CN211823747U

CN211823747U - Hot air generating and conveying device of high-temperature large-air-volume grain drying tower

Info

Publication number: CN211823747U
Application number: CN202020099139.7U
Authority: CN
Inventors: 李景伟; 茆添翔
Original assignee: Mudanjiang Blue Environmental Protection Technology Co ltd
Current assignee: Mudanjiang Blue Environmental Protection Technology Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-10-30
Anticipated expiration: 2030-01-17

Abstract

The utility model provides a high hot-blast formation of high temperature big amount of wind grain drying tower and conveyor, includes shell and thermal-insulated heat preservation, and shell internal partitioning is 5 regions such as air heat exchange area, flame holding, first flue gas gyration, second flue gas gyration and fume emission, and the inside flue gas circulation pipeline that is provided with in air heat exchange area, flame holding is regional outwards seted up the flame introducing port, and fume emission has seted up the exhanst gas outlet in the area. The utility model discloses a flue gas circulation pipeline and lay structural design thereof, the effective length of flue gas circulation pipeline has been increased, increased and contact the effective heat transfer area between the air, in practical application, can promote flue gas velocity of flow, shorten the residence time of burning flame in flame holding region, control flame holding district temperature rise, reach the purpose that continuously keeps high flame burning intensity, also can promote heated air velocity of flow simultaneously, improve dry hot-blast formation temperature and dry hot-blast transport capacity, satisfy the supporting requirement of great scale drying tower.

Description

Hot air generating and conveying device of high-temperature large-air-volume grain drying tower

Technical Field

The utility model relates to a hot-blast formation of grain drying tower and conveyor, in particular to hot-blast formation of high temperature big amount of wind grain drying tower and conveyor.

Background

The grain drying tower is a building facility for drying grain flow in the tower by utilizing flowing hot air to reduce the water content of grain, and the working principle is that the drying hot air conveyed into the grain drying tower by a plurality of drying hot air conveying pipelines at different levels forms a temperature gradient in the grain drying tower to dry the grain flow moving downwards in the grain drying tower. At present, limited by national energy and environmental protection policies, energy-saving and environment-friendly facilities are generally popularized and used in the link of generating dry hot air, the utility model patent with patent number 2019204682328 and name of 'a hot air generating and conveying device for grain drying tower' discloses a hot air generating and conveying device which uses clean energy, has sufficient heat exchange and can solve the problem of energy waste caused by long-distance hot air conveying, has the advantages of saving natural resources and reducing environmental pollution, however, the device also has the problem of lower rated heating combustion intensity under the existing design structure state, the generation reasons are that on one hand, the efficiency of heat exchange between a heating pipeline and air is not high, the high temperature discharge of combustion smoke causes great waste of energy, on the other hand, the service life is obviously shortened due to insufficient temperature regulation capacity of a flame holding cavity, and local ablation damage is caused, the defects of low temperature of the drying hot air and insufficient conveying capacity of the drying hot air are particularly shown in practical application, such as: the embodiment of the utility model provides an use the environmental protection fuel to adopt the highest combustion strength of 60 kilograms/hour as the raw materials, the hot-blast actual temperature of formation drying under this intensity can only reach 60 ~ 120 ℃, this temperature only is suitable for grain crops to the low moisture content such as rice to carry out drying process, can't satisfy the technological requirement that high moisture content grain crops such as maize are up to 120 ~ 160 ℃ drying temperature, and dry hot-blast conveying capacity can only reach 2 ten thousand cubic meters/hour at most, can only support the grain drying tower of 250 tons of daily throughput maximally, can't satisfy the requirement of the higher daily throughput of grain drying tower, the range of application and popularization has received very big restriction. Therefore, it is necessary to improve the structure of the hot air generating and conveying device of the grain drying tower, improve the temperature of generated hot air and the conveying capacity of the hot air, and expand the application and popularization range.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a problem to prior art exists provides a hot-blast formation of high temperature big amount of wind grain drying tower and conveyor, improves and generates dry hot air temperature and dry hot air conveying ability.

A high-temperature large-air-volume grain drying tower high-hot air generating and conveying device comprises: the device comprises a shell 10 and a heat insulation layer 11 arranged outside the shell 10, wherein the inside of the shell 10 is divided into an air heat exchange area 1, a flame accommodating area 2, a first flue gas turning area 3, a second flue gas turning area 4 and a flue gas discharging area 5.

