CN110761966B - Semi-submersible drilling platform fire extinguishing system - Google Patents

Semi-submersible drilling platform fire extinguishing system Download PDF

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Publication number
CN110761966B
CN110761966B CN201910975505.2A CN201910975505A CN110761966B CN 110761966 B CN110761966 B CN 110761966B CN 201910975505 A CN201910975505 A CN 201910975505A CN 110761966 B CN110761966 B CN 110761966B
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China
Prior art keywords
fire
pump
main
water pressure
water
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CN110761966A (en
Inventor
邹成业
唐志杰
刘永歆
王振宇
范延品
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Dalian Shipbuilding Industry Co Ltd
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Dalian Shipbuilding Industry Co Ltd
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Priority to CN201910975505.2A priority Critical patent/CN110761966B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B35/00—Methods or apparatus for preventing or extinguishing fires
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)

Abstract

The invention discloses a fire fighting system of a semi-submersible drilling platform, which relates to the field of semi-submersible drilling platforms.A variable-frequency fire protection pressure maintaining pump and two directly-started main fire fighting pumps are respectively arranged on the port and the starboard of the semi-submersible drilling platform, and a first water pressure sensor is arranged at the output port of the fire protection pressure maintaining pump and used for measuring the pressure of fire protection water; fire control is protected pressure pump and main fire pump and is connected in fire water loop simultaneously, and fire water loop sets up second water pressure sensor. The control system automatically adjusts the rotating speed of the fire-fighting pressure maintaining pump according to the preset logic and the pressure value of the first water pressure sensor, so that the fire-fighting pipeline is kept at the proper water pressure. If the fire-fighting subsystem starts, or the fire-fighting pipeline leaks, resulting in that water pressure continuously drops, control system will automatically open and stop main fire pump according to preset logic, according to second water pressure sensor's pressure value, supplyes fire-fighting water.

