Rectification tail gas treatment device

Abstract

The utility model discloses a rectification tail gas treatment device which comprises a liquefaction condensation unit, a vaporization unit, an incineration unit and a waste heat utilization unit which are sequentially connected, and the liquefaction condensation unit is used for carrying out liquefaction condensation on dimethylamine in rectification tail gas and collecting dimethylamine waste liquid; the vaporization unit is used for heating and vaporizing dimethylamine waste liquid in the liquefying and condensing unit to obtain dimethylamine gas, the incineration unit is used for mixing the dimethylamine gas in the vaporization unit with natural gas and then combusting, and the waste heat utilization unit is used for recycling a part of generated steam for the vaporization unit. And recycling the residual steam for a rectification device. According to the rectification tail gas treatment device, volatilization of dimethylamine can be reduced, then dimethylamine gas is obtained through vaporization, the generated dimethylamine gas and natural gas are mixed and then discharged for combustion, stable combustion can be achieved, the using amount of the natural gas can be effectively reduced, and therefore the operation energy consumption of equipment can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas treatment, and particularly relates to a rectification tail gas treatment device. Background Art

[0002] In the existing DMF rectification and purification device, during the high-temperature extraction process, DMF decomposition will produce waste gas containing dimethylamine, which emits a foul smell and has a high nitrogen content. The traditional treatment process condenses and liquefies this waste gas and passes it into an organic waste gas incineration treatment device for harmless treatment through methods such as regenerative combustion. However, a large amount of gas needs to be supplemented during the treatment process, resulting in high treatment costs; and when the concentration of dimethylamine in the material fluctuates, the waste gas treatment device will have unstable operating conditions. Content of the Utility Model

[0003] In view of this, in order to overcome the defects of the prior art, the purpose of the utility model is to provide a rectification tail gas treatment device, which can centrally treat dimethylamine, reduce its volatilization and incineration time, reduce operating energy consumption, and meet environmental protection requirements.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A rectification tail gas treatment device includes a liquefaction and condensation unit, a vaporization unit, an incineration unit, and a waste heat utilization unit connected in sequence. The liquefaction and condensation unit is used to liquefy and condense dimethylamine in the rectification tail gas and collect dimethylamine waste liquid. The vaporization unit is used to heat and vaporize the dimethylamine waste liquid in the liquefaction and condensation unit to obtain dimethylamine gas. The incineration unit is used to burn the dimethylamine gas in the vaporization unit after mixing it with natural gas. The waste heat utilization unit is used to reuse a part of the generated steam for the vaporization unit, and the remaining part of the steam is used for reuse in the rectification device.

[0006] By absorbing, liquefying, and collecting dimethylamine in the rectification tail gas, then vaporizing it to obtain dimethylamine gas, mixing the generated dimethylamine gas with natural gas and then burning it, stable combustion can be achieved by adjusting the mixing ratio. And using the heat generated by combustion to produce steam, part of the steam is recycled to the vaporization unit, and the excess steam is recycled to the rectification production device, which can achieve the purpose of energy conservation and cost reduction, and at the same time reduce the volatilization of dimethylamine.

[0007] According to some preferred implementation aspects of the present utility model, the liquefaction and condensation unit includes a first condenser and a storage tank. The outlet of the first condenser is connected to the inlet of the storage tank. The inlet of the first condenser is used to introduce rectification tail gas, and the storage tank is used to store the condensed dimethylamine waste liquid. The setting of the first condenser can liquefy and collect dimethylamine in the rectification tail gas, which is beneficial to reducing the volatilization of dimethylamine. The setting of the storage tank can store the condensed dimethylamine waste liquid until a certain amount and then conduct centralized treatment, thereby reducing the operation time of the entire rectification tail gas treatment device and being beneficial to reducing operation energy consumption.

[0008] According to some preferred implementation aspects of the present utility model, the vaporization unit includes a stripping tower, a reboiler, a second condenser and a buffer tank. The reboiler is connected to the stripping tower. The outlet of the storage tank is connected to the inlet of the stripping tower. The outlet of the stripping tower is connected to the inlet of the second condenser. The outlet of the second condenser is connected to the inlet of the buffer tank.

[0009] According to some preferred implementation aspects of the present utility model, the vaporization unit further includes a pressure stabilizing tank. The outlet of the buffer tank is connected to the inlet of the pressure stabilizing tank. Both the buffer tank and the pressure stabilizing tank are used to store the vaporized dimethylamine gas. By introducing the dimethylamine gas into the pressure stabilizing tank, the flow rate of the dimethylamine gas flowing into the incineration unit can be further adjusted by regulating the pressure and gas flow rate of the pressure stabilizing tank, thereby being able to adjust the mixing ratio of the dimethylamine gas and natural gas.

[0010] According to some preferred implementation aspects of the present utility model, the vaporization unit includes a first passage, a second passage, a third passage and a fourth passage. The first passage is used for the dimethylamine gas vaporized from the stripping tower to flow into the pressure stabilizing tank. The second passage, the third passage and the fourth passage are all used to reflux the dimethylamine aqueous solution to the top of the stripping tower.

[0011] According to some preferred implementation aspects of the present utility model, the stripping tower includes a condensate inlet. The second condenser includes a first condensate outlet. The buffer tank includes a second condensate outlet. The pressure stabilizing tank includes a third condensate outlet;

[0012] One end of the second passage is connected to the condensate inlet, and the other end of the second passage is connected to the first condensate outlet. One end of the third passage is connected to the second condensate outlet, and the other end of the third passage is connected to the second passage. One end of the fourth passage is connected to the third condensate outlet, and the other end of the fourth passage is connected to the third passage.

[0013] According to some preferred implementation aspects of the present utility model, the incineration unit includes a burner and an incinerator. The burner is connected to the incinerator, and the outlet of the pressure stabilizing tank is connected to the burner for introducing dimethylamine gas into the burner. In some embodiments of the present utility model, the ratio of dimethylamine gas to natural gas in the burner can be further adjusted by adjusting the pressure of the pressure stabilizing tank, and the adjustment of the content of dimethylamine gas within the range of 0 to 100% can be achieved; and during normal operation, the proportion of the content of dimethylamine gas in the burner is greater than or equal to 50%, which can greatly reduce the usage amount of natural gas, thereby reducing the energy consumption of equipment operation.

[0014] According to some preferred implementation aspects of the present utility model, the burner further includes a natural gas interface for introducing natural gas into the burner.

[0015] According to some preferred implementation aspects of the present utility model, the waste heat utilization unit includes a waste heat boiler, a first branch, and a second branch. The waste heat boiler is connected to the incinerator, and the waste heat boiler is used to generate steam.

[0016] According to some preferred implementation aspects of the present utility model, the first branch is used to transport part of the steam generated by the waste heat boiler to the reboiler; the second branch is used to transport the remaining part of the steam generated by the waste heat boiler to the rectification device.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows: A rectification tail gas treatment device of the present utility model can absorb and liquefy and collect dimethylamine in the rectification tail gas by setting a liquefaction and condensation unit, a vaporization unit, an incineration unit, and a waste heat utilization unit, reduce the volatilization of dimethylamine, and then obtain dimethylamine gas through vaporization. After mixing the generated dimethylamine gas with natural gas and then burning it, stable combustion can be achieved, and the usage amount of natural gas can be effectively reduced, thereby helping to reduce the energy consumption of equipment operation. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of a rectification tail gas treatment device in a preferred embodiment of the present utility model;

[0020] Among them, the reference numerals are:

[0021] The first condenser - 1, storage tank - 2, stripping column - 3, reboiler - 4, second condenser - 5, buffer tank - 6, pressure stabilizing tank - 7, burner - 8, natural gas interface - 81, incinerator - 9, waste heat boiler - 10, first passage - 11, second passage - 12, third passage - 13, fourth passage - 14, condensate inlet - 15, first condensate outlet - 16, second condensate outlet - 17, third condensate outlet - 18, first branch - 19, second branch - 20. Detailed implementation manners

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Refer to Figure 1 , the rectification tail gas treatment device in this embodiment includes a liquefaction and condensation unit, a vaporization unit, an incineration unit, and a waste heat utilization unit connected in sequence. Among them, the rectification tail gas enters from the liquefaction and condensation unit. The liquefaction and condensation unit is used to liquefy and condense dimethylamine in the rectification tail gas and collect dimethylamine waste liquid. The vaporization unit is used to heat and vaporize the dimethylamine waste liquid in the liquefaction and condensation unit to obtain dimethylamine gas. The incineration unit is used to burn the dimethylamine gas in the vaporization unit after mixing it with natural gas. The waste heat utilization unit is used to recycle a part of the generated steam for the vaporization unit, and the remaining part of the steam is used for recycling in the rectification device.

