RU234383U1 - FIRE-TUBE BOILER FOR HEATING AND HOT WATER SUPPLY - Google Patents

Abstract

The utility model relates to heat power engineering, namely to fire-tube boilers, and can be used for heating residential and industrial premises and for extracting hot water for domestic needs. A fire-tube boiler for heating and hot water supply includes: a sealed hydraulic casing containing a combustion space; a fire-tube convective heat exchanger of the heating circuit; a liquid coolant of the heating circuit; a heat exchanger of the hot water supply (HWS) circuit, located in the circulation volume of the liquid coolant of the heating circuit; branch pipes of the heating and hot water supply systems. The casing contains a door with a fitting for connecting a gas burner, and the heat exchanger of the HWS circuit is a removable module made with the possibility of a hermetically sealed connection to the boiler casing by means of a detachable flange joint and including: a package of U-shaped pipes, a manifold, branch pipes for inlet and outlet of water of the hot water supply circuit. The technical result is an increase in the maintainability of the heat exchanger of the hot water supply circuit of the boiler for heating and hot water supply. 3 pts. f-ly, 1 ill.

Description

The utility model relates to thermal power engineering, namely to fire-tube boilers, and can be used for heating residential and industrial premises and for the extraction of hot water for domestic needs.

A boiler is known comprising an outer and an inner casing with covers, connected by a common bottom, a branch pipe for connecting to a chimney and shells for installing and securing doors equipped with screens and locking devices. The firebox is equipped with grates for burning solid fuel, and a gas burner device can be used for burning natural gas. Hot water sections are inclined in the upper part of the firebox in the side walls of the inner casing. When the boiler is operating, gases sequentially wash each hot water section (RU Patent No. 2080522 for the invention "HOT WATER STEEL BOILER", IPC F24H 1/00, published on 27.05.1997). The known boiler is intended for heating residential premises and does not provide for the selection of hot water for household needs.

A boiler is known for heating residential and industrial premises and hot water supply. The boiler comprises a body in the form of a water jacket framing a firebox and a flue gas duct equipped with hollow partitions and forming a labyrinth gas channel in the flue gas duct. A cavity is installed at the bottom of the firebox, forming a closed volumetric circuit of the heat-transfer medium with the coolant circuit. The heating surfaces are made in the form of heat exchange elements. A water heating element for hot water supply is installed in the upper part of the coolant jacket (RU Patent No. 2122688 for the invention "HEATING BOILER", IPC F24H 1/00, published on 27.11.1998). The known boiler is characterized by low maintainability, complexity of operation and maintenance of the heating element for hot water supply.

A boiler for hot water supply and heating is known, comprising a housing, a combustion chamber located in the housing with the formation of a water jacket between them, a cold (return) water supply pipe and a burner device, which are located in the lower part of the water jacket and the combustion chamber, respectively, a hot water outlet pipe and a smoke exhaust pipe, wherein in the lower part of the combustion chamber above the burner device a heat exchanger is installed in the form of a bundle of pipes, located at an angle and fixed at both ends in the corresponding opposite walls of the combustion chamber with the formation of inlet and outlet collectors, respectively, wherein the inlet collector is located lower than the outlet and is connected to the water jacket, and the outlet collector is connected to the hot water outlet pipe, wherein above the bundle of pipes an additional heat exchanger is placed for the utilization of the residual heat of the flue gases (RU Patent No. 2273802 for the invention "WATER HEATING BOILER", IPC F24H 1/44, published. 10.04.2006). The boiler of this design is characterized by increased metal consumption and low maintainability.

A fire-tube boiler for heating and hot water supply of apartments in multi-story residential buildings and individual residential buildings is known to be the closest in terms of the set of essential features and has been selected as a prototype. The known boiler includes a sealed hydraulic casing containing a combustion space; a fire-tube convective heat exchanger of the heating circuit; a liquid coolant of the heating circuit; a heat exchanger of the hot water supply (HWS) circuit, located in the circulation volume of the liquid coolant of the heating circuit; branch pipes of the heating and hot water supply systems, including branch pipes for the supply and discharge of the liquid coolant of the heating circuit, branch pipes for the supply and discharge of water of the hot water supply circuit, a branch pipe for the discharge of combustion products; a gas burner, a branch pipe for supplying air to the furnace to the gas burner and an automatic control system connected to the gas burner located in the cavity formed by the lower wall of the convection channels and the inner walls of the heat exchanger (RU Patent No. 88113 for the utility model "WATER HEATING BOILER", IPC F24H 1/08, published on 27.10.2009). The known boiler is also characterized by low maintainability of the hot water supply circuit, the malfunction or breakdown of which will entail the need to dismantle and then install the boiler lining, screens and pipes of the water-tube boiler.

