Moisture absorption and dust removal system for slices

Abstract

The utility model discloses a moisture absorption and dust removal system for slices, which belongs to the technical field of slice drying and is characterized in that a washing tower is additionally arranged, and a low-temperature desalted water spraying pipe is additionally arranged at the top of the washing tower, so that a large amount of water vapor in nitrogen is condensed into water which is left at the bottom of the washing tower, and the effect of separating the water vapor from the nitrogen is achieved; the drying tower can remove dust and water from nitrogen for drying, so that the nitrogen in the drying tower is kept dry and clean all the time, slice finished products are dried, and the product quality can be effectively guaranteed; water in the washing tower is recycled, is pumped through a spraying pump at the bottom, is filtered and cooled, and is conveyed to the top of the washing tower again for spraying; in addition, the filter and the bypass pipe are additionally arranged, so that the system can filter nitrogen for drying under the condition that production is not stopped, the filter can be replaced and cleaned, production is not stopped in the whole process, and quality and production are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to slice drying technical field, especially slice's moisture absorption dust removal system. BACKGROUND

[0002] The production of nylon 6 chip product is by using polymerization process, and the production process of nylon 6 polyamide chip needs to extract the principle. After the extraction of the slice is completed, about 12% water and a small amount of dust will be carried, and the extracted slice needs to be dried, and the dust attached to the surface needs to be cleaned. Because the slice is easy to oxidize, the product quality is reduced, so about 125 DEG C dry hot nitrogen is needed to heat and dry the wet slice. The slice is thrown from top to bottom, and dry hot nitrogen is injected at the bottom. The nitrogen gas forms convection with the slice product from bottom to top, so that the nitrogen gas and the slice particles are fully contacted and penetrated, so that the water in the slice is evaporated, the slice is dehydrated, and the solid phase tackiness is improved, the slice viscosity is improved, and the next process is used.

[0003] The nitrogen gas is extracted from the top of the drying tower by the fan. At this time, the nitrogen gas carries more water and dust, which needs to be heated and separated from the water and nitrogen gas, and recycled. However, in the recycling process, dust and water vapor are contained, which need to be separated before the nitrogen gas is recycled again. Even if the nitrogen gas is discharged, the dust needs to be filtered to avoid pollution of the environment by the tail gas.

[0004] The current process cannot well remove the dust contained in the water. The water containing dust will block the heat exchanger when it is sprayed in circulation, shorten the service life of the heat exchanger, and increase the cleaning frequency. With the accumulation of dust over time, a large amount of dust will accumulate, causing the dust to be sprayed with circulating nitrogen to dry the slice, affecting the quality of the product slice. At the same time, a large amount of dust will also be added to the subsequent process, affecting the quality of the slice product and the cleanliness of the pelletizing system circulating water, increasing the risk of pelletizing stop.

[0005] Therefore, the utility model discloses a slice moisture absorption dust removal system to solve the above problems. Utility model content

[0006] The utility model discloses a slice moisture absorption dust removal system, which increases a washing tower, and a low-temperature desalted water spraying pipe is arranged at the top of the washing tower, so that a large amount of water vapor in the nitrogen gas is condensed into water and stays at the bottom of the washing tower, achieving the effect of separating water vapor from nitrogen gas. The nitrogen gas used for drying can be de-dusted and de-watered, so that the nitrogen gas in the drying tower always remains dry and clean, the slice product is dried, and the product quality is effectively guaranteed. The water in the washing tower is recycled, pumped by the spraying pump at the bottom, filtered and cooled, and then sprayed at the top of the washing tower again.

[0007] The utility model discloses a slice's moisture absorption and dust removal system, including:

[0008] Drying tower, shell and tube heat exchanger, washing tower, filter and bypass pipe;

[0009] The drying tower is the closed jar body of vertical arrangement, the drying tower top portion is connected with slice finished product pipeline, and the bottom of drying tower is also connected with slice finished product output pipeline;

[0010] The inner chamber of drying tower is also connected with an output fan, and the air inlet pipe of output fan is arranged at the top of the inner chamber of drying tower, and the air outlet pipe of output fan is communicated with the tube side air inlet of shell and tube heat exchanger;

[0011] The inner chamber top of washing tower is provided with air outlet and spray pipe, and the tube side air outlet of shell and tube heat exchanger is communicated with the air inlet of washing tower;

[0012] The top of washing tower is also provided with air outlet, and the top air outlet of washing tower is communicated with the shell side air inlet of shell and tube heat exchanger, and the shell side air outlet of shell and tube heat exchanger is connected with deaerator, and the rear end of deaerator is sequentially connected with input fan and input heater, and the input heater is communicated with the inner chamber of drying tower;

[0013] The rear end of washing tower is also provided with spray pump, and the water suction port of spray pump is communicated with the inner chamber bottom of washing tower, and the bottom of washing tower is also connected with liquid seal groove;

[0014] The rear end of spray pump is provided with external heat exchanger, and filter and bypass pipe are connected between spray pump and external heat exchanger, the bypass pipe is the pipeline with valve, and the filter and bypass pipe are parallelly arranged between spray pump and external heat exchanger;

[0015] The water outlet of external heat exchanger is connected with the spray pipe in washing tower.

[0016] Further, the drying tower is also connected with standby heater, the air inlet of standby heater is communicated with the air outlet of output fan through tee joint, and the air inlet of standby heater is provided with valve;

[0017] The output fan, standby heater and input heater are sequentially connected in the inner chamber of drying tower from top to bottom.

[0018] Further, one maintenance valve is arranged at each of the front and rear ends of filter, and both maintenance valves are in the range of connection with bypass pipe.

[0019] Further, the liquid seal tank is a closed water tank, a blowdown port of the washing tower is immersed in a bottom of an inner cavity of the liquid seal tank through a pipeline, and the liquid seal tank is filled with clean water;

[0020] The spray pipe is sealingly connected with the washing tower, the spray pipe is uniformly provided with atomizing nozzles, and the water spraying directions of the atomizing nozzles on the spray pipe are downward.

[0021] Further, the filter is a high-precision filter.

[0022] The utility model discloses a drying tower and a filter are arranged in the drying tower, the filter is arranged in the pipeline of the drying tower, and the filter is used for filtering the nitrogen gas in the pipeline.

[0023] 2, the nitrogen gas used in the drying tower of the device is recycled, which greatly reduces the nitrogen gas loss, and the nitrogen gas used in the drying tower is directly used, the nitrogen gas circulating in the pipeline is dusted and separated from water vapor through the washing tower, and then is recycled after being heated, forming a complete nitrogen gas circulation loop, which is more convenient to use.

[0024] 3, the water used for dusting the nitrogen gas is also recycled, and the filter filters the cooling water after dusting, effectively intercepts the dust in the water, keeps the water in the washing tower clean, and cools the water vapor through the cooling water to condense water, so that the water continuously increases, and the continuously increasing water carries part of the dust, and the condensed water enters the pelletizing system after being intercepted by the liquid seal tank, and is recycled.

[0025] 4, the bypass pipe is arranged, the circulating water can be filtered without stopping during production, the filter can be cleaned and replaced, the whole process does not stop production, the nitrogen gas can be continuously purified and dried, the slice product can be continuously produced, and the production purpose of quality and yield is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The utility model will be further described in connection with the embodiments and with reference to the drawings.

[0027] Figure 1 It is the whole structure schematic diagram of the utility model.

[0028] In the drawings, the component list represented by each sign is as follows:

[0029] 1-drying tower, 11-output fan, 12-back-up heater, 13-input fan, 14-input heater, 2-tube shell heat exchanger, 21-oxygen remover, 3-washing tower, 31-spraying pump, 32-liquid seal tank, 33-spraying pipe, 4-filter, 41-bypass pipe, 42-external heat exchanger, 43-repair valve. DETAILED DESCRIPTION

[0030] Referring to Figure 1 The utility model provides a slice's moisture absorption and dust removal system, in order to better understand the above technical scheme, below will combine with the specific embodiment of the specification and the above technical scheme are explained in detail.

[0031] In one embodiment of the utility model technical scheme:

[0032] Including drying tower 1, shell and tube heat exchanger 2, washing tower 3, filter 4 and bypass pipe 41;

[0033] Drying tower 1 is the closed jar body of vertical arrangement, and the top of drying tower 1 is communicated with slice finished product pipeline, and the bottom of drying tower 1 is also connected with slice finished product output pipeline;

[0034] The inner chamber of drying tower 1 is also connected with an output fan 11, and the air inlet pipe of output fan 11 is arranged at the top of the inner chamber of drying tower 1;The air outlet pipe of output fan 11 is communicated with the tube side gas inlet of shell and tube heat exchanger 2;

[0035] The inner chamber top of washing tower 3 is provided with a gas outlet and a spray pipe 33, and the tube side gas outlet of shell and tube heat exchanger 2 is communicated with the gas inlet of washing tower 3;

[0036] The top of washing tower 3 is also provided with a gas outlet, and the top gas outlet of washing tower 3 is communicated with the shell side gas inlet of shell and tube heat exchanger 2, and the shell side gas outlet of shell and tube heat exchanger 2 is connected with deaerator 21, and the rear end of deaerator 21 is sequentially connected with input fan 13 and input heater 14, and input heater 14 is communicated with the inner chamber of drying tower 1;

