RU15779U1 - WATER BOILER - Google Patents

Abstract

1. A water boiler containing a firebox formed by pipes arranged for concentrating on a network for heating network water, connected at one end to an inlet ring collector, and the other to an output ring collector, an air heater enclosing the furnace, made in the form of two coaxially mounted cylinders forming each other an annular channel for supplying air to the furnace, an air supply chamber, the cavity of which is in communication with the annular channel of the air heater, and a flue gas exhaust chamber, communicating It is equipped with a furnace, characterized in that it is equipped with heat transfer elements in the number of pipes for heating the network water, each of which is made in the form of a hermetically closed cylindrical casing mounted on the pipe, forming a closed annular cavity filled with deaerated condensate around it. 2. The boiler according to claim 1, characterized in that at least one heat transfer element from the side of the heater is equipped with a thermocouple mounted on its outer surface.

Description

OBJECT-USEFUL MODEL MPK7 F 24H 1/00 WATER BOILER

The utility model relates to heat engineering, namely, to water boilers A working on liquid and gaseous fuels, and can be used for heating residential and industrial buildings.

A well-known boiler containing a furnace with a heating surface connected to a remote cyclone, and a convective shaft with a heating surface connected to pipelines for the discharge of network water. In this case, the boiler is equipped with an additional heat exchanger with heated and heating paths, the first of which is included in the cut of the mains water pipeline, and the second is connected to an external cyclone with the formation of a natural circulation loop (see autost.SSSR No. 1657852, MKI5 F 22B 33/18 )

A disadvantage of the known boiler is the reduced efficiency of heat transfer between flue gases and heated mains water, due to the low temperature pressure in the convection shaft, which requires heating of the mains water in an additional heat exchanger. In addition, the presence of a convective shaft with a heating surface located in it leads to a significant increase in the hydrodynamic resistance of the gas path.

The closest analogue to the claimed object is a hot-water boiler containing a firebox made of pipes installed to concentrate on the concentric circle for heating network water, connected at one end to an inlet ring collector and the other to an output ring collector, connected to an air supply pipe, an air heater made in in the form of two coaxially mounted cylinders covering the firebox and forming an annular gap around it for supply

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air to the furnace, and a flue gas exhaust chamber that communicates with the furnace (see. St. St. USSR # 342020, MKHF24 H 1/00, F22B 33/18).

The disadvantages of the known boiler is the constant decrease in heat transfer coefficient during operation due to the continuous increase in thermal resistance due to salt deposition and the possibility of burning the heating surface due to the high temperature pressure between the combustion products and heated mains water.

The utility model is based on the task of developing a design of a hot water boiler with such a heating surface that would ensure a high heat transfer rate when heating network water by preventing salt deposits on its internal surfaces and burning out the heating surface material.

The problem is solved in that the well-known hot water boiler, comprising a firebox formed by pipes arranged to concentrate on a concentric circle for heating network water, connected at one end to an inlet ring collector, and the other to an output ring collector, an air heater enclosing the furnace, made in the form of two coaxially installed cylinders forming an annular channel for supplying air to the furnace, an air supply chamber, the cavity of which is in communication with the annular channel of air heating According to the change, according to the change, the number of pipes for heating the network water is provided with heat transfer elements, each of which is made in the form of a hermetically closed cylindrical casing mounted on the pipe, forming around it a closed annular cavity filled with diaererically condensed.

3.

In addition, at least one heat transfer element on the side of the heater is equipped with a thermocouple mounted on its outer surface.

The essence of the utility model is illustrated by drawings, where in FIG. 1 shows a General view of the boiler, a longitudinal section; figure 2 is a section along aa in fig. 1; on Fig.Z is a General view of the heat transfer element, a longitudinal section.

The hot water boiler contains a furnace 1 (Fig. 1,2) with a lined hearth 2 (Fig. 1) and an air heater 3 (Fig. 1,2).

The furnace 1 is formed by pipes 4 installed in a concentric circle (Fig. 1-3) for heating the mains water, connected at one end to the inlet ring collector 5 (Fig. 1) of the mains water, and the other to the outlet ring collector 6 of the mains water. Collector 5 is equipped with a pipe for supplying 7 network water, and a collector 6 with a pipe for withdrawing 8 network water into the heating system (not shown in the figure). The boiler is equipped with the number of pipes 4 for heating the network water with heat transfer elements, each of which is made in the form of a hermetically closed cylindrical casing 9 installed on the pipe 4 for heating the network water (Fig. 1-3), forming an annular cavity 10 around the pipe 4 filled with deaerated condensate. An opening 11 is made in the casing 9 (FIG. 3) for filling the annular cavity 10 with deaerated condensate. The hole 11 is sealed in any known manner after filling the cavity 10 with condensate.

