Ammonia fuel low-speed engine test bed security system

Abstract

The utility model discloses an ammonia fuel low-speed engine test bed security system which comprises a plurality of two-way electromagnetic valves, a plurality of one-way valves, a plurality of pressure sensors, an air supply fan, an air draft fan, a manual two-way valve, a buffer tank, an ammonia detector, a three-way electromagnetic valve, a flow meter and an outdoor ammonia steam tank. And a signal line of the PLC is respectively connected with the control ends of the two-way electromagnetic valves, the pressure sensors, the air supply fan, the air draft fan and the flow meter. Under different working conditions of slight leakage or serious leakage of ammonia fuel, the leaked ammonia fuel is recovered into the outdoor ammonia evaporation tank, so that the safety of field personnel is ensured, and a reliable guarantee is provided for safe and reliable test run of the ammonia fuel low-speed engine.

Description

TECHNICAL FIELD

[0001] The utility model relates to a new energy engine test bed, especially an ammonia fuel low-speed (n <= 300rpm) engine test bench test security system belongs to new energy engine technical field. BACKGROUND

[0002] At present, all global marine low-speed engine manufacturers are actively promoting the development of ammonia fuel low-speed engine, but ammonia is gaseous at normal temperature and pressure, and high concentration of ammonia is toxic to human body, and ammonia has certain corrosiveness to carbon steel. Therefore, when carrying out ammonia fuel low-speed engine test bench test, effective ammonia leakage protection measures must be taken to avoid ammonia leakage causing harm to on-site test personnel, so as to ensure safe and reliable debugging and testing of ammonia fuel low-speed engine and promote zero-carbon development of marine engine. INVENTION CONTENTS

[0003] The utility model aims at providing a marine ammonia fuel low-speed engine test bench security system to meet the safety requirements of ammonia fuel low-speed engine test, and effectively and reliably handle ammonia leakage to ensure the safety of on-site test personnel.

[0004] The utility model is implemented by the following technical solutions:

[0005] The application relates to an ammonia fuel low-speed engine test bed security system, which comprises a plurality of two-way electromagnetic valves, a plurality of one-way valves, a plurality of pressure sensors, a blowing fan, an exhaust fan, a manual two-way valve, a buffer tank, an ammonia detector, a three-way electromagnetic valve and a flowmeter located in a room where the ammonia fuel low-speed engine is located, and an ammonia vapor tank located outdoors; a low-pressure nitrogen pipe is connected with a first two-way electromagnetic valve, a high-pressure nitrogen pipe is connected with a second two-way electromagnetic valve, and then the two pipes are combined into a connecting pipe; the connecting pipe is connected with a fifth two-way electromagnetic valve and a fifth one-way valve in sequence, and then the connecting pipe is divided into two pipes; one pipe is connected with a D3 port of a nitrogen fuel leakage pipe at the bottom of the ammonia fuel engine, and the other pipe is connected with one end of the ammonia vapor tank through a wall; the connecting pipe at the joint of the low-pressure nitrogen pipe and the high-pressure nitrogen pipe is divided into two branches; one branch is connected with an outer pipe of a D2 output double-wall pipe of the ammonia fuel low-speed engine through a third two-way electromagnetic valve and a first one-way valve in sequence; the connecting pipe of the outer pipe of the D2 output double-wall pipe is connected with an ammonia vapor tank through a wall through an eighth two-way electromagnetic valve, an ammonia detector, an exhaust fan, a bypass end of a three-way electromagnetic valve, a straight-through E2 end of the three-way electromagnetic valve and then the other end of the ammonia vapor tank; the other branch is connected with an outer pipe of a D1 input double-wall pipe of the ammonia fuel low-speed engine through a fourth two-way electromagnetic valve and a second one-way valve in sequence, and then the branch is divided into two branches; one branch is connected with a B2 atmospheric input pipe port of the ammonia fuel low-speed engine; the other branch is connected with a B1 port of a 0.7-1.0Mpa pressure dry compressed air input pipe through a buffer tank, a fourth one-way valve, a flowmeter, a third one-way valve, a sixth two-way electromagnetic valve and a blowing fan in sequence; signal lines of a PLC controller are connected with control ends of the two-way electromagnetic valves, the pressure sensors, the blowing fan, the exhaust fan and the flowmeter.

[0006] The purpose of the utility model can also be realized in one step through the following technical measures.

