CN114718660B - Working system of turbine carbon dioxide centrifugal compressor unit and driving method thereof - Google Patents
Working system of turbine carbon dioxide centrifugal compressor unit and driving method thereof Download PDFInfo
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- CN114718660B CN114718660B CN202210258145.6A CN202210258145A CN114718660B CN 114718660 B CN114718660 B CN 114718660B CN 202210258145 A CN202210258145 A CN 202210258145A CN 114718660 B CN114718660 B CN 114718660B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
Abstract
The invention belongs to the technical field of chemical equipment, and discloses a working system of a turbine carbon dioxide centrifugal compressor unit, which comprises a carbon dioxide centrifugal compressor unit, a compressor inlet separator, a first-stage cooler, a second-stage cooler, a third-stage cooler and a fourth-stage cooler, wherein the carbon dioxide centrifugal compressor unit is a two-cylinder and four-stage centrifugal compressor consisting of a high-pressure cylinder and a low-pressure cylinder; the gas outlet of the second-stage cooler is communicated with the gas outlet of the first-stage inlet valve through a pipeline and is provided with a first-stage anti-surge valve to form a first-stage anti-surge loop, the gas outlet of the third-stage cooler is communicated with the third-stage compression inlet of the high-pressure cylinder through a pipeline and is provided with a third-stage anti-surge valve to form a third-stage anti-surge loop, and the four-stage compression outlets to the four-stage compression inlets of the high-pressure cylinder are communicated through a pipeline and are provided with four-stage anti-surge valves to form a fourth-stage anti-surge loop. The invention realizes the connection and switching between the carbon dioxide reciprocating machine and the turbine carbon dioxide centrifugal compressor, shortens the carbon dioxide emptying time and reduces the emptying amount.
Description
Technical Field
The invention belongs to the technical field of chemical equipment, and relates to a working system of a turbine carbon dioxide centrifugal compressor unit and a driving method thereof.
Background
In large coal chemical enterprises, a turbine carbon dioxide centrifugal compressor unit is used as core power equipment and mainly provides needed gas quantity and pressure for a gasification device; and when the device is in normal operation, redundant carbon dioxide gas is sent to the liquid carbon dioxide device to produce food-grade liquid carbon dioxide, and the system has no emptying loss. The carbon dioxide amount needed for providing the gasification in the front stage of the gasification device is borne by the carbon dioxide reciprocating machine, and because the carbon dioxide reciprocating machine is driven by a motor to consume higher power and a small amount of lubricating oil is carried in the gas at the compression outlet, the safe and stable operation of the gasification device and the production of the food-grade liquid carbon dioxide by the liquid carbon dioxide device are not facilitated, and the carbon dioxide is only used as a replacement start of the gasification device or as a standby machine; in normal production, the carbon dioxide reciprocating machine needs to be switched into a turbine carbon dioxide centrifugal compressor unit. The turbine carbon dioxide centrifugal unit comprises a turbine and a centrifugal compressor, when the existing carbon dioxide centrifugal compressor is started, a process system of the existing carbon dioxide centrifugal compressor needs to be replaced by carbon dioxide gas, the load of the carbon dioxide reciprocating compressor is reduced, and meanwhile, after the unit is started, the long warm-up time is achieved, and carbon dioxide gas generated during system replacement and warm-up is discharged into the atmosphere, so that recycling of resources is not facilitated. Therefore, a method for starting a turbine carbon dioxide centrifugal compressor unit needs to be optimized, and carbon dioxide emptying time and emptying amount in the starting process are reduced.
