Air heating type civil stove provided with heat pipe cooling type fire grate

Abstract

The utility model discloses an air heating type civil stove provided with a heat pipe cooling type fire grate, which relates to the technical field of air heating type heating stoves, and comprises a stove body, a combustion chamber is arranged in the stove body, a heat exchange chamber is arranged above the combustion chamber, the heat exchange chamber is connected with a smoke exhaust pipe, a heat exchange pipe is arranged in the heat exchange chamber, and a warm air outlet is arranged on the front side of the heat exchange chamber; a fire grate is installed in the combustion chamber and comprises a primary air channel and a fire grate upper plate, an inlet of the primary air channel is communicated with a combustion fan, and the primary air channel is provided with a primary air outlet hole with an opening facing the upper surface of the fire grate upper plate. The boiler further comprises a heat pipe used for dissipating heat of the fire grate, the heat pipe comprises an evaporation section installed in the fire grate and a condensation section communicated with the evaporation section, and the condensation section is installed in the hot air ascending channel of the boiler body. The air conditioner further comprises an air circulation fan, and air blown out by the air circulation fan is blown out through the warm air outlet. According to the utility model, a heat pipe cooling mode is adopted to cool the fire grate of the air heating type civil stove, and the cooling effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of air-heating type heating stoves, in particular to an air-heating type civilian stove equipped with a heat pipe cooling grate. Background Art

[0002] Biomass fuels are rich in alkali metals and alkaline earth metals. The direct impact of this is that the ash melting point of biomass fuels is often relatively low, which is particularly prone to slagging during direct combustion, gasification and other heat utilization processes. Moreover, if alkali metals enter the flue gas, they will also condense on the heating surface and cause hard ash deposits that are difficult to clean, seriously affecting the heat transfer efficiency of the heat exchange tube bundle. Therefore, in the process of gasification or combustion of biomass fuels (or high-alkali coal fuels), how to suppress the slagging problem in the oxidation zone caused by the high alkali metal content has become a pain point and difficult problem in this field.

[0003] The Chinese invention patent application number 202410932298.3 proposes a water-cooled anti-slagging gasification combustion air outlet structure and its control method, such as Figure 2 As shown, the method utilizes a designed single-layer grate and a double-layer grate stacked in combination to reduce direct contact between the ash and the local high-temperature area, and the ash temporarily stored in the groove 21 is cooled by the surface of the water-cooled grate to prevent slagging and expansion; the grate 9 is cooled by a cooling method of spraying water into the water-cooling channel 20 in the grate 9; the gasified air is forced to leave the outlet of the grate 9 and blow in a direction parallel to the surface of the grate 9, and the downstream concave surface or groove 21 can promote more air to flow through the area below the fuel 22 close to the surface of the grate 9, thereby forcing this area to become the local highest temperature area 23, greatly reducing the local high temperature in the fuel 22, thereby effectively suppressing slagging; the accompanying drawings Figure 1 This is a diagram showing the air flow direction and temperature distribution of a traditional grate. Figure 2 This is a schematic diagram of the air flow direction and temperature after the new grate forces the air to turn.

[0004] The above patent provides a new idea for the air outlet method of the grate, which can better concentrate the combustion area of ​​the fuel in the area close to the grate surface, and prevent high-temperature slagging in the combustion area by cooling the grate; however, this solution mainly cools the grate by water cooling, and for air-heated heating furnaces, there is no external circulating water to cool the grate surface. If the grate is cooled by air cooling alone, the cooling effect needs to be improved. Utility Model Content

[0005] The utility model aims to provide an air-heating type civil stove equipped with a heat pipe cooling grate, which adopts a heat pipe cooling method to cool the grate of the air-heating type civil stove, thereby achieving a better cooling effect.

[0006] The utility model includes a furnace body, which is provided with a combustion chamber, a heat exchange chamber is provided above the combustion chamber, the heat exchange chamber is connected to the smoke exhaust pipe, a heat exchange pipe is provided in the heat exchange chamber, and a warm air outlet is provided on the front side of the heat exchange chamber; an ash chamber is provided below the combustion chamber, and the ash chamber is provided with an ash discharge door; it also includes a hopper, which is connected to a feeding device; a grate is installed in the combustion chamber, the grate is provided with a primary air channel and a grate upper plate, the inlet of the primary air channel is connected to the combustion-supporting fan, and the primary air channel is provided with a primary air outlet opening on the upper surface of the grate upper plate; it also includes a heat pipe for dissipating heat to the grate, the heat pipe includes an evaporation section installed in the grate, and a condensation section connected to the evaporation section, and the condensation section is installed in the hot air rising channel of the furnace body; it also includes an air circulation fan, the air blown out by the air circulation fan absorbs the heat of the condensation section in the hot air rising channel, enters the heat exchange pipe of the heat exchange chamber, is heated twice in the heat exchange pipe, and is blown out through the warm air outlet.

