阅读说明：本技术 一种聚丙烯酰胺干燥用分段电加热热烘炉及使用方法 (Segmented electric heating oven for drying polyacrylamide and use method ) 是由 李金江 王兵杰 荣洪杰 于 2021-08-25 设计创作，主要内容包括：本发明涉及一种聚丙烯酰胺干燥用分段电加热热烘炉及使用方法,涉及化工设备技术领域,炉座、炉体由炉底板连接,一段加热区、二段加热区和三段加热区内均设有加热管且自下而上安装在炉体内,各段加热区内的加热管分别由一段检测件、二段检测件和三段检测件联动控制；进料绞龙装置安装于炉体一侧；外置风机分离器通过法兰、垫片水平安装在炉体一侧,外置风机分离器位于进料绞龙装置下方,主搅拌风机架设在炉体外,主搅拌风机输出端转动连接有吹料扇叶,吹料扇叶在炉体内且位于外置风机分离器正下方,本发明具有分段加热,可以有效控制物料出炉前的缓苏阶段温度,使物料干燥效果更好的优点。(The invention relates to a segmented electric heating oven for drying polyacrylamide and a use method thereof, relating to the technical field of chemical equipment.A furnace base and a furnace body are connected by a furnace bottom plate, heating pipes are arranged in a first heating zone, a second heating zone and a third heating zone and are arranged in the furnace body from bottom to top, and the heating pipes in each heating zone are respectively controlled by a first detection piece, a second detection piece and a third detection piece in a linkage way; the feeding auger device is arranged on one side of the furnace body; the external fan separator is horizontally arranged on one side of the furnace body through a flange and a gasket, the external fan separator is positioned below the feeding auger device, the main stirring fan is erected outside the furnace body, the output end of the main stirring fan is rotatably connected with the material blowing fan blades, and the material blowing fan blades are arranged in the furnace body and are positioned under the external fan separator.)

1. The utility model provides a polyacrylamide is dry with segmentation electrical heating heat baker, includes furnace base (1), furnace body (2) and stove bottom plate (3), and furnace base (1), furnace body (2) are connected its characterized in that by stove bottom plate (3): the device also comprises a main stirring fan (8), a first heating zone (12), an external fan separator (13), a feeding auger device (14), a first detection piece (15), a second heating zone (16), a second detection piece (17), a third heating zone (18) and a third detection piece (19); heating pipes are arranged in the first heating zone (12), the second heating zone (16) and the third heating zone (18) and are arranged in the furnace body (2) from bottom to top, and the heating pipes in each heating zone are respectively controlled by the first detection piece (15), the second detection piece (17) and the third detection piece (19) in a linkage way; the feeding auger device (14) is arranged on one side of the furnace body (2); external fan separator (13) pass through flange, gasket horizontal installation in furnace body (2) one side, and external fan separator (13) are located feeding auger device (14) below, and main agitator fan (8) erect outside furnace body (2), and main agitator fan (8) output rotates and is connected with and blows the material flabellum, blows the material flabellum and just is located external fan separator (13) under in furnace body (2).

2. The sectional electric heating oven for drying polyacrylamide as claimed in claim 1, wherein: the outer wall of the furnace body (2) is coated with a heat-insulating layer which is an aluminum silicate soft plate; the inner wall of the furnace body (2) is sprayed with an anticorrosive heat reflection coating or adopts a high-temperature resistant anticorrosive mirror reflection material as a lining.

3. The sectional electric heating oven for drying polyacrylamide as claimed in claim 2, wherein: a left ash removal manhole (4) and a right ash removal manhole (6) are respectively arranged on two sides of the furnace base (1), the left ash removal manhole (4) and the right ash removal manhole (6) are respectively formed by covering two round manholes, and the left ash removal manhole (4) and the right ash removal manhole (6) are communicated with the inner cavity of the furnace base (1); the two sides of the lower part of the furnace bottom plate (3) are provided with a left ash hole (5) and a right ash hole (7), and the left ash hole (5) and the right ash hole (7) are communicated with the inner cavity of the furnace body (2) and the furnace base (1).

