CN105736953A - Pressure sensing based liquid ammonia pipeline leak detection system with cladding layer and detection method - Google Patents

Pressure sensing based liquid ammonia pipeline leak detection system with cladding layer and detection method Download PDF

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Publication number
CN105736953A
CN105736953A CN201610260148.8A CN201610260148A CN105736953A CN 105736953 A CN105736953 A CN 105736953A CN 201610260148 A CN201610260148 A CN 201610260148A CN 105736953 A CN105736953 A CN 105736953A
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China
Prior art keywords
pressure
electromagnetic valve
ammonia pipeline
pressure inductor
clad
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CN201610260148.8A
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CN105736953B (en
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曲方
胡凯
李二明
张亮
董林翰
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China Jiliang University
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China Jiliang University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17DPIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00Protection or supervision of installations
    • F17D5/02Preventing, monitoring, or locating loss

Abstract

The invention discloses a pressure sensing based liquid ammonia pipeline leak detection system with a cladding layer and a detection method. The pressure sensing based liquid ammonia pipeline leak detection system with the cladding layer comprises a cladding layer device, pressure sensors, cables, a liquid ammonia pipeline and a data processing system, wherein the cladding layer device wraps the liquid ammonia pipeline, an independent hermetic air chamber is formed in the cladding layer device, and the pressure sensors are mounted in the hermetic air chamber. When a specific position of the pipeline leaks, the pressure sensors transmit detection signals to the data processing system, and the data processing system computes to analyze the leaked position. The pressure sensing based liquid ammonia pipeline leak detection system is provided with a self-detecting unit for detecting line faults to guarantee normal running of the system. The pressure sensing based liquid ammonia pipeline leak detection system with the cladding layer has the advantages that the liquid ammonia pipeline leak detection system is simple in working circuit principle and is in the open-circuit state in absence of leak so as to be higher in safety; during leak, two effective data including single-stranded cable length and resistor disc resistance values of the pressure sensors can be detected, and long-distance liquid ammonia pipelines can be monitored by numbering a few sensors.

Description

A kind of liquefied ammonia pipeline leakage checking system with clad based on pressure sensitive and method thereof
Technical field
The present invention relates to liquefied ammonia pipeline leakage testing research field, particularly to a kind of based on liquefied ammonia pipeline leakage checking system with clad in the unconventional situation of pressure sensitive and method thereof.
Background technology
In recent years, along with the fast development of Chinese society economy, freezer is widely used in people's daily life as the instrument storing food and some specialities.Ammonia is as a kind of cold-producing medium (numbering R717) of cold storage refrigerating system, and its macroscopic property is best in ownership cryogen, is currently used a kind of medium temperature and medium pressure cold-producing medium.In the large and medium-sized cold storage refrigerating system of China, ammonia is adopted to account for more than 80% as cold-producing medium.
Measuring gas parameter based on pressure sensitive is a kind of safe and efficient measurement technology.It shows different metering systems according to other physical characteristics.But when working environment is the liquefied ammonia pipeline with clad, traditional pressure detecting just faces a comparatively pickle.By the improvement to the design and pressure inductor that detect circuit, rely on computer technology, overcome the difficult problem causing that conventional pressure induction instrument aratus cannot be measured, the monitoring in real time when leakage occurs the liquefied ammonia pressure pipeline with clad and location can be completed simultaneously.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, it is proposed that the system of a kind of liquefied ammonia pipeline leakage testing with clad based on pressure sensitive and method thereof.
A kind of liquefied ammonia pipeline leakage checking system with clad based on pressure sensitive includes clad device, pressure inductor, cable, liquefied ammonia pipeline and data and processes system;
It is peripheral that described clad device is wrapped in liquefied ammonia pipeline, clad device includes clad, insulating element, supporting member, insulating element is arranged between clad and liquefied ammonia pipeline, space between clad and liquefied ammonia pipeline is divided into mutually isolated sealed gas chamber, is provided with between insulating element for ensureing the supporting member of free flow of gas in sealed gas chamber;
Described cable includes several first electromagnetic valves, the resistance being connected with the first electromagnetic valve, connecting line and the control switch being connected with pressure inductor;The first described electromagnetic valve is by the control of data handling system;
One pressure transducer and the control switch being connected with this sensor constitute a pressure inductor unit, one the first electromagnetic valve and coupled resistance constitute a self-test unit, one pressure inductor unit and a self-test unit are installed in each sealed gas chamber
Described data handling system includes the mechanical, electrical stream table of pc, regulated power supply, the second electromagnetic valve, the 3rd electromagnetic valve;
Described all pressure sensor unit are connected in parallel, and the pressure sensor unit after being connected in parallel and ammeter, regulated power supply, the 3rd electromagnetic valve are connected into loop;The described self-test unit in same sealed gas chamber and pressure inductor unit are connected in parallel, and one end of the second described electromagnetic valve is connected with regulated power supply, and the other end switchs with the control of all of pressure sensor unit respectively and the first electromagnetic valve is connected;
Described pc machine is connected with ammeter, regulated power supply, the second electromagnetic valve, the 3rd electromagnetic valve and all of first electromagnetic valve.
