CN220424946U - Carbon dioxide purification device - Google Patents
Carbon dioxide purification device Download PDFInfo
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- CN220424946U CN220424946U CN202321686057.2U CN202321686057U CN220424946U CN 220424946 U CN220424946 U CN 220424946U CN 202321686057 U CN202321686057 U CN 202321686057U CN 220424946 U CN220424946 U CN 220424946U
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 238000000746 purification Methods 0.000 title claims abstract description 82
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 52
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 40
- 238000001179 sorption measurement Methods 0.000 claims abstract description 113
- 239000002994 raw material Substances 0.000 claims abstract description 25
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 230000002441 reversible effect Effects 0.000 claims description 28
- 238000003860 storage Methods 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 239000003463 adsorbent Substances 0.000 abstract description 14
- 230000002829 reductive effect Effects 0.000 abstract description 11
- 239000012535 impurity Substances 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 115
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000003795 desorption Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 230000008929 regeneration Effects 0.000 description 5
- 238000011069 regeneration method Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010943 off-gassing Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Separation Of Gases By Adsorption (AREA)
Abstract
The utility model provides a carbon dioxide purifying device, and relates to the technical field of chemical equipment. Comprises a feed gas compression unit, a pressure swing adsorption purification unit and a carbon dioxide pressurizing unit; the raw material gas compression unit comprises a raw material gas compressor; the pressure swing adsorption purification units are multiple groups, and the multiple groups of pressure swing adsorption purification units are sequentially communicated; the feed gas compressor is communicated with the pressure swing adsorption purification unit positioned at the head end; the carbon dioxide pressurizing unit comprises a carbon dioxide compressor communicated with the pressure swing adsorption purification unit at the tail end, and a vacuum pump is arranged between the carbon dioxide compressor and the pressure swing adsorption purification unit at the tail end; the tail gas compressed in the device is dehydrated and pressurized by the carbon dioxide gas of the device, and then the device runs in the device, CO2 is adsorbed in the adsorbent, and impurity gas is discharged from the top of the tower; the yield of CO2 of the whole device is improved, the part of residual gas which is introduced into the raw material gas compressor is reduced, the electricity consumption is reduced, and the production is more economical.
Description
Technical Field
The utility model relates to the technical field of chemical equipment, in particular to a carbon dioxide purifying device.
Background
In today's carbon dioxide purification processes, a rectifying column is typically used to purify a carbon dioxide feedstock containing impurities. The rectifying tower is a tower type gas-liquid contacting device for rectifying, and the principle is that the light component substances in the liquid phase, i.e. low-boiling substances, are transferred into the gas phase, and the heavy component (high-boiling substances) in the gas phase are transferred into the liquid phase by utilizing the property that each component in the mixture has different volatility, i.e. the vapor pressure of each component is different at the same temperature, so that the aim of separating each component of substances is realized.
However, in actual production, the raw materials fed into the rectifying tower through one feeding pipe may have different thermal states, so that the rectifying tower has different feeding conditions. Under different feeding conditions, the reflux quantity of a stripping section in the rectifying tower and the gas-liquid balance in the rectifying tower are obviously influenced, so that the purification efficiency of the rectifying tower is adversely affected, the pressure of waste gas is not fully utilized, and the energy consumption is high.
Disclosure of Invention
The utility model aims to provide a carbon dioxide purifying device which solves the problems of the prior art.
The technical scheme of the application is realized as follows:
the application provides a carbon dioxide purifying device, which comprises a feed gas compression unit, a pressure swing adsorption purifying unit and a carbon dioxide pressurizing unit;
the raw material gas compression unit comprises a raw material gas compressor;
the pressure swing adsorption purification units are multiple groups, and the multiple groups of pressure swing adsorption purification units are sequentially communicated; the feed gas compressor is communicated with the pressure swing adsorption purification unit positioned at the head end;
the carbon dioxide pressurizing unit comprises a carbon dioxide compressor communicated with the pressure swing adsorption purification unit at the tail end, and a vacuum pump is arranged between the carbon dioxide compressor and the pressure swing adsorption purification unit at the tail end.
