2 - section a - a in Fig. 1.

Air cooler with external recirculation consists of a casing 1 in which is installed a heat-exchange section 2, fan 3 drive 4 and the recirculation channel 5, the wall 6 separates the recirculation channel 5 from the heat transfer section 2. The heat exchange section 2 is provided with channel 7. The mixing chamber 8 is located in the body 1 under the channel 7 of the heat exchange section 2 and a recirculation channel 5 and is communicated with the lower part of the recirculation channel 5. In the upper part of the mixing chamber 8 is the collector 9 is shifted to the wall 10 of the housing 1. In the reservoir 9 is the fan wheel 3. and 12 wide, equal to 0.25 - 0.40mm width of the heat transfer section 2, fixed her large grounds on the lower parts of the walls of the recirculation channel 5. Plate 11 having the shape of an isosceles trapezoid, with its large base mounted on the bottom wall 6 of the recirculation channel 8 with a slope angle of 40 - 50oin the direction of the fan 3. The other two plates 12 having the shape of a rectangular trapezium, fixed on the lower parts of the connecting wall 6 of the front and rear walls of the recirculation channel 5 with a slope angle of 40 - 50oin the direction of the recirculation channel 5. The sides of the plates 12 secured to the wall 13 of the housing 1. The unit is equipped with a system of shutters 14, 15 for exit of heated air from the heat exchange section 2 and 16 for the entrance of cold air into the recirculation channel 5.

Air cooler with external recirculation operates as follows.

The air blowing fan 3, blows pipe heat transfer section 2 and cools the transferred product. At the outlet of the heat exchange section 2 some of the heated air is removed from the apparatus through the louvers 14, and part through the louvers 15 enters the recirculation channel 5. From the opposite side through the louvers 16 in resenje hot and cold air flows, but, because the penetration is large jets, these patterns of distribution of velocities are stored for each of these flows across the path of the recirculation channel 5. This means that at the outlet of the recirculation channel 5 contents hot air is increased from the side wall 13, and a cold-side wall 6. In the mixing chamber 8, a vacuum sufficient to suction inhomogeneous flow of air from the recirculation channel 5. Non-uniform flow of air entering into the mixing chamber 8, changes the direction of movement of the 90o.

With the plates 12, installed in the mixing chamber 8 and is fixed on the lower parts of the walls of the recirculation channel with a slope angle of 40 - 50oin the direction of the recirculation channel 5, is made by mixing non-uniform flow of air coming from the recirculation channel 5 over the width of the mixing chamber 8. And installed in the mixing chamber 8 plate 11 mounted in the bottom wall 6 of the recirculation channel 5 with a slope angle of 40 - 50oin the direction of the fan 3, restricts the passage of air flow is non-uniform patterns in the fan and provides mixing of the heterogeneous flow PE mixing 8 coming from the recirculation channel 5 non-uniform air flow.

The air flow is aligned with the temperature field across the cross-section of the mixing chamber 8 near wall 10 makes a sharp turn and passes through the fan 3 with velocity vector directed at some angle to the axis of the fan, thereby forming an area of high pressure near the wall 6 of the channel 7 of the heat exchange section 2 and low around the wall 10. The maximum reduction in pressure occurs in the zone of action of the vortex formed in the space channel 7 over the Central part of the fan wheel 3. The alignment of the velocity field in the channel 7 is carried out by displacement of the collector 9 with fan 3 installed in the mixing chamber 8 on the side wall 10. It is possible to increase the cooling efficiency of the product.

Thus, the proposed design of the air cooling external air recirculation possible to increase the reliability of the air cooling unit, to ensure the stable operation of the air tract system and to improve the cooling efficiency of the product by performing the mixing chamber with thorough mixing hot and cold air to maintain the temperature of the walls of all the heat exchange tubes above the hydrate formation temperature.

 

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