CN115853612A - Power generation mode and bypass mode switching control method of LNG cold energy power generation device - Google Patents
Power generation mode and bypass mode switching control method of LNG cold energy power generation device Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 46
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000001294 propane Substances 0.000 claims abstract description 44
- 239000006200 vaporizer Substances 0.000 claims abstract description 29
- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 230000001276 controlling effect Effects 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 23
- 239000013535 sea water Substances 0.000 claims description 16
- 239000003949 liquefied natural gas Substances 0.000 description 68
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- 230000008569 process Effects 0.000 description 10
- 239000003345 natural gas Substances 0.000 description 8
- 238000002309 gasification Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to a method for controlling switching between a power generation mode and a bypass mode of an LNG cold energy power generation device, which comprises a method for controlling switching from the bypass mode to the power generation mode, and specifically comprises the following steps: determining that the LNG cold energy power generation device is in a stable bypass mode; the LNG inlet flow rate is reduced; closing the propane pump bypass valve and the turbine large bypass valve, and opening the turbine small bypass valve; adjusting shell pressure of the LNG vaporizer E2 by using a turbine small bypass valve; opening a flow regulating valve, and starting a propane circulating pump at the minimum flow; the valve is switched to PID control; gradually opening an LNG inlet flow control valve, and opening a turbine inlet guide vane IGV and a turbine starting valve, wherein the turbine starting valve is controlled by PID; fully opening a turbine starting valve, and slowly opening a turbine inlet quick-closing valve; closing the turbine starting valve and the turbine small bypass valve; and the IGV of the inlet guide vane of the turbine is controlled by PID, and the operation is stable in a waiting power generation mode.
Description
Technical Field
The invention relates to a power generation mode and bypass mode switching control method of an LNG cold energy power generation device, and belongs to the technical field of cold energy power generation.
Background
The natural Gas is compressed and cooled to its freezing point temperature to form Liquefied Natural Gas (LNG) to save materials and space during storage and transportation. In the process of converting liquid state into normal temperature gas state, LNG can release a large amount of cold energy outwards, and one way of reasonably recycling the energy is cold energy power generation.
Due to the mature and simple process flow, high system reliability and low energy consumption, the Rankine cycle method is one of cold energy power generation technologies commonly used at the present stage. The LNG receives heat from the seawater via the intermediate heat transfer medium propane to achieve vaporization. The propane liquefied by absorbing the cold energy is heated and gasified by the seawater and then drives a turbine connected with a generator set, so that the cold energy power generation is realized.
Although the existing LNG cold energy power generation device realizes the combination of LNG gasification and power generation functions, the existing LNG cold energy power generation device lacks how to realize the switching control flow between two operation modes, so a detailed and reasonable switching control scheme of a power generation mode and a bypass mode is needed.
Disclosure of Invention
In order to solve the problems, the invention provides a power generation mode and bypass mode switching control method for an LNG cold energy power generation device, which describes the opening and closing sequence and opening degree of a valve and important equipment inlet and outlet process parameters in the switching process in detail and ensures that the switching between the power generation mode and the bypass mode can be completed smoothly and safely.
In order to realize the purpose, the invention adopts the following technical scheme:
a control method for switching a power generation mode and a bypass mode of an LNG cold energy power generation device comprises a control method for switching the power generation mode to the bypass mode and a control method for switching the bypass mode to the power generation mode, wherein the control method for switching the bypass mode to the power generation mode comprises the following steps:
s1: determining that the LNG cold energy power generation device is in a stable bypass mode;
s2: the LNG inlet flow rate is reduced;
s3: closing a propane pump bypass valve and a turbine large bypass valve, and opening a turbine small bypass valve;
s4: adjusting shell pressure of the LNG vaporizer E2 by using a turbine small bypass valve;
s5: opening a flow regulating valve, and starting a propane circulating pump at the minimum flow;
s6: the valve is switched to PID control;
s7: gradually opening an LNG inlet flow control valve, and opening a turbine inlet guide vane IGV and a turbine starting valve, wherein the turbine starting valve is controlled by a PID (proportion integration differentiation);
s8: fully opening a turbine starting valve, and slowly opening a turbine inlet quick-closing valve;
s9: closing the turbine starting valve and the turbine small bypass valve;
s10: PID control is adopted for the IGV of the inlet guide vane of the turbine, and the operation is stable when the power generation mode is waited;
the control method for switching the power generation mode to the bypass mode comprises the following steps:
step 1: determining that the LNG cold energy power generation device is in a stable power generation mode;
and 2, step: the LNG inlet flow rate is reduced;
and step 3: slowly closing the IGV of the inlet guide vane of the turbine and opening a small bypass valve of the turbine;
and 4, step 4: closing a turbine inlet quick closing valve, a liquid level regulating valve of the intermediate medium gasifier E1 and a propane circulating pump;
and 5: opening the propane pump bypass valve before the liquid level of the intermediate medium gasifier E1 reaches 0;
step 6: opening the turbine large bypass valve, and starting to close the turbine small bypass valve after confirming that the valve is fully opened;
and 7: gradually opening an LNG inlet flow control valve;
and 8: and waiting for the bypass mode to operate stably.