4. The sectional electric heating oven for drying polyacrylamide as claimed in claim 1, wherein: the temperature of the lower part of the furnace body (2) is controlled to be maintained between 95 ℃ and 115 ℃ by the first heating zone (12), and the temperature of the middle part of the furnace body (2) is controlled to be maintained between 75 ℃ and 100 ℃ by the second heating zone (16); the three sections of heating zones (18) control the temperature of the upper part of the furnace body (2) to be maintained between 55 ℃ and 80 ℃, and the negative pressure in the furnace body (2) is maintained between 30 pa and 60 pa.

5. The sectional electric heating oven for drying polyacrylamide as claimed in claim 4, wherein: the heating pipes in the first heating zone (12), the second heating zone (16) and the third heating zone (18) are made of alloy material heating pipes, and each heating pipe is independently and automatically controlled by a first detection piece (15), a second detection piece (17) and a third detection piece (19) through circuits, so that the temperature regulating gradient of the heating pipes in the first heating zone (12), the second heating zone (16) and the third heating zone (18) is between 3 and 6 ℃.

6. The sectional electric heating oven for drying polyacrylamide as claimed in claim 5, wherein: the heating pipe is characterized in that a stainless steel lining is arranged on the outer layer of the heating pipe, a support is arranged outside the heating pipe, the support is fixed on the inner wall of the furnace body (2), a sleeve head is welded at the lower end of the support, the bottom of the heating pipe is supported by the sleeve head, an annular insertion hole is formed in the upper end of the support, and the upper portion of the heating pipe is inserted into the ring, so that the upper end of the heating pipe is kept in a movable state.

7. The sectional electric heating oven for drying polyacrylamide as claimed in claim 6, wherein: the external fan separator (13) comprises a fan (131), an air pipe (132), a flow-around plate (133), a feeding pipe (134), an air box (135), a power-assisted feeding screw (136), a material overflow cover (138) and separating fan blades (139), wherein the fan (131) is fixed on the external frame, and the fan (131) is connected with the air pipe (132) through flexible connection; the air pipe (132) is connected with a reserved air pipe connector on the outer wall of the furnace body (2) through a flange and a gasket; the flow surrounding plate (133) is welded in front of the joint of the air box (135) and the air pipe (132), and the height of the flow surrounding plate (133) is 1/3-2/3 of the height of the air box (135); the wind box (135) is welded with the material overflow cover (138) by taking the center of the feeding pipe (134) as a circle center, and the feeding pipe (134) is communicated with the feeding auger device (14); the power-assisted feeding screw rod (136) is rotationally connected into the feeding pipe (134), and the power-assisted feeding screw rod (136) is connected with a main shaft of the separation fan blade (139); a spiral air duct is arranged in the air box (135), an air outlet (137) is arranged at the bottom of the air box (135), the angle of the air outlet (137) is set to be 30-60 degrees, and the angle of the air outlet (137) forms 90 degrees with the central plane of the separation fan blade (139).

8. The sectional electric heating oven for drying polyacrylamide as claimed in claim 7, wherein: a left air inlet duct (9) and a right air inlet duct (10) are arranged on the two sides of the furnace body (2) so as to enable filtered air to enter the furnace body (2); air inlets of the left air inlet duct (9) and the right air inlet duct (10) are both arranged at the upper part of the furnace body (2), air filtering layers are arranged at the air inlets of the left air inlet duct (9) and the right air inlet duct (10), and manual-automatic integrated regulating valves are arranged on the left air inlet duct (9) and the right air inlet duct (10).

9. The use method of the segmented electric heating oven for drying polyacrylamide as claimed in any one of claims 1-8, wherein: comprises the following steps of (a) carrying out,

i, putting the polyacrylamide powder into a feeding auger device (14), putting the powder into a feeding pipe (134) by the feeding auger device (14), and starting a fan (131) to blow air into an air pipe (132) and an air box (135);