[0037] The drying tower 1 is also connected with standby heater 12, and the air inlet of standby heater 12 is communicated with the air outlet of output fan 11 through a tee joint, and a valve is arranged on the air inlet of standby heater 12;

[0038] Output fan 11, standby heater 12 and input heater 14 are sequentially connected in the inner chamber of drying tower 1 from top to bottom, and input heater 14 is arranged close to the inner chamber bottom of drying tower 1, and standby heater 12 is connected in the middle section of drying tower 1, and output fan 11 is communicated in the top of the inner chamber of drying tower 1, and output fan 11 and the conveying pipe of slice finished product do not interfere with each other. Standby heater 12 is used when repairing shell and tube heat exchanger 2, and the whole process does not stop production.

[0039] The back end of the washing tower 3 is also provided with a spray pump 31, the suction port of the spray pump 31 is communicated with the bottom of the inner cavity of the washing tower 3, and the bottom of the washing tower 3 is also connected with a liquid seal tank 32; the liquid seal tank 32 is a closed water tank, the exhaust port of the washing tower 3 is immersed in the bottom of the inner cavity of the liquid seal tank 32 through a pipeline, and the liquid seal tank 32 is filled with clean water; the liquid seal tank 32 plays a role in dust removal, and then the water used for dust removal through the liquid seal tank 32 is overflowed to the pelletizing system for recycling, that is, the water containing slice particle impurities is transported back to the slice product conveying pipeline, and the water containing impurities here is used for conveying the slice product, but it does not belong to impurity water because the impurities contained in it are generated during the production of the slice and belong to the same type of water, which can be mixed and used. Not only the water resource is recycled, but also the product quality is not affected.

[0040] The back end of the spray pump 31 is provided with an external heat exchanger 42, and a filter 4 and a bypass pipe 41 are connected between the spray pump 31 and the external heat exchanger 42, the bypass pipe 41 is a pipeline with a valve, and the filter 4 and the bypass pipe 41 are arranged in parallel between the spray pump 31 and the external heat exchanger 42; the water outlet of the external heat exchanger 42 is connected with a spray pipe 33 in the washing tower 3; the spray pipe 33 is sealingly connected with the washing tower 3, and the spray pipe 33 is uniformly provided with atomizing nozzles, and the water spraying direction of the atomizing nozzles on the spray pipe 33 is downward. One maintenance valve 43 is arranged at each of the front end and the rear end of the filter 4, and the two maintenance valves 43 are both located in the range of the connection position of the bypass pipe 41. The water of the spray pump 31 is transported and used through the bypass pipe 41, so that shutdown can be avoided, as long as the spray pump 31 does not stop, the washing tower 3 can be ensured to not stop, so that the nitrogen gas can continue to be purified, and the nitrogen gas in the washing tower 3 is sprayed and dusted and separated from water vapor for a short time, which is completely feasible, and as long as the nitrogen gas can be continuously dried and dusted, it can continue to enter the drying tower 1 for production, to ensure continuous production of the slice product, so that the entire system does not need to stop production even if there are many impurities that need to be cleaned, and the effect of ensuring production and quality is achieved. The complete production system is formed through the bypass pipe 41, and the filter 4 is closed for quick maintenance and replacement through the maintenance valve 43, and then the production is switched back to the filter 4, which is convenient and flexible to use and stable in yield.

[0041] The filter 4 is a high-precision filter, which effectively filters the water used at the bottom of the washing tower 3, so that the water returned to the spray pipe 33 at the top of the washing tower 3 is in a clean state again.

[0042] The nitrogen gas flow is extracted from the top of the drying tower 1, flows along the output fan 11, the tube side of the shell-and-tube heat exchanger 2, the washing tower 3, and then flows back to the shell side of the shell-and-tube heat exchanger 2, and finally returns to the inside of the drying tower 1 along the deaerator 21, the input fan 13 and the input heater 14, to form a complete gas flow loop;

[0043] The water flow also forms a complete loop, which starts from the washing tower 3, is pumped out by the spray pump 31, is filtered through the filter 4, is cooled through the external heat exchanger 42, and is finally sprayed into the washing tower 3 through the spray pipe 33 at a water temperature of 10 DEG C, so as to cool and dust the nitrogen gas and condense the water vapor, the water with the slice dust is filtered out through the liquid seal tank 32, the slice dust is dissolved in the liquid seal tank 32, and the nitrogen gas is discharged into the air, without polluting the air.

[0044] Meanwhile, the connecting pipe of the liquid seal tank 32 and the washing tower 3 is at a certain height from the bottom of the washing tower 3, which can be 30 cm, and the structure forms an overflow structure, so that the water amount in the washing tower 3 is stable, without being too much or too little, when the condensed water vapor is more, the excess water in the washing tower 3 flows into the slice conveying pipeline through the liquid seal tank 32, and when the water amount in the washing tower 3 is not much, the overflow does not occur.

