WO2015085696A1

WO2015085696A1 - Control method and apparatus for sulfuric acid leakage monitoring

Info

Publication number: WO2015085696A1
Application number: PCT/CN2014/076072
Authority: WO
Inventors: 赵晨光; 魏丽; 幺琳; 雷振山
Original assignee: 唐山学院
Priority date: 2013-12-10
Filing date: 2014-04-23
Publication date: 2015-06-18
Also published as: CN104141883B; CN104141883A

Abstract

A control method and apparatus for sulfuric acid leakage monitoring. The method comprises: disposing a leaked acid receiving tape at a part requiring sulfuric acid monitoring, the structure of the leaked acid receiving tape being: copper laying a copper wire on a substrate made of a thermoplastic resin material and coating the copper wire by using a polyether-ether-ketone protecting layer; if a resistance value of the leaked acid receiving tape changes, reporting a sulfuric acid leakage alarm; and after a stable resistance value is obtained after the resistance value of the leaked acid receiving tape changes, obtaining a specific sulfuric acid leakage position according to a relationship among the obtained stable resistance value, the section area of the copper wire and the electrical resistivity of the copper wire before leakage, and sending a notification message. The method and the apparatus thereof solve the problem that micro-leakage of sulfuric acid cannot be monitored and the leakage position cannot be located at present.

Description

Control method and device for sulfuric acid leakage monitoring

The invention relates to the technical field of automatic monitoring, in particular to a control method and device for monitoring sulfuric acid leakage.

Background technique

Sulfuric acid is an important industrial raw material, and pipeline transportation is a common method of sulfuric acid transportation. In the event of a leak in the sulphuric acid pipeline, it not only causes waste of sulphuric acid, but also poses a great danger in the surrounding environment and even endangers personal safety. At present, most of the sulfuric acid pipelines are not equipped with automatic leak monitoring devices. Due to manual inspections, leaks cannot be detected in time, and it is easy to miss the leaks and waste labor. At present, some pipelines are monitored online by the negative pressure wave method, and the sulfuric acid leakage is monitored by the change of the pressure in the pipeline when the sulfuric acid leaks, but this method does not monitor the leakage of less than 1% of the flow, and it is difficult to accurately locate the leakage point. There are also a small number of pipelines that are monitored with a 3⁄4 acid leaking cable that can sense sulfuric acid dripping on its surface, but its monitoring distance is short (about 300m), the sensing surface is narrow (about 2mm), and the price is expensive. 3000 yuan / m), does not have a leak point positioning function.

Therefore, there is a need for a technical solution for automatic control of sulfuric acid leak monitoring to solve the above problems.

Summary of the invention

The technical problem to be solved by the present invention is to provide a control method and device for monitoring sulfuric acid leakage to solve the problem that there is currently no monitoring of small leakage of sulfuric acid and the inability to locate a leak point.

In order to solve the above problems, the present invention provides a control method for sulfuric acid leakage monitoring, comprising: providing a leakage acid receiving belt in a portion where sulfuric acid monitoring is required, wherein the structure of the leakage acid receiving belt is: laying copper on a thermoplastic resin material substrate Applying a polyetheretherketone protective layer to the copper wire;

It is judged that if the resistance value of the acid leakage receiving belt changes, the sulfuric acid leakage alarm is performed; after obtaining the stable resistance value after the leakage acid accepts the change, the obtained stable resistance value, the copper cross-sectional area and the undeveloped The relationship between the resistivity of the copper wire before the leak occurs, thereby obtaining a specific sulfuric acid leak position and transmitting a notification message.

The invention also provides a control device for sulfuric acid leakage monitoring, comprising:

The monitoring unit comprises a leakage acid receiving belt and a signal collector connected to each other, wherein the leakage acid receiving belt is disposed at a portion where sulfuric acid monitoring is required, wherein the structure of the leakage acid receiving belt is: laying on a thermoplastic resin material substrate Copper wire, copper wire coated with polyetheretherketone protective layer;

a signal collector for obtaining information on the resistance value of the acid leakage receiving strip; and

The centralized display alarm is configured to receive the sulfuric acid leakage alarm according to the information of the resistance value of the received leakage acid receiving band, and if the resistance value of the leakage acid receiving band changes, obtain the stable resistance value after the leakage acid accepts the change According to the relationship between the obtained stable resistance value, the cross-sectional area of the copper wire, and the resistivity of the copper wire before the leakage occurs, a specific sulfuric acid leak position is obtained and a notification message is transmitted.

