Lightning protection grounding system for coke oven coal gas area and working method

Abstract

The invention relates to the technical field of lightning protection grounding detection, and particularly discloses a coke oven coal gas area lightning protection grounding system and a working method.The coke oven coal gas area lightning protection grounding system comprises a detection box and a detection coil, a lithium battery is connected and supplies power to a control mainboard, a voltage stabilizing circuit is connected with a power supply selection circuit, and the power supply selection circuit is connected with a lithium battery charging circuit; the lithium battery charging circuit is connected with the reference power supply circuit, the reference power supply circuit is connected with the detection comparison circuit, the detection comparison circuit is connected with the early warning output circuit and the resistance test interface, the resistance test interface is connected with the detection coil, and the detection coil is arranged outside a shell of the detection box and installed outside a grounding piece. The detection coil detects the resistance value of the grounding piece and transmits the resistance value to the detection comparison circuit. The detection comparison circuit identifies the resistance value of the grounding piece and controls the early warning output circuit to give alarms of different levels. Point inspection and maintenance of regional inspection personnel are facilitated, so that the intrinsic safety of workers is ensured, real-time online detection is realized, and the detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of lightning protection grounding detection, and in particular to a lightning protection grounding system and a working method for a coke oven coal gasification area. Background Art

[0002] In general lightning protection grounding devices, grounding parts mostly use practical flat steel or round steel as grounding electrodes buried in the soil for down conductors. When the grounding resistance of the down conductor needs to be detected, a special resistance meter is required for manual measurement; in the field of chemical production, the grounding resistance of various production towers, factory buildings, pipe corridors and other buildings needs to be measured regularly, and their resistance values ​​must always meet the requirements. The coke oven coal gasification area is a production area with a high safety and explosion-proof level. It is necessary to ensure that the resistance value of the grounding resistance of the above-mentioned buildings is less than a certain value (4 ohms) at all times to meet the production safety requirements. Therefore, it is very necessary to invent and install a lightning protection grounding system that can detect grounding resistance in explosion-proof areas. The existing detection method is inefficient and cannot achieve real-time detection. Therefore, it is necessary to design a lightning protection grounding system and working method for the coke oven coal gasification area to solve the problems of low efficiency of existing manual measurement and failure to timely discover safety hazards in lightning protection grounding parts. Summary of the invention

[0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a coke oven coal gasification area lightning protection grounding system and working method. For a coal gasification production area with nearly a thousand lightning protection grounding points, it is very necessary to ensure the reliable operation of the grounding resistance at all times.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a coke oven coal gasification area lightning protection grounding system, including a detection box and a detection coil, a control mainboard and a lithium battery are arranged in the detection box, the lithium battery is connected to and supplies power to the control mainboard, the control mainboard includes a lithium battery charging circuit, a power selection circuit, a voltage stabilizing circuit, a reference voltage circuit, a detection comparison circuit, an early warning output circuit and a resistance test interface, the voltage stabilizing circuit is connected to the power selection circuit, the power selection circuit is connected to the lithium battery charging circuit, the lithium battery charging circuit is connected to the reference power circuit, the reference power circuit is connected to the detection comparison circuit, the detection comparison circuit is connected to the early warning output circuit and the resistance test interface, the resistance test interface is connected to the detection coil, the detection coil is arranged outside the shell of the detection box, the detection coil is installed outside the grounding piece, the detection coil detects the resistance value on the grounding piece and transmits it to the detection comparison circuit, the detection comparison circuit identifies the resistance value of the grounding piece and controls the early warning output circuit to issue different levels of alarms.

[0005] Specifically, the lithium battery charging circuit is provided with a charging interface and a charging battery management chip TP4056X. The charging battery management chip TP4056X is connected to the charging interface, and the charging battery management chip TP4056X provides a 5V voltage for the reference voltage circuit.