Description

Semi-submersible drilling platform fire extinguishing system
Technical Field
The invention relates to a fire-fighting system of a semi-submersible drilling platform, in particular to a fire-fighting system of a semi-submersible drilling platform.
Background
The fire protection system is used as an active fire protection system and is of great importance to the safety of the semi-submersible drilling platform. The fire pump is the core equipment of the fire-fighting system and is responsible for providing water sources for water-based fire-fighting subsystems such as a fire hydrant, a water mist system and a water spraying system. The classification society specifications generally only pay attention to basic conditions such as discharge capacity, position and power supply of the fire pump, and the requirements on automatic control logic of the fire pump are only fresh.
Disclosure of Invention
The invention aims to provide a semi-submersible drilling platform fire-fighting system which can provide sufficient fire-fighting water to the maximum extent quickly on the basis of meeting the requirements of classification societies on the fire-fighting system so as to ensure that a fire disaster can be extinguished in time, and has the advantages of simple configuration, intelligent control and reliable logic.
In order to achieve the purpose, the invention adopts the following technical scheme:
a semi-submersible drilling platform fire-fighting system comprises a main fire pump and a fire-fighting pressure maintaining pump, wherein inlets of the main fire pump and the fire-fighting pressure maintaining pump are respectively connected with seawater; the main fire pump is connected with a motor with fixed rotating speed, and the fire protection pressure maintaining pump is connected with a variable frequency motor with adjustable rotating speed; a first water pressure sensor is arranged at an output port of the fire-fighting pressure maintaining pump;
the main fire pump and the fire-fighting pressure maintaining pump have their outlets converged into one main outlet as fire-fighting water, and the main outlet is connected to one fire-fighting water loop with branch pipeline for taking water; a second water pressure sensor is also arranged on the waterproof loop;
the motor, the variable frequency motor, the first water pressure sensor and the second water pressure sensor are all connected to the control system through control lines;
the control method of the control system comprises the following steps:
s1: the control system controls the fire-fighting pressure maintaining pump to be opened at a preset minimum rotating speed n 1;
s2: the control system detects a first water pressure sensor, and if the water pressure detected by the first water pressure sensor is higher than a preset value P1, the control system controls the fire-fighting pressure maintaining pump to continue to be at the lowest rotating speed n 1; if the water pressure detected by the first water pressure sensor is lower than the preset value P1, performing step S3;
s3: the control system controls the fire-fighting pressure maintaining pump to increase the rotating speed according to a preset increment n2, and continues to detect the water pressure P0 detected by the first water pressure sensor after a preset time t 0; if P0< P1, repeat S3; if P0> P1, then S4 is performed;
s4: the control system detects the second water pressure sensor, if the detected water pressure is continuously lower than the preset water pressure P2 within the preset time t1, the main fire pump is controlled to be started until the water pressure detected by the second water pressure sensor is continuously higher than P2 within the preset time t2, and the main fire pump is closed; and repeating S4 when the time elapsed after the main fire pump is turned off exceeds a preset value t 3.
Preferably, the two main fire pumps are connected in parallel and respectively comprise a first main fire pump and a second main fire pump; the outlets of the first main fire pump and the second main fire pump are converged into one strand and connected to a main outlet;
s4, when the control system detects that the water pressure is continuously lower than a preset water pressure P2 within a preset time t1, the control system firstly controls the first main fire pump to be opened, and if the opening fails, the control system controls the second main fire pump to be opened; if the first main fire pump and the second main fire pump are both failed to be opened, the control system sends out an alarm signal.
Preferably, the outlets of the first main fire pump and the second main fire pump are converged into one strand through a branch pipeline to serve as an excess water outlet.
Preferably, the main fire pump and the fire protection and pressure maintenance pump are arranged on the port and the starboard of the semi-submersible drilling platform;
the output ports of the main fire pump and the fire-fighting pressure maintaining pump on the port side are converged into a main output port as fire-fighting water on the port side; the outlets of the main fire pump and the fire-fighting pressure maintaining pump on the starboard are converged into a main outlet of fire-fighting water on the starboard; the main output port of the port side and the main output port of the starboard side are connected to the same fire water loop; the fire fighting water loops are symmetrically distributed relative to the central axis of the port and starboard; the fire water loop is provided with second water pressure sensors on both the port side and the starboard side;
in S4, when the water pressure detected by the second water pressure sensor on the port side is continuously lower than the preset water pressure P2 within the preset time t1, the control system controls the main fire pump on the port side to be turned on; when the water pressure detected by the second water pressure sensor on the starboard is continuously lower than the preset water pressure P2 within the preset time t1, the control system controls the main fire pump on the starboard to be turned on.
Preferably, the fire water loop is provided with a plurality of valves, wherein one valve is positioned between the main output port of the port side and the main output port of the starboard side; and a second water pressure sensor is arranged between every two valves.
Preferably, n1 and n2 are both set to be 5% of the maximum rotating speed of the fire-fighting pressure maintaining pump;
P1＝13～15bar；P2＝10～11bar；
t0＝25～35s；t1＝9～10s；t2＝10～15s；t3＝25～35s。
the invention has the advantages that the control system can automatically, quickly and reasonably control the rotating speed and the starting and stopping of the fire pump by collecting and analyzing the fire extinguishing water pressure value in the fire pipeline according to the preset logic without depending on the interference of personnel, thereby ensuring that the proper water pressure is kept in the fire pipeline and enough water is used for extinguishing fire. And the control system can also directly start the main fire pump according to the fire alarm, and override the conventional automatic control.
Drawings
FIG. 1 is a general schematic view of the fire protection system of the present invention;
FIG. 2 is an enlarged view of a portion of block A of FIG. 1;
FIG. 3 is an enlarged view of a portion of block B of FIG. 1;
FIG. 4 is a schematic diagram of the fire protection holding pressure pump control logic of the present invention;
FIG. 5 is a schematic diagram of the main fire pump control logic of the present invention;
FIGS. 6 and 7 are enlarged, partially broken away, left and right portions of FIG. 4;
fig. 8 and 9 are enlarged, left and right parts of fig. 5 being separated.
In the figure, a main fire pump 11, 1, a main fire pump 12, 2, a main fire pump 13, 3, a main fire pump 14, 4, a fire protection and pressure maintenance pump 21, 1, a fire protection and pressure maintenance pump 22, 2, a first water pressure sensor 31, a second water pressure sensor 32 and a second water pressure sensor.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Fig. 1 to 3 are schematic diagrams of a typical fire protection system of a semi-submersible drilling platform, wherein a variable-frequency fire protection pressure maintaining pump and two directly-started main fire protection pumps are respectively arranged on the port and the starboard, the fire protection pressure maintaining pump is configured by 2X 50%, the main fire protection pump is configured by 4X 50%, and a first water pressure sensor 31 is installed at an output port of the fire protection pressure maintaining pump and used for measuring fire protection water pressure. The fire protection pressure maintaining pump and the main fire protection pump are simultaneously connected to a fire protection water loop, and the fire protection water loop is provided with a second water pressure sensor 32. The control system automatically adjusts the rotating speed of the fire protection pressure maintaining pump according to the preset logic and the pressure value of the first water pressure sensor 31(PT-01/02) so as to keep the proper water pressure in the fire protection pipeline. If the fire-fighting subsystem is started or the fire-fighting pipeline leaks, so that the water pressure continuously drops, the control system automatically starts and stops the main fire-fighting pump according to preset logic according to the pressure value of the second water pressure sensor 32(PT-03/04/05/06) to supplement fire-fighting water. When the control system receives the fire alarm signal, the main fire pump can be directly started to override the conventional automatic control.
The method comprises the following steps:
(1) fire control pressure maintaining pump control logic
Manually starting the No. 1 fire-fighting pressure-maintaining pump 21, checking the pressure value of a sensor PT-01 by a control system, and if the pressure value is more than or equal to 14.0bar, keeping the No. 1 fire-fighting pressure-maintaining pump 21 at the lowest rotation speed of 5%; if the pressure value is less than 14.0bar, the rotating speed of the No. 1 fire-fighting pressure-maintaining pump 21 is increased, the control system checks the pressure value of the sensor PT-01 again after the fire-fighting pipeline is stabilized for 30 seconds, and if the pressure value is still less than 14.0bar, the rotating speed of the No. 1 fire-fighting pressure-maintaining pump 21 is increased again, the speed increasing amplitude is 5% of the maximum rotating speed each time until the pressure value of the sensor PT-01 is more than or equal to 14.0 bar. The control logic of the fire protection pressure maintaining pump No. 2 is the same, and the detailed control logic is shown in the control flow chart of the fire protection pressure maintaining pump in FIG. 2.
(2) Main fire pump control logic
The main fire pump stops under normal conditions, and the fire fighting water pressure is maintained by the fire fighting pressure maintaining pump. Meanwhile, the control system checks the pressure values of the sensors PT-03 and PT-05, and if the pressure values of the two sensors are more than or equal to 10.2bar within 15 seconds continuously, the No. 1 main fire pump 11 and the No. 2 main fire pump 12 are still in a stop state; if the pressure value of any sensor is less than 10.2bar within 10 seconds continuously, the control system automatically starts the No. 1 main fire pump 11. After starting for 10 seconds, checking the running state of the No. 1 main fire pump 11, and if the starting fails, directly and automatically starting the No. 2 main fire pump 12 by the control system; if the start is successful, the control system again checks the pressure values of the sensors PT-03 and PT-05. If the pressure values of the two sensors are greater than or equal to 10.2bar within 15 seconds continuously, the control system stops the No. 1 main fire pump 11; if the pressure value of any sensor is less than 10.2bar within 10 seconds continuously, the control system automatically starts the main fire pump No. 2 12. Then, the control system again performs the check of the running state of the main fire pump and the check of the pressure values of the sensors PT-03 and PT-05. If the pressure values of the two sensors are greater than or equal to 10.2bar within 15 seconds continuously, the control system stops the No. 2 main fire pump 12; if the pressure value of any sensor is less than 10.2bar within 10 seconds continuously, which belongs to the abnormal state of the system, the safety control station will send out audible and visual alarm, and the intervention of the operator is carried out. The control logic of the No. 3 main fire pump 13 and the No. 4 main fire pump 14 is the same. In addition, when the control system receives the fire alarm signal, the main fire pump can be directly started to override the conventional automatic control, and the specific control logic is detailed in a control flow chart of the main fire pump in fig. 3.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims (6)

