RU2031315C1 - Prolonged combustion furnace with recuperation of heat from smoke - Google Patents

Abstract

FIELD: prolonged combustion furnaces. SUBSTANCE: case of the furnace is made of pig iron sections connected together hermetically sealed. The sections have cavities which form multiturn chimney system. Vertical channels are used for supplying heated air to entrance holes of chimneys. Lime is provided under the furnace provided with removable fire grate and scoop-metering device. EFFECT: improved efficiency. 3 cl, 5 dwg

Description

 The invention relates to domestic stoves or stoves for solid fuels intended for space heating and cooking.

 Known furnace with a device for heat recovery and a heat recovery system of flue gases in stoves with wood fuel. The stove is designed for burning wood and heating rooms; it is impossible to cook food on it. The furnace is structurally made of thin-sheet stainless heat-resistant steel, the elements and parts of the furnace are interconnected by electric welding. The design of the furnace is quite complex, the manufacturing technology requires highly qualified welders in welding thin-sheet heat-resistant steels and methods for monitoring the tightness of welds. The labyrinth system of chimneys for flue gas intake is located in the rear of the furnace and clutters it. During the combustion process, the furnace is subject to warping and deformation. After the combustion process ends, the steel thin-walled furnace cools down quickly.

 The purpose of the invention is to simplify the design and manufacturing technology of the stove, the ability to burn various types of fuel: firewood, anthracite, coal and lignite, briquetted low-ash fuel, etc., the possibility of cooking.

 The goal is achieved in that the heating furnace is assembled from individual cast-iron U-shaped sections of the front and rear sections and H-shaped middle cast sections connected to each other by threaded ties and forming a multi-turn system of chimneys (channels) in the side walls. The connecting planes between the sections during assembly are sealed with heat-resistant sealant.

 In the design of the furnace, in addition to the blinds in the door, an ash pan is provided with a replaceable grate and a scoop - dispenser for entering primary air into the furnace. The combination of features of the furnace design provides a simpler device compared to the known design, increases durability and ease of use, extends the range of fuel used.

 1 shows a front view of a furnace; FIG. 2 is a view along arrow A in FIG. 1 with a cut through the chimney system; figure 3 is the same, a top view; figure 4 - oven, axonometry; figure 5 is a section bB in figure 1.

 The heating furnace comprises a housing 1 assembled from cast iron cast front 2 and rear 3 U-shaped sections and middle 4,5,6,7 N-shaped sections in cross-section, interconnected by threaded ties. Seams are sealed with heat-resistant sealant. The cavities of 8 sections form a multi-turn system 9 of the chimneys in the side walls 10 and 11, the bottom 12 and the ceiling 13 of the housing 1. The inlets of the chimney system are the openings 14 and 15 of the cavities formed by the sections 3 and 4 in the upper part of the housing. The cavity 16 of the double ceiling connects the chimney system to the pipe in the direction of arrow 17 or 18, depending on the design of the furnace. Vertical channels 19 and 20, cast in sections, are suitable for the lower part of the holes 14 and 15. The inlet holes of the channels 19 and 20 are brought into the gap between the bottom 12 of the housing and the bottom of the fence 21, covering the housing of the furnace from below, above, behind and on the sides.

 The inner part of the housing 1 is a firebox 22 and is closed by a door 23, in the lower part of which there are adjustable shutters 24 for primary air intake. The lower part of the sections under the furnace forms an ash pan 25 with a scoop-dispenser 26 for primary air. The ash pan is blocked by a replaceable grate 27.

 The furnace operates as follows.

 The products of fuel combustion due to draft in the chimney at the exit from the furnace 22 are divided into two streams and through openings 14 and 15 in the side walls 10 and 11 enter the multi-turn system 9 of the chimneys. The multi-turn chimney system ends with exits on arrows 17 or 18.

The holes 14 and 15 through the vertical channels 19 and 20 due to convection and draft in the chimney receive heated secondary air from the gap between the bottom 12 of the housing 1 and the bottom of the fence 21. Meeting with unburned combustible substances in the smoke, the air causes them to flash, raising the temperature flame up to +950 ^о С and higher.

 Thanks to the secondary combustion, heat is recovered (returned) from the smoke.

 The ignited mixture circulates through a multi-turn system 9 of chimneys from the rear section 3 to the front 2 and then through the cavity 16 of the double ceiling 13 into the chimney, simultaneously transferring heat to the cast-iron body 1.

 Cold room air enters along the arrow 28 at the bottom in the gap between the bottom 12 of the housing 1 and the guard 21, in contact with the heated cast iron housing 1, heats up, becomes lighter and rises, passes forward and enters the room. The adjacent lower layers of air take its place, and thus around the body 1 due to convection a constant air movement is created.

 In addition to the convection heating method, it is possible to supply air forcibly with a fan under the cast-iron body of the furnace. The fuel combustion process is regulated by the blinds 24 and the scoop-dispenser 26, depending on the amount of primary air supplied. With a small amount of primary air there is a long burning of fuel. The emitted combustible elements burn out almost completely when they encounter heated secondary air coming from the bottom from the gap between the guard 21 and the bottom 12 of the housing 1 through the vertical channels 19 and 20 to the holes 14 and 15 in the side walls 10 and 11. Thus, an economical fuel consumption is achieved , its complete combustion and the highest possible heat transfer to the walls of the furnace body and to the surrounding air.

 In order to burn other types of fuel (coal and lignite, anthracite, etc.), in addition to firewood, in the furnace, an ash pan 25 with a dustpan 26 is used in the furnace design to supply primary air and remove ash.

 To create comfort in the house and monitor the process of burning fuel in the door 23 installed inspection heat-resistant glass 29.

 To reduce the emission of smoke into the room when opening the door 23 and when igniting the fuel in the front of the furnace 22 there is a direct draft hole, blocked by the valve 30 in the operating mode of the furnace. The valve 30 is controlled by a lever-lever 31 through a system of levers 32 and 33.

Claims (3)

 1. LONG-BURNING FURNACE WITH SMOKE HEAT RECOVERY, comprising a housing with a furnace, a labyrinth chimney system inside the housing, a door with adjustable louvers for supplying primary air to the furnace, a steel casing mounted around the housing with a gap, and channels for supplying heated secondary air from a gap to the inlet of the chimneys, characterized in that the furnace body is made of hermetically interconnected cast-iron sections with cavities forming a multi-turn chimney system, the channels for heated air ying vertical and under the insert is provided with a removable ash pan grate.  2. The furnace according to claim 1, characterized in that the front and rear sections of the housing have a U-shaped cross section, and the middle ones have an H-shaped cross section.  3. The furnace according to claim 1, characterized in that the entrance to the ash pan is closed by a scoop-dispenser for supplying primary air.

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