CN112502864A - Natural gas feeding pressure adjusting device of dual-fuel engine - Google Patents
Natural gas feeding pressure adjusting device of dual-fuel engine Download PDFInfo
- Publication number
- CN112502864A CN112502864A CN202011512009.2A CN202011512009A CN112502864A CN 112502864 A CN112502864 A CN 112502864A CN 202011512009 A CN202011512009 A CN 202011512009A CN 112502864 A CN112502864 A CN 112502864A
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- Prior art keywords
- pressure regulating
- natural gas
- regulating valve
- dual
- pipe
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
- F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
- F02B69/04—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel for gaseous and non-gaseous fuels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
- F02M21/0239—Pressure or flow regulators therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention discloses a pressure regulating device for natural gas entering a dual-fuel engine, which comprises a primary pressure regulating unit, a secondary pressure regulating valve and an explosion-proof seal box, wherein the primary pressure regulating valve of the primary pressure regulating unit is supported on the longitudinal side wall of a lower box body through a right-angle bracket, and two ends of the secondary pressure regulating valve are respectively supported in two ends of the explosion-proof seal box through natural gas steel pipes; the natural gas input double-wall pipe and the natural gas output double-wall pipe are respectively fixedly connected with the corresponding natural gas steel pipes in a sealing way. The invention uses the common single-wall pressure regulating valve to replace an expensive single-wall pressure regulating valve for regulating the pressure of the natural gas, has high regulating speed and greatly reduces the regulating cost of the natural gas inlet pressure of the dual-fuel engine. According to the invention, the secondary pressure regulating valve is regulated by nitrogen in the seal box, so that natural gas and air are completely separated, and the safety of the dual-fuel engine is greatly improved.
Description
Technical Field
The invention relates to a natural gas supply device of a dual-fuel engine, in particular to a device for adjusting the pressure of natural gas supplied to the dual-fuel engine, belonging to the technical field of dual-fuel engines.
Background
Along with the rapid increase of energy demand, the utilization of natural gas resources is also increasingly wide, the environmental protection attention degree of all countries in the world is increasingly improved, higher requirements on energy conservation and emission reduction are provided, and a 'gas-oil-replacing' dual-fuel engine project is listed as a national major technical equipment development project. The dual-fuel engine can work in a diesel and natural gas dual-fuel state and can work normally in a pure diesel state, and convenient conversion between diesel and dual fuel can be realized. However, in the gas mode, the dynamic characteristics of the diesel engine are very poor, and the root cause is that the adjustment of the natural gas intake amount is delayed.
At present, natural gas of most dual-fuel engines is mixed with air in an air inlet pipe, the air inflow of the natural gas is determined by the opening time of an injection electromagnetic valve and injection pressure, but the air inlet pressure (namely the pressure in the air inlet pipe) changes along with the change of load, and the pressure in the pipe is increased when the load is increased. If the natural gas feeding pressure is not changed, the injection pressure (the pressure difference between the natural gas feeding pressure and the pressure in the air inlet pipe) is reduced, the injection amount is reduced in the same time, and the normal operation of the dual-fuel engine is influenced, so that the diesel engine feeding pressure needs to be quickly increased when the load of the diesel engine is increased. However, due to the requirements of explosion prevention and leakage prevention, the conventional electronic control pressure regulating valve cannot be directly selected for the pressure regulating valve of the natural gas, so that on one hand, the regulation is slow, and on the other hand, the natural gas explosion can be caused by any electromagnetic control pressure regulating valve. In addition, the existing pressure regulating valves are basically of single-wall structures, and have great risk of leakage. If the pressure regulating valve with the double-wall structure is adopted, the purchase cost of the pressure regulating valve is 5-10 times that of the pressure regulating valve with the single-wall structure, and obviously, the pressure regulating valve cannot bear the cost.
Disclosure of Invention
The invention aims to provide a pressure regulating device for natural gas entering a dual-fuel engine, which integrates a pressure regulating device meeting the corresponding explosion-proof and leakage-proof standard requirements and being faster to regulate on the basis of the traditional single-wall structure pressure regulating valve.
The invention is realized by the following technical scheme:
a pressure adjusting device for natural gas entering a dual-fuel engine comprises a primary pressure adjusting unit, a secondary pressure adjusting valve and an explosion-proof sealing box, wherein the explosion-proof sealing box comprises an upper box cover and a lower box body, a sealing gasket is padded between the upper box cover and the lower box body, and the upper box cover and the lower box body are fixedly connected into a whole through a plurality of bolt and nut assemblies; the primary pressure regulating unit comprises a primary pressure regulating valve and a right-angle bracket, the lower end of the primary pressure regulating valve is supported on the longitudinal side wall of the lower box body through the right-angle bracket, and the two ends of the secondary pressure regulating valve are respectively supported in the two ends of the explosion-proof sealing box through natural gas steel pipes; one end of the natural gas input double-wall pipe is fixedly connected with an input cover plate which is hermetically fixed on the transverse side wall of one end of the lower box body, and one end of the natural gas output double-wall pipe is fixedly connected with an output cover plate which is hermetically fixed on the transverse side wall of the other end of the lower box body; and one end of each natural gas steel pipe is fixedly connected with a corresponding inner flange, and the inner flanges are fixedly connected with corresponding input cover plates or output cover plates respectively.
The object of the invention is further achieved by the following technical measures.
Furthermore, the upper part of one side of the primary pressure regulating valve is fixedly connected with one end of a nitrogen input pipe through a pipe joint, the upper part of the other side of the primary pressure regulating valve is fixedly connected with one end of a nitrogen output pipe through a pipe joint, and the other end of the nitrogen output pipe penetrates through the longitudinal side wall of the lower box body and then is fixed on one side of the secondary pressure regulating valve through a pipe joint.
Furthermore, the end heads of the other ends of the natural gas steel pipes are respectively and fixedly connected with connecting flanges fixed on the upper parts of the two sides of the secondary pressure regulating valve.
Further, the secondary pressure regulating valve is a pilot pressure regulating valve, the pilot pressure regulating valve comprises two input ends and an output end, the two input ends respectively receive the nitrogen output by the primary pressure regulating valve and the natural gas output by the natural gas output double-wall pipe, and the output end is a natural gas output end after secondary pressure regulation. The range of the pressure of the nitrogen output by the primary pressure regulating valve is 0-6 Mpa.
Furthermore, the lower part of the lower box body is also provided with a leakage detecting pipe.
The invention adopts the primary pressure regulating unit outside the explosion-proof sealing box to convey nitrogen into the secondary pressure regulating valve of the single-wall structure in the explosion-proof sealing box to regulate the natural gas pressure output to the dual-fuel engine through the secondary pressure regulating valve, and has compact structure and convenient and quick regulation. The common single-wall pressure regulating valve is used for replacing an expensive single-wall pressure regulating valve to regulate the pressure of the natural gas, the regulation speed is high, and the regulation cost of the natural gas feeding pressure of the dual-fuel engine is greatly reduced. According to the invention, the secondary pressure regulating valve is regulated by nitrogen in the explosion-proof seal box, so that natural gas and air are completely separated, and the safety of the dual-fuel engine is greatly improved.
Advantages and features of the present invention will be illustrated and explained by the following non-restrictive description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a top view of FIG. 1;
fig. 3 is a left side view of fig. 1.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1 to 3, the present invention includes a primary pressure regulating unit 1, a secondary pressure regulating valve 2 and an explosion-proof sealed box 3, wherein the explosion-proof sealed box 3 includes an upper box cover 31 and a lower box body 32, a gasket 311 is disposed between a circle of flanges of the upper box cover 31 and the lower box body 32, and the upper box cover 31 and the lower box body 32 are fixedly connected into a whole through a plurality of bolt-nut assemblies 312.
The primary pressure regulating unit 1 includes a primary pressure regulating valve 11 and a right-angle bracket 12, the lower end of the primary pressure regulating valve 11 is supported on the longitudinal side wall 321 of the lower case 32 through the right-angle bracket 12, and the two ends of the secondary pressure regulating valve 2 are supported in the two ends of the explosion-proof seal box 3 through the natural gas steel pipes 21, respectively. The range of the pressure of the nitrogen output by the primary pressure regulating valve 11 is 0-6 Mpa.
In fig. 1, the left end of the natural gas input double-wall pipe 4 at the right end is fixedly connected with an input cover plate 33 which is hermetically fixed on the transverse side wall 322 at the right end of the lower box 32, and the right end of the natural gas output double-wall pipe 5 is fixedly connected with an output cover plate 34 which is hermetically fixed on the transverse side wall 323 at the left end of the lower box 32. The end heads of one end of the natural gas steel pipe 21 are respectively and fixedly connected with corresponding inner flanges 35, and the inner flanges 35 are respectively and fixedly connected with corresponding input cover plates 33 or output cover plates 34. The other end of the natural gas steel pipe 21 is fixedly connected with the connecting flanges 22 fixed on the upper parts of the two sides of the secondary pressure regulating valve 2, so that the secondary pressure regulating valve 2 is supported in the lower box body 32 through the natural gas steel pipes 21 on the two sides. The lower part of the lower box body 32 is also provided with a leakage detecting pipe 324 which can be connected with a leakage detector to detect whether natural gas leaks in the explosion-proof sealing box 3, thereby ensuring the safety of the invention.
As shown in FIG. 2, the upper portion of the right side of the primary pressure regulating valve 11 is fixedly connected to the right end of the nitrogen inlet pipe 13 through a pipe joint 111, the upper portion of the left side of the primary pressure regulating valve is fixedly connected to one end of the nitrogen outlet pipe 14 through the pipe joint 111, and the other end of the nitrogen outlet pipe 14 passes through the longitudinal side wall 321 of the lower case 32 and is fixed to the right side of the secondary pressure regulating valve 2 through the pipe joint 111.
The secondary pressure regulating valve 2 is a pilot pressure regulating valve and comprises two input ends and an output end, wherein the first input end 22 receives nitrogen output by the primary pressure regulating valve 1, the second input end 23 receives natural gas output by the natural gas output double-wall pipe 4, and the output end 24 is a natural gas output end after secondary pressure regulation.
According to the invention, the primary pressure regulating valve 11 conveys the nitrogen regulated to 6Mpa to the secondary pressure regulating valve 2 through the nitrogen output pipe 14, and replaces an electromagnet to change the valve core position of the secondary pressure regulating valve 2, so that the natural gas inlet pressure conveyed to a dual-fuel engine through the natural gas output double-wall pipe 5 meets the working condition requirement of the dual-fuel engine, and the safety of natural gas pressure regulation is ensured. When the load of the dual-fuel engine is increased to 50%, the natural gas inlet pressure needs to be adjusted to 0.32Mpa, so that the natural gas inlet amount is increased. At this time, the primary pressure regulating valve 1 regulates the input nitrogen to 0.32Mpa, and the nitrogen is input into the secondary pressure regulating valve 2 in the explosion-proof sealed box 3 through the nitrogen output pipe 14. The secondary pressure regulating valve 2 regulates the output pressure of the natural gas to 0.32Mpa which is the same as that of the nitrogen gas under the action of a pilot valve and an internal diaphragm. Thereby guaranteeing the natural gas input.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.
Claims (6)
1. A pressure adjusting device for natural gas entering a dual-fuel engine is characterized by comprising a primary pressure adjusting unit, a secondary pressure adjusting valve and an explosion-proof sealing box, wherein the explosion-proof sealing box comprises an upper box cover and a lower box body, a sealing gasket is arranged between the upper box cover and the lower box body in a cushioning mode, and the upper box cover and the lower box body are fixedly connected into a whole through a plurality of bolt and nut assemblies; the primary pressure regulating unit comprises a primary pressure regulating valve and a right-angle bracket, the lower end of the primary pressure regulating valve is supported on the longitudinal side wall of the lower box body through the right-angle bracket, and the two ends of the secondary pressure regulating valve are respectively supported in the two ends of the explosion-proof sealing box through natural gas steel pipes; one end of the natural gas input double-wall pipe is fixedly connected with an input cover plate which is fixed on the transverse side wall of one end of the lower box body in a sealing mode, one end of the natural gas output double-wall pipe is fixedly connected with an output cover plate which is fixed on the transverse side wall of the other end of the lower box body in a sealing mode, one end heads of natural gas steel pipes supporting two ends of the secondary pressure regulating valve are fixedly connected with corresponding inner flanges respectively, and the inner flanges are fixedly connected with the corresponding input cover plate or output cover plate respectively.
2. The natural gas feed pressure regulating device for the dual-fuel engine as claimed in claim 1, wherein the upper part of one side of the primary pressure regulating valve is fixedly connected with one end of the nitrogen gas input pipe through a pipe joint, the upper part of the other side of the primary pressure regulating valve is fixedly connected with one end of the nitrogen gas output pipe through a pipe joint, and the other end of the nitrogen gas output pipe penetrates through the longitudinal side wall of the lower tank body and is fixed on one side of the secondary pressure regulating valve through a pipe joint.
3. The natural gas feed pressure regulating device for the dual-fuel engine as claimed in claim 1, wherein the ends of the other end of the natural gas steel pipe are fixedly connected with connecting flanges fixed on the upper parts of the two sides of the secondary pressure regulating valve respectively.
4. The natural gas feed pressure regulating device for the dual-fuel engine as claimed in claim 1, wherein the secondary pressure regulating valve is a pilot pressure regulating valve, the pilot pressure regulating valve comprises two input ends and an output end, the two input ends respectively receive the nitrogen gas output by the primary pressure regulating valve and the natural gas output by the natural gas output double-wall pipe, and the output end is a natural gas output end after secondary pressure regulation.
5. The natural gas feeding pressure regulating device for the dual-fuel engine as claimed in claim 1, wherein the range of the pressure of the nitrogen gas output by the primary pressure regulating valve is 0-6 Mpa.
6. The natural gas feed pressure regulating device for the dual-fuel engine as claimed in claim 1, wherein a leak detection pipe is further provided at the lower part of the lower tank body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011512009.2A CN112502864A (en) | 2020-12-19 | 2020-12-19 | Natural gas feeding pressure adjusting device of dual-fuel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011512009.2A CN112502864A (en) | 2020-12-19 | 2020-12-19 | Natural gas feeding pressure adjusting device of dual-fuel engine |
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| Publication Number | Publication Date |
|---|---|
| CN112502864A true CN112502864A (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011512009.2A Pending CN112502864A (en) | 2020-12-19 | 2020-12-19 | Natural gas feeding pressure adjusting device of dual-fuel engine |
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| CN (1) | CN112502864A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109593A (en) * | 2021-12-16 | 2022-03-01 | 中船动力镇江有限公司 | Inert gas purging device for dual-fuel engine |
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| CN1275676A (en) * | 2000-07-11 | 2000-12-06 | 上海交通大学 | Low-pressure electric controlled dimethyl ether fuel injection system |
| CN204552985U (en) * | 2015-04-16 | 2015-08-12 | 襄阳市普创机电设备有限公司 | Natural gas engine low-pressure relief valve |
| CN106948972A (en) * | 2017-03-14 | 2017-07-14 | 中国船舶重工集团公司第七研究所 | Gaseous propellant engine combustion gas valve member unit and its assembly |
| CN206397621U (en) * | 2017-01-24 | 2017-08-11 | 哈尔滨哈船动力技术有限责任公司 | A kind of gas fuel Power Vessel air supply system essential safe type valve member case |
| CN107228280A (en) * | 2017-08-07 | 2017-10-03 | 苏州新锐低温设备有限公司 | A kind of coal changes gas gasification pry regulator |
| KR101884766B1 (en) * | 2017-07-28 | 2018-08-02 | 대우조선해양 주식회사 | Fuel gas supplying system in ships |
| CN110242425A (en) * | 2019-07-26 | 2019-09-17 | 中船动力有限公司 | Dual fuel engine security system and control method |
-
2020
- 2020-12-19 CN CN202011512009.2A patent/CN112502864A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275676A (en) * | 2000-07-11 | 2000-12-06 | 上海交通大学 | Low-pressure electric controlled dimethyl ether fuel injection system |
| CN204552985U (en) * | 2015-04-16 | 2015-08-12 | 襄阳市普创机电设备有限公司 | Natural gas engine low-pressure relief valve |
| CN206397621U (en) * | 2017-01-24 | 2017-08-11 | 哈尔滨哈船动力技术有限责任公司 | A kind of gas fuel Power Vessel air supply system essential safe type valve member case |
| CN106948972A (en) * | 2017-03-14 | 2017-07-14 | 中国船舶重工集团公司第七研究所 | Gaseous propellant engine combustion gas valve member unit and its assembly |
| KR101884766B1 (en) * | 2017-07-28 | 2018-08-02 | 대우조선해양 주식회사 | Fuel gas supplying system in ships |
| CN107228280A (en) * | 2017-08-07 | 2017-10-03 | 苏州新锐低温设备有限公司 | A kind of coal changes gas gasification pry regulator |
| CN110242425A (en) * | 2019-07-26 | 2019-09-17 | 中船动力有限公司 | Dual fuel engine security system and control method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109593A (en) * | 2021-12-16 | 2022-03-01 | 中船动力镇江有限公司 | Inert gas purging device for dual-fuel engine |
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Application publication date: 20210316 |