Drying device in compound fertilizer drum granulation system

Abstract

The utility model belongs to a drying device in a compound fertilizer drum granulation system. Comprising a drying machine used for drying compound fertilizer, the front end of the drying machine is connected with a hot air distribution unit, the tail end of the drying machine is provided with a tail gas treatment unit, a fresh air preheating unit is arranged between the front end of the drying machine and the hot air distribution unit, and the hot air distribution unit is connected with the front end of the drying machine through a first tee joint and a mixed air pipe. The fresh air preheating unit comprises a combined heat exchanger which is at least connected with the tail gas treatment unit, and an outlet of the combined heat exchanger is connected with the third end of the first tee joint; the device has the advantages of being simple in structure, reasonable in design, capable of turning waste into wealth, saving energy and reducing cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to compound fertilizer production technical field especially relates to a drying device in compound fertilizer rotary drum granulation system. BACKGROUND

[0002] The production procedure of compound fertilizer rotary drum granulation process mainly includes: solid raw material treatment machine delivery, liquid phase solid phase pelletization, drying, cooling, screening, coating, packaging, wherein, the drying procedure needs to provide a large amount of hot air to exchange heat with product granules, and the moisture in the product is evaporated out, currently, the mainstream of heat source adopts the form of hot blast stove, mainly burning natural gas, biomass, etc., taking 20 million tons of rotary drum line as an example, the annual cost of burning biomass is about 4 million yuan, resulting in high production cost of product.

[0003] In the drying stage, due to the different formula of rotary drum line, the moisture and temperature of the material in the dryer are also different, therefore, the air valve is arranged at the hot blast stove to adjust the temperature of the hot air sent out by the hot blast stove by ambient cold air, generally, the temperature of the hot air entering the dryer is about 120-140 DEG C, and the air volume is 70000 m3 / h, and in the drying process, the hot air still has nearly 80-90 DEG C after heat exchange with product granules, currently, the hot air is directly discharged after passing through the cyclone dust collector, gravity settling chamber and bag-type dust collector, resulting in a large amount of heat waste.

[0004] Therefore, how to utilize the hot air at the outlet of the dryer and reduce the use of biomass fuel becomes a technical problem to be solved. UTILITY MODEL CONTENTS

[0005] The utility model provides a drying device in compound fertilizer rotary drum granulation system for solving the technical problems in the background art.

[0006] The technical scheme of the utility model is:

[0007] A drying device in compound fertilizer rotary drum granulation system, the drying device includes a dryer for drying compound fertilizer, the front end of the dryer is connected with a hot air distribution unit, the tail gas treatment unit is arranged at the tail end of the dryer, the fresh air preheating unit is arranged between the front end of the dryer and the hot air distribution unit, the hot air distribution unit is connected with the front end of the dryer through the first three-way joint and the mixed air pipe, the fresh air preheating unit includes a combined heat exchanger, the combined heat exchanger is connected with the tail gas treatment unit, and the outlet of the combined heat exchanger is connected with the third end of the first three-way joint.

[0008] The utility model discloses beneficial effect is: the utility model discloses mainly be applied to the drying device in compound fertilizer rotary drum granulation system, utilize the tail gas preheating of drying -machine to carry out the preheating of the environmental fresh air in combination heat exchanger to mix preheated fresh air with hot air distribution unit, to realize the stable temperature of hot air, the characteristics of uniform drying of fertilizer, further, above-mentioned setting can reach the purpose of reducing the heat load in hot air distribution unit, thereby reducing the biomass fuel use amount.

[0009] Preferably, the tail gas treatment unit comprises a gas phase outlet at the end of the dryer connected to a cyclone separator, the cyclone separator is connected to a first bag filter through a second three-way valve and a gravity settling chamber, and the outlet of the first bag filter is connected to an external exhaust pipeline through a tail gas fan.

[0010] Preferably, the third end of the second three-way valve is connected to the first tube pass of the combination heat exchanger through a second bag filter, and the outlet of the first tube pass of the combination heat exchanger is connected to a tail gas fan.

