RU2561791C2 - Contact heat regenerator with drop catcher - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: invention relates to power engineering and can be used in units for water heating by waste combustion gases of boiler rooms or heat units. The contact heat regenerator with the drop catcher contains a contact nozzle with a sprinkler at the level of which the drop catcher comprising a branch pipe in the form of a barrel for discharge of the exchange medium is mounted. Heat exchange elements are located in rows at the level of the contact nozzle. In the barrel for discharge of heat exchange medium the bypass pipe is mounted. Between walls of the named barrel and the bypass pipe the circular gap is formed. The bypass pipe end faces towards the barrel bottom. From the barrel bottom the bypass pipe is fitted with a cap. Heat exchange elements are implemented hollow and filled with the flowing heat exchange medium. Cavities of heat exchange elements are interconnected both with the bypass pipe, and with the circular gap of the named discharge branch pipe. Cleaning of fine fogs to controlled residual concentration is performed.

EFFECT: high efficiency of catching of water vapour is provided.

2 dwg

Description

The invention relates to a power system and can be used in installations for heating water with flue gases from boiler rooms or thermal units.

Known contact heat exchanger containing a contact nozzle with a sprinkler, heat transfer elements, a droplet eliminator, a pipe for removing the heat transfer medium (Patent RU No. 2275559 C1. Publish. 04/27/06. Bull. No. 12).

In a known contact heat exchanger, the exhaust gases in the form of fog contain a significant amount of moisture. The droplet eliminator has significant hydraulic resistance due to the oversized nozzle volume. Due to condensate falling out of the fog on the pipe surfaces, cases of destruction of boiler chimneys are known.

Also known is a contact heat exchanger with a droplet eliminator, comprising a contact nozzle with an irrigator, the height of which is mounted a droplet eliminator, including a nozzle in the form of a cup for removing the heat transfer medium, heat exchange elements arranged in rows along the height of the contact nozzle and a bypass pipe placed in the said nozzle with the formation between them the walls of the annular gap, the end of which is facing the bottom of the glass (Patent RU No. 2431100 C2. Publish. 10.10.11. Bull. No. 28).

However, the known design has a limited core heat exchange mainly in the vicinity of the glass. The lack of cooling refrigerant circulation in the heat exchange elements limits the possibility of increasing the efficiency of the contact heat exchanger.

The objective of the invention is to increase the efficiency of contact heat recovery by intensifying heat and mass transfer and maximum condensation of water vapor during cooling through the nozzle.

The problem is achieved in that in a contact heat exchanger with a droplet eliminator containing a contact nozzle with a sprinkler, the height of which is mounted droplet eliminator, including a nozzle in the form of a glass for removal of the heat transfer medium, heat exchange elements arranged in rows along the height of the contact nozzle and placed in the bypass pipe with the formation between their walls of an annular gap, the end of which is facing the bottom of the glass, from the bottom of the glass the bypass pipe is equipped with a plug, and heat exchange elements are hollow, filled with flowing heat exchange medium, the heat exchange elements cavity communicated with both the bypass pipe and the annular gap of said transfer tube.

In FIG. 1 shows a contact heat exchanger; in FIG. 2 - a droplet eliminator is shown.

A contact heat exchanger with a droplet eliminator contains a vertical housing 1 with a lower nozzle 2 for supplying a heat-transfer medium and contact nozzles 3 and 4. An additional induction droplet 5 is mounted in the contact nozzle 4. A heat exchanger is equipped with a nozzle 6 for discharging cooled and purified gas. A sprinkler 7 is installed under the contact nozzle 4. An additional motive droplet eliminator 5 includes a discharge pipe 8 in the form of a glass for removal of the heat-transfer medium. An overflow pipe 9 is mounted in the outlet pipe 8 above its bottom with the formation of an annular gap 10 between their walls. The end of the bypass pipe 9, facing the bottom of the glass of the nozzle 8, is equipped with a plug 11. The bypass pipe 9 communicates at the inlet with a source of supply of refrigerant. Hollow heat-exchange elements 12 are mounted on a glass 8 and a bypass pipe 9 in staggered rows along the height of the nozzle 4. The cavities of the heat-exchange elements 12 filled with a flowing heat-exchange medium are in communication with both the bypass pipe 9 and the annular gap 10 of the aforementioned discharge pipe 8.

Heat exchanger works as follows. The heat exchange medium in the form of hot gas through the pipe 2 is fed into the housing 1. Entering the nozzle 3 of the heat exchange chamber, the hot gas gives off its heat to the water moving towards it. The humidified gas enters the nozzle 4, where moisture droplets are deposited, which trickles down into the heat exchange nozzle 3. The hollow heat exchange elements 12 immersed in the nozzle 4 by means of a heat exchange medium circulating in them (cooling refrigerant) take part of the heat from the moist gas and remove it through the annular gap 10 of the discharge pipe 8 from the heat exchanger. Ensuring the circulation of the cooling refrigerant enhances the outflow of heat from the nozzle 4 droplet eliminator. The regulation of the flow of refrigerant depending on the heat exchange processes in the nozzles 3 and 4 of the chambers 5 and 3 of the drop eliminator and heat transfer is provided by a valve 13. Cooled gas is discharged through the nozzle 6 through the nozzle 4. Cold water from the sprinkler 7 is supplied uniformly over the cross section of the housing 1.

The heat exchange elements are fastened in 12 rows along the height of the nozzle 4 of the droplet eliminator to the outlet pipe 8 to cool the nozzle and the moist gas passing through it. Ensuring the circulation of the refrigerant in the pipe 8 using the bypass pipe 9 enhances the outflow of heat from the moist gas to the nozzle 4 droplet eliminator. This contributes to the thermal condensation of submicron droplets of gaseous components during the cooling of the fog and the formation of a liquid film and its draining in the form of streams or enlarged droplets moving inside the nozzle under the action of gravity without any mechanical stress.

Thus, the high efficiency of trapping water vapor and the reliability of the apparatus is ensured by devices that are easy to manufacture and use. Fine mists are refined to an adjustable residual concentration. Placing hollow heat-exchange elements in the nozzle layer reduces its volume, which significantly reduces the hydraulic resistance of the apparatus. The combustion products are cooled to a temperature at which it is possible to condense the maximum possible portion of the water vapor contained in the gases and use the latent heat released during condensation.

Claims (1)

A contact heat exchanger with a droplet eliminator, comprising a contact nozzle with an irrigator, the height of which is mounted on a droplet eliminator, including a nozzle in the form of a cup for removing the heat transfer medium, heat exchange elements arranged in rows along the height of the contact nozzle, and an overflow pipe placed in the said nozzle to form an annular tube between their walls the gap, the end of which is facing the bottom of the glass, characterized in that on the side of the bottom of the glass bypass pipe is equipped with a plug, and the heat exchange elements filled with hollow, filled with flowing heat transfer medium, and the cavity of the heat exchange elements communicated with the bypass pipe, and with the annular gap of the said outlet pipe.

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