In some technical schemes of the utility model, the pressure swing adsorption purification unit comprises an adsorption tower, a raw material gas inlet valve, a replacement gas outlet valve, a control pressure control valve, a product gas outlet valve, a pre-pressure boosting reverse discharge valve, a vacuumizing valve and a replacement gas inlet valve;
the replacement air outlet valve, the pressure control valve and the product gas outlet valve are sequentially communicated, and the product gas outlet valve is communicated with the top of the adsorption tower;
the feed gas inlet valve, the pre-boosting reverse discharge valve, the vacuumizing valve and the replacement air inlet valve are sequentially communicated, and the feed gas inlet valve is communicated with the bottom of the adsorption tower;
feed gas inlet valves respectively positioned in the multiple groups of pressure swing adsorption purification units are sequentially communicated;
the replacement air outlet valves respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
the pressure control valves respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
product gas outlet valves respectively positioned in the multiple groups of pressure swing adsorption purification units are sequentially communicated;
the pre-pressure boosting reverse discharge valves respectively positioned in the multiple groups of pressure swing adsorption purification units are sequentially communicated;
the vacuumizing valves respectively positioned in the multiple groups of pressure swing adsorption purification units are sequentially communicated;
the replacement air inlet valves respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
a feed gas inlet valve in the pressure swing adsorption purification unit at the head end is communicated with a feed gas compressor;
the output end of the replacement air outlet valve in the pressure swing adsorption purification unit at the tail end is communicated with an air storage tank, and a second pneumatic regulating valve is arranged between the air storage tank and the replacement air outlet valve;
the output end of the air storage tank is provided with a raw material removing compressor.
In some embodiments of the present utility model, a first valve is disposed between the output end of the air tank and the raw material removing compressor.
In some technical schemes of the utility model, a pressure control valve in the pressure swing adsorption purification unit at the tail end is communicated with a product gas outlet valve through a second valve;
a third valve is arranged between the output end of the air storage tank and the first valve;
the communication part of the control pressure control valve and the second valve is communicated with the third valve;
a fourth valve is arranged between the control pressure control valve and the third valve;
the communication part of the product gas outlet valve and the second valve is provided with a first pneumatic adjusting valve, and the first pneumatic adjusting valve is communicated with a third valve through a pipeline.
In some embodiments of the present utility model,
the output end of the pre-boosting reverse discharge valve in the pressure swing adsorption purification unit at the tail end is communicated with a buffer tank, and a third pneumatic regulating valve is arranged between the pre-boosting reverse discharge valve in the pressure swing adsorption purification unit at the tail end and the buffer tank.
In some embodiments of the present utility model,
a fifth valve is communicated between the pre-pressure boosting reverse discharge valve and the third pneumatic adjusting valve in the pressure swing adsorption purification unit at the tail end, and the output end of the fifth valve is communicated with the output end of the first pneumatic adjusting valve.
In some technical schemes of the utility model, the output end of the vacuumizing valve in the pressure swing adsorption purification unit at the tail end is provided with a vacuum pump, and the vacuum pump is communicated with a product gas compressor;
the replacement air inlet valve in the pressure swing adsorption purification unit at the tail end is provided with a fourth pneumatic adjusting valve which is communicated with the product air compressor.
Compared with the prior art, the embodiment of the utility model has at least the following advantages or beneficial effects:
through a compressor, a purifying tower and other devices. The tail gas after the carbon dioxide gas is compressed in the device is dehydrated and pressurized to 0.4-0.45 MPa, and then enters into six towers to operate uninterruptedly, CO2 is absorbed in the adsorbent, and impurity gas is discharged from the tower top. And finally, compressing the desorption gas at the bottom of the tower again, and enabling the product gas to enter a buffer tank to be discharged as the product gas. The concentration of the product gas CO2 is more than or equal to 98.0 percent, and the recovery rate of CO2 is more than or equal to 85 percent. The utility model is characterized in that: wherein, the valve KV210 is introduced into the tower from the lower part by utilizing high-purity CO2 remained in the V201 buffer tank; the valve can improve the yield of CO2 of the whole device, and the part of the residual gas which is introduced into the raw gas compressor is reduced, so that the electricity consumption of the raw gas compressor is reduced, and the production is more economical.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall purification process of carbon dioxide in the present utility model;
FIG. 2 is a schematic diagram of a single unit pressure swing adsorption purification unit according to the present utility model.