[0006] Specifically, the power selection circuit is provided with a field effect transistor IRF5210 and a battery interface, the battery interface is connected to a lithium battery, and the field effect transistor IRF5210 selects an external 220V power supply or a lithium battery power supply.

[0007] Specifically, the voltage stabilizing circuit is provided with a synchronous boost DC-DC converter chip PW5100, and the synchronous boost DC-DC converter chip PW5100 stabilizes the power supply circuit to keep the output voltage substantially unchanged when the input voltage fluctuates or the load changes.

[0008] Specifically, the reference power supply circuit includes an operational amplifier LM324AD and a voltage reference IC chip LM4041CIM3-ADJ. The operational amplifier LM324AD and the voltage reference IC chip LM4041CIM3-ADJ control circuit are not affected by the power supply voltage to form a reference power supply.

[0009] Specifically, the detection comparison circuit is provided with two groups of operational amplifiers LM324AD, which form a comparator circuit. The two groups of operational amplifiers LM324AD judge the current resistance value of the grounding component collected by the detection coil and the set resistance value. The resistance value set in the detection comparison circuit is 4 ohms and 10 ohms.

[0010] Specifically, the resistance test interface is provided with a wiring terminal, and the wiring terminal is connected to the detection coil.

[0011] Specifically, the early warning output circuit connects no alarm light, a first-level alarm light, a second-level alarm light, a third-level alarm light and a buzzer. The buzzer is installed on the detection box. The no alarm light, a first-level alarm light, a second-level alarm light and a third-level alarm light are installed on the front panel of the detection box. The second-level alarm light and the third-level alarm light use the same alarm light.

[0012] Specifically, the detection coil is installed on the grounding piece through a clamp or an elastic clamp, and the grounding piece is round steel or flat steel.

[0013] A working method of a coke oven coal gasification area lightning protection grounding system comprises the following steps:

[0014] S1. The detection box is installed on the grounding piece through the fixed installation structure of the detection coil, and the detection coil collects the resistance value of the grounding piece;

[0015] S2. When the detection coil detects that the resistance value of the lightning protection grounding component is less than or equal to 4 ohms, the detection box does not sound an alarm and no alarm light comes on;

[0016] S3. When the detection coil detects that the resistance value of the lightning protection grounding piece is greater than 4 ohms and less than or equal to 10 ohms, the detection box will issue a first-level alarm and the first-level alarm light will be on;

[0017] S4. When the detection coil detects that the resistance value of the lightning protection grounding piece is greater than 10 ohms, the detection box will issue a second-level alarm and the second-level alarm light will be on;

[0018] S5. When the detection coil detects that the resistance value of the lightning protection grounding component is infinite, that is, the flat steel or round steel is disconnected from the earth grounding body, the detection box will issue a three-level alarm, the three-level alarm light will light up and the buzzer will sound.

[0019] The present invention has the following beneficial effects:

[0020] The coke oven coal gasification area lightning protection grounding system and working method designed in the present invention can not only replace the traditional building lightning protection grounding system, but also have the function of real-time detection of grounding resistance value, and can issue early warning prompts to facilitate inspection and maintenance by regional inspection personnel, thereby ensuring the inherent safety of building buildings, towers, pipe corridors and staff, real-time online detection, and improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the structural block diagram of the lightning protection and grounding system in the coke oven coal gasification area.

[0022] Figure 2 This is the circuit structure diagram of the lightning protection grounding system in the coke oven coal gasification area Figure 1 .

[0023] Figure 3 This is the circuit structure diagram of the lightning protection grounding system in the coke oven coal gasification area Figure 2 .

[0024] Figure 4 This is a front view of the detection box installed on the grounding piece.

[0025] Figure 5 It is a side view of the fixing structure of the detection coil installed on the grounding member according to the first embodiment.

[0026] Figure 6 It is a top view of the fixing structure of the detection coil installed on the grounding member according to the first embodiment.