Compared with the prior art, the invention can detect small leakage of sulfuric acid with a flow rate of 5 ml; each monitoring unit has a long length, and each monitoring unit communicates with a chain structure, which can extend the monitoring length indefinitely; With the monitoring unit, the copper wire return type laying structure increases the area of the leaked sulfuric acid sensing and improves the sensitivity; the way of tracking the resistance change process can be taken to improve the reliability of the monitoring; and the leakage is located by comparing the resistance changes. Point, which makes positioning more accurate leak point, positioning accuracy can reach <10111, and has higher reliability; communication uses SHDSL (symmetric high-speed digital subscriber line) mode, only one pair of twisted pairs can realize long-distance communication . Centralized display The alarm has sound and light alarm and SMS alarm function, which can notify the on-site and remote relevant personnel to take timely measures. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic flow chart of a control method for sulfuric acid leakage monitoring of the present invention;

2 is a schematic structural view of a control device for sulfuric acid leakage monitoring of the present invention; Figure 3 is a schematic view showing the specific structure of the control device of the present invention;

4 is a schematic diagram of the principle of the signal collector of the present invention;

Figure 5 is a schematic diagram showing the principle of the network extender group structure of the present invention;

Figure 6 is a schematic diagram showing the principle of the structure of the centralized display alarm of the present invention.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 1, the schematic diagram of the control method of the sulfuric acid leakage monitoring of the present invention includes the following steps:

Step 10: Providing a leakage acid receiving belt in a portion where sulfuric acid monitoring is required, wherein the structure of the leakage acid receiving belt is: laying a copper wire on the thermoplastic resin material substrate, wherein the copper wire is surrounded by a multi-cycle type and the copper wire There is a gap between them, and the polyetheretherketone protective layer is coated on the copper wire; the portion to be subjected to sulfuric acid monitoring may be a pipe for transporting sulfuric acid or a container for storing sulfuric acid, etc., and the present invention is not limited thereto.

The thermoplastic resin includes PE (polyethylene), PVC (polyvinyl chloride), PS (polystyrene), PA (polyamide), POM (polyfurfural), PC (polycarbonate), polyphenylene ether, poly Materials such as sulfone or rubber. The thermoplastic resin material which maintains the above characteristics regardless of the number of times of heating and cooling repeated can be used for the present invention as long as it has the properties of heat softening, cooling hardening, and chemical reaction, and the present invention is not limited thereto. The invention adopts a copper wire-back type laying structure (that is, a multi-cycle back-type surrounding structure), which increases the area perceived by the leaked sulfuric acid and improves the sensitivity. Polyetheretherketone is rigid and flexible, especially for fatigue resistance under alternating stress, and is comparable to alloy materials. Polyetheretherketone has high temperature and corrosion resistance and high chemical stability. However, polyetheretherketone is very sensitive to sulfuric acid and will be corroded by sulfuric acid. Strong acid and strong alkali other than sulfuric acid can not corrode. Ether ether ketone, therefore, the polyether ether ketone protective layer is coated on the copper wire in the present invention A very important technical feature ensures that when the concentrated sulfuric acid leaks, it immediately melts the acid leakage to accept the polyetheretherketone coating on the surface of the belt, causing the acid leakage to accept the change in the resistance value of the acid to reveal the leakage of concentrated sulfuric acid.

A plurality of the acid leakage receiving belts can be connected by a chain structure, and the monitoring length can be infinitely expanded in this way, for example, the leakage acid receiving belt is 1000 meters in length, and the 10 chain-connected acid leakage receiving belt can reach 10km, if 100 chain-connected acid leakage receiving belt can reach 100km, this can achieve the technical effect of extending the monitoring length.

