CN111359382A

CN111359382A - Tail gas drying system

Info

Publication number: CN111359382A
Application number: CN202010209143.9A
Authority: CN
Inventors: 钟浩; 周利兵; 边池旭
Original assignee: Atlas Copco Wuxi Compressor Co Ltd
Current assignee: Atlas Copco Wuxi Compressor Co Ltd
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2020-07-03

Abstract

The invention discloses a tail gas drying system, which comprises: the tail gas drying system comprises a first hot blowing flow path and a second hot blowing flow path, and the control valve assembly controls the on-off condition of each flow path in the first hot blowing flow path and the second hot blowing flow path, wherein when the control valve assembly controls the on-off condition of the second hot blowing flow path, airflow of the air inlet port can flow through the heater, then flow through the second drying tower, then flow through the cooler, then flow through the first drying tower, and then flow to the exhaust port, and when the control valve assembly controls the on condition of the first hot blowing flow path, airflow of the air inlet port can flow through the heater, then flow through the first drying tower, then flow through the cooler, then flow through the second drying tower, and then flow to the exhaust port. According to the tail gas drying system, the alternating adsorption drying and hot blowing regeneration of the first drying tower and the second drying tower can be realized without gas consumption, and the energy-saving effect is obvious.

Description

Tail gas drying system

Technical Field

The invention relates to the technical field of tail gas drying systems, in particular to a tail gas drying system.

Background

In the tail gas drying system in the related art, dry gas needs to be consumed to carry out regeneration treatment on the drying tower, and the operation mode has high energy consumption and low efficiency.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a tail gas drying system which can realize the alternate adsorption drying and hot blowing regeneration of a first drying tower and a second drying tower without gas consumption, and has an obvious energy-saving effect.

According to the embodiment of the invention, the tail gas drying system comprises: the tail gas drying system is provided with a first hot blowing flow path and a second hot blowing flow path, and the control valve assembly controls the on-off condition of each flow path in the first hot blowing flow path and the second hot blowing flow path, wherein when the control valve assembly controls the on-off condition of the second hot blowing flow path, the air flow of the air inlet port can firstly flow through the heater, then flow through the second drying tower, then flow through the cooler, then flow through the first drying tower, and then flow to the exhaust port; when the control valve assembly controls the first hot blow flow path to be connected, the air flow of the air inlet port may flow through the heater, then flow through the first drying tower, then flow through the cooler, then flow through the second drying tower, and then flow to the air outlet port.

According to the tail gas drying system provided by the embodiment of the invention, the alternate adsorption drying and hot blowing regeneration of the first drying tower and the second drying tower can be realized without gas consumption, and the energy-saving effect is obvious.

In some embodiments, the tail gas drying system comprises: a first common line used between the heater of the second hot blow flow path and the second drying tower, the first common line also being used between the heater of the first hot blow flow path and the first drying tower; the first temperature detection device is arranged on the first shared pipeline; the second common pipeline is used between the second drying tower and the cooler of the second hot blowing flow path, the second common pipeline is also used between the first drying tower and the cooler of the first hot blowing flow path, and the second temperature detection device is arranged on the second common pipeline.

In some embodiments, the exhaust gas drying system has a first cold blowing flow path and a second cold blowing flow path, the control valve assembly controls on/off of each of the first cold blowing flow path and the second cold blowing flow path, and when the control valve assembly controls on of the second cold blowing flow path, the air flow of the air inlet port may flow through the second drying tower, then flow through the cooler, then flow through the first drying tower, and then flow to the air outlet port; when the control valve assembly controls the first cold blow flow path to be connected, the air flow of the air inlet port can firstly flow through the first drying tower, then flow through the cooler, then flow through the second drying tower, and then flow to the air outlet port.

In some embodiments, when the second hot blowing flow path is on, the airflow flows in a reverse direction through the second drying tower, and when the second cold blowing flow path is on, the airflow flows in a forward direction through the second drying tower; when the first hot blowing flow path is connected, the airflow reversely flows through the first drying tower, and when the first cold blowing flow path is connected, the airflow positively flows through the first drying tower.

In some embodiments, the tail gas drying system is configured to: adjusting the gas flow rate flowing through the first drying tower in the first cold blowing flow path according to the gas flow rate flowing through the first drying tower in the first hot blowing flow path; and adjusting the gas flow rate flowing through the second drying tower in the second cold blowing flow path according to the gas flow rate flowing through the second drying tower in the second hot blowing flow path.

In some embodiments, the exhaust gas drying system has a first pressure regulating flow path and a second pressure regulating flow path, the control valve assembly controls the on/off of each of the first pressure regulating flow path and the second pressure regulating flow path, and when the control valve assembly controls the on of the first pressure regulating flow path, the air flow of the exhaust port can flow into the second drying tower; when the control valve assembly controls the second pressure regulating flow path to be connected, the air flow of the exhaust port can flow into the first drying tower.

In some embodiments, the tail gas drying system has a first drying flow path and a second drying flow path, the control valve assembly controls on and off of the first drying flow path and the second drying flow path, when the control valve assembly controls the first drying flow path to be switched on, the gas flow at the inlet of the first drying flow path may flow through the first drying tower first and then flow to the exhaust port, and the first drying flow path is a part of flow path shared by the second hot blowing flow path and the second cold blowing flow path; when the control valve assembly controls the second drying flow path to be connected, the airflow at the inlet of the second drying flow path may flow through the second drying tower first and then flow to the exhaust port, and the second drying flow path is a part of flow path shared by the first hot blowing flow path and the first cold blowing flow path.

In some embodiments, the tail gas drying system has a flow control flow path and a pre-cooling flow path, and the control valve assembly controls the on-off of each of the flow control flow path and the pre-cooling flow path, wherein when the control valve assembly controls the flow control flow path to be switched on, the gas flow of the gas inlet port can flow to the inlet of the first drying flow path and the inlet of the second drying flow path, and the control valve assembly includes a proportional valve arranged on the flow control flow path; when the control valve assembly controls the pre-cooling flow path to be switched on, the gas flow of the gas inlet port can firstly flow through the cooler and then flow to the inlet of the first drying flow path and the inlet of the second drying flow path.

In some embodiments, the tail gas drying system comprises: an inlet duct communicating upstream of the inlet port; and the first gas-liquid separator is arranged on the inlet pipeline.

In some embodiments, the tail gas drying system comprises: a second gas-liquid separator disposed downstream of the cooler.

In some embodiments, the tail gas drying system comprises: an outlet line communicating downstream of the exhaust port; and the dew point detector is arranged on the outlet pipeline.

In some embodiments, the heater is a steam heater.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic diagram of an exhaust drying system according to one embodiment of the present invention;

FIG. 2 is a gas flow diagram of a first step carried out by the tail gas drying system shown in FIG. 1;

FIG. 3 is a gas flow diagram of a second step performed by the tail gas drying system shown in FIG. 1;

FIG. 4 is a gas flow diagram of a third step performed by the tail gas drying system shown in FIG. 1;

FIG. 5 is a gas flow diagram of the exhaust drying system shown in FIG. 1 performing a fourth step;

FIG. 6 is a gas flow diagram of the fifth step performed by the tail gas drying system shown in FIG. 1;

FIG. 7 is a gas flow diagram of the exhaust drying system shown in FIG. 1 performing a sixth step;

FIG. 8 is a gas flow diagram of the exhaust drying system shown in FIG. 1 performing a seventh step;

fig. 9 is a gas flow diagram of the exhaust gas drying system shown in fig. 1 performing an eighth step.