[0007] Further, the first pressure sensor is connected to the connecting pipe at the joint of the first two-way electromagnetic valve and the second two-way electromagnetic valve; the second pressure sensor is connected to the connecting pipe of the outer pipe of the D2 output double-wall pipe of the ammonia fuel low-speed engine and the first one-way valve; and the third pressure sensor is connected to the connecting pipe of the flowmeter and the buffer tank.

[0008] Further, the pressure of the low-pressure nitrogen pipe is 0.3Mpa, and the pressure of the high-pressure nitrogen pipe is 3.0Mpa.

[0009] Further, the pressure detection range of the first pressure sensor, the second pressure sensor and the third pressure sensor is 0-15Mpa, and the output current signal is 4-20mA.

[0010] Further, the measurement range of the ammonia detector is 0-1000ppm, the measurement accuracy is less than or equal to 1ppm, and the output current signal is 4-20mA.

[0011] Further, the air volume of the air supply fan is 60m 3 / h, and the air volume of the air exhaust fan is 40m 3 / h.

[0012] Further, the capacity of the buffer tank is 0.8-1.2m 3 .

[0013] The utility model discloses a plurality of two-way electromagnetic valve, a plurality of check valve, three -way electromagnetic valve, air supply fan, air exhaust fan and ammonia detector are connected through the connecting pipeline combination connection's structure, through the different combination of electromagnetic valve opening and closing, and through the different input pattern of high pressure nitrogen gas, low pressure nitrogen gas, compressed air and ambient air, provide a safe and reliable ammonia fuel low -speed engine test stand test security system, realize the sealing performance test before ammonia fuel engine start, ammonia fuel engine normal start no leakage, ammonia fuel slight leakage and ammonia fuel serious leakage under the different working conditions of leakage ammonia fuel recovery into the outdoor ammonia evaporation tank.Effectively reduce the risk of ammonia leakage to human body when ammonia fuel low -speed engine test stand test, ensure the safety of the on -the -spot personnel, provide reliable guarantee for the safe and reliable test of ammonia fuel low -speed engine.

[0014] The advantages and characteristics of the utility model will be illustrated and explained through the following non-restrictive description of preferred embodiments, and these embodiments are given only as examples with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the principle view of ammonia fuel low -speed engine test stand security system. DETAILED DESCRIPTION

[0016] The utility model will be further described below in combination with the drawings and embodiments.

[0017] As Figure 1As shown, the safety system for the ammonia fuel low-speed engine test bench of this utility model includes eight two-way solenoid valves, five one-way valves, three pressure sensors, a blower 41, an exhaust fan 42, a manual two-way valve 5, a buffer tank 6, an ammonia detector 7, a three-way solenoid valve 8, and a flow meter 9 located in the room where the ammonia fuel low-speed engine 100 is located, as well as an ammonia vapor tank 20 located outdoors. The low-pressure nitrogen pipe 101 passes through the first two-way solenoid valve 11, and the high-pressure nitrogen pipe 102 passes through the second two-way solenoid valve 12 and then merges into a connecting pipe 103. The connecting pipe 103 is connected to the fifth two-way solenoid valve 15 and the fifth one-way valve 25 in sequence and then splits into two paths. One connecting pipe 103 is connected to the D3 port of the nitrogen fuel leakage pipe 104 at the bottom of the ammonia fuel engine 100, and the other connecting pipe 103 passes through the wall 200 and is connected to one end of the ammonia vapor tank 10. The connecting pipe 103 at the junction of the low-pressure nitrogen pipe 101 and the high-pressure nitrogen pipe 102 splits into two branches. One branch passes through the third two-way solenoid valve 13 and the first one-way valve 21 in sequence, and then connects to the outer pipe of the D2 output double-wall pipe 105 of the ammonia fuel low-speed engine 100. The connecting pipe 103 of the outer pipe of the D2 output double-wall pipe 105 also passes through the eighth two-way solenoid valve 18, the ammonia detector 7, the exhaust fan 42, the bypass end 81 of the three-way solenoid valve, and the direct E2 end 82 of the three-way solenoid valve in sequence, and then passes through the wall 200 to connect to the other end of the ammonia vapor tank 20. Another branch line passes through the fourth two-way solenoid valve 14 and the second one-way valve 22 in sequence, and then splits into two branches. One branch line's connecting pipe 103 is connected to the outer pipe of the D1 input double-wall pipe 106 of the ammonia fuel low-speed engine 100. The other branch line passes through the sixth two-way solenoid valve 16, the third one-way valve 23, the flow meter 9, the buffer tank 6, the fourth one-way valve 24, and the air supply fan 41 in sequence, and is connected to the B2 atmospheric input pipe 108 at normal temperature and pressure. One end of the buffer tank 6 is connected to the B1 port of the dry compressed air input pipe 108 at a pressure of 0.7-1.0 MPa in sequence through the manual two-way valve 5 and the seventh solenoid valve 17. The signal line 301 of the PLC controller 30 is connected to the control terminals of each two-way solenoid valve, each pressure sensor, the air supply fan 41, the exhaust fan 42, and the flow meter 9, respectively.