Preferably, described pressure inductor includes shell., sheet rubber., resistor disc., electric wire. with two sheet metals, described electric wire. with shell. close contact, it is divided into two strands, two strands are connected with two sheet metals respectively, described sheet rubber. with shell. seamless contact, and make the gas having certain air pressure inside induction apparatus.Sheet rubber. inner side and resistor disc. close contact, sheet rubber. outside is exposed in sealed gas chamber, hinders sheet. and between sheet metal, it is provided with distance.
Preferably, the described resistor disc in different pressure inductor unit. resistance different, the described resistance in different self-test unit is different.
Preferably, described connecting line is triple core wire, the first electromagnetic valve. there is two lugs zero line on cable to be connected with live wire.
Preferably, described electric wire. two strands of a strand and connecting line be connected, electric wire. one remaining with connecting line of another strand be connected.
Described shell incombustible material is made, and be hollow structure in the middle of shell, shell upper ledge and electric wire seamless link, and enclosure stretches out a part, makes electric wire be deep into inside;
Described sheet rubber and enclosure tight bond, and enclosure is isolated the gas containing certain air pressure, with resistor disc compact siro spinning technology inside sheet rubber;
Described regulated power supply provides stable voltage for whole observation circuit;
The second described electromagnetic valve accepts the signal that computer system sends when circuit pathways, makes valve Guan Bi provide safeguard for second group of data of systematic survey;
Twice size of current by circuit measured by described ammeter when circuit pathways, provides foundation for computer system analysis leakage situation;
Described computer system receives the data added up by ammeter, and calculates the pressure inductor model having an effect and position according to the calculation procedure set, and gives a warning to staff simultaneously.
The detection method of described liquefied ammonia pipeline leakage checking system comprises the following steps:
After step 1, liquefied ammonia pipeline leak, the liquefied ammonia of internal high pressure can discharge from leakage point rapidly and the pressure within the sealed gas chamber causing each independent that gasifies rises;
Step 2, pressure inductor is under the effect of gases at high pressure, sheet rubber produces the dynamic resistor disc of deformation band and is gradually increasing until contacting with the sheet metal on top, the i.e. switch of control in pressure sensor unit Guan Bi, so that the circuit ON path of this pressure inductor place pressure inductor unit, turn on for the first pressure inductor unit, i.e. " regulated power supply-ammeter-three electromagnetic valves-resistor disc 1-controls switch 1-regulated power supply " circuit ON path, in pressure inductor, the distance between resistor disc and sheet metal can be determined according to method calculated as below:
h = k n R T S · Δ P P 0 ( P 0 + Δ P )
In formula: the distance between h-pressure inductor resistor disc and sheet metal;
The area of S-pressure inductor sheet rubber;
The change value of pressure of Δ P-pressure inductor work;
P0The force value that-pressure inductor is initial;
The amount of gaseous matter in n-pressure transducer;
K-correction factor;
R-gas constant;
T-absolute temperature;
Step 3, under the effect of regulated power supply, the resistor disc within pressure inductor can make circuit produce specific current value I1, current value I1Recorded by ammeter and be sent to pc machine, then pc machine controls the second electromagnetic valve work so that connecting line between regulated power supply with pressure inductor in parallel upper one just as connecting line, owing to connecting line exists internal resistance, make electric current in circuit send change, produce current value I2, current value I2Recorded by ammeter and be sent to pc machine;
Step 4, different current values are collected by pc machine, and the size according to electric current calculates the mounting distance L of pressure transducer in circuit and the resistance R of induction apparatus resistor disciOwing to the length of cable between each pressure transducer from data handling system (5) is different, and the resistance of each pressure transducer is not bitterly, may thereby determine that the position occurring to reveal the pressure inductor of sealed gas chamber, and monitoring personnel are given a warning, by reasoning abbreviation its
L = 2 S ρ ( U I 1 - U I 2 )
Computational methods are:
R i = 4 U I 2 - 3 U I 1
In formula: RiThe resistance value of-pressure inductor resistor disc, i takes 1,2....n;
The voltage of U-regulated power supply;
I1-electromagnetic valve do not work before the current value that passes through of circuit;