[0027] In the figure: 1-lithium battery charging circuit; 2-power supply selection circuit; 3-voltage stabilizing circuit; 4-reference voltage circuit; 5-detection comparison circuit; 6-early warning output circuit; 7-resistance detection interface; 8-detection box, 8.1-no alarm light, 8.2-first level alarm light, 8.3-second level alarm light, 8.4-third level alarm light, 8.5-buzzer; 9-detection coil, 9.1-fixing ear plate one, 9.2-fixing ear plate two, 9.3-fastening bolt; 10-grounding piece. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] like Figure 1-Figure 6 As shown, a coke oven coal gasification area lightning protection grounding system includes a detection box 8 and a detection coil 9. A control mainboard and a lithium battery are arranged in the detection box 8. The lithium battery is connected to and supplies power to the control mainboard. The control mainboard includes a lithium battery charging circuit 1, a power selection circuit 2, a voltage stabilizing circuit 3, a reference voltage circuit 4, a detection comparison circuit 5, an early warning output circuit 6 and a resistance test interface 7. The voltage stabilizing circuit 3 is connected to the power selection circuit 2, the power selection circuit 2 is connected to the lithium battery charging circuit 1, the lithium battery charging circuit 1 is connected to the reference power circuit 4, the reference power circuit 4 is connected to the detection comparison circuit 5, the detection comparison circuit 5 is connected to the early warning output circuit 6 and the resistance test interface 7, the resistance test interface 7 is connected to the detection coil 9, the detection coil 9 is arranged outside the shell of the detection box 8, the detection coil 9 is installed outside the grounding piece 10, the detection coil 9 detects the resistance value on the grounding piece 10 and transmits it to the detection comparison circuit 5, the detection comparison circuit 5 identifies the resistance value of the grounding piece 10 and controls the early warning output circuit 6 to issue different levels of alarms.

[0030] The lithium battery charging circuit 1 is provided with a charging interface and a charging battery management chip TP4056X. The charging battery management chip TP4056X is connected to the charging interface. The charging battery management chip TP4056X provides a 5V voltage for the reference voltage circuit. The charging interface adopts a USB tyepe-C / micro interface with a 5V voltage input to power or charge the device.

[0031] The power selection circuit 2 is provided with a field effect tube IRF5210 and a battery interface. The battery interface is connected to a lithium battery. The field effect tube IRF5210 selects an external 220V power supply or a lithium battery power supply. The power supply is selected according to the power supply mode. When an external 220V power supply is connected, the external 220V power supply is selected; when there is no external 220V power supply, the built-in lithium battery power supply is used.

[0032] The voltage stabilizing circuit 3 is provided with a synchronous boost DC-DC converter chip PW5100. The synchronous boost DC-DC converter chip PW5100 stabilizes the power supply circuit and keeps the output voltage substantially unchanged when the input voltage fluctuates or the load changes.

[0033] The reference power supply circuit 4 includes an operational amplifier LM324AD and a voltage reference IC chip LM4041CIM3-ADJ. The operational amplifier LM324AD and the voltage reference IC chip LM4041CIM3-ADJ control circuit generate a relatively accurate reference power supply that is not affected by the power supply voltage.

[0034] The detection comparison circuit 5 is provided with two groups of operational amplifiers LM324AD, which form a comparator circuit. The two groups of operational amplifiers LM324AD judge the current resistance value of the grounding component collected by the detection coil and the set resistance value. The resistance value set in the detection comparison circuit is 4 ohms and 10 ohms.

[0035] The resistance test interface 7 is provided with a connection terminal WJ2EDGV-5.08-8P, and the connection terminal is connected to the detection coil 9.

[0036] The early warning output circuit 6 connects the no alarm light 8.1, the first-level alarm light 8.2, the second-level alarm light 8.3, the third-level alarm light 8.4 and the bee 8.3. The third-level alarm light 8.4 is installed on the front panel of the detection box 8. The second-level alarm light 8.3 and the third-level alarm light 8.4 use the same color alarm lights, both are blue LED lights, the no alarm light 8.1 is a green LED light, and the first-level alarm light 8.2 is a red LED light.