Wherein: the air heat exchange area 1 is separated from the flame accommodating area 2, the first flue gas turning area 3, the second flue gas turning area 4 and the flue gas discharge area 5, a flue gas circulation pipeline 6 is arranged in the air heat exchange area and used for exchanging heat with flowing air, the flue gas circulation pipeline 6 is divided according to the set area and respectively forms a first pipeline group 61, a second pipeline group 62 and a third pipeline group 63, the first pipeline group 61 is used for communicating the flame accommodating area 2 with the first flue gas turning area 3, the second pipeline group 62 is used for communicating the first flue gas turning area 3 with the second flue gas turning area 4, the third pipeline group is used for communicating the second flue gas turning area 4 with the flue gas discharge area 5, preferably, the number of the flue gas circulation pipelines 6 forming the first pipeline group 61 is larger than the number of the second pipeline group 62, the number of the second duct groups 62 is greater than the number of the third duct groups 63, and more preferably, the aperture of the flue gas flowing duct 6 forming the first duct group 61 is greater than or equal to the aperture of the second duct group 62, the aperture of the second duct group 62 is greater than the aperture of the third duct group 63, one end of the air heat exchange region 1 is an open port, and the other end opposite to the open port is provided with a hot air outlet 8, so that a cold air is formed in the air heat exchange region 1 and sucked by the open port, and after penetrating through the longitudinal direction of the air heat exchange region 1, an air flowing channel led out from the hot air outlet 8 realizes heat exchange with the flue gas flowing duct 6; the flame accommodating area 2 is arranged at the lower part of the air heat exchange area 1, and is communicated with the first flue gas turning area 3 arranged at the upper part of the air heat exchange area 1 through the first pipeline group 61, the first flue gas turning area 3 is also communicated with the second flue gas turning area 4 arranged at the lower part of the air heat exchange area 1 through the second pipeline group 62, meanwhile, the second flue gas turning area 4 is further communicated with the flue gas discharge area 5 through the third pipeline group 63, a flame lead-in opening 9 is arranged outside the flame accommodating area 2 and is used for being connected with an external burner 30 to lead combustion flame into the flame accommodating area 2, a flue gas discharge opening 14 is arranged in the flue gas discharge area 5 to form combustion flue gas flow in the flame accommodating area 2 which flows through the first flue gas turning area 3, The second flue gas turning zone 4 and the flue gas discharge zone 5, and finally the flue gas flow path discharged from the flue gas discharge opening 14.

The high-temperature large-air-volume grain drying tower high-hot air generating and conveying device further comprises:

preferably, the flue gas circulation pipes 6 are arranged in the air heat exchange area 1 in layers along the longitudinal section, the distance W between the flue gas circulation pipes 6 on each arrangement layer surface is smaller than the outer diameter D of the flue gas circulation pipes 6, further preferably, the distance W between the flue gas circulation pipes 6 is 96% -98% of the outer diameter D of the flue gas circulation pipes 6, two adjacent arrangement layers are arranged in a staggered mode, the flue gas circulation pipes 6 on one arrangement layer are shielded at the gap between the two flue gas circulation pipes 6 on the adjacent arrangement layer, heating air in the air heat exchange area 1 is caused to flow in a continuous S-shaped track, the heat exchange contact area between the flowing air and each flue gas circulation pipe 6 is increased, and the heat exchange efficiency is improved;

preferably, a heat-resistant protective layer 12 is arranged on a connection surface between the top of the flame accommodation area 2 and the first pipe group 61, so as to protect the connection surface from ablation damage possibly caused by flame gathering and overheating;

preferably, a plurality of airflow holes 13 are formed outward around the flame introducing port 9 formed in the flame accommodating area 2, and the temperature distribution in the flame accommodating area 2 is controlled in a balanced manner by using the negative pressure introduction of the room temperature air, so that the average temperature and the maximum temperature are adjusted and reduced.

The utility model has the advantages that: through flue gas circulation pipeline and lay structural design, the effective length of flue gas circulation pipeline has been increased, increased and contact the effective heat transfer area between the air, in practical application, on the one hand because heat exchange is abundant, can realize the promotion of flue gas velocity of flow, shorten the residence time of burning flame in flame holding area, the temperature rise in control flame holding district, reach the purpose that continuously keeps high flame burning intensity operation, on the other hand is owing to flow the improvement of heat exchange efficiency between air and flue gas circulation pipeline in the heat exchange area, realize the promotion of heated air velocity of flow, when improving the hot air temperature that generates, also can improve the hot-blast transport capacity of drying, both can enlarge the utility model discloses the application of device, also can satisfy the supporting operation requirement of great day throughput grain drying tower simultaneously.

