CN217287842U

CN217287842U - Dewatering equipment

Info

Publication number: CN217287842U
Application number: CN202122908455.1U
Authority: CN
Inventors: 刘涛; 宋玲; 苏柯洋
Original assignee: Sichuan Jereh Hengri Natural Gas Engineering Co ltd
Current assignee: Sichuan Jereh Hengri Natural Gas Engineering Co ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-08-26
Anticipated expiration: 2031-11-24

Abstract

The application discloses dehydration equipment, which comprises at least two drying towers, an air inlet pipe, a first branch pipe, a second branch pipe, a heat exchanger, a heater, a dry air outlet pipe, a cold blowing air inlet pipe, a cold blowing air outlet pipe, a hot blowing air inlet pipe and a hot blowing air outlet pipe, wherein the dry air outlet pipes are communicated with the drying towers, and the heater is arranged in the hot blowing air inlet pipe; the first branch pipe and the second branch pipe are communicated with an air inlet pipe, the first branch pipe is communicated with each drying tower, and the second branch pipe is communicated with each drying tower through a cold blowing air inlet pipe; the heat exchanger is provided with a first medium inlet, a first medium outlet, a second medium inlet and a second medium outlet which are communicated, the cold blowing air outlet pipe is communicated with each drying tower and the first medium inlet respectively, the hot blowing air inlet pipe is communicated with the first medium outlet and each drying tower respectively, and the hot blowing air outlet pipe is communicated with each drying tower and the second medium inlet respectively. The scheme can solve the problem of heat loss of the dewatering equipment.

Description

Dewatering equipment

Technical Field

The application belongs to the technical field of chemical equipment, and particularly relates to dewatering equipment.

Background

The dehydration is a relatively common process in the chemical field, and the common dehydration methods mainly comprise a low-temperature dehydration method, a solid desiccant adsorption method and a solvent absorption method, wherein the low temperature allowed by the low-temperature dehydration method is limited, the dehydration depth of the solvent adsorption method is smaller, the low temperature allowed by the solid desiccant adsorption method is lower, and the dehydration depth is larger, so that the solid desiccant adsorption method has greater advantages.

The solid desiccant adsorption method may specifically include a silica gel method and a molecular sieve method, and the molecular sieve method is more commonly used because of its advantages such as strong adsorption selectivity, high adsorption property under low water vapor partial pressure, and the like. The purpose of dehydration is mainly realized to the drying tower that utilizes to the molecular sieve method, in order to promote dehydration efficiency, can set up two at least drying towers, the process of absorption and regeneration can be realized respectively to the drying tower of difference, the regeneration process can specifically be divided into hot blow and cold blow two steps, during hot blowing, need introduce outside heat source and heat the regeneration gas, the regeneration gas after hot blowing needs outside cold source to cool off hot regeneration gas, the waste heat of hot regeneration gas does not carry out recycle, and then causes calorific loss.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a dewatering device, which can solve the problem of heat loss of the dewatering device.

In order to solve the technical problem, the present application is implemented as follows:

the application provides a dewatering device, which comprises drying towers, an air inlet pipe, a first branch pipe, a second branch pipe, a heat exchanger, a heater, a drying air outlet pipe, a cold blowing air inlet pipe, a cold blowing air outlet pipe, a hot blowing air inlet pipe and a hot blowing air outlet pipe, wherein the number of the drying towers is at least two, the drying air outlet pipe is communicated with each drying tower, and the heater is arranged in the hot blowing air inlet pipe;

the first branch pipe and the second branch pipe are communicated with the air inlet pipe, the first branch pipe is communicated with the drying towers, and the second branch pipe is communicated with the drying towers through the cold blowing air inlet pipe;

the heat exchanger is provided with a first medium inlet and a first medium outlet which are communicated with each other, and a second medium inlet and a second medium outlet which are communicated with each other, the cold blowing air outlet pipe is respectively communicated with each drying tower and the first medium inlet, the hot blowing air inlet pipe is respectively communicated with the first medium outlet and each drying tower, and the hot blowing air outlet pipe is respectively communicated with each drying tower and the second medium inlet.