[0007] Preferably, a plurality of heat dissipation fins are arranged at intervals on the condensing section.

[0008] Preferably, an air guide plate is provided above the primary air outlet, and the air guide plate is arranged parallel to the grate upper plate.

[0009] Preferably, a secondary air duct is further installed on the side of the combustion chamber, and a secondary air outlet hole communicating with the combustion chamber is provided on the secondary air duct, and an inlet of the secondary air duct is connected to the combustion-supporting fan.

[0010] Preferably, there are a plurality of grates which are arranged in parallel at intervals in the combustion chamber, and an ash dropout opening is formed between two adjacent grates.

[0011] Preferably, the upper plate of the grate is tilted toward the ash outlet.

[0012] In summary, the present invention has the following beneficial effects:

[0013] 1. The air generated by the combustion-supporting fan enters the primary air channel of each grate, and then is sprayed into the combustion chamber through the primary air outlet in a direction parallel to the grate surface to support the combustion of the fuel. The air is blown parallel to the grate surface, which forces more air to flow through the area below the fuel close to the grate surface, forcing this area to become the local highest temperature area, facilitating cooling through the grate. This avoids blowing air upward from the bottom of the grate like traditional stoves, which causes the fuel in the upper part to burn, generate high temperature in the upper part, and cannot dissipate heat in time, resulting in high-temperature slagging.

[0014] 2. Using heat pipe cooling to cool the grate can quickly reduce the temperature of the grate surface. It is more suitable for stoves that do not use water. It can avoid the heat loss caused by the hot water generated by water cooling having nowhere to be used. Compared with the forced exhaust cooling method, the cold zone method of the heat pipe can expand the heat dissipation area through the condensation section of the heat pipe, thereby accelerating the heat dissipation speed of the evaporation section and having a better cooling effect on the grate.

[0015] 3. The air blown out by the air circulation fan first absorbs heat in the condensing section of the heat pipe and is preheated initially. Then it enters the heat exchange tube for a second heating and is blown out through the warm air outlet. The heat absorbed by the air from the condensing section of the heat pipe is used for the preliminary preheating of the air, so that the temperature of the air finally blown out from the warm air outlet is higher, which improves the heat utilization efficiency and kills two birds with one stone. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the air flow direction and temperature distribution of the traditional grate mentioned in the background technology;

[0017] Figure 2 This is a schematic diagram of the air flow direction and temperature after the new grate forced air to turn as cited in this patent in the background technology;

[0018] Figure 3 This is a schematic structural diagram of an air-heated civilian stove equipped with a heat pipe cooling grate according to the present invention;

[0019] Figure 4 for Figure 3 Left view of;

[0020] Figure 5 for Figure 3 Enlarged view of point A in the middle.

[0021] In the figure: 1. Furnace body; 2. Combustion chamber; 3. Heat exchange chamber; 4. Smoke exhaust pipe; 5. Heat exchange pipe; 6. Warm air outlet; 7. Grate; 701. Primary air duct; 702. Grate upper plate; 703. Primary air outlet; 704. Air guide plate; 705. Heat conductive filler; 8. Combustion-supporting fan; 9. Heat pipe; 901. Evaporation section; 902. Condensation section; 903. Heat dissipation fins; 10. Hot air rising channel; 11. Air circulation fan; 12. Secondary air duct; 13. Secondary air outlet; 14. Hopper; 15. Feeding device; 16. Ash chamber; 17. Ash discharge door; 18. Ash drop port; 19. Furnace cover; 20. Water cooling channel; 21. Groove; 22. Fuel; 23. High temperature area. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] The orientations mentioned in this specification are based on the orientations of the air-heated civilian stove equipped with a heat pipe cooling grate of the present invention during normal operation. The orientations during storage and transportation are not limited and only represent relative position relationships, not absolute position relationships.

[0024] like Figures 3 to 5 As shown together, a wind-heated civilian stove equipped with a heat pipe 9 cooling grate 7 includes a furnace body 1, a furnace cover 19 is provided above the furnace body 1, a combustion chamber 2 is provided in the furnace body 1, a heat exchange chamber 3 is provided above the combustion chamber 2, the heat exchange chamber 3 is connected to the smoke exhaust pipe 4, the smoke generated by the combustion of fuel in the combustion chamber 2 exchanges heat with the heat exchange pipe 5 in the heat exchange chamber 3, and is discharged through the smoke exhaust pipe 4; a heat exchange pipe 5 is provided in the heat exchange chamber 3, and a warm air outlet 6 is provided on the front side of the heat exchange chamber 3, after the air is heated in the heat exchange pipe 5, it is blown into the room from the warm air outlet 6; it also includes a hopper 14, the hopper 14 is used to store fuel, the hopper 14 is connected to the feeding device 15, the feeding device 15 is equipped with an auger, and the auger feeds the fuel placed in advance in the hopper 14 into the grate 7 in the combustion chamber 2 according to a certain feeding speed for combustion.

[0025] A grate 7 is installed in the combustion chamber 2. The grate 7 is provided with a primary air channel 701 and a grate upper plate 702. There are several grates 7, which are arranged in parallel at intervals in the combustion chamber 2, thereby dividing the combustion chamber 2 into two upper and lower spaces. The upper part of the grate 7 is used to burn fuel, and the lower part of the grate 7 is provided with an ash chamber 16. The ash chamber 16 is used to temporarily store the ash produced by combustion. The ash chamber 16 is provided with an ash discharge door 17. The ash discharge door 17 is used to remove the ash in the ash chamber 16; an ash outlet 18 is formed between two adjacent grates 7, and the ash produced by fuel combustion falls into the ash chamber 16 through the ash outlet 18 between adjacent grates 7. The ash discharge door 17 is opened regularly to manually remove the ash in the ash chamber 16; the grate upper plate 702 is inclined toward the ash outlet 18. The inclined grate upper plate 702 is more conducive to the ash moving to the ash outlet 18 under the action of gravity, and finally discharged through the ash outlet 18.

[0026] The primary air channel 701 is provided with a primary air outlet hole 703 opening toward the upper surface of the grate upper plate 702. There are a number of primary air outlet holes 703, which are arranged at intervals along the length direction of the primary air channel 701. The entrance of the primary air channel 701 is connected to the combustion-supporting fan 8. The natural wind generated by the combustion-supporting fan 8 passes through the primary air channel 701 and is blown out from the primary air outlet hole 703 to assist the combustion of the fuel in the combustion chamber 2. The smoke generated by the combustion passes through the heat exchange chamber 3 and is discharged through the smoke exhaust pipe 4.

[0027] like Figure 2As shown, the surface of the grate 7 is provided with grooves 21, and the grooves 21 are arranged along the air outlet direction of the primary air outlet hole 703; an air guide plate 704 is provided above the primary air outlet hole 703, and the air guide plate 704 is arranged parallel to the grate upper plate 702, so that the wind blown out from the primary air outlet hole 703 is parallel to the surface direction of the grate 7, and is blown out along the grooves 21 on the surface of the grate 7, so that more air is prompted to flow through the area close to the surface of the grate 7 below the fuel, thereby forcing this area to become the local highest temperature area 23, which is convenient for the grate 7 to be quickly cooled and the temperature is prevented from forming high-temperature slagging.

[0028] The heat pipe 9 further includes a heat pipe 9 for dissipating heat to the grate 7. The heat pipe 9 includes an evaporation section 901 installed in the grate 7 for dissipating heat to the grate 7, and a condensation section 902 connected to the evaporation section 901 for dissipating heat. The evaporation section 901 is filled with an appropriate amount of working medium. Preferably, in this embodiment, the working medium is water. In other embodiments, the working medium may also be a substance with other components. A capillary tube is connected between the evaporation section 901 and the condensation section 902 of the heat pipe 9. When the evaporation section 901 is heated, the working medium evaporates in the evaporation section 901, absorbs heat and is converted into steam. The steam is transmitted to the condensation section 902 through the capillary tube, and then cools and condenses into liquid in the condensation section 902, releasing the absorbed heat. The liquid returns to the evaporation section 901 by gravity, and the circulation is restarted, thereby achieving cooling of the grate 7.

[0029] Preferably, the grate 7 is filled with heat-conducting fillers 705 around the evaporation tubes, so that the heat generated by the combustion of fuel on the grate upper plate 702 can be better conducted to the evaporation tubes and dissipated.

