CN220894748U - Non-condensable gas emptying control circuit of carbon dioxide condensate separator - Google Patents
Non-condensable gas emptying control circuit of carbon dioxide condensate separator Download PDFInfo
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- CN220894748U CN220894748U CN202322395379.8U CN202322395379U CN220894748U CN 220894748 U CN220894748 U CN 220894748U CN 202322395379 U CN202322395379 U CN 202322395379U CN 220894748 U CN220894748 U CN 220894748U
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- pipeline
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title abstract description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 title abstract description 8
- 239000001569 carbon dioxide Substances 0.000 title abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 35
- 230000004888 barrier function Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 24
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 239000012071 phase Substances 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 229910001335 Galvanized steel Inorganic materials 0.000 description 4
- 239000008397 galvanized steel Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Control Of Fluid Pressure (AREA)
Abstract
The utility model discloses a non-condensable gas emptying control circuit of a carbon dioxide condensate separator, wherein one path of the output end of the condensate separator is connected with a tail gas incinerator through a pipeline, and a first regulating valve PV-1103A is arranged on the pipeline; the other path is emptied through a pipeline, a second regulating valve PV-1103B is arranged on the pipeline, the output end of the condensate separator is provided with a pressure transmitter PT1103 for collecting pressure signals, and the pressure signals of the pressure transmitter PT1103 are divided into two paths: the first path is connected with the input end of a first control unit PIC1103A, and the output end of the PIC1103A outputs a control signal to be connected with a first regulating valve PV-1103A; the second path is connected with the input end of the second control unit PIC1103B, and the output end of the PIC1103B outputs a control signal and is connected with the second regulating valve PV-1103B. The scheme reduces the times and the quantity of direct emptying of the noncondensable gas to the greatest extent.
Description
Technical Field
The utility model relates to the electrical field, in particular to a non-condensable gas emptying control circuit of a carbon dioxide condensate separator, which is an improvement of an instrument control circuit.
Background
Separating the tail gas from the carbon dioxide purifying and liquefying device by a condensate separator, allowing liquid phase separated oil to enter a separated oil tank, and loading and transporting the separated oil out of a factory; the gas phase noncondensable gas is discharged after being burnt by the tail gas incinerator, so that the normal production operation of the carbon dioxide purifying and liquefying device is ensured.
The noncondensable gas from the condensate separator is divided into two paths, and is normally discharged from the tail gas incinerator and is directly discharged in emergency. The control scheme (with control points, a process flow chart is shown in figure 1) in the prior art uses the gas phase outlet pressure PT1103 of a condensate separator as a regulated parameter, a regulating valve PV-1103A is arranged on a tail gas incinerator pipeline, and another regulating valve PV-1103B is arranged on an emptying pipeline to form a branch regulating system PT1103-PIC1103-PV1103A/PV1103B. When PT1103 is larger than a set value, the regulating valve PV-1103A is firstly opened, and after PV-1103A is fully opened, PV-1103B is started to be opened again; otherwise, when PT1103 is smaller than the set value, regulating valve PV-1103B is closed first, and after PV-1103B is fully closed, PV-1103A is closed again.
The disadvantage of the branch regulating system is that once the operation is not stable enough, when the pressure fluctuation of the gas phase outlet of the condensate separator is large, the condition that noncondensable gas is directly discharged easily occurs, and the standard emission cannot be achieved, so that the normal production operation of the carbon dioxide purifying and liquefying device is influenced. To solve this problem, there is a need to improve the control scheme for direct venting of non-condensable gases from the condensate separator.
Disclosure of utility model
The utility model provides a non-condensable gas emptying control circuit of a carbon dioxide condensate separator, which aims to solve the problems in the background art.
The technical scheme is as follows:
One path of the output end of the condensate separator is connected with the tail gas incinerator through a pipeline, and a first regulating valve PV-1103A is arranged on the pipeline; the other path is emptied through a pipeline, and a second regulating valve PV-1103B is arranged on the pipeline, wherein:
The output end of the condensate separator is provided with a pressure transmitter PT1103 for collecting pressure signals, and the pressure signals of the pressure transmitter PT1103 are divided into two paths:
The first path is connected with the input end of the first control unit PIC1103A, and the output end of the first control unit PIC1103A outputs a control signal and is connected with the first regulating valve PV-1103A;
the second path is connected with the input end of the second control unit PIC1103B, and the output end of the second control unit PIC1103B outputs a control signal and is connected with the second regulating valve PV-1103B.
Preferably, the first control unit PIC1103A is a single loop control unit, and compares with a set threshold value and outputs a control signal.
Preferably, the second control unit PIC1103B is a linear control unit, and outputs a control opening according to a pressure value of the pressure transmitter PT1103 in equal proportion.