II, air in the air box (135) is sprayed out through the air outlet (137) to push the separation fan blade (139) to rotate, at the moment, powder falls to the separation fan blade (139) through the feeding pipe (134), and under the action of wind power of the air outlet (137) and rotation of the separation fan blade (139), the powder falls in a scattered manner, so that subsequent blowing and drying are facilitated;

when the fan (131) is started, the main stirring fan (8) is also started, the powder is blown to the two-section heating area (16) and the three-section heating area (18) from the first-section heating area (12) by the material blowing fan blades, and the powder is heated and dried at the three-section heating area; the impurities with larger particles fall onto the furnace bottom plate (3) due to the gravity of the impurities larger than the buoyancy, so that the material separation is realized;

IV, the main stirring fan (8) rotates in a frequency conversion mode, so that the powder can stay for 90-120 s in the first heating area (12), stay for 50-90 s in the second heating area (16), stay for 20-50 s in the third heating area (18), and finally is pumped out of the furnace body (2) through a discharge pipe at the top of the furnace body (2); drying the powder;

and V, opening the left ash hole (5) and the right ash hole (7), so that the impurities falling to the furnace bottom plate (3) fall into the furnace base (1) through the left ash hole (5) and the right ash hole (7), and finally, clearing the impurities through the left ash removal manhole (4) or the right ash removal manhole (6).

10. The use method of the segmented electric heating oven for drying polyacrylamide as claimed in claim 9, wherein: furnace body (2) with be equipped with electrostatic precipitator (20) between the discharging pipe, open electrostatic precipitator (20) when drying work goes on, treat that the powder is whole to get into the discharging pipe after, and when not opening left ash hole (5) and right ash hole (7), close electrostatic precipitator (20) and main stirring fan (8), blow in the air to the discharging pipe is reverse simultaneously, fan (131) still start.

Technical Field

The invention relates to the technical field of chemical equipment, in particular to a segmented electric heating oven for drying polyacrylamide and a using method thereof.

Background

At present, the polyacrylamide drying mode is usually carried out by adopting a natural gas hot oven, and the drying mode is well received by manufacturers when the hot oven is pushed out, but the following problems are prominent along with the application time: the drying heat is mainly the radiant heat of a burner, the temperature graduation of the radiant heat is unbalanced, the improvement is realized by the driving of a fan, but the waste heat radiation is basically relied on in the middle of a drying furnace, the temperature of the materials in the tempering stage before discharging is not controlled, and the overall heat efficiency is difficult to improve compared with the heat value of fuel; the air inlet of the oven is mainly a fan, particularly for a horizontal oven, the air inlet is low, the ground dust is more, the air inlet quality of the oven is poor, and the product purity and the product chromaticity are influenced; when powder materials are treated by a heat oven taking combustion as a heating mode, a horizontal oven is generally adopted, and one important disadvantage of the horizontal oven is large floor space, larger equipment investment and unsuitability for the trend of high intensive development of the land of the factory; the drying of powder materials has higher requirement on the dispersion degree of the materials, the materials are generally dispersed by a cyclone separator, the cyclone separator is generally driven by a motor, the application of the motor in a high-temperature environment is limited, the materials are particularly easy to burn out, the material dispersion effect is influenced, and the operation stability of equipment faces a larger challenge; the traditional electric heating oven has the problems that the heating pipe is easy to age and the heat efficiency is low; the drying of powder product materials also has the problem to be solved urgently that the powder is easy to be hung on the wall; meanwhile, the automation degree of the equipment is low, the operation is unstable, and the product quality is influenced.

Therefore, in view of the above disadvantages, it is desirable to provide a sectional electric heating oven for drying polyacrylamide.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the technical problems that the existing polyacrylamide drying and heating oven is low in heat efficiency, low in automation operation degree, unstable in operation, easy to age due to high temperature of a cyclone separation motor and easy to hang materials on the wall.

(II) technical scheme

In order to solve the technical problem, the invention provides a segmented electric heating oven for drying polyacrylamide, which comprises an oven base, an oven body, an oven bottom plate, a main stirring fan, a first heating zone, an external fan separator, a feeding auger device, a first detection piece, a second heating zone, a second detection piece, a third heating zone and a third detection piece; the furnace base and the furnace body are connected by a furnace bottom plate, heating pipes are arranged in the first heating zone, the second heating zone and the third heating zone and are arranged in the furnace body from bottom to top, and the heating pipes in the heating zones are respectively controlled by the first detection piece, the second detection piece and the third detection piece in a linkage manner; the feeding auger device is arranged on one side of the furnace body; the external fan separator is horizontally arranged on one side of the furnace body through a flange and a gasket, the external fan separator is positioned below the feeding auger device, the main stirring fan is erected outside the furnace body, the output end of the main stirring fan is rotatably connected with the material blowing fan blade, and the material blowing fan blade is arranged in the furnace body and is positioned under the external fan separator.

