CN214464558U

CN214464558U - LGIP low-speed diesel engine ventilation monitoring system

Info

Publication number: CN214464558U
Application number: CN202022725180.3U
Authority: CN
Inventors: 王勇; 刘闯; 王冬冬; 陈怡然; 赵冬杨
Original assignee: Hudong Heavy Machinery Co Ltd; CSSC MES Diesel Co Ltd
Current assignee: Hudong Heavy Machinery Co Ltd; CSSC MES Diesel Co Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-10-22
Anticipated expiration: 2030-11-23

Abstract

The utility model relates to a diesel oil ventilation detects technical field, and discloses a LGIP low-speed diesel engine ventilation monitoring system, including high negative-pressure air fan A, high negative-pressure air fan B, HC sensor A, HC sensor B, pneumatic valve, check valve, pressure sensor, pneumatic valve, flow switch A, flow switch B, check valve, pneumatic valve, flow switch C and regulation needle valve, its characterized in that: the high negative pressure fan A is connected with the high negative pressure fan B in series, and the upper part of the high negative pressure fan A is connected in parallel. The LGIP low-speed diesel engine ventilation monitoring system is safe when a cabin is used, in order to effectively guarantee the safety of crews, a double-wall pipe design is adopted, an inner pipe is high-risk LPG (liquefied petroleum gas) liquid fuel, ventilation monitoring air circulates in an annular area of the double-wall pipe, a dangerous fuel isolation effect is achieved, and once the high-risk LPG (liquefied petroleum gas) liquid fuel leaks.

Description

LGIP low-speed diesel engine ventilation monitoring system

Technical Field

The utility model relates to a diesel oil ventilation detects technical field, specifically is a LGIP low-speed diesel engine ventilation monitoring system.

Background

International maritime organization IMO is focusing more and more on the emission pollution of low-speed diesel engines, in order to effectively reduce the emission of pollutants such as Sox and particulate matters and reduce the operating cost of ships, more and more dual-fuel host orders are produced in the market, the latest dual-fuel diesel engine is an LGIP low-speed diesel engine, the fuel of the dual-fuel diesel engine is LPG (liquefied petroleum gas), the main components are propane and butane, a small amount of olefin is contained, the lower explosion limit of LPG gas is 1.5% by volume concentration, the ignition concentration is lower and is more dangerous compared with 5% natural gas, the density of LPG in a gaseous state is higher than that of air, and the LPG is easy to accumulate in low-lying positions on the ground when leakage occurs, so the LPG has higher danger and belongs to class a dangerous gas.

SUMMERY OF THE UTILITY MODEL

The not enough of prior art, the utility model provides a LGIP low-speed diesel engine ventilation monitoring system possesses under the high pressure of safe region under-deck LPG (liquefied petroleum gas) leakage monitoring, provides LGIP low-speed diesel engine ventilation monitoring system design and LPG feed system and is in safety monitoring often under, prevents that LPG from revealing the advantage of gathering the incident that causes, has solved the problem that provides among the above-mentioned background art.

The utility model provides a following technical scheme: the utility model provides a LGIP low-speed diesel engine ventilation monitoring system, includes high negative pressure fan A, high negative pressure fan B, HC sensor A, HC sensor B, pneumatic valve 832, pneumatic valve 838, check valve 839, pressure sensor, pneumatic valve 831, flow switch A, flow switch B, check valve, pneumatic valve 833, flow switch C, orifice plate and regulation needle valve, high negative pressure fan A has high negative pressure fan B through establishing ties, high negative pressure fan A's top has orifice plate through parallelly connected, the orifice plate right side have the regulation needle valve through establishing ties, high negative pressure fan A's below has HC sensor A in parallel, HC sensor A's below is provided with HC sensor B, pneumatic valve 832 is installed to HC sensor B's below, high negative pressure fan A, orifice plate, HC sensor A, HC sensor B and pneumatic valve 832 are parallelly connected on same line, the pneumatic valve 838 is connected in series below the pneumatic valve 832, a check valve 839 is arranged on the left side of the pneumatic valve 838, the pneumatic valve 838 is connected in parallel with the check valve 839, and the pneumatic valve 838 and the pneumatic valve 832 are connected in series with a pressure sensor below the pneumatic valve 838.

Preferably, the pneumatic valve 832 is connected with a pneumatic valve 831 in parallel through a control air B, a flow switch a is connected above the pneumatic valve 831 in parallel, and a flow switch B is connected above the flow switch a in parallel.