The air heater 3 (Fig. 1,2) is made in the form of coaxially mounted external 12 and internal 13 cylinders, covering the firebox 1 and forming an annular channel between them for supplying air to the firebox 1. The cavity of the annular channel of the air heater 3 is in communication with the chamber cavity air supply 14 (figure 1).

4.

The lower part of the outer cylinder 12 of the heater 3 is supported on the casing 15 (figure 1), and the inner cylinder 13 is on the annular frame 16 with windows 17 for supplying air, located between the lined hearth 2 of the furnace 1 and the casing 15.

A hearth burner 18 is installed in the hole 19 of the hearth 2 of the furnace 1. The end of the pipe 7 for supplying network water to the inlet annular manifold 5 is brought into the lining cavity 15. In the upper part of the boiler above the furnace 1, a chamber 20 for flue gas removal is placed.

To control the thermal regime of the heat transfer elements, at least one of them is equipped with a thermocouple 21 (Fig. 1,3), which is installed on the outer surface of the casing 9 in its upper part. Moreover, the thermocouple 21 is placed on the side of the inner cylinder 13 of the air heater 3. The maximum number of thermocouples 21 may correspond to the number of heat transfer elements.

In the claimed design of the boiler can be used any known thermocouples, for example, chromel-aluminum (see Osipova VA Experimental study of heat transfer processes, M., Energy, 1979, S. 10).

WATER BOILER OPERATES AS FOLLOWING

A blow fan (not shown in the drawing) air is supplied to the air supply chamber 14 (Fig. 1), from which it enters the air heater 3, where, moving along the annular channel formed by the outer 12 and inner 13 cylinders, it is heated by transferring through the wall of the inner cylinder 13 the heats of the high-temperature combustion products generated in the furnace 1. Heated air through the windows 17 in the annular frame 16 enters through the opening 19 of the hearth 2 to the hearth burner 18, mixes with the fuel sprayed by the burner 18 and enters the furnace 1, providing Cooking fuel combustion in the latter.

At the same time, the high-temperature combustion products formed in the furnace 1 transfer their heat by convection and radiation in two directions: the walls of the casings 9 of the heat transfer elements and the walls of the inner cylinder 13 of the air heater 3. After that, the combustion products through the flue gas exhaust chamber 20 enter the atmosphere.

Mains water through the supply pipe 7 (Fig. 1) enters the inlet manifold 5, from which it is evenly distributed through pipes 4, where it is heated by the heat taken from the combustion products, as follows.

The heat removed from the combustion products through the walls of the casings 9 (Fig. 1-3) is transferred to the deaerated condensate located in the hermetically sealed annular cavities 10 formed around the pipes 4 for heating the network water. In this case, the deposition of salts on the inner surfaces of the shells 9, and, consequently, an increase in their thermal resistance does not occur, since salts are almost completely absent in the deaerated condensate (see The absence of salt deposition also prevents local burning of the materials of the wall of the shells 9. Heat transfer from the deaerated condensate to the walls of the pipes 4, and then to the heated network water, occurs at a much lower level of the wall temperature, the upper limit of this temperature is determined by the saturation pressure water vapor in the internal cavities 10 of the heat transfer elements and is controlled by thermocouple 21. At this temperature level, salts are not deposited on the inner surface of the pipes 4 in contact with the heated network water, all of which leads to an increase in the intensity of heat transfer during heating of the water.

The network water heated in this way is fed into the output manifold 6, from which it is supplied through the branch pipe 8 to the consumer’s heating network.

taking place in the solution - the prototype, which is confirmed by an example of a specific implementation. Accordingly, the claimed design of the boiler can be widely used for heating residential and industrial buildings in both urban and rural areas, and therefore meets the condition of industrial applicability.

Claims (2)

1. A water boiler containing a firebox formed by pipes arranged for concentrating on a network for heating network water, connected at one end to an inlet ring collector, and the other to an output ring collector, an air heater enclosing the furnace, made in the form of two coaxially mounted cylinders forming each other an annular channel for supplying air to the furnace, an air supply chamber, the cavity of which is in communication with the annular channel of the air heater, and a flue gas exhaust chamber, communicating It is equipped with a furnace, characterized in that it is equipped with heat transfer elements in the number of pipes for heating the network water, each of which is made in the form of a hermetically closed cylindrical casing mounted on the pipe, forming a closed annular cavity filled with deaerated condensate around it. 2. The boiler according to claim 1, characterized in that at least one heat transfer element from the side of the heater is equipped with a thermocouple mounted on its outer surface.