CN110762557A - Coal stove - Google Patents

Abstract

The invention discloses a coal-fired stove, which comprises a base and a stove body arranged above the base, wherein a fire grate is arranged between the base and the stove body, a vertical partition plate for separating an inner space is arranged inside the stove body to form a front pyrolysis chamber and a rear cooking flue, the upper end of the partition plate is connected with the stove body, a gap for communicating the pyrolysis chamber and the cooking flue and allowing semicoke to pass through is arranged between the lower end of the partition plate and the fire grate, a coal feeding port is arranged above the pyrolysis chamber and provided with a coal feeding door, and a cooking port is arranged above the cooking flue; the furnace body front portion is provided with the anti-wind channel that burns, and the lower extreme in anti-wind channel that burns communicates the base, and the upper end in anti-wind channel that burns communicates the upper portion of pyrolysis chamber, and the air outlet in anti-wind channel that burns is located coal feeding mouth below and inside towards the pyrolysis chamber. The advantages of smoke abatement in back burning and strong firepower in front burning cooking are achieved, and the defects of weak back burning cooking and more black smoke in front burning are eliminated; the air distribution of the pyrolysis chamber solves the problem that the coal door is opened to return smoke, and reduces the accumulated smoke.

Description

a coal-fired stove

technical field

The invention relates to the field of cooking stoves, in particular to a coal-fired stove.

Background technique

In my country's rural and suburban areas, there are still a large number of households that use relatively scattered coal-fired heating methods, which are not only inefficient and polluting, but also have an impact on the environment several times the proportion of their fuel consumption. At present, my country consumes a large amount of coal every year, of which the civil part is basically all incinerated in a decentralized manner, and no environmental protection measures such as dust removal and desulfurization are taken.

The combustion process of household coal-fired stoves is cyclical. In the early stage of combustion, air is easily insufficient, and the gas produced by coal pyrolysis and gasification cannot be fully burned, and a large number of toxic and combustible components are discharged with the flue gas, causing environmental pollution and energy loss; the coal seam in the later stage of combustion Thinning, excess air will reduce furnace temperature and heat transfer efficiency and increase exhaust heat loss. Some furnace types only improve the combustion efficiency of coal by means of high temperature oxygen enrichment, but will increase the emission of nitrogen oxides (NOx). In addition, increasing the combustion temperature will also increase the reverse reaction of desulfurization and reduce the desulfurization efficiency in the furnace.

Existing stoves are divided into two types, which are positive-firing and reverse-firing, among which positive-firing is the most common direct-firing method. When the solid fuel burns, the flame spreads along the natural flow direction of the hot flue gas. The advantage is that the combustion intensity is high and the firepower is strong, which can meet the cooking needs of users. of fuel. When the anti-burning solid fuel is burned, the flame spreads against the natural flow direction of the hot flue gas. The advantage is that it can delay the speed of volatilization analysis. The furnace temperature is high and the combustion is sufficient, which can basically eliminate black smoke. Low, weak firepower, not suitable for cooking, suitable for high volatile fuel such as bituminous coal.

At present, most household coal-fired stoves use the common burning principle. Air enters from the bottom of the stove and passes through the entire furnace. The combustion process is periodic. At the initial stage of combustion, air is easily insufficient, and the gas produced by coal pyrolysis and gasification cannot be fully burned. A large number of toxic and combustible components are discharged with the flue gas, causing environmental pollution and energy loss; the coal seam is thinned in the later stage of combustion, and the excess air will reduce the furnace temperature and heat transfer efficiency, and increase the heat loss of exhaust gas.

Therefore, how to provide a coal-fired stove that can overcome the above-mentioned defects is a technical problem that those skilled in the art need to solve at present.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a coal-fired stove, which is provided with a pyrolysis chamber and a cooking fire channel inside the furnace body, which carry out normal combustion and reverse combustion respectively, have the advantages of both combustion methods, and overcome the existing problems in the prior art. defect.