Specifically, a 4-20 mA pressure signal output by the pressure transmitter PT1103 is sent to an analog input safety grid PIB1103 in a control room through a cable, the analog input safety grid PIB1103 is divided into two paths through an analog input clamping piece AIMPT, one path of the analog input safety grid PIB1103 enters a first control unit PIC1103A, after single loop adjustment is completed, the analog input safety grid PIB 1103A is output through a first analog output clamping piece AOMPV A, and finally a 4-20 mA control signal is sent to a first adjusting valve PV1103A through the cable for adjustment; the other path enters a second control unit PIC1103B, after linear control is completed, the other path passes through a second analog output clamping piece AOMPV1103B, then passes through a second analog output safety barrier POB1103B, and finally sends a 4-20 mA control signal to a second regulating valve PV1103B for control through a cable.
The beneficial effects of the utility model are that
The PIC-1103A is set to be regulated by a single loop, and the set value and the high alarm value of the PIC-1103A are lower than the minimum value controlled by a PIC-1103B program. If the treatment is not in time, the pressure is continuously increased to reach the minimum value controlled by PIC-1103B program, the direct emptying regulating valve PV-1103B starts to act, and noncondensable gas is directly emptied to ensure the safety of the device. The improved control scheme has the advantage of minimizing the number and amount of direct emptying of the non-condensable gas.
Drawings
FIG. 1 is a process flow diagram with control points at the time of the split-pass adjustment (background art);
FIG. 2 is a flow chart of a process with control points at the time of program control (application);
fig. 3 is a single loop regulated PIC1103A control block diagram;
fig. 4 is a control block diagram of the program control PIC 1103B;
FIG. 5 is a DCS control hardware connection diagram;
FIG. 6 is a pressure transmitter measurement piping connection diagram; (in the figure, a 1-process pressure-taking valve, a 2-measuring pipeline, a 3-stop valve and a 4-pressure transmitter)
FIG. 7 is a connecting diagram of a regulator valve air supply line; (in the figure, 3-stop valve, 6-galvanized steel pipe, 7-air source ball valve, 8-stainless steel pipe, 9-filtration pressure reducer)
Fig. 8 is a simulation plot of a PIC1103B program control scheme.
Detailed Description
The utility model is further illustrated below with reference to examples, but the scope of the utility model is not limited thereto:
The process flow chart with the control points is shown in fig. 2, the regulator PIC-1103 is changed into two regulator first control units PIC-1103A and second control units PIC-1103B, PIC-1103A is single-loop regulation, and PIC-1103B is program control.
The single loop regulated PIC-1103A control block diagram is shown in fig. 3, which shows that it is a closed loop control system. The set value is input into the first control unit PIC-1103A, and an output signal of the first control unit PIC-1103A is sent to the first regulating valve PV-1103A, and the first regulating valve PV-1103A acts on the controlled object. Meanwhile, a pressure transmitter PT1103 is arranged at the output end of the condensate separator to collect pressure signals, and the pressure signals are fed back to an input port of a first control unit PIC-1103A to carry out closed-loop adjustment.
The control block diagram of the program control PIC-1103B is shown in FIG. 4, which shows that it is an open loop control system. The pressure transmitter PT1103 collects pressure signals and inputs the pressure signals to the input end of the second control unit PIC1103B, and the output signals of the second control unit PIC1103B are sent to the second regulating valve PV-1103B for open-loop control.
The control scheme is completed by a device DCS, and the DCS control hardware connection diagram is shown in fig. 5.
A first part: hardware connection
First, the gas phase outlet pressure of the condensate separator is measured by a pressure transmitter, and the connection diagram of the measuring pipeline is shown in fig. 6. Wherein, a measuring pipeline 2 is led out from a process pipeline 5, a process pressure taking valve 1 is arranged at the end of the measuring pipeline 2 near the process pipeline 5, a pressure transmitter 4 is arranged at the other end of the measuring pipeline 2, and a stop valve 3 is arranged on the measuring pipeline 2 to which the pressure transmitter 4 belongs.
Secondly, a 4-20 mA pressure signal output by a pressure transmitter PT1103 is sent to an analog input safety grid PIB1103 in a control room through a cable, the analog input safety grid PIB1103 is divided into two paths after passing through an analog input clamping piece AIMPT, one path of the analog input safety grid PIB1103 enters a control unit PIC1103A, after single loop adjustment is completed, the analog output clamping piece AOMPV A is used for outputting a safety grid POB1103A through an analog, and finally a 4-20 mA control signal is sent to a regulating valve PV1103A through the cable for adjustment; the other path enters the control unit PIC1103B, after program control is completed, the other path passes through the analog output clamping piece AOMPV1103B, then passes through the analog output safety barrier POB1103B, and finally sends a 4-20 mA control signal to the regulating valve PV1103B for control through a cable.