[0011] The combination heat exchanger comprises a shell, an environmental fresh air inlet is formed on one side of the shell, and a preheated fresh air outlet is arranged on the other side of the shell; a gas-gas heat exchange part is arranged in the shell near the environmental fresh air inlet, and a gas-liquid heat exchange part is arranged in the shell on the other side of the preheated fresh air outlet; the gas-gas heat exchange part is the first tube pass of the combination heat exchanger.

[0012] Preferably, the gas-liquid heat exchange part is the second tube pass of the combination heat exchanger, the inlet of the second tube pass of the combination heat exchanger is connected to a steam condensate pipeline, and the outlet of the second tube pass of the combination heat exchanger is connected to a desalted water pipeline.

[0013] Preferably, the first tube pass of the combination heat exchanger is of a plate heat exchanger structure, and is made of aluminum alloy; the second tube pass of the combination heat exchanger is of a tube-fin structure, the tube material is stainless steel, and the fin structure is made of aluminum.

[0014] Preferably, the inlet of the first tube pass of the combination heat exchanger is arranged on the upper part of the shell, and the outlet of the first tube pass of the combination heat exchanger is arranged on the lower part of the shell; the inlet of the second tube pass of the combination heat exchanger is arranged on the lower part of the shell, and the outlet of the second tube pass of the combination heat exchanger is arranged on the upper part of the shell.

[0015] Preferably, the hot air distribution unit comprises a blower connected to the inlet of a hot air furnace, the outlet of the hot air furnace is connected to the first three-way valve through a third three-way valve, and the third end of the third three-way valve is provided with a distribution pipeline.

[0016] Preferably, a first electric air valve and a humidity sensor are arranged on the distribution pipeline; a hot air fan and a temperature sensor are arranged between the mixing air pipe and the front end of the dryer; and a moisture detector is arranged on the dryer.

[0017] Preferably, the third end of the second tee and the second bag-type dust collector are provided with a second electric air valve, and the second tee and the gravity settling chamber are provided with a third electric air valve.

[0018] The drying device of the compound fertilizer rotary drum granulation system is characterized in that the new air preheating unit is arranged to preheat the environmental new air by preheating, so that the fuel consumption of the hot blast furnace is reduced, and the preheating mainly uses the heat source in the tail gas of the dryer to effectively utilize the waste gas heat energy. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a structural schematic view of the utility model.

[0020] Fig. 2 It is a structural schematic view of the combined heat exchanger.

[0021] In the drawing, 1 is a blower, 2 is a hot blast furnace, 3 is a wind distribution pipeline, 4 is a first electric air valve, 5 is a temperature sensor, 6 is a humidity sensor, 7 is a hot air machine, 8 is a dryer, 9 is a cyclone separator, 10 is a second electric air valve, 11 is a third electric air valve, 12 is a gravity settling chamber, 13 is a first bag-type dust collector, 14 is a tail gas fan, 15 is a second bag-type dust collector, 16 is a combined heat exchanger, 17 is a mixing pipeline, 18 is a water content detector, 19 is a first tee, 20 is a second tee, 21 is a third tee, 22 is a first tube pass, 23 is a second tube pass, 24 is an environmental new air inlet, 25 is a preheated new air outlet, 26 is a steam condensate pipeline, and 27 is a desalted water pipeline. DETAILED DESCRIPTION

[0022] In order to make the skilled in the art better understand the technical scheme of the utility model, the utility model is described in detail below in combination with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the utility model.