Icon: 1. a feed gas inlet valve; 2. replacing the air outlet valve; 3. a control pressure control valve; 4. a product gas outlet valve; 5. a pre-pressure boost reverse discharge valve; 6. a vacuum valve; 7. replacing the air inlet valve; 8. an adsorption tower; 9. a feed gas compressor; 10. a second pneumatic control valve; 11. a gas storage tank; 12. a first valve; 13. removing the raw material compressor; 14. a third valve; 15. a fourth valve; 16. a second valve; 17. a first pneumatic control valve; 18. a fifth valve; 19. a third pneumatic control valve; 20. a fourth pneumatic control valve; 21. a buffer tank; 22. a product gas compressor; 23. and a vacuum pump.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Examples
Please refer to fig. 1-2.
The application provides a carbon dioxide purifying device, which comprises a feed gas compression unit, a pressure swing adsorption purifying unit and a carbon dioxide pressurizing unit;
the raw gas compression unit comprises a raw gas compressor 9;
the pressure swing adsorption purification units are multiple groups, and the multiple groups of pressure swing adsorption purification units are sequentially communicated; the feed gas compressor 9 is communicated with a pressure swing adsorption purification unit positioned at the head end;
the carbon dioxide pressurizing unit comprises a carbon dioxide compressor communicated with the pressure swing adsorption purification unit at the tail end, and a vacuum pump 23 is arranged between the carbon dioxide compressor and the pressure swing adsorption purification unit at the tail end.
In some technical schemes of the utility model, the pressure swing adsorption purification unit comprises an adsorption tower 8, a raw material gas inlet valve 1, a replacement gas outlet valve 2, a pressure control valve 3, a product gas outlet valve 4, a pre-pressure boosting reverse discharge valve 5, a vacuumizing valve 6 and a replacement gas inlet valve 7;
the replacement air outlet valve 2, the control pressure control valve 3 and the product air outlet valve 4 are sequentially communicated, and the product air outlet valve 4 is communicated with the top of the adsorption tower 8;
the feed gas inlet valve 1, the pre-pressure boosting reverse discharge valve 5, the vacuumizing valve 6 and the replacement air inlet valve 7 are sequentially communicated, and the feed gas inlet valve 1 is communicated with the bottom of the adsorption tower 8;
feed gas inlet valves 1 respectively positioned in the multiple groups of pressure swing adsorption purification units are sequentially communicated;
the replacement air outlet valves 2 respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
the pressure control valves 3 respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
product gas outlet valves 4 respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
the pre-pressure boosting reverse discharge valves 5 respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
the vacuumizing valves 6 respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
the replacement air inlet valves 7 respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
the feed gas inlet valve 1 in the pressure swing adsorption purification unit at the head end is communicated with the feed gas compressor 9;
the output end of the replacement air outlet valve 2 in the pressure swing adsorption purification unit at the tail end is communicated with an air storage tank 11, and a second pneumatic regulating valve 10 is arranged between the air storage tank 11 and the replacement air outlet valve 2;
the output end of the gas storage tank 11 is provided with a raw material removing compressor 13.
In some embodiments of the present utility model, a first valve 12 is provided between the output end of the air tank 11 and the raw material removing compressor 13.