Reference numerals:

a tail gas drying system 100; an air inlet port 1; an exhaust port 2; a heater 3; a cooler 4; a first drying tower 5; a second drying tower 6; a first common line 7; a second common line 8; a first temperature detection device 9; a second temperature detection device 10; a second gas-liquid separator 11; an inlet line 12; a first gas-liquid separator 13; an outlet line 14; a dew point detector 15; a first conduit 16; a first A end 16A; a first B terminal 16B; a second pipe 17; a third conduit 18; a fourth line 19; a fifth pipeline 20; a sixth pipeline 21; a seventh pipe 22; an eighth conduit 23; a second A end 23A; a second B terminal 23B; a ninth conduit 24; a tenth line 25; an eleventh line 26; a twelfth line 27; a thirteenth line 28; a third A end 28A; a third B terminal 28B; a fourteenth line 29; a fifteenth pipe 30; a sixteenth pipe 31; a seventeenth pipe 32; a flow meter 33; the third temperature detection device 34; a fourth temperature detection device 35; a fifth temperature detection device 36; a proportional valve 37; a first control valve V1; a second control valve V2; a third control valve V3; a fourth control valve V4; a fifth control valve V5; the sixth control valve V6; the seventh control valve V7; the eighth control valve V8; a ninth control valve V9; the tenth control valve V10; the eleventh control valve V11; a twelfth control valve V12; a thirteenth control valve V13; a fourteenth control valve V14; the first hot blow flow path R1; the second hot blow flow path R2; the first cold blow flow path L1; the second cold blow flow path L2; pre-cooling flow path S1; a flow control path K1; a first pressure-regulating flow path T1; a second pressure-regulating flow path T2; the first drying flow path D1; the second drying flow path D2.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.

Next, with reference to the drawings, an exhaust gas drying system 100 according to an embodiment of the present invention is described.

As shown in fig. 1, an exhaust gas drying system 100 according to an embodiment of the present invention may include: the exhaust gas drying system 100 includes a first hot blow flow path R1 (see fig. 7) and a second hot blow flow path R2 (see fig. 3), and a control valve assembly that controls the on/off state of each of the first hot blow flow path R1 and the second hot blow flow path R2.

As shown in fig. 3, when the control valve assembly controls the second hot blow flow path R2 to be turned on, the air flow of the inlet port 1 may flow through the heater 3, then through the second drying tower 6, then through the cooler 4, then through the first drying tower 5, and then to the outlet port 2. Therefore, hot blowing regeneration of the second drying tower 6 can be realized, the second drying tower 6 is dehydrated, and the airflow for hot blowing regeneration treatment of the second drying tower 6 is cooled by the cooler 4 and can be adsorbed and dried by the first drying tower 5, so that waste of air consumption is avoided. In other words, the air flow which should be dried is heated by the heater 3 to perform the hot blowing regeneration on the second drying tower 6, and then is cooled by the cooler 4 and enters the first drying tower 5 for adsorption drying, so as to realize the non-gas consumption hot blowing regeneration treatment.

As shown in fig. 7, when the control valve assembly controls the first hot blow flow path R1 to be turned on, the air flow of the inlet port 1 may flow through the heater 3, then flow through the first drying tower 5, then flow through the cooler 4, then flow through the second drying tower 6, and then flow to the outlet port 2. Therefore, hot blowing regeneration of the first drying tower 5 can be realized, the first drying tower 5 is dehydrated, and the airflow for hot blowing regeneration treatment of the first drying tower 5 is cooled by the cooler 4 and can be adsorbed and dried by the second drying tower 6, so that waste of air consumption is avoided. In other words, the air flow which should be dried is heated by the heater 3 to perform the hot blowing regeneration on the first drying tower 5, and then is cooled by the cooler 4 and enters the second drying tower 6 for adsorption drying, so as to realize the non-gas consumption hot blowing regeneration treatment.

In addition, because the tail gas drying system 100 comprises the first drying tower 5 and the second drying tower 6, the second drying tower 6 can be dehydrated by utilizing all or part of the airflow to perform hot blowing regeneration on the second drying tower 6 while the airflow is subjected to adsorption drying by utilizing the first drying tower 5, and similarly, the first drying tower 5 can be dehydrated by utilizing all or part of the airflow to perform hot blowing regeneration on the first drying tower 5 while the airflow is subjected to adsorption drying by utilizing the second drying tower 6, so that the first drying tower 5 and the second drying tower 6 can be alternately subjected to adsorption drying and hot blowing regeneration, the tail gas drying system 100 can continuously operate without gas consumption, the energy-saving effect is obvious, and the pollution to the atmosphere can be reduced by the gas-consumption-free operation for some polluted petrochemical enterprises.

In some embodiments of the present invention, as shown in fig. 3 and 7, the tail gas drying system 100 may include: a first common line 7, a second common line 8, a first temperature detecting device 9, and a second temperature detecting device 10, as shown in fig. 3, the first common line 7 is used between the heater 3 and the second drying tower 6 of the second hot blow flow path R2, as shown in fig. 7, the first common line 7 is also used between the heater 3 and the first drying tower 5 of the first hot blow flow path R1, as shown in fig. 3, the second common line 8 is used between the second drying tower 6 and the cooler 4 of the second hot blow flow path R2, as shown in fig. 7, the second common line 8 is also used between the first drying tower 5 and the cooler 4 of the first hot blow flow path R1, the first temperature detecting device 9 is provided on the first common line 7, and the second temperature detecting device 10 is provided on the second common line 8.

Thus, as shown in fig. 3, in the process of performing the hot blowing regeneration on the second drying tower 6 by using the second hot blowing flow path R2, the first temperature detection device 9 on the first common line 7 and the second temperature detection device 10 on the second common line 8 can detect the temperature of the air flow entering the second drying tower 6 and the temperature of the air flow exiting the second drying tower 6, respectively, so that the dehydration degree of the second drying tower 6 can be determined and known, thereby improving the reliability and effectiveness of the hot blowing regeneration on the second drying tower 6.

As shown in fig. 7, in the process of performing the hot blowing regeneration on the first drying tower 5 by using the first hot blowing flow path R1, the first temperature detection device 9 on the first common pipeline 7 and the second temperature detection device 10 on the second common pipeline 8 can respectively detect the temperature of the air flow entering the first drying tower 5 and the temperature of the air flow exiting the first drying tower 5, so that the dehydration degree of the first drying tower 5 can be judged and known, and the reliability and effectiveness of performing the hot blowing regeneration on the first drying tower 5 can be improved.

In addition, the first hot blowing flow path R1 and the second hot blowing flow path R2 share the first common line 7 and the second common line 8, and share the first temperature detection device 9 and the second temperature detection device 10, so that the exhaust gas drying system 100 can be simplified, the investment cost can be reduced, the structural compactness of the exhaust gas drying system 100 can be improved, and the installation space occupation of the exhaust gas drying system 100 can be reduced.

In some embodiments of the present invention, as shown in fig. 4 and 8, the exhaust gas drying system 100 has a first cold blow flow path L1 and a second cold blow flow path L2, and a control valve assembly controls the on/off of each of the first cold blow flow path L1 and the second cold blow flow path L2.

As shown in fig. 4, when the control valve assembly controls the second cold blow flow path L2 to be connected, the air flow of the air inlet port 1 may flow through the second drying tower 6, then flow through the cooler 4, then flow through the first drying tower 5, and then flow to the air outlet port 2, thereby implementing cold blow regeneration of the second drying tower 6, and reducing the temperature of the second drying tower 6 to be suitable for drying the air flow. Furthermore, the air flow regenerated by cold blowing to the second drying tower 6 can be absorbed and dried by the first drying tower 5 after being cooled by the cooler 4, thereby avoiding waste of air consumption. In other words, the air flow which is not dried can be directly used, the second drying tower 6 is firstly subjected to cold blowing regeneration, then the air flow is cooled by the cooler 4 and enters the first drying tower 5 for adsorption drying, and the non-consumption cold blowing regeneration treatment is realized.

As shown in fig. 8, when the control valve assembly controls the first cold blow flow path L1 to be turned on, the air flow of the inlet port 1 may flow through the first drying tower 5, then flow through the cooler 4, then flow through the second drying tower 6, and then flow to the outlet port 2. Therefore, the temperature of the first drying tower 5 can be reduced by cold blowing, and the temperature of the first drying tower 5 can be reduced to be suitable for drying airflow. Furthermore, the air flow regenerated by cold blowing to the first drying tower 5 can be absorbed and dried by the second drying tower 6 after being cooled by the cooler 4, thereby avoiding waste of air consumption. In other words, the air flow which is not dried can be directly used, the first drying tower 5 is firstly subjected to cold blowing regeneration, then the air flow is cooled by the cooler 4 and enters the second drying tower 6 for adsorption drying, and the non-consumption cold blowing regeneration treatment is realized.

