CN106907703A - Sufficient oxygen and uniform air supply combustion furnace - Google Patents

Abstract

The invention discloses a combustion furnace with uniform oxygen supply and air supply, which comprises a heat insulation layer, a furnace wall and an air blower, wherein the heat insulation layer is arranged outside the cylindrical furnace wall, and fuel is fed from the top of the furnace wall; the bottom of the furnace wall is provided with an ash discharge port, and an ash discharge valve is arranged on the ash discharge port; a triangular ventilation cavity is arranged between the outer side of the furnace wall and the heat insulation layer, the inclined edge of the triangular ventilation cavity and the furnace wall form an included angle a = 15-25 degrees, and the ventilation cavity is connected with a blower through a ventilation pipe; three rows of ventilation holes are uniformly distributed on the furnace wall. The inner diameter of the cylindrical furnace wall is more than 20 cm. The height of the cylindrical furnace wall is 35-60 cm. Three rows of vent holes are uniformly distributed on the furnace wall, and the hole diameters of the vent holes from top to bottom are respectively 3 mm, 4 mm and 5 mm. The pitch of each row of ventilation holes is 3.5-4 cm. The combustion furnace with sufficient oxygen and uniform air supply has simple structure and ingenious arrangement, and can burn fuel with water content of more than 30 percent.

Description

Sufficient oxygen and uniform air supply combustion furnace

technical field

The invention relates to the technical field of combustion furnaces, in particular to a combustion furnace with sufficient oxygen and uniform air supply.

Background technique

The veneer of wood is the raw material for the production of plywood, blockboard, veneer and other wood-based panels. Most of the veneers are made by rotary cutting of logs. Because the veneer produced by rotary cutting contains a lot of water, it needs to be dried before it can be used to produce wood-based panels. The traditional drying method of wood veneer is natural drying. This method lasts a long time and requires a suitable natural environment and spacious site conditions. It is easily affected by the weather environment and is difficult to apply to industrialized large-scale production. In order to overcome the shortcomings of natural drying, people have invented ovens, drying rooms or special drying devices for drying. The wood boards are evenly distributed in the oven or drying room, and a certain gap is maintained, and heated by electric heating or fuel. Thereby the wood board is dried. At present, most wood manufacturers use waste boards and veneers as fuel to dry the wood veneers with the heat generated after burning, which requires a fuel-burning hot blast stove. Open literature also reports some devices that utilize the heat generated after fuel combustion to dry wood, such as:

1. Chinese patent: wood veneer drying device, application number: 201510521486.8, application date: 2015.08.24, applicant: Chongqing Zuoen Furniture Co., Ltd., address: 401233 Xinshi Centralized Industrial Park, Changshou District, Chongqing, inventor: Yang Lihong , Abstract: The invention discloses a wood veneer drying device, which includes a drying room, a drying mechanism and a board transportation mechanism. The drying mechanism includes a hot air box, an air inlet pipe and a hot air blower. Between the feed port and the discharge port of the drying room, the middle part of the hot air box group forms a transport channel for the wood veneer to pass through, and a breathable soft pressing block is fixed at the end of the hot air box, and the air jet pipe is inserted into the In the soft briquetting block, all the hot air boxes are connected to the hot air blower through the air inlet pipe. The plate transport mechanism includes a conveyor belt and a feed roller, and the feed roller is erected outside the feed port of the drying room; the conveyor belt is arranged up and down to form a conveyor belt. Group, the conveyor belt group is set between the two hot air box groups, the advantage of this scheme is that it is used in the drying of wood veneer, and it can ensure that it will not bend after drying.

2. Chinese patent: a veneer dryer, application number: 201310665088.4, application date: 2013.12.09, applicant: Jiangsu Happy Wood Industry Group Co., Ltd., address: 225248 Gaoxuji Town, Xiaoji Town, Jiangdu District, Yangzhou City, Jiangsu Province , Inventors: Liu Xiaobing, Shao Xuefen, Wang Daojiang, Huang Baoping, Lu Jiali, Liu Nianxiang, Abstract: This invention discloses a veneer dryer, which includes a plurality of heating plate groups and a plurality of driving drum groups arranged continuously and alternately in a plane ; Each heating plate group includes an upper heating plate and a lower heating plate, and the distance between the upper heating plate and the lower heating plate is greater than the thickness of the single plate; each driving roller group includes up and down oppositely arranged and oppositely turned, for clamping And convey the upper roller and the lower roller of the veneer, and the distance between the centers of two adjacent drive roller groups is smaller than the side length of the veneer parallel to the conveying direction. In the veneer dryer provided by this invention, the upper heating plate and the lower heating plate are used to dry the veneer from the upper and lower sides respectively. Since the upper heating plate and the lower heating plate are fixed, there will be no air flow, which improves the efficiency of the heat. Utilization rate, high drying efficiency, and the veneer is squeezed by the upper roller and the lower roller, which improves the flatness of the veneer. Since the heating plate group and the drive roller group are arranged in a plane, the veneer will not bend and reduce The proportion of broken veneers.