In order to solve the above technical problems, the present invention provides a coal-fired stove, comprising a base and a furnace body installed above the base, a grate is arranged between the base and the furnace body, and a rear part of the furnace body is provided. A smoke box is connected, and a vertical partition for separating the inner space is arranged inside the furnace body to form a pyrolysis chamber at the front and a cooking fire channel at the rear, and the upper end of the partition is connected to the furnace body, Between the lower end of the partition plate and the grate, there is a gap that communicates with the pyrolysis chamber and the cooking fire and is used for the passage of semi-char. A coal feeding port is arranged above the pyrolysis chamber, and is provided with There is a coal feeding door, and a cooking port is arranged above the cooking fire channel;

The front part of the furnace body is provided with a reverse combustion air duct, the lower end of the reverse combustion air duct is connected to the base, the upper end of the reverse combustion air duct is connected to the upper part of the pyrolysis chamber, and the reverse combustion air duct is connected to the upper part of the pyrolysis chamber. The air outlet is located below the coal feeding port and faces the interior of the pyrolysis chamber.

Preferably, the upper part of the pyrolysis chamber is provided with an anti-combustion air chamber, the upper end of the anti-combustion air chamber is movably installed with the coal charging door, and the lower end of the anti-combustion air chamber is movably installed with an air distribution plate. The air plate is provided with a through hole communicating with the anti-burning air chamber and the pyrolysis chamber.

Preferably, the cross-sectional area of the through hole is smaller than the cross-sectional area of the coal feeding port.

Preferably, the cooking port is disposed directly above the cooking fire channel, the coal feeding port is disposed obliquely above the pyrolysis chamber, close to the front end of the pyrolysis chamber, and the anti-burning air chamber is disposed obliquely.

Preferably, the furnace body and the outer shell of the smoke box include an inner tank and an outer tank that are spaced apart from each other, a water jacket interlayer is formed between the inner tank and the outer tank, and the upper part of the smoke box is provided with a communication The water outlet of the water jacket interlayer, and the lower part of the furnace body is provided with a water return port that communicates with the water jacket interlayer.

Preferably, the anti-burning air duct isolates the inner tank and the front part of the pyrolysis chamber.

Preferably, the upper part of the cooking fire channel is provided with a secondary air chamber, the secondary air chamber is located below the cooking port, and there is a gap between them, and a secondary air channel is arranged in the cooking fire channel , the lower end of the secondary air passage is connected to the base, and the upper end of the secondary air passage is connected to the secondary air chamber.

Preferably, an air distribution ring with a vertical axis is installed in the secondary air chamber, and a vent is provided on the side of the air distribution ring.

Preferably, a refractory clay coating is provided on the inner wall of the furnace and the partition plate, and a gap is provided between the refractory clay coating near the rear of the cooking fire and the inner wall of the furnace to form a vertical Straight said secondary air channel and horizontal secondary air chamber.

Preferably, the refractory mud coating near the rear of the cooking fire is provided with a concave structure, and is provided with evenly distributed ventilation holes in layers along the vertical direction, and the ventilation holes communicate with the cooking fire and the secondary air channel.

The invention provides a coal-fired stove, comprising a base and a furnace body installed above the base, a grate is arranged between the base and the furnace body, a smoke box is connected to the rear of the furnace body, and a furnace body is provided inside the furnace body to separate the internal space The upper end of the partition is connected to the furnace body, and the lower end of the partition and the grate are provided with a connection between the pyrolysis chamber and the cooking fire. In the gap where the semi-coke passes, a coal feeding port is set above the pyrolysis chamber, and a coal feeding door is set, and a cooking port is set above the cooking fire channel; The lower end is connected to the base, the upper end of the anti-burning air duct is connected to the upper part of the pyrolysis chamber, and the air outlet of the reverse-burning air duct is located below the coal feeding port and faces the interior of the pyrolysis chamber.

