CN209934403U - Three-tower pressure swing adsorption device for VOCs gas treatment - Google Patents

Abstract

The utility model discloses a three-tower pressure swing adsorption device for VOCs gas treatment, comprising a first adsorption tower, a second adsorption tower and a third adsorption tower, and the tops of the first adsorption tower, the second adsorption tower and the third adsorption tower The center of the air outlet pipe is fixedly connected with an air outlet pipe, the top of the three air outlet pipes is fixedly connected with a first connecting pipe, a first solenoid valve is fixedly connected on the surface of the air outlet pipe and near the top, and the center of the air outlet pipe is fixedly connected with a purge gas introduction The surface of the purging gas introduction pipe is fixedly sleeved with a third solenoid valve, one end of the three purging gas introduction pipes away from the gas outlet pipe is fixedly connected to the bottom of the exhaust pipe, and the first communication pipe is away from the bottom of the purge gas introduction pipe. One end is fixedly connected with a heating box; the utility model can regularly remove the organic matter remaining on the surface of the adsorbent, so that the adsorbent can be in the best working state for a long time, which makes up for the deficiency of the double-tower pressure swing adsorption technology and ensures the long-term exhaust gas discharge up to the standard.

Description

A three-tower pressure swing adsorption device based on VOCs gas treatment

technical field

The utility model relates to the technical field of waste treatment, in particular to a three-tower pressure swing adsorption device for VOCs gas treatment.

Background technique

The pressure swing adsorption unit is one of the feasible and effective processes in the combined process of purifying and discharging industrial VOCs exhaust gas and recycling effective substances in VOCs exhaust gas. Due to the complexity of the organic composition in the VOCs tail gas and the limitations of the equipment used in the pressure swing adsorption process, the conventional design adopts a double tower process, and one tower adsorbs and one tower desorbs during operation. According to the principle of adsorption and desorption, the difference in intermolecular force between the adsorbent and the adsorbate (such as CxHy components) under different pressures can realize the enrichment or desorption of the adsorbate on the adsorbent, so as to achieve the purpose of adsorption or desorption. , the removal of organic matter belongs to physical adsorption.

In the process of pressure swing desorption, with the extension of the use time of the adsorbent, the status of incomplete desorption will inevitably occur, resulting in the enrichment of organic matter on the surface of the adsorbent until the adsorbent fails, and at the same time, due to desorption Due to the limitations of the equipment itself, it is impossible to completely analyze the degree of organic matter enriched on the surface of the adsorbent during each desorption, and leave it in the adsorbent. For the VOCs tail gas discharged from the continuous operation of the production unit, if it is not regularly treated, it will remain in the adsorbent. The organic matter on the surface of the adsorbent, with the extension of the treatment time, the tail gas treatment device cannot meet the requirements of continuous and uninterrupted operation throughout the year.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a three-tower pressure swing adsorption device for VOCs gas treatment, which has the advantages of high purification efficiency and solves the problem of low use efficiency of the adsorbent.

The three-tower pressure swing adsorption device based on VOCs gas treatment of the present invention comprises a first adsorption tower, a second adsorption tower and a third adsorption tower, and the center of the top of the first adsorption tower, the second adsorption tower and the third adsorption tower Air outlet pipes are fixedly connected to each other, the tops of the three air outlet pipes are fixedly connected with a first connecting pipe, a first solenoid valve is fixedly connected to the surface of the air outlet pipes and close to the top, and a purge gas introduction pipe is fixedly connected to the center of the air outlet pipes. The surface of the purging gas introduction pipe is fixedly sleeved with a third solenoid valve, the ends of the three purging gas introduction pipes far away from the air outlet pipe are all fixed and connected to the bottom of the exhaust pipe, and the end of the first communication pipe away from the purge gas introduction pipe is fixed A heating box is connected, and the center of the left side of the top of the heating box is fixedly connected with an ammonia gas introduction pipe. The left side of the bottom of the first four-way pipe, the second four-way pipe and the third four-way pipe is fixedly connected with an exhaust gas outlet pipe, and the surface of the exhaust gas outlet pipe is fixedly connected with a fourth solenoid valve The center of the bottom of the first four-way pipe, the second four-way pipe and the third four-way pipe is fixedly connected with an exhaust gas introduction pipe, the surface of the exhaust gas introduction pipe is fixedly connected with a fifth solenoid valve, and the bottom of the three exhaust gas introduction pipes passes through the first four-way pipe. The three connecting pipes are connected to each other. The bottom right side of the first four-way pipe, the second four-way pipe and the third four-way pipe are all fixedly connected with a purge gas outlet pipe, and the surface of the purge gas outlet pipe is fixedly connected with a sixth The electromagnetic valve.