In some embodiments of the present invention, as shown in fig. 3, when the second hot blowing flow path R2 is turned on, the airflow reversely flows through the second drying tower 6 (that is, the airflow enters from the outlet and exits from the inlet of the second drying tower 6), as shown in fig. 4, when the second cold blowing flow path L2 is turned on, the airflow normally flows through the second drying tower 6 (that is, the airflow enters from the inlet and exits from the outlet of the second drying tower 6), as shown in fig. 7, when the first hot blowing flow path R1 is turned on, the airflow reversely flows through the first drying tower 5 (that is, the airflow enters from the outlet and exits from the inlet of the first drying tower 5), as shown in fig. 8, when the first cold blowing flow path L1 is turned on, the airflow normally flows through the first drying tower 5 (that is, the airflow enters from the inlet and exits from the outlet of the first drying tower 5).

Therefore, the first hot blowing flow path R1, the first cold blowing flow path L1, the second hot blowing flow path R2 and the second cold blowing flow path L2 can share a common pipeline, so that the exhaust gas drying system 100 can be simplified, the investment cost can be reduced, the structural compactness of the exhaust gas drying system 100 can be improved, and the installation space occupation of the exhaust gas drying system 100 can be reduced. It should be noted that whether the air flow is hot-blown or cold-blown to the drying tower (including the first drying tower 5 and the second drying tower 6) depends on the temperature of the air flow entering the drying tower, and not on the forward direction or reverse direction entering the drying tower, which depends on the pipeline connection of the exhaust gas drying system 100. Therefore, the present invention is not limited to the flow direction of the air flow mentioned above, that is, when the exhaust gas drying system 100 employs enough pipes, the air flow can be positively introduced into the drying tower regardless of whether the air flow is hot blowing or cold blowing, and any two flow paths may not share a pipe.

In some embodiments of the present invention, the tail gas drying system 100 is configured to: the flow rate of the gas flowing through the first drying tower 5 in the first cold blow flow path L1 was adjusted in accordance with the flow rate of the gas flowing through the first drying tower 5 in the first hot blow flow path R1 (as shown in fig. 7 and 8), and the flow rate of the gas flowing through the second drying tower 6 in the second cold blow flow path L2 was adjusted in accordance with the flow rate of the gas flowing through the second drying tower 6 in the second hot blow flow path R2 (as shown in fig. 3 and 4). From this, can simply and guarantee effectively for the regenerated air current of cold blowing is enough to effectively cool down the regenerated drying tower of hot blowing, guarantees whole regeneration effect. It should be noted that, in order to implement the above control, the flow rate detection device (such as the flow meter 33 described later) and the flow rate control device (such as the proportional valve 37 described later) may be provided, and the positions of the flow rate detection device and the flow rate control device may be selected according to the specific pipeline connection of the exhaust gas drying system 100, which is not limited herein.

In some embodiments of the present invention, as shown in fig. 5 and 9, the exhaust gas drying system 100 has a first pressure regulating flow path T1 and a second pressure regulating flow path T2, and a control valve assembly controls the opening and closing of each of the first pressure regulating flow path T1 and the second pressure regulating flow path T2. As shown in fig. 5, when the control valve assembly controls the first pressure regulating flow path T1 to be turned on, the air flow of the exhaust port 2 may flow into the second drying tower 6, and thus, after the cold blowing regeneration is performed on the second drying tower 6, the pressure of the second drying tower 6 may be regulated by the dried air flow, so that the pressures of the second drying tower 6 and the first drying tower 5 are balanced, and the switching between the two drying towers may be performed later. As shown in fig. 9, when the control valve assembly controls the second pressure regulating flow path T2 to be turned on, the air flow of the exhaust port 2 may flow into the first drying tower 5, and thus, after the cold blowing regeneration is performed on the first drying tower 5, the pressure of the first drying tower 5 and the pressure of the second drying tower 6 may be regulated by the dried air flow, so that the pressures of the first drying tower 5 and the second drying tower 6 may be balanced, and the two drying towers may be switched later.

In some embodiments of the present invention, the exhaust gas drying system 100 has a first drying flow path D1 and a second drying flow path D2, and a control valve assembly controls the on/off of each of the first drying flow path D1 and the second drying flow path D2. As shown in fig. 2, when the control valve assembly controls the first drying flow path D1 to be turned on, the air flow at the inlet of the first drying flow path D1 may flow through the first drying tower 5 first and then to the exhaust port 2, and when the control valve assembly controls the second drying flow path D2 to be turned on, the air flow at the inlet of the second drying flow path D2 may flow through the second drying tower 6 first and then to the exhaust port 2. Therefore, with reference to fig. 3 and 4, the first drying flow path D1 may be a partial flow path shared by the second hot-blowing flow path R2 and the second cold-blowing flow path L2, and with reference to fig. 7 and 8, the second drying flow path D2 may be a partial flow path shared by the first hot-blowing flow path R1 and the first cold-blowing flow path L1, so that the complexity of the exhaust gas drying system 100 may be reduced, the input cost of the exhaust gas drying system 100 may be reduced, the control difficulty of the exhaust gas drying system 100 may be reduced, and the operational reliability of the exhaust gas drying system 100 may be improved.

In some embodiments of the present invention, as shown in fig. 2, the tail gas drying system 100 has a flow control flow path K1 and a pre-cooling flow path S1, and a control valve assembly controls the on/off of each of the flow control flow path K1 and the pre-cooling flow path S1, and the control valve assembly includes a proportional valve 37 disposed on the flow control flow path K1. As shown in fig. 2, when the control valve assembly controls the control flow path K1 to be turned on, the air flow of the air inlet port 1 may flow to the inlet of the first drying flow path D1 and the inlet of the second drying flow path D2, and when the control valve assembly controls the pre-cooling flow path S1 to be turned on, the air flow of the air inlet port 1 may flow through the cooler 4 first and then flow to the inlet of the first drying flow path D1 and the inlet of the second drying flow path D2.

Accordingly, the two flow paths of the controlled flow path K1 and the pre-cooling flow path S1 can be used to supply air to the first drying flow path D1 and the second drying flow path D2, respectively, and the air flow ratio distributed from the air inlet port 1 to the controlled flow path K1 and the pre-cooling flow path S1 can be adjusted by controlling the proportional valve 37, thereby simplifying the exhaust gas drying system 100 and facilitating control. In addition, when the gas stream is cooled by the cooler 4 through the pre-cooling flow path S1, and then enters the first drying tower 5 and/or the second drying tower 6, the adsorption drying effect on the gas stream can be improved.

In some embodiments of the present invention, as shown in fig. 1, the tail gas drying system 100 may include: an inlet pipe 12 and a first gas-liquid separator 13, the inlet pipe 12 communicating upstream of the intake port 1, the first gas-liquid separator 13 being provided in the inlet pipe 12. Thereby, the air flow can be filtered in advance by the first gas-liquid separator 13 before flowing to the air intake port 1, so that the drying effect can be further improved, and the drying use time of the first drying tower 5 and the second drying tower 6 in one cycle can be improved.

In some embodiments of the present invention, as shown in fig. 1, the tail gas drying system 100 may include: and a second gas-liquid separator 11, the second gas-liquid separator 11 being provided downstream of the cooler 4. Therefore, since the gas flow is likely to be separated out of liquid after passing through the cooler 4, the gas flow can be filtered by the second gas-liquid separator 11 in advance after flowing out of the cooler 4 and then flows to the first drying tower 5 and/or the second drying tower 6, so that the drying effect can be further improved, and the drying service time of the first drying tower 5 and the second drying tower 6 in one cycle can be increased.

In some embodiments of the present invention, the tail gas drying system 100 may include: an outlet line 14 and a dew point detector 15, the outlet line 14 communicating downstream of the exhaust port 2, the dew point detector 15 being provided on the outlet line 14. Therefore, the air flow drying degree can be judged and known according to the dew point detector 15, and the reliability of the drying process control is improved.