Finally, the regulating valve is a pneumatic regulating valve, and the connection diagram of the air supply pipeline is shown in fig. 7. The gas source is transmitted in a galvanized steel pipe 6, a stop valve 3 is arranged on a main pipeline of the galvanized steel pipe 6, two branches of the galvanized steel pipe 6 are connected into a gas source ball valve 7, the output end of the gas source ball valve 7 is connected with a first control unit PIC-1103A (10-1) through a stainless steel pipe 8, and a filtering pressure reducer 9 is further arranged on the stainless steel pipe 8; the second path is connected with an air source ball valve 7, the output end of the air source ball valve 7 is connected with a second control unit PIC-1103B (10-2) through a stainless steel pipe 8, and a filtering pressure reducer 9 is further arranged on the stainless steel pipe 8.
A second part: DCS system parameter setting
PIC-1103A is single loop regulation, setting value is 100kPa, low alarm is 70kPa, and high alarm is 130kPa.
PIC-1103B is program control, and the control scheme is as follows: when PT1103 is 200kPa, PV1103B is fully closed, and the opening degree is 0; when PT1103 is 250kPa, PV1103B is fully opened, and the opening degree is 100%; the two intermediate points are in one-to-one correspondence and are linearly adjusted as shown in fig. 8.
The gas phase outlet pressure of the condensate separator is set to be 100kPa, the condensate separator is allowed to fluctuate within 70-130 kPa, when the pressure exceeds 130kPa, the DCS gives out high-limit audible and visual alarm, and operators can perform manual emergency treatment to reduce the pressure. If the treatment is not timely or invalid, the pressure continues to rise to 200kPa, the vent regulating valve PV1103B is automatically opened, and the noncondensable gas starts to vent and release pressure, so that the safety of the device is ensured until 250kPa and PV3B are all opened.
After the scheme is implemented, a good effect is obtained in actual production, and the number and amount of direct emptying of the noncondensable gas are greatly reduced.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be performed by hardware associated with instructions via circuit configurations that may be performed by a single chip or other similarly functioning integrated chip, as is known in the art. The core utility model is that the overall structure layout of the system and the local control method can be completed by programming in the prior art; the local module connection can be realized by means of the prior art. In particular, in the utility model, the innovation point is the improvement of the whole control circuit based on the sensor setting, and the utility model belongs to the protection object. The parameter settings of the control unit concerned, which are known to the person skilled in the art, should not be regarded as limiting the protective object of the utility model.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.
Claims (4)
1. One path of the output end of the condensate separator is connected with the tail gas incinerator through a pipeline, and a first regulating valve PV-1103A is arranged on the pipeline; the other path is emptied through a pipeline, and a second regulating valve PV-1103B is arranged on the pipeline, and is characterized in that:
The output end of the condensate separator is provided with a pressure transmitter PT1103 for collecting pressure signals, and the pressure signals of the pressure transmitter PT1103 are divided into two paths:
The first path is connected with the input end of the first control unit PIC1103A, and the output end of the first control unit PIC1103A outputs a control signal and is connected with the first regulating valve PV-1103A;
the second path is connected with the input end of the second control unit PIC1103B, and the output end of the second control unit PIC1103B outputs a control signal and is connected with the second regulating valve PV-1103B.
2. The circuit of claim 1, wherein the first control unit PIC1103A is a single loop control unit, and is configured to compare with a set threshold value and output a control signal.
3. The circuit according to claim 1, characterized in that the second control unit PIC1103B is a linear control unit, outputting a control opening according to a pressure value equal proportion of the pressure transmitter PT 1103.
4. The circuit according to claim 1, wherein the 4-20 mA pressure signal output by the pressure transmitter PT1103 is sent to the analog input safety barrier PIB1103 in the control room through the cable, and is split into two paths after passing through the analog input clamping piece AIMPT, one path enters the first control unit PIC1103A, after completing the single loop adjustment, the signal is sent to the first regulating valve PV1103A through the first analog output clamping piece AOMPV1103A, then the signal is sent to the safety barrier POB1103A through the first analog, and finally the 4-20 mA control signal is sent to the first regulating valve PV1103A through the cable for adjustment; the other path enters a second control unit PIC1103B, after linear control is completed, the other path passes through a second analog output clamping piece AOMPV1103B, then passes through a second analog output safety barrier POB1103B, and finally sends a 4-20 mA control signal to a second regulating valve PV1103B for control through a cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322395379.8U CN220894748U (en) | 2023-09-04 | 2023-09-04 | Non-condensable gas emptying control circuit of carbon dioxide condensate separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322395379.8U CN220894748U (en) | 2023-09-04 | 2023-09-04 | Non-condensable gas emptying control circuit of carbon dioxide condensate separator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220894748U true CN220894748U (en) | 2024-05-03 |
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ID=90843102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322395379.8U Active CN220894748U (en) | 2023-09-04 | 2023-09-04 | Non-condensable gas emptying control circuit of carbon dioxide condensate separator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220894748U (en) |
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2023
- 2023-09-04 CN CN202322395379.8U patent/CN220894748U/en active Active
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