CN205066394U - Interior STREAMING oven - Google Patents

Abstract

An inflow oven. The utility model relates to a roasting heat supply furnace suitable for roasting fruits and vegetables, Chinese medicinal materials and tobacco leaves in dense barns, and belongs to the technical field of roasting and drying facilities. An outer cylinder is arranged outside the furnace cylinder of the furnace body. The interlayer between the furnace cylinder and the outer cylinder is provided with a partition to separate the hot air chamber and the cold air chamber. The hot air outlet at the lower part of the hot air chamber is equipped with a circulating fan. The cold air chamber is connected, the upper inlet of the cold air chamber is open to the atmosphere, the smoke outlet of the furnace tube is set on the top above the hot air chamber and leads to the atmosphere through the blower and the chimney pipe, and the combustion chamber on the furnace and the ash cleaning chamber are indirectly connected to the air distribution channel. The utility model is simple and compact, has low manufacturing cost, is not easy to block the heat exchange pipe, can maximize the heat exchange area in a limited space, can save more than 20% of fuel, and can reduce the emission of air pollutants by more than 30%.

Description

An internal flow oven

technical field

The utility model relates to a roasting heat supply furnace suitable for roasting fruits and vegetables, Chinese medicinal materials and tobacco leaves in dense barns, belonging to the technical field of roasting and drying facilities.

Background technique

The currently widely used agricultural and by-product ovens are all external heat exchange methods, that is, the lower part is a combustion furnace body, and the upper part is a heat exchange device composed of heat exchange tubes. The ovens with this structure all have the problems of complex manufacture, low heat transfer efficiency, and slow temperature rise rate. The energy-saving hot blast stove in patent 01228210.3 has this problem. The heat exchange structure is complicated to manufacture, the manufacturing cost is expensive, the hot air stroke is too long, and the power of the circulating fan is relatively large. In the actual working process, the impurities carried by the high-temperature flue gas are difficult Clean up, so it is easy to block the heat exchange pipe.

Contents of the invention

The purpose of the utility model is to provide an internal flow oven. Compared with the traditional oven, the oven has a simple structure, is not easy to block the heat exchange pipe, can save more than 20% of fuel, and can reduce the emission of air pollutants by 30%. above.

The technical solution adopted to realize the above-mentioned purpose of the utility model is: an outer cylinder is arranged outside the furnace cylinder, and the interlayer between the furnace cylinder and the outer cylinder is provided with a partition to separate the hot air chamber and the cold air chamber, and the hot air outlet at the lower part of the hot air chamber is provided with a circulating fan. The upper part of the hot air chamber is connected with the cold air chamber by a heat exchange tube, and the upper inlet of the cold air chamber is connected to the atmosphere. The dust-cleaning room is indirectly ventilated.

The air distribution channel is more than two secondary air distribution pipes, and the secondary air distribution pipes are arranged at an even interval outside the outer circumference of the refractory brick section of the furnace.

The blower is arranged at the junction position between the smoke outlet of the furnace drum and the chimney pipe, and the outlet of the blower is in the same direction as the outlet of the chimney pipe; the hot air outlet is arranged at the lower part of the hot air chamber facing the ash cleaning chamber.

The furnace cylinder of the furnace body coincides with the center line of the outer cylinder.

This oven adopts a simple structure of vertical two-layer jacket internal flow heat exchange method, and the combustion furnace and heat pipe are combined to maximize the heat exchange area in a limited space, thereby increasing the heating rate and reducing manufacturing costs.

The semi-gasification combustion is carried out with the secondary air distribution while using the negative pressure blast, and the combustion is sufficient, which significantly improves the heat exchange efficiency between the high-temperature flue gas and the heat pipe. The natural air entering from the outside enters the hot air jacketed cold air chamber to scour the furnace cylinder for primary preheating, then flows out through the built-in heat exchange tube, and then enters the hot air jacketed hot air chamber for secondary heating to achieve rapid temperature rise. At the same time, the combustion furnace of this internal flow oven is set at the core inner layer of the furnace body, the upper part is equipped with heat exchange tubes, and the outside is surrounded by natural air, so that the air heat exchange is timely and efficient.

Due to the sufficient heat exchange, the circumference of the furnace cylinder and the heat pipe are washed by good natural air, which effectively improves the service life of the furnace cylinder and reduces the maintenance cost in the process, thereby achieving high efficiency, energy saving, environmental protection, and minimizing Manufacturing cost and manufacturing difficulty.