In some embodiments of the present utility model, the pressure control valve 3 in the pressure swing adsorption purification unit at the tail end is communicated with the product gas outlet valve 4 through the second valve 16;
a third valve 14 is arranged between the output end of the air storage tank 11 and the first valve 12;
the communication part of the pressure control valve 3 communicated with the second valve 16 is communicated with the third valve 14;
a fourth valve 15 is arranged between the pressure control valve 3 and the third valve 14;
the communication place of the product gas outlet valve 4 and the second valve 16 is provided with a first pneumatic adjusting valve 17, and the first pneumatic adjusting valve 17 and the third valve 14 are communicated through a pipeline.
In some embodiments of the present utility model,
the output end of the pre-pressure boosting reverse discharging valve 5 in the pressure swing adsorption purification unit at the tail end is communicated with a buffer tank 21, and a third pneumatic adjusting valve 19 is arranged between the pre-pressure boosting reverse discharging valve 5 in the pressure swing adsorption purification unit at the tail end and the buffer tank 21.
In some embodiments of the present utility model,
a fifth valve 18 is communicated between the pre-pressure boosting reverse discharge valve 5 and the third pneumatic adjusting valve 19 in the pressure swing adsorption purification unit at the tail end, and the output end of the fifth valve 18 is communicated with the output end of the first pneumatic adjusting valve 17.
In some technical schemes of the utility model, the output end of the vacuumizing valve 6 in the pressure swing adsorption purification unit at the tail end is provided with a vacuum pump 23, and the vacuum pump 23 is communicated with a product gas compressor 22;
the output end of the replacement air inlet valve 7 in the pressure swing adsorption purification unit at the tail end is provided with a fourth pneumatic control valve 20, and the fourth pneumatic control valve 20 is communicated with a product air compressor 22.
The working principle of the equipment is as follows: firstly, introducing raw material gas from outside the boundary into a raw material gas liquid separating tank, introducing the gas obtained after the raw material gas is separated by the raw material gas liquid separating tank into a raw material gas compressor 9, pressurizing the pressure of the gas from normal pressure to 0.4-0.45 MPa, sequentially introducing the gas into a first water cooler for cooling, and introducing the gas obtained after condensate separation by a second post-separator into a pressure swing adsorption purification unit for purification.
The gas from the compression unit enters the adsorption tower 8 from bottom to top, the adsorption tower 8 adsorbs components such as water, carbon dioxide and the like carried by the gas, nitrogen, oxygen and the like which are not adsorbed are directly discharged from the top of the tower after passing through the pressure regulating system, the desorbed gas at the bottom of the tower enters the buffer tank 21 after being reversely discharged and pumped out, the buffer tank 21 is a desorbed gas mixing buffer tank 21, and the gas enters the carbon dioxide compression unit at stable pressure and flow.
The pressure swing adsorption purification unit adopts a 6-2-1RP/V band sequential discharge replacement vacuumizing regeneration process flow, namely the device consists of six adsorption towers 8, and the flow adopts a mode of two-tower adsorption, sequential discharge, primary pressure equalizing, replacement, reverse discharge and vacuumizing regeneration to carry out desorption.
The desorbed carbon dioxide product gas from the purification unit enters a carbon dioxide compressor, the pressure of the gas is increased from 20KPa to 0.4MPa, the gas enters a second water cooler in sequence for cooling, the gas after condensing and separating condensate by a second post-machine separator enters a product gas storage tank, and the gas is output to a boundary region through a stable pressure and flow pipeline, wherein a small part of the carbon dioxide product gas is used for the displacement gas of the PSA purification unit.
The working principle and basic working steps of the pressure swing adsorption purification unit are as follows:
1. pressure swing adsorption theory of operation:
the principle of purifying carbon dioxide from gas by adopting PSA separation gas technology is to utilize the selectivity of the adsorbent to different adsorbents and the characteristic that the adsorption capacity of the adsorbent to the adsorbents is different along with the pressure change, adsorb impurity components in raw materials under high pressure and desorb the impurities under low pressure so as to regenerate the adsorbent. The whole operation is carried out at ambient temperature.