Step 20: judging that if the resistance value of the leakage acid receiving belt changes, the acid leakage alarm is performed; after obtaining the stable resistance value after the leakage acid accepts the change, the obtained stable resistance value, the copper cross-sectional area, and The relationship between the copper resistivities before the leak did not occur, and the specific sulfuric acid leak position was obtained and a notification message was sent.

After obtaining the stable resistance value after the change of the leakage acid is received, the step of obtaining a specific sulfuric acid leakage position is obtained according to the relationship between the obtained stable resistance value, the cross-sectional area of the copper wire, and the resistivity of the copper wire before the leakage occurs. Includes:

Obtain the leakage acid acceptance band until the ring of each loop of the copper wire is short-circuited, and the resistance reaches a stable value R. The sulfuric acid and the copper wire form a series-parallel resistance loop, and the length of the copper wire is determined according to the relationship R= p 1/S. , thereby obtaining a specific sulfuric acid leakage position; wherein the resistivity p is the copper wire resistivity before the leakage occurs, and S is the copper wire cross-sectional area.

As shown in FIG. 2, a control device for acid leakage monitoring includes: a monitoring unit and a centralized display alarm, wherein

The centralized display alarm is configured to receive the sulfuric acid leakage alarm according to the information of the resistance value of the received leakage acid receiving band, and if the resistance value of the leakage acid receiving band changes, obtain the stable resistance value after the leakage acid accepts the change According to the relationship between the obtained stable resistance value, the cross-sectional area of the copper wire, and the resistivity of the copper wire before the leakage occurs, a specific sulfuric acid leak position is obtained and a notification message is transmitted. In the structure of the acid leakage receiving strip, the copper wire is a multi-cycle-shaped surrounding laying structure and there is a gap between the copper wires;

The signal collectors of each of the monitoring units are connected to each other by a network extender group of symmetric high-speed digital subscriber lines;

The leakage acid accepting bands of each of the monitoring units are connected by a chain structure.

After the concentrated display alarm obtains the stable resistance value after the change of the leakage acid acceptance band, the specific sulfuric acid leakage is obtained according to the relationship between the obtained stable resistance value, the cross-sectional area of the copper wire and the resistivity of the copper wire before the leakage occurs. Location means:

The concentrated display alarm obtains the leakage acid receiving band until the resistance of the copper wire around the return type is short-circuited, and the resistance reaches a stable value R. The sulfuric acid and the copper wire form a series-parallel resistance loop, according to the relationship R=PX 1/S The length of the copper wire is determined to obtain a specific sulfuric acid leakage position; wherein the resistivity p is the copper wire resistivity before the leakage occurs, and S is the copper wire cross-sectional area.

The signal collector is disposed on the printed circuit board, and includes: a constant current source output line connected to the leakage acid receiving strip at one end, and the other end of the constant current source output line is connected to the constant current source module and the voltage signal line, the voltage signal line Connected to the constant current source output line and the analog-to-digital conversion module, the analog-to-digital conversion module and the microprocessor are connected by a data bus, the microprocessor and the network module are connected by a data line, and the network module and the symmetric high-speed digital subscriber line outside the printed circuit board The network extender groups are connected by a network cable.

The centralized display alarm includes a control module, an alarm module, and a short message module, wherein the control module is configured to receive information of a resistance value of a leakage acid acceptance band, and perform calculation and determination.

^f acid leak location;

The alarm module is configured to perform a sulfuric acid leak alarm by sound and/or light;

The short message module is configured to send the sulfuric acid leakage alarm information and the information of the sulfuric acid leakage position by using a short message. The alarm module is connected to the control module through a serial communication port, and the short message module is connected to the control module through a USB communication port.