The task that the claimed technical solution is aimed at solving is the creation of an efficient boiler for heating and hot water supply.

The technical result achieved as a result of solving the set task consists in increasing the maintainability of the heat exchanger of the hot water supply circuit of the boiler for heating and hot water supply.

The specified technical result is achieved in that the fire-tube boiler for heating and hot water supply includes: a sealed hydraulic casing containing a combustion space; a fire-tube convective heat exchanger of the heating circuit; a liquid heat carrier of the heating circuit; a heat exchanger of the hot water supply (HWS) circuit, located in the circulation volume of the liquid heat carrier of the heating circuit; branch pipes of the heating and hot water supply systems. The casing contains a door with a fitting for connecting a gas burner, and the heat exchanger of the HWS circuit is a removable module made with the possibility of a sealed connection to the boiler casing by means of a detachable flange joint and including: a package of U-shaped pipes, a manifold, branch pipes for supplying and draining water of the HWS circuit.

It is preferable that the heat exchanger of the heating circuit be made in the form of a package of smoke tubes, fixed at the ends on tube sheets, which serve as the rear and front walls of the heat exchanger.

It is preferable that the housing has the shape of a horizontally oriented cylinder, in the front end wall of which a door with a fitting for connecting a gas burner is made, and in the rear end wall of the housing a branch pipe for removing combustion products is installed.

It is preferable that threaded fittings be used as water inlet and outlet pipes in the hot water supply circuit heat exchanger.

A comparative analysis of the claimed utility model with the prototype showed that in all cases of implementation it differs from the known, closest technical solution:

- the design of the body contains a door with fittings for connecting a gas burner;

- implementation of the DHW circuit heat exchanger in the form of a removable module;

- implementation of a removable module of the DHW circuit heat exchanger with the possibility of hermetically sealed connection with the boiler body by means of a detachable flange connection;

- the production of a removable module of the DHW circuit heat exchanger, including: a package of U-shaped pipes, a manifold, and water inlet and outlet pipes for the hot water supply circuit.

In some cases of implementation, the claimed utility model differs from the known, closest technical solution:

- implementation of the heating circuit heat exchanger in the form of a package of smoke tubes, fixed with their ends on tube sheets, serving as the rear and front walls of the heat exchanger;

- the design of the housing has the shape of a horizontally oriented cylinder, in the front end wall of which a door with fittings for connecting a gas burner is made, and in the rear end wall of the housing a branch pipe for removing combustion products is installed;

- using threaded fittings as water inlet and outlet pipes in the DHW circuit heat exchanger.

The implementation of the DHW circuit heat exchanger as a removable module with the possibility of hermetically sealed connection to the boiler body by means of a detachable flange joint and containing a package of U-shaped pipes, a manifold, and water inlet and outlet pipes for the hot water supply circuit increases the maintainability of the boiler, providing the possibility of quickly dismantling a faulty hot water supply circuit heat exchanger and installing a serviceable (repaired or new) heat exchanger without a long shutdown of the boiler, including for major repairs.

The design of the boiler body contains a door with fittings for connecting a gas burner, and is a single unit of construction.

The design of the boiler body in the form of a horizontally oriented hollow cylinder, the presence of a door in the front end wall of the body containing a channel for inserting the burner nozzle into the firebox, the design of the combustion product discharge pipe installed in the rear end wall of the body, allows the implementation of the declared technical solution, characterized by increased maintainability.

The proposed utility model is illustrated by the drawings presented in Fig. 1.

Fig. 1 shows a schematic drawing of a heating and hot water supply boiler, in an axonometric projection with a longitudinal section.