2. The basic working steps are as follows:
the basic working steps of pressure swing adsorption are divided into two steps of adsorption and regeneration. And the regeneration comprises the following three steps:
1. the pressure of the adsorption tower 8 is reduced to low pressure
The depressurization is first carried out in the direction of adsorption, followed by depressurization against the direction of adsorption. When the pressure is released in the forward direction, a part of the adsorbent is still in an adsorption state. At the time of reverse pressure release, part of the impurities adsorbed are desorbed from the adsorbent and discharged from the adsorption column 8.
2. The adsorbent is regenerated by flushing with off-gassing to remove impurities still remaining in the adsorbent.
3. The adsorption column 8 is raised to an adsorption pressure in preparation for the separation of the feed gas again.
The device adopts a pressure equalizing displacement vacuumizing pressure-changing adsorption process for 1 time by 6 towers, and each adsorption tower 8 needs 9 steps of adsorption, forward discharging, pressure equalizing pressure drop, displacement, reverse pressure releasing, vacuumizing, pre-boosting, pressure equalizing boosting, final boosting and the like in one cycle. The 6 adsorption towers 8 are staggered in arrangement of executing programs to form a closed cycle so as to ensure continuous input of raw materials and continuous output of products.
The whole process is mainly realized by 45 program control valves and 4 regulating valves. The program valve numbers are shown in the flow chart or the instrument file.
2, valve function:
the 6 feed gas inlet valves 1 are in turn: KV201a, KV201b, KV201c, KV201d, KV201e, KV201f;
the 6 replacement air outlet valves 2 are sequentially as follows: KV202a, KV202b, KV202c, KV202d, KV202e, KV202f;
the 6 pressure control valves 3 are sequentially: KV203a, KV203b, KV203c, KV203d, KV203e, KV203f; the pressure control valve 3 is called a forward-discharge, pressure equalizing and final-charging valve;
the 6 product gas outlet valves 4 are in turn: KV204a, KV204b, KV204c, KV204d, KV204e, KV204f;
the 6 pre-pressure boosting reverse discharge valves 5 are sequentially as follows: KV205a, KV205b, KV205c, KV205d, KV205e, KV205f; the pre-pressure boosting reverse discharge valve 5 is called a pre-pressure boosting reverse discharge valve;
the 6 vacuumizing valves 6 are sequentially as follows: KV206a, KV206b, KV206c, KV206d, KV206e, KV206f;
the 7 replacement intake valves 7 are in turn: KV207a, KV207b, KV207c, KV207d, KV207e, KV207f;
the serial numbers of the 6 adsorption towers 8 are as follows: A. b, C, D, E, F; corresponding valve numbers: a. b, c, d, e, f;
the timing diagram is shown in the following table
Third section, PSA working process
Each adsorption tower 8 needs 9 steps of adsorption, forward discharge, uniform pressure drop, replacement, reverse pressure release, vacuumizing, pre-pressure rise, uniform pressure rise, final pressure rise and the like in a one-time circulation process. The 6 adsorption towers 8 are staggered in the arrangement of the execution program to form a closed cycle so as to ensure continuous input of raw materials and continuous output of products. The working relationship of each tower is as follows:
the working process will now be described by taking the tower a as an example: (the opening and closing of the valve is described only in relation to column A)
1. Adsorption of
Opening KV201a;
raw gas from the compressor enters the tower A from bottom to top through a valve KV201a, impurities are adsorbed under the working pressure, non-adsorbed product components flow out through a valve KV204a, most of the raw gas is output from the system as a product, and the small part of the raw gas is subjected to final pressure boosting to the tower B through a valve KV 208. Valve KV208 is a second valve 16.
After adsorption is finished, valve KV201a is closed, raw gas feeding is stopped, and meanwhile valve KV204a also has no product gas output.
2. Forward pressure release
Opening a valve KV203a and KV209;
the gas of the tower A is discharged by a valve KV203a and a valve KV209 to discharge a part of unnecessary gas in the forward direction, the pressure of the tower A is further reduced, and the pressure in the tower is reduced to 0.18MPa.
Closing the valve KV209; valve KV209 is fourth valve 15.
3. Pressure drop across
Opening KV203d;
the residual gas of the tower A is connected with the tower D through valves KV203a and KV203D by an outlet end to perform pressure balance, and the pressure of the tower A is reduced again until the pressures of the two towers are basically equal. The KV203a and KV203d are closed.
4. Replacement of
Opening KV207a and KV202a;
after the temperature of the partial gas separated from the outlet of the product gas compressor 22 is reduced, the partial gas enters the tower A from the KV207a by controlling the flow, flows out from the top KV202a and returns to the raw gas compressor 9, the tower A is replaced, and the KV207a and the KV202a are closed after the replacement is finished.
5. Reverse pressure release
Opening the valve KV205a;
and after the balance depressurization step of the tower A, discharging the residual gas in the tower from the inlet end of the tower bottom, discharging the residual gas to V202 until the pressure of the tower A is close to normal pressure, reversely releasing and desorbing the gas to remove the product gas compressor 22, and closing the KV205a after the reverse release is finished.
6. Vacuumizing
Opening valve KV206a;
after the tower A is reversely placed, part of impurities still remain in the adsorbent, and a valve KV206a is opened; the tower A is connected with a vacuum pump 23, and is vacuumized to thoroughly regenerate the adsorbent, and vacuumized desorption gas is discharged to a product gas compressor 22.
Closing the valve KV206a after vacuumizing is finished;
7. pre-boosting
After the vacuumizing is finished, opening a valve KV210 and KV205a; the tower A is pre-pressurized, the gas of V201 is connected with the tower A through valves KV210 and KV205a to perform pressure balance, part of effective gas is recovered, and KV210 and KV205a are closed after the pre-pressurization is finished. Valve KV210 is fifth valve 18.
8. Pressure equalization and rising
Opening valves KV203a and KV203d;
and the tower A is connected with the tower D for pressure balance, and the pressure of the tower A is increased until the pressures of the two towers are basically equal.
9. Final boost pressure
Continuing to open the valve KV203a, opening the valve KV208, and closing the valve KV203d;
the final pressure boost of the A tower is carried out by using outlet gas, and the outlet gas enters the A tower from the outlet end of the tower top through KV208, so that the final pressure of the A tower is basically close to the adsorption pressure. After this step, the regeneration process is completely ended, immediately followed by the next cycle.
The other five columns are operated in the same manner as column a, but offset in time from each other.
The program-controlled valves are operated according to a set program, so that raw material gas is continuously purified in the pressure swing adsorption process, desorption product gas is output, tail gas compressed in the device is dehydrated and pressurized to 0.4-0.45 MPa by the equipment, the tail gas enters a six-tower for uninterrupted operation, CO2 is adsorbed in an adsorbent, and impurity gas is discharged from the top of the tower. The desorption gas at the bottom of the tower is compressed again finally, and the product gas enters the buffer tank 21 and is discharged as the product gas. The concentration of the product gas CO2 is more than or equal to 98.0 percent, and the recovery rate of CO2 is more than or equal to 85 percent. The utility model is characterized in that: wherein, the valve KV210 is introduced into the tower from the lower part by utilizing high-purity CO2 remained in the buffer tank 21; the valve can improve the yield of CO2 of the whole device, and the part of the residual gas which is introduced into the raw gas compressor 9 is reduced, so that the electricity consumption of the raw gas compressor 9 is reduced, and the production is more economical. Buffer tank 21 is a V201 buffer tank.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (6)
1. The carbon dioxide purifying device is characterized by comprising a feed gas compression unit, a pressure swing adsorption purifying unit and a carbon dioxide pressurizing unit;
the raw gas compression unit comprises a raw gas compressor;
the pressure swing adsorption purification units are multiple groups, and the multiple groups of pressure swing adsorption purification units are sequentially communicated; the feed gas compressor is communicated with the pressure swing adsorption purification unit positioned at the head end;