[0018] The first pressure sensor 31 is connected in bypass of the connecting pipe 103 where the first two-way solenoid valve 11 and the second two-way solenoid valve 12 meet. The second pressure sensor 32 is connected in bypass of the connecting pipe 103 where the first one-way valve 21 connects to the outer pipe of the D2 output double-walled pipe 106 of the ammonia fuel low-speed engine. The third pressure sensor 33 is connected in bypass of the connecting pipe 103 between the flow meter 9 and the buffer tank 6. The pressure of the low-pressure nitrogen pipe 101 is 0.3 MPa, and the pressure of the high-pressure nitrogen pipe 102 is 3.0 MPa.

[0019] The pressure detection range of the first pressure sensor 31, the second pressure sensor 32, and the third pressure sensor 33 is 0 to 15 MPa, and the output current signal is 4 to 20 mA.

[0020] The ammonia detector 7 has a measurement range of 0–1000 ppm and a measurement accuracy of ≤1 ppm; its output current signal is 4–20 mA. The air volume of the blower 41 is 60 m³ / h. 3 / h, the air volume of exhaust fan 42 is 40m³ / h. 3 / h. Controlled by the PLC controller 30, the supply fan 41 and exhaust fan 42 ensure an air exchange rate of 30-40 times per hour, with each exchange equal to the total capacity of all double-walled outer pipes. The buffer tank 6 has a capacity of 0.8-1.2 m³. 3 It is mainly used to ensure the relative stability of the supply gas pressure. The main function of the ammonia vapor tank 20 is to separate and recover ammonia from the mixed gas, preventing it from being directly discharged into the atmosphere.

[0021] The operation of the safety system for the ammonia-fueled low-speed engine test bench includes the following corresponding processes under different operating conditions:

[0022] a) Sealing performance test process of ammonia fuel engine before 100 start-up

[0023] a1) The PLC controller 30 sends a signal to open the second two-way solenoid valve 12 and close the third two-way solenoid valve 13, the fourth two-way solenoid valve 14, the sixth two-way solenoid valve 16 and the eighth two-way solenoid valve 18. The 3.0 MPa high-pressure nitrogen gas input from the A2 port of the high-pressure nitrogen pipe 102 passes through the second two-way solenoid valve 12 and is then sealed in the connecting pipe 103.

[0024] a2) When the first pressure sensor 31 detects a pressure of 3.0 MPa, the PLC controller 30 sends a signal to close the second two-way solenoid valve 12 and maintain the system pressure for 10 minutes. If the nitrogen pressure decreases by no more than 10 kPa within 10 minutes, the system meets the sealing requirements.

[0025] b) Normal start-up and leak-free operation of the ammonia fuel engine

[0026] b1) In a dry environment with an air temperature exceeding 20°C and an air humidity of less than 30%, when the ammonia fuel engine 100 is operating normally, ordinary air is used to ventilate the inner wall of the double-walled pipe. The PLC controller 30 sends a signal to start the blower 41, and opens the sixth two-way solenoid valve 16, the eighth two-way solenoid valve 18, the exhaust fan 42, and connects the bypass terminal 83 of the three-way solenoid valve and the direct E1 terminal 81 of the three-way solenoid valve. Atmospheric air at normal temperature and pressure enters through the B2 atmospheric inlet port of the input pipe 108, passes sequentially through the blower 41, the fourth one-way valve 24, the buffer tank 6, the flow meter 9, the third one-way valve 23, and the sixth two-way solenoid valve 16, and enters the outer pipe of the D1 input double-wall pipe 105 of the ammonia fuel low-speed engine 100. Then it is output from the outer pipe of the D2 output double-wall pipe 106 of the ammonia fuel low-speed engine 100, passes sequentially through the eighth two-way solenoid valve 18, the ammonia detector 7, the exhaust fan 42, the bypass end 83 of the three-way solenoid valve, and the direct E1 end 81 of the three-way solenoid valve, and is discharged from the C port of the exhaust pipe 109 that passes through the wall 200.