In this application, gas in the intake pipe can divide into two strands, one strand of gas gets into the drying tower through first branch pipe and implements the adsorption operation, another strand of gas is as cold blowing, this cold blowing gets into other drying tower through second branch pipe and cold blowing intake pipe and implements the cold blowing operation, gas after the cold blowing gets into the heat exchanger through cold blowing outlet duct, later get into the hot blowing intake pipe, this part of gas is heated behind the heater, thereby get into other drying towers through the hot blowing intake pipe and implement the hot blowing operation, gas after the hot blowing gets into the heat exchanger through the hot blowing outlet duct. Because the gas after cold blowing and the gas after hot blowing all get into the heat exchanger, this two parts of gas can carry out the heat exchange to gas after cold blowing is heated through the waste heat of the gas after hot blowing, make the temperature of the gas after cold blowing rise, so that this part of gas is blown the operation of implementing hot blowing as hot. Therefore, the waste heat of the gas after hot blowing can be fully utilized, so that the energy required by the gas after cold blowing is lower without extra heating or heating, meanwhile, the temperature of the gas after hot blowing is reduced after heat exchange, the extra cooling or the required cooling degree is lower, and the problem of heat loss of the dehydration equipment is solved. And the gas as cold blowing gas and hot blowing gas is all taken from the air inlet pipe, and an additional air source is not needed, so that the structure of the dehydration equipment is simpler.

Drawings

Fig. 1 is a schematic structural diagram of a dewatering device disclosed in an embodiment of the present application.

In fig. 1, arrows indicate flow directions.

Description of reference numerals:

110-drying tower, 111-first drying tower, 112-second drying tower, 113-third drying tower, 120-air inlet pipe, 130-first branch pipe, 140-second branch pipe, 150-heat exchanger, 160-heater, 170-dry air outlet pipe, 180-cold air blowing inlet pipe, 190-cold air blowing outlet pipe, 210-hot air blowing inlet pipe, 220-hot air blowing outlet pipe, 230-return pipe, 240-flow regulating valve, 250-flow detecting piece, 260-cooler, 270-separator, 280-air guide pipe, 290-program control valve, 310-heat oil conducting inflow pipe and 320-heat oil conducting outflow pipe.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.

The following describes the dewatering device provided in the embodiments of the present application in detail through specific embodiments and application scenarios thereof with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present application discloses a dehydration apparatus that may be used to implement dehydration treatment of natural gas, and may include a drying tower 110, an air inlet pipe 120, a first branch pipe 130, a second branch pipe 140, a heat exchanger 150, a heater 160, a dry air outlet pipe 170, a cold blow air inlet pipe 180, a cold blow air outlet pipe 190, a hot blow air inlet pipe 210, and a hot blow air outlet pipe 220.

The number of the drying towers 110 is at least two, and different drying towers 110 may alternately perform different processes. Alternatively, the number of the drying towers 110 is at least three, and further alternatively, the number of the drying towers 110 may be three, wherein one drying tower 110 may perform the adsorption process, one drying tower 110 may perform the cold blowing process, and the remaining one drying tower 110 may perform the hot blowing process. When the number of the drying towers 110 is three, different technological processes are realized by different drying towers 110, and the whole dehydration equipment can continuously and stably run, so that the dehydration efficiency is improved, and meanwhile, the cost of the dehydration equipment is lower. In addition, after the natural gas is dehydrated by the dehydration equipment, the water content of the natural gas can be less than 1ppm, and the dehydration effect is better.

The drying gas outlet pipe 170 is communicated with each drying tower 110, and the drying gas outlet pipe 170 can allow the dehydrated drying gas to flow out of the dehydration equipment and then enter downstream equipment.

The gas inlet 120 may be in communication with a gas source, which may provide gas to be dehydrated into the dehydration apparatus. The first branch pipe 130 and the second branch pipe 140 are both communicated with the air inlet pipe 120, the first branch pipe 130 is communicated with each drying tower 110, and the second branch pipe 140 is communicated with each drying tower 110 through the cold blow air inlet pipe 180. The inlet ends of the first branch tube 130 and the second branch tube 140 are both communicated with the outlet end of the inlet tube 120, so that the gas in the inlet tube 120 can be divided into two streams, one stream of gas enters the first branch tube 130, and the other stream of gas enters the second branch tube 140. The gas in the first branch pipe 130 can directly enter the drying tower 110 to realize the adsorption operation, and the gas in the second branch pipe 140 can be used as the regeneration gas to realize the cold blowing operation and the hot blowing operation of the drying tower 110, so that the drying tower 110 can be regenerated, and the regenerated drying tower 110 can be rapidly cooled to continuously realize the adsorption operation. Alternatively, the ratio of the gas in the first branch pipe 130 to the gas in the gas inlet pipe 120 may be 85-90%, and the ratio of the gas in the second branch pipe 140 to the gas in the gas inlet pipe 120 may be 10-15%.