[0045] In use, the slice with dust and a large amount of water vapor enters the drying tower 1, is heated by the high-temperature nitrogen gas sent by the input heater 14 and the input fan 13, forms a reverse airflow, and sends away the dust and water vapor attached to the slice through the output fan 11, leaves the heat through the tube shell heat exchanger 2, and cools the nitrogen gas, the nitrogen gas enters the washing tower 3, is sprayed and cooled by the spray pipe 33, further collects the dust in the nitrogen gas, cools the water vapor, and condenses the water vapor into liquid water, the water with dust is pumped into the filter 4 through the spray pump 31, the filter 4 filters the dust impurities, the water is sprayed out through the spray pipe 33, and the water in the spray pipe 33 is cooled through the external heat exchanger 42, so that the low-temperature water mist is always sprayed to cool the nitrogen gas.

[0046] The purified nitrogen gas enters the deaerator through the shell side of the tube shell heat exchanger 2, is further purified, avoids mixing of oxygen into the drying tower 1, and is dried and dusted again through the input heater 14 and the input fan 13.

[0047] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific embodiments described are only illustrative, and are not used to limit the scope of the present application, and equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present application should be covered in the scope of protection of the claims of the present application.

Claims

1. A slicing, moisture absorbing and dust removing system, characterized by, The application relates to a drying tower (1), a tube-shell heat exchanger (2), a washing tower (3), a filter (4) and a bypass pipe (41). The drying tower (1) is a closed vertical tank, the top of the drying tower (1) is communicated with a flake product pipeline, and the bottom of the drying tower (1) is further connected with a flake product output pipeline. An output fan (11) is further connected to the inner cavity of the drying tower (1), the air inlet pipe of the output fan (11) is arranged at the top of the inner cavity of the drying tower (1), and the air outlet pipe of the output fan (11) is communicated with the tube inlet of the tube-shell heat exchanger (2). A gas outlet and a spraying pipe (33) are arranged at the top of the inner cavity of the washing tower (3), and the tube outlet of the tube-shell heat exchanger (2) is communicated with the gas inlet of the washing tower (3). A gas outlet is further arranged at the top of the washing tower (3), the gas outlet at the top of the washing tower (3) is communicated with the shell inlet of the tube-shell heat exchanger (2), the shell outlet of the tube-shell heat exchanger (2) is connected with a deaerator (21), the rear end of the deaerator (21) is sequentially connected with an input fan (13) and an input heater (14), and the input heater (14) is communicated with the inner cavity of the drying tower (1). A spraying pump (31) is further arranged at the rear end of the washing tower (3), the water suction port of the spraying pump (31) is communicated with the bottom of the inner cavity of the washing tower (3), and the bottom of the washing tower (3) is further connected with a liquid seal groove (32). The rear end of the spraying pump (31) is provided with an external heat exchanger (42), the filter (4) and the bypass pipe (41) are connected between the spraying pump (31) and the external heat exchanger (42), the bypass pipe (41) is a pipeline provided with a valve, and the filter (4) and the bypass pipe (41) are arranged in parallel between the spraying pump (31) and the external heat exchanger (42). The water outlet of the external heat exchanger (42) is connected with the spraying pipe (33) in the washing tower (3). A standby heater (12) is further connected to the drying tower (1), the air inlet of the standby heater (12) is communicated with the air outlet of the output fan (11) through a three-way pipe, and a valve is arranged on the air inlet of the standby heater (12).

2. A slice hygroscopic dust removal system according to claim 1, characterized in that: The output fan (11), the standby heater (12) and the input heater (14) are sequentially connected in the inner cavity of the drying tower (1) from top to bottom. A maintenance valve (43) is arranged at each of the front end and the rear end of the filter (4), and the two maintenance valves (43) are both arranged in the range of the connection position with the bypass pipe (41).

3. A slice hygroscopic dust removal system according to claim 1, characterized in that: The liquid seal groove (32) is a closed water tank, a sewage outlet of the washing tower (3) is immersed in the bottom of the inner cavity of the liquid seal groove (32) through a pipeline, and the liquid seal groove (32) is filled with clean water.

4. A slice hygroscopic dust removal system according to claim 1, characterized in that: The spraying pipe (33) is sealingly connected with the washing tower (3), atomizing nozzles are uniformly arranged on the spraying pipe (33), and the water spraying directions of the atomizing nozzles on the spraying pipe (33) are downward. The filter (4) is a high-precision filter.

5. A slice's moisture and dust removal system according to claim 1, characterized in that: ​

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