As a further explanation of the invention, the outer wall of the furnace body is preferably coated with a heat-insulating layer, and the heat-insulating layer is preferably an aluminum silicate soft plate; the inner wall of the furnace body is sprayed with an anticorrosive heat reflection coating or a high-temperature-resistant anticorrosive mirror reflection material is used as a lining.

As a further explanation of the present invention, preferably, a left ash removal manhole and a right ash removal manhole are respectively arranged at two sides of the furnace base, the left ash removal manhole and the right ash removal manhole are respectively made by covering two round manholes, and the left ash removal manhole and the right ash removal manhole are communicated with the inner cavity of the furnace base; the two sides of the lower part of the furnace bottom plate are provided with a left ash hole and a right ash hole which are communicated with the inner cavity of the furnace body and the furnace base.

As a further explanation of the present invention, preferably, the temperature of the lower part of the furnace body is controlled to be maintained between 95 ℃ and 115 ℃ in the first heating zone, and the temperature of the middle part of the furnace body is controlled to be maintained between 75 ℃ and 100 ℃ in the second heating zone; the temperature of the upper part of the furnace body is controlled to be maintained between 55 ℃ and 80 ℃ by the three heating zones, and the negative pressure in the furnace body is maintained between 30 pa and 60 pa.

As a further explanation of the present invention, it is preferable that the heating pipes in the first heating zone, the second heating zone and the third heating zone are made of alloy material, and each heating pipe is independently and automatically controlled by the first detecting element, the second detecting element and the third detecting element through a circuit, so that the temperature adjusting gradient of the heating pipes in the first heating zone, the second heating zone and the third heating zone is between 3 ℃ and 6 ℃.

As a further description of the present invention, preferably, a thin stainless steel lining is disposed on an outer layer of the heating tube, a support is disposed outside the heating tube, the support is fixed on an inner wall of a furnace body, a sleeve is welded to a lower end of the support, a bottom of the heating tube is supported by the sleeve, an annular insertion hole is disposed at an upper end of the support, and an upper portion of the heating tube is inserted into the annular insertion hole, so that the upper end of the heating tube is kept in a movable state.

As a further explanation of the present invention, preferably, the external fan separator includes a fan, an air duct, a flow-around plate, a feeding pipe, an air box, a power-assisted feeding screw, a material overflow cover and a separation fan blade, the fan is fixed on the external frame, and the fan is connected with the air duct through a flexible connection; the air pipe is connected with a reserved air pipe connector on the outer wall of the furnace body through a flange and a gasket; the flow surrounding plate is welded in front of the joint of the air box and the air pipe, and the height of the flow surrounding plate is 1/3-2/3 of the height of the air box; the bellows is welded with the material overflow cover by taking the center of the feeding pipe as the circle center, and the feeding pipe is communicated with the feeding auger device; the boosting feeding screw is rotationally connected in the feeding pipe and is connected with the main shaft of the separation fan blade; the air box is internally provided with a spiral air duct, the bottom of the air box is provided with an air outlet, and the angle of the air outlet is set to be 30-60 degrees and forms 90 degrees with the central plane of the separation fan blade.

As a further explanation of the present invention, it is preferable that both sides of the furnace body are provided with a left air inlet duct and a right air inlet duct to allow filtered air to enter the furnace body; air inlets of the left air inlet duct and the right air inlet duct are both arranged at the upper part of the furnace body, air filtering layers are arranged at the air inlets of the left air inlet duct and the right air inlet duct, and manual-automatic integrated regulating valves are arranged on the left air inlet duct and the right air inlet duct.

