RU2242681C2 - Gas heater - Google Patents

Abstract

FIELD: fluid heaters having heat-generating means.

SUBSTANCE: gas heater has housing with the branch pipe for supplying heating fluid and branch pipe for discharging heated fluid, boiler with heated fluid which receives the furnace chamber with burner, which is in communication with the chimney and mounted at an inclination toward the top from the gas input. The heater has the contact chamber which is connected with the boiler and several additional furnace chambers with burners which are arranged vertically one above the other and made of a cylinder provided with corrugated sides, the corrugation ribs being screwed. A distance from the furnace chambers to the sides of the boiler is no more than 40% of the diameter of the furnace chamber. The burners are arranged at the bottom part of the furnace chambers and composed of two coaxial pipes with openings uniformly arranged in two rows along the pipes. The opening in the outer pipe are provided within the horizontal plane which is shifted down with respect to its axis by the value equal to approximately half radius of the pipe. The openings in the inner pipe are diametrically opposite in the vertical plane, and their diameter exceeds the diameter of the openings in the outer pipe by a factor of 3-4.

EFFECT: enhanced efficiency.

2 dwg

Description

The invention relates to a power system and can be used in heat supply systems as a heating gas unit.

Known contact-surface gas water heater containing a housing with nozzles for supplying and discharging water, in the housing there is a combustion chamber communicated in the upper part with a vertical bundle of exhaust gas heat exchangers, above which are placed the baffles and contact chamber (RF patent No. 2055274, IPC F 01 H 1/10, publ. 02.27.1996).

The known device has a complex and cumbersome design, large metal consumption.

Closest to the proposed is a horizontal heating boiler for working on liquid or gaseous fuel, containing a combustion chamber with a burner, equipped with a water jacket, in the upper part of which there are longitudinal channels for flue gases, connected to the combustion chamber using a bypass chamber, and the cross section of the furnace camera at its open end has an oval shape, gradually turning into a round at the closed end (USSR patent No. 290574, IPC F 01 H 1/00, publ. 12/22/1970).

This device also has a complex structure and low efficiency (efficiency) due to insufficient thermal conductivity and low efficiency of the combustion chamber.

The objective of the invention is to increase the efficiency due to uniform mixing of gas and air and optimize the movement of the flame in the combustion chamber with an increased contact surface with the coolant. In addition, the proposed technical solution is aimed at simplifying the design of the device and reducing its metal consumption.

The task is achieved by a heating gas unit containing a housing with a coolant supply pipe and a heated coolant discharge pipe, a boiler with a heated coolant, in which a combustion chamber with a burner is mounted, communicating with a chimney, in which, in contrast to the prototype, said combustion chamber is located at an angle upward from the gas inlet and at the same time the unit contains a contact chamber in communication with the boiler, as well as an additional several combustion chambers with burners, while the combustion chambers are located They are vertically stacked on top of each other and made in the form of a cylinder with corrugated walls with a screw arrangement of corrugation ribs, and the distance from the combustion chambers to the boiler walls is not more than 40% of the diameter of the combustion chamber, and the burners are located at the bottom of the combustion chambers and each consists of two coaxial tubes with holes evenly spaced in 2 rows along their length, the holes in the outer tube being made in a horizontal plane offset downward from its axis by an amount equal to about half the radius of the tube, and Stia formed in the inner tube is diametrically opposite in a vertical plane with a diameter of 3-4 times the diameter of the holes of the outer tube.

As a coolant can be used water or antifreeze.

Due to the system of openings, the proposed burner design ensures a uniform distribution of gas-air mixture in pressure and, accordingly, uniform combustion of gas.

Corrugated combustion chamber provides a large coefficient of heat transfer from the burner to the coolant due to the fact that the burner flame evenly covers and repeats the shape of the corrugation of the combustion chamber. In addition, mechanical reliability of the joints is ensured by compensating for elongation or compression. Due to the structural strength of the combustion chamber, the wall thickness is reduced by 3-4 times compared with the known version. This leads to an increase in thermal conductivity and, accordingly, to an increase in the efficiency

The vertical arrangement of the combustion chambers ensures rapid heating of the coolant by increasing the heating area and intensive circulation of the coolant through the boiler due to the large difference in pressure of the coolant in the boiler and in the system. Moreover, the agreed distance of the combustion chambers from the walls of the boiler no more than 40% is optimal due to considerations of the minimum dimensions of the unit and reduction of its metal consumption.

