CN116696618A - An intrinsically safe engine gas supply system, installation method and control method - Google Patents

Abstract

The invention discloses an intrinsically safe engine gas supply system and a control method, which belong to the technical field of internal combustion engines and solve the problem of easy leakage, complicated process and high cost of supplying gas to gas fuel engines in the current "GVU+double-wall gas pipe+gas rail" mode. technical problems, the system includes gas main fuel valve, GVU valve box, set-type double-wall gas pipe, double-wall gas rail, gas control unit, GVU valve box is equipped with gas components, and set-type double-wall gas pipe includes outer gas pipe , Inner gas pipe, the double-walled gas rail includes an outer gas rail and an inner gas rail located inside the outer gas rail, the gas components are connected to the inner gas pipe and the inner gas rail in turn through the first flange, and the GVU valve box is connected in turn through the second flange The outer gas pipe, the outer gas rail, and the gas control unit are electrically connected to the gas components. The invention adopts a prefabricated set-type double-wall gas pipe, a special structure GVU valve box, and a gas rail to meet the safe gas transportation of the gas fuel engine, effectively avoid pipeline leakage, and has low cost.

Description

An intrinsically safe engine gas supply system, installation method and control method

technical field

The invention relates to the technical field of internal combustion engines, more specifically, it relates to an intrinsically safe engine gas supply system, an installation method and a control method.

Background technique

The main power of inland river and offshore ships is diesel engines, and the NOx, SOx and particulate matter emitted by them have become one of the main pollution sources of rivers and surrounding ecological environments. From July 2021, the state will implement emission restrictions in accordance with the second stage (hereinafter referred to as C2) of GB15097-2016 "Limits and Measurement Methods of Exhaust Pollutants from Ship Engines (China's First and Second Stages)" and adopt LNG/ CNG, gas, biogas, industrial exhaust and other new fuels to replace traditional diesel fuels have become the most realistic and effective solution to reduce land/marine engine emissions.

The risk of gas leakage is high, flammable and explosive, and the intrinsically safe design can effectively avoid risks and improve the safety of the gas supply system.

In the prior art, each manufacturer adopts the method of "GVU + double-wall gas pipe + gas rail" to supply gas to the gas fuel engine, but the gas pipeline between the GVU and the engine adopts on-site welding, which is limited to the small space on site, and not only the construction is difficult , The construction cost is high, and it will cause secondary pollution of the gas pipeline. If welding slag and other debris enter the gas rail, it will easily cause the gas valve to be stuck and not closed tightly. In severe cases, it will enter the cylinder and cause cylinder scuffing. The optimization technology adopts prefabricated integrated gas pipeline and double-wall flange connection, but the pipeline has high cost, poor welding process, and pipeline leakage is prone to occur.

Contents of the invention

The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The first object of the present invention is to provide an intrinsically safe engine gas supply system.

The second object of the present invention is to provide an installation method for an intrinsically safe engine gas supply system.

The third object of the present invention is to provide an intrinsically safe engine gas supply control method.

In order to achieve the first objective above, the present invention provides an intrinsically safe engine gas supply system, which includes a GVU valve box, a set-type double-wall gas pipe, a double-wall gas rail, and a gas control unit. The GVU valve box is equipped with a gas Assemblies, the set-type double-wall gas pipe includes an outer air pipe, an inner air pipe located in the outer air pipe, the double-walled gas rail includes an outer air rail, an inner air rail located in the outer air rail, the The gas assembly is sequentially connected to the inner gas pipe and the inner gas rail through the first flange, the GVU valve box is sequentially connected to the outer gas pipe and the outer gas rail through the second flange, and the gas control unit is electrically connected to the gas components.

As a further improvement, the gas assembly includes a pipe fitting, on which a pressure sensor, a gas filter, a pressure reducing valve, and a shut-off valve are sequentially arranged, and a relief valve is provided on the pipe fitting between the gas filter and the pressure reducing valve. Valve, the gas assembly is modular installation, installed in the tank of the GVU valve box as a whole, the gas inlet, outlet and discharge port of the gas assembly are connected by flanges, and one end of the pipe is connected to the GVU valve box through the first flange. The internal gas pipe is connected internally, and the gas control unit is electrically connected to the pressure sensor, cut-off valve, and release valve.