[0023] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0024] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the utility model is used, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0025] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0026] In the description of the utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "installed", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0027] For example, Figs. 1-2The utility model discloses a kind of drying device in composite fertilizer rotary drum granulation system, the drying device includes the drying machine 8 for drying composite fertilizer, the front end of the drying machine 8 is connected with hot air distribution unit, the tail gas treatment unit is equipped at the end of drying machine 8, new air preheating unit is equipped between the front end of drying machine 8 and hot air distribution unit, hot air distribution unit is connected with the front end of drying machine 8 by first three-way 19 and mixed air pipe 17, new air preheating unit includes combined heat exchanger 16, combined heat exchanger 16 is connected with tail gas treatment unit at least, the outlet of combined heat exchanger 16 is connected with the third end of first three-way 19.The hot air distribution unit in the utility model is mainly used to provide heat source to drying machine 8, and in the form of hot air into drying machine 8 to composite fertilizer for drying heating, tail gas treatment unit is mainly used to handle exhaust gas in drying machine 8 and discharge, the essence of the utility model is that a part of waste heat of tail gas is used to preheat new air, and the new air after preheating is mixed with hot air in hot air distribution unit, so as to meet the drying requirement in drying machine 8 while reducing fuel consumption in hot air distribution unit, and the hot air in hot air distribution unit and the new air after preheating can be uniformly mixed by mixed air pipe 17, to realize uniform drying of fertilizer, so as to guarantee drying effect and improve drying quality.The heat source form of hot air distribution unit can be conventional mode such as electricity, fuel oil, coal, biomass, etc.Tail gas treatment unit needs to be used to treat exhaust gas, to avoid pollution environment.

[0028] Further, the tail gas treatment unit includes the end gas phase outlet of drying machine 8 and cyclone separator 9, cyclone separator 9 is connected with first bag-type dust collector 13 through second three-way 20, gravity settling chamber 12, and the outlet of first bag-type dust collector 13 is connected with external discharge pipeline through tail gas fan 14.The utility model realizes the treatment of exhaust gas by setting cyclone separator 9, gravity settling chamber 12 and first bag-type dust collector 13, to avoid pollution environment.

[0029] Further, the third end of second three-way 20 is connected with first tube pass 22 of combined heat exchanger 16 through second bag-type dust collector 15, and tail gas fan 14 is connected with the outlet of first tube pass 22 of combined heat exchanger 16.Through the above setting, the effective utilization of exhaust gas heat energy can be realized, and the treatment of exhaust gas avoids pollution environment.

[0030] The utility model discloses a combined heat exchanger 16 including the shell, the shell one side is established environment fresh air import 24, the shell other side is equipped with preheating fresh air export 25, the shell inside is equipped with gas gas heat exchange part on the side close to environment fresh air import 24, the shell inside is equipped with gas liquid heat exchange part on the other side of preheating fresh air export 25, gas gas heat exchange part is the first tube pass 22 of combined heat exchanger 16, the utility model discloses a combined heat exchanger 16 preferably includes gas gas heat exchange part and gas liquid heat exchange part, and gas gas heat exchange part is mainly used to make the waste gas from dryer and environment fresh air heat exchange, and gas liquid heat exchange part is mainly used to utilize the waste heat of condensate, and the waste heat of condensate is utilized to heat exchange environment fresh air.

[0031] Further, the gas liquid heat exchange part is the second tube pass 23 of combined heat exchanger 16, the second tube pass 23 import of combined heat exchanger 16 is connected with steam condensate pipeline 26, and the second tube pass 23 export of combined heat exchanger 16 is connected with desalted water pipeline 27.

[0032] Further, the first tube pass 22 of combined heat exchanger 16 is the plate exchange type structure, and the material is aluminum alloy, the second tube pass 23 of combined heat exchanger 16 is the tube fin type structure, and the tube material is stainless steel, and the fin structure is aluminum. Through the above-mentioned setting, the heat exchange efficiency can be effectively improved, and the effective utilization of heat energy is realized.

[0033] Further, the first tube pass 22 import of combined heat exchanger 16 is arranged at the upper portion of the shell, and the first tube pass 22 export of combined heat exchanger 16 is arranged at the lower portion of the shell, the second tube pass 23 import of combined heat exchanger 16 is arranged at the lower portion of the shell, and the second tube pass 23 export of combined heat exchanger 16 is arranged at the upper portion of the shell.

[0034] Further, the hot air distribution unit includes the air blower 1 connected with the hot blast furnace 2 import, the outlet of the hot blast furnace 2 is connected with the first three-way pipe 19 through the third three-way pipe 21, and the third end of the third three-way pipe 21 is provided with the air distribution pipeline 3.