[0030] It also includes an air circulation fan 11. The side of the furnace body 1 is provided with a hot air rising channel 10 connecting the air circulation fan 11 and the heat exchange tube 5, and the condensation section 902 is installed in the hot air rising channel 10 of the furnace body 1; the air blown out by the air circulation fan 11 absorbs the temperature of the surface of the condensation section 902 in the hot air rising channel 10, dissipates heat to the condensation section 902, and then enters the heat exchange tube 5 of the heat exchange chamber 3. After being heated twice in the heat exchange tube 5, it is blown out through the warm air outlet 6; the air from the air circulation fan 11 can not only dissipate heat to the condensation section 902, but also absorb the heat of the condensation section 902, thereby initially heating the air. After the air is initially heated, it is heated twice by the heat exchange tube 5, and the temperature of the air finally blown out from the warm air outlet 6 is higher, thereby improving the heat utilization efficiency.

[0031] Furthermore, a number of heat dissipation fins 903 are arranged at intervals on the condensing section 902, so that the heat exchange area of ​​the condensing section 902 is larger, the heat dissipation speed is faster, and the heat dissipation effect is better, so that the heat of the evaporating section 901 can be taken away faster, and the evaporating section 901 has a better cooling effect on the grate 7.

[0032] Because biomass fuel has the characteristic of high volatility, a secondary air duct 12 is also installed on the upper side of the combustion chamber 2. The secondary air duct 12 is provided with a secondary air outlet hole 13 connected to the combustion chamber 2, and the inlet of the secondary air duct 12 is connected to the combustion-supporting fan 8; the air generated by the combustion-supporting fan 8 is divided into two streams. The first stream of air first enters the primary air channel 701 of each furnace, and then is sprayed into the combustion chamber 2 through the primary air outlet hole 703 in a direction parallel to the surface of the grate 7 to assist the combustion of the fuel. The flue gas generated by the combustion flows upward along the combustion chamber 2, and then leaves the stove through the heat exchange chamber and the smoke exhaust pipe 4 in turn; the second stream of air first enters the secondary air duct 12, and then is evenly sprayed into the space in the combustion chamber 2 through a row of secondary air outlet holes 13 thereon to assist combustion.

[0033] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A wind-heated civilian stove equipped with a heat pipe cooling grate, comprising a stove body (1), a combustion chamber (2) provided in the stove body (1), a heat exchange chamber (3) provided above the combustion chamber (2), the heat exchange chamber (3) being connected to a smoke exhaust pipe (4), a heat exchange pipe (5) provided in the heat exchange chamber (3), and a warm air outlet (6) provided on the front side of the heat exchange chamber (3); an ash chamber (16) provided below the combustion chamber (2), the ash chamber (16) being provided with an ash discharge door (17); and a hopper (14) connected to a feeding device (15), characterized in that: A grate (7) is installed in the combustion chamber (2), and the grate (7) is provided with a primary air channel (701) and a grate upper plate (702). The inlet of the primary air channel (701) is connected to the combustion-supporting fan (8), and the primary air channel (701) is provided with a primary air outlet hole (703) opening toward the upper surface of the grate upper plate (702). The combustion chamber (2) also includes a heat pipe (9) for dissipating heat from the grate (7), and the heat pipe (9) includes an evaporation section (901) installed in the grate (7). 1), and a condensing section (902) connected to the evaporating section (901), the condensing section (902) being installed in a hot air ascending channel (10) of the furnace body (1); and also including an air circulation fan (11), the air blown out by the air circulation fan (11) absorbs heat from the condensing section (902) in the hot air ascending channel (10), enters the heat exchange tube (5) of the heat exchange chamber (3), is heated twice in the heat exchange tube (5), and is blown out through a warm air outlet (6).

2. The air-heating civilian stove equipped with a heat pipe cooling grate according to claim 1, characterized in that: A plurality of heat dissipation fins (903) are arranged at intervals on the condensation section (902).

3. The air-heated civilian stove equipped with a heat pipe cooling grate according to claim 1, characterized in that: An air guide plate (704) is provided above the primary air outlet hole (703), and the air guide plate (704) is arranged parallel to the grate upper plate (702).

4. The air-heated civilian stove equipped with a heat pipe cooling grate according to claim 1, characterized in that: A secondary air duct (12) is also installed on the side of the combustion chamber (2). The secondary air duct (12) is provided with a secondary air outlet hole (13) connected to the combustion chamber (2). The inlet of the secondary air duct (12) is connected to the combustion-supporting fan (8).

5. The air-heating civilian stove equipped with a heat pipe cooling grate according to claim 1, characterized in that: A plurality of grates (7) are provided and arranged in parallel at intervals in the combustion chamber (2), and an ash drop opening (18) is formed between two adjacent grates (7).

6. The air-heating civilian stove equipped with a heat pipe cooling grate according to claim 5, characterized in that: The grate upper plate (702) is tilted toward the ash drop opening (18).

Images