The presence in the proposed device of the return system to the boiler of the spent coolant through the contact chamber also leads to an increase in efficiency

The invention is illustrated by drawings. In Fig.1 shows a heating gas unit in section and a front view. Figure 2 shows schematically the movement of the gas-air mixture and flame inside the combustion chamber.

The heating unit contains a housing 1 with branch pipes 2 and supply coolant 3, a boiler with a heated coolant 4, a contact chamber 5, a combustion chamber 6 with gas burners 7. Gas burners are made in the form of coaxial tubes - external 8 and internal 9 with holes in each respectively 10 and 11 (figure 2). The unit also contains a chimney 12, communicating with the combustion chambers 6.

The system of holes in the tubes of the gas burner is as follows. The holes 10 in the outer tube 8 are made uniformly along the entire length in two rows in a horizontal plane offset from the tube axis by a distance equal to about half the radius of the tube. The diameter of the holes depends on the size of the burner and the combustion chamber and is 1-5 mm. The holes 11 in the inner tube 9 are also made 2 times diametrically opposite in the vertical plane, i.e. perpendicular to the plane of the holes of the outer tube. Their diameter in 3-4 rows exceeds the diameter of the holes of the outer tube.

The specified location of the holes and the ratio of their sizes increases the path of the gas-air mixture through the burner (figure 2), ensuring uniform burning along the entire length of the burner, and thus increasing the efficiency heating unit.

Each of the holes 10 of the outer tube is located opposite the outer ribs of the corrugation of the combustion chamber, which ensures that the flame flows around the corrugation surfaces and thus increases the area of heating of the coolant and, accordingly, the efficiency

The heating unit operates as follows.

The heating system is filled with a coolant, for example, water, which is supplied through the pipe 3 to the boiler 4, which communicates with the contact chamber 5. In the burners 7 of the combustion chambers 6, the gas supplied through the gas pipeline is ignited, which heats the coolant in the boiler through the corrugated walls. The gas combustion products enter the chimney 12. They are used for additional heating of the coolant in the contact chamber 5.

Due to the fact that the capacity of the contact chamber is much smaller than the capacity of the boiler, it warms up faster and the hot coolant moves from the contact chamber to the heating system, creating a pressure difference between the contact chamber and the boiler. Due to this, the rate of heat removal increases and, consequently, the efficiency of the heating gas unit increases.

The use of several combustion chambers located vertically one above the other ensures fast heating of the heat carrier in the boiler. In addition, due to the difference in pressure of the coolant along the height of the boiler, intensive circulation is carried out and heat transfer increases.

Thus, the proposed invention improves the efficiency heating gas unit, simplify the design, reduce metal consumption and significantly save natural gas consumption.

Claims (2)

1. A gas heating unit comprising a housing with a coolant supply pipe and a heated coolant drain pipe, a boiler with a heated coolant, in which a combustion chamber with a burner is connected to the chimney, characterized in that said combustion chamber is inclined upward from the gas inlet and the unit contains a contact chamber in communication with the boiler, as well as an additional several combustion chambers with burners, while the combustion chambers are arranged vertically one above the other and They are in the form of a cylinder with corrugated walls with a screw arrangement of corrugation ribs, and the distance from the combustion chambers to the boiler walls is not more than 40% of the diameter of the combustion chamber, and the burners are located at the bottom of the combustion chambers and each consists of two coaxial tubes with holes arranged in 2 rows along their length, and the holes in the outer tube are made in a horizontal plane offset downward from its axis by an amount equal to about half the radius of the tube, and the holes in the inner tube are made in diameter are completely opposite in the vertical plane with a diameter 3-4 times the diameter of the holes of the outer tube. 2. The unit according to claim 1, characterized in that water or antifreeze can be used as a heat carrier.

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