[0037] The grounding piece 10 is round steel or flat steel. Embodiment 1 of the mounting structure of the detection coil 9 adopts a clamp structure. A notch is provided on the outer side of the detection coil 9. A fixing ear plate 1 9.1 and a fixing ear plate 2 9.2 are respectively fixedly installed on both sides of the notch of the detection coil 9. Both the fixing ear plate 1 9.1 and the fixing ear plate 2 9.2 are provided with bolt through holes. Fastening bolts 9.3 pass through the bolt through holes. The fastening bolts 9.3 control the detection coil 9 to be clamped and fixed on the grounding piece 10.

[0038] The second embodiment of the installation structure of the detection coil 9 adopts an elastic clamp structure, which is similar to the front clamp structure of the card flow meter and is installed on the grounding member 10 through the elastic clamp structure.

[0039] A working method of a coke oven coal gasification area lightning protection grounding system comprises the following steps:

[0040] 1. The detection box 8 is installed on the grounding member 10 through the fixed installation structure of the detection coil 9, and the detection coil 9 collects the resistance value of the grounding member 10.

[0041] 2. When the detection coil 9 detects that the resistance value of the lightning protection grounding component 10 is less than or equal to 4 ohms, the detection box 8 does not issue an alarm, and the non-alarm light 8.1 lights up green.

[0042] 3. When the detection coil 9 detects that the resistance value of the lightning protection grounding component 10 is greater than 4 ohms and less than or equal to 10 ohms, the detection box 8 issues a first-level alarm, and the first-level alarm light 8.2 lights up in red.

[0043] 4. When the detection coil 9 detects that the resistance value of the lightning protection grounding component 10 is greater than 10 ohms, the detection box 8 issues a second-level alarm, and the second-level alarm light 8.3 lights up blue.

[0044] 5. When the detection coil 9 detects that the resistance value of the lightning protection grounding member 10 is infinite, that is, the flat steel or round steel is disconnected from the earth grounding body, the detection box 8 issues a three-level alarm, the three-level alarm light 8.4 lights up blue and the buzzer 8.5 sounds.

[0045] (1) According to the explosion-proof requirements of the coal gasification area, a lightning protection grounding resistance system suitable for the explosion-proof level of the area is proposed and designed. The system includes three parts: flat steel (round steel) of the lightning protection grounding piece 10, the detection box 10, and the detection coil 9.

[0046] (2) Design a lightning protection grounding detection schematic diagram. Through a special clamp-shaped coil clamped on the flat steel (round steel), the grounding resistance value is obtained through the detection circuit, and internal measurement and comparison are performed to achieve early warning output based on different resistance values. At the same time, the detection device has internal battery power supply and external power charging functions. Different power supply methods can be selected according to different needs.

[0047] (3) Solder, install and test the circuit according to the circuit diagram. Except for the detection coil 9, the electrical components of the remaining circuits are designed with explosion-proof packaging and are packaged in a box of a certain specification to facilitate on-site installation.

[0048] (4) On-site installation and operation.

[0049] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the enlightenment of the present invention, and all those having the same or similar technical solutions as the present invention fall within the protection scope of the present invention.

[0050] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A coke oven coal gasification area lightning protection grounding system, characterized in that: It comprises a detection box and a detection coil. A control mainboard and a lithium battery are arranged in the detection box. The lithium battery is connected to and supplies power to the control mainboard. The control mainboard comprises a lithium battery charging circuit, a power selection circuit, a voltage stabilizing circuit, a reference voltage circuit, a detection comparison circuit, an early warning output circuit and a resistance test interface. The voltage stabilizing circuit is connected to the power selection circuit, the power selection circuit is connected to the lithium battery charging circuit, the lithium battery charging circuit is connected to the reference power circuit, the reference power circuit is connected to the detection comparison circuit, the detection comparison circuit is connected to the early warning output circuit and the resistance test interface, the resistance test interface is connected to the detection coil, the detection coil is arranged outside the shell of the detection box, the detection coil is installed outside the grounding piece, the detection coil detects the resistance value on the grounding piece and transmits it to the detection comparison circuit, the detection comparison circuit identifies the resistance value of the grounding piece and controls the early warning output circuit to make different levels of alarms.

