CN104566486A - Novel energy-saving lignite furnace chimney water jacket heater device - Google Patents

Abstract

The invention relates to an energy-saving equipment for waste heat recovery and reuse, in particular to a novel energy-saving chimney water jacket heating furnace device for a wood-coal stove. Including flue outlet, flue outlet sealing ring groove, fluid inlet, cylinder inner wall, cylinder outer wall, insulation layer, support pipe, inner fin, cylinder bottom, flue inlet, flue inlet sealing ring groove, mouth threaded hole, smoke Road inlet sealing ring, fluid outlet, double inlet faucet, fastening pipe, temperature measuring device, air hole, flue outlet sealing ring, fixing device, the outer wall of the cylinder and the bottom of the cylinder form a cavity, and the inner wall of the cylinder divides the cavity into Two parts, the inner side is the flue gas channel, the outer side is filled with water, the inner wall of the cylinder is fixedly connected with the flue outlet and the flue inlet, and the insulation layer wraps the entire outer wall and bottom of the cylinder. The present invention aims at the disadvantage of large sensible heat loss caused by the flue gas of the wood-fired smoke stove, utilizes the waste heat of the flue gas to realize secondary utilization of heat energy, reduces energy consumption, improves air quality, and uses the waste heat of the flue gas to heat water at the same time, meeting the needs of daily life .

Description

A new type of energy-saving wood-coal furnace chimney water jacket heating furnace device

technical field

The patent of the present invention relates to a waste heat recovery and reuse energy-saving equipment, in particular to a new type of energy-saving wood-coal furnace chimney water jacket heating furnace device.

Background technique

The coal-fired stove is a kind of heating furnace widely used in rural areas at present. It uses coal, firewood, straw, forestry waste, etc. as fuel. It is mainly used for cooking, heating, and heating. In recent years, it has also been gradually used in greenhouse heating. It is conservatively estimated that by the end of 2013, the number of coal wood stoves in my country will reach 180 million households. The thermal efficiency of wood-fired stoves is very low, generally about 30%. The energy loss of wood-fired stoves is very large, including sensible heat taken away by flue gas, heat loss when fuel is not completely burned, heat loss from the outer surface of the equipment, and heat loss from the equipment. Radiation and outgassing heat loss when the cover, door, etc. are opened, sensible heat taken away by equipment slag, fly ash, residual material, etc., and heat storage loss of equipment, etc. Among them, the waste heat loss taken away by the flue gas is the largest, which is about 40-50% of the calorific value of the fuel. Xiao Chunjun, Gong Huaitao, Fan Zhijie, etc. reported on the practice of reusing the waste heat of heating furnaces. They believed that the waste heat of gaseous carriers with a temperature greater than 180°C had usable value, and put forward the principle of "cascaded utilization, high quality and high use".

At present, the equipment for reusing high-temperature flue gas from wood-fired furnaces directly connects the flue gas pipes to the heat exchange medium pipes to recover the waste heat of the flue gas. The heat transfer area between the flue gas and the heat exchange medium is not large enough, and the structure is too complicated. The gas is seriously lost in the process of reflux and heat exchange, resulting in a part of the waste heat of the flue gas that cannot be recovered. The cost of the whole set of equipment is high, and the complicated process is not conducive to popularization and use in rural areas, and its wide applicability is poor. A new type of energy-saving wood-coal stove chimney water jacket heating furnace device, by adding heat transfer fins in the flue gas pipe, the heat transfer area of the flue gas is increased, and it is directly connected to the flue gas outlet of the firewood-coal stove, and can be heated at any time Hot water solves the problem of large amount of hot water used in rural areas in winter. It is simple and practical, and has good wide applicability.

Contents of the invention

The present invention aims to solve the above problems. It overcomes the many shortcomings of high exhaust gas temperature, serious heat loss, and environmental pollution, realizes secondary utilization of heat energy, reduces energy consumption, improves air quality, and provides hot water. Meet the needs of rural daily life in winter. The technical scheme that the present invention adopts is as follows:

A new energy-saving wood-coal stove chimney water jacket heating furnace device, including flue outlet, flue outlet sealing ring groove, fluid inlet, cylinder inner wall, cylinder outer wall, insulation layer, support pipe, inner fin, cylinder bottom, flue Inlet, flue inlet sealing ring groove, flue inlet threaded hole, flue inlet sealing ring, fluid outlet, double inlet tap, fastening tube, thermocouple, thermocouple socket, digital thermometer, air hole, flue outlet threaded hole 1. Flue outlet sealing ring, the outer wall of the cylinder and the bottom of the cylinder form a cavity, the inner wall of the cylinder divides the cavity into two parts, the inner side is the flue gas channel, and the outer side is filled with the heated fluid. The entrance of the channel is fixedly connected, the insulation layer wraps the entire outer wall and the bottom of the cylinder, and holes are opened on the upper, lower and surrounding sides, and two fluid outlets are installed on the bottom of the outer wall of the cylinder to connect with the double inlet faucet.

Further, three support pipes are fixedly distributed around the outer wall of the above-mentioned cylinder, and a fastening pipe is respectively hinged through the insulation layer, the purpose of which is to meet the installation requirements under different conditions.

Further, the above-mentioned flue outlet is respectively connected with the inner wall of the cylinder and the upper part of the outer wall of the cylinder, three flue outlet threaded holes are evenly distributed at the flue outlet, and the flue outlet sealing ring groove is internally processed, and the flue outlet sealing ring is installed in it. The purpose of the ring is to combine bolts and sealing rings to strengthen the tightness of the connection between the chimney and the heating furnace. The inlet of the flue is respectively connected to the inner wall of the cylinder and the lower part of the outer wall of the cylinder. Internally process the flue inlet sealing ring groove, and install the flue inlet sealing ring therein.

Further, the inner wall of the above-mentioned cylinder, that is, nine inner fins are evenly distributed in the flue and fixedly connected with the inner wall of the cylinder respectively, so as to increase the heat transfer area of the flue gas and improve the utilization rate of the waste heat of the flue gas.

Further, the above insulation layer adopts materials with a heat transfer coefficient of 0.7W/(m·℃) to reduce the heat transfer efficiency and reduce the heat loss of the heating furnace. The bottom of the cylinder and the horizontal plane form an angle of 15° to ensure that the The water is completely drained to avoid corrosion of the cylinder.

Further, a fluid inlet, a thermocouple socket and an air hole are opened on the top of the outer wall of the above-mentioned cylinder and around the flue inlet. These three openings pass through the insulation layer, and the digital display thermometer and the thermocouple connection extend into the cylinder from the thermocouple socket.

The present invention has the following advantages: due to the adoption of the above technical scheme, the present invention directly passes the high-temperature flue gas discharged from the coal-fired furnace into the inner cylinder of the heating furnace, utilizes the inner cylinder wall and inner fins to absorb the heat of the flue gas, and then transfers the waste heat Passed to the water in the cylinder cavity, heating the water. The invention is energy-saving and environment-friendly, realizes the secondary utilization of heat energy, reduces energy consumption, saves energy, improves air quality, and at the same time uses the waste heat of flue gas to heat water, and the hot water meets the needs of daily life in rural areas in winter. There are many disadvantages of serious heat loss and environmental pollution.

Description of drawings

Fig. 1: the overall assembly structure drawing of device of the present invention;

Fig. 2: the general structural diagram of device of the present invention;

Figure 3: Top view in Figure 2;

Figure 4: Top view in Figure 2;

Fig. 5: the structural diagram of the temperature measuring mechanism of the device of the present invention;

Fig. 6: the overall structural diagram of device cylinder of the present invention;

Figure 7: A-A sectional view in Figure 6;

Figure 8: B-B sectional view in Figure 6;

Fig. 9: Structural diagram of the double inlet faucet of the device of the present invention.

Symbol Description

1. Flue outlet 2. Flue outlet sealing ring groove, 3. Fluid inlet, 4. Inner wall of the cylinder, 5. Outer wall of the cylinder, 6. Insulation layer, 7. Support pipe, 8. Inner fin, 9. Bottom of the cylinder , 10 flue inlet, 11. Flue inlet sealing ring groove, 12. Flue inlet threaded hole, 13. Flue inlet sealing ring, 14. Fluid outlet, 15. Double inlet faucet, 16. Fastening pipe, 17. Thermocouple, 18. Thermocouple socket, 19. Digital display thermometer, 20. Air hole, 21. Flue outlet threaded hole, 22. Flue outlet sealing ring.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Example:

As shown in Figures 1-8, a new type of energy-saving wood-coal stove chimney water jacket heating furnace device of the present invention includes a flue outlet 1, a flue outlet sealing ring groove 2, a fluid inlet 3, a cylinder inner wall 4, and a cylinder outer wall 5 , thermal insulation layer 6, support pipe 7, inner fin 8, tube bottom 9, flue inlet 10, flue inlet sealing ring groove 11, flue inlet threaded hole 12, flue inlet sealing ring 13, fluid outlet 14, double Inlet faucet 15, fastening pipe 16, thermocouple 17, thermocouple socket 18, digital display thermometer 19, air hole 20, flue outlet threaded hole 21, flue outlet sealing ring 22, the outer wall of the cylinder 5 and the bottom of the cylinder 9 A cavity is formed, and the inner wall 4 of the cylinder divides the cavity into two parts. The inner side is a flue gas channel, and the outer side is filled with heated fluid. The inner wall 4 of the cylinder is fixedly connected with the flue outlet 1 and the flue inlet 10 respectively. The whole cylinder outer wall 5 and the cylinder bottom 9 are wrapped, and holes are opened up, down and around. Two fluid outlets 14 are installed on the bottom of the cylinder outer wall 5 and connected with double inlet faucets 15 .

Preferably, three support pipes 7 are fixedly distributed around the outer wall 5 of the cylinder, and a fastening pipe 16 is respectively hinged through the insulation layer 6, the purpose of which is to adapt to installation requirements under different conditions.

The preferred flue outlet 1 is respectively connected to the upper part of the cylinder inner wall 4 and the cylinder outer wall 5, and three flue outlet threaded holes 21 are evenly distributed in the flue outlet 1, and the flue outlet sealing ring groove 2 is internally processed, and therein The flue outlet sealing ring 22 is installed, and its purpose is to combine the bolt and the sealing ring to strengthen the sealing of the connection between the chimney and the heating furnace. Three flue inlet threaded holes 12 are arranged, and the flue inlet sealing ring groove 11 is processed internally, and the flue inlet sealing ring 13 is installed therein.

Preferably, the inner wall of the cylinder 4 is inside, that is, nine inner fins 8 are evenly distributed in the flue and fixedly connected with the inner wall 4 of the cylinder respectively, so as to increase the heat transfer area of the flue gas and improve the utilization rate of the waste heat of the flue gas.

The preferred insulation layer is made of materials with a heat transfer coefficient of 0.7W/(m·℃) to reduce the heat transfer efficiency and heat loss of the heating furnace. The bottom of the cylinder and the horizontal plane form an angle of 15° to ensure that the water in the furnace can Drain completely to avoid corrosion of the cylinder.

Fluid inlet 3, thermocouple socket 18 and air hole 20 are opened around the top of the preferred cylinder outer wall 5 and the flue inlet 10, these three openings pass through the insulation layer 6, wherein the digital display thermometer 19 and the thermocouple 17 are connected from the thermocouple socket Stretch in the cylinder in 18. the

The working process of a new energy-saving wood-coal stove chimney water jacket heating furnace device is as follows: when in use, the flue inlet 10 is connected to the flue gas outlet of the furnace, and is fixed through the flue inlet threaded hole 12 on the flue inlet 10, and the flue gas The flue outlet 1 is connected with the chimney extending to the outside, and is fixed through the flue outlet threaded hole 21, and the flue inlet sealing ring 1 and the flue outlet sealing ring 22 are installed in the flue inlet sealing ring groove 11 and the flue outlet sealing ring respectively. Ring groove 2 ensures that smoke does not leak. Then, inject water into the sleeve through the fluid inlet 3, and the volume of the sleeve is about 27L. When igniting the household stove, the flue gas constantly passes through the inner tube of the heating furnace, and the water is heated while exhausting the flue gas. When using hot water, directly open the double inlet tap 15 to drain water.

The energy-saving efficiency and heat preservation effect of the heating furnace are calculated as follows.

The temperature of the flue inlet 10 is T ₁ =310°C, the temperature of the flue outlet 1 is T ₂ =135°C, the inner diameter of the flue of the heating furnace is d ₁ =154mm, the gas composition of the flue (the composition of the flue gas CO 13% H2O 11% N276%, the average constant pressure specific heat capacity at 100°C to 600°C is 0.27kcal/kg°C), the average flue gas specific gravity is calculated as 1.25kg/ ^m3 , and the average flue gas flow rate is calculated as v=0.95m /s, the heat loss of water absorbing waste heat and heat transfer is 10%.

The total weight of flue gas flowing per hour is

M=π×0.154 ² ×0.95×3600×1.25＝79.59kg

The waste heat of flue gas available per hour is

Q＝79.59×0.27×(310-135)×(1-10%)＝3384.57kcal/h

If the furnace is used for 8 hours a day and about 165 days a year, the calorific value of coal is calculated at 5000kcal/kg, and the price of coal per ton is calculated at 500 yuan.

The annual savings per furnace is

Y＝3384.57/5000×8×165＝893.5 yuan

The heat preservation effect of the heating furnace is verified by the heat conduction calculation of the multi-layer cylinder wall. The diameter of the outer wall of the cylinder 5 is Φ320×2, the thickness of the insulation layer 6 is 50mm, and the thermal conductivity of the outer wall of the cylinder λ ₁ = 45W/(m·℃). The thermal conductivity of layer 6 is λ ₂ =0.7W/(m·°C), the heated water temperature t ₁ =70°C, the ambient temperature t ₂ =20°C, the inner radius r ₁ of the cylinder outer wall 5 =158mm, and the outer radius r ₂ =160mm, the radius of the insulation layer r ₃ =210mm.

When there is no insulation layer 6, the heat loss is

${\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; ln</span>}\frac{{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1123000</span>}\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; m</span>}$

When there is an insulation layer 6, the heat loss is

${\mathrm{<span\; class="notranslate">\; q</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span><span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}\mathrm{<span\; class="notranslate">\; ln</span>}\frac{{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\mathrm{<span\; class="notranslate">\; ln</span>}\frac{{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}}{{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 805.13</span>}\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; m</span>}$

The insulation effect of insulation layer 6 is

η=(q ₂ −q ₁ )/q ₂ ×100%=99.8%

It can be seen from the above examples that a new type of energy-saving wood-coal stove chimney water jacket heating furnace device of the present invention has simple structure, low cost, obvious heat preservation effect of 99.8%, obvious environmental protection, energy-saving effects, and remarkable economic benefits. Each set of equipment Conservative can save about 900 yuan in expenses every year.

The basic principles, main features and advantages of the present invention are shown and described above. The present invention is not limited by the above-mentioned embodiments, and what described in the above-mentioned embodiments and the description only illustrates the principle of the present invention, and the present invention also has various changes and improvements without departing from the spirit and scope of the present invention. These changes and Modifications are within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. A new type of energy-saving wood-coal stove chimney water jacket heating furnace device, characterized in that it includes a flue outlet (1), a flue outlet sealing ring groove (2), a fluid inlet (3), a cylinder inner wall (4), Tube outer wall (5), insulation layer (6), support pipe (7), inner fins (8), tube bottom (9), flue inlet (10), flue inlet sealing ring groove (11), flue Inlet threaded hole (12), flue inlet sealing ring (13), fluid outlet (14), double inlet faucet (15), fastening tube (16), thermocouple (17), thermocouple socket (18), digital Display thermometer (19), air hole (20), flue outlet threaded hole (21), flue outlet sealing ring (22), the outer wall of the cylinder (5) and the bottom of the cylinder (9) form a cavity, and the inner wall of the cylinder (4) Divide the cavity into two parts, the inner side is the flue gas channel, and the outer side is filled with heated fluid. The inner wall of the cylinder (4) is fixedly connected with the flue outlet (1) and the flue inlet (10) respectively. The insulation layer (6) Wrap the entire cylinder outer wall (5) and cylinder bottom (9), and have holes on the top, bottom and all around. Two fluid outlets (14) are installed at the bottom of the cylinder outer wall (5) and are connected to the double inlet faucet ( 15) Connect. 2. A novel energy-saving wood-coal stove chimney water jacket heating furnace device according to claim 1, characterized in that three support pipes (7) are fixedly distributed around the outer wall of the cylinder (5), and pass through the insulation layer (6 ) respectively hinge a fastening pipe (16). 3. A new type of energy-saving wood-coal stove chimney water jacket heating furnace device according to claim 1, characterized in that the flue outlet (1) is respectively connected to the upper part of the cylinder inner wall (4) and the cylinder outer wall (5), Three flue outlet threaded holes (21) are evenly distributed at the flue outlet (1), and the flue outlet sealing ring groove (2) is processed internally, and the flue outlet sealing ring (22) is installed therein, and the flue inlet (10) are respectively connected with the lower part of the cylinder inner wall (4) and the cylinder outer wall (5), three flue inlet threaded holes (12) are evenly distributed at the flue inlet (10), and the flue inlet sealing ring groove is processed internally (11), and install the flue inlet sealing ring (13) therein. 4. A new type of energy-saving wood-coal furnace chimney water jacket heating furnace device according to claim 1, characterized in that the inner wall of the cylinder (4) is internally measured, that is, nine inner fins (8) are evenly distributed in the flue and respectively It is fixedly connected with the inner wall of the cylinder (4). 5. A novel energy-saving wood-coal stove chimney water jacket heating furnace device according to claim 1, characterized in that the insulation layer (6) adopts a material with a heat transfer coefficient of 0.7W/(m·℃), and the bottom of the cylinder ( 9) Form an angle of 15° with the horizontal plane. 6. According to claims 1 and 3, a novel energy-saving wood-coal stove chimney water jacket heating furnace device is characterized in that a fluid inlet (3) is opened around the top of the cylinder outer wall (5) and around the flue inlet (10) , thermocouple socket (18) and air hole (20), these three openings pass through the insulation layer (6), wherein the digital display thermometer (19) and thermocouple (17) are connected and extend into the cylinder from the thermocouple socket (18) .