[0035] Further, the air distribution pipeline 3 is provided with the first electric air valve 4 and the humidity sensor 6, the hot air machine 7 and the temperature sensor 5 are arranged between the mixed air pipe 17 and the front end of the dryer 8, and the moisture detector 18 is arranged on the dryer 8.

[0036] Further, the second electric air valve 10 is arranged between the third end of the second three-way pipe 20 and the second bag-type dust collector 15, and the third electric air valve 11 is arranged between the second three-way pipe 20 and the gravity settling chamber 12.

[0037] The working principle of the utility model is: the air blower 1 blows air into the hot blast furnace 2, preferably using biomass as fuel, the biomass burns in the hot blast furnace 2 to provide heat, the hot blast is sent to the mixing pipeline 17; the ambient cold blast in the air distribution pipeline 3 enters the mixing pipeline 17 through the first electric air valve 4, the ambient fresh air is heated by the combined heat exchanger 16 to become preheated fresh air and then enters the mixing pipeline 17, the three air flows above are mixed to a certain temperature and then sent to the inside of the dryer 8 through the hot blast fan 7 to exchange heat with the product particles in the inside of the dryer 8 to evaporate the moisture of the product; the waste heat after heat exchange is dedusted by the cyclone dust collector 9, then part of it is sent to the gravity settling chamber 12 and the first bag dust collector 13 through the third electric air valve 11, and then is discharged to the atmosphere by the tail gas fan 14; the other part is dedusted by the second bag dust collector 15 and then is sent to the first tube pass 22 of the combined heat exchanger 16 to exchange heat with the ambient fresh air, and then is discharged to the atmosphere by the tail gas fan 14 after heat exchange; the ambient fresh air after heat exchange enters the second tube pass 23 outside of the combined heat exchanger 16 to exchange heat with the steam condensate from the high tower, the condensate after heat exchange enters the desalted water pipeline 27 to digest and utilize, and the preheated fresh air after heat exchange through the second tube pass 23 of the combined heat exchanger 16 enters the mixing pipeline 17; in the actual use process, the first electric air valve 4, the temperature sensor 5, the humidity sensor 6, the second electric air valve 10, the third electric air valve 11 and the moisture detector 18 are controlled by interlocking programs, because the formula of the drum line production is different, the moisture of the product after drum granulation and entering the dryer 8 is different, the moisture of the product can be detected on line by the moisture detector 18 to adjust the temperature of the hot blast entering the dryer 8, the temperature of the hot blast is monitored in real time by the temperature sensor 5, and the opening of the first electric air valve 4, the second electric air valve 10 and the third electric air valve 11 is adjusted to adjust the flow of the three air flows in the mixing pipeline 17; further, the humidity sensor 6 detects the humidity of the ambient cold blast in real time, and the opening of the first electric air valve 4 can be adjusted based on the humidity.

[0038] The standard parts used in the application file can be purchased from the market, and can be customized according to the description and drawings, the specific connection mode of each part adopts the conventional means such as bolt, rivet and welding in the prior art, the mechanical, part and equipment adopt the conventional type in the prior art, the control mode is automatically controlled by the controller, the control circuit of the controller can be realized by simple programming of the person skilled in the art, which belongs to the common knowledge in the field, and the utility model is mainly used for protecting the mechanical device, so the control mode and circuit connection of the utility model will not be explained in detail, and the external controller mentioned in the description can control the electrical elements mentioned in the text, and the external controller is a conventional known device.

[0039] It should be noted that the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0040] The principles and implementation manners of the present application are described by using specific examples in the present application. The above example is only used to help understand the method and core idea of the present application. The above is only the preferred implementation manner of the present application. It should be noted that, due to the limited expression of the text, there are objectively infinite specific structures. For ordinary skilled persons in the technical field, some improvements, refinements or changes can be made without departing from the principles of the present application. The above technical features can also be combined in an appropriate manner. These improvements, changes or combinations, or the present application without improvement, directly apply the concept and technical solution of the present application to other occasions, should be regarded as the protection scope of the present application.

