RU2440538C1 - Outside condensation boiler - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: outside condensation boiler comprises a hydraulically and thermally insulated casing with an internal gas burner device, a heat exchanger with direct and return lines, a smoke stack, direct and return lines of a building heating system. Additionally it is equipped with a heat exchanger of a boiler's condensate part and a circulating pump, at the same time the heat exchanger of the boiler's condensate part is arranged in the lower part of the smoke stack and is connected to the return line of the building heating system and the return line of the boiler, and the circulating pump is installed in the return line of the building heating system with the possibility to provide forced circulation of coolant, besides, in parallel the heat exchanger of the boiler's condensate part is connected to direct and return lines of the boiler via check valves.

EFFECT: increased boiler capacity, higher efficiency due to additional energy capture during condensation of water vapours.

1 dwg

Description

FIELD OF THE INVENTION

The invention relates to the field of production of boilers for outdoor and indoor use, in particular to condensation boilers for outdoor use using the latent heat of vaporization of water vapor in flue gases due to the additional trapping of energy during condensation of water vapor.

State of the art

Known water-heating universal boiler installation, consisting of a water heating boiler containing a gas burner device, a gas duct, nozzles for heating and return water, an upper drum, in which a hot water supply system is mounted, made in the form of a multi-pass high-speed water-water heater containing bundles of brass tubes separated at the ends of the chamber and arranged sequentially from the bottom up (see US Pat. RF No. 2133925, class F24H 1/22, publ. 07.27.1999).

The disadvantage of this installation is the high cost of heat.

A known installation of hot water supply (options), comprising a hot water boiler with direct and return pipes connected to the heating system, a pipe for supplying cold tap water, a chimney, the lower part of which is made in the form of an economizer with direct and return pipes connected to a capacitive boiler, divided in two parts - upper and lower, and equipped with a hot water pipe, while the capacitive boiler and economizer are filled with tap water and form a natural circulation circuit of the heated water the flue gases of the boiler, while the mentioned cold water supply pipe is equipped with a capacitive boiler, the economizer is ring-shaped, the capacitive boiler is installed in the upper part of the economizer and divided into the two parts using a heater connected to the heating system, while the boiler is connected to the return and straight branch pipes of the economizer in the lower part.

A hot water supply installation, comprising a hot water boiler with direct and return pipes connected to the heating system, a cold water supply pipe, a chimney, the lower part of which is made as an economizer with direct and return pipes connected to a capacitive boiler, divided into two parts, top and bottom, and equipped with a hot water pipe, while the capacitive boiler and economizer are filled with tap water and form a water circulation circuit heated by the flue gas boiler, while the said cold water supply pipe is equipped with a boiler, the economizer is ring-shaped, the capacitive boiler is installed in the lower part of the economizer and is divided into the two parts by a heater connected to the heating system, the boiler is connected to the return and direct pipes of the economizer in the lower parts, on the pipeline connecting the lower part of the capacitive boiler with the return pipe of the ring-shaped economizer, a pump is installed, while the economizer and the capacitive boiler form Contours of forced circulation of water heated by the exhaust flue gas boiler (see. US Pat. RF №2230262, class F24H 1/48).

The disadvantage of this installation is the high cost of its production and the high cost of heat.

The closest in technical essence and the achieved positive effect and adopted by the author for the prototype is an outdoor condensation boiler, containing a thermally insulated casing with a thermally insulated vertical gas tube boiler with a gas burner, with a direct boiler pipe connected by an automatic thermostatic valve with a straight line to the building heating system , gas pipes with turbulators placed in them, a chimney, while in the smoke collector of the boiler an additional an additional heat exchanger in the form of a corrugated stainless steel pipe connected by one pipe to the return line of the heating system of the building, and the second pipe to the return pipe of the gas pipe boiler, the gas pipes containing turbulators with protective washers from condensate drops that are removed from the edges of the gas pipes by the arms of the turbulators, diameter which is equal to the gap between the protective washer and the edge of the gas pipe, and the base of the smoke collector contains a condensate drain pipe (see US Pat. RF №2333429, class F24H 1/00, publ. 10.09. 2008).

The disadvantage of this boiler is its low power due to the limited diameter of the corrugated pipes and the natural circulation of the coolant.

Disclosure of invention

The objective of the invention is the development of a condensation boiler for outdoor use, having an increase in boiler power through the use of forced circulation in the heating system while maintaining the natural circulation of the coolant in the condensing heat exchanger, to prevent it from thawing when the circulation pump stops, and increasing the efficiency due to additional energy recovery during condensation water vapor.

The technical result, which can be obtained using the present invention, is to increase the boiler power, increase efficiency due to additional energy capture during condensation of water vapor.