Drawings

FIG. 1 is a main sectional view of a high-temperature large-air-volume grain drying tower high-hot air generating and conveying device.

Fig. 2 is a partial sectional view of a high hot air output end of a high-temperature large-air-volume grain drying tower high-hot air generating and conveying device.

Fig. 3 and 2 are sectional views of the end face a-a.

Fig. 4 and a partial enlarged view of the region B in fig. 3.

Fig. 5 is a partial cross-sectional view of a cold air feeding end of a high-temperature large-air-volume grain drying tower high-hot air generating and conveying device.

FIG. 6 is a side view of a high-temperature large-air-volume grain drying tower high-hot air generating and conveying device

Detailed Description

The technical solution claimed by the present invention is further described below with reference to the following embodiments and accompanying fig. 1 to 6.

A hot air generating and conveying device of a high-temperature large-air-volume grain drying tower is shown in figure 1 and comprises: the device comprises a shell 10 and a heat insulation layer 11, wherein the inside of the shell 10 is divided into an air heat exchange area 1, a flame accommodating area 2, a first flue gas turning area 3, a second flue gas turning area 4 and a flue gas discharge area 5; flue gas circulation pipes 6 are arranged in the air heat exchange area 1 and the flame accommodation area 2, as shown in fig. 2, 3, 4 and 5, the outer diameter of the flue gas circulation pipes 6 forming the first pipe group 61 and the second pipe group 62 is 44 mm, the distance between the flue gas circulation pipes 6 on each arrangement layer is 40 mm, the outer diameter of the flue gas circulation pipes 6 forming the third pipe group 63 is 26 mm, the distance between the flue gas circulation pipes 6 on each arrangement layer is 25 mm, each arrangement layer is arranged in the air heat exchange area 1 in layers along the longitudinal section, two adjacent arrangement layers are alternately staggered, so that the flue gas circulation pipes 6 on one arrangement layer are shielded at the gap between the two flue gas circulation pipes 6 on the adjacent arrangement layer, as shown in fig. 4, the heated air in the air heat exchange area 1 is promoted to flow in a continuous S-shaped track, the flue gas circulation pipelines 6 are divided according to the setting area and respectively form a first pipeline group 61, a second pipeline group 62 and a third pipeline group 63, wherein: the first pipe group 61 is composed of 41 layout layers of the flue gas circulation pipes 6, the second pipe group 62 is composed of 19 layout layers, the third pipe group 63 is composed of 17 layout layers, one end of the air heat exchange area 1 is an open port, the other end opposite to the open port is provided with a hot air outlet 8, and the diameter of the hot air outlet 8 is 1000 mm; the flame accommodating area 2 is externally provided with flame inlets 9, as shown in fig. 6, airflow holes 13 are further externally provided around the

flame inlets

9, 6 airflow holes 13 are uniformly distributed and provided along the peripheral circumference of the flame inlets 9, a heat-resistant protective layer 12 is provided on the communication connection surface between the top of the flame accommodating area 2 and the flue gas circulation pipe 6, and the heat-resistant protective layer 12 is coated by an adhesive heat-resistant material; a flue gas discharge port 14 is opened in the flue gas discharge area 5.

Use a hot-blast formation of high temperature large amount of wind grain drying tower and conveyor carry out grain drying process, will hot-air outlet 8 is connected to the hot-blast pipeline's of grain drying tower input port to install the draught fan that power is 45 kilowatts install the exhaust fan that power is 3 kilowatts on the fume outlet 14 install the outside combustor on the flame introducing port 9, the outside combustor uses the environment-friendly fuel as the raw materials, and combustion strength is 60 ~ 100 kilograms/hour, and combustion temperature is 800 degrees.

During drying, after the induced draft fan installed on the hot air outlet 8 and the exhaust fan installed on the fume discharge port 14 are started, the external burner on the flame introducing port 9 is ignited, generated flame is sprayed into the flame accommodating area 2 and is sucked by the operation of the exhaust fan on the fume discharge port 14, the flame generated by the external burner is deflected to the top in the flame accommodating area 2, so that a local high-temperature area is formed on the connection surface between the top of the flame accommodating area 2 and the first pipeline set 61, and is protected by the heat-resistant protective layer 12, so that the connection surface is not damaged by ablation, and external air is continuously introduced from the airflow hole 13 during combustion, and the introduction of the external air can not only assist combustion of fuel oil, the energy-saving and environment-friendly effects are achieved, meanwhile, the air convection in the flame accommodating area 2 can be promoted, the space temperature distribution in the flame accommodating area 2 can be adjusted in a balanced manner, the average temperature and the highest temperature are reduced, and the external burner can continuously keep higher combustion strength; meanwhile, by adopting a structure that the hot air outlet 8 and the open port are arranged in a straight line opposite manner, the air circulation resistance can be reduced, the flow speed can be increased, the heated air in the air heat exchange area 1 can be kept to flow in a continuous S-shaped track, the heat exchange contact area between the heated air and the flue gas circulation pipeline 6 can be increased, and the heat exchange efficiency between the flowing air and the flue gas circulation pipeline 6 can be further improved; and finally, conveying the dry hot air into a conveying pipeline of a grain drying tower under the action of the induced draft fan, and drying the grain flow in the grain drying tower.