I2The current value that after-electromagnetic valve work, circuit passes through;
The mounting distance L of pressure transducer in L-operating circuit;
The sectional area of S-cable;
The resistivity of ρ-cable;
Step 5, as current value I1And I2When being uploaded to pc machine, pc machine sends instruction to the 3rd electromagnetic valve being positioned at circuit main line, 3rd electromagnetic valve disconnecting circuit, make system be in no power state thus ensure leak after will not produce accident potential, after technical staff repairs liquefied ammonia pipeline, by pc machine, the 3rd electromagnetic valve is returned to original state;
The first electromagnetic valve that step 6, computer are pointed on clad inside cable sends instruction, allows all first electromagnetic valves gradually work from proximal and distal, checks the integrity of circuit, and after confirming that circuit is intact, system is in detection state again.
The present invention has the advantage that relative to prior art
(1) present invention isolates clad and can play, at the independent closed cavity that liquefied ammonia pipeline external is formed, the effect that enhancing is heat insulation.
(2) pressure inductor of invention in the present invention, has as the end induction apparatus of monitoring system that making is simple, it is sensitive to reflect, resistance characteristic is different, it is simple to make the pressure inductor of different model.
(3) circuit theory of present invention work is simple and easy, and when not occurring to leak, circuit is in off state, improves the safety of system.Sub-thread length of cable and two valid data of pressure inductor resistor disc resistance can be recorded during leakage, it is possible to use less induction apparatus numbering just can be monitored the pipeline of distance liquefied ammonia simultaneously.
(4) present invention utilizes computer system, it is possible to achieve to generating date and warning in time, and be easy to the statistical work of liquefied ammonia pipeline leakage situation data.
(5) the practical general cable of the present invention is as signal transmssion line, and arrange detection cable at cable has unabroken equipment to can ensure that monitoring effect simultaneously, it is simple to daily maintenance work.
Accompanying drawing explanation
Fig. 1 is one liquefied ammonia pipeline leakage checking system schematic diagram of the present invention;
Fig. 2 is operation principle circuit diagram in the present invention;
Fig. 3 is pressure inductor structural representation in the present invention;
Fig. 4 is that in the present invention, schematic diagram arranged by liquefied ammonia pipeline leakage testing element
Fig. 5 is the flow chart of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
The liquefied ammonia pipeline leakage checking system with clad based on pressure sensitive such as Fig. 1-4 present invention includes clad device 1, pressure inductor 2, cable 3, liquefied ammonia pipeline 4 and data handling system 5;
It is peripheral that described clad device 1 is wrapped in liquefied ammonia pipeline 4, clad device 1 includes clad 1.1, insulating element 1.2, supporting member 1.3, insulating element 1.2 is arranged between clad 1.1 and liquefied ammonia pipeline 4, space between clad 1.1 and liquefied ammonia pipeline 4 is divided into mutually isolated sealed gas chamber, the supporting member 1.3 for ensureing free flow of gas in sealed gas chamber is installed between insulating element 1.2;
Described cable 3 includes several first electromagnetic valves 3.1, the resistance being connected with the first electromagnetic valve 3.1, connecting line and the control switch being connected with pressure inductor 2;The first described electromagnetic valve 3.1 is by the control of data handling system 5;
One pressure transducer and the control switch being connected with this sensor constitute a pressure inductor unit, one the first electromagnetic valve 3.1 and coupled resistance constitute a self-test unit, one pressure inductor unit and a self-test unit are installed in each sealed gas chamber
Described data handling system 5 includes pc machine 5.1, ammeter 5.2, regulated power supply the 5.3, second electromagnetic valve the 5.4, the 3rd electromagnetic valve 5.5;
Described all pressure sensor unit are connected in parallel, and the pressure sensor unit after being connected in parallel and ammeter 5.2, regulated power supply the 5.3, the 3rd electromagnetic valve 5.5 are connected into loop;The described self-test unit in same sealed gas chamber and pressure inductor unit are connected in parallel, one end of the second described electromagnetic valve 5.4 is connected with regulated power supply 5.3, and the other end switchs with the control of all of pressure sensor unit respectively and the first electromagnetic valve 3.1 is connected;
Described pc machine 5.1 is connected with ammeter 5.2, regulated power supply the 5.3, second electromagnetic valve the 5.4, the 3rd electromagnetic valve 5.5 and all of first electromagnetic valve 3.1.