The heat exchanger 150 has a first medium inlet and a first medium outlet which are communicated with each other, and a second medium inlet and a second medium outlet which are communicated with each other, the cold blow gas outlet duct 190 is respectively communicated with each drying tower 110 and the first medium inlet, the hot blow gas inlet duct 210 is respectively communicated with the first medium outlet and each drying tower 110, and the hot blow gas outlet duct 220 is respectively communicated with each drying tower 110 and the second medium inlet. In other words, the passage between the first medium inlet and the first medium outlet supplies the flow of gas in the cold blowing gas outlet pipe 190, and the passage between the second medium inlet and the second medium outlet supplies the flow of gas in the hot blowing gas inlet pipe 210. The heater 160 is disposed at the hot blow gas inlet pipe 210, and the heater 160 can heat the gas in the hot blow gas inlet pipe 210, so that the part of the gas meets the temperature required by the hot blow process.

The gas in the second branch pipe 140 may be firstly used as cold blowing gas, the cold blowing gas enters the drying tower 110 through the cold blowing gas inlet pipe 180 to perform cold blowing operation, the cold blown gas enters the heat exchanger 150 through the cold blowing gas outlet pipe 190 and then enters the hot blowing gas inlet pipe 210, the part of the gas is heated after passing through the heater 160, thereby entering the other drying towers 110 through the hot blowing gas inlet pipe 210 to perform hot blowing operation, and the hot blown gas enters the heat exchanger 150 through the hot blowing gas outlet pipe 220. Because the gas after the cold blowing and the gas after the hot blowing both enter the heat exchanger 150, the two parts of gas can exchange heat, so that the gas after the cold blowing is operated by the waste heat of the gas after the hot blowing, the temperature of the gas after the cold blowing is increased, and the part of gas can be used as the hot blowing to implement the hot blowing operation. Therefore, the waste heat of the gas after hot blowing can be fully utilized, so that the energy required by the gas after cold blowing is lower without extra heating or heating, meanwhile, the temperature of the gas after hot blowing is reduced after heat exchange, the extra cooling or the required cooling degree is lower, the problem of heat loss of the dehydration equipment is solved, and the effects of energy conservation and emission reduction are realized. And, the gas as the cold blow gas and the hot blow gas is taken from the gas inlet pipe 120, and an additional gas source is not required, so that the structure of the dehydration apparatus is simpler.

It should be noted that program control valves may be disposed on each pipeline of the dehydration equipment, so as to control the corresponding pipeline to be in a conducting state or a disconnecting state, so as to switch the drying towers 110 between different dehydration processes, and simultaneously, enable each drying tower 110 to simultaneously implement different dehydration processes.

Optionally, the gas in the hot-blowing gas outlet pipe 220 may be directly exhausted, but in order to avoid gas waste, the dehydration apparatus further includes a return pipe 230, the return pipe 230 is respectively communicated with the second medium outlet and the first branch pipe 130, that is, the gas in the hot-blowing gas outlet pipe 220 enters the return pipe 230 through the second medium outlet of the heat exchanger 150 after heat exchange, and then flows back to the first branch pipe 130 through the return pipe 230, so as to join with the gas in the first branch pipe 130, and then directly enters the drying tower 110 for dehydration. It can be seen that, while the embodiment performs the cold blowing and hot blowing operations by using a part of the gas to be dehydrated, the embodiment can also achieve the reflux adsorption of the part of the gas, so that all the gas in the gas inlet pipe 120 can be dehydrated, and therefore, the embodiment can avoid the waste of the gas.

There may be a case where the pressure of the gas in the inlet pipe 120 is excessively large, and therefore, in order to improve the dehydration effect, a flow rate adjustment valve 240 may be provided on the first branch pipe 130, and the flow rate adjustment valve 240 may perform flow rate adjustment and reduce the pressure of the gas. Further, the second branch pipe 140 is provided with a flow detecting member 250, the flow regulating valve 240 is electrically connected to the flow detecting member 250, the flow detecting member 250 can detect the flow of the gas in the second branch pipe 140, the detected value can be fed back to the flow regulating valve 240, and the flow regulating valve 240 can regulate the flow of the gas in the first branch pipe 130 accordingly, so that the flow of the gas in the first branch pipe 130 and the second branch pipe 140 is more beneficial to the implementation of the dehydration operation.