The specific way: Since the constant current I is applied to the leakage acid receiving band, the voltage value V across the copper wire is detected, and the copper wire resistance value 1 is measured according to Ohm's law R=V/I. In the absence of sulfuric acid leakage, the acid leakage receiving strip maintains a constant resistance value determined by the length of the copper wire, the cross-sectional area of the copper wire, and the resistivity of the copper wire. When the sulfuric acid leaks, it will immediately melt the acid to accept the polyetheretherketone coating on the surface of the belt. Due to the good conductivity of the sulfuric acid, the adjacent copper wire is short-circuited, causing the resistance value of the acid leakage receiving band to change, for example, within 1 second. Less than 1%, that is, a sulfuric acid leak may occur at this time, and a leak alarm can be performed. As the sulfuric acid leak increases, the shorted copper wire increases, and the resistance continues to decrease until the ring-shaped copper wire 4 ring is short-circuited, and the resistance is reached. A stable value. At this time, a series-parallel resistance loop is composed of sulfuric acid and copper wires. The resistance value of sulfuric acid is determined for a certain length. Therefore, according to the resistance calculation formula R= pl/S, R is detected by the data collector; the resistivity p釆 is calculated by the resistance value before the warning to eliminate the temperature change. Influence; S is the cross-sectional area of the copper wire, and the length of the copper wire can be determined to determine the position of the leak point. The invention can be used for monitoring the leakage of acid in pipelines.

DETAILED DESCRIPTION OF THE INVENTION As shown in Fig. 3, the control device for sulfuric acid leakage monitoring may include a leakage acid receiving belt, a signal collector, and a centralized display alarm. The acid leakage receiving belt has a length of 1000m. A copper wire with a cross-sectional area of 0.02 square millimeter is laid on a polyethylene plastic substrate with a thickness of 2 mm. The copper wire is rounded for 4 weeks, the line spacing is 5 mm, and the copper wire is coated with a thickness of 0.1 mm. Ether ether ketone protective layer. As shown in FIG. 4, the signal collector is on the printed circuit board, and the constant current source module is connected with a constant current source output line, and the voltage signal line is connected to the constant current source output line and the analog to digital conversion module, the analog to digital conversion module and the micro The processor is connected through a data bus, and the microprocessor and the network module are connected by a data line; the network module and the SHDSL (Symmetric high-speed digital subscriber line) network extender group outside the printed circuit board are connected by a network cable. . Figure 5 is a schematic diagram of the structure of the network extender group. In the chassis, the SHDSL network extenders are respectively connected by a network cable and a hub.

As shown in Fig. 6, the centralized display alarm includes a control module, an alarm module and a short message module, wherein the control module can use an industrial tablet computer, and the alarm module can use an audible and visual alarm.

The copper strip of the acid leakage receiving strip is connected to the constant current source of the signal collector, each of the acid accepting strips and one The signal collectors form a monitoring unit; the signal collectors of the respective monitoring units are connected by twisted pairs; the first signal collector is connected to the centralized display alarm by an Ethernet cable.

The control unit for the sulfuric acid leak monitoring is installed with the necessary auxiliary facilities to allow the leaking sulfuric acid to drip on the acid leakage receiving belt. For example, if the relative positions of the two are determined, it is possible to cause the leaked sulfuric acid to drip on the acid leakage receiving belt.

Since the current supplied by the signal collector to the leakage acid receiving strip is constant, the enthalpy trap acid accepts the voltage signal of the strip, and the resistance value of the leaky acid accepting strip can be detected according to Ohm's law. In the absence of sulfuric acid leakage, the acid leakage receiving strip maintains a constant resistance value determined by the length, cross-sectional area and electrical resistivity of the copper wire. When the sulfuric acid leaks, the polyether ether ketone coating on the surface of the strip is immediately melted. Due to the good conductivity of the sulfuric acid, the adjacent copper wire is short-circuited, causing the leakage acid to accept the change in the resistance value. At this point, the leak alarm can be performed; as the sulfuric acid leakage increases, all the adjacent lines of the return copper wire are short-circuited, and the resistance value reaches a stable value. According to this value and the sulfuric acid resistance value and the calculation formula of the copper wire resistance value, the positioning can be performed. Leak point.

Each monitoring unit packs the leakage monitoring information of the unit and the leakage monitoring information of the previous unit into the back, and all the information is sequentially transmitted to the centralized display alarm. When the leakage occurs, the alarm is activated to start the alarm module and notify the relevant personnel through the short message module. .