1. A fire-fighting system of a semi-submersible drilling platform is characterized by comprising a main fire pump and a fire-fighting pressure maintaining pump, wherein inlets of the main fire pump and the fire-fighting pressure maintaining pump are respectively connected with seawater; the main fire pump is connected with a motor with fixed rotating speed, and the fire protection pressure maintaining pump is connected with a variable frequency motor with adjustable rotating speed; a first water pressure sensor is arranged at an output port of the fire-fighting pressure maintaining pump;
the main fire pump and the fire-fighting pressure maintaining pump have their outlets converged into one main outlet as fire-fighting water, the main outlet is connected to one fire-fighting water loop, and the fire-fighting water loop is connected with branch pipeline for taking water; a second water pressure sensor is also arranged on the waterproof loop;
the motor, the variable frequency motor, the first water pressure sensor and the second water pressure sensor are all connected to a control system through control lines;
the control method of the control system comprises the following steps:
s1: the control system controls the fire-fighting pressure maintaining pump to be opened at a preset minimum rotating speed n 1;
s2: the control system detects a first water pressure sensor, and if the water pressure detected by the first water pressure sensor is higher than a preset value P1, the control system controls the fire protection pressure maintaining pump to continue to be at the lowest rotating speed n 1; if the water pressure detected by the first water pressure sensor is lower than a preset value P1, performing step S3;
s3: the control system controls the fire fighting pressure maintaining pump to increase the rotating speed according to a preset increment n2, and continues to detect the water pressure P0 detected by the first water pressure sensor after a preset time t 0; if P0< P1, repeat S3; if P0> P1, then S4 is performed;
s4: the control system detects the second water pressure sensor, if the detected water pressure is continuously lower than a preset water pressure P2 within a preset time t1, the main fire pump is controlled to be started until the water pressure detected by the second water pressure sensor is continuously higher than P2 within a preset time t2, and the main fire pump is stopped; and repeating S4 after the time elapsed after the main fire pump is turned off exceeds a preset value t 3.
2. The semi-submersible drilling platform fire protection system of claim 1, wherein the main fire pumps are provided in two in parallel, a first main fire pump and a second main fire pump, respectively; the outlets of the first main fire pump and the second main fire pump are converged and connected with the main outlet;
s4, when the control system detects that the water pressure is continuously lower than a preset water pressure P2 within a preset time t1, the control system firstly controls the first main fire pump to be started, and if the opening fails, the control system controls the second main fire pump to be started; and if the first main fire pump and the second main fire pump are both failed to be opened, the control system sends out an alarm signal.
3. The semi-submersible drilling platform fire protection system of claim 2, wherein the outlets of the first and second main fire pumps further merge into one through a branch line as an excess water outlet.
4. The semi-submersible rig fire protection system of claim 1 or 2, wherein the main fire pump and the fire protection booster pump are disposed both port and starboard of the semi-submersible rig;
the output ports of the main fire pump and the fire-fighting pressure maintaining pump on the port side are converged into a main output port as fire-fighting water on the port side; the outlets of the main fire pump and the fire-fighting pressure maintaining pump on the starboard are converged into a main outlet of fire-fighting water on the starboard; the main output port of the port side and the main output port of the starboard side are connected to the same fire water loop; the fire fighting water loop is symmetrically distributed relative to the central axis of the port side and the starboard side; the fire water loop is provided with second water pressure sensors on a port and a starboard;
at S4, when the water pressure detected by the second water pressure sensor on the port side is continuously lower than a preset water pressure P2 within a preset time t1, the control system controls a main fire pump on the port side to be turned on; when the water pressure detected by the second water pressure sensor on the starboard is continuously lower than the preset water pressure P2 within the preset time t1, the control system controls the main fire pump on the starboard to be turned on.
5. The semi-submersible drilling platform fire protection system of claim 4, wherein a plurality of valves are disposed on the fire suppression water loop, one of the valves being located between the port side main outlet and the starboard side main outlet; and one second water pressure sensor is arranged between every two valves.
6. The semi-submersible drilling platform fire protection system of claim 1, wherein:
n1 and n2 are both set to be 5% of the maximum rotating speed of the fire protection pressure maintaining pump;
P1＝13～15bar；P2＝10～11bar；
t0＝25～35s；t1＝9～10s；t2＝10～15s；t3＝25～35s。
CN201910975505.2A 2019-10-15 2019-10-15 Semi-submersible drilling platform fire extinguishing system Active CN110761966B (en)