Since the gas in the first branch pipe 130 has a pressure loss after the cold blowing and hot blowing operations, if the return pipe 230 is connected to the upstream of the flow rate adjustment valve 240, the gas in the return pipe 230 cannot enter the first branch pipe 130 easily due to insufficient pressure of the gas in the return pipe 230. For this reason, the connection point of the return pipe 230 and the first branch pipe 130 may be located between the flow rate adjustment valve 240 and each drying tower 110, and since the gas pressure downstream of the flow rate adjustment valve 240 is small, the gas in the return pipe 230 may more reliably enter the first branch pipe 130, and may enter any drying tower 110 with the gas in the first branch pipe 130 for dehydration.

As described above, the gas in the hot blowing gas outlet pipe 220 flows into the heat exchanger 150 to perform a heat exchange operation, so that the temperature of the gas flowing from the heat exchanger 150 into the return pipe 230 is lowered, and if the temperature of the gas in the return pipe 230 is low enough, additional cooling is not required, but if the temperature of the gas in the return pipe 230 is still high, additional cooling is required to make the part of the gas meet the dehydration requirement. Therefore, a cooler 260 may be disposed on the return line 230, and the cooler 260 may cool the gas in the return line 230 so that the temperature of the portion of the gas is lower. Because the gas in the hot blowoff gas outlet pipe 220 is firstly subjected to heat exchange through the heat exchanger 150, the temperature of the gas is already reduced before entering the cooler 260, and the cooler 260 can meet the cooling requirement only by needing less cooling medium (such as water), so the consumption of the cooling medium of the cooler 260 is less, and the cooling load is lower.

The gas in the return pipe 230 may carry moisture such as sewage, and once the moisture flows back with the gas, the components such as the pipeline and the drying tower 110 are easily blocked or even damaged. Therefore, in an alternative embodiment, the return pipe 230 is further provided with a separator 270, the separator 270 is located downstream of the cooler 260, the separator 270 can perform a gas-liquid separation operation on the gas cooled in the return pipe 230, so as to separate moisture in the gas, the separated moisture can be discharged to the outside, and the separated gas flows back to the first branch pipe 130.

During the actual operation of the dehydration plant, there may be a case where the temperature of the gas in the cold blow gas outlet duct 190 is higher than the temperature of the gas in the hot blow gas outlet duct 220, for example, when the dehydration plant just starts cold blowing. In this case, if the gas in the cold blowing gas outlet duct 190 enters the heat exchanger 150, the temperature of the gas in the cold blowing gas outlet duct 190 does not increase but decreases, and thus heat loss occurs. Based on this, optionally, the dehydration device further includes a gas duct 280, one end of the gas duct 280 is communicated with the cold-blowing gas outlet pipe 190, the other end of the gas duct 280 is communicated with the hot-blowing gas inlet pipe 210, the connection position of the gas duct 280 and the hot-blowing gas inlet pipe 210 is located between the heater 160 and the heat exchanger 150, and the gas duct 280 can be switched between a conducting state and a disconnecting state. Optionally, the airway tube 280 may be provided with a programmable valve 290 such that the airway tube 280 is in an on state or an off state via the programmable valve 290. After the arrangement, if the temperature of the gas in the cold blowing gas outlet pipe 190 is higher than that of the gas in the hot blowing gas outlet pipe 220, the gas guide pipe 280 can be directly in a conducting state, so that the gas in the cold blowing gas outlet pipe 190 does not pass through the heat exchanger 150 and directly enters the heater 160, and therefore heat loss of the gas in the cold blowing gas outlet pipe 190 is prevented.

