Detection and alarm system for combustible gas in gas pipeline

Abstract

The utility model relates to the technical field of instrument automatic control, in particular to a detection alarm system for combustible gas in a gas pipeline, and aims to solve the problems that when the concentration of the combustible gas in the gas pipeline is detected at present, due to the lack of a special efficient detection matching system, the combustible gas is not detected in time, the detection precision is low, and the detection cost is high. And finally, the overall gas transmission safety of the gas pipeline is greatly influenced. The system is mainly composed of a detector, a wire, a time relay, an alternating current contactor, an electromagnetic valve and the like, and the combustible gas detector participates in combustible gas alarm control sound and light alarm and participates in rapid electromagnetic valve linkage by continuously measuring whether a gas pipeline leaks or not and matching sound and light alarm, and the concentration of an alarm point is a set high-low limit value. The device can give an alarm in advance when the concentration of the leaked combustible gas is lower than the explosion lower limit in a protection area, so that fire and explosion accidents caused by leakage of the combustible gas are prevented, and equipment faults are effectively restrained.

Description

Technical Field

[0001] The utility model relates to the technical field of instrument automatic control, in particular to a detection and alarm system for combustible gas in a gas pipeline. Background Art

[0002] At present, the work of troubleshooting safety hazards in coking enterprises is mainly done through manual inspections, relying on people's professional knowledge and experience to discover safety hazards in production. This method is easily affected by subjective factors, and it is difficult to find leakage accidents and dangerous conditions, and the reliability is poor. Secondly, portable gas leak detectors can only find the source of leakage and take safety measures after the accident occurs, which cannot achieve the purpose of preventing and controlling accidents from the source. Therefore, it is of great significance to use intelligent leak detection technology to timely predict abnormal conditions such as early gas leakage caused by incorrect operation, process abnormalities, instrument failures, and equipment failures, especially for major hazardous sources. It can remotely, widely, and quickly accurately monitor the leakage point, concentration, range and change trend, so that operators can perform rescue operations in time to reduce the probability of accidents. Utility Model Content

[0003] The utility model provides a detection alarm system for combustible gas in a gas pipeline to solve the problems existing in the above background.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A detection alarm system for combustible gas in a gas pipeline comprises a first combustible gas detector and a second combustible gas detector connected in parallel to each other, the first combustible gas detector and the second combustible gas detector are both connected to a combustible gas alarm controller, the combustible gas alarm controller is respectively connected in parallel to a first time relay and a second time relay, the first time relay is connected to a first AC contactor, the second time relay is connected to a second AC contactor, the first AC contactor is connected to a first solenoid valve, and the second AC contactor is also connected to a second solenoid valve.

[0006] Furthermore, the first combustible gas detector, the second combustible gas detector and the combustible gas alarm controller are all connected via a first wire.

[0007] Furthermore, the output end of the combustible gas alarm controller is connected to a passive relay, and the first time relay and the second time relay are both connected to the passive relay via a second wire.

[0008] Furthermore, the models of the first combustible gas detector and the second combustible gas detector are both HRP-T1000, the combustible gas alarm controller is KII9000, the first time relay and the second time relay are both JS14P, the first AC contactor and the second AC contactor are both CJX2s-0911, the first solenoid valve and the second solenoid valve are both ZCRB, and the passive relay is JS14P.

[0009] The utility model has the following beneficial effects:

[0010] The utility model provides a detection alarm system for combustible gas in a gas pipeline, which is mainly composed of components such as a combustible gas detector, a connecting wire, a time relay, an AC contactor and a solenoid valve. It continuously measures whether the gas pipeline is leaking and has sound and light alarms. The alarm point concentration is the set low and high limit values. The combustible gas detector participates in the combustible gas alarm control sound and light alarms, and participates in the linkage of the rapid solenoid valve. It can ensure that the concentration of leaked combustible gas in the protection area is lower than the lower explosion limit and give an early alarm, thereby preventing the occurrence of fires and explosions caused by combustible gas leakage, effectively curbing equipment failures, and solving the problem that when detecting the combustible gas concentration in the gas pipeline, the combustible gas detection is usually untimely and the detection accuracy is low due to the lack of a dedicated and efficient detection supporting system, which ultimately has a great impact on the overall gas transmission safety of the gas pipeline.