Claims

1. A drying device in a compound fertilizer drum granulation system, the drying device comprising a dryer (8) for drying compound fertilizer, characterized in that: The front end of the dryer (8) is connected with the hot air distribution unit, the tail end of the dryer (8) is provided with a tail gas treatment unit, and the front end of the dryer (8) and the hot air distribution unit are provided with a fresh air preheating unit; The hot air distribution unit is connected with the front end of the dryer (8) through a first three-way pipe (19) and a mixed air pipe (17), the fresh air preheating unit comprises a combined heat exchanger (16), the combined heat exchanger (16) is connected with the tail gas treatment unit, and the outlet of the combined heat exchanger (16) is connected with the third end of the first three-way pipe (19).

2. The drying device in the compound fertilizer drum granulation system according to claim 1, characterized in that: The tail gas treatment unit comprises that the tail end gas phase outlet of the dryer (8) is connected with a cyclone separator (9), the cyclone separator (9) is connected with a first bag-type dust collector (13) through a second three-way pipe (20) and a gravity settling chamber (12), and the outlet of the first bag-type dust collector (13) is connected with an external exhaust pipeline through a tail gas fan (14).

3. The drying device in the compound fertilizer drum granulation system according to claim 2, characterized in that: The third end of the second three-way pipe (20) is connected with the first tube pass (22) of the combined heat exchanger (16) through a second bag-type dust collector (15), and the outlet of the first tube pass (22) of the combined heat exchanger (16) is connected with the tail gas fan (14).

4. The drying device in the compound fertilizer drum granulation system according to claim 3, characterized in that: The combined heat exchanger (16) comprises a shell, an ambient fresh air inlet (24) is formed in one side of the shell, and a preheated fresh air outlet (25) is arranged on the other side of the shell; a gas-gas heat exchange part is arranged in the shell near the ambient fresh air inlet (24), and a gas-liquid heat exchange part is arranged in the shell on the other side of the preheated fresh air outlet (25); the gas-gas heat exchange part is the first tube pass (22) of the combined heat exchanger (16).

5. The drying device in the compound fertilizer drum granulation system according to claim 4, characterized in that: The gas-liquid heat exchange part is the second tube pass (23) of the combined heat exchanger (16), the inlet of the second tube pass (23) of the combined heat exchanger (16) is connected with a steam condensate pipeline (26), and the outlet of the second tube pass (23) of the combined heat exchanger (16) is connected with a desalted water pipeline (27).

6. The drying device in the compound fertilizer drum granulation system according to claim 5, characterized in that: The first tube pass (22) of the combined heat exchanger (16) is of a plate heat exchanger structure, and the material thereof is aluminum alloy; The second tube pass (23) of the combined heat exchanger (16) is of a tube-fin structure, the tube material is stainless steel, and the fin structure is aluminum.

7. The drying device in the compound fertilizer drum granulation system according to claim 5, characterized in that: The inlet of the first tube pass (22) of the combined heat exchanger (16) is arranged on the upper portion of the shell, and the outlet of the first tube pass (22) of the combined heat exchanger (16) is arranged on the lower portion of the shell; the inlet of the second tube pass (23) of the combined heat exchanger (16) is arranged on the lower portion of the shell, and the outlet of the second tube pass (23) of the combined heat exchanger (16) is arranged on the upper portion of the shell.

8. The drying device in the compound fertilizer drum granulation system according to claim 1, characterized in that: The hot air distribution unit comprises a blower (1) connected with the inlet of a hot air furnace (2), the outlet of the hot air furnace (2) is connected with the first three-way pipe (19) through a third three-way pipe (21), and the third end of the third three-way pipe (21) is provided with a distribution pipeline (3).

9. The drying device in a compound fertilizer drum granulation system according to claim 8, characterized in that: The distribution pipeline (3) is provided with a first electric air valve (4) and a humidity sensor (6); The mixed air pipe (17) and the front end of the dryer (8) are provided with a hot air fan (7) and a temperature sensor (5); and the dryer (8) is provided with a moisture detector (18).

10. The drying device in a compound fertilizer drum granulation system according to claim 3, characterized in that: The third end of the second tee (20) and the second cloth bag dust collector (15) are provided with a second electric air valve (10), and the second tee (20) and the gravity settling chamber (12) are provided with a third electric air valve (11).

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