RU2241902C1 - Fire-tube heating boiler burning gaseous and liquid fuels - Google Patents

Abstract

FIELD: water heating for communal and industrial services.

SUBSTANCE: boiler has cylindrical water-supply shell with butt-end tube sheets and setting that accommodates blind cylindrical flame box disposed on distant end of burner and secured in front tube sheet, as well as two runs of fire tubes arranged over concentric circumferences coaxial with flame box which are secured in holes of front tube sheet. Fixed in holes of rear tube sheet are second-run fire tubes only and those of first run are secured in holes disposed over periphery in rear part of flame tube, for instance by means of T-shaped adapters. First-run fire tubes have large diameter compared with that of second-run ones and they are uniformly arranged over circumference in water space; second-run fire tubes have smaller diameter than first-run tubes and are uniformly disposed over two circumferences between first-run tubes.

EFFECT: enhanced intensification of heat transfer and reduced size of boiler.

2 cl, 2 dwg

Description

The invention relates to boiler equipment and can be used in municipal and industrial energy.

Known heating boiler containing a rotary combustion chamber and the following hot gas path leading to the exhaust manifold (German patent No. 3509887, F 24 H 1/30, 09/25/1986).

The boiler according to the specified patent has low thermal efficiency of the combustion chamber due to the prohibitively high thermal voltage of the furnace volume, which is created by the reverse movement of the combustion products.

A heating boiler is known, comprising a cylindrical combustion chamber with a burner for liquid or gaseous fuel fixed in the front wall, located on the rear wall for the first turn to the second path, returning flue gases from the furnace chamber opposite the front wall, and the second turn near the front wall so that flue gases to the third path through the flue gas collection box and the chimney into the chimney (German patent No. 3904635, F 24 H 1/22, F 23 H 11/00, 03/15/1990).

The boiler according to the said patent has a low thermal efficiency of the convective gas duct, since the boiler has a stepwise heating of the heat carrier, which is characterized by a low temperature head in the last heat transfer path.

The objective of the invention is to increase the intensification of heat transfer in the boiler with a reduction in its dimensions.

The problem is solved due to the fact that the boiler contains a cylindrical water supply housing with end pipe boards and a lining, in the cavity of which there is a cylindrical blind chamber at the end remote from the burner, mounted in the front pipe plate, and two strokes of smoke tubes located in concentric circles coaxial with the fire chamber, and fixed in the holes of the front tube plate, while in the holes of the rear tube plate only smoke tubes of the second stroke are fixed, and smoke tubes ervogo turn secured in the holes located on the periphery in the rear part of the flame chamber. According to the invention, smoke tubes of the first stroke, fixed in the fire chamber by T-shaped transitions, have a larger diameter with respect to the pipes of the second stroke and are evenly spaced around the circumference in the water space, and smoke pipes of the second stroke have a smaller diameter with respect to the pipes of the first stroke and are uniformly arranged in two circles between the pipes of the first stroke.

Due to the fact that the smoke tubes of the first stroke, fixed in the fire chamber by T-shaped transitions, have a larger diameter relative to the pipes of the second stroke and are evenly spaced around the circumference in the water, and the smoke pipes of the second stroke have a smaller diameter and are evenly spaced along two circles between the pipes of the first stroke, an increase in the intensification of heat transfer in the boiler is achieved with a reduction in its dimensions.

Figure 1 shows a fire tube boiler for gaseous and liquid fuels.

In Fig.2 shows a section along BB of Fig.1.

The boiler (Fig. 1) consists of a horizontal cylindrical water supply housing 1 with end pipe boards and lining 2, a cylindrical blind at the end of the fire chamber 4 remote from the burner 3, located in the cavity of the housing 1 and fixed in the front tube board, smoke tubes 5 of the first stroke fixed on the one hand by T-junctions in the holes located on the periphery in the rear of the chamber 4, and on the other hand, in the holes of the front tube board, smoke tubes 6 of the second stroke, fixed on one side they are in the holes of the front tube plate, and on the other hand, in the holes of the rear tube plate. The boiler is also equipped with a rotary chamber 7 and a flue gas collection chamber 8, a flue gas removal pipe 9 from the boiler, a feed water fitting 10 and a hot coolant outlet fitting 11.

The boiler operates as follows.

After the boiler is completely filled with water through the burner 3, a fuel-air mixture is fed into the chamber 4, which is ignited by the electrode igniter integrated into the burner. The incandescent flue gases generated during the combustion process, moving towards the rear of the chamber 4, give up to 70% of the heat to the coolant and are sent through the T-shaped junctions to the smoke pipes 5 of the first stroke to the rotary chamber 7, from which the flue gases are sent to the smoke pipes 6 of the second stroke to the chamber 8 of the collection of flue gases and through the pipe 9 to remove flue gases from the boiler into the chimney. An increase in the heat transfer efficiency in the boiler occurs due to an increase in the temperature head during heat transfer in evenly spaced tubes 6 between the tubes 5 along concentric circles coaxial with the chamber 7, in which the flow of combustion products in one direction is organized. The supply of feed water to the boiler and the removal of the heated coolant from it are made through fittings 10 and 11, respectively.

Claims (2)

1. A fire-tube heating boiler for gaseous and liquid fuels, comprising a cylindrical water supply housing with end pipe boards and a lining, in the cavity of which there is a cylindrical blind chamber, fixed at the end of the burner, fixed in the front pipe plate, and two smoke pipe strokes located along concentric circles, coaxial with the flame chamber, and fixed in the holes of the front tube plate, and in the holes of the rear tube plate only smoke tubes of the second stroke are fixed and the smoke pipes of the first stroke are fixed in the holes located at the periphery in the rear part of the fire chamber, characterized in that the smoke pipes of the first stroke have a larger diameter relative to the pipes of the second stroke and are evenly spaced around the circumference in the water space, and the smoke pipes of the second stroke have a smaller relative to the pipes of the first stroke, the diameter and are evenly spaced along two circles between the pipes of the first stroke. 2. The boiler according to claim 1, characterized in that the smoke tubes of the first stroke are fixed in the fire chamber by means of T-shaped transitions.

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