In some embodiments of the present invention, the heater 3 may be a steam heater, that is, steam may be caused to flow through the heater 3, and the temperature of the steam may be used to heat the airflow flowing through the heater 3. It will be appreciated that the gas flow through the heater 3 and the steam flow through the heater 3 are in two separate flow paths which are isolated from each other and which are capable of transferring heat to each other. Therefore, the gas flow can be heated more energy-saving and with reduced cost, and the stability of the dew point of the finally dried gas is ensured. Moreover, the steam is generally the exhaust gas of the user of the exhaust gas drying system 100, and can be recycled, thereby further reducing the use cost. Of course, the present invention is not limited thereto, and in other embodiments of the present invention, the heater 3 may also be an electric heater or the like. In an embodiment of the present invention, the control valve assembly may include a fourteenth control valve V14 controlling whether the heating gas enters or exits the heater 3.

In some embodiments of the present invention, the work flow of the tail gas drying system 100 may be as follows:

the first step is as follows: as shown in fig. 2, the tail gas to be dried is divided into two paths after passing through the first gas-liquid separator 13, one path of the tail gas enters the first drying flow path D1 and the second drying flow path D2 through the flow control flow path K1, and is adsorbed by the first drying tower 5 and the second drying tower 6; the other is cooled by the cooler 4 through the pre-cooling flow path S1, and then enters the first drying flow path D1 and the second drying flow path D2, and is adsorbed by the first drying tower 5 and the second drying tower 6. Or, the gas divided into two paths after passing through the first gas-liquid separator 13 passes through the flow control path K1 and the pre-cooling path S1, and then joins the first drying path D1 and the second drying path D2, and is adsorbed by the first drying tower 5 and the second drying tower 6.

Therefore, through the first step, the main pipeline of the tail gas drying system 100 can be blown through by the tail gas, so that air and other gases are prevented from remaining in the main pipeline, and the tail gas to be dried can flow through the tail gas drying system 100 more stably in the subsequent process.

The first step may be ended by time control, that is, the first step may be ended after a predetermined time period is performed, so as to facilitate control, but the present invention is not limited thereto, and whether the first step should be ended may also be determined by detecting a gas parameter at a suitable position of the exhaust gas drying system 100. In addition, in the first step, the opening degree of the proportional valve 37 on the flow control flow path K1 may be controlled to be fully opened, so that enough gas enters the flow control flow path K1, thereby reducing the pressure loss of the client and improving the reliability and efficiency of the first step, although the invention is not limited thereto, and the opening degree of the proportional valve 37 may also be controlled according to the actual situation.

The second step is as follows: as shown in fig. 3, the tail gas to be dried is divided into two paths after passing through the first gas-liquid separator 13, one path enters the first drying flow path D1 through the flow control flow path K1, and is adsorbed by the first drying tower 5; the other path enters a second hot blowing flow path R2, is heated by a heater 3, enters a second drying tower 6, performs hot blowing regeneration on the second drying tower 6, is cooled by a cooler 4, and enters a first drying tower 5 for adsorption. It is understood that, when the first drying flow path D1 is a part of the second hot blowing flow path R2, the gas flow from the cooler 4 may be merged with the gas flow from the flow control flow path K1 and then flow together into the first drying tower 5 for adsorption.

Thus, through the second step, the hot-blowing regeneration treatment can be performed on the second drying tower 6, and the part of the gas flow for treatment can be adsorbed by the first drying tower 5, so that the tail gas drying system 100 has no gas consumption.

Wherein the second step may be ended by temperature detection and time control, for example, when the temperature detected by the second temperature detecting means 10 reaches 120 ℃, and the second step lasts for 90min at minimum and 210min at maximum, but the present invention is not limited thereto. In addition, in the second step, when the temperature detected by the first temperature detecting device 9 is higher than 300 ℃ or lower than 100 ℃, an alarm may be issued to indicate that the system is out of order, and non-stop maintenance may be implemented, for example, increasing or decreasing the opening degree of the regulating proportional valve 37, so as to ensure that the exhaust gas drying system 100 can reliably operate, but the invention is not limited thereto. Further, in the second step, the opening degree of the proportional valve 37 on the flow control flow path K1 may be controlled to be half open to allow enough gas to enter the second hot blow flow path R2, thereby improving the reliability and effectiveness of the hot blow regeneration of the second drying tower 6, although the invention is not limited thereto, and the opening degree of the proportional valve 37 may be controlled according to actual circumstances.

The third step: as shown in fig. 4, the tail gas to be dried is divided into two paths after passing through the first gas-liquid separator 13, one path enters the first drying flow path D1 through the flow control flow path K1, and is adsorbed by the first drying tower 5; the other path enters a second cold blowing flow path L2, enters a second drying tower 6 firstly, performs cold blowing regeneration on the second drying tower 6, is cooled by a cooler 4, and enters a first drying tower 5 for adsorption. It is understood that, when the first drying flow path D1 is a part of the second cold blowing flow path L2, the gas flow flowing out from the cooler 4 may be merged with the gas flow flowing out from the flow control flow path K1 and then flow together into the first drying tower 5 for adsorption.

Therefore, through the third step, the cold blowing regeneration treatment can be performed on the second drying tower 6, so that the temperature of the second drying tower 6 is reduced, the adsorption by the second drying tower 6 after the subsequent switching is facilitated, and the part of the airflow for treatment can be adsorbed by the first drying tower 5, so that the tail gas drying system 100 has no gas consumption.

Wherein the third step may be ended by temperature detection and time control, for example, when the temperature detected by the second temperature detecting means 10 reaches 60 ℃, and the third step lasts for 45min at minimum and 90min at maximum, but the present invention is not limited thereto. In addition, in the third step, the proportional valve 37 on the flow control flow path K1 can automatically adjust the opening degree according to the flow rate of the air flow for hot-blow regeneration in the second step, i.e. the flow rate of the air flow for hot-blow regeneration in the second step is larger, and the opening degree of the proportional valve 37 in the third step is smaller, so that the air flow of the second cold-blow flow path L2 is larger, whereas if the flow rate of the air flow for hot-blow regeneration in the second step is smaller, the opening degree of the proportional valve 37 in the third step is larger, so that the air flow of the second cold-blow flow path L2 is smaller, and the quicker, less efficient and meeting the cold-blow regeneration requirement are ensured. Further, the flow rate of the air flow for the hot blow regeneration in the second step may be detected by a flow meter 33 described later, but the present invention is not limited to this, and the opening degree of the proportional valve 37 may be controlled according to the actual situation.

The fourth step: as shown in fig. 5, the tail gas to be dried is divided into two paths after passing through the first gas-liquid separator 13, one path enters the first drying flow path D1 through the flow control flow path K1, and is adsorbed by the first drying tower 5; the other is cooled by the cooler 4 through the pre-cooling flow path S1, and then enters the first drying flow path D1 to be adsorbed by the first drying tower 5. Meanwhile, a part of the air flow at the exhaust port 2 enters the second drying tower 6 through the first pressure regulating flow path T1, so that the second drying tower 6 maintains a certain pressure for subsequent switching.

Therefore, through the fourth step, the pressure of the first drying tower 5 and the second drying tower 6 can be more even, the output dew point is more stable, and the first drying tower 5 and the second drying tower 6 can be reliably switched subsequently. Up to this point, the whole process of regeneration of the second drying tower 6 and adsorption by the first drying tower 5 is completed through the first to fourth steps.

Wherein the fourth step can be ended by dew point detection and time control, for example, when the dew point detector 15 of the outlet pipeline 14 detects that the dew point of the airflow is lower than-30 ℃, which indicates that the performance of the exhaust gas drying system 100 is better, the operation can be continued, and the maximum operation time of the step is 8 hours. In addition, in the fourth step, the opening degree of the proportional valve 37 on the flow control flow path K1 may be controlled to be fully opened, so that enough gas enters the flow control flow path K1, thereby reducing the pressure loss of the client and improving the reliability and efficiency of the fourth step, although the invention is not limited thereto, and the opening degree of the proportional valve 37 may also be controlled according to the actual situation.