3. Chinese patent: veneer drying equipment, application number: 201310275598.0, application date: 2013.07.03, applicant: Yuan An, address: 545209 Liucheng Sitang Farm, Liuzhou City, Guangxi Zhuang Autonomous Region, inventors: Yuan An, Wang Daoxian, Abstract: The invention discloses a veneer drying equipment, which includes a box body with a material inlet and a material outlet, and an air heat exchanger. There is a discharge device, and a conveying device is arranged between the two; the conveying device includes a driving sprocket set and a driven sprocket set on the box body and an endless chain surrounding the two, and the endless chain is provided with intervals Multiple clamping rods; the partition between the uplink and downlink of the endless chain encloses the upper space in the box into a baking channel, the upper part of the baking channel is provided with a first cooling channel, and the bottom of the partition is provided with a second Two heat dissipation channels, the bottom plate of the first heat dissipation channel and the top plate of the second heat dissipation channel are distributed with a plurality of heat dissipation holes connected to the baking channel; the first heat dissipation channel and the second heat dissipation channel are respectively communicated with the air outlet of the air heat exchanger through the air pipe . Compared with the prior art, the invention can solve the problems of easy cracking, high energy consumption and low efficiency of the existing veneer during baking.

4. Chinese patent: vertical wood veneer dryer, application number: 201420816912.1, application date: 2014.12.22, patentee: Chen Yongjie, address: 545621 Bangcuntun, Liuhe Village, Jiangkou Township, Luzhai County, Liuzhou City, Guangxi Zhuang Autonomous Region, invented Person: Chen Yongjie, Abstract: A vertical wood veneer dryer, the conveying device includes a conveyor belt, the two sides of the conveyor belt are connected with side baffles extending upward at intervals, and a chain is formed by the side baffles on both sides and the top of the conveyor belt The wood veneer is restricted in the chain groove of vertical conveying; the heating assembly is installed on both sides of the wood veneer respectively, and the heating assembly is connected with the heat source, and there is an air supply hole on the side facing the wood veneer, which will The hot air generated by the heating assembly is blown to the side of the wood veneer to dry the wood veneer. Its advantage is that it is easy to put the wood veneer into the tank, no matter it is rainy weather or sunny weather, it can start production normally, the staff will not be exposed to the sun and rain, and the two sides of the wood veneer are evenly heated at the same time, thus speeding up production. The water in the wood veneer boils and evaporates, and the temperature of the wood veneer after being cooled by the cooling group before it comes out is not much different from the temperature of the air, which greatly improves the existing problem of high humidity after natural cooling.

5. Chinese patent: Wooden board drying roller kiln system and its special device, application number: 201210380033.4, application date: 2012.10.09, applicant: Su Xiongmeng, address: 537100 Guangxi Zhuang Autonomous Region Guigang City Square Mingzhu No. 2 409, invented Person: Su Xiongmeng, Abstract: This invention discloses a wood board drying roller kiln system and its special device. The system includes: hot blast furnace, kiln body, automatic adjustment control cabinet device, dust collector, hot air conveying pipeline, heat recovery pipeline , heat supply pipe, dehumidification pipe, dryer and blower; hot blast stove, hot blast stove includes: combustion chamber, hot air storage chamber, hot blast recovery port, cinder outlet, hot blast outlet, upper flue gas outlet and lower hot blast outlet; kiln body , The kiln body includes: dryer, heat recovery pipe, heat supply pipe and dehumidification pipe; the dryer frame of the dryer divides the kiln body into three parts: the upper, middle and lower parts, the middle part is the transmission part, and the upper and lower parts are the supply The hot part; the invention adopts an automatic control temperature adjustment device; the speed can be adjusted according to the required daily output. Driven by the upper and lower rollers, the operation is stable, the noise is low, safe and reliable, the operation is easy, and the plates in the kiln are neat, smooth and free of deformation. Equipped with reasonable air-introducing inner tubes, the hot air can directly contact the wood boards, which improves the drying efficiency, saves energy and reduces production costs.

The above-mentioned disclosed device for drying wood needs a hot blast stove that provides heat. However, the waste boards and veneers burned by hot blast stoves on the market are all dry. If the water content exceeds 20%, the combustion will be insufficient, black smoke will be generated, and the heat generated will be insufficient. A large amount of dry waste boards and veneers are needed to meet the needs of wood Veneer drying requirements. However, when dry waste boards and veneers are insufficient in rainy days, it is impossible to use waste boards and veneers with high water content as fuel to dry wood veneers. It virtually increases the workload of drying or drying waste boards and veneers.