By setting a pyrolysis chamber and a cooking fire channel inside the furnace body, the pyrolysis chamber is the reverse burning area, and the cooking fire channel is the normal burning area. After the fuel is added, it is accumulated in the pyrolysis chamber, and the primary air is supplied through the grate. , The lower part of the pyrolysis chamber and the cooking fire is the main combustion area. Coal combustion is combined with the adjustment of the air supply to generate heat, and a small part of the heat is used for the upper fuel to be pyrolyzed in an oxygen-depleted state to generate pyrolysis gas and semi-coke. Smoke moves forward. In the main combustion area, the pyrolysis gas and semi-coke are co-burned; due to the negative pressure formed by the chimney's pulling force, the pyrolysis products of coal must be fully burned through the high-temperature semi-coke combustion layer, which can effectively eliminate the black smoke produced by the burning of bituminous coal. and reduce nitrogen oxide production. The burning flame enters the chimney through the cooking port and the smoke box, and heats the cooker along the way to complete the heating. The cooking fire channel mainly stores the semi-char after pyrolysis in the pyrolysis chamber, and enters the cooking fire channel by shaking the grate and operating the fire hook. The semi-char is burned by the normal burning method, and there is no problem of concentrated precipitation of volatile matter, and it can also improve the cooking firepower. In addition to the grate, a new primary air channel has been added. The airflow enters from the opening of the base ash hopper, reaches the coal filling door through the anti-burning air duct, enters the pyrolysis chamber after passing through the air distribution plate, mixes with the accumulated flue gas, and goes down through the coal bunker to participate in the combustion.

It has the advantages of anti-burning and eliminating smoke, and strong firepower for cooking, and eliminates the defects of weak anti-burning and more black smoke. It is more in line with the user's usage habits. The user uses a dual-purpose stove for heating and cooking. The heating period is long, and the firepower is required to be moderate and stable; the cooking period is short, and the firepower is required. Sending the semi-char to the burning area before cooking can quickly increase the firepower; while the hot-burning area is small, the firepower will drop rapidly after the semi-char is burnt out, and no fuel will be wasted. By setting the anti-burning air duct, air is distributed to the pyrolysis chamber, which solves the problem of smoke returning when the coal door is opened, and when the furnace is in normal use, air is continuously supplied to the pyrolysis chamber through the anti-burning air duct, which can remove the accumulated flue gas. The coal seam is introduced downward, which reduces the accumulated flue gas.

Description of drawings

FIG. 1 is a schematic structural diagram of a specific embodiment of the coal-fired stove provided by the present invention.

Detailed ways

The core of the present invention is to provide a coal-fired stove, which is provided with a pyrolysis chamber and a cooking fire channel inside the furnace body, which carry out normal combustion and reverse combustion respectively. defect.

In order to make those skilled in the art better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to FIG. 1 , which is a schematic structural diagram of a specific embodiment of a coal-fired stove provided by the present invention.

The specific embodiment of the present invention provides a coal-fired stove, comprising a base 1 and a furnace body 2, the furnace body 2 is installed above the base 1, a grate 3 is arranged between the base 1 and the furnace body 2, and the rear part of the furnace body 2 The smoke box 4 is connected, that is, the end connected with the smoke box 4 is the rear, and the opposite end is the front. Inside the furnace body 2, a vertical partition plate 5 for separating the internal space is arranged to form a pyrolysis chamber 6 at the front and a cooking fire channel 7 at the rear. The upper end of the partition plate 5 is connected to the furnace body 2, and the A gap is set between the lower end and the grate 3. This gap is used to communicate the pyrolysis chamber 6 and the cooking fire 7, and at the same time, it is used for the passage of semi-coke. A coal feeding port is set above the pyrolysis chamber 6 for adding fuel. , and a coal feeding door 8 is provided, and a cooking port 9 is provided above the cooking fire channel 7 for placing and adding cooking utensils.

The front part of the furnace body 2 is provided with an anti-combustion air duct 24, the lower end of the anti-combustion air duct 24 is connected to the base 1, the upper end of the anti-combustion air duct 24 is connected to the upper part of the pyrolysis chamber 6, and the air outlet of the anti-combustion air duct 24 is located in the furnace. Below the coal port and towards the interior of the pyrolysis chamber 6 .