The beneficial technical effects of the utility model are: adopting the tangentially induced air blower to generate negative pressure, so that the flue gas flow direction is stable, thereby improving its working environment and increasing the service life of the fan. The semi-gasification secondary combustion method is adopted to effectively avoid the generation of tar, thereby preventing the smoke outlet from being blocked during the smoke transmission process. The heat exchange jacket improves the heat exchange efficiency of natural air, forcibly controls the air flow direction, and increases the heating rate of hot air. In order to effectively improve the fuel utilization rate and improve the environmental protection performance of the exhaust gas, a combustion chamber space and a built-in heat exchange tube are arranged on the upper part of the furnace cylinder. Thorough combustion to achieve the purpose of clean emissions. In order to prevent the grate from being in a high temperature environment for a long time, the top side smoke discharge method is adopted. Because the flue gas does not pass through the grate, but is drawn from the side of the furnace wall above the grate, refractory bricks are installed inside the furnace tube to ensure that the furnace tube and Grate service life.

Description of drawings

Fig. 1 is a front structural schematic diagram of the utility model.

Fig. 2 is a left view structure diagram of the utility model.

Fig. 3 is a top view structural diagram of the utility model.

The symbols in the figure represent in turn: outer cylinder 1, furnace cylinder 2, hot air chamber 3, cold air chamber 4, heat exchange tube 5, partition plate 6, refractory brick 7, coal inlet 8, grate 9, ash cleaning chamber 10, Ash cleaning port 11, combustion chamber 12, chimney pipe 13, smoke outlet 14, air distribution channel 15, secondary air distribution pipe 16, hot air outlet 17, air inlet 19, blower 20, circulation fan 21, furnace body 22.

detailed description

See individual figures. This device is mainly made up of body of heater 22, chimney pipe 13, blower machine 19 and circulation blower 20 four parts. The outer cylinder 1 of the furnace body 22 surrounds the furnace cylinder 2 , and the hot air partition 6 forms a separated hot air chamber 3 and a cold air chamber 4 between the outer cylinder 1 and the furnace cylinder 2 . The space surrounded by the soot removal port 11 at the lower part of the furnace body, the fire grate 9 and the furnace body 22 forms the soot removal chamber 10 . Coal feeding port 8 located in the middle of the furnace body, refractory brick 7 and furnace body 22 form the coal burning section of combustion chamber 12 . The cold air chamber 4 communicates with the hot air chamber 3 through the heat exchange tube 5 at the upper part of the interlayer. A secondary air distribution pipe 16 is arranged on the outer periphery of the refractory brick 7 in the middle and lower part of the furnace body to connect the cleaning chamber 10 with the combustion chamber 12 . A smoke outlet 14 is arranged on the upper part of the furnace tube 2, and the smoke is discharged to the atmosphere through the chimney pipe 13 and the blower 20. The external natural air enters the cold air chamber 4 from the air inlet 19 by the negative pressure of the circulating fan 21, flows to the hot air chamber 3 through the heat exchange pipe 5, and finally sends out the subsequent oven through the hot air outlet 17 and the circulating fan 21 for drying.

The utility model working process is like this:

Under the action of the blower 20, a negative pressure is generated in the combustion chamber 12, and the external air enters the ash removal chamber 10 through the soot removal port 11, and the air passes through the grate 9 and burns with the coal added from the coal inlet 8. At the same time, part of the air Enter the space above the refractory brick 7 of the combustion chamber 12 through the entrance of the secondary air distribution pipe 16 located in the cleaning chamber 10, and mix with the remaining combustible gas to form secondary combustion. The smoke outlet 14 flows through the smoke outlet 14 and the chimney pipe 13 to the atmosphere. During the entire flue gas circulation process, the furnace cylinder 2 and the heat exchange tube 5 in the middle are heated.

Under the negative pressure of the circulating fan 21, the external natural air enters the cold air chamber 4 from the air inlet 19 by the negative pressure of the circulating fan 21, flows to the hot air chamber 3 through the heat exchange tube 5, and finally sends out the subsequent hot air through the hot air outlet 17 and the circulating fan 21. Oven to dry.

Claims (4)

1. An internal flow oven, characterized in that: an outer cylinder is arranged outside the furnace cylinder, and the interlayer between the furnace cylinder and the outer cylinder is provided with a partition to separate the hot air chamber and the cold air chamber, and the hot air outlet at the bottom of the hot air chamber is provided with a circulation Fan, the upper part of the hot air chamber is connected to the cold air chamber with a heat exchange tube, the upper inlet of the cold air chamber is ventilated to the atmosphere, the smoke outlet of the furnace tube is set on the top above the hot air chamber and leads to the atmosphere through the blower and the chimney pipe, the combustion chamber on the furnace Indirect ventilation channel with the cleaning room. 2. The internal flow oven according to claim 1, characterized in that: the air distribution channel is more than two secondary air distribution pipes, and the secondary air distribution pipes are arranged on the outer circumference of the refractory brick section of the furnace at even intervals. outside. 3. The internal flow oven according to claim 2, characterized in that: the blower is set at the junction of the smoke outlet of the furnace cylinder and the chimney pipe, and the blower outlet is in the same direction as the chimney pipe outlet; the hot air outlet is set in the hot air chamber The lower part is facing the position of the cleaning room. 4. The internal flow oven according to claim 3, characterized in that: the center line of the furnace tube coincides with the center line of the outer tube.