SU1257397A1 - Contact water heater - Google Patents

Description

The invention relates to a power system, and can be used to heat water 9 heat supply systems using contact devices.

The aim of the invention is to improve the reliability of the contact water heater by reducing the aerodynamic drag during variable operating conditions.

FIG. 1 shows a contact water heater, a longitudinal section; FIG. 2, a node I in FIG. 1;

The contact water heater contains a vertical case 1 with an upper outlet 1C m and a lower inlet duct 2 and 3, respectively. The inlet duct 3 communicates with the furnace 4, framed by a water jacket 5, equipped with a hydraulic lock 6 in the upper part. In the inlet duct 3, there is a fender visor 7 and a shell 8 forming a gap 9 with the walls of the housing 1. jacket 5. In housing 1 between gas ducts 2 and 3, consistently along the direction of the gases, a irrigation nozzle 10 with vertical gas pipes is installed

11 and nozzle 12 mounted over t

With this sprinkler 13, the pipes 11 are fitted with the lower closed ends and the lateral surface of the said pipes 11 is provided with perforations 14, the flow cross section of which is made increasing towards the open

the upper end of the pipe 11, on which are installed the visors 15,

Contact water heater works as follows.

The flue gases from the furnace 4 are directed to the inlet bottom gas duct 3, skirting the visor 7, are directed to the irrigated nozzles 10

12 and are removed from housing 1 through

the upper flue gas duct 2, the heated water is supplied through the irrigator 13 to the nozzle 12, from which the water is heated by the exhaust gases

the nozzle 10, where it is also heated by flue gases, and then through the gap 9 enters the water jacket 5 for subsequent reheating. From the water jacket 5 heated water through

hydraulic lock 6 is discharged to the consumer. From the nozzle 10, part of the gas penetrates into the gas passage pipes 11 through the perforation 14 in the walls and then exits through the upper open ends

pipe 11 into the gas space between the nozzles 10 and 12.

The amount of gases penetrating from the nozzle layer 10 into the gas transfer tubes 11 depends on the load of the water heater. At low loads, the aerodynamic resistance of the nozzle layer 10 is small and the amount of gases penetrating into the gas transfer pipes 11 is minimal. With an increase in the coolant flow rate, the aerodynamic resistance of the nozzle layer 10 also increases under the action of excessive static pressure that occurs when the nozzle is choked.

10, a correspondingly larger amount of gases rushes into the gas passage pipes 11. Due to the fact that the magnitude of the overpressure is greatest in the lower layers

the nozzle 10, the flow area of the perforation 14 in the walls of the pipe 11 is made variable. Inside the gas-by-pass pipes 11, there is also heat exchange between the gases and water irrigating the inner walls of the pipes 11.

Thus, the automatic adjustment of aero- is carried out. Mode of operation depending on the heat load of the water heater.

VNIIPI. Order 4904/35 Edition 589

Random polygons pr-tie, Uzhgorod, Proektna St., 4

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Claims (1)

A CONTACT WATER HEATER comprising a vertical casing with an upper · outlet and lower supply ducts, between which an irrigated nozzle is installed with vertical gas transfer pipes with open upper ends located in it, characterized in that, in order to increase reliability by reducing. aerodynamic drag under variable operating conditions, the lower ends of the gas transfer pipes are muffled, and the side surface of these pipes is provided with perforations, the passage section of which is made increasing towards the open upper end of the pipes. SU „„ 1257397