the carbon dioxide pressurizing unit comprises a carbon dioxide compressor communicated with the pressure swing adsorption purification unit at the tail end, and a vacuum pump is arranged between the carbon dioxide compressor and the pressure swing adsorption purification unit at the tail end; the pressure swing adsorption purification unit comprises an adsorption tower, a raw material gas inlet valve, a replacement gas outlet valve, a control pressure control valve, a product gas outlet valve, a pre-pressure boosting reverse discharge valve, a vacuumizing valve and a replacement gas inlet valve;
the replacement air outlet valve, the pressure control valve and the product air outlet valve are sequentially communicated, and the product air outlet valve is communicated with the top of the adsorption tower;
the feed gas inlet valve, the pre-pressure boosting reverse discharge valve, the vacuumizing valve and the replacement air inlet valve are sequentially communicated, and the feed gas inlet valve is communicated with the bottom of the adsorption tower;
feed gas inlet valves respectively positioned in the multiple groups of pressure swing adsorption purification units are sequentially communicated;
the replacement air outlet valves respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
the pressure control valves respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
product gas outlet valves respectively positioned in the multiple groups of pressure swing adsorption purification units are sequentially communicated;
the pre-pressure boosting reverse discharge valves respectively positioned in the multiple groups of pressure swing adsorption purification units are sequentially communicated;
the vacuumizing valves respectively positioned in the multiple groups of pressure swing adsorption purification units are sequentially communicated;
the replacement air inlet valves respectively positioned in the multiple groups of pressure swing adsorption purification units are communicated in sequence;
a feed gas inlet valve in the pressure swing adsorption purification unit at the head end is communicated with the feed gas compressor;
the output end of a replacement air outlet valve in the pressure swing adsorption purification unit at the tail end is communicated with an air storage tank, and a second pneumatic regulating valve is arranged between the air storage tank and the replacement air outlet valve;
the output end of the air storage tank is provided with a raw material removing compressor.
2. A carbon dioxide purifying apparatus according to claim 1, wherein,
a first valve is arranged between the output end of the air storage tank and the raw material removing compressor.
3. A carbon dioxide purifying apparatus according to claim 2, wherein,
the pressure control valve and the product gas outlet valve in the pressure swing adsorption purification unit at the tail end are communicated through a second valve;
a third valve is arranged between the output end of the air storage tank and the first valve;
the communication part of the pressure control valve and the second valve is communicated with the third valve;
a fourth valve is arranged between the pressure control valve and the third valve;
the communication part of the product gas outlet valve and the second valve is provided with a first pneumatic adjusting valve, and the first pneumatic adjusting valve is communicated with the third valve through a pipeline.
4. A carbon dioxide purifying apparatus according to claim 3, wherein,
the output end of the pre-boosting reverse discharge valve in the pressure swing adsorption purification unit at the tail end is communicated with a buffer tank, and a third pneumatic regulating valve is arranged between the pre-boosting reverse discharge valve in the pressure swing adsorption purification unit at the tail end and the buffer tank.
5. A carbon dioxide purifying apparatus according to claim 4, wherein,
a fifth valve is communicated between the pre-pressure boosting reverse discharge valve and the third pneumatic adjusting valve in the pressure swing adsorption purification unit at the tail end, and the output end of the fifth valve is communicated with the output end of the first pneumatic adjusting valve.
6. A carbon dioxide purification apparatus according to claim 1, further comprising a product gas compressor,
the output end of the vacuumizing valve in the pressure swing adsorption purification unit at the tail end is provided with a vacuum pump which is communicated with the product gas compressor;
the replacement air inlet valve in the pressure swing adsorption purification unit at the tail end is provided with a fourth pneumatic adjusting valve which is communicated with the product air compressor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321686057.2U CN220424946U (en) | 2023-06-29 | 2023-06-29 | Carbon dioxide purification device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321686057.2U CN220424946U (en) | 2023-06-29 | 2023-06-29 | Carbon dioxide purification device |
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