[0011] In the utility model, when the combustible gas concentration in the environment reaches or exceeds the warning value, sound and light signals can be issued in time to warn the on-duty personnel to make correct judgments and operations. At the same time, the combustible gas alarm controller is used to detect the combustible gas content in the air, and multi-point centralized control can be realized. When the combustible gas concentration in the environment exceeds the warning value, the controller immediately drives the solenoid valve through the relay to prevent explosions and fire accidents, etc., effectively curbing the abnormal diffusion of gas in the gas pipeline and causing the occurrence of vicious production safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] The meanings of the reference numerals are as follows:

[0014] 1. The first combustible gas detector; 2. The second combustible gas detector; 3. The combustible gas alarm controller; 4. The first wire; 5. The passive relay; 6. The second wire; 7. The first time relay; 8. The second time relay; 9. The first AC contactor; 10. The second AC contactor; 11. The first solenoid valve; 12. The second solenoid valve. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] like Figure 1 As shown, a detection alarm system for combustible gas in a gas pipeline includes a first combustible gas detector 1 and a second combustible gas detector 2 connected in parallel to each other, the first combustible gas detector 1 and the second combustible gas detector 2 are both connected to a combustible gas alarm controller 3, the combustible gas alarm controller 3 is respectively connected to a first time relay 7 and a second time relay 8 in parallel, the first time relay 7 is connected to a first AC contactor 9, the second time relay 8 is connected to a second AC contactor 10, and the first AC contactor 9 is connected to a first solenoid valve 11, and the second AC contactor 10 is also connected to a second solenoid valve 12.

[0017] The first combustible gas detector 1 , the second combustible gas detector 2 and the combustible gas alarm controller 3 are all connected via a first wire 4 .

[0018] The output end of the combustible gas alarm controller 3 is connected to a passive relay 5 , and the first time relay 7 and the second time relay 8 are both connected to the passive relay 5 via a second wire 6 .

[0019] The first combustible gas detector 1 and the second combustible gas detector 2 convert the combustible gas concentration in the air into digital signals, and can output standard 4-20mA current signals, or two-wire and four-wire RS485 (MODBUS-RTU) signals. They are compatible with secondary instruments, PLC, DCS systems, and data acquisition modules, and have the characteristics of long transmission distance and good anti-interference performance.

[0020] The combustible gas alarm controller 3 is used to detect the combustible gas content in the air, supports four-bus detectors, and centrally controls multiple points at the same time. The system uses a microprocessor as a control unit. When the combustible gas concentration in the environment reaches or exceeds the preset value, the controller immediately sends out an audible and visual alarm, and drives the shut-off valve through the first time relay 7 and the second time relay 8 to prevent gas leakage, explosion, and fire accidents, thereby ensuring safety. The delay accuracy of the first time relay 7 and the second time relay 8 can reach 1%.

[0021] The first solenoid valve 11 and the second solenoid valve 12 are normally open pulse-triggered solenoid valves with accident self-locking and manual reset functions, the control mode is normally open, the power supply voltage is 220V-AC, the valve body material is stainless steel, the pressure range is 0-1.6MPa, and it has dust-proof, explosion-proof and waterproof properties. The valve is in a normally open state during daily work, the solenoid valve coil is in a power-off state, and does not consume electrical energy.

[0022] The working process of the utility model is as follows: the first combustible gas detector 1 and the second combustible gas detector 2 can continuously monitor the measurable combustible gas in the industrial environment, and convert the combustible gas concentration into a digital signal, which is transmitted to the combustible gas alarm controller 3, and the combustible gas alarm controller 3 identifies, displays and processes it. When the concentration of combustible gas in the environment reaches or exceeds the preset value, the combustible gas alarm controller 3 immediately sends out an audible and visual alarm, and delays the action by 2 seconds through the first time relay 7 and the second time relay 8, so that the first AC contactor 9 and the second AC contactor 10 respectively control the circuit to be energized, and the main contacts of the first AC contactor 9 and the second AC contactor 10 are closed, so that the coils of the first solenoid valve 11 and the second solenoid valve 12 are instantaneously energized, triggering the valve to close quickly and enter a self-locking state. At this time, even if the power is removed, the valve is still in a self-locking closed state and will not reopen automatically. After the operator has handled the fault, he manually reopens the valve and resumes the gas supply. The entire early warning process effectively prevents the occurrence of accidents such as fire and explosion caused by combustible gas leakage and avoids equipment failure. Therefore, the system has good practicality.

Claims

1. A detection and alarm system for combustible gas in a gas pipeline, characterized by: The invention comprises a first combustible gas detector (1) and a second combustible gas detector (2) connected in parallel with each other, the first combustible gas detector (1) and the second combustible gas detector (2) are both connected to a combustible gas alarm controller (3), the combustible gas alarm controller (3) is respectively connected in parallel with a first time relay (7) and a second time relay (8), the first time relay (7) is connected to a first AC contactor (9), the second time relay (8) is connected to a second AC contactor (10), the first AC contactor (9) is connected to a first solenoid valve (11), and the second AC contactor (10) is also connected to a second solenoid valve (12).

2. A detection and alarm system for combustible gas in a gas pipeline according to claim 1, characterized in that: The first combustible gas detector (1), the second combustible gas detector (2) and the combustible gas alarm controller (3) are all connected via a first wire (4).

3. The combustible gas detection and alarm system for gas pipelines according to claim 2 is characterized in that: The output end of the combustible gas alarm controller (3) is connected to a passive relay (5), and the first time relay (7) and the second time relay (8) are both connected to the passive relay (5) via a second wire (6).

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