Disclosure of Invention
The invention aims to provide a working system and a driving method of a turbine carbon dioxide centrifugal compressor unit, which are used for realizing that the carbon dioxide gas replacement of the turbine carbon dioxide centrifugal compressor is changed from before-supercritical carbon dioxide gas replacement to after-supercritical carbon dioxide gas replacement, realizing that the carbon dioxide reciprocating machine and the turbine carbon dioxide centrifugal compressor are in silently connected and switched, and greatly shortening the carbon dioxide emptying time and reducing the emptying amount.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a working system of a turbine carbon dioxide centrifugal compressor unit, which comprises a carbon dioxide centrifugal compressor unit, a compressor inlet separator, a first-stage cooler, a second-stage cooler, a third-stage cooler and a fourth-stage cooler, wherein the carbon dioxide centrifugal compressor unit is a two-cylinder four-stage centrifugal compressor consisting of a high-pressure cylinder and a low-pressure cylinder; the first-stage cooler is positioned on a pipeline from a first-stage compression outlet to a second-stage compression inlet of the low-pressure cylinder, the second-stage cooler is positioned on a pipeline from a second-stage compression outlet of the low-pressure cylinder to a third-stage compression inlet of the high-pressure cylinder, the third-stage cooler is positioned on a pipeline from a third-stage compression outlet to a fourth-stage compression inlet of the high-pressure cylinder, and the fourth-stage cooler is positioned on a pipeline from a fourth-stage compression outlet to a fourth-stage compression inlet of the high-pressure cylinder;
an inlet pipeline of the compressor inlet separator is respectively connected with carbon dioxide gas and low nitrogen gas, a pipeline of an outlet of the compressor inlet separator connected with a first-stage compression inlet of the low-pressure cylinder is provided with a first-stage inlet valve, a second-stage compression outlet pipeline of the low-pressure cylinder is provided with a second-stage emptying valve, a fourth-stage compression outlet pipeline of the high-pressure cylinder is divided into two paths and is respectively provided with a fourth-stage outlet valve and a fourth-stage outlet pressure regulating valve, and a third-stage compression outlet pipeline of the high-pressure cylinder is divided into three paths and is respectively provided with a third-stage emptying valve, a third-stage outlet pressure regulating valve and a dry gas removing sealing valve;
the gas outlet of the second-stage cooler is communicated with the gas outlet of the first-stage inlet valve through a pipeline and is provided with a first-stage anti-surge valve to form a first-stage anti-surge loop, the gas outlet of the third-stage cooler is communicated with the third-stage compression inlet of the high-pressure cylinder through a pipeline and is provided with a third-stage anti-surge valve to form a third-stage anti-surge loop, and the four-stage compression outlets to the four-stage compression inlets of the high-pressure cylinder are communicated through a pipeline and are provided with four-stage anti-surge valves to form a fourth-stage anti-surge loop.
In one technical scheme, the pipeline is divided into two paths after the three-section outlet pressure regulating valve, one path is used for removing the gasification device, and the other path is used for removing the liquid carbon dioxide device through the liquid carbon dioxide device valve.
The invention also provides a driving method of the working system based on the turbine carbon dioxide centrifugal compressor unit, which comprises the following steps:
a. before the engine is started, a three-section emptying valve, a three-section outlet pressure regulating valve and a four-section outlet valve are closed, and a one-section inlet valve, a one-section anti-surge valve, a three-section anti-surge valve, a four-section anti-surge valve and a four-section outlet pressure regulating valve are opened;
b. the method comprises the steps of (1) throwing dry gas sealing gas and post-positioned isolation gas, opening a low-low nitrogen valve on an inlet pipeline of a compressor inlet separator, replacing a process gas circuit system with low-low nitrogen until the content of combustible gas in the process gas circuit system is less than or equal to 0.5%, keeping the pressure of the process gas circuit system at 20-35 KPa after analysis is qualified, and controlling the pressure of the process gas circuit system by using four sections of outlet valves;
c. starting a turbine carbon dioxide centrifugal compressor unit to enter a low-speed warming-up stage, wherein the pressure of a process gas circuit system is kept at 20-35 KPa in the low-speed warming-up process, and a one-stage anti-surge valve, a three-stage anti-surge valve and a four-stage anti-surge valve are fully opened;