More specific: a copper wire with a cross-sectional area of 0.02 mm2 is laid on a 1000 m long, 2 mm thick polyethylene plastic substrate. The copper wire is backed around for 4 weeks, the line spacing is 5 mm, and the copper wire is coated with 0.1 mm thick polyether ether. The ketone protective layer is made into a leakage acid accepting tape. On the printed circuit board, the constant current source module of model CM3502 is connected with a constant current power supply output line, the voltage signal line is connected with the constant current source output line and the analog-to-digital conversion module of model AD7490, and the analog-to-digital conversion module and model number are AT91RM9200. The microprocessor is connected through a data bus, and the microprocessor and the 10M/100M adaptive network module of the model DM9161E are connected by a data line; the network module and the hub in the SHDSL network extender group outside the printed circuit board are connected by a network cable, and are made. Signal collector. Two SHDSL network extenders in the network extender group, model ACC3010, are connected to the hub of model FH08. The leakage acid accepts a constant current source with copper wires connected to the signal collector, each of the acid leakage receiving strips and one signal collector forms a monitoring unit; the network extenders of the respective signal collectors are connected by twisted pairs The network extender of the first signal collector is connected to the centralized display alarm by an Ethernet cable. The model in the centralized display alarm is The sound and light alarm of LW-EMS-10 is connected to the flat panel industrial computer of type TPC126-H through the serial communication port. The short message module of type HTGSM-1U is connected to the tablet industrial computer through the USB communication port. The number of monitoring units that make up the control device for sulfuric acid leak monitoring is determined by the length of the pipeline being monitored, with one monitoring unit per 1000 meters. When the control device for acid leakage monitoring is installed, the acid leakage receiving belt is installed under the sulfuric acid conveying pipe, and the necessary auxiliary facilities are used to cause the leaking sulfuric acid to drip on the acid leakage receiving belt.

When the control device for sulfuric acid leakage monitoring works, a constant current I is introduced into the copper strip of the acid leakage receiving line, and the voltage value V across the copper wire is detected in real time, so that the resistance value of the copper wire is measured according to Ohm's law R=V/I. . The value of R varies with the ambient temperature, but the change is slow. Once the value of R changes rapidly, for example, if it decreases by more than 1% in 1 second, acid leakage may occur. ^The polyetheretherketone coating which melts on the surface of the acid leakage receiving tape and melts immediately on the surface of the acid leakage. Due to the good conductivity of sulfuric acid, the adjacent copper wire is short-circuited to reduce the resistance value. At this point, the signal collector issues an early warning and saves the resistance value at the moment before the warning. As the amount of leakage acid increases, the number of short-circuited copper wires increases, and the resistance continues to decrease until the ring-shaped copper wire 4 is completely short-circuited, and the resistance reaches a stable value. At this time, a series-parallel resistance loop is composed of sulfuric acid and copper wires. The resistance value of sulfuric acid is determined for a certain length. Therefore, according to the resistance calculation formula R= pl/S, R is detected by the data collector; the resistivity p釆 is calculated by the resistance value before the warning to eliminate the temperature change. Influence; S is the cross-sectional area of the copper wire of 0.02 mm 2 , and the length of the copper wire can be determined to determine the position of the leak point.

When the control device of the sulfuric acid leakage monitoring works, each monitoring unit packs the leakage monitoring information of the unit and the leakage monitoring information of the previous unit into the back, and all the information is sequentially transmitted to the centralized display alarm, and the alarm is started when the leakage warning occurs. The sound and light alarm informs the relevant personnel through the short message module to make necessary inspections; after determining the location of the leak point, the alarm is displayed in a centralized manner to display the leak point position, so that the operator can quickly arrive at the scene for processing.

Sulfuric acid is highly corrosive. If the leak is not controlled in time, the consequences are unimaginable, so it is important to quickly determine the location of the sulfuric acid leak. In the structure of the leakage acid-receiving belt of the present invention, a plurality of glass filaments are embedded in the return structure of the copper wire of the laying structure surrounded by the multi-cycle type, and the glass filament is a mesh structure, and the width of the mesh structure is less than or equal to The distance between the copper wires, preferably the diameter of the glass filament is less than 1 mm, the spacing between the copper wires is 5 mm, and the width of the mesh structure is 4 mm. Through the above structure, the leakage of acid can quickly bring the resistance of the copper wire of the surrounding structure to a stable value. . Actual measurement of the invention Trial application to the 35km acid transport pipeline, the diameter of the glass filament is 0.04mm, the copper wire spacing is 5mm, and the width of the mesh structure is 4mm, an acid leakage point is set, and the position of the leaked sulfuric acid is determined by 21 seconds. It can speed up the process of treating sulfuric acid leakage and reduce the loss caused by leaking sulfuric acid.