Preferably, described pressure inductor 2 includes shell 2.1, sheet rubber 2.2, resistor disc 2.3, electric wire 2.4 and two sheet metals, described electric wire 2.4 is in close contact with shell 2.1, it is divided into two strands, two strands are connected with two sheet metals respectively, described sheet rubber 2.2 is seamless with shell 2.1 to be contacted, and makes the gas having certain air pressure inside induction apparatus.It is in close contact with resistor disc 2.3 inside sheet rubber 2.2, is exposed in sealed gas chamber outside sheet rubber 2.2, between resistance sheet 2.3 and sheet metal, be provided with distance.
Preferably, the resistance of the described resistor disc 2.3 in different pressure inductor unit is different, and the described resistance in different self-test unit is different.
Preferably, described connecting line is triple core wire, and the first electromagnetic valve 3.1 has two lugs zero line on cable 3 to be connected with live wire.
Preferably, a strand of described electric wire 2.4 is connected with two strands of connecting line, and one remaining with connecting line of another strand of electric wire 2.4 is connected.
Described pc machine 5.1 can carry out data with ammeter the 5.2, second electromagnetic valve 5.4 and the 3rd electromagnetic valve 5.5 and upload and instruction issues.
Described ammeter 5.2 is positioned on the main line of circuit, it is possible to record the size of electric current in circuit.
Described regulated power supply 5.3 can provide stable voltage for whole monitoring system.
The second described electromagnetic valve 5.4 and the 3rd electromagnetic valve 5.5 complete residing open circuit, tripping action according to the instruction of pc machine.
As it is shown in figure 5, the liquefied ammonia pipeline leakage checking system with clad of a kind of pressure sensitive, specific works principle comprises the following steps:
After step 1, liquefied ammonia pipeline leak, the liquefied ammonia of internal high pressure can discharge from leakage point rapidly and the pressure within the sealed gas chamber causing each independent that gasifies rises;
Step 2, pressure inductor is under the effect of gases at high pressure, sheet rubber produces the dynamic resistor disc of deformation band and is gradually increasing until contacting with the sheet metal on top, the i.e. switch of control in pressure sensor unit Guan Bi, so that the circuit ON path of this pressure inductor place pressure inductor unit, turn on for the first pressure inductor unit, i.e. " regulated power supply-ammeter-three electromagnetic valves-resistor disc 1-controls switch 1-regulated power supply " circuit ON path, in pressure inductor, the distance between resistor disc and sheet metal can be determined according to method calculated as below:
h = k n R T S . Δ P P 0 ( P 0 + Δ P )
In formula: the distance between h-pressure inductor resistor disc and sheet metal;
The area of S-pressure inductor sheet rubber;
The change value of pressure of Δ P-pressure inductor work;
P0The force value that-pressure inductor is initial;
The amount of gaseous matter in n-pressure transducer;
K-correction factor;
R-gas constant;
T-absolute temperature;
Step 3, under the effect of regulated power supply, the resistor disc within pressure inductor can make circuit produce specific current value I1, current value I1Recorded by ammeter and be sent to pc machine, then pc machine controls the second electromagnetic valve work so that connecting line between regulated power supply with pressure inductor in parallel upper one just as connecting line, owing to connecting line exists internal resistance, make electric current in circuit send change, produce current value I2, current value I2Recorded by ammeter and be sent to pc machine;
Step 4, different current values are collected by pc machine, and the size according to electric current calculates the mounting distance L of pressure transducer in circuit and the resistance R of induction apparatus resistor disciOwing to the length of cable between each pressure transducer from data handling system (5) is different, and the resistance of each pressure transducer is not bitterly, may thereby determine that the position occurring to reveal the pressure inductor of sealed gas chamber, and monitoring personnel are given a warning, by its computational methods of reasoning abbreviation it is:
L = 2 S ρ ( U I 1 - U I 2 )
R i = 4 U I 2 - 3 U I 1
In formula: RiThe resistance value of-pressure inductor resistor disc, i takes 1,2....n;
The voltage of U-regulated power supply;
I1-electromagnetic valve do not work before the current value that passes through of circuit;
I2The current value that after-electromagnetic valve work, circuit passes through;
The mounting distance L of pressure transducer in L-operating circuit;
The sectional area of S-cable;
The resistivity of ρ-cable;
Step 5, as current value I1And I2When being uploaded to pc machine, pc machine sends instruction to the 3rd electromagnetic valve being positioned at circuit main line, 3rd electromagnetic valve disconnecting circuit, make system be in no power state thus ensure leak after will not produce accident potential, after technical staff repairs liquefied ammonia pipeline, by pc machine, the 3rd electromagnetic valve is returned to original state;
The first electromagnetic valve that step 6, computer are pointed on clad inside cable sends instruction, allows all first electromagnetic valves gradually work from proximal and distal, checks the integrity of circuit, and after confirming that circuit is intact, system is in detection state again.

Claims (6)

1. the liquefied ammonia pipeline leakage checking system with clad based on pressure sensitive, it is characterised in that include clad device (1), pressure inductor (2), cable (3), liquefied ammonia pipeline (4) and data handling system (5);
It is peripheral that described clad device (1) is wrapped in liquefied ammonia pipeline (4), clad device (1) includes clad (1.1), insulating element (1.2), supporting member (1.3), insulating element (1.2) is arranged between clad (1.1) and liquefied ammonia pipeline (4), space between clad (1.1) and liquefied ammonia pipeline (4) is divided into mutually isolated sealed gas chamber, the supporting member (1.3) for ensureing free flow of gas in sealed gas chamber is installed between insulating element (1.2);
Described cable (3) includes resistance that several first electromagnetic valves (3.1) are connected, connecting line and the control switch being connected with pressure inductor (2) with the first electromagnetic valve (3.1);Described the first electromagnetic valve (3.1) is by the control of data handling system (5);
One pressure transducer and the control switch being connected with this sensor constitute a pressure inductor unit, one the first electromagnetic valve (3.1) and coupled resistance constitute a self-test unit, one pressure inductor unit and a self-test unit are installed in each sealed gas chamber
Described data handling system (5) includes pc machine (5.1), ammeter (5.2), regulated power supply (5.3), the second electromagnetic valve (5.4), the 3rd electromagnetic valve (5.5);
Described all pressure sensor unit are connected in parallel, and the pressure sensor unit after being connected in parallel and ammeter (5.2), regulated power supply (5.3), the 3rd electromagnetic valve (5.5) are connected into loop;The described self-test unit in same sealed gas chamber and pressure inductor unit are connected in parallel, one end of described the second electromagnetic valve (5.4) is connected with regulated power supply (5.3), and the other end switchs with the control of all of pressure sensor unit respectively and the first electromagnetic valve (3.1) is connected;
Described pc machine (5.1) is connected with ammeter (5.2), regulated power supply (5.3), the second electromagnetic valve (5.4), the 3rd electromagnetic valve (5.5) and all of first electromagnetic valve (3.1).
2. the liquefied ammonia pipeline leakage checking system with clad based on pressure sensitive according to claim 1, it is characterized in that described pressure inductor (2) includes shell (2.1), sheet rubber (2.2), resistor disc (2.3), electric wire (2.4) and two sheet metals, described electric wire (2.4) and shell (2.1) close contact, it is divided into two strands, two strands are connected with two sheet metals respectively, described sheet rubber (2.2) is seamless with shell (2.1) to be contacted, and makes the gas having certain air pressure inside induction apparatus.Sheet rubber (2.2) inner side and resistor disc (2.3) close contact, sheet rubber (2.2) outside is exposed in sealed gas chamber, is provided with distance between resistance sheet (2.3) and sheet metal.
3. the liquefied ammonia pipeline leakage checking system with clad based on pressure sensitive according to claim 1, it is characterized in that the resistance of resistor disc (2.3) in described different pressure inductor unit is different, the described resistance in different self-test unit is different.