In the three-tower pressure swing adsorption device based on VOCs gas treatment of the utility model, a pressure balance pipe is fixedly connected between the three gas outlet pipes, and the left and right sides of the surface of the pressure balance pipe are fixedly connected with a second solenoid valve.

In the three-tower pressure swing adsorption device based on VOCs gas treatment of the present invention, the bottoms of the three tail gas outlet pipes are connected to each other through a second connection pipe, and the end of the second connection pipe away from the tail gas inlet pipe is fixedly connected with a vacuum pump.

In the three-tower pressure swing adsorption device based on VOCs gas treatment of the present invention, the bottoms of the three purge gas lead-out pipes are communicated with each other through a fourth connecting pipe, and one end of the fourth connecting pipe away from the purge gas lead-out pipe is sequentially fixedly connected with Induced fans and heat exchangers.

In the three-tower pressure swing adsorption device based on VOCs gas treatment of the utility model, the interior of the heating box is a hollow structure, and the left and right sides of the inner wall of the heating box and the top and bottom are fixedly connected with electric heaters.

In the three-tower pressure swing adsorption device based on VOCs gas treatment of the utility model, a heating pipe is fixedly connected to the inside of the heating box, and the left and right ends of the heating pipe are respectively connected with the ammonia gas introduction pipe and the first connecting pipe. The middle section of the heating tube is arranged in a spiral shape, and the surface of the heating tube is evenly and fixedly connected with a heat-conducting sheet.

Compared with the prior art, the beneficial effects of the present utility model are as follows:

1. The first adsorption tower, the second adsorption tower and the third adsorption tower of the present invention are automatically switched by the computer, and the entire system has a high degree of automation, and the main control key parameters and logic program control are randomly controlled by the computer to ensure processing effect. Through the set second connecting pipe and the fourth solenoid valve set on the exhaust gas outlet pipe, the device can realize the process flow of pressure swing adsorption between any two towers and the vacuum pump according to the needs, so as to ensure that the exhaust gas of the system can be discharged up to the standard. , through the heating box, the first connecting pipe, the purging gas outlet pipe and the sixth solenoid valve, so that the device can also connect any tower with the induced draft fan and the heat exchanger to realize the deheating process. The inner surface of the adsorbent in the adsorption tower is deeply desorbed, which can regularly remove the organic matter remaining on the surface of the adsorbent, so that the adsorbent can be in the best working condition for a long time, which makes up for the deficiency of the double-tower pressure swing adsorption technology and ensures long-term exhaust gas. Discharge.

2. The utility model has no waste water and waste gas discharged during the use process, and the VOCs gas continuously entering the device is processed by this process technology, and the organic matter is fully recovered, and the indicators of the discharged purified exhaust gas can be lower than the current national standards. At the same time, ensure the continuous operation of the system.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

Figure 1 is a schematic diagram of the overall structure;

Fig. 2 is a schematic diagram of the internal structure of the heating box;

Figure 3 is a schematic diagram of the workflow.

In the figure: 1, the first adsorption tower; 2, the second adsorption tower; 3, the third adsorption tower; 4, the gas outlet pipe; 41, the first solenoid valve; 5, the exhaust pipe; 6, the pressure balance pipe; 61, The second solenoid valve; 7. The purge gas inlet pipe; 71, The third solenoid valve; 8, The first connecting pipe; 9, The heating box; 91, The electric heater; 92, The heating pipe; Ammonia gas inlet pipe; 11, the first four-way pipe; 12, the exhaust gas outlet pipe; 121, the fourth solenoid valve; 13, the exhaust gas inlet pipe; 131, the fifth solenoid valve; 14, the purge gas outlet pipe; 141, the first Six solenoid valves; 15, the second four-way pipe; 16, the third four-way pipe; 17, the second connecting pipe; 171, the vacuum pump; 18, the third connecting pipe; 19, the fourth connecting pipe; 191, the induced draft fan; 192, heat exchanger.