The invention also provides a using method of the segmented electric heating oven for drying polyacrylamide, which comprises the following steps:

i, feeding polyacrylamide powder into a feeding auger device, feeding the powder into a feeding pipe by the feeding auger device, and starting a fan to blow air into an air pipe and an air box;

air in the air box is sprayed out through the air outlet to push the separation fan blades to rotate, at the moment, powder falls to the separation fan blades through the feeding pipe, and under the action of wind power of the air outlet and rotation of the separation fan blades, the powder falls in a scattered manner, so that subsequent blowing and drying are facilitated;

when the fan is started, the main stirring fan is also started simultaneously, the powder is blown to the two-section heating area and the three-section heating area from the first-section heating area by the material blowing fan blades, and the powder is heated and dried at the three-section heating area; the impurities with larger particles fall onto the bottom plate of the furnace due to the gravity of the impurities being larger than the buoyancy, so that the separation of materials is realized;

IV, the main stirring fan rotates in a frequency conversion mode, so that the powder can stay for 90-120 s in the first heating area, stay for 50-90 s in the second heating area, stay for 20-50 s in the third heating area, and finally is pumped out of the furnace body through a discharge pipe at the top of the furnace body; drying the powder;

and V, opening the left ash hole and the right ash hole to enable the impurities falling to the bottom plate of the furnace to fall into the furnace base through the left ash hole and the right ash hole, and finally, clearing the impurities through a left ash-cleaning manhole or a right ash-cleaning manhole.

As a further explanation of the present invention, it is preferable that an electrostatic precipitator is disposed between the furnace body and the discharge pipe, the electrostatic precipitator is turned on when the drying operation is performed, after all the powder material enters the discharge pipe and the left ash hole and the right ash hole are not opened, the electrostatic precipitator and the main stirring fan are turned off, and simultaneously air is blown into the discharge pipe in a reverse direction, and the fan is still turned on.

(III) advantageous effects

The technical scheme of the invention has the following advantages:

the invention directly heats through the built-in electric heating pipe, the heat radiation distance is short, and the heating efficiency is high; the temperature of the tempering stage before the material is discharged can be effectively controlled by adopting sectional heating, and the integral heating speed is high; the external fan is adopted to drive the separator to separate the materials, so that high-temperature operation of motor-driven equipment such as a motor is avoided, the material dispersion effect is ensured, and the running stability of the equipment is high; the heating pipe is made of alloy heating materials, so that the problems of easy aging and low heat efficiency of the heating pipe of the baking furnace are effectively solved; compared with the existing general fuel hot oven, the heat utilization rate can be improved by 32 percent, the electric energy consumption is reduced by about 15 percent, and the drying rate accuracy can be controlled within 1 percent.

Drawings

FIG. 1 is an assembled block diagram of the present invention;

fig. 2 is a structural view of an external fan separator of the present invention.

In the figure: 1. a furnace base; 2. a furnace body; 3. a furnace floor; 4. a left ash removal manhole; 5. a left ash hole; 6. a right ash removal manhole; 7. a right grey hole; 8. a main stirring fan; 9. a left air inlet duct; 10. a right air inlet duct; 11. a bottom inspection viewport; 12. a section of heating zone; 13. an external fan separator; 131. a fan; 132. an air duct; 133. a flow surrounding plate; 134. a feed pipe; 135. an air box; 136. a power-assisted feed screw; 137. an air outlet; 138. a material overflow cover; 139. separating the fan blades; 14. a feeding auger device; 15. a section of detection member; 16. a second heating zone; 17. a second stage of detection; 18. three sections of heating zones; 19. three sections of detecting parts; 20. an electrostatic precipitator.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

A section electric heating oven for drying polyacrylamide is combined with a figure 1 and a figure 2, and comprises an oven base 1, an oven body 2, an oven bottom plate 3, a main stirring fan 8, a first section heating zone 12, an external fan separator 13, a feeding auger device 14, a first section detection piece 15, a second section heating zone 16, a second section detection piece 17, a third section heating zone 18 and a third section detection piece 19; the furnace bottom plate 3 is a steel flat plate, the furnace base 1 and the furnace body 2 are connected by the furnace bottom plate 3, heating pipes are arranged in the first heating zone 12, the second heating zone 16 and the third heating zone 18 and are arranged in the furnace body 2 from bottom to top, and the heating pipes in each heating zone are respectively controlled by the first detecting piece 15, the second detecting piece 17 and the third detecting piece 19 in a linkage way; the feeding auger device 14 is arranged at one side of the furnace body 2; the external fan separator 13 is horizontally arranged on one side of the furnace body 2 through a flange and a gasket, the external fan separator 13 is positioned below the feeding auger device 14, the main stirring fan 8 is erected outside the furnace body 2, the output end of the main stirring fan 8 is rotatably connected with a material blowing fan blade, and the material blowing fan blade is positioned in the furnace body 2 and under the external fan separator 13.

With reference to fig. 1 and 2, the furnace base 1 is a square metal shell, a left ash removal manhole 4 and a right ash removal manhole 6 are arranged on two sides of the furnace base 1, and the left ash removal manhole 4 and the right ash removal manhole 6 are respectively made by covering two round manholes. The two sides of the lower part of the furnace bottom plate 3 are provided with a left ash hole 5 and a right ash hole 7 which are formed by covering two round manholes, and the left ash hole 5 and the right ash hole 7 are communicated with the inner cavity of the furnace body 2 and the inner cavity of the furnace base 1 and also used as maintenance manholes. Carry out passivation treatment to above four hole trompil edges, the shape in hole can be made into square or circular according to actual need, and the preferential adoption is circular, is convenient for derive furnace body 2 with impurity outside, is convenient for wash simultaneously.

Combine figure 1, fig. 2, furnace body 2 is the cylindrical metal barrel, 2 outer wall outsourcing heat preservation of furnace body, the heat preservation is made or adopts one shot forming insulation material by the concatenation of thermal-insulated board, preferred aluminium silicate soft board, it has good high temperature resistant and thermal-insulated effect, 2 main parts of furnace body adopt the multistage heating, in order to maintain gentle temperature gradient, improve drying efficiency, the heating material heat-generating body uses the alloy material heating pipe, the tungsten filament heating pipe, infrared heating pipe is main, preferred alloy material heating pipe, each heating pipe passes through the independent automatic control of circuit, each other is not influenced. Preferably, three heating zones, from bottom to top, are a first heating zone 12, a second heating zone 16, and a third heating zone 18. A first section of detection piece 15, a second section of detection piece 17 and a third section of detection piece 19 are arranged on the side wall of the furnace body 2 at intervals, and heating power supply wiring is carried out through a detection piece jack on the furnace body 2, so that linkage control is respectively carried out on the three sections of heating areas through the first section of detection piece 15, the second section of detection piece 17 and the third section of detection piece 19.

And automatically controlling the heating to start and stop according to the internal environment temperature provided by the electronic detection piece. The number and the length of each section of heating area pipe are determined according to parameters such as temperature rise amplitude, furnace body height, furnace body diameter, airspeed and the like, then the heating pipe is uniformly installed on a support in an annular mode and fixed on a furnace wall, a sleeve head is welded at the lower end of the support, an annular insertion hole is formed in the upper end of the support, a heating pipe is inserted into the ring and supported by a lower sleeve head, and therefore the upper end of the support is movable, and damage to the heating pipe caused by expansion with heat and contraction with cold is prevented. A layer of thin stainless steel lining is added on the outer layer of the heating pipe, and the lining is used for heat conduction and uniform heating to prevent dry materials from being hung on the wall.

With reference to fig. 1 and 2, after welding and mounting of the heating zones, the detection parts and the external fan separator 13, the inner wall of the furnace body 2 is sprayed with a corrosion-resistant heat-reflecting coating to reduce heat loss, or a high-temperature-resistant corrosion-resistant specular-reflecting material is used as a lining, which can achieve the same effect, and the lining can be replaced at regular time to maintain the heat-insulating effect. And the temperature gradients of the three heating zones are as follows: the temperature of one section is between 95 and 115 ℃; the second section is between 75 ℃ and 100 ℃; the temperature of the three sections is between 55 and 80 ℃. Setting temperature rise and temperature fall gradient signals according to the heating temperature rise delay allowance of each section of heating pipe, and realizing rapid temperature rise and heat preservation operation according to the number of the heating pipes corresponding to the signal start and stop, wherein the temperature regulation gradient is preferably between 3 ℃ and 6 ℃, and is preferably 5 ℃.