Further, the other end of the pipe passes through the GVU valve box and is connected to a gas main fuel valve, and the gas control unit is electrically connected to the gas main fuel valve.

Further, the pipe fittings are welded to the gas filter, the pressure reducing valve, the shut-off valve and the relief valve.

Further, the relief valve is connected with a relief pipe extending to the outside of the GVU valve box.

Further, the inner air rail extends into the outer air pipe and is connected to the inner air pipe through a first flange.

Further, the first flange of the inner air rail is exposed to a certain distance outside the outer air rail.

Further, both the first flange and the second flange are provided with sealing rings.

Further, the outer gas rail is provided with an outer branch rail correspondingly connected with the gas valve parts of each cylinder, and correspondingly, the inner gas rail is provided with an inner branch rail correspondingly connected with the gas valve parts of each cylinder, and the The inner branch rail is located within the outer branch rail.

In order to achieve the second objective above, the present invention provides an installation method for an intrinsically safe engine gas supply system, including:

Step 1: The inner gas pipe of the set double-wall gas pipe is connected with the inner gas rail of the double-wall gas rail through the first flange;

Step 2: The outer gas pipe of the set-type double-wall gas pipe is sleeved outside the inner gas pipe, and connected with the outer gas rail of the double-wall gas rail through the second flange;

Step 3: Insert the inner gas pipe of the set-type double-wall gas pipe into the GVU valve box, and connect with the pipe fitting through the first flange;

Step 4: Connect the outer gas pipe of the set-type double-wall gas pipe with the air inlet pipe of the GVU valve box through the second flange.

In order to achieve the third objective above, the present invention provides an intrinsically safe engine gas supply control method, including:

When the engine needs to be started, activate the gas supply start of the gas control unit, the gas control unit closes the relief valve, delays the first set time, and opens the gas main fuel valve; at this time, the gas control unit enters the ready state;

Start the timer for the second set time; if the gas control unit does not detect the start ignition signal within the second set time, then close the gas main fuel valve, open the release valve, and enter the initial state; otherwise, delay the third setting After the time has elapsed, open the cut-off valve, and the gas is normally supplied to the engine, and the gas control unit enters the normal gas supply state at this time;

The generation of ignition ignition signal: press the engine start button, the ignition ignition signal will be transmitted to the gas control unit;

When the gas control unit enters the normal gas supply state, start the timer for the fourth set time, and start monitoring the engine running signal; Gas fuel valve 4, after delaying the fifth set time, open the release valve to release the fuel in the inner gas pipe and the inner gas rail, and after delaying the sixth set time, close the cut-off valve to eliminate the inner gas pipe behind the cut-off valve and the residual gas in the inner gas rail; otherwise, the system is always in a normal gas supply state;

The "engine running" signal is continuously true after being triggered, and is false when the engine speed is lower than the running speed;

When the gas control unit is in the normal gas supply state, if it detects the machine side stop signal or the remote control stop signal or there is no engine running signal, the gas control unit closes the gas main fuel valve instantly, and after a delay of the seventh set time, it opens and disperses. valve, and then after delaying the eighth set time, close the cut-off valve;

When the gas control unit is in the normal gas supply state, if an emergency stop or fault emergency stop signal is detected, the gas control unit instantly closes the gas main fuel valve and shut-off valve, and opens the release valve at the same time;

The gas pressure entering the GVU valve box is monitored by the pressure sensor, which is used to judge the gas supply status at the front end of the GVU and assist in troubleshooting.

Beneficial effect

Compared with the prior art, the present invention has the advantages of:

1. The gas pipeline between the GVU and the engine gas rail of the present invention adopts a prefabricated set-type double-wall gas pipe, which is simple in structure, does not require double-wall flanges, and has low cost; it has good processing technology and avoids unnecessary Solder joint leakage improves user experience; prefabricated large and small double-wall pipes avoid secondary pollution such as welding slag and damage to gas valve parts; it is easy to disassemble and repair and replace.

2. The GVU gas assembly of the present invention adopts modular installation and external flange connection, which is convenient for disassembly and maintenance; the gas pipeline and valve parts are welded to avoid gas pipeline leakage, improve the reliability of GVU, and solve the problem of GVU gas leakage. Small and inconvenient to troubleshoot maintenance problems.

3. The inner gas rail and the outer gas rail of the double-wall gas rail are separated, and the two are respectively connected by flanges. Compared with the double-wall flange connection, the structure is simpler, the processability is good, and the cost is low.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of inner trachea in the present invention;

Fig. 3 is the structural schematic diagram of outer trachea in the present invention;

Fig. 4 is the structural representation of double wall gas rail in the present invention;

Fig. 5 is a structural principle block diagram of the present invention.

Among them: 1-GVU valve box, 2-suitable double-wall gas pipe, 3-double-wall gas rail, 4-gas control unit, 5-outer gas pipe, 6-inner gas pipe, 7-outer gas rail, 8-inner Gas rail, 9-first flange, 10-second flange, 11-pipe fittings, 12-pressure sensor, 13-gas filter, 14-pressure reducing valve, 15-shut-off valve, 16-release valve, 17- Gas main fuel valve, 18-release pipe, 19-outer branch rail, 20-inner branch rail, 21-air inlet pipe, 22-air outlet pipe.

Detailed ways

The present invention will be further described below in conjunction with the specific embodiments in the accompanying drawings.

Referring to Figures 1 to 5, an intrinsically safe engine gas supply system includes a GVU valve box 1, a set-type double-walled gas pipe 2, a double-walled gas rail 3, and a gas control unit 4. The GVU valve box 1 is equipped with Gas assembly, the set-type double-wall gas pipe 2 includes an outer air pipe 5 and an inner air pipe 6 located in the outer air pipe 5, both of which are processed independently, the inner air pipe 6 is inserted into the outer air pipe 5, and the double-wall gas rail 3 includes an outer gas rail 7. The inner gas rail 8 located in the outer gas rail 7, the gas assembly is connected to the inner gas pipe 6 and the inner gas rail 8 through the first flange 9 in turn, and the GVU valve box 1 is connected to the outer gas pipe 5 and the outer gas rail through the second flange 10 in turn. The gas rail 7, specifically, the air inlet pipe 21 of the GVU valve box 1 is sequentially connected to the outer gas pipe 5 and the outer gas rail 7 through the second flange 10, and the gas control unit 4 is electrically connected to the gas components.

The gas assembly is modularized and installed in the tank body of the GVU valve box 1 as a whole. The gas inlet, outlet and vent of the gas assembly are connected by flanges. The gas assembly includes a pipe fitting 11, which is provided with a pressure sensor 12, a gas filter 13, a pressure reducing valve 14, and a shut-off valve 15 in sequence, and the pipe fitting 11 between the gas filter 13 and the pressure reducing valve 14 is provided with a release valve 16 , one end of the pipe fitting 11 is connected to the inner gas pipe 6 inside the GVU valve box 1 through the first flange 9, where the first flange 9 is located in the GVU valve box 1, and the gas control unit 4 is electrically connected to the pressure sensor 12 and the shut-off valve 15 , Release valve 16.

The other end of the pipe fitting 11 passes through the GVU valve box 1 and is connected to the gas main fuel valve 17, that is, the other end of the pipe fitting 11 passes through the air outlet pipe 22 of the GVU valve box 1, and the gas control unit 4 is electrically connected to the gas main fuel valve. 17.

The pipe fitting 11 is welded to the pressure sensor 12, the gas filter 13, the pressure reducing valve 14, the shut-off valve 15 and the release valve 16. Avoid gas pipeline leakage, improve GVU reliability, and solve the problem of GVU gas leakage, small space and inconvenient troubleshooting and maintenance.

The relief valve 16 is connected with a relief pipe 18 extending to the outside of the GVU valve box 1, and the relief port of the relief pipe 18 is connected by a flange.

The inner air rail 8 extends into the outer air pipe 5 and connects the inner air pipe 6 through the first flange 9, that is, the first flange 9 here is located in the outer air pipe 5, and the inner air rail 8 protrudes a certain distance from the outer air rail 7, That is, the first flange 9 of the inner air rail 8 is exposed to a certain distance outside the outer air rail 7 .

Both the first flange 9 and the second flange 10 are provided with sealing rings to ensure tightness.

The outer gas rail 7 is provided with an outer branch rail 19 correspondingly connected with the gas valve parts of each cylinder, and correspondingly, the inner gas rail 8 is provided with an inner branch rail 20 correspondingly connected with the gas valve parts of each cylinder, and the inner branch rail 20 is located at In the outer branch rail 19.