In the method for controlling switching between the power generation mode and the bypass mode, preferably, the step of placing the LNG cold energy power generation device in the stable bypass mode includes: the LNG inlet flow control valve, the seawater outlet flow control valve, the turbine large bypass valve and the propane pump bypass valve are opened; the turbine small bypass valve, the turbine starting valve, the turbine inlet quick closing valve, the turbine inlet guide vane IGV, the discharge valve, the flow regulating valve, the propane circulating pump and the liquid level regulating valve of the intermediate medium gasifier E1 are closed.
In the method for controlling switching between the power generation mode and the bypass mode, preferably, in S3, the opening of the turbine small bypass valve is adjusted to 5-15%.
In the method for controlling switching between the power generation mode and the bypass mode, preferably, S4 specifically includes the following steps:
s41, keeping the valve opening of the turbine small bypass valve at 5-15% until the pressure of the LNG vaporizer E2 is 0.25-0.75barg;
s42, when the pressure of the LNG vaporizer E2 reaches 0.25-0.75barg, the control is switched to PID control, and the set pressure of the LNG vaporizer E2 is 0.1-0.3barg;
s43 gradually reduces the LNG vaporizer E2 set pressure to 0.1-0.3barg.
In the power generation mode and bypass mode switching control method, preferably, in S6, the opening degree of a liquid level regulating valve of the intermediate medium gasifier E1 is regulated to 30-60%, and after the opening degree of the valve reaches 30-60%, the switching valve is controlled to PID control.
In the method for controlling switching between the power generation mode and the bypass mode, in S7, the opening degree of the turbine inlet guide vane IGV is set to be 5-15%, and the opening degree of the turbine starting valve is set to be 30-60%.
In the method for controlling switching between the power generation mode and the bypass mode, preferably, the LNG cold energy power generation device in the stable power generation mode is: an LNG inlet flow control valve, a seawater outlet flow control valve, a turbine inlet quick-closing valve, a turbine inlet guide vane IGV, a flow control valve, an intermediate medium gasifier E1 liquid level control valve and a propane circulating pump are opened; the turbine starting valve, the turbine small bypass valve, the turbine large bypass valve, the bleed-off valve and the propane pump bypass valve are closed.
Due to the adoption of the technical scheme, the invention has the following advantages:
the control method has the advantages that the control method also considers the auxiliary pipelines and other equipment besides the corresponding pipelines and valves for power generation and bypass of the main process flow. The switching between the power generation mode and the bypass mode can be successfully and safely completed by describing the opening and closing sequence and the opening of the valve and the technological parameters of the inlet and the outlet of important equipment in the switching process in detail.
Drawings
Fig. 1 is a schematic system diagram of an LNG cold energy power generation device according to an embodiment of the present invention;
the respective symbols in the figure are as follows:
1-LNG inlet; 2-normal temperature natural gas outlet; 3-a seawater inlet; 4-a seawater outlet; 5-LNG vaporizer E2; 6-intermediate medium gasifier E1+ natural gas heater E3; 7-a generator; 8-turbine; a 9-propane circulation pump; 10-turbine inlet guide vane IGV; 11-turbine inlet quick closing valve; 12-a bleed valve; 13-a turbine start valve; 14-turbine small bypass valve; 15-turbine large bypass valve; 16-a flow regulating valve; 17-E1 liquid level regulating valve; an 18-propane pump bypass valve; 19-seawater outlet flow control valve; 20-LNG inlet flow control valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the terms "first," "second," "third," "fourth," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The invention provides a switching control method of a power generation mode and a bypass mode of an LNG cold energy power generation device, aiming at the problem that the existing LNG cold energy power generation device realizes the combination of LNG gasification and power generation functions but lacks how to realize the switching control flow between two operation modes.