d. after the low-speed warm-up is finished and the rotating speed of the unit smoothly passes through a critical rotating speed zone, the load of the carbon dioxide reciprocating compressor is reduced, a carbon dioxide valve on an inlet pipeline of an inlet separator of the compressor is opened to supplement carbon dioxide, meanwhile, the low nitrogen is slowly closed to withdraw the low nitrogen, and the opening of a four-section outlet pressure regulating valve is opened for system regulation;
e. after the rotating speed of the unit reaches the controllable minimum rotating speed of the speed regulator, the rotating speed of the unit is increased to the normal running rotating speed by manually inputting a numerical value; during the speed increasing process, according to the anti-surge curve and surge line in the unit anti-surge control system pictureThe opening degree of the one-section anti-surge valve, the three-section anti-surge valve, the four-section anti-surge valve and the four-section outlet valve is adjusted by the given point, the actual working point and the pressure and the temperature of each section, so that the inlet flow of the one-section, the three-section and the four-section of the compressor unit is respectively kept at 33000-40000 Nm 3 /h、33000~40000Nm 3 /h、20000~25000Nm 3 Monitoring the three-section outlet pressure and the four-section outlet pressure; cutting a dry gas sealing gas source into process gas when the pressure difference between the three-stage outlet pressure and the dry gas sealing balance pipe of the high-pressure cylinder is more than or equal to 0.35 MPa;
f. after the rotating speed of the standby group reaches the normal operating rotating speed and the three-section outlet pressure and the four-section outlet are raised to the normal pressure, slowly opening the three-section outlet pressure regulating valve to feed air to the gasification device; when the bypass valve of the four-section outlet valve is consistent with the pipe network pressure, opening the four-section outlet valve; after the running pressure of the unit is stable, opening a valve of the liquid carbon dioxide removing device on the three-section outlet pipeline to feed air to the liquid carbon dioxide device, recovering redundant carbon dioxide gas, and completing the starting of the turbine carbon dioxide centrifugal compressor unit.
In one technical scheme, the dry gas sealing gas in the step b adopts high-pressure nitrogen with the pressure of 7.0-8.0 MPa and the temperature of 25-35 ℃, and the post-positioned isolation gas adopts low-pressure nitrogen with the pressure of 0.35-0.55 MPa and the temperature of 25-35 ℃.
In one embodiment, the low-speed warm-up period in step c lasts 45min.
In one technical scheme, the low nitrogen pressure is 20-50 KPa, and the temperature is 25-35 ℃.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the load of the original carbon dioxide reciprocating machine is reduced before the supercritical state of the turbine carbon dioxide centrifugal compressor is changed into the load of the original carbon dioxide reciprocating machine is reduced after the supercritical state, the carbon dioxide gas replacement of the turbine carbon dioxide centrifugal compressor is changed from the supercritical state before the supercritical state to the supercritical state, the silently connection switching between the carbon dioxide reciprocating machine and the turbine carbon dioxide centrifugal compressor is realized, the carbon dioxide emptying time is greatly shortened, the emptying amount is reduced, the rest carbon dioxide gas is sent to the liquid carbon dioxide device, the pressure of the turbine carbon dioxide centrifugal compressor set on the large carbon emission amount can be effectively avoided, the production cost is saved, and the economic benefit is improved.
Drawings
FIG. 1 is a schematic diagram of the working system of the turbine carbon dioxide centrifugal compressor of the present invention.
Wherein, 1 is compressor inlet separator, 2 is one section inlet valve, 3 is one section cooler, 4 is two sections coolers, 5 is one section anti-surge valve, 6 is two sections relief valve, 7 is three sections cooler, 8 is three sections relief valve, 9 is three sections outlet pressure regulating valve, 10 is liquid carbon dioxide device valve, 11 is three sections anti-surge valve, 12 is dry gas removal sealing valve, 13 is four sections cooler, 14 is four sections anti-surge valve, 15 is four sections outlet valve, 16 is four sections outlet pressure regulating valve.
Detailed Description
The following examples are illustrative of the present invention and are not intended to limit the scope of the invention. The technical means used in the examples are conventional means well known to those skilled in the art unless otherwise indicated.
Example 1
As shown in FIG. 1, the working system of the turbine carbon dioxide centrifugal compressor unit comprises a carbon dioxide centrifugal compressor unit, a compressor inlet separator 1, a first-stage cooler 3, a second-stage cooler 4, a third-stage cooler 7 and a fourth-stage cooler 13, wherein the carbon dioxide centrifugal compressor unit is a two-cylinder and four-stage centrifugal compressor consisting of a high-pressure cylinder and a low-pressure cylinder; the first-stage cooler 3 is positioned on a pipeline from a first-stage compression outlet to a second-stage compression inlet of the low-pressure cylinder, the second-stage cooler 4 is positioned on a pipeline from the second-stage compression outlet of the low-pressure cylinder to a third-stage compression inlet of the high-pressure cylinder, the third-stage cooler 7 is positioned on a pipeline from the third-stage compression outlet to a fourth-stage compression inlet of the high-pressure cylinder, and the fourth-stage cooler 13 is positioned on a pipeline from the fourth-stage compression outlet to the fourth-stage compression inlet of the high-pressure cylinder;
the inlet pipeline of the compressor inlet separator 1 is respectively connected with carbon dioxide gas and low nitrogen gas, a pipeline of an outlet of the compressor inlet separator 1 connected with a first-stage compression inlet of a low-pressure cylinder is provided with a first-stage inlet valve 2, a second-stage compression outlet pipeline of the low-pressure cylinder is provided with a second-stage vent valve 6, a fourth-stage compression outlet pipeline of the high-pressure cylinder is divided into two paths and is respectively provided with a fourth-stage outlet valve 15 and a fourth-stage outlet pressure regulating valve 16, a third-stage compression outlet pipeline of the high-pressure cylinder is divided into three paths and is respectively provided with a third-stage vent valve 8, a third-stage outlet pressure regulating valve 9 and a dry gas removing sealing valve 12, the pipeline is divided into two paths after the third-stage outlet pressure regulating valve 9, one path is provided with a gasification device, and the other path is provided with a liquid carbon dioxide removing device valve 10 for removing liquid carbon dioxide device;
the gas outlet of the second-stage cooler 4 is communicated with the outlet of the first-stage inlet valve 2 through a pipeline, a first-stage anti-surge valve 5 is arranged to form a first-stage anti-surge loop, the gas outlet of the third-stage cooler 7 is communicated with the third-stage compression inlet of the high-pressure cylinder through a pipeline, a third-stage anti-surge valve 11 is arranged to form a third-stage anti-surge loop, and the four-stage compression outlets to four-stage compression inlets of the high-pressure cylinder are communicated through a pipeline, and a fourth-stage anti-surge valve 14 is arranged to form a fourth-stage anti-surge loop.
The low nitrogen (pressure is 20-50 KPa, temperature is 25-35 ℃) or low-temperature methanol-washed carbon dioxide from air separation enters a low pressure cylinder of a turbine carbon dioxide centrifugal compressor after passing through a compressor inlet separator 1, the low pressure cylinder is subjected to heat exchange cooling through a first-stage cooler 3 and a second-stage cooler 4 after being subjected to compression lifting, then enters a high pressure cylinder of the turbine carbon dioxide centrifugal compressor, after being subjected to three-stage compression, one part of the low pressure cylinder is directly subjected to gasification device through a three-stage outlet pressure regulating valve 9, the liquid carbon dioxide device is subjected to liquid carbon dioxide device through a liquid carbon dioxide device removing valve 10, the small part of the low pressure cylinder is subjected to dry gas seal through a dry gas seal valve 12 and used as seal gas, and the rest of the gas is subjected to heat exchange cooling through a three-stage cooler 7 and then enters a four-stage compression of the high pressure cylinder and then is sent to a gasification device. For the anti-surge requirement, 3 anti-surge loops are arranged, wherein one anti-surge loop is formed by returning the two-stage outlet gas to the first-stage compression inlet of the low-pressure cylinder through the two-stage anti-surge valve 5 after passing through the two-stage cooler 4; one is an anti-surge loop in which three-section outlet gas passes through a three-section cooler 7 and then returns to a three-section compression inlet through a three-section anti-surge valve 11; the other is an anti-surge loop in which the four-stage outlet gas passes through the four-stage cooler 13 and then returns to the four-stage compression inlet through the four-stage anti-surge valve 14.