The various embodiments in the present specification are generally described in a progressive manner, and each embodiment is focused on differences from the other embodiments, and the same or similar parts of the various embodiments can be referred to each other.

In general, a program module or unit may be implemented by software, hardware, or a combination of both. The present application may be practiced in a distributed computing environment in which a connection is made through a communication network. Remoting the device to perform tasks. In a distributed computing environment, a program module or unit can be located in both local and remote computer storage media including storage devices.

Finally, it should also be noted that in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities. There is any such actual relationship or order between operations. Furthermore, the terms "comprising", "comprising" or "comprising" or "comprising" or "the" Other elements, or elements that are inherent to such a process, method, commodity, or equipment. An element defined by the phrase "comprising a" does not exclude the presence of another element in the process, method, item, or device that comprises the element, without further limitation.

The principles and embodiments of the present application are described herein with reference to specific examples. The description of the above embodiments is only for the purpose of helping to understand the method and the main idea of the present application. Meanwhile, for those skilled in the art, according to the present application. The present invention is not limited to the scope of the present application.

Claims

claims

1. A control method for acid leakage monitoring, characterized by including:

An acid leakage receiving belt is installed in the part that needs to be monitored for sulfuric acid. The structure of the acid leakage receiving belt is as follows: copper wires are laid on the thermoplastic resin material base, and the copper wires are coated with a polyetheretherketone protective layer;

It is judged that if the resistance value of the acid leakage receiving belt changes, a sulfuric acid leakage alarm will be issued; after obtaining the stable resistance value of the acid leakage receiving belt after the change, according to the obtained stable resistance value, the copper wire cross-sectional area and the copper wire resistance before leakage, The relationship between the leakage rates can be used to obtain the specific location of sulfuric acid leakage and send notification information.

2. The control method according to claim 1, characterized in that,

In the structure of the acid leakage receiving tape, the copper wires adopt a multi-circular surrounding laying structure and there are gaps between the copper wires.

3. The control method according to claim 1, characterized in that,

The step of arranging a leakage acid receiving belt in the part where sulfuric acid monitoring is required also includes a plurality of the acid leakage receiving belts being connected by a chain structure.

4. The control method according to claim 1, characterized in that,

After obtaining the stable resistance value after the acid leakage acceptance zone changes, the step of obtaining the specific sulfuric acid leakage location is based on the relationship between the obtained stable resistance value, the cross-sectional area of the copper wire and the resistivity of the copper wire before leakage occurs. include:

Obtain the stable value of the resistance of the acid leakage acceptance zone until all the loops of the copper wire surrounding the loop are short-circuited.

R, sulfuric acid and copper wire form a series-parallel resistance loop. According to the relationship R= p S is the cross-sectional area of the copper wire.

5. The control method according to claim 1, characterized in that,

The thermoplastic resin includes polyethylene, polyvinyl chloride, polystyrene, polyamide, polyformaldehyde, polycarbonate, polyphenylene ether, polysulfone or rubber.

6. A control device for acid leakage monitoring, characterized in that it includes: The monitoring unit includes an acid leakage receiving belt and a signal collector that are connected to each other. The acid leakage receiving belt is arranged in the part where sulfuric acid monitoring is required. The structure of the acid leakage receiving belt is: laid on a thermoplastic resin material base. Copper wire, the copper wire is coated with a polyetheretherketone protective layer;

A signal collector for obtaining information on the resistance value of the leakage acid receiving strip; and

Centralized display alarm, used to determine if the resistance value of the acid leakage acceptance zone changes based on the received information on the resistance value of the acid leakage acceptance zone, and then send a sulfuric acid leak alarm; after obtaining the stable resistance value of the acid leakage acