[0030] The present invention will be described in detail below with reference to the drawings and specific embodiments.
[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified, rather than indicating or implying that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.
[0032] Reference figure 1 , An S-shaped flue gas process biomass pellet/briquette air preheating environmental protection stove includes air inlet 1, rear tribe ash hopper 2, tail flue 3, air pipe interlayer 4, threaded pipe 5, water outlet 6, Air preheating pipe 7, chimney 8, water pipe row 9, water tank 10, refractory furnace wall 11, stove 12, upper stove cover 13, lower stove cover 14, water inlet 15, middle flue 16, hot air pipe 17, Upper furnace 18, furnace door 19, upper grate 20, preheated air outlet 21, lower furnace 22, lower grate 23, front tribe ash hopper 24, air preheating pipe manifold 25, water jacket inner cylinder 26, Water jacket outer cylinder 27, lower grate hinge 28, furnace door ventilation cover 29, furnace door slide 30, furnace door vent 31, air inlet regulating door 32, air inlet slide 33 and shell 34.
[0033] The front wall and the top wall of the shell 34 are provided with a water tank 10 outside and in the middle. The water tank 10 arranged in the middle divides the inside of the shell 34 into a flue and a furnace; the flue is divided into a middle flue 16 by a water pipe row 9 And the tail flue 3, the lower part of the furnace is provided with an upper grate 20, the upper grate 20 divides the furnace into an upper furnace 18 and a lower furnace 22, the bottom of the lower furnace 22 is provided with a lower grate 23, and the lower grate 23 is provided with ventilation The top of the upper hearth 18 is provided with a cone-shaped stove 12, the back side of the hearth is provided with a middle flue 16, the upper part of the upper hearth 18 communicates with the upper part of the middle flue 16, and the lower part of the middle flue 16 communicates with the tail flue 3. The top of the road 3 communicates with the chimney 8. The flue gas of the environmental protection stove travels along the lower hearth 22 and the upper hearth 18 through the middle flue 16 to the tail flue 3, and finally is discharged through the chimney 8, and its flow path is S-shaped. The front wall of the shell 34 is provided with a furnace door 19, the lower part of the tail flue 3 is provided with a rear tribe ash hopper 2, and a front tribe ash hopper 24 is provided under the lower grate 23. Both the rear tribe ash hopper 2 and the front tribe ash hopper 24 are Drawer type. The stove 12 is provided with an upper stove cover 13 and a lower stove cover 14. The furnace 18 is covered with a refractory furnace wall 11 for heat insulation, and the lower furnace 22 is a water-cooled furnace wall.
[0034] Reference figure 1 with figure 2 , The tail flue 3 is provided with an air preheating device. The air preheating device includes an air preheating pipe manifold 25 and a number of air preheating pipes 7. An air inlet 1 is provided under one end of the air pipe interlayer 4, and an air inlet 1 is provided under one end of the air pipe interlayer 4, and an air inlet 1 is provided above the other end. The inlet of the air preheating pipe 7 is connected. The ends of the air preheating pipe 7 are connected to the inlet of the air preheating pipe manifold 25. The outlet of the air preheating pipe manifold 25 is connected to one end of the hot air pipe 17, and the hot air pipe 17 The other end is the preheated air outlet 21, which is located below the upper grate 20, and the air preheating pipe 7 is arranged in the tail flue 3. The air preheating pipes 7 are arranged in a staggered arrangement, and the hot air pipe 17 is a double-layer structure with insulation material sandwiched between the two layers. The hot air pipe passes through the water tank 10 located on the side wall of the shell. A number of threaded pipes 5 communicating with the water tank 10 are arranged staggered below the air preheating pipe 7, and the threaded pipes 5 have an external thread structure.
[0035] Reference image 3 , The housing 34 is provided with a water sleeve row 9 communicating with the water tank 10, the water sleeve row 9 is blocked between the middle flue 16 and the tail flue 3, and the water sleeve row 9 is composed of several water sleeves Each water sleeve includes a water sleeve inner cylinder 26 and an outer sleeve cylinder 27 connected at the bottom, an inner cylinder 26 and an outer sleeve cylinder 27, and the upper part is fixedly connected by a radial steel sheet.
[0036] Reference Figure 4 , The lower grate 23 is provided with two layers of radial air inlets, and the lower grate 23 is connected with a lower grate hinge 28 for adjusting the size of the air inlet through a pin. Rotating the grate hinge 28 can control the amount of air entering the furnace. The adjustment function of the lower grate hinge 28 ensures that the secondary combustion excess air coefficient is greater than 1; the lower grate hinge 28 has a double-layer structure, and the lower grate hinge 28 is provided with an air inlet shape on the lower grate 23 The two-layer hinges are rotated to make the through-holes on the lower grate hinge 28 and the two radial air inlets on the lower grate 23 partially overlap or align with the through holes of exactly the same size. Air is allowed to enter the hearth from below or the slag on the lower grate 23 is collected into the former tribe ash hopper 24. Adjusting different angles can control the amount of air entering the furnace.
[0037] Reference Figure 5 The furnace door 19 is provided with a furnace door slide 30 and a furnace door vent 31, and a furnace door vent cover 29 is slidably connected to the furnace door slide 30. The adjustment function of the furnace door vent cover 29 ensures that the mixed gas is completely in the upper furnace combustion. The furnace door vent cover 29 can slide along the furnace door slide rail 30 to adjust the area of the furnace door vent 31 to cover, thereby controlling the amount of air allowed to enter the upper furnace 18.
[0038] Reference Image 6 , The air inlet 1 is provided with a slidingly connected air inlet regulating door 32 and an air inlet slide 33; the air inlet regulating door 32 can slide along the air inlet slide 33 to adjust the opening of the air inlet 1, thereby controlling the preheating air The amount; the adjustment function of the air inlet regulating door 32 ensures that the excess air coefficient of a combustion is less than 1.
[0039] The combustion method of environmentally friendly stove fuel is graded air distribution. The source of the primary air is the preheated air outlet 21, the secondary air comes from the lower grate hinge 28 of the lower grate 23, and the exhaust air comes from the furnace door 19 The furnace door vent 31.
[0040] See Figure 1 to Figure 6 , The air flow of a biomass briquette/briquette S-shaped air preheating environmentally friendly stove is: air flows from the air inlet 1 through the air pipe interlayer 4 to the staggered air preheating pipe 7 and the tail flue 3 The flue gas exchanges heat into preheated air. The preheated air passes through the air preheating pipe manifold 25 and converges into the hot air pipe 17 covered with insulation layer, and flows along the hot air pipe 17 to the preheated air outlet of the lower furnace 22 twenty one.
[0041] The flue gas flow of a biomass briquette/briquette S-shaped air preheating environmental protection stove of the present invention is: the biomass briquette fuel/briquette absorption air preheating pipe 7 placed on the upper grate 20 The heat of the preheated air is combusted with the preheated air at low temperature to produce a reducing atmosphere, and at the same time reduce the production of NOx. The incomplete combustion products fall to the lower grate 23 and react with the air entering from the lower grate 23 to generate flue gas. The flue gas rises to the upper furnace 18 and mixes with the reducing atmosphere to reduce NOx. The mixed gas rises and ventilates from the furnace door. The air flowing in from the port 31 reacts and burns completely, flows along the upper furnace 18 through the middle flue 16 to the tail flue 3, exchanges heat with the threaded tube 5 and the air preheating pipe 7 during the flow, and finally flows through the chimney 8. .
[0042] The water flow of a biomass briquette/briquette S-shaped air preheating environmental protection stove according to the present invention is: cold water flows from the water inlet 15 into the water tank 10 to absorb the heat of the furnace, and part of the cold water flows into the water sleeve row 9 , The water in the outer layer of the water jacket row 9 flows upward when heated, and the water in the inner layer flows downward to form a backflow. Part of the cold water passes through the threaded tube 5 to absorb the heat of the tail gas. Finally, the hot water is discharged from the water outlet 6.
[0043] The working principle of this stove is:
[0044] The air flows through the air inlet 1 and the air duct interlayer 4 to the air preheating duct 7 to produce preheated air, the preheated air flows out through the hot air duct 17 and the preheated air outlet 21, and the preheated air from the preheated air outlet 21 is The primary combustion provides ignition heat and oxygen, and the biomass briquette/briquette placed on the upper grate 20 is combusted at a low temperature under the condition that the excess air coefficient is less than 1, to generate a reducing atmosphere and reduce the generation of NOx. Completely combusted solid products; incompletely combusted solid products fall to the lower grate 23 and mix with the air entering the hearth from the lower grate 23. When the excess air coefficient is greater than 1, the secondary combustion will continue, resulting in secondary combustion Smoke. The flue gas flows upward and mixes with the reducing atmosphere at the upper grate 20 to become a mixed gas, NOx is reduced, and the mixed gas continues to rise to react with the air at the furnace door vent 31 to complete the combustion process. The adjustment function of the air inlet regulating door 32 ensures that the excess air coefficient of primary combustion is less than 1; the adjustment function of the lower grate hinge 28 ensures that the excess air coefficient of secondary combustion is greater than 1; the adjustment function of the furnace door vent cover 29 ensures that the mixed gas is at the top The furnace is completely burnt. The flue gas flows along the upper hearth 18 through the middle flue 16 to the tail flue 3. As the flue gas flow trajectory is S-shaped, part of the fly ash particles fall out of the flue gas and fall into the back tribe ash bucket 2 due to inertia during this process. in. The flue gas flowing to the tail flue 3 contains fly ash particles colliding with the staggered threaded pipe 5 and air preheating pipe 7, and the fly ash particles hit the threaded pipe 5 and air preheating pipe 7 and fall into the back tribe ash In bucket 2, the purpose of reducing fly ash is realized. The cold water in the water tank 10 absorbs the heat of the furnace, the water in the threaded tube 5 absorbs the heat of the tail flue gas, the outer water in the water jacket row 9 is heated and flows upwards, and the inner water flows downwards to form a return flow, which fully absorbs the fuel combustion Heat. The lower grate hinge 28 is opened regularly to collect the ash falling on the lower grate 23 into the front tribe ash hopper 24 to collect coal ash. When cooking utensils are used, opening the upper stove cover 13 and the lower stove cover 14 can meet the daily cooking needs of residents, and cover the upper stove cover 13 and the lower stove cover 14 when not in use to prevent smoke from flowing out. When grilling food in the north, you can open the upper stove cover 13 and cover the upper and lower stove cover 14 to put the food on the refractory stove wall around the stove to bake the food.
[0045] Water is injected into the water tank 10 from the water inlet 15 and absorbs the heat of the furnace 15. Part of the water flows into the water jacket row 9. The heat exchange temperature between the outer water of the water jacket and the flue gas in the flue is higher, and it flows upward, and the inner water temperature of the water jacket is higher. Flow down low to form reflux. Part of the water passes through the threaded pipe 5 and absorbs the heat of the tail flue gas in the tail flue 3, and finally hot water flows out from the water outlet 6. Maximize the absorption of fuel heat and improve thermal efficiency.
[0046] The invention realizes the staged combustion of biomass briquettes/briquettes, reduces NOx emission by staged air distribution, and promotes ignition and combustion by setting air preheating pipes. The fly ash emission is reduced by designing the S-shaped flow trajectory of the flue gas and setting the way that the flue gas collides with the threaded pipe and the air preheating pipe. A water tank is arranged around the furnace, a water sleeve row is arranged in the middle of the flue, and a threaded water pipe is arranged in the tail flue to enhance the heat absorption of water, improve fuel utilization efficiency and realize clean combustion.