Referring to fig. 1 and 2, the main stirring fan 8 is installed on the furnace bottom plate 3, a sealing sleeve is adopted at the contact position of a coupling of the main stirring fan 8 and the furnace bottom plate 3, the lower part of the coupling is supported and reinforced by angle iron reinforcing bars, the motor of the main stirring fan 8 is fixed on a welded bracket angle iron by bolts, and a rubber pad is added to prevent vibration. The motor of the main stirring fan 8 adopts a variable frequency motor, the bottom detection observation hole 11 is used for controlling and adjusting the air speed in a linkage way, the temperature of the lower part of the furnace is maintained between 95 ℃ and 115 ℃ together with the left air inlet duct 9, the right air inlet duct 10 and the section of heating area 12, the negative pressure of the furnace chamber is maintained between 30 pa and 60pa, and the accumulation of powder products at the bottom of the furnace is reduced.

With reference to fig. 1 and 2, the external fan separator 13 includes a fan 131, an air duct 132, a flow-around plate 133, a feeding pipe 134, an air box 135, a power-assisted feeding screw 136, a material overflow cover 138 and separating blades 139, the fan 131 is fixed on the external frame, and the fan 131 is connected with the air duct 132 through flexible connection, so as to reduce noise and vibration; the air pipe 132 is connected with an air pipe connector reserved on the outer wall of the furnace body 2 through a flange and a gasket; the flow-around plate 133 is welded in front of the joint of the air box 135 and the air pipe 132, and the height of the flow-around plate 133 is 1/3-2/3 of the height of the air box 135, so that the air of the fan 131 is prevented from approaching the air outlet, and the air flow is prevented from deflecting. The air box 135 is welded with the material overflow cover 138 by taking the center of the feeding pipe 134 as a circle center, the outlet of the feeding pipe 134 is covered, and the gap is sealed by high-temperature resistant sealing materials to prevent air leakage. A spiral air duct or a turbine structure is arranged in the air box 135, and the spiral air duct is preferably selected; the boosting feeding screw 136 is rotatably connected in the feeding pipe 134, the boosting feeding screw 136 is connected with a main shaft of the separation fan blade 139, and the separation fan blade 139 provides power without installing a motor. The feed pipe 134 is communicated with the feed auger device 14. The air box 135 is internally provided with a spiral air duct, the bottom of the air box is provided with an air outlet 137, the angle of the air outlet 137 is set to be 30-60 degrees and forms 90 degrees with the central plane of the separated fan blade, so that the fan 131 can be used for providing power for the fan blade, the loss of wind energy is reduced, when the angle is determined, one of the two is used for obtaining a fixed value, and the other rotation angle is in accordance with the determined sum of 90 degrees. The external fan is favorable for equipment maintenance, and the number of mobile equipment in a high-temperature environment is reduced.

With reference to fig. 1 and 2, the distance between the external fan separator 13 and the main stirring fan 8 is appropriate to ensure effective separation of the materials, and the materials are moved upward under the combined action of the main stirring fan 8 and the electrostatic precipitator fan during the falling process and do not fall on the furnace floor 3. Observation is performed by a positive pressure observation mirror provided in the bottom detection observation hole 11. The observation lens cone is closed at ordinary times, the inner observation sealing cover is opened when the observation lens cone is used, and the inflation equipment inflates air to form a positive pressure channel so as to prevent the powder from blocking the lens. The feeding auger device 14 adopts a high-strength seamless pipe as a trough, bears the gravity and the running impact force of an air box 135, a power-assisted feeding screw 136 and a material overflow cover 138 of an external fan separator 13, adopts inclined installation, and because polyacrylamide is dried through a granulation process during drying, the polyacrylamide can not be caked generally, adopts inclined installation, and because the gravity action reduces the abrasion resistance of the auger, the service life of the device is prolonged.

Referring to fig. 1 and 2, the left air inlet duct 9 and the right air inlet duct 10 are symmetrically installed on the furnace body 2, and the air inlet ducts can be symmetrically added to ensure the air inlet effect. The air inlets of the left air inlet duct 9 and the right air inlet duct 10 are both arranged on the upper portion of the equipment, the air inlets are provided with air filtering layers which can be made of multilayer resin microporous filter paper, PP cotton, polyurethane or ceramic filter elements, preferably multilayer resin microporous filter paper filter elements, and the filter elements are periodically replaced to ensure the air inlet quality and improve the product quality. And manual-automatic regulating valves are respectively arranged on the left air inlet duct 9 and the right air inlet duct 10, and the opening degree of the valves can be automatically controlled according to temperature and pressure parameters provided by the bottom detection observation hole 11, so that the operation automation is realized.

The invention also provides a using method of the segmented electric heating oven for drying polyacrylamide, which comprises the following steps:

i, putting the polyacrylamide powder into the feeding auger device 14, putting the powder into the feeding pipe 134 by the feeding auger device 14, and starting the fan 131 to blow air into the air pipe 132 and the air box 135 at the moment;

II, air in the bellows 135 is ejected through the air outlet 137 to push the separation fan blades 139 to rotate, at the moment, powder falls to the separation fan blades 139 through the feeding pipe 134, and under the action of the wind power of the air outlet 137 and the rotation of the separation fan blades 139, the powder falls in a scattered manner, so that the subsequent blowing and drying are facilitated;

III, when the fan 131 is started, the main stirring fan 8 is also started at the same time, the powder is blown to the two-section heating area 16 and the three-section heating area 18 from the first-section heating area 12 by the material blowing fan blades, and the powder is heated and dried at the three-section heating area; the impurities with larger particles fall onto the furnace bottom plate 3 due to the gravity of the impurities being larger than the buoyancy, so that the material separation is realized;

IV, the main stirring fan 8 rotates in a frequency conversion mode, so that the powder can stay for 90-120 s in the first heating area 12, stay for 50-90 s in the second heating area 16 and stay for 20-50 s in the third heating area 18, and finally is pumped out of the furnace body 2 through a discharge pipe at the top of the furnace body 2; an electrostatic dust collector 20 is arranged between the furnace body 2 and the discharge pipe, the electrostatic dust collector 20 is started when the drying work is carried out, after all the powder enters the discharge pipe and the left ash hole 5 and the right ash hole 7 are not opened, the electrostatic dust collector 20 and the main stirring fan 8 are closed, air is blown into the discharge pipe reversely at the same time, and the fan 131 is still started to finish the drying of the powder;

and V, opening the left ash hole 5 and the right ash hole 7, so that the impurities falling to the furnace bottom plate 3 fall into the furnace base 1 through the left ash hole 5 and the right ash hole 7, and finally, cleaning the impurities through the left ash cleaning manhole 4 or the right ash cleaning manhole 6.

By the method, the screw conveyer and the power-assisted feeding screw in the feeding auger device 14 can convey the powder to the position of the separation fan blade 139 in a forced manner, so that backflow under the blowing of the blowing fan blade is avoided, and the temperature of the tempering stage before the material is discharged can be effectively controlled by adopting segmented stagnation type heating, so that the overall heating speed is high; the external fan is adopted to drive the separator to separate the materials, so that high-temperature operation of motor-driven equipment such as a motor is avoided, the material dispersion effect is ensured, and the running stability of the equipment is high; the heating pipe is made of alloy heating materials, so that the problems of easy aging and low heat efficiency of the heating pipe of the baking furnace are effectively solved; adopt smooth removable inside lining, effectively solve the powder material wall built-up problem. The air inlet duct of the oven is provided with a filtering device, so that the air inlet cleanliness is kept, and the product purity and the product chromaticity are favorably improved; and the vertical design is adopted, so that the arrangement investment is reduced, and the occupied area is reduced. And an automatic temperature control device is adopted, so that the drying precision is improved. Compared with the existing general fuel hot oven, the heat utilization rate can be improved by 32 percent, the electric energy consumption is reduced by about 15 percent, and the drying rate accuracy can be controlled within 1 percent.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.