Contents of the invention

The purpose of the present invention is to provide a kind of burner with sufficient oxygen and uniform air supply, which can be installed in the hot blast stove as the combustion chamber of the hot blast stove, and the burner can burn fuel with a water content exceeding 30%.

The technical scheme adopted in the present invention is:

A combustion furnace with sufficient oxygen uniform supply and air supply, which includes a heat insulation layer, a furnace wall and a blower. The heat insulation layer is arranged outside the cylindrical furnace wall, and fuel is input from the top of the furnace wall; There is an ash discharge port, and an ash discharge valve is installed on the ash discharge port; there is a triangular ventilation cavity between the outer side of the furnace wall and the heat insulation layer, and the angle between the hypotenuse of the triangular ventilation cavity and the furnace wall is a=15° -25°, the ventilation cavity is connected with the blower through the ventilation pipe; there are three rows of ventilation holes evenly distributed on the furnace wall.

The inner diameter of the cylindrical furnace wall is more than 20 centimeters.

The height of the cylindrical furnace wall is 35-60 cm.

Three rows of ventilation holes are evenly distributed on the furnace wall, and the apertures of the ventilation holes from top to bottom are 3 mm, 4 mm and 5 mm respectively.

The hole spacing of each row of ventilation holes is 3.5-4 cm.

The combustion furnace with sufficient oxygen and uniform air supply of the present invention has a simple structure and ingenious arrangement, and can be installed in the hot blast stove as a combustion chamber of the hot blast stove or as a combustion furnace with other functions. The fuel of the sufficient oxygen uniform supply air supply burner burns fully and rarely produces black smoke.

The present invention uses biomass fuels such as bark, broken wood, stalks and weeds for the combustion furnace with sufficient oxygen and uniform air supply, which can be fully burned. When the combustion furnace with sufficient oxygen and uniform air supply has 50% dry fuel When the temperature is stabilized, you can add fuel with a moisture content of 50%-70%, or you can burn weeds or fresh leaves that have just been felled from the mountain and do not need to be dried into the furnace for combustion. The temperature inside the furnace wall can reach above 1200°C .

Description of drawings

Fig. 1 is the structural representation of sufficient oxygen evenly sending air supply combustion furnace of the present invention;

The names of the serial numbers in the figure are:

1. Heat insulation layer, 2. Ventilation cavity, 3. Furnace wall, 4. Ventilation hole, 5. Ventilation pipe, 6. Blower, 7. Ash discharge port, 8. Ash discharge valve.

detailed description

In order to make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention and the accompanying drawings.

as the picture shows:

The combustion furnace with sufficient oxygen uniform delivery and air supply of the present invention comprises a heat insulation layer 1, a furnace wall 3 and a blower 6, and the heat insulation layer 1 is arranged outside the cylindrical furnace wall 3, and the fuel flows from the furnace wall 3 The top input; the bottom of the furnace wall 3 is provided with an ash outlet 7, and the ash discharge valve 8 is installed on the ash outlet 7; a triangular ventilation cavity 2 is provided between the outer side of the furnace wall 3 and the heat insulation layer 1, and the triangular ventilation The angle between the hypotenuse of the cavity 2 and the furnace wall 3 is a=15°-25°, and the ventilation cavity 2 is connected to the blower 6 through the ventilation pipe 5; the furnace wall 3 is evenly distributed with three rows of ventilation holes 4.

The inner diameter of the cylindrical furnace wall 3 is more than 20 centimeters.

The height of the cylindrical furnace wall 3 is 35-60 cm.

Three rows of ventilation holes 4 evenly distributed on the furnace wall 3, the apertures of the ventilation holes 4 from top to bottom are respectively 3 millimeters, 4 millimeters and 5 millimeters.

The hole pitch of each row of ventilation holes 4 is 3.5-4 centimeters.

The operating principle of the air-supply combustion furnace with sufficient oxygen uniform delivery of the present invention is as follows:

When it is necessary to burn fuel, turn on the blower 6, and the blower 6 will transport the air into the ventilation cavity 2 through the ventilation pipe 5, and enter the furnace wall 3 through the ventilation hole 4, and put the ignited fuel into the furnace wall from the top of the furnace wall 3 first. 3, then unignited fuel is replenished from the top of the furnace wall 3, and the subsequent addition of fuel is also dropped into from the top of the furnace wall 3.