The fifth step: as shown in fig. 6, the tail gas to be dried is divided into two paths after passing through the first gas-liquid separator 13, one path of the tail gas enters the first drying flow path D1 and the second drying flow path D2 through the flow control flow path K1, and is adsorbed by the first drying tower 5 and the second drying tower 6; the other is cooled by the cooler 4 through the pre-cooling flow path S1, and then enters the first drying flow path D1 and the second drying flow path D2, and is adsorbed by the first drying tower 5 and the second drying tower 6. Or, the gas divided into two paths after passing through the first gas-liquid separator 13 passes through the flow control path K1 and the pre-cooling path S1, and then joins the first drying path D1 and the second drying path D2, and is adsorbed by the first drying tower 5 and the second drying tower 6.

Therefore, through the fifth step, the main pipeline of the tail gas drying system 100 can be blown through by the tail gas, so that gas such as air is prevented from remaining in the main pipeline, and the tail gas to be dried can flow through the tail gas drying system 100 more stably in the subsequent process.

The fifth step may be ended by time control, that is, the fifth step may be ended after a predetermined time period is performed, so as to facilitate control, and of course, the present invention is not limited thereto, and whether the fifth step should be ended may also be determined by detecting a gas parameter at a suitable position of the exhaust gas drying system 100. In addition, in the fifth step, the opening degree of the proportional valve 37 on the flow control flow path K1 may be controlled to be fully opened, so that enough gas enters the flow control flow path K1, thereby reducing the gas pressure of the pre-cooling flow path S1 and improving the reliability and efficiency of the fifth step, although the invention is not limited thereto, and the opening degree of the proportional valve 37 may also be controlled according to actual situations.

A sixth step: as shown in fig. 7, the tail gas to be dried is divided into two paths after passing through the first gas-liquid separator 13, one path enters the second drying flow path D2 through the flow control flow path K1, and is adsorbed by the second drying tower 6; the other path enters a first hot blowing flow path R1, is heated by a heater 3, enters a first drying tower 5, performs hot blowing regeneration on the first drying tower 5, is cooled by a cooler 4, and enters a second drying tower 6 for adsorption. It is understood that, when the second drying flow path D2 is a part of the first hot blowing flow path R1, the gas flow from the cooler 4 may be merged with the gas flow from the flow control flow path K1 and then flow together into the second drying tower 6 for adsorption.

Thus, through the sixth step, the hot-blowing regeneration treatment can be performed on the first drying tower 5, and the part of the airflow for treatment can be adsorbed by the second drying tower 6, so that the tail gas drying system 100 has no gas consumption.

Wherein the sixth step may be ended by temperature detection and time control, for example, when the temperature detected by the second temperature detecting means 10 reaches 120 ℃, and the sixth step lasts for 90min at minimum and 210min at maximum, but the present invention is not limited thereto. In addition, in the sixth step, when the temperature detected by the first temperature detecting device 9 is higher than 300 ℃ or lower than 100 ℃, an alarm may be issued to indicate that the system is faulty, and non-stop maintenance may be implemented, for example, resetting a valve, etc., so as to ensure that the exhaust gas drying system 100 can reliably operate, but the present invention is not limited thereto. Further, in the sixth step, the opening degree of the proportional valve 37 on the flow control flow path K1 may be controlled to be half open to allow enough gas to enter the first hot blow flow path R1, thereby improving the reliability and effectiveness of the hot blow regeneration of the first drying tower 5, although the invention is not limited thereto, and the opening degree of the proportional valve 37 may be controlled according to actual circumstances.

A seventh step of: as shown in fig. 8, the tail gas to be dried is divided into two paths after passing through the first gas-liquid separator 13, one path enters the second drying flow path D2 through the flow control flow path K1, and is adsorbed by the second drying tower 6; the other path enters a first cold blowing flow path L1, enters a first drying tower 5 first, performs cold blowing regeneration on the first drying tower 5, is cooled by a cooler 4, and enters a second drying tower 6 for adsorption. It is understood that, when the second drying flow path D2 is a part of the first cold blowing flow path L1, the gas flow from the cooler 4 may be merged with the gas flow from the flow control flow path K1 and then flow together into the second drying tower 6 for adsorption.

Therefore, through the seventh step, the cold blowing regeneration treatment can be performed on the first drying tower 5, so that the temperature of the first drying tower 5 is reduced, the adsorption by the first drying tower 5 after the subsequent switching is facilitated, and the part of the airflow for treatment can be adsorbed by the second drying tower 6, so that the tail gas drying system 100 has no gas consumption.

Wherein the seventh step may be ended by temperature detection and time control, for example, when the temperature detected by the second temperature detecting means 10 reaches 60 ℃, and the seventh step lasts for 45min at minimum and 90min at maximum, but the present invention is not limited thereto. In addition, in the seventh step, the proportional valve 37 on the flow control flow path K1 can automatically adjust the opening degree according to the flow rate of the airflow for hot blow regeneration in the sixth step, that is, the flow rate of the airflow for hot blow regeneration in the sixth step is larger, the opening degree of the proportional valve 37 in the seventh step is smaller, so that the airflow of the first cold blow flow path L1 is larger, whereas if the flow rate of the airflow for hot blow regeneration in the sixth step is smaller, the opening degree of the proportional valve 37 in the seventh step is larger, so that the airflow of the first cold blow flow path L1 is smaller, so that the requirement of cold blow regeneration is met with faster efficiency and lower efficiency. The flow rate of the air flow for the hot blow regeneration in the sixth step may be detected by a flow meter 33 described later, but the present invention is not limited to this, and the opening degree of the proportional valve 37 may be controlled according to actual circumstances.

An eighth step: as shown in fig. 9, the tail gas to be dried is divided into two paths after passing through the first gas-liquid separator 13, and one path enters the second drying flow path D2 through the flow control flow path K1 and is adsorbed by the second drying tower 6; the other is cooled by the cooler 4 through the pre-cooling flow path S1, and then enters the second drying flow path D2 to be adsorbed by the second drying tower 6. Meanwhile, a part of the air flow at the exhaust port 2 enters the first drying tower 5 through the second pressure regulating flow path T2, so that the first drying tower 5 maintains a certain pressure for subsequent switching.

Therefore, through the eighth step, the pressure of the first drying tower 5 and the second drying tower 6 can be more even, the output dew point is more stable, and the first drying tower 5 and the second drying tower 6 can be reliably switched subsequently. Up to this point, the whole process of regeneration of the first drying tower 5 and adsorption by the second drying tower 6 is completed through the fifth to eighth steps.

Wherein the eighth step can be finished by dew point detection and time control, for example, when the dew point detector 15 of the outlet pipeline 14 detects that the dew point of the airflow is lower than-30 ℃, which indicates that the performance of the exhaust gas drying system 100 is better, the operation can be continued in this state, and the maximum operation time of this step is 8 hours. In addition, in the eighth step, the opening degree of the proportional valve 37 on the flow control flow path K1 may be controlled to be fully opened, so that enough gas enters the flow control flow path K1, thereby reducing the pressure loss of the client and improving the reliability and efficiency of the eighth step, although the invention is not limited thereto, and the opening degree of the proportional valve 37 may also be controlled according to the actual situation.

Thereafter, a loop operation from the first step to the eighth step may be performed, starting from the first step.

In some embodiments of the present invention, the heater 3 may be selectively turned on or off when the airflow passes through the heater 3, and the cooler 4 may be selectively turned on or off when the airflow passes through the cooler 4. Therefore, when the air flows enter the first and second hot blowing flow paths R1 and R2, the opening and closing of the heater 3 and the cooler 4 need to be controlled individually; when the gas flow enters the first cold blow flow path L1, the second cold blow flow path L2, and the pre-cooling flow path S1, the opening and closing of the cooler 4 need to be individually controlled.

Therefore, in the first step and the fifth step, when the gas flow passes through pre-cooling flow path S1, if cooler 4 is turned on, the temperature of the gas flow passing through pre-cooling flow path S1 may be lowered, and if cooler 4 is not turned on, the temperature of the gas flow passing through pre-cooling flow path S1 may not be lowered, and only functions to blow through the corresponding piping with the gas.

Of course, the present invention is not limited thereto, and in other embodiments of the present invention, the cooler 4 may be configured as a normally open cooler, that is, the cooler 4 is always in an open state as long as the exhaust gas drying system 100 is operated, so that the opening and closing actions of the control valve may be reduced.

In addition, it should be noted that the operation cycle of the drying system 100 is not limited to the eight steps, and for example, the fifth step may be omitted. Further, the eight steps are not limited to the above description, and for example, in the first step, the fourth step, the fifth step, and the eighth step, the gas flow may not flow through pre-cooling flow path S1. For example, in the second step, the third step, the sixth step, and the seventh step, the gas flow may not flow through the controlled flow path K1.

Referring now to the drawings, an exhaust drying system 100 according to an embodiment of the present invention will be described.

As shown in fig. 1, the tail gas drying system 100 includes: a first line 16, a second line 17, a third line 18, a fourth line 19, a fifth line 20, a sixth line 21, a seventh line 22, an eighth line 23, a ninth line 24, a tenth line 25, an eleventh line 26, a twelfth line 27, a thirteenth line 28, a fourteenth line 29, a fifteenth line 30, a sixteenth line 31, and a seventeenth line 32. The control valve assembly includes: a first control valve V1, a second control valve V2, a third control valve V3, a fourth control valve V4, a fifth control valve V5, a sixth control valve V6, a seventh control valve V7, an eighth control valve V8, a ninth control valve V9, a tenth control valve V10, an eleventh control valve V11, a twelfth control valve V12, a thirteenth control valve V13, and a fourteenth control valve V14.

As shown in fig. 1, one end of the second pipeline 17 is communicated with the air inlet port 1, the other end of the second pipeline 17 is communicated with the inlet of the heater 3, two ends of the first pipeline 16 are respectively a first a end 16A and a first B end 16B, one end of the fifth pipeline 20 is communicated with the air inlet port 1, the other end of the fifth pipeline 20 is communicated with the first a end 16A, a thirteenth control valve V13 is arranged on the fifth pipeline 20 to control the on-off of the fifth pipeline 20, one end of the twelfth pipeline 27 is communicated with the first a end 16A, the other end of the twelfth pipeline 27 is communicated with the outlet of the cooler 4, and the twelfth pipeline 27 is provided with a flow meter 33.

As shown in fig. 1, one end of the third pipeline 18 is communicated with the first B end 16B, the other end of the third pipeline 18 is communicated with the inlet of the first drying tower 5, and a first control valve V1 is provided on the third pipeline 18 to control the on/off of the third pipeline 18. One end of the fourth pipeline 19 is communicated with the first B end 16B, the other end of the fourth pipeline 19 is communicated with the inlet of the second drying tower 6, and the second control valve V2 is arranged on the fourth pipeline 19 to control the on-off of the fourth pipeline 19.

As shown in fig. 1, one end of the sixth pipeline 21 is communicated with the outlet of the first drying tower 5, the other end of the sixth pipeline 21 is communicated with the exhaust port 2, and a third control valve V3 is provided on the sixth pipeline 21 to control the on/off of the sixth pipeline 21. One end of the seventh pipeline 22 is communicated with the outlet of the second drying tower 6, the other end of the seventh pipeline 22 is communicated with the exhaust port 2, and the fourth control valve V4 is arranged on the seventh pipeline 22 to control the on-off of the seventh pipeline 22.

As shown in fig. 1, the thirteenth pipeline 28 has a third a end 28A and a third B end 28B at two ends, the third a end 28A is communicated with the inlet of the cooler 4, and a seventh control valve V7 is disposed on the thirteenth pipeline 28 to control the on/off of the thirteenth pipeline 28. One end of the ninth pipeline 24 intersects the fourth pipeline 19, and is located on one side of the second control valve V2 close to the inlet of the second drying tower 6 to communicate with the inlet of the second drying tower 6, the other end of the ninth pipeline 24 communicates with the third B end 28B, and the sixth control valve V6 is located on the ninth pipeline 24 to control the on-off of the ninth pipeline 24. One end of the tenth pipeline 25 intersects the third pipeline 18, and is located on one side of the first control valve V1 close to the inlet of the first drying tower 5 to communicate with the inlet of the first drying tower 5, the other end of the tenth pipeline 25 communicates with the third B end 28B, and the fifth control valve V5 is located on the tenth pipeline 25 to control the on-off of the tenth pipeline 25.

As shown in fig. 1, one end of an eleventh line 26 intersects the second line 17 to communicate with the intake port 1, the other end of the eleventh line 26 intersects the thirteenth line 28 and is located on a side of the seventh control valve V7 away from the cooler 4, and an eighth control valve V8 is provided on the eleventh line 26 to control on/off of the eleventh line 26.

As shown in fig. 1, two ends of the eighth pipeline 23 are a second a end 23A and a second B end 23B, respectively, one end of the seventeenth pipeline 32 intersects with the sixth pipeline 21, and is located on one side of the third control valve V3 close to the outlet of the first drying tower 5 to communicate with the outlet of the first drying tower 5, the other end of the seventeenth pipeline 32 communicates with the second B end 23B, and the ninth control valve V9 is located on the seventeenth pipeline 32 to control on/off of the seventeenth pipeline 32.

As shown in fig. 1, one end of the fifteenth pipeline 30 intersects the seventh pipeline 22, and is located on one side of the fourth control valve V4 close to the outlet of the second drying tower 6 to communicate with the outlet of the second drying tower 6, the other end of the fifteenth pipeline 30 communicates with the second B end 23B, and the tenth control valve V10 is provided on the fifteenth pipeline 30 to control on/off of the fifteenth pipeline 30.

As shown in fig. 1, one end of the sixteenth pipeline 31 intersects the thirteenth pipeline 28 and communicates with the inlet of the cooler 4, the other end of the sixteenth pipeline 31 communicates with the second a end 23A, and the eleventh control valve V11 is disposed on the sixteenth pipeline 31 to control the on/off of the sixteenth pipeline 31. One end of the fourteenth pipeline 29 is communicated with the outlet of the heater 3, the other end of the fourteenth pipeline 29 is communicated with the second end A23A, the twelfth control valve V12 is arranged on the fourteenth pipeline 29 to control the on-off of the fourteenth pipeline 29, the fourteenth pipeline 29 is provided with a first temperature detection device 9, and the first temperature detection device 9 is positioned between the heater 3 and the twelfth control valve V12. A second temperature detection device 10 is arranged at the intersection of the thirteenth pipeline 28 and the sixteenth pipeline 31.

In addition, a third temperature detection device 34 may be further disposed at the air inlet port 1, a fifth temperature detection device 36 may be further disposed on the twelfth pipeline 27, a fourth temperature detection device 35 may be further disposed at the exhaust port 2, and the like, so that better monitoring and control of the exhaust gas drying system 100 may be achieved. In addition, it should be noted that the temperature detection device according to the embodiment of the present invention may be a temperature transmitter, and may implement transmission of monitoring information.

In the exhaust gas drying system 100 of the present embodiment, as shown in fig. 3, the second line 17, the fourteenth line 29, the eighth line 23, the fifteenth line 30, the fourth line 19, the ninth line 24, the thirteenth line 28, the twelfth line 27, the first line 16, the third line 18, and the sixth line 21 are used for the second hot blow flow path R2; as shown in fig. 4, the second line 17, the eleventh line 26, the thirteenth line 28, the ninth line 24, the fourth line 19, the seventh line 22, the fifteenth line 30, the eighth line 23, the sixteenth line 31, the thirteenth line 28, the twelfth line 27, the first line 16, the third line 18, and the sixth line 21 are used for the second cold blow flow path L2.

In the exhaust gas drying system 100 of the present embodiment, as shown in fig. 7, the second line 17, the fourteenth line 29, the eighth line 23, the seventeenth line 32, the sixth line 21, the third line 18, the tenth line 25, the thirteenth line 28, the twelfth line 27, the first line 16, the fourth line 19, and the seventh line 22 are used for the first hot blow flow path R1; as shown in fig. 8, the second line 17, the eleventh line 26, the thirteenth line 28, the tenth line 25, the third line 18, the sixth line 21, the seventeenth line 32, the eighth line 23, the sixteenth line 31, the twelfth line 27, the first line 16, the fourth line 19, and the seventh line 22 are used for the first cold blow flow path L1.

In the exhaust gas drying system 100 of the present embodiment, as shown in fig. 2, the fifth line 20 is used for the flow control flow path K1, and the thirteenth control valve V13 on the fifth line 20 is used as the proportional valve 37; the first line 16, the third line 18, and the sixth line 21 are for the first drying flow path D1; the first line 16, the fourth line 19 and the seventh line 22 are for the second drying flow path D2; second, eleventh, thirteenth, and

twelfth lines

17, 26, 28, 27 are for pre-cooling flow path S1; as shown in fig. 3 and 7, the fourteenth line 29 is the first common line 7, and the thirteenth line 28 is the second common line 8; as shown in fig. 5 and 9, the seventh conduit 22 is used for the first pressure-regulating flow passage T1; the sixth line 21 is used for the second pressure regulating flow path T2.

The working flow of the exhaust gas drying system 100 of the present embodiment to realize the above eight steps may be specifically as follows.

As shown in fig. 2, in the first step: the thirteenth control valve V13, the first control valve V1, the second control valve V2, the third control valve V3, the fourth control valve V4, the eighth control valve V8, and the seventh control valve V7 are opened, and the other control valves are closed. The tail gas to be dried flows into the inlet pipeline 12, and is divided into two paths after passing through the first gas-liquid separator 13, one path enters the fifth pipeline 20, and the other path enters the second pipeline 17, wherein the gas flow entering the fifth pipeline 20 directly flows to the first pipeline 16, the gas flow entering the second pipeline 17 sequentially passes through the eleventh pipeline 26 and the thirteenth pipeline 28, then flows into the cooler 4, and then flows into the first pipeline 16 through the twelfth pipeline 27. The airflow entering the first pipeline 16 respectively flows into a third pipeline 18 and a fourth pipeline 19, and the airflow flowing into the third pipeline 18 positively enters the first drying tower 5 for adsorption and then flows into the outlet pipeline 14 through a sixth pipeline 21; the gas flow flowing into the fourth line 19 is forwarded to the second drying tower 6 for adsorption and then flows into the outlet line 14 through the seventh line 22.

As shown in fig. 3, in the second step: the thirteenth control valve V13, the first control valve V1, the third control valve V3, the fourteenth control valve V14, the twelfth control valve V12, the tenth control valve V10, the sixth control valve V6, and the seventh control valve V7 are opened, and the other control valves are closed. The tail gas to be dried flows into the inlet pipeline 12, and is divided into two paths after passing through the first gas-liquid separator 13, one path enters the fifth pipeline 20, and the other path enters the second pipeline 17, wherein the gas flow entering the fifth pipeline 20 directly flows to the first pipeline 16. The air flow entering the second pipeline 17 firstly enters the heater 3 for heating, then reversely enters the second drying tower 6 for hot blowing through the fourteenth pipeline 29, the eighth pipeline 23, the fifteenth pipeline 30 and the seventh pipeline 22 in sequence, then enters the cooler 4 for cooling through the fourth pipeline 19, the ninth pipeline 24 and the thirteenth pipeline 28 in sequence, and then flows into the first pipeline 16 through the twelfth pipeline 27. The gas flow entering the first line 16 is positively fed to the first drying tower 5 through the third line 18 for adsorption and then flows into the outlet line 14 through the sixth line 21.

As shown in fig. 4, in the third step: the thirteenth control valve V13, the first control valve V1, the third control valve V3, the eighth control valve V8, the sixth control valve V6, the tenth control valve V10, and the eleventh control valve V11 are opened, and the other control valves are closed. The tail gas to be dried flows into the inlet pipeline 12, and is divided into two paths after passing through the first gas-liquid separator 13, one path enters the fifth pipeline 20, and the other path enters the second pipeline 17, wherein the gas flow entering the fifth pipeline 20 directly flows to the first pipeline 16. The air flow entering the second pipeline 17 passes through an eleventh pipeline 26, a thirteenth pipeline 28, a ninth pipeline 24 and a fourth pipeline 19 in sequence, enters the second drying tower 6 in the forward direction for cold blowing, then passes through a seventh pipeline 22, a fifteenth pipeline 30, an eighth pipeline 23 and a sixteenth pipeline 31 in sequence, enters the cooler 4 for cooling, and then flows into the first pipeline 16 through a twelfth pipeline 27. The gas flow entering the first line 16 is positively fed to the first drying tower 5 through the third line 18 for adsorption and then flows into the outlet line 14 through the sixth line 21.

As shown in fig. 5, in the fourth step: the thirteenth control valve V13, the first control valve V1, the third control valve V3, the eighth control valve V8, the seventh control valve V7, and the fourth control valve V4 are opened, and the other control valves are closed. The tail gas to be dried flows into the inlet pipeline 12, and is divided into two paths after passing through the first gas-liquid separator 13, one path enters the fifth pipeline 20, and the other path enters the second pipeline 17, wherein the gas flow entering the fifth pipeline 20 directly flows to the first pipeline 16, the gas flow entering the second pipeline 17 sequentially passes through the eleventh pipeline 26 and the thirteenth pipeline 28, then flows into the cooler 4, and then flows into the first pipeline 16 through the twelfth pipeline 27. The air flow entering the first pipeline 16 is positively fed into the first drying tower 5 through the third pipeline 18 for adsorption, and then flows into the outlet pipeline 14 and the seventh pipeline 22 through the sixth pipeline 21, the air flow flowing into the outlet pipeline 14 is detected by the dew point detector 15, and the air flow flowing into the seventh pipeline 22 is reversely fed into the second drying tower 6.

As shown in fig. 6, the fifth step is the same as the first step, i.e., the thirteenth control valve V13, the first control valve V1, the second control valve V2, the third control valve V3, the fourth control valve V4, the eighth control valve V8, and the seventh control valve V7 are opened, and the other control valves are closed. The tail gas to be dried flows into the inlet pipeline 12, and is divided into two paths after passing through the first gas-liquid separator 13, one path enters the fifth pipeline 20, and the other path enters the second pipeline 17, wherein the gas flow entering the fifth pipeline 20 directly flows to the first pipeline 16, the gas flow entering the second pipeline 17 sequentially passes through the eleventh pipeline 26 and the thirteenth pipeline 28, then flows into the cooler 4, and then flows into the first pipeline 16 through the twelfth pipeline 27. The airflow entering the first pipeline 16 respectively flows into a third pipeline 18 and a fourth pipeline 19, and the airflow flowing into the third pipeline 18 positively enters the first drying tower 5 for adsorption and then flows into the outlet pipeline 14 through a sixth pipeline 21; the gas flow flowing into the fourth line 19 is forwarded to the second drying tower 6 for adsorption and then flows into the outlet line 14 through the seventh line 22.

As shown in fig. 7, in the sixth step: the thirteenth control valve V13, the second control valve V2, the fourth control valve V4, the fourteenth control valve V14, the twelfth control valve V12, the ninth control valve V9, the fifth control valve V5, and the seventh control valve V7 are opened, and the other control valves are closed. The tail gas to be dried flows into the inlet pipeline 12, and is divided into two paths after passing through the first gas-liquid separator 13, one path enters the fifth pipeline 20, and the other path enters the second pipeline 17, wherein the gas flow entering the fifth pipeline 20 directly flows to the first pipeline 16. The air flow entering the second pipeline 17 firstly enters the heater 3 for heating, then reversely enters the first drying tower 5 for hot blowing through the fourteenth pipeline 29, the eighth pipeline 23, the seventeenth pipeline 32 and the sixth pipeline 21 in sequence, then enters the cooler 4 for cooling through the third pipeline 18, the tenth pipeline 25 and the thirteenth pipeline 28 in sequence, and then flows into the first pipeline 16 through the twelfth pipeline 27. The gas stream entering the first line 16 is forwarded to the second drying column 6 via a fourth line 19 for adsorption and then to the outlet line 14 via a seventh line 22.