[0027] b2) In an environment where the air temperature does not exceed 20°C and the air humidity is less than 30%, open the manual two-way valve 5. Simultaneously, the PLC controller 30 sends a signal to open the sixth two-way solenoid valve 16, the seventh two-way solenoid valve 17, and the eighth two-way solenoid valve 18, respectively. This connects the bypass terminal 83 of the three-way solenoid valve and the direct E1 terminal 81 of the three-way solenoid valve, allowing 0.7 MPa dry compressed air to be input from the B1 input port of the intake pipe 107. The compressed air then passes through the seventh two-way solenoid valve 17 and the manual two-way valve 5 in sequence. 5. The buffer tank 6, flow meter 9, third check valve 23 and sixth two-way solenoid valve 16 enter from the outer pipe of the D1 input double-wall pipe 105 of the ammonia fuel low-speed engine 100, and then exit from the outer pipe of the D2 output double-wall pipe 106 of the ammonia fuel low-speed engine 100. They pass through the eighth solenoid valve 18, ammonia detector 7 and exhaust fan 42 in sequence, and then through the bypass end 83 of the three-way solenoid valve and the direct E1 end 81 of the three-way solenoid valve, and are discharged from the C port of the exhaust pipe 109 leading to the outside.

[0028] c) Start-up and operation procedures for ammonia-fueled low-speed engines with a slight leak of no more than 200 ppm

[0029] When the ammonia detector 7 detects a slight leak of ammonia fuel of no more than 200 ppm, the PLC controller 30 sends a signal to open the first two-way solenoid valve 11 and the fourth two-way solenoid valve 14 respectively, and close the third two-way solenoid valve 13. At this time, nitrogen gas with a pressure of 0.3.0 MPa enters from the A1 port of the low-pressure nitrogen pipe 101, passes through the first two-way solenoid valve 11, the fourth two-way solenoid valve 14 and the second one-way valve 22 in sequence, enters from the outer pipe of the ammonia fuel D1 input double-wall pipe 105, and then exits from the outer pipe of the ammonia fuel D2 output double-wall pipe 106. It then passes through the eighth solenoid valve 18, the ammonia detector 7 and the exhaust fan 42 in sequence, and then exits from the bypass end 83 of the three-way solenoid valve and the direct end E2 end 82 of the three-way solenoid valve. Finally, it enters the outdoor ammonia vapor tank 20 through the connecting pipe 103 to collect the leaked ammonia fuel. At the same time, the PLC controller 30 sends a signal to open the fifth two-way solenoid valve 15 every 10 minutes and continue for 20 seconds. Nitrogen gas with a pressure of 0.3.0 MPa input from the A1 port of the low-pressure nitrogen pipe 101 passes through the fifth one-way valve 25 and merges with the ammonia fuel leaking from the nitrogen fuel D3 leak port 104 at the bottom of the ammonia fuel low-speed engine, and blows it back to the ammonia vapor tank 20 for collecting ammonia fuel.

[0030] d) Start-up and operation of ammonia-fueled low-speed engine 100 under severe leakage exceeding 200 ppm

[0031] When the ammonia detector 7 detects a severe leak of ammonia fuel exceeding 200 ppm, the PLC controller 30 sends a signal to open the first two-way solenoid valve 11, the second two-way solenoid valve 12, the fourth two-way solenoid valve 14, and the eighth two-way solenoid valve 18, and close the third two-way solenoid valve 13. High-pressure nitrogen gas at 3.0 MPa, input from the A! port of the high-pressure nitrogen pipe 101, sequentially passes through the first two-way solenoid valve 11, the fourth two-way solenoid valve 14, and the second one-way valve 22, then into the outer pipe of the ammonia fuel input double-wall pipe 105 via the ammonia fuel D1 input, and then through the outer pipe outlet of the ammonia fuel output double-wall pipe 106 via the ammonia fuel D2 output. It then sequentially passes through the eighth two-way solenoid valve 18, the ammonia detector 7, the exhaust fan 42, and then through the bypass terminal 83 of the three-way solenoid valve and the direct E2 terminal 82 of the three-way solenoid valve, finally carrying the leaked ammonia fuel into the outdoor ammonia vapor tank 20 via the connecting pipe 103. At the same time, the PLC controller 30 sends a signal to open the fifth two-way solenoid valve 15. High-pressure nitrogen gas passes through the fifth two-way solenoid valve 15 and the fifth one-way valve 25 in sequence, blowing the ammonia fuel leaking from the bottom D3 port 104 of the ammonia fuel engine 100 back to the ammonia vapor tank 20 for collecting ammonia fuel.