Preferably, a flow switch C is connected in series above the flow switch B, a check valve is connected in parallel to the left side of the flow switch C, and the check valve is connected in series with the pneumatic valve 833.

Preferably, the high negative pressure fan A and the high negative pressure fan B are in a negative pressure fan type and are arranged at the tail end of the outlet.

Compared with the prior art, the utility model discloses possess following beneficial effect:

1. the LGIP low-speed diesel engine ventilation monitoring system is safe when a cabin is in, in order to effectively guarantee the safety of crews, a double-wall pipe design is adopted, an inner pipe is high-risk LPG (liquefied petroleum gas) liquid fuel, ventilation monitoring air circulates in an annular area of the double-wall pipe to play a role in isolating the dangerous fuel, once the high-risk LPG (liquefied petroleum gas) liquid fuel leaks, the high-risk LPG liquid fuel can be carried to an HC sensor along with flowing air to be detected, a host control system and a security system are immediately stopped and cut off LPG supply, residual LPG in a pipeline is purged by using nitrogen, and the ventilation monitoring system responds quickly.

2. This LGIP low-speed diesel engine ventilation monitoring system, when high negative pressure fan for one use one stand by one, two HC sensors, three flow switch provide the basis for the accurate judgement of system, this monitoring system adopts the redundancy design, can not lead to the unable normal condition of work of ventilation monitoring system because of some equipment or circuit damage, this ventilation monitoring system adopts pneumatic valve spare, all valve state conversion are accomplished through control system operation, simplify personnel's operation, also can prevent the abnormal state that personnel's maloperation arouses.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the figure: 1. a high negative pressure fan A; 2. a high negative pressure fan B; 3. an HC sensor A; 4. an HC sensor B; 5. a pneumatic valve 832; 6. a pneumatic valve 838; 7. a check valve 839; 8. a pressure sensor; 9. a pneumatic valve 831; 10. a flow switch A; 11. a flow switch B; 12. a check valve; 13. a pneumatic valve 833; 14. a flow switch C; 15. a restriction orifice plate; 16. the needle valve is adjusted.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-1, an LGIP low speed diesel engine ventilation monitoring system comprises a high negative pressure fan A1, a high negative pressure fan B2, an HC sensor A3, an HC sensor B4, an air-operated valve 8325, an air-operated valve 8386, a check valve 8397, a pressure sensor 8, an air-operated valve 8319, a flow switch A10, a flow switch B11, a check valve 12, an air-operated valve 83313, a flow switch C14, a throttle orifice plate 15 and an adjusting needle valve 16, wherein the high negative pressure fan A1 is connected in series with the high negative pressure fan B2, the high negative pressure fan A1 is connected in parallel with the throttle orifice plate 15, the right side of the throttle orifice plate 15 is connected in series with the adjusting needle valve 16, the HC sensor A3 is connected in parallel with the lower part of the high negative pressure fan A1, the HC sensor B4 is arranged below the HC sensor A3, the air-operated valve 8325 is arranged below the HC sensor B4, the high negative pressure fan A1, the HC sensor B3615, the HC sensor A3, the HC sensor B4 and the air-operated valve 8325 are connected in parallel with the same line, the lower part of the air-operated valve 8325 is connected with an air-operated valve 8386 in series, the left side of the air-operated valve 8386 is provided with a check valve 8397, the air-operated valve 8386 is connected with the check valve 8397 in parallel, the air-operated valve 8386 and the air-operated valve 8325 are connected with a pressure sensor 8 in series, and the pressure sensor 8 is positioned below the air-operated valve 8386.

The air-operated valve 8325 is connected in parallel with the air-operated valve 8319 via the control air B, a flow switch a10 is connected in parallel above the air-operated valve 8319, and a flow switch B11 is connected in parallel above the flow switch a 10.

A flow switch C14 is connected in series above the flow switch B11, a check valve 12 is connected in parallel to the left side of the flow switch C14, and an air-operated valve 83313 is connected in series to the check valve 12.

Wherein, the high negative pressure fan A1 and the high negative pressure fan B2 adopt a negative pressure fan type and are arranged at the tail end of the outlet.

The working principle is as follows: when the LGIP low-speed diesel engine is arranged in a ship cabin, an LPG inlet and an LPG outlet pipe provide fuel necessary for combustion for a host machine, the cabin is internally specified as a safe area, a pipeline in the cabin is designed by adopting a double-wall pipe because the LPG belongs to class A dangerous gas and has high danger, an inner pipe is used for conveying the fuel LPG, an outer pipe covers an LPG inner pipe, the inner pipe and the outer pipe form an annular space, flowing air is filled in the annular space, once the LPG is leaked from any place of the LPG inner pipe, the LPG is carried to an HC sensor along with the flowing air and is detected, a host machine control system and a security system are immediately shut down and cut off the supply of the LPG, nitrogen is used for blowing the residual LPG in the pipeline, the diesel engine is in a safe state, the double-wall pipe in the cabin is connected with a vent pipe outside the cabin, the air in the whole pipeline is enabled to flow constantly through a high negative pressure fan, the flowing frequency is 30 times per hour, and the air overflow port II has micro gas flowing out, the ventilation monitoring system is used for preventing impurities from entering the ventilation monitoring system, dry air flows through an air inlet I, flows through a pneumatic valve 833, a check valve 846, a flow switch and a pneumatic valve 811, then flows into and out of a double-wall pipe annular area in a cabin, enters a pneumatic valve 832, passes through an HC sensor and a high negative pressure fan, and finally flows out through a throttle orifice plate, the ventilation monitoring system operates in a reciprocating mode in such a way, in order to ensure that a double-wall outer pipe system in the cabin is intact, the pneumatic valve 831 and the pneumatic valve 832 need to be closed every time a diesel engine starts an LPG (liquefied petroleum gas) mode, test air at 7-9bar passes through the check valve 839, the pneumatic valve 838 is opened, the whole double-wall pipe annular area is filled with test air at 7-9bar, a pressure sensor (monitors the pressure relief condition, so as to judge whether the pipeline of the ventilation monitoring system is normal, and in order to adjust the ventilation frequency of the whole ventilation monitoring system 30 times per hour, the ventilation monitoring system can be adjusted by the throttle orifice plate initially, the needle valve is adjusted, fine adjustment is carried out, the adjusting process is simplified, and the operation and the use are optimized through a double adjusting device.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The LGIP low-speed diesel engine ventilation monitoring system comprises a high negative pressure fan A (1), a high negative pressure fan B (2), an HC sensor A (3), an HC sensor B (4), an air-operated valve 832(5), an air-operated valve 838(6), a check valve 839(7), a pressure sensor (8), an air-operated valve 831(9), a flow switch A (10), a flow switch B (11), a check valve (12), an air-operated valve 833(13), a flow switch C (14), a throttle orifice plate (15) and an adjusting needle valve (16), and is characterized in that: the high negative pressure fan A (1) is connected with a high negative pressure fan B (2) in series, a throttling orifice plate (15) is connected above the high negative pressure fan A (1) in parallel, an adjusting needle valve (16) is connected on the right side of the throttling orifice plate (15) in series, an HC sensor A (3) is connected below the high negative pressure fan A (1) in parallel, an HC sensor B (4) is arranged below the HC sensor A (3), pneumatic valves (832) (5) are arranged below the HC sensor B (4), the high negative pressure fans A (1), (15), the HC sensor A (3), the HC sensor B (4) and the pneumatic valves (832) (5) are connected on the same line in parallel, a pneumatic valve (6) is connected below the pneumatic valves (832) (5) in series, a check valve 839(7) is arranged on the left side of the pneumatic valve 838(6), and the pneumatic valve (838) (6) is connected with the check valve 839 (839) (7) in parallel, the pneumatic valve 838(6) and the pneumatic valve 832(5) are connected in series with a pressure sensor (8), and the pressure sensor (8) is positioned below the pneumatic valve 838 (6).

2. An LGIP low speed diesel engine ventilation monitoring system according to claim 1, wherein: the air-operated valve 832(5) is connected with an air-operated valve 831(9) in parallel through a control air B, a flow switch A (10) is connected above the air-operated valve 831(9) in parallel, and a flow switch B (11) is connected above the flow switch A (10) in parallel.

3. An LGIP low speed diesel engine ventilation monitoring system according to claim 1, wherein: a flow switch C (14) is connected in series above the flow switch B (11), a check valve (12) is connected in parallel on the left side of the flow switch C (14), and an air-operated valve 833(13) is connected in series to the check valve (12).

4. An LGIP low speed diesel engine ventilation monitoring system according to claim 1, wherein: the high negative pressure fan A (1) and the high negative pressure fan B (2) are in a negative pressure fan type and are arranged at the tail end of the outlet.