As shown in fig. 8, in the seventh step: the thirteenth control valve V13, the second control valve V2, the fourth control valve V4, the eighth control valve V8, the fifth control valve V5, the ninth control valve V9, and the eleventh control valve V11 are opened, and the other control valves are closed. The tail gas to be dried flows into the inlet pipeline 12, and is divided into two paths after passing through the first gas-liquid separator 13, one path enters the fifth pipeline 20, and the other path enters the second pipeline 17, wherein the gas flow entering the fifth pipeline 20 directly flows to the first pipeline 16. The air flow entering the second pipeline 17 sequentially passes through an eleventh pipeline 26, a thirteenth pipeline 28, a tenth pipeline 25 and a third pipeline 18 and enters the first drying tower 5 in the forward direction for cold blowing, then sequentially passes through a sixth pipeline 21, a seventeenth pipeline 32, an eighth pipeline 23 and a sixteenth pipeline 31 and enters the cooler 4 for cooling, and then flows into the first pipeline 16 through a twelfth pipeline 27. The gas stream entering the first line 16 is forwarded to the second drying column 6 via a fourth line 19 for adsorption and then to the outlet line 14 via a seventh line 22.

As shown in fig. 9, in the eighth step: the thirteenth control valve V13, the second control valve V2, the fourth control valve V4, the eighth control valve V8, the seventh control valve V7, and the third control valve V3 are opened, and the other control valves are closed. The tail gas to be dried flows into the inlet pipeline 12, and is divided into two paths after passing through the first gas-liquid separator 13, one path enters the fifth pipeline 20, and the other path enters the second pipeline 17, wherein the gas flow entering the fifth pipeline 20 directly flows to the first pipeline 16, the gas flow entering the second pipeline 17 sequentially passes through the eleventh pipeline 26 and the thirteenth pipeline 28, then flows into the cooler 4, and then flows into the first pipeline 16 through the twelfth pipeline 27. The air flow entering the first pipeline 16 is positively fed into the second drying tower 6 through the fourth pipeline 19 for adsorption, and then flows into the outlet pipeline 14 and the sixth pipeline 21 through the seventh pipeline 22, the air flow flowing into the outlet pipeline 14 is detected by the dew point detector 15, and the air flow flowing into the sixth pipeline 21 is reversely fed into the first drying tower 5.

According to the tail gas drying system 100 provided by the embodiment of the invention, the test operation is stable, the energy-saving effect is outstanding, the dew point of the output gas is kept stable, the operation flow of the system is smooth, and the temperature and the pressure of the output tail gas are kept within normal ranges. The tail gas drying system 100 provided by the embodiment of the invention can be used for drying tail gas, the regeneration of the two drying towers can be realized by switching in the working process, the whole process has zero gas consumption and obvious energy-saving effect, and the pollution to the atmosphere can be reduced. One cycle period (from the first step to the eighth step) can be as long as 12 hours, the switching times and the switching noise of the control valve are reduced, and the service life of the control valve is prolonged.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An exhaust drying system, comprising: the tail gas drying system is provided with a first hot blowing flow path and a second hot blowing flow path, and the control valve assembly controls the on-off condition of each flow path in the first hot blowing flow path and the second hot blowing flow path, wherein,

when the control valve assembly controls the second hot blow flow path to be connected, the air flow of the air inlet port can firstly flow through the heater, then flow through the second drying tower, then flow through the cooler, then flow through the first drying tower and then flow to the air outlet port;

when the control valve assembly controls the first hot blow flow path to be connected, the air flow of the air inlet port may flow through the heater, then flow through the first drying tower, then flow through the cooler, then flow through the second drying tower, and then flow to the air outlet port.

2. The exhaust drying system of claim 1, comprising:

a first common line used between the heater of the second hot blow flow path and the second drying tower, the first common line also being used between the heater of the first hot blow flow path and the first drying tower;

the first temperature detection device is arranged on the first shared pipeline;

a second common line used between the second drying tower and the cooler of the second hot blow flow path, the second common line also being used between the first drying tower and the cooler of the first hot blow flow path,

and the second temperature detection device is arranged on the second shared pipeline.

3. The exhaust gas drying system according to claim 1, wherein the exhaust gas drying system has a first cold blow flow path and a second cold blow flow path, the control valve assembly controls the on/off of each of the first cold blow flow path and the second cold blow flow path,

when the control valve assembly controls the second cold blowing flow path to be connected, the air flow of the air inlet port can firstly flow through the second drying tower, then flow through the cooler, then flow through the first drying tower and then flow to the air outlet port;

when the control valve assembly controls the first cold blow flow path to be connected, the air flow of the air inlet port can firstly flow through the first drying tower, then flow through the cooler, then flow through the second drying tower, and then flow to the air outlet port.

4. The exhaust gas drying system according to claim 3,

when the second hot blowing flow path is connected, airflow reversely flows through the second drying tower, and when the second cold blowing flow path is connected, airflow positively flows through the second drying tower;

when the first hot blowing flow path is connected, the airflow reversely flows through the first drying tower, and when the first cold blowing flow path is connected, the airflow positively flows through the first drying tower.

5. The exhaust drying system of claim 3, wherein the exhaust drying system is configured to:

adjusting the gas flow rate flowing through the first drying tower in the first cold blowing flow path according to the gas flow rate flowing through the first drying tower in the first hot blowing flow path;

and adjusting the gas flow rate flowing through the second drying tower in the second cold blowing flow path according to the gas flow rate flowing through the second drying tower in the second hot blowing flow path.

6. The exhaust gas drying system according to claim 3, wherein the exhaust gas drying system has a first pressure-regulating flow path and a second pressure-regulating flow path, the control valve assembly controls the on/off of each of the first pressure-regulating flow path and the second pressure-regulating flow path,

when the control valve assembly controls the first pressure regulating flow path to be communicated, the air flow of the exhaust port can flow into the second drying tower;

when the control valve assembly controls the second pressure regulating flow path to be connected, the air flow of the exhaust port can flow into the first drying tower.

7. The exhaust gas drying system according to claim 3, wherein the exhaust gas drying system has a first drying flow path and a second drying flow path, the control valve assembly controls the on/off of the first drying flow path and the second drying flow path,

when the control valve assembly controls the first drying flow path to be connected, the air flow at the inlet of the first drying flow path can firstly flow through the first drying tower and then flow to the exhaust port, and the first drying flow path is a part of flow path shared by the second hot blowing flow path and the second cold blowing flow path;

when the control valve assembly controls the second drying flow path to be connected, the airflow at the inlet of the second drying flow path may flow through the second drying tower first and then flow to the exhaust port, and the second drying flow path is a part of flow path shared by the first hot blowing flow path and the first cold blowing flow path.

8. The exhaust drying system of claim 7, wherein the exhaust drying system has a flow control path and a pre-cooling path, and the control valve assembly controls the on/off status of each of the flow control path and the pre-cooling path, wherein,

when the control valve assembly controls the flow control flow path to be communicated, the air flow of the air inlet port can flow to the inlet of the first drying flow path and the inlet of the second drying flow path, and the control valve assembly comprises a proportional valve arranged on the flow control flow path;

when the control valve assembly controls the pre-cooling flow path to be switched on, the gas flow of the gas inlet port can firstly flow through the cooler and then flow to the inlet of the first drying flow path and the inlet of the second drying flow path.

9. The exhaust drying system of claim 1, comprising:

an inlet duct communicating upstream of the inlet port; and

the first gas-liquid separator is arranged on the inlet pipeline.

10. The exhaust drying system of claim 1, comprising:

a second gas-liquid separator disposed downstream of the cooler.

11. The exhaust drying system of claim 1, comprising:

an outlet line communicating downstream of the exhaust port; and

and the dew point detector is arranged on the outlet pipeline.

12. The exhaust drying system according to any of claims 1-11, wherein the heater is a steam heater.