The driving method of the working system of the turbine carbon dioxide centrifugal compressor unit comprises the following steps:
before the engine is started, a three-section relief valve 8, a three-section outlet pressure regulating valve 9 and a four-section outlet valve 15 are closed, and a one-section inlet valve 2, a one-section anti-surge valve 5, a three-section anti-surge valve 11, a four-section anti-surge valve 14 and a four-section outlet pressure regulating valve 16 are opened;
the method comprises the steps of feeding dry gas sealed sealing gas (high-pressure nitrogen with the pressure of 7.5MPa and the temperature of 25-35 ℃) and post-positioned isolation gas (low-pressure nitrogen with the pressure of 0.35-0.55 MPa and the temperature of 25-35 ℃) into a gas pipeline of a compressor inlet separator 1, opening a low-low nitrogen valve on the inlet pipeline of the compressor inlet separator 1, replacing a process gas circuit system by low-low nitrogen until the content of combustible gas in the process gas circuit system is less than or equal to 0.5%, keeping the pressure of the process gas circuit system at 20-35 KPa after analysis is qualified, and controlling the pressure of the process gas circuit system by using a four-section outlet valve 15;
starting a turbine carbon dioxide centrifugal compressor unit in a 10:05 part, and performing unit flushing, wherein the turbine carbon dioxide centrifugal compressor unit enters a low-speed warming-up stage (lasting 45 min) in a 10:09 part, and in the low-speed warming-up process, the pressure of a process gas circuit system is kept at 20-35 KPa, and a one-stage anti-surge valve 5, a three-stage anti-surge valve 11 and a four-stage anti-surge valve 14 are fully opened;
after the 10:54-minute low-speed warm-up is finished, the rotational speed of the 10:57-minute unit enters a critical rotational speed zone, and the rotational speed of the 11:02-minute unit smoothly passes through the critical rotational speed zone, the load of the carbon dioxide reciprocating compressor is reduced, a carbon dioxide valve on an inlet pipeline of the inlet separator 1 of the compressor is opened to supplement carbon dioxide gas, meanwhile, the low nitrogen is slowly closed to exit from the low nitrogen, and the opening of the four-section outlet pressure regulating valve 16 is opened for system regulation;
after the rotating speed of the 11:12 sub-unit reaches the controllable minimum rotating speed of the speed regulator, the rotating speed of the sub-unit is increased to the normal operating rotating speed by manually inputting a numerical value; in the process of rising speed, according to the anti-surge curve, surge line, given point, actual working point and pressure and temperature of each section in the picture of the unit anti-surge control system, one-section anti-surge valve 5, three-section anti-surge valve 11, four-section anti-surge valve 14 and four-section outlet valve15, so that the inlet flow rates of one section, three sections and four sections of the compressor unit are respectively kept at 33000-40000 Nm 3 /h、33000~40000Nm 3 /h、20000~25000Nm 3 Monitoring the three-section outlet pressure and the four-section outlet pressure; the pressure difference between the outlet pressure of the third section and the dry gas sealing balance pipe of the high-pressure cylinder is more than or equal to 0.35MPa, and the dry gas sealing gas source is cut into process gas;
the rotating speed of the standby group reaches the normal operation rotating speed, and after the three-section outlet pressure and the four-section outlet are raised to the normal pressure, the three-section outlet pressure regulating valve 9 is slowly opened to feed air to the gasification device; when the bypass valve of the four-section outlet valve 15 valve is consistent with the pipe network pressure, opening the four-section outlet valve 15; after the running pressure of the unit is stable, opening a valve 10 of the liquid carbon dioxide removing device on the three-section outlet pipeline to feed air to the liquid carbon dioxide device, recovering redundant carbon dioxide gas, and completing the starting of the turbine carbon dioxide centrifugal compressor unit.
The whole driving process is that the carbon dioxide reciprocating machine is in mercy connection with the turbine carbon dioxide centrifugal compressor, so that the carbon dioxide emptying time is greatly shortened, the emptying amount is reduced, the rest carbon dioxide gas is timely sent to the liquid carbon dioxide device, the pressure of the turbine carbon dioxide centrifugal compressor on large carbon emission during driving can be effectively avoided, the production cost is saved, and the economic benefit is improved.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and other embodiments can be easily made by those skilled in the art through substitution or modification according to the technical disclosure in the present specification, so that all changes and modifications made in the principle of the present invention shall be included in the scope of the present invention.
Claims (3)
1. The method for starting a working system of a turbine carbon dioxide centrifugal compressor unit is characterized in that the working system comprises the carbon dioxide centrifugal compressor unit, a compressor inlet separator (1), a first-stage cooler (3), a second-stage cooler (4), a third-stage cooler (7) and a fourth-stage cooler (13), and the carbon dioxide centrifugal compressor unit is a two-cylinder and four-stage centrifugal compressor consisting of a high-pressure cylinder and a low-pressure cylinder; the first-stage cooler (3) is positioned on a pipeline from a first-stage compression outlet to a second-stage compression inlet of the low-pressure cylinder, the second-stage cooler (4) is positioned on a pipeline from the second-stage compression outlet of the low-pressure cylinder to a third-stage compression inlet of the high-pressure cylinder, the third-stage cooler (7) is positioned on a pipeline from the third-stage compression outlet to a fourth-stage compression inlet of the high-pressure cylinder, and the fourth-stage cooler (13) is positioned on a pipeline from the fourth-stage compression outlet to the fourth-stage compression inlet of the high-pressure cylinder;
an inlet pipeline of the compressor inlet separator (1) is respectively connected with carbon dioxide gas and low nitrogen gas, a pipeline of an outlet of the compressor inlet separator (1) connected with a first-stage compression inlet of the low-pressure cylinder is provided with a first-stage inlet valve (2), a second-stage compression outlet pipeline of the low-pressure cylinder is provided with a second-stage vent valve (6), a fourth-stage compression outlet pipeline of the high-pressure cylinder is divided into two paths and is respectively provided with a fourth-stage outlet valve (15) and a fourth-stage outlet pressure regulating valve (16), and a third-stage compression outlet pipeline of the high-pressure cylinder is divided into three paths and is respectively provided with a third-stage vent valve (8), a third-stage outlet pressure regulating valve (9) and a dry gas removing sealing valve (12); the pipeline is divided into two paths after the three-section outlet pressure regulating valve (9), one path is used for removing the gasification device, and the other path is used for removing the liquid carbon dioxide device through the liquid carbon dioxide device removing valve (10);
the gas outlet of the second-stage cooler (4) is communicated with the outlet of the first-stage inlet valve (2) through a pipeline, a first-stage anti-surge valve (5) is arranged to form a first-stage anti-surge loop, the gas outlet of the third-stage cooler (7) is communicated with the third-stage compression inlet of the high-pressure cylinder through a pipeline, a third-stage anti-surge valve (11) is arranged to form a third-stage anti-surge loop, and the four-stage compression outlets to four-stage compression inlets of the high-pressure cylinder are communicated through a pipeline and four-stage anti-surge valves (14) are arranged to form a fourth-stage anti-surge loop;
the driving method comprises the following steps:
a. before the engine is started, a three-section emptying valve (8), a three-section outlet pressure regulating valve (9) and a four-section outlet valve (15) are closed, and a one-section inlet valve (2), a one-section anti-surge valve (5), a three-section anti-surge valve (11), a four-section anti-surge valve (14) and a four-section outlet pressure regulating valve (16) are opened;
b. the method comprises the steps of (1) using sealing gas sealed by dry gas and post-positioned isolation gas, opening a low-low nitrogen valve on an inlet pipeline of a compressor inlet separator (1), replacing a process gas circuit system by using low-low nitrogen until the content of combustible gas in the process gas circuit system is less than or equal to 0.5%, keeping the pressure of the process gas circuit system at 20-35 KPa after analysis is qualified, and controlling the pressure of the process gas circuit system by using a four-section outlet valve (15); the pressure of the low nitrogen is 20-50 KPa, and the temperature is 25-35 ℃;
c. starting a turbine carbon dioxide centrifugal compressor unit to enter a low-speed warming-up stage, wherein the pressure of a process gas circuit system is kept at 20-35 KPa in the low-speed warming-up process, and a one-stage anti-surge valve (5), a three-stage anti-surge valve (11) and a four-stage anti-surge valve (14) are fully opened;
d. after the low-speed warm-up is finished and the rotating speed of the unit smoothly passes through a critical rotating speed zone, the load of the carbon dioxide reciprocating compressor is reduced, a carbon dioxide valve on an inlet pipeline of an inlet separator (1) of the compressor is opened to supplement carbon dioxide gas, meanwhile, the low nitrogen is slowly closed to exit the low nitrogen, and the opening of a four-section outlet pressure regulating valve (16) is opened for system regulation;
e. after the rotating speed of the unit reaches the controllable minimum rotating speed of the speed regulator, the rotating speed of the unit is increased to the normal running rotating speed by manually inputting a numerical value; in the process of increasing the speed, the opening degrees of one-section anti-surge valve (5), three-section anti-surge valve (11), four-section anti-surge valve (14) and four-section outlet valve (15) are adjusted according to an anti-surge curve, a surge line, a given point, an actual working point and pressures and temperatures of all sections in a picture of a unit anti-surge control system, so that the inlet flow rates of one-section, three-section and four-section of the compressor unit are respectively kept at 33000-40000 Nm 3 /h、33000~40000Nm 3 /h、20000~25000Nm 3 Monitoring the three-section outlet pressure and the four-section outlet pressure; cutting a dry gas sealing gas source into process gas when the pressure difference between the three-stage outlet pressure and the dry gas sealing balance pipe of the high-pressure cylinder is more than or equal to 0.35 MPa;
f. after the rotating speed of the standby group reaches the normal running rotating speed and the three-section outlet pressure and the four-section outlet are raised to the normal pressure, slowly opening a three-section outlet pressure regulating valve (9) to feed air to the gasification device; when the bypass valve of the four-section outlet valve (15) valve is consistent with the pipe network pressure, opening the four-section outlet valve (15); after the running pressure of the unit is stable, a valve (10) of the liquid carbon dioxide removing device on the three-section outlet pipeline is opened to feed air to the liquid carbon dioxide device, the redundant carbon dioxide gas is recovered, and the turbine carbon dioxide centrifugal compressor unit is started.
2. The method according to claim 1, wherein the dry gas sealing gas in the step b is high-pressure nitrogen gas with a pressure of 7.0-8.0 mpa and a temperature of 25-35 ℃, and the post-isolation gas is low-pressure nitrogen gas with a pressure of 0.35-0.55 mpa and a temperature of 25-35 ℃.
3. The method of driving a vehicle according to claim 1, wherein the low-speed warm-up period time in step c lasts 45 minutes.
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| CN104501443A (en) * | 2014-12-10 | 2015-04-08 | 中石化宁波工程有限公司 | Ammonia flash-evaporation cooling process |
| CN206429370U (en) * | 2016-12-29 | 2017-08-22 | 武汉钢铁有限公司 | A kind of automatic compression device |
| CN109026801A (en) * | 2018-07-20 | 2018-12-18 | 西安陕鼓动力股份有限公司 | A kind of single shaft Systems of Centrifugal Compressor Unit and low energy consumption operating method |
| CN109667633A (en) * | 2019-01-07 | 2019-04-23 | 苏州欧拉透平机械有限公司 | Energy output system and method applied to urea plant |
| CN210981753U (en) * | 2019-11-28 | 2020-07-10 | 中国科学院工程热物理研究所 | Double-closed indirect cooling compressor experiment system |
| CN211501046U (en) * | 2020-01-19 | 2020-09-15 | 山东东方华龙工贸集团有限公司 | Rich gas pressurizing and conveying device of fractionating tower |
| CN214118515U (en) * | 2020-11-26 | 2021-09-03 | 中盐华能储能科技有限公司 | Backflow system of multi-section series compressor for energy storage |
| CN113187573A (en) * | 2021-05-17 | 2021-07-30 | 西安热工研究院有限公司 | Supercritical carbon dioxide power generation coaxial integrated equipment and displacement type energy storage method |
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