2. The coke oven coal gasification area lightning protection grounding system according to claim 1 is characterized in that: The lithium battery charging circuit is provided with a charging interface and a charging battery management chip TP4056X. The charging battery management chip TP4056X is connected to the charging interface, and the charging battery management chip TP4056X provides a 5V voltage for the reference voltage circuit.

3. The coke oven coal gasification area lightning protection grounding system according to claim 2 is characterized in that: The power selection circuit is provided with a field effect tube IRF5210 and a battery interface, the battery interface is connected to a lithium battery, and the field effect tube IRF5210 selects an external 220V power supply or a lithium battery power supply.

4. The coke oven coal gasification area lightning protection grounding system according to claim 1, characterized in that: The voltage stabilizing circuit is provided with a synchronous boost DC-DC converter chip PW5100, and the synchronous boost DC-DC converter chip PW5100 stabilizes the power supply circuit and keeps the output voltage substantially unchanged when the input voltage fluctuates or the load changes.

5. The coke oven coal gasification area lightning protection grounding system according to claim 1, characterized in that: The reference power supply circuit comprises an operational amplifier LM324AD and a voltage reference IC chip LM4041CIM3-ADJ. The operational amplifier LM324AD and the voltage reference IC chip LM4041CIM3-ADJ control circuit are not affected by the power supply voltage to form a reference power supply.

6. The coke oven coal gasification area lightning protection grounding system according to claim 1, characterized in that: The detection comparison circuit is provided with two groups of operational amplifiers LM324AD, which form a comparator circuit. The two groups of operational amplifiers LM324AD judge the current resistance value of the grounding piece collected by the detection coil and the set resistance value. The resistance value set in the detection comparison circuit is 4 ohms and 10 ohms.

7. The coke oven coal gasification area lightning protection grounding system according to claim 1, characterized in that: The resistance test interface is provided with a wiring terminal, and the wiring terminal is connected to the detection coil.

8. The coke oven coal gasification area lightning protection grounding system according to claim 1, characterized in that: The early warning output circuit is connected with no alarm light, first-level alarm light, second-level alarm light, third-level alarm light and buzzer, the buzzer is installed on the detection box, no alarm light, first-level alarm light, second-level alarm light and third-level alarm light are installed on the front panel of the detection box, and the second-level alarm light and the third-level alarm light use the same alarm light.

9. The coke oven coal gasification area lightning protection grounding system according to claim 1, characterized in that: The detection coil is installed on the grounding piece through a clamp or an elastic clamp, and the grounding piece is round steel or flat steel.

10. The working method of the coke oven coal gasification area lightning protection grounding system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. The detection box is installed on the grounding piece through the fixed installation structure of the detection coil, and the detection coil collects the resistance value of the grounding piece; S2. When the detection coil detects that the resistance value of the lightning protection grounding component is less than or equal to 4 ohms, the detection box does not sound an alarm and no alarm light comes on; S3. When the detection coil detects that the resistance value of the lightning protection grounding piece is greater than 4 ohms and less than or equal to 10 ohms, the detection box will issue a first-level alarm and the first-level alarm light will be on; S4. When the detection coil detects that the resistance value of the lightning protection grounding piece is greater than 10 ohms, the detection box will issue a second-level alarm and the second-level alarm light will be on; S5. When the detection coil detects that the resistance value of the lightning protection grounding component is infinite, that is, the flat steel or round steel is disconnected from the earth grounding body, the detection box will issue a three-level alarm, the three-level alarm light will light up and the buzzer will sound.

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