Detailed ways

Several embodiments of the present invention will be disclosed in the following figures. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the purpose of simplifying the drawings, some well-known structures and components will be shown in a simple schematic manner in the drawings.

In addition, the descriptions such as “first”, “second”, etc. in the present invention are only for the purpose of description, and do not refer to the meaning of order or sequence, nor are they used to limit the present invention, which is only for the purpose of The components or operations described in the same technical terms are only distinguished, and should not be understood as indicating or implying their relative importance or implying the quantity of the indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present utility model.

The three-tower pressure swing adsorption device based on VOCs gas treatment of the present invention includes a first adsorption tower 1, a second adsorption tower 2 and a third adsorption tower 3, a first adsorption tower 1, a second adsorption tower 2 and a third adsorption tower 1. The center of the top of the adsorption tower 3 is fixedly connected with the gas outlet pipe 4, the top of the three gas outlet pipes 4 is fixedly connected with the first connecting pipe 8, and the surface of the gas outlet pipe 4 is fixedly connected with the first solenoid valve 41 at the position close to the top. A pressure balance pipe 6 is fixedly connected between the air pipes 4, the left and right sides of the surface of the pressure balance pipe 6 are fixedly connected with a second solenoid valve 61, and the center of the air outlet pipe 4 is fixedly connected with a purge gas introduction pipe 7, and the purge gas is introduced into The surface of the pipe 7 is fixedly sleeved with a third solenoid valve 71 , one end of the three purging gas introduction pipes 7 away from the gas outlet pipe 4 is fixedly connected to the bottom of the exhaust pipe 5 , and the first connecting pipe 8 is away from the purging gas introduction pipe 7 . One end is fixedly connected with a heating box 9, the center of the left side of the top of the heating box 9 is fixedly connected with an ammonia gas inlet pipe 10, and the centers of the tops of the first adsorption tower 1, the second adsorption tower 2 and the third adsorption tower 3 are fixedly connected with The first four-way pipe 11, the second four-way pipe 15 and the third four-way pipe 16, the left side of the bottom of the first four-way pipe 11, the second four-way pipe 15 and the third four-way pipe 16 are all fixedly connected with the exhaust gas. Outlet pipe 12, the bottoms of the three exhaust gas outlet pipes 12 are communicated with each other through a second connection pipe 17, one end of the second connection pipe 17 away from the exhaust gas inlet pipe 13 is fixedly connected with a vacuum pump 171, and the surface of the exhaust gas outlet pipe 12 is fixedly connected with a fourth electromagnetic The valve 121, the center of the bottom of the first four-way pipe 11, the second four-way pipe 15 and the third four-way pipe 16 are all fixedly connected with the exhaust gas introduction pipe 13, and the surface of the exhaust gas introduction pipe 13 is fixedly connected with the fifth solenoid valve 131, The bottoms of the three exhaust gas introduction pipes 13 are connected to each other through the third connecting pipe 18 , and the right side of the bottoms of the first four-way pipe 11 , the second four-way pipe 15 and the third four-way pipe 16 are fixedly connected with a purge gas outlet pipe 14 . , the surface of the purge gas outlet pipe 14 is fixedly connected with a sixth solenoid valve 141, the bottoms of the three purge gas outlet pipes 14 are connected to each other through a fourth connection pipe 19, and the fourth connection pipe 19 is far away from the purge gas outlet pipe 14. One end is fixedly connected with an induced draft fan 191 and a heat exchanger 192 in sequence.