In a preferred embodiment, the fire-tube boiler for heating and hot water supply includes a sealed hydraulic casing 1 containing a combustion chamber 2; a fire-tube convective heat exchanger 3 of the heating circuit; a liquid heat carrier 4 of the heating circuit; a heat exchanger 5 of the hot water supply (HWS) circuit, located in the circulation volume of the liquid heat carrier 4 of the heating circuit; supply pipes 6 and discharge pipes 7 of the liquid heat carrier of the heating circuit; supply pipes 8 and discharge pipes 9 of water of the HWS circuit, and a pipe 10 for discharging combustion products. The casing 1 contains a door 11 with a fitting 12 for connecting a gas burner (not shown in the drawing). The heat exchanger 5 of the DHW circuit is a removable module, designed with the possibility of a hermetically sealed connection with the body 1 of the boiler by means of a detachable flange connection 13. The removable module of the heat exchanger 5 of the DHW circuit includes a package of U-shaped pipes 14, a collector 15, and branch pipes for supplying 8 and draining 9 water of the DHW circuit. The fire-tube convective heat exchanger 3 of the heating circuit is designed in the form of a package of smoke tubes 16, fixed with their ends on tube sheets 17, 18, serving as the rear and front walls of the heat exchanger 3. The body 1 of the boiler has the shape of a horizontally oriented cylinder, in the front end wall of which a door 11 with a fitting 12 for connecting a gas burner is made, and a branch pipe 10 for removing combustion products is installed in the rear end wall of the body. Threaded fittings are used as water inlet 8 and outlet 9 pipes in the heat exchanger 5 of the DHW circuit.

The utility model works as follows.

The removable module of the DHW heat exchanger 5 is connected to the housing 1 by means of a detachable flange connection 13, placing a package of U-shaped pipes 14 inside the circulation volume of the liquid heat carrier 4 of the heating circuit. The so-called "boiler" water can be used as the liquid heat carrier 4. The flue gases, passing from the burner torch (not shown in the drawing) through the combustion space 2 and the fire-tube convective heat exchanger 3 of the heating circuit, are collected in the outlet gas chamber 19 and are discharged through the branch pipe 10, in the process of passing they heat the liquid heat carrier 4 of the heating circuit ("boiler" water). The heated "boiler water", washing the U-shaped pipes 14 of the DHW heat exchanger 5, heats the water of the hot water supply circuit passing through them. If necessary, the removable module of the DHW heat exchanger 5 is disconnected from the housing 1 and replaced with a new (or repaired) one.

The DHW heat exchanger module 5 is compact, quickly replaceable, and can be removed from the boiler body without the need to take the boiler out for major repairs (using work that disrupts the hydraulic circuit, involving cutting out body 1 and pipes 14).

List of structural elements:

1. sealed hydraulic boiler body,

2. boiler combustion chamber,

3. fire-tube convective heat exchanger of the heating circuit,

4. liquid coolant of the heating circuit,

5. heat exchanger of the hot water supply (DHW) circuit,

6. branch pipe for supplying liquid coolant to the heating circuit,

7. branch pipe for draining liquid coolant of the heating circuit,

8. water supply pipe for the DHW circuit,

9. water outlet pipes of the DHW circuit,

10. combustion product discharge pipe,

11. door,

12. fittings for connecting a gas burner,

13. Detachable flange connection,

14. U-shaped pipes,

15. collector,

16. smoke tubes,

17. front tube sheet,

18. rear tube plate,

19. outlet gas chamber.

Claims (4)

1. A fire-tube boiler for heating and hot water supply, comprising a sealed hydraulic body containing a combustion space, a fire-tube convective heat exchanger of the heating circuit, a liquid coolant of the heating circuit, a heat exchanger of the hot water supply (HWS) circuit, located in the circulation volume of the liquid coolant of the heating circuit, branch pipes of the heating and hot water supply systems, characterized in that the body contains a door with a fitting for connecting a gas burner, and the heat exchanger of the HWS circuit is a removable module, designed with the possibility of a hermetically sealed connection to the boiler body by means of a detachable flange joint and including a package of U-shaped pipes, a manifold, branch pipes for supplying and draining water of the HWS circuit. 2. A boiler according to item 1, characterized in that the heat exchanger of the heating circuit is made in the form of a package of smoke tubes, fixed with their ends on tube sheets, which serve as the rear and front walls of the heat exchanger. 3. A boiler according to item 1, characterized in that the body has the shape of a horizontally oriented cylinder, in the front end wall of which a door with a fitting for connecting a gas burner is made, and in the rear end wall of the body a branch pipe for removing combustion products is installed. 4. A boiler according to item 1, characterized in that threaded fittings are used as water inlet and outlet pipes in the DHW circuit heat exchanger.