4. the liquefied ammonia pipeline leakage checking system with clad based on pressure sensitive according to claim 1, it is characterized in that described connecting line is triple core wire, the first electromagnetic valve (3.1) has two lugs zero line on cable (3) to be connected with live wire.
5. the liquefied ammonia pipeline leakage checking system with clad based on pressure sensitive according to claim 2, it is characterized in that a described strand of electric wire (2.4) is connected with two strands of connecting line, one remaining with connecting line of another strand of electric wire (2.4) is connected.
6. the detection method of liquefied ammonia pipeline leakage checking system as described in any one of claim 1-5, it is characterised in that comprise the following steps:
After step 1, liquefied ammonia pipeline leak, the liquefied ammonia of internal high pressure can discharge from leakage point rapidly and the pressure within the sealed gas chamber causing each independent that gasifies rises;
Step 2, pressure inductor are under the effect of gases at high pressure, sheet rubber produces the dynamic resistor disc of deformation band and is gradually increasing until contacting with the sheet metal on top, the i.e. switch of control in pressure sensor unit Guan Bi, so that the circuit ON path of this pressure inductor place pressure inductor unit, in pressure inductor, the distance between resistor disc and sheet metal can be determined according to method calculated as below:
h = k n R T S . Δ P P 0 ( P 0 + Δ P )
In formula: the distance between h-pressure inductor resistor disc and sheet metal;
The area of S-pressure inductor sheet rubber;
The change value of pressure of Δ P-pressure inductor work;
P0The force value that-pressure inductor is initial;
The amount of gaseous matter in n-pressure transducer;
K-correction factor;
R-gas constant;
T-absolute temperature;
Step 3, under the effect of regulated power supply, the resistor disc within pressure inductor can make circuit produce specific current value I1, current value I1Recorded by ammeter and be sent to pc machine, then pc machine controls the second electromagnetic valve work so that connecting line between regulated power supply with pressure inductor in parallel upper one just as connecting line, owing to connecting line exists internal resistance, make electric current in circuit send change, produce current value I2, current value I2Recorded by ammeter and be sent to pc machine;
Step 4, different current values are collected by pc machine, and the size according to electric current calculates the mounting distance L of pressure transducer in circuit and the resistance R of induction apparatus resistor disciOwing to the length of cable between each pressure transducer from data handling system (5) is different, and the resistance of each pressure transducer is not bitterly, may thereby determine that the position occurring to reveal the pressure inductor of sealed gas chamber, and monitoring personnel are given a warning, by its computational methods of reasoning abbreviation it is:
L = 2 S ρ ( U I 1 - U I 2 )
R i = 4 U I 2 - 3 U I 1
In formula: RiThe resistance value of-pressure inductor resistor disc, i takes 1,2....n;
The voltage of U-regulated power supply;
I1-electromagnetic valve do not work before the current value that passes through of circuit;
I2The current value that after-electromagnetic valve work, circuit passes through;
The mounting distance L of pressure transducer in L-operating circuit, the i.e. length of cable between pressure transducer and power supply;
The sectional area of S-cable;
The resistivity of ρ-cable;
Step 5, as current value I1And I2When being uploaded to pc machine, pc machine sends instruction to the 3rd electromagnetic valve being positioned at circuit main line, 3rd electromagnetic valve disconnecting circuit, make system be in no power state thus ensure leak after will not produce accident potential, after technical staff repairs liquefied ammonia pipeline, by pc machine, the 3rd electromagnetic valve is returned to original state;
The first electromagnetic valve that step 6, computer are pointed on clad inside cable sends instruction, allows all first electromagnetic valves gradually work from proximal and distal, checks the integrity of circuit, and after confirming that circuit is intact, system is in detection state again.
CN201610260148.8A 2016-04-22 2016-04-22 A kind of the liquefied ammonia pipeline leakage checking system with clad and its method based on pressure sensitive Active CN105736953B (en)

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CN108224089A (en) * 2017-12-08 2018-06-29 张卫社 The cylindric load-carrying construction of break-make type explosion early warning detection cable is installed
CN108844699A (en) * 2018-03-07 2018-11-20 福州艾弗斯智能科技有限公司 A kind of hydrogen energy automobile pipeline self-checking unit
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CN111569559A (en) * 2020-05-23 2020-08-25 河北化工医药职业技术学院 Waste gas purification dust-free environment-friendly gas leakage monitoring system of dihydrate gypsum production line

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