[0032] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A safety system for a low-speed ammonia-fueled engine test bench, comprising several two-way solenoid valves, several one-way valves, several pressure sensors, a blower, an exhaust fan, a manual two-way valve, a buffer tank, an ammonia detector, a three-way solenoid valve, and a flow meter located in the room housing the low-speed ammonia-fueled engine, and an ammonia vapor tank located outdoors; characterized in that, The low-pressure nitrogen pipe merges into a single connecting pipe after passing through the first two-way solenoid valve and the high-pressure nitrogen pipe after passing through the second two-way solenoid valve. This connecting pipe then branches into two separate lines after being connected sequentially to the fifth two-way solenoid valve and the fifth check valve. One connecting pipe connects to the nitrogen fuel leak pipe D3 port at the bottom of the ammonia fuel engine, while the other connecting pipe passes through the wall and connects to one end of the ammonia vapor tank. At the junction of the low-pressure and high-pressure nitrogen pipes, the connecting pipe further branches into two branches. One branch connects sequentially to the outer pipe of the D2 output double-walled pipe of the ammonia fuel low-speed engine after passing sequentially through the third two-way solenoid valve and the first check valve. The connecting pipe of the outer pipe of the D2 output double-walled pipe also sequentially passes through the eighth two-way solenoid valve, the ammonia detector, the exhaust fan, the bypass end of the three-way solenoid valve, and the three-way solenoid valve... The valve is directly connected to the E2 terminal, then passes through the wall and connects to the other end of the ammonia vapor tank; another branch passes through the fourth two-way solenoid valve and the second check valve in sequence, then splits into two branches. One branch's connecting pipe is connected to the outer pipe of the D1 input double-wall pipe of the ammonia fuel low-speed engine; the other branch passes through the sixth two-way solenoid valve, the third check valve, the flow meter, the buffer tank, the fourth check valve, and the air supply fan in sequence, and connects to the B2 port of the atmospheric input pipe at normal temperature and pressure; one end of the buffer tank is connected to the B1 port of the dry compressed air input pipe with a pressure of 0.7-1.0 MPa in sequence through the manual two-way valve and the seventh solenoid valve; the signal lines of the PLC controller are connected to the control terminals of each two-way solenoid valve, each pressure sensor, the air supply fan, the exhaust fan, and the flow meter.

2. The safety system for the ammonia fuel low-speed engine test stand as described in claim 1, characterized in that: The first pressure sensor is connected in parallel to the connecting pipeline where the first two-way solenoid valve and the second two-way solenoid valve meet; the second pressure sensor is connected in parallel to the connecting pipeline between the first check valve and the outer pipe of the D2 output double-walled pipe of the ammonia fuel low-speed engine; the third pressure sensor is connected in parallel to the connecting pipeline between the flow meter and the buffer tank.

3. The safety system for the ammonia fuel low-speed engine test stand as described in claim 1, characterized in that: The pressure of the low-pressure nitrogen pipe is 0.3 MPa, and the pressure of the high-pressure nitrogen pipe is 3.0 MPa.

4. The safety system for the ammonia fuel low-speed engine test stand as described in claim 1, characterized in that: The pressure detection range of the first, second, and third pressure sensors is 0–15 MPa, and the output current signal is 4–20 mA.

5. The safety system for the ammonia fuel low-speed engine test stand as described in claim 1, characterized in that: The ammonia detector has a measurement range of 0–1000 ppm and a measurement accuracy of ≤1 ppm; the output current signal is 4–20 mA.

6. The safety system for the ammonia fuel low-speed engine test stand as described in claim 1, characterized in that: The air volume of the blower is 60m³. 3 / h, the air volume of the exhaust fan is 40m³ / h. 3 / h.

7. The safety system for the ammonia fuel low-speed engine test stand as described in claim 1, characterized in that: The buffer tank has a capacity of 0.8–1.2 m³. 3 .

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