As shown in fig. 1, the LNG cold power generation apparatus to which the rankine cycle method is applied mainly includes an LNG vaporizer E25, an intermediate medium vaporizer E1+ a natural gas heater E36, a turbine 8, a generator 7, and a propane circulation pump 9.
The intermediate medium gasifier E1+ the natural gas heater E36 in the LNG cold energy power generation device usually appear as a whole, and the heat exchange effect is prevented from being influenced by temperature reduction caused by multiple times of entering and exiting of seawater.
The LNG cold energy power generation device is provided with two conventional operation modes, namely a power generation mode and a bypass mode.
In the power generation mode, the turbine 8 and the propane circulating pump 9 operate, and the system simultaneously realizes the power generation and LNG gasification functions. The liquid propane in the shell side of the intermediate medium gasifier E1 is heated and gasified by the seawater in the tube side, and the gasified propane steam is sent to the inlet of the turbine 8 to drive the turbine 8 to generate electricity. The propane steam enters the shell pass of the LNG vaporizer E25 after expansion and is condensed by the tube pass LNG, and the liquid obtained after cooling enters the propane circulating pump 9 through a pipeline, is pressurized by the propane circulating pump 9, and is sent to the shell pass of the intermediate medium vaporizer E1 again. The LNG is heated by propane in the E2 to be converted into natural gas, then the natural gas is sent into a natural gas heater E3 shell side, heated to a specified temperature by tube side seawater and then output outwards.
In the power generation mode, the liquid level of the intermediate medium vaporizer E1, the shell pressure of the LNG vaporizer E25, the propane circulation pump 9, and the turbine 8 need to be controlled.
In the bypass mode, the turbine 8 and propane circulation pump 9 are not operated and the system performs only the LNG vaporization function. Liquid propane on the shell side of the intermediate medium gasifier E1 is heated and gasified by tube side seawater, propane steam directly enters the shell side of the LNG gasifier E25 and is condensed, and then liquid propane directly enters the shell side of E1 to complete one cycle.
In the bypass mode, propane completes the natural circulation from E2 to E1 by gravity, so E2 is arranged at a higher vertical height than E1. The propane circulation loop is not controlled except for emergency stops, but only LNG and seawater flow rates.
Although the existing LNG cold energy power generation device realizes the combination of the gasification and power generation functions of LNG, the existing LNG cold energy power generation device lacks a control flow for realizing the switching between two operation modes.
The invention provides a switching control method of a power generation mode and a bypass mode of an LNG cold energy power generation device, aiming at the problem that the existing LNG cold energy power generation device lacks a control flow for realizing switching between two operation modes.
Fig. 1 is a schematic system structure diagram of an LNG cold energy power generation apparatus according to an embodiment of the present invention, in this embodiment, the LNG cold energy power generation apparatus has two operation modes, that is, a power generation mode and a bypass mode.
The specific embodiment provides a control scheme for switching the bypass mode to the power generation mode of the LNG cold energy power generation device under a certain case of process value, and the specific process is as follows:
1. ensuring the cold energy power generation device to be in a stable state in a bypass mode, namely determining the opening and closing states of the following valves: opening an LNG inlet flow control valve 20, a seawater outlet flow control valve 19, a turbine large bypass valve 15 and a propane pump bypass valve 18; the turbine small bypass valve 14, the turbine starting valve 13, the turbine inlet quick-closing valve 11, the turbine inlet guide vane IGV10, the bleed valve 12, the flow regulating valve 16, the propane circulation pump 9 and the liquid level regulating valve 17 of the intermediate medium gasifier E1 are closed.
2. The LNG flow rate is adjusted to be reduced from 205.2 tons/hour to 80 tons/hour.
3. Propane pump bypass valve 18 is closed.
4. And completely closing the turbine large bypass valve 15, and adjusting the opening of the turbine small bypass valve 14 to 10%.