The technical result is achieved using an outdoor condensation boiler containing a thermally insulated housing with a gas burner inside, a boiler heat exchanger with direct and return lines, a chimney, a direct and return line of the building heating system, while it is additionally equipped with a condensate part of the boiler and a circulation pump while the heat exchanger of the condensate part of the boiler is located in the lower part of the chimney of the boiler and connected to the return line of the heating system the building and the boiler’s return line, and the circulation pump is installed in the return line of the building’s heating system with the possibility of providing forced circulation of the coolant, and, in parallel, the condensate heat exchanger of the boiler is connected to the direct and return lines of the boiler through non-return valves with a normally open passage with the possibility of natural circulation in two heat exchangers of the boiler when the circulation pump is stopped.

Brief Description of the Drawing

The drawing shows a condensation boiler for outdoor use, General view.

The implementation of the invention

The outdoor condensation boiler consists of an outdoor boiler 1, which contains a gas burner 2, a heat exchanger 3 with direct and reverse lines 4, 5, respectively, a chimney 6 in the lower part of which a heat exchanger 7 of the condensate part is installed, inside which a fairing 8 is installed, and the base of the chimney is installed a hatch 9 for cleaning soot, a condensate drain pipe 10, while the heat exchanger 7 is connected to the return line 5 through the valve 11 with a normally open passage, with a straight line 4 of the boiler 1 m of valve 12 with a normally open passage, and the building heating system contains a vertical riser 13 connected to a straight line 4 of boiler 1, a deaeration expansion tank 14, distributing risers 15 with heating devices 16, a return line 17 of the heating system, a circulation pump 18, mud filter 19, while the return line 17 of the building heating system is connected to the upper part of the heat exchanger 7 of the condensate part, and the lower part of the heat exchanger 7 is connected to the return line 5 of the boiler 1.

Condensing boiler outdoor placement works as follows.

The gas burner device 2, installed inside the boiler 1, generates heat, which is captured by the heat exchanger 3 of the boiler 1, while the exhaust gases are removed due to the natural draft of the chimney 6 into the atmosphere, and the flue gases wash the heat exchanger 7 of the condensate part, evenly distributed using the fairing 8, in this case, the coolant from the heat exchanger 3 of the boiler 1 enters in a straight line 4 of the boiler 1 into the vertical riser 13 and through the deaeration-expansion tank 14 into the distributing risers 15 of the building heating system with appliances 16, giving flat and cooled, the coolant on the return line 17 of the building heating system by the circulation pump 18 is fed through the mud filter 19 to the upper part of the heat exchanger 7, where it is heated by the exhaust flue gases and then goes to the return line 5 of the boiler 1, while, as the temperature in the heat exchanger 7 below the dew point, condensate forms on the surfaces of the heat exchanger 7 from corrugated stainless steel, which flows along the inner surface of the chimney 6, bypassing the heat exchanger 3 of boiler 1, enters the base of the chimney 6 and through the condensate drain pipe 10 is removed from the outdoor boiler 1, and during seasonal maintenance the soot is removed through the hatch 9 to clean the soot, while the circulating pump 18, under the pressure of the coolant, normally open passages of the valve 11 and valve 12 are closed and maintained in the closed position during the operation of the circulation pump 18, and when the circulation pump 18 stops, the circulation in the building heating system stops, valve 11 and valve 12 automatically open, the heat transfer from the heat exchange 3 boiler 1 through a straight line 4, valve 12, through a heat exchanger 7, valve 11 enters the return line 5 of boiler 1, forming a new natural circulation circuit, while the heat exchanger 7 is constantly heated by a gas burner device 2, which prevents it from defrosting, and when turning on the circulation pump 18 under the influence of circulation pressure, the valve 11 and valve 12 are automatically closed, the outdoor boiler 1 again works according to the main forced circulation circuit. Switching circuits occurs automatically without the intervention of staff.

The invention in comparison with the prototype and other known technical solutions has the following advantages:

- increase in boiler power due to the use of forced circulation in the heating system while maintaining the natural circulation of the coolant in the condensing heat exchanger in order to prevent it from thawing when the circulation pump stops;

- increase in efficiency up to 100% due to additional energy capture during condensation of water vapor;

- reducing the cost of the boiler by manufacturing it from traditional materials;

- cheaper heat production and lower cost of heating water.

Claims (1)

An outdoor condensation boiler comprising a thermally insulated housing with a gas burner inside, a boiler heat exchanger with direct and return lines, a chimney, a direct and return line of a building heating system, characterized in that it is additionally equipped with a condensate part of the boiler and a circulation pump, while the heat exchanger of the condensate part of the boiler is located in the lower part of the chimney of the boiler and is connected to the return line of the building heating system and the return line of the boiler, and the circulation pump is installed in the return line of the building heating system with the possibility of providing forced circulation of the coolant, and in parallel the heat exchanger of the condensate part of the boiler is connected to the direct and return lines of the boiler through non-return valves with normally open passage with the possibility of natural circulation in the two heat exchangers of the boiler when the circulation pump stops .

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