application example

A wood processing factory in Hengxian County, Guangxi, originally used the "three-pass environmental protection and energy-saving hot air stove" to provide hot air to red-wrap wood boards; : Lu Zhoude, Address: No. 068, Huancheng East Road, Hengzhou Town, Hengxian County, Guangxi Zhuang Autonomous Region, 530300. Abstract: This invention discloses a three-pass environmental protection and energy-saving hot blast stove. The hot blast stove includes: the first layer of wall body, the second Layer wall body, third layer wall body, fourth layer wall body, fifth layer wall body, sixth layer wall body, seventh layer wall body, the first seven are inserted into each other and fixedly connected in turn; the first layer wall body The middle part is equipped with a first simplified body, and the outer circumference of the first cylinder is provided with multiple spiral heat transfer air channels, and the first simplified body is sealed and fixedly connected with the inner wall of the second wall through the heat transfer air channels; the second simplified body is connected with The 4th simplified body is fixedly connected, the 4th simplified body is fixedly connected with the top of the third layer wall, the 3rd simplified body is fixedly connected with the 5th simplified body; Inside the opening; the second wall is located between the first wall and the third wall, and the second wall is fixedly connected to the first wall through multiple heat transfer channels. High heat temperature, high heat utilization rate, small size, stable hot air temperature, no switching mechanism, long life, low maintenance cost, and low purchase cost. In the case of sufficient drying fuel, that is, waste boards and wood veneers, the heat provided by the "three-pass environmental protection and energy-saving hot air stove" is sufficient and will not produce black smoke, which can meet the needs of wood board drying production. Insufficient waste boards and veneers need to be added with wet waste boards and veneers. If the water content exceeds 25%, a large amount of black smoke will be generated, the fuel will not be fully burned, and the heat provided will not be sufficient to meet the needs of wood board drying production. Afterwards, the applicant installs the full-oxygen uniform air supply combustion furnace of the present invention on the bottom of the "three-pass environmental protection and energy-saving hot blast stove" and uses it as a combustion chamber. Fuel, you can add fuel with a water content of more than 50%, which rarely produces black smoke, and the temperature inside the furnace wall can reach above 1200 °C. In order to verify the combustion capability of the full-oxygen uniform air supply combustion furnace of the present invention, the applicant puts dry fuel accounting for 50% of the furnace volume into the furnace wall, and can add 50% of the furnace volume just from the hillside. The raw tree branches that were cut back were observed, and the fuel in the combustion furnace with sufficient oxygen and uniform air supply was fully burned, and the tail gas had almost no black smoke, and the temperature in the furnace wall reached more than 1200°C.

The above description is not a limitation to the present invention, and the present invention is not limited to the above-mentioned examples. Those of ordinary skill in the art, within the scope of the present invention, any changes, modifications, additions or replacements should belong to the present invention scope of protection.

Claims (6)

1. A combustion furnace with sufficient oxygen uniform supply and air supply, characterized in that it includes a heat insulation layer (1), a furnace wall (3) and a blower (6), and the heat insulation layer (1) is arranged on a cylindrical Outside the furnace wall (3), the fuel is fed from the top of the furnace wall (3); the bottom of the furnace wall (3) is provided with an ash discharge port (7), and the ash discharge port (7) is equipped with an ash discharge valve (8); A triangular ventilation cavity (2) is provided between the outer side of the furnace wall (3) and the heat insulation layer (1), and the included angle between the hypotenuse of the triangular ventilation cavity (2) and the furnace wall (3) is a=15 °-25°, the ventilation cavity (2) is connected to the blower (6) through the ventilation pipe (5); three rows of ventilation holes (4) are evenly distributed on the furnace wall (3). 2. The combustion furnace with sufficient oxygen and uniform air supply according to claim 1, characterized in that: the inner diameter of the cylindrical furnace wall (3) is more than 20 cm. 3. The combustion furnace with sufficient oxygen and uniform air supply according to claim 1, characterized in that: the height of the cylindrical furnace wall (3) is 35-60 cm. 4. The combustion furnace with sufficient oxygen uniform supply and air supply according to claim 1, characterized in that: three rows of ventilation holes (4) are evenly distributed on the furnace wall (3), and the ventilation holes (4) from top to bottom The hole diameters are 3mm, 4mm and 5mm respectively. 5. The combustion furnace with sufficient oxygen and uniform air supply according to claim 4, characterized in that the distance between each row of ventilation holes (4) is 3.5-4 cm. 6. The full-oxygen uniform air supply combustion furnace according to claim 1, characterized in that: when there is 50% of the furnace volume dry fuel in the sufficient oxygen uniform air supply combustion furnace, after the temperature is stabilized, you can add The fuel with a water content of 50%-70% can also be burned in the furnace by burning weeds or fresh leaves that have just been cut from the mountain and do not need to be dried. The temperature inside the furnace wall can reach above 1200°C.