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CN201910975505.2A CN110761966B (en) 2019-10-15 2019-10-15 Semi-submersible drilling platform fire extinguishing system

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CN110761966B true CN110761966B (en) 2021-04-09

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2443048Y (en) * 2000-08-31 2001-08-15 李义 Full-automatic fire control water supplying equipment with constant pressure variable flow pump
CN101672289A (en) * 2008-09-11 2010-03-17 王晓勇 High-low pressure control for discharging pressure of marine fire pump
CN202831068U (en) * 2012-10-18 2013-03-27 天津金兴安科技发展有限公司 Intelligent fire-fighting constant pressure water supply equipment
CN104314135A (en) * 2014-10-24 2015-01-28 上海数恩电气科技有限公司 Multi-split constant-pressure water supply system
CN105569124A (en) * 2016-01-31 2016-05-11 天津市建筑设计院 Variable-frequency adjustable-speed variable-pressure water supply device and control method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011087621A (en) * 2009-10-20 2011-05-06 Nippon Kikai Kogyo Kk Connection method of fire pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2443048Y (en) * 2000-08-31 2001-08-15 李义 Full-automatic fire control water supplying equipment with constant pressure variable flow pump
CN101672289A (en) * 2008-09-11 2010-03-17 王晓勇 High-low pressure control for discharging pressure of marine fire pump
CN202831068U (en) * 2012-10-18 2013-03-27 天津金兴安科技发展有限公司 Intelligent fire-fighting constant pressure water supply equipment
CN104314135A (en) * 2014-10-24 2015-01-28 上海数恩电气科技有限公司 Multi-split constant-pressure water supply system
CN105569124A (en) * 2016-01-31 2016-05-11 天津市建筑设计院 Variable-frequency adjustable-speed variable-pressure water supply device and control method thereof

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