5. The shell pressure of the LNG vaporizer E2 is adjusted by a turbine small bypass valve 14 in 3 stages:
A. the valve opening of turbine small bypass valve 14 is maintained at 10% until the LNG vaporizer E2 pressure becomes 0.5barg;
B. when the pressure of the LNG vaporizer E2 reaches 0.5barg, the control is switched to PID control; setting the pressure of LNG vaporizer E2 to 0.2barg;
C. the pressure of LNG vaporizer E2 is set to gradually decrease to 0.2barg.
6. The flow regulating valve 16 is opened to start the propane circulation pump 9 at the minimum flow rate.
7. And adjusting the opening of a liquid level adjusting valve 17 of the intermediate medium gasifier E15 to 50%, and after the opening of the valve reaches 50%, switching the valve control to PID control.
8. Gradually opening the LNG inlet flow control valve 20, and adjusting the flow rate to 205.2 tons/hour;
9. opening a turbine inlet guide vane IGV10, and setting the opening degree to be 10%; the turbo start valve 13 is opened with the opening set to 50%.
10. The turbine starting valve 13 is controlled by PID:
A. controlling turbine start valve 13 to maintain speed 1;
B. the turbine start valve 13 is controlled to maintain the 2 nd speed.
11. The turbine is started by the full open valve 13 and the turbine inlet quick close valve 11 is opened slowly.
12. Turbine start valve 13 and turbine small bypass valve 14 are closed.
13. The turbine inlet guide vane IGV10 is PID controlled to control the pressure of the LNG vaporizer E2 to 0.2barg.
14. And waiting for the stable operation of the power generation mode.
The specific embodiment further provides a control scheme for switching the power generation mode to the bypass mode by using the LNG cold energy power generation device, and the specific flow is as follows:
1. ensuring the cold energy power generation device to be in a stable state under a power generation mode, namely determining the opening and closing states of the following valves: an LNG inlet flow control valve 20, a seawater outlet flow control valve 19, a turbine inlet quick-closing valve 11, a turbine inlet guide vane IGV10, a flow regulating valve 16, a liquid level regulating valve 17 of an intermediate medium gasifier E1 and a propane circulating pump 9 are opened; turbine startup valve 13, turbine small bypass valve 14, turbine large bypass valve 15, bleed valve 12 and propane pump bypass valve 18 are closed.
2. The LNG flow rate is adjusted to be reduced from 205.2 tons/hour to 100 tons/hour.
3. The turbine inlet guide vanes IGV10 are slowly closed and the turbine small bypass valve 14 is opened. To avoid the LNG vaporizer E2 shell becoming vacuum, the opening of the turbine inlet guide vanes IGV10 and the turbine small bypass valve 14 need to be balanced.
4. The turbine inlet quick-closing valve 11 is closed.
5. The liquid level regulating valve 17 of the intermediate medium vaporizer E1 is closed, the propane circulation pump 9 is closed, and the propane pump bypass valve 18 is opened before the liquid level of the intermediate medium vaporizer E1 reaches 0.
6. The turbine large bypass valve 15 is opened, and after the valve is confirmed to be fully opened, the turbine small bypass valve 14 starts to be closed.
7. The LNG inlet flow control valve 20 is gradually opened to make the flow 205.2 tons/hour before the liquid level of the LNG vaporizer E2 reaches 0.
8. And waiting for the bypass mode to operate stably.
The control method has the advantages that the control method considers the auxiliary pipelines and other equipment besides the corresponding pipelines and valves for power generation and bypass of the main process flow. The switching between the power generation mode and the bypass mode can be successfully and safely completed by describing the opening and closing sequence and the opening degree of the valve and the technological parameters of the inlet and the outlet of important equipment in the switching process in detail.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A control method for switching a power generation mode and a bypass mode of an LNG cold energy power generation device comprises a control method for switching the power generation mode to the bypass mode and a control method for switching the bypass mode to the power generation mode, and is characterized in that the control method for switching the bypass mode to the power generation mode comprises the following steps:
s1: determining that the LNG cold energy power generation device is in a stable bypass mode;
s2: the LNG inlet flow rate is reduced;
s3: closing the propane pump bypass valve and the turbine large bypass valve, and opening the turbine small bypass valve;
s4: adjusting shell pressure of the LNG vaporizer E2 by using a turbine small bypass valve;
s5: opening a flow regulating valve, and starting a propane circulating pump at the minimum flow;
s6: the valve is switched to PID control;
s7: gradually opening an LNG inlet flow control valve, and opening a turbine inlet guide vane IGV and a turbine starting valve, wherein the turbine starting valve is controlled by PID;
s8: fully opening a turbine starting valve, and slowly opening a turbine inlet quick-closing valve;
s9: closing the turbine starting valve and the turbine small bypass valve;
s10: PID control is adopted for the IGV of the inlet guide vane of the turbine, and the operation is stable when the power generation mode is waited;
the control method for switching the power generation mode to the bypass mode comprises the following steps:
step 1: determining that the LNG cold energy power generation device is in a stable power generation mode;
step 2: the LNG inlet flow rate is reduced;
and step 3: slowly closing the IGV of the inlet guide vane of the turbine and opening a small bypass valve of the turbine;
and 4, step 4: closing a turbine inlet quick closing valve, a liquid level regulating valve of the intermediate medium gasifier E1 and a propane circulating pump;
and 5: opening the propane pump bypass valve before the liquid level of the intermediate medium gasifier E1 reaches 0;
and 6: opening a turbine large bypass valve, and starting to close a turbine small bypass valve after confirming that the valve is fully opened;
and 7: gradually opening an LNG inlet flow control valve;
and 8: waiting for the bypass mode to operate stably.
2. The power generation mode and bypass mode switching control method according to claim 1, wherein the LNG cold energy power generation device being in the stable bypass mode is: the LNG inlet flow control valve, the seawater outlet flow control valve, the turbine large bypass valve and the propane pump bypass valve are opened; the turbine small bypass valve, the turbine starting valve, the turbine inlet quick closing valve, the turbine inlet guide vane IGV, the discharge valve, the flow regulating valve, the propane circulating pump and the liquid level regulating valve of the intermediate medium gasifier E1 are closed.
3. The power generation mode and bypass mode switching control method according to claim 1, wherein the opening degree of the turbine small bypass valve is adjusted to 5-15% in S3.
4. The method for controlling switching between a power generation mode and a bypass mode according to claim 1, wherein S4 specifically comprises the steps of:
s41, keeping the valve opening of the turbine small bypass valve at 5-15% until the pressure of the LNG vaporizer E2 is 0.25-0.75barg;
s42, when the pressure of the LNG vaporizer E2 reaches 0.25-0.75barg, the control is switched to PID control, and the set pressure of the LNG vaporizer E2 is 0.1-0.3barg;
s43 gradually reduces the LNG vaporizer E2 set pressure to 0.1-0.3barg.
5. The power generation mode and bypass mode switching control method according to claim 1, wherein in S6, the opening degree of the liquid level regulating valve of the intermediate medium vaporizer E1 is adjusted to 30-60%, and after the opening degree of the valve reaches 30-60%, the switching valve control is PID control.
6. The power generation mode and bypass mode switching control method according to claim 1, wherein in S7, the opening degree of the turbine inlet guide vane IGV is set to 5-15%, and the opening degree of the turbine starting valve is set to 30-60%.
7. The power generation mode and bypass mode switching control method according to claim 1, wherein the LNG cold energy power generation device being in the stable power generation mode is: starting an LNG inlet flow control valve, a seawater outlet flow control valve, a turbine inlet quick-closing valve, a turbine inlet guide vane IGV, a flow regulating valve, a middle medium gasifier E1 liquid level regulating valve and a propane circulating pump; the turbine starting valve, the turbine small bypass valve, the turbine large bypass valve, the bleed valve and the propane pump bypass valve are closed.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150127935A (en) * | 2014-05-07 | 2015-11-18 | 현대중공업 주식회사 | A Treatment System Of Liquefied Gas |
| CN105507969A (en) * | 2015-12-16 | 2016-04-20 | 中国海洋石油总公司 | Energy recycling system by using LNG liquifying factory and application method |
| KR20230093851A (en) * | 2021-12-20 | 2023-06-27 | (주)거산 | Manufacturing Apparatus for Unplasticized PVC Pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150127935A (en) * | 2014-05-07 | 2015-11-18 | 현대중공업 주식회사 | A Treatment System Of Liquefied Gas |
| CN105507969A (en) * | 2015-12-16 | 2016-04-20 | 中国海洋石油总公司 | Energy recycling system by using LNG liquifying factory and application method |
| KR20230093851A (en) * | 2021-12-20 | 2023-06-27 | (주)거산 | Manufacturing Apparatus for Unplasticized PVC Pipe |
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