[0024] Specifically, the liquefaction and condensation unit includes the first condenser 1 and the storage tank 2. The outlet of the first condenser 1 is connected to the inlet of the storage tank 2. The inlet of the first condenser 1 is used to introduce the rectification tail gas. The storage tank 2 is used to store the condensed dimethylamine waste liquid. The setting of the first condenser 1 can liquefy and collect dimethylamine in the rectification tail gas, which is beneficial to reducing the volatilization of dimethylamine. The setting of the storage tank 2 can store the condensed dimethylamine waste liquid to a certain amount and then conduct centralized treatment, thereby reducing the operation time of the entire rectification tail gas treatment device and being beneficial to reducing the operation energy consumption.

[0025] Further, the vaporization unit in this embodiment includes a stripping column 3, a reboiler 4, a second condenser 5, a buffer tank 6, a pressure stabilizing tank 7, and a first passage 11. The outlet of the storage tank 2 is connected to the inlet of the stripping column 3. The dimethylamine waste liquid is vaporized in the stripping column 3 to obtain dimethylamine gas. The reboiler 4 is connected to the stripping column 3 to provide heat for the vaporization in the stripping column 3. The outlet of the stripping column 3 is connected to the inlet of the second condenser 5. The outlet of the second condenser 5 is connected to the inlet of the buffer tank 6. The outlet of the buffer tank 6 is connected to the inlet of the pressure stabilizing tank 7. Both the buffer tank 6 and the pressure stabilizing tank 7 are used to store the vaporized dimethylamine gas. The dimethylamine gas vaporized in the stripping column 3 flows into the pressure stabilizing tank 7 through the first passage 11. By adjusting the pressure and gas flow rate of the pressure stabilizing tank 7, the flow rate of the dimethylamine gas flowing into the incineration unit can be further adjusted. The specific flow direction of the first passage 11 is as follows: The dimethylamine gas in the stripping column enters the second condenser 5 from the outlet of the stripping column 3 through the inlet of the second condenser 5, then enters the buffer tank 6 from the outlet of the second condenser 5 through the inlet of the buffer tank 6, and finally enters the pressure stabilizing tank 7 from the outlet of the buffer tank 6 through the inlet of the pressure stabilizing tank 7.

[0026] In addition, the vaporization unit further includes a second passage 12, a third passage 13, and a fourth passage 14. Specifically, the stripping column 3 includes a condensate inlet 15, the second condenser 5 includes a first condensate outlet 16, the buffer tank 6 includes a second condensate outlet 17, and the pressure stabilizing tank 7 includes a third condensate outlet 18. One end of the second passage 12 is connected to the condensate inlet 15, and the other end of the second passage 12 is connected to the first condensate outlet 16. One end of the third passage 13 is connected to the second condensate outlet 17, and the other end of the third passage 13 is connected to the second passage 12. One end of the fourth passage 14 is connected to the third condensate outlet 18, and the other end of the fourth passage 14 is connected to the third passage 13. The second passage 12 is used to reflux the dimethylamine aqueous solution generated in the second condenser 5 to the top of the stripping column 3. The third passage 13 is used to reflux the dimethylamine aqueous solution generated in the buffer tank 6 to the top of the stripping column 3. The fourth passage 14 is used to reflux the dimethylamine aqueous solution generated in the pressure stabilizing tank 7 to the top of the stripping column 3.

[0027] Further, the incineration unit includes a burner 8 and an incinerator 9. The burner 8 is connected to the incinerator 9. The outlet of the pressure stabilizing tank 7 is connected to the burner 8 to introduce the dimethylamine gas into the burner 8. The burner 8 further includes a natural gas interface 81 to introduce natural gas into the burner 8. The dimethylamine gas and natural gas are mixed evenly in the burner 8 and then enter the incinerator 9 for combustion. In this embodiment, the flow rate of the dimethylamine gas flowing into the burner 8 can be adjusted by adjusting the pressure and gas flow rate of the pressure stabilizing tank 7, and the ratio of the dimethylamine gas to natural gas in the burner 8 can be further adjusted, which can effectively reduce the consumption of natural gas and thus reduce the energy consumption of equipment operation.

[0028] The waste heat utilization unit includes a waste heat boiler 10, a first branch 19 and a second branch 20. The waste heat boiler 10 is connected to the incinerator 9. The waste heat boiler 10 is used to generate steam. The first branch 19 is used to transport part of the steam generated by the waste heat boiler 10 to the reboiler 4 to provide heat energy to the reboiler 4. The second branch 20 is used to transport the remaining part of the steam generated by the waste heat boiler 10 to the rectification device. The reuse of steam can achieve the purpose of energy conservation and cost reduction.

[0029] The working process of the rectification tail gas treatment device in this embodiment is described as follows:

[0030] The rectification tail gas enters the first condenser 1 for liquefaction condensation first and is discharged into the storage tank 2 for collection. When the dimethylamine waste liquid in the storage tank 2 reaches a fixed liquid level, the machine is started for the next vaporization, that is, the dimethylamine waste liquid enters the stripping column 3 for vaporization. The obtained dimethylamine gas enters the pressure stabilizing tank 7 after passing through the second condenser 5 and the buffer tank 6. Then, the content of the dimethylamine gas discharged into the burner 8 is controlled by regulating the pressure of the pressure stabilizing tank 7. The dimethylamine gas is mixed with natural gas in the burner 8 and enters the incinerator 9 as mixed gas for incineration. The heat generated after incineration flows to the waste heat boiler 10 and is utilized for waste heat through the first branch 19 and the second branch 20 respectively.

[0031] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A rectification tail gas treatment device, characterized in that, It includes a liquefaction and condensation unit, a vaporization unit, an incineration unit and a waste heat utilization unit connected in sequence. The liquefaction and condensation unit is used for liquefying and condensing dimethylamine in the rectification tail gas and collecting dimethylamine waste liquid. The vaporization unit is used for heating and vaporizing the dimethylamine waste liquid in the liquefaction and condensation unit to obtain dimethylamine gas. The incineration unit is used for mixing the dimethylamine gas in the vaporization unit with natural gas and then burning it. The waste heat utilization unit is used for recycling a part of the generated steam to the vaporization unit and the remaining part of the steam to the rectification device for reuse.

2. The rectification tail gas treatment device according to claim 1, characterized in that, The liquefaction and condensation unit includes a first condenser and a storage tank. The outlet of the first condenser is connected to the inlet of the storage tank. The inlet of the first condenser is used for introducing the rectification tail gas. The storage tank is used for storing the condensed dimethylamine waste liquid.

3. The rectification tail gas treatment device according to claim 2, wherein The vaporization unit includes a stripping column, a reboiler, a second condenser and a buffer tank. The reboiler is connected to the stripping column. The outlet of the storage tank is connected to the inlet of the stripping column. The outlet of the stripping column is connected to the inlet of the second condenser. The outlet of the second condenser is connected to the inlet of the buffer tank.

4. The rectification tail gas treatment device according to claim 3, characterized in that, The vaporization unit further includes a pressure stabilizing tank. The outlet of the buffer tank is connected to the inlet of the pressure stabilizing tank. Both the buffer tank and the pressure stabilizing tank are used for storing the vaporized dimethylamine gas.

5. The rectification tail gas treatment device according to claim 4, characterized in that, The vaporization unit includes a first passage, a second passage, a third passage and a fourth passage. The first passage is used for the dimethylamine gas vaporized from the stripping column to flow into the pressure stabilizing tank. The second passage, the third passage and the fourth passage are all used for refluxing the dimethylamine aqueous solution to the top of the stripping column.

6. The rectifying tail gas treatment device according to claim 5, characterized in that The stripping column includes a condensate inlet. The second condenser includes a first condensate outlet. The buffer tank includes a second condensate outlet. The pressure stabilizing tank includes a third condensate outlet. One end of the second passage is connected to the condensate inlet, and the other end of the second passage is connected to the first condensate outlet. One end of the third passage is connected to the second condensate outlet, and the other end of the third passage is connected to the second passage. One end of the fourth passage is connected to the third condensate outlet, and the other end of the fourth passage is connected to the third passage.

7. The rectifying tail gas treatment device according to claim 4, characterized in that The incineration unit includes a burner and an incinerator. The burner is connected to the incinerator. The outlet of the pressure stabilizing tank is connected to the burner to introduce dimethylamine gas into the burner.

8. The rectification tail gas treatment device according to claim 7, characterized in that, The burner further includes a natural gas interface for introducing natural gas into the burner.

9. The rectification tail gas treatment device according to claim 7, wherein, The waste heat utilization unit includes a waste heat boiler, a first branch and a second branch. The waste heat boiler is connected to the incinerator. The waste heat boiler is used for generating steam.

10. The rectification tail gas treatment device according to claim 9, wherein The first branch is used for transporting a part of the steam generated by the waste heat boiler to the reboiler. The second branch is used for transporting the remaining part of the steam generated by the waste heat boiler to the rectification device.

Images