The same drying tower 110 needs to be connected with a plurality of pipelines such as the first branch pipe 130, the cooling gas inlet pipe 120 and the cooling gas outlet pipe, and the drying tower 110 can be correspondingly provided with different communicating ports aiming at all the pipelines connected with the drying tower 110, but the structure of the drying tower 110 is too complex due to the arrangement, and the sealing requirement of the drying tower 110 can be improved along with the arrangement. In other embodiments, the drying towers 110 are provided with a first communication port and a second communication port, the first branch pipe 130, the cold blowing air inlet pipe 180 and the hot blowing air outlet pipe 220 are all communicated with the first communication port of each drying tower 110, and the dry blowing air outlet pipe 170, the cold blowing air outlet pipe 190 and the hot blowing air inlet pipe 210 are all communicated with the second communication port of each drying tower 110. At this time, the gas in the first branch pipe 130 enters the drying tower 110 through the first communicating port and flows into the drying gas outlet pipe 170 through the second communicating port; the gas in the cold blowing gas inlet pipe 180 enters the drying tower 110 through the first communicating port and flows into the cold blowing gas outlet pipe 190 through the second communicating port; the gas in the hot-blow gas inlet pipe 210 enters the drying tower 110 through the second communication port and flows into the hot-blow gas outlet pipe 220 through the first communication port. Because the absorption, the hot blowing and the cold blowing of the same drying tower 110 are carried out successively, the first branch pipe 130, the cold blowing air inlet pipe 180 and the hot blowing air outlet pipe 220 are connected with the same first communicating port, and the drying air outlet pipe 170, the cold blowing air outlet pipe 190 and the hot blowing air inlet pipe 210 are connected with the same second communicating port, so that the gas interference can not be caused, the structure of the drying tower 110 can be simplified, and the sealing requirement of the drying tower 110 is reduced.

The structure of the heater 160 can be flexibly selected, and for example, an electric heater or the like can be used. In an optional embodiment, the dehydration apparatus further includes a heat transfer oil inflow pipe 310 and a heat transfer oil outflow pipe 320, the heater 160 is provided with a gas channel, a heat transfer oil inlet, and a heat transfer oil outlet, the gas channel is communicated with the hot-blast air inlet pipe 210, the heat transfer oil inflow pipe 310 is communicated with the heat transfer oil inlet, and the heat transfer oil outflow pipe 320 is communicated with the heat transfer oil outlet. The heat conducting oil inflow pipe 310 and the heat conducting oil outflow pipe 320 can supply heat conducting oil to flow, wherein the temperature of the heat conducting oil in the heat conducting oil inflow pipe 310 is high, and the gas in the hot blowing gas inlet pipe 210 exchanges heat with the heat conducting oil through a gas channel, so that the temperature of the gas in the hot blowing gas inlet pipe 210 is increased. The heater 160 has the advantages of simple structure, high heating efficiency, strong heating uniformity and the like.

The operation of the dehydration apparatus will be briefly described below by taking three drying towers 110 shown in fig. 1 as an example. The three drying towers 110 are a first drying tower 111, a second drying tower 112, and a third drying tower 113, respectively. The gas in the first branch pipe 130 is decompressed by the flow regulating valve 240, and then directly enters the first drying tower 111 through the program control valve for adsorption dehydration, the cycle of the adsorption operation can be 8 hours, and the dehydrated dry gas enters the dry gas outlet pipe 170 from the bottom of the drying tower 110 through the program control valve, and then enters downstream equipment; the gas in the second branch pipe 140 is used as regeneration gas, and firstly enters the second drying tower 112 through the cold blowing gas inlet pipe 180 via the program control valve for cold blowing, the cycle of the cold blowing operation can be 8 hours, the cold blown gas sequentially passes through the heat exchanger 150 and the heater 160 to form hot regeneration gas with the temperature of about 280 ℃, the hot regeneration gas enters the third drying tower 113 from the bottom of the third drying tower 113 via the program control valve through the hot blowing gas inlet pipe 210, so that the hot blowing is performed on the hot regeneration gas, the regeneration of the third drying tower 113 is further realized, the water adsorbed in the molecular sieve is heated and desorbed, and the cycle of the regeneration operation can be 8 hours. The hot blown gas sequentially enters the heat exchanger 150 and the cooler 260 through the program control valve and the hot blown gas outlet pipe 220, is cooled to about 40 ℃, and then enters the separator 270 for gas-liquid separation to separate moisture in the gas, the moisture can be discharged to the outside, and the separated gas returns to the downstream of the flow regulating valve 240 of the first branch pipe 130, is merged with the gas in the first branch pipe 130 and enters the first drying tower 111 in an adsorption state through the program control valve for adsorption. After the heating regeneration of the third drying tower 113 is finished, the regenerated gas enters the top of the third drying tower 113 through the programmable valve and the cold blowing gas inlet pipe 180, and then the third drying tower 113 is subjected to cold blowing, so that the temperature of the third drying tower 113 is reduced to about 40 ℃, and the first drying tower 111 can be heated and regenerated after the cold-blown gas is heated to about 280 ℃ through the heat exchanger 150 and the heater 160.