The output temperature of the high-temperature large-air-volume grain drying tower high-hot air generating and conveying device can reach 160 ℃ at most, the high-temperature large-air-volume grain drying tower high-hot air generating and conveying device is used for drying treatment of various grain crops, the air output volume can reach 5 ten thousand cubic meters at most, the high-temperature large-air-volume grain drying tower high-hot air generating and conveying device can be matched with a grain drying tower with a daily treatment capacity of 500 tons, and the technical requirements of a grain.

Claims

1. A hot-blast generation of high temperature big amount of wind grain drying tower and conveyor includes: the device comprises a shell (10) and a heat insulation layer (11) arranged outside the shell (10), and is characterized in that the inside of the shell (10) is divided into an air heat exchange area (1), a flame accommodating area (2), a first flue gas turning area (3), a second flue gas turning area (4) and a flue gas discharge area (5);

wherein: the air heat exchange area (1) is separated from the flame accommodating area (2), the first flue gas turning area (3), the second flue gas turning area (4) and the flue gas discharge area (5) respectively, a flue gas circulation pipeline (6) is arranged inside the air heat exchange area, the flue gas circulation pipeline (6) is divided according to the set areas to form a first pipeline group (61), a second pipeline group (62) and a third pipeline group (63) respectively, the first pipeline group (61) is used for communicating the flame accommodating area (2) with the first flue gas turning area (3), the second pipeline group (62) is used for communicating the first flue gas turning area (3) with the second flue gas turning area (4), and the third pipeline group is used for communicating the second flue gas turning area (4) with the flue gas discharge area (5), one end of the air heat exchange area (1) is an open port, and the other end opposite to the open port is provided with a hot air outlet (8); the flame accommodating area (2) is arranged at the lower part of the air heat exchange area (1), the flame accommodating area (2) is externally provided with a flame introducing port (9), and the smoke discharge area (5) is provided with a smoke discharge port (14).

2. The hot air generating and conveying device of the high-temperature large-air-volume grain drying tower as claimed in claim 1, wherein: the flue gas circulation pipelines (6) are arranged in the air heat exchange area (1) in a layered mode along a longitudinal section, the distance W between the flue gas circulation pipelines (6) on each arrangement layer surface is smaller than the diameter D of the flue gas circulation pipelines (6), two adjacent arrangement layers are arranged in a staggered mode, and the flue gas circulation pipelines (6) on one arrangement layer are enabled to be shielded at the gap between the two flue gas circulation pipelines (6) on the adjacent arrangement layer.

3. The hot air generating and conveying device of the high-temperature large-air-volume grain drying tower as claimed in claim 2, wherein: the distance W between the flue gas circulation pipelines (6) is 96-98% of the outer diameter D of the flue gas circulation pipelines (6).

4. The hot air generating and conveying device of the high-temperature large-air-volume grain drying tower as claimed in claim 2, wherein: and a heat-resistant protective layer (12) is arranged on the communicated connecting surface of the top of the flame accommodating area (2) and the first pipeline group (61).

5. The hot air generating and conveying device of the high-temperature large-air-volume grain drying tower as claimed in claim 4, wherein: airflow holes (13) are arranged outside the periphery of the flame introducing port (9) arranged on the flame accommodating area (2).

6. The hot air generating and conveying device of the high-temperature large-air-volume grain drying tower as claimed in any one of claims 1 to 5, wherein: the number of flue gas circulation ducts (6) making up the first duct group (61) is greater than the number making up the second duct group (62), the number making up the second duct group (62) is greater than the number making up the third duct group (63).

7. The hot air generating and conveying device of the high-temperature large-air-volume grain drying tower as claimed in claim 6, wherein: the aperture of the flue gas circulation ducts (6) forming the first duct group (61) is greater than or equal to the aperture of the second duct group (62), the aperture of the second duct group (62) being greater than the aperture of the third duct group (63).