By arranging a pyrolysis chamber 6 and a cooking fire channel 7 inside the furnace body 2, the pyrolysis chamber 6 is a back-burning area, and the cooking fire channel 7 is a normal-burning area. Primary air, above the grate 3, the pyrolysis chamber 6 and the lower part of the cooking fire channel 7 are the main combustion areas. Coal combustion is combined with the adjustment of the air supply to generate heat, and a small part of the heat is used for the upper fuel to be pyrolyzed in an oxygen-depleted state to generate heat. Degassing and semi-coke, most of the heat goes forward with the flue gas. In the main combustion area, the pyrolysis gas and semi-coke are co-burned; due to the negative pressure formed by the chimney's pulling force, the pyrolysis products of coal must be fully burned through the high-temperature semi-coke combustion layer, which can effectively eliminate the black smoke produced by the burning of bituminous coal. and reduce nitrogen oxide production. The combustion flame enters the chimney through the cooking port 9 and the smoke box 4, and heats the cooker along the way to complete the heating.

In addition to the grate 3, a new primary air channel is added. The airflow enters from the opening of the ash hopper of the base 1, reaches the coal charging door 8 through the anti-burning air duct 24, passes through the air distribution plate 26 and enters the pyrolysis chamber 6, mixes with the accumulated flue gas, and goes down through the coal bunker to participate in the combustion. In the prior art, when bituminous coal is used in the stove, the coal is burned in the pyrolysis chamber 6 and heated, and the volatilization is first analyzed under the oxygen-poor condition, and then goes down through the semi-coke layer and then enters the cooking fire 7, and there is accumulation on the top of the pyrolysis chamber 6. smoke. When users use it, they need to close the ash hopper 16 first, open the coal feeding door 8 and then switch to the coal feeding door 8 for air intake, which can guide the flue gas downward into the coal seam, but improper operation or insufficient low-load drawing force will cause flue gas. escape. However, the structure of the present invention overcomes the above-mentioned problems. By setting the anti-burning air duct, air is distributed to the pyrolysis chamber, which solves the problem of smoke returning when the coal door is opened, and when the furnace is in normal use, air is continuously supplied to the pyrolysis chamber through the anti-burning air duct, which can remove the accumulated flue gas. The coal seam is introduced downward, which reduces the accumulated flue gas.

An anti-burning air chamber 25 can also be arranged on the upper part of the pyrolysis chamber 6, the upper end of the anti-burning air chamber 25 is movably installed with a coal charging door 8, and the lower end of the anti-burning air chamber 25 is movably installed with an air distribution plate 26, and the air distribution plate 26 is provided with A through hole communicating with the anti-burning air chamber 25 and the pyrolysis chamber 6 . The cross-sectional area of the through hole is smaller than the cross-sectional area of the coal feeding port. Adjusting the size of each component according to the situation, that is, the connection method, is within the protection scope of the present invention. For example, the air distribution plate 26 and the coal charging door 8 are hinged to the stove through pins, and can be freely opened and closed during use.

By arranging the air distribution plate 26 , it is possible to open the coal charging door 8 under the condition of low load and small air supply without returning smoke. If all the flue gas of the pyrolysis chamber 6 is immediately introduced into the coal seam, the required air distribution will be large, the load of the furnace will be uncontrolled, and it is difficult to achieve low-load operation; it will also destroy the oxygen-lean combustion environment of the pyrolysis chamber 6, which is not conducive to pollutants. control. The opening area of the air distribution plate 26 is much smaller than the area of the coal feeding port. Under a small air distribution flow, the air hole can still maintain a certain flow rate to supply air to the interior. Although the flue gas is accumulated in the pyrolysis chamber 6, the air distribution plate 26 The space between it and the coal feeding door 8 no longer accumulates flue gas, so the smoke will not return when the user operates improperly or when the door is under low load. At the same time, after setting the air passage, the flue gas of the pyrolysis chamber 6 can be introduced into the combustion part for full combustion at all times, which reduces the accumulation of flue gas in the pyrolysis chamber 6, thereby reducing the generation of tar in the pyrolysis chamber.

It has the advantages of anti-burning and eliminating smoke, and strong firepower for cooking, and eliminates the defects of weak anti-burning and more black smoke. The volume of the pyrolysis chamber 6 is larger than that of the cooking fire channel 7, which is more in line with the user's usage habits. The user uses a dual-purpose stove for heating and cooking, and the heating period is long, requiring moderate and stable firepower; the cooking period is short, requiring strong firepower. Sending the semi-char to the burning area before cooking can quickly increase the firepower; while the hot-burning area is small, the firepower will drop rapidly after the semi-char is burnt out, and no fuel will be wasted.

Further, the upper part of the cooking fire passage 7 is provided with a secondary air chamber 20, the secondary air chamber 20 is located below the cooking port 9, and there is a gap between the two, and a secondary air passage 19 is provided in the cooking fire passage 7, The lower end of the secondary air passage 19 is connected to the base 1 , and the upper end of the secondary air passage 19 is connected to the secondary air chamber 20 .

The cooking fire channel 7 mainly stores the semi-char after pyrolysis in the pyrolysis chamber 6 , and enters the cooking fire channel 7 by shaking the grate 3 and operating the fire hook. The semi-char is burned by the normal burning method, and there is no problem of concentrated precipitation of volatile matter, and it can also improve the cooking firepower. In addition, the airflow enters the cooking fire channel 7 through the secondary air channel 19, and supplementary combustion is performed on the incompletely combusted combustible gas and particulate matter.

The high-temperature area for secondary supplementary combustion is designed to fully burn combustible gas and particulate matter, and to provide a high-temperature environment required for supplementary combustion. The secondary air inlet is integrated into the base, which simplifies user operations and prevents users from forgetting to turn off the secondary after closing the furnace. The air inlet leads to the escape of flue gas and CO poisoning accidents, which improves the safety.

A pullable ash hopper 16 can also be installed in the base 1 , and the air supply volume of the primary air and the secondary air can be adjusted by the size of the opening and closing of the ash hopper 16 . The ash hopper on the base 1 is a common inlet for primary air and secondary air. Under the action of the chimney, part of the airflow passes through the grate 3 to supply coal for combustion, and the other part of the airflow enters the cooking fire channel 7 through the secondary air channel 19 . The cooking port 9 is arranged directly above the cooking fire 7, which is convenient for placing cooking utensils. The coal feeding port is arranged obliquely above the pyrolysis chamber 6, close to the front end of the pyrolysis chamber 6, so as to facilitate the operation of coal feeding, and the anti-burning air chamber 25 is inclined. Or adjust the installation, connection and arrangement of each component according to the situation, all within the protection scope of the present invention.

In the coal-fired stove provided by the specific embodiment of the present invention, in order to improve the heating effect, a water heating system can be added. A water jacket interlayer is formed between the outer bladders 11 , the upper part of the smoke box 4 is provided with a water outlet 12 which communicates with the water jacket interlayer, and the lower part of the furnace body 2 is provided with a water return port 13 which communicates with the water jacket interlayer. During the use of the stove, the combustion flame enters the chimney through the cooking port 9 and the smoke box 4, heats the cooker along the way, heats the water in the water jacket interlayer, and transfers the heat to the circulating water through the water outlet 12 and the water return port 13 to complete the heating. The anti-burning air duct 24 isolates the inner tank 10 and the front part of the pyrolysis chamber 6, reduces the temperature of the front panel of the stove, and prevents burns.

Further, the smoke box 4 includes a vertical connection part and a horizontal transition part, one end of the transition part is connected to the upper part of the cooking fire 7, the other end of the transition part is connected to the lower end of the connection part, and the upper end of the connection part is connected to the chimney, which is convenient for smoke. Air is discharged normally. In order to quickly clean the dust in the smoke box, the bottom of the transition part is provided with a bottom dust cleaning door 14, and the two sides of the connecting part are provided with side dust cleaning doors 15, which are fixed by hand-tightening bolts. Or adjust the structure of the smoke box 4, and directly connect the furnace body 2 without setting the horizontal part.

In order to improve the heat exchange effect, the smoke box 4 is provided with a heat exchange pipe 17 which communicates with the water jacket interlayer. The number of hot water exchange pipes 17 can be increased. The plurality of hot water exchange pipes 17 in the connecting portion extend from front to back and are inclined upward, and the plurality of hot water exchange pipes 17 in the transition portion extend laterally, that is, the extension of the hot water exchange pipes 17 in the two parts. The directions are perpendicular to each other, which effectively improves the contact with the high temperature flue gas. Further, the partition plate 5 is provided with a water tank connected to the water jacket interlayer, so as to increase the heating of the heating water in the furnace. An explosion-proof valve 18 that communicates with the water jacket interlayer can also be provided at the connection part to improve the safety of the furnace.

In the coal-fired stove provided by the specific embodiment of the present invention, in order to make the secondary air more stable, an air distribution ring 21 with a vertical axis is installed in the secondary air chamber 20, and the side of the air distribution ring 21 is provided with ventilation openings . Specifically, a plurality of air vents are evenly distributed on the side surface of the air distribution ring 21 in layers. Wherein, the cross-sectional area of the air distribution ring 21 is where the cross-sectional area of the cooking fire 7 is the smallest. The cross section of the air distribution ring 21 is circular or square. The size, shape and arrangement of the ventilation openings of the air distribution ring 21 can also be adjusted according to the situation, which are all within the protection scope of the present invention.

In the coal-fired stoves provided by the above specific embodiments, the inner wall of the furnace body 2 and the partition plate 5 are provided with a refractory mud coating 22 . A gap is provided between the refractory mud coating 22 near the rear of the cooking fire channel 7 and the inner wall of the furnace body 2 to form a vertical secondary air passage 19 and a horizontal secondary air chamber 20 . A refractory clay coating 22 is designed around the cooking fire channel 7 to prevent the circulating water from taking away heat and create temperature conditions for secondary supplementary combustion. The secondary air is preheated by the refractory clay coating 22 and then enters the cooking fire 7 to prevent the cold air from directly entering the supplementary combustion area, improve the supplementary combustion stability, and ensure the supplementary combustion effect. In addition, there is no need to design a special secondary air pipeline, but a channel reserved for the refractory mud coating 22 and the inner tank 10 is used, and the processing and manufacturing are simple and the cost is low.

Further, the refractory mud coating 22 near the rear of the cooking fire channel 7 is provided with a concave structure, facing the passage of the pyrolysis chamber 6 and the cooking fire channel 7 formed by the partition plate 5, and is layered along the vertical direction. Evenly distributed ventilation holes 23 are connected to the cooking fire channel 7 and the secondary air channel 19 . In view of the high volatile content of bituminous coal, a longer supplementary combustion stroke is designed, and the ventilation holes 23 are arranged in layers and evenly along the stroke. It takes a certain period of time for the combustible gas and particles to flow through the cooking fire channel 7, and within this period of time, they can fully react with the evenly added oxygen, which improves the effect of supplementary combustion.

The included angle between the ventilation hole 23 and the flow direction of the flue gas is a right angle or an obtuse angle, specifically 90 degrees to 135 degrees. The air distribution ring 21 constitutes the mouth, and the concave surface design of the refractory clay coating 22 makes the flue gas form a turbulent flow in the cooking fire channel 7, and the flue gas and the secondary air are fully mixed, which improves the combustion efficiency of the flue gas and soot. Thereby, the emission of pollutants such as soot and CO is reduced, and the combustion efficiency of the stove is improved. The secondary air is located above the highest position of coal burning, which reduces the distance between the burning position and the cooking utensils, and improves the cooking fire intensity.

Or adjust the structure of each component according to the situation, such as the orientation angle, number and arrangement of the ventilation holes 23, the surface shape of the refractory clay coating 22, etc., all within the protection scope of the present invention.

The coal-fired stove provided by the present invention has been described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. A coal-fired stove, which comprises a base (1) and a stove body (2) arranged above the base (1), a fire grate (3) is arranged between the base (1) and the furnace body (2), the rear part of the furnace body (2) is connected with a smoke box (4), it is characterized in that a vertical clapboard (5) for separating the inner space is arranged in the furnace body (2) to form a front pyrolysis chamber (6) and a rear cooking flue (7), the upper end of the clapboard (5) is connected with the furnace body (2), a gap for communicating the pyrolysis chamber (6) with the cooking flame path (7) and allowing semi-coke to pass through is arranged between the lower end of the clapboard (5) and the fire grate (3), a coal feeding port is arranged above the pyrolysis chamber (6), a coal feeding door (8) is arranged, and a cooking opening (9) is arranged above the cooking flue (7);

the utility model discloses a pyrolysis furnace, including furnace body (2), furnace body (2) front portion is provided with anti-wind channel of burning (24), the lower extreme intercommunication in anti-wind channel of burning (24) base (1), the upper end intercommunication in anti-wind channel of burning (24) the upper portion of pyrolysis chamber (6), just the air outlet in anti-wind channel of burning (24) is located coal feeding mouth below and orientation pyrolysis chamber (6) are inside.

2. The coal-fired stove according to claim 1, characterized in that the upper part of the pyrolysis chamber (6) is provided with a reverse combustion chamber (25), the upper end of the reverse combustion chamber (25) is movably provided with the coal door (8), the lower end of the reverse combustion chamber (25) is movably provided with an air distribution plate (26), and the air distribution plate (26) is provided with a through hole for communicating the reverse combustion chamber (25) and the pyrolysis chamber (6).

3. The coal-fired furnace as set forth in claim 2, wherein the cross-sectional area of the through-hole is smaller than the cross-sectional area of the coal charging port.

4. The coal-fired stove according to claim 3, characterized in that the cooking opening (9) is arranged directly above the cooking flue (7), the coal feeding opening is arranged obliquely above the pyrolysis chamber (6) near the front end of the pyrolysis chamber (6), and the reverse combustion chamber (25) is arranged obliquely.

5. The coal-fired furnace of claim 1, wherein the outer shell of the furnace body (2) and the smoke box (4) comprises an inner container (10) and an outer container (11) which are spaced from each other, a water jacket interlayer is formed between the inner container (10) and the outer container (11), a water outlet (12) communicated with the water jacket interlayer is arranged at the upper part of the smoke box (4), and a water return port (13) communicated with the water jacket interlayer is arranged at the lower part of the furnace body (2).

6. The coal-fired furnace according to claim 5, characterized in that the back-fire air duct (24) separates the inner container (10) from the front of the pyrolysis chamber (6).

7. The coal-fired stove according to any one of claims 1 to 6, characterized in that the cooking flue (7) is provided at its upper portion with a secondary air chamber (20), the secondary air chamber (20) is located below the cooking opening (9) with a space therebetween, a secondary air passage (19) is provided in the cooking flue (7), the lower end of the secondary air passage (19) communicates with the base (1), and the upper end of the secondary air passage (19) communicates with the secondary air chamber (20).

8. The coal-fired furnace set forth in claim 7 wherein an air distribution ring (21) with a vertical axis is installed in the secondary air chamber (20), and a ventilation opening is provided on the side of the air distribution ring (21).

9. The coal-fired stove according to claim 8, characterized in that the inner wall of the stove body (2) and the partition plate (5) are provided with a refractory mortar coating (22), and a gap is provided between the refractory mortar coating (22) near the rear part of the cooking flue (7) and the inner wall of the stove body (2) to form the vertical secondary air channel (19) and the horizontal secondary air chamber (20).

10. The coal-fired stove according to claim 9, characterized in that the refractory mortar coating (22) near the rear of the cooking flame (7) is provided with an inner concave structure and with evenly distributed ventilation holes (23) layered in the vertical direction, the ventilation holes (23) communicating the cooking flame (7) and the secondary air channel (19).

Images