After the first drying tower 111 finishes the adsorption, the process can be switched to the second drying tower 112 for adsorption, and meanwhile, the third drying tower 113 is subjected to cold blowing, the first drying tower 111 is subjected to heating regeneration, and the process is circulated.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The dehydration equipment is characterized by comprising at least two drying towers (110), air inlet pipes (120), a first branch pipe (130), a second branch pipe (140), a heat exchanger (150), heaters (160), a dry air outlet pipe (170), a cold blowing air inlet pipe (180), a cold blowing air outlet pipe (190), a hot blowing air inlet pipe (210) and a hot blowing air outlet pipe (220), wherein the dry air outlet pipes (170) are communicated with the drying towers (110), and the heaters (160) are arranged in the hot blowing air inlet pipe (210);

the first branch pipe (130) and the second branch pipe (140) are communicated with the air inlet pipe (120), the first branch pipe (130) is communicated with each drying tower (110), and the second branch pipe (140) is communicated with each drying tower (110) through the cold blowing air inlet pipe (180);

the heat exchanger (150) is provided with a first medium inlet and a first medium outlet which are communicated with each other, and a second medium inlet and a second medium outlet which are communicated with each other, the cold blowing gas outlet pipe (190) is respectively communicated with each drying tower (110) and the first medium inlet, the hot blowing gas inlet pipe (210) is respectively communicated with the first medium outlet and each drying tower (110), and the hot blowing gas outlet pipe (220) is respectively communicated with each drying tower (110) and the second medium inlet.

2. A dewatering apparatus according to claim 1, characterized in that the dewatering apparatus further comprises a return pipe (230), the return pipe (230) communicating with the second medium outlet and the first branch pipe (130), respectively.

3. The dewatering apparatus according to claim 2, characterized in that the first branch pipe (130) is provided with a flow regulating valve (240), the second branch pipe (140) is provided with a flow detecting member (250), and the flow regulating valve (240) is electrically connected with the flow detecting member (250).

4. A dewatering apparatus according to claim 3, characterized in that the connection of the return pipe (230) to the first branch pipe (130) is between the flow regulating valve (240) and each of the drying towers (110).

5. A dewatering apparatus according to claim 2, characterized in that the return pipe (230) is provided with a cooler (260).

6. A dewatering apparatus according to claim 5, characterized in that the return conduit (230) is further provided with a separator (270), the separator (270) being located downstream of the cooler (260).

7. The dehydration apparatus according to claim 1, further comprising a gas duct (280), wherein one end of the gas duct (280) is communicated with the cold-blowing gas outlet pipe (190), the other end of the gas duct (280) is communicated with the hot-blowing gas inlet pipe (210), the connection between the gas duct (280) and the hot-blowing gas inlet pipe (210) is located between the heater (160) and the heat exchanger (150), and the gas duct (280) is switchable between an on-state and an off-state.

8. The dewatering apparatus according to claim 1, wherein the drying towers (110) are provided with first and second communication ports, the first branch pipe (130), the cold aeration air inlet pipe (180) and the hot aeration air outlet pipe (220) are all communicated with the first communication port of each drying tower (110), and the drying air outlet pipe (170), the cold aeration air outlet pipe (190) and the hot aeration air inlet pipe (210) are all communicated with the second communication port of each drying tower (110).

9. The dehydration apparatus of claim 1, further comprising a conduction oil inflow pipe (310) and a conduction oil outflow pipe (320), wherein the heater (160) is provided with a gas channel, a conduction oil inlet, and a conduction oil outlet, the gas channel is communicated with the hot blow gas inlet pipe (210), the conduction oil inflow pipe (310) is communicated with the conduction oil inlet, and the conduction oil outflow pipe (320) is communicated with the conduction oil outlet.

10. A dewatering apparatus according to claim 1, characterized in that the number of drying towers (110) is three.