The inside of the heating box 9 is a hollow structure, and the left and right sides and the top and bottom of the inner wall of the heating box 9 are fixedly connected with the electric heaters 91. This structure is arranged so that the electric heaters 91 inside the heating box 9 can face each other from four directions. The gas inside the heating tube 92 is heated, so that the gas is heated more uniformly.

The inside of the heating box 9 is fixedly connected with a heating pipe 92. The left and right ends of the heating pipe 92 are respectively communicated with the ammonia gas introduction pipe 10 and the first connecting pipe 8. The middle section of the heating pipe 92 is arranged in a spiral shape. The surface is evenly and fixedly connected with the heat-conducting sheet 93. The structure is arranged so that the gas can stay in the heating tube 92 for a longer time, and at the same time, it is also beneficial for the heat generated by the electric heater 91 to be transferred into the heating tube 92, which further improves the heating of the gas. rate.

Working principle: The utility model has three processing techniques, namely tail gas processing technique, desorption gas processing technique and adsorption tower purging technique;

Tail gas treatment process: when the VOCs tail gas from the external area reaches a certain pressure, the fifth solenoid valve 131 on the first adsorption tower 1 and the first solenoid valve 41 on the gas outlet pipe 4 at the top of the first adsorption tower 1 are opened, and the tail gas is introduced through the tail gas. The pipe 13 enters the first adsorption tower 1, and the fourth solenoid valve 121, the third solenoid valve 71, and the sixth solenoid valve 141 on the first adsorption tower 1 are closed. The organic matter is adsorbed by the adsorbent in the first adsorption tower 1 and left in the adsorbent, and the organic matter can be effectively separated under the adsorption pressure. It is discharged from the exhaust pipe 5, and the discharge reaches the standard on the spot, and the adsorption of the first adsorption tower 1 is completed;

The process of desorption gas treatment: the adsorbent is used for a period of time, and after adsorbing a certain amount of organic matter, the adsorbent should be regenerated. Five solenoid valves 131 and the first solenoid valve 41, then open the fourth solenoid valve 121 at the bottom of the first adsorption tower 1, start the vacuum pump 171, and the desorption gas is discharged and depressurized through the second connecting pipe 17, and the first adsorption tower 1 is subjected to Decompression and desorption, remove the organic matter in the equipment, desorb the gas to the lower section of the boundary for treatment, reduce the desorption pressure to about 10Pa, open the second solenoid valve 61, and adjust the pressure in the first adsorption tower 1 to a slightly positive pressure , and then close the second solenoid valve 61 .

When the desorption starts, the fifth solenoid valve 131 and the third solenoid valve 71 on the second adsorption tower 2 are opened at the same time, and the fourth solenoid valve 121, the first solenoid valve 41 and the sixth solenoid valve on the second adsorption tower 2 are closed. Valve 141, the second adsorption tower 2 enters the adsorption state;

Adsorption tower purging process: With the extension of the use time of the adsorbent, it is inevitable that some organic substances remain on the surface of the adsorbent, which will lead to the failure of the adsorbent in severe cases. Therefore, after a period of operation, the first adsorption tower 1, the second adsorption tower 2 and the third adsorption tower 3 must be treated to discharge the organic matter remaining in the adsorbent.

When the first adsorption tower 1 or the second adsorption tower 2 is performing adsorption or desorption work, the third adsorption tower 3 that has been working for a period of time is purged. First, the electric heater 91 is turned on to heat the nitrogen charged from the outside, and the heated nitrogen is sent to the third adsorption tower 3 through the first connecting pipe 8. At this time, the third electromagnetic valve 71 and the sixth electromagnetic valve of the third adsorption tower 3 are opened. Solenoid valve 141, turn on the induced draft fan 191, purge the third adsorption tower 3 from top to bottom, control the temperature between 120°C and 200°C, the organic matter is automatically extracted at high temperature, and is discharged out of the tower with nitrogen, and the purge gas is After the organic matter is cooled by cooling water in the heat exchanger 192, it is returned to the previous section for processing.

After a period of purging, the organic matter in the third adsorption tower 3 is completely removed, the electric heater 91 is turned off, and cold air is used to cool the third adsorption tower 3. When the temperature of the third adsorption tower 3 drops to normal temperature, the purging is stopped. , close the third solenoid valve 71, and stop the induced draft fan 191 and the heat exchanger 192.

The above descriptions are merely embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims (6)

1. The utility model provides a three tower pressure swing adsorption equipment based on VOCs gaseous processing usefulness which characterized in that: including first adsorption tower (1), second adsorption tower (2) and third adsorption tower (3), the equal fixedly connected with outlet duct (4) in central authorities at first adsorption tower (1), second adsorption tower (2) and third adsorption tower (3) top, the position department fixedly connected with first solenoid valve (41), three on outlet duct (4) surface and the top of being close to, three the fixed intercommunication in top of outlet duct (4) has first connecting pipe (8), the fixed intercommunication in central authorities of outlet duct (4) has sweeping gas inlet tube (7), the fixed surface of sweeping gas inlet tube (7) has cup jointed third solenoid valve (71), three the one end that outlet duct (4) were kept away from to sweeping gas inlet tube (7) is all fixed the bottom that communicates in blast pipe (5), the fixed intercommunication in one end that sweeping gas inlet tube (7) was kept away from to first connecting pipe (8) has heating cabinet (9), the central part of the left side of the top of the heating box (9) is fixedly communicated with an ammonia gas inlet pipe (10), the central parts of the tops of the first adsorption tower (1), the second adsorption tower (2) and the third adsorption tower (3) are respectively fixedly communicated with a first four-way pipe (11), a second four-way pipe (15) and a third four-way pipe (16), the left sides of the bottoms of the first four-way pipe (11), the second four-way pipe (15) and the third four-way pipe (16) are respectively fixedly communicated with a tail gas outlet pipe (12), the surface of the tail gas outlet pipe (12) is fixedly connected with a fourth electromagnetic valve (121), the central parts of the bottoms of the first four-way pipe (11), the second four-way pipe (15) and the third four-way pipe (16) are respectively fixedly communicated with a tail gas inlet pipe (13), the surface of the tail gas inlet pipe (13) is fixedly connected with a fifth electromagnetic valve (131), and the bottoms of the three tail gas inlet pipes (13) are mutually communicated, the right side of first four-way pipe (11), second four-way pipe (15) and third four-way pipe (16) bottom all is fixed the intercommunication and has sweep gas eduction tube (14), the equal fixedly connected with sixth solenoid valve (141) in surface of sweep gas eduction tube (14).

2. A three column pressure swing adsorption unit for VOCs based gas treatment as claimed in claim 1 wherein: pressure balance pipes (6) are fixedly communicated among the three air outlet pipes (4), and second electromagnetic valves (61) are fixedly connected to the left side and the right side of the surface of each pressure balance pipe (6).

3. A three column pressure swing adsorption unit for VOCs based gas treatment as claimed in claim 1 wherein: the bottom of three tail gas eduction tubes (12) is through second connecting pipe (17) intercommunication each other, one end fixedly connected with vacuum pump (171) of tail gas inlet tube (13) are kept away from in second connecting pipe (17).

4. A three column pressure swing adsorption unit for VOCs based gas treatment as claimed in claim 1 wherein: three the bottom of sweeping gas eduction tube (14) is passed through fourth connecting pipe (19) and is communicate each other, the one end fixedly connected with draught fan (191) and heat exchanger (192) in proper order of sweeping gas eduction tube (14) are kept away from in fourth connecting pipe (19).

5. A three column pressure swing adsorption unit for VOCs based gas treatment as claimed in claim 1 wherein: the inside of heating cabinet (9) is hollow structure, the equal fixedly connected with electric heater (91) in left and right sides and top and bottom of heating cabinet (9) inner wall.

6. A three column pressure swing adsorption unit for VOCs based gas treatment as claimed in claim 1 wherein: the inside fixedly connected with heating pipe (92) of heating cabinet (9), both ends are linked together with ammonia induction pipe (10) and first connecting pipe (8) respectively about heating pipe (92), the interlude of heating pipe (92) sets up for spiraling the form, the even fixedly connected with conducting strip (93) in surface of heating pipe (92).

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