The inner air pipe 6 can be prefabricated into different shapes according to the site layout requirements, and has a flexible structure. The inner air pipe 6 adopts a bisected flange, that is, the first flange 9 is a bisected flange, which is small in size and high in pressure. Set installation, and effectively ensure the ventilation in the ring cavity of the double-wall pipe. The outer air pipe 5 is connected by a conventional flange, that is, the second flange 10 is a conventional flange.

An installation method of an intrinsically safe engine gas supply system, the installation process is as follows:

The first step: the inner gas pipe 6 of the set-type double-wall gas pipe is connected with the inner gas rail 8 of the double-wall gas rail through the first flange 9;

The second step: the outer gas pipe 5 of the set-type double-wall gas pipe is set outside the inner gas pipe 6, and is connected with the outer gas rail 7 of the double-wall gas rail through the second flange 10;

Step 3: The inner gas pipe 6 of the set-type double-wall gas pipe is inserted into the GVU valve box 1, and connected with the pipe fitting 11 through the first flange 9;

Step 4: The outer air pipe 5 of the set-type double-wall gas pipe is connected with the air inlet pipe 21 of the GVU valve box (1) through the second flange 10 .

An intrinsically safe engine gas supply control method, comprising:

When it is necessary to start the engine, activate the gas supply start of the gas control unit 4, the gas control unit 4 closes the release valve 16, and after delaying the first set time, opens the gas main fuel valve 17; at this time, the gas control unit 4 enters the ready state state, the first setting time is 1.5 seconds;

Start the timer for the second set time; if the gas control unit 4 does not detect the start ignition signal within the second set time, then close the gas main fuel valve 17, open the release valve 16, and enter the initial state; otherwise, delay the second After the third setting time, open the cut-off valve 15, and the gas is normally supplied to the engine, and now the gas control unit 4 enters the normal gas supply state; the second setting time is 5 minutes, and the third setting time is 2 seconds;

The generation of the start ignition signal is as follows: the engine start button is pressed, and the start ignition signal is transmitted to the gas control unit 4;

After the gas control unit 4 enters the normal gas supply state, start the timer to time the fourth set time, and start to monitor the engine running signal; if the engine running signal is not detected within the fourth set time, it is considered that the engine failed to start and shut down The main gas fuel valve 4, after delaying the fifth set time, opens the release valve 16 to disperse the combustion body in the inner gas pipe 6 and the inner gas rail 8, and after delaying the sixth set time, closes the shut-off valve 15 to eliminate Cut off the residual gas in the inner gas pipe 6 and the inner gas rail 8 behind the valve 15; otherwise, the system is always in a normal gas supply state; the fourth setting time is 1 minute, the fifth setting time is 1.5 seconds, and the sixth setting time is 1 second; the "engine running" signal will continue to be true after being triggered. After the running speed is lower than the running speed, the engine running signal is false;

When the gas control unit 4 is in the normal gas supply state, if a machine-side parking signal or a remote control parking signal is detected or there is no engine running signal (the engine running signal is false), the gas control unit 4 instantly closes the gas main fuel valve 17, delaying After the seventh set time, open the release valve 16, then delay the eighth set time, close the cut-off valve 15; the seventh set time is 1.5 seconds, and the eighth set time is 1 second;

When the gas control unit 4 is in the normal gas supply state, if an emergency stop or fault emergency stop signal is detected, the gas control unit instantly closes the gas main fuel valve 17 and the shut-off valve 15, and simultaneously opens the release valve 16;

The gas pressure entering the GVU valve box 1 is monitored by the pressure sensor 12, which is used to judge the gas supply status at the front end of the GVU and assist in troubleshooting. If the engine fails to start, use the pressure sensor 12 to judge whether the gas supply at the front end is abnormal or the gas system of the engine is abnormal. Easy to judge.

The above are only preferred embodiments of the present invention, and it should be pointed out that for those skilled in the art, some deformations and improvements can be made without departing from the structure of the present invention, and these will not affect the effect and implementation of the present invention. Patent utility.

Claims (6)

1. An intrinsically safe engine gas supply system is characterized in that it comprises a GVU valve box (1), a set-type double-wall gas pipe (2), a double-wall gas rail (3), a gas control unit (4), The GVU valve box (1) is provided with a gas assembly, and the set-type double-wall gas pipe (2) includes an outer air pipe (5) and an inner air pipe (6) located in the outer air pipe (5). Independently processed, the inner gas pipe (6) is inserted into the outer gas pipe (5), and the double-wall gas rail (3) includes an outer gas rail (7), an inner gas rail ( 8), the gas assembly is sequentially connected to the inner air pipe (6) and inner gas rail (8) through the first flange (9), and the GVU valve box (1) is sequentially connected through the second flange (10) The outer gas pipe (5), outer gas rail (7), and the gas control unit (4) are electrically connected to the gas components. 2. An intrinsically safe engine gas supply system according to claim 1, characterized in that the gas assembly is installed in a modular manner, and is integrally installed in the tank body of the GVU valve box (1), and the gas inlet of the gas assembly , the outlet and the discharge port are connected by flanges, and the gas assembly includes a pipe fitting (11), and one end of the pipe fitting (11) is connected to the inner gas pipe ( 6), the other end passes through the GVU valve box (1) and is connected to a gas main fuel valve (17), and the gas control unit (4) is electrically connected to the gas main fuel valve (17). 3. An intrinsically safe engine gas supply system according to claim 1, characterized in that the inner gas rail (8) extends into the outer gas pipe (5) and passes through the first flange (9) Connect the inner trachea (6). 4. An intrinsically safe engine gas supply system according to claim 1, characterized in that the first flange (9) of the inner gas rail (8) is exposed for a certain distance outside the outer gas rail (7). 5. A method for installing an intrinsically safe engine gas supply system, characterized in that it comprises: The first step: the inner gas pipe (6) of the set-type double-wall gas pipe is connected with the inner gas rail (8) of the double-wall gas rail through the first flange (9); Step 2: the outer gas pipe (5) of the set-type double-wall gas pipe is set outside the inner gas pipe (6), and is connected with the outer gas rail (7) of the double-wall gas rail through the second flange (10); Step 3: Insert the inner gas pipe (6) of the set-type double-wall gas pipe into the GVU valve box (1), and connect with the pipe fitting (11) through the first flange (9); Step 4: The outer gas pipe (5) of the set-type double-wall gas pipe is connected with the air inlet pipe (21) of the GVU valve box (1) through the second flange (10). 6. An intrinsically safe engine gas supply control method, characterized in that it comprises: When the engine needs to be started, activate the gas supply start of the gas control unit (4), the gas control unit (4) closes the release valve (16), and after delaying the first set time, opens the gas main fuel valve (17); When the gas control unit (4) enters the ready state; Start the timer for the second set time; if the gas control unit (4) does not detect the start ignition signal within the second set time, then close the gas main fuel valve (17), open the release valve (16), and enter the initial state Otherwise, after delaying the third set time, open the cut-off valve (15), and the gas is normally supplied to the engine, and now the gas control unit (4) enters the normal gas supply state; The generation of the ignition signal: press the engine start button, and the ignition signal is transmitted to the gas control unit (4); When the gas control unit (4) enters the normal gas supply state, start the timer for the fourth set time, and start monitoring the engine running signal; if the engine running signal is not detected within the fourth set time, it is considered that the engine has failed to start , close the main gas fuel valve 4, after the fifth set time delay, open the release valve (16) to release the fuel in the inner gas pipe (6) and the inner gas rail (8), and then delay the sixth set time , close the shut-off valve (15) to remove the residual gas in the inner gas pipe (6) and inner gas rail (8) behind the shut-off valve (15); otherwise, the system is always in a normal gas supply state; The "engine running" signal is continuously true after being triggered, and is false when the engine speed is lower than the running speed; When the gas control unit (4) is in the normal gas supply state, if a machine-side parking signal or a remote control parking signal is detected or there is no engine running signal, the gas control unit (4) instantly closes the gas main fuel valve (17) and delays After the seventh set time, open the release valve (16), then delay the eighth set time, then close the shut-off valve (15); When the gas control unit (4) is in the normal gas supply state, if an emergency stop or fault emergency stop signal is detected, the gas control unit instantly closes the gas main fuel valve (17) and the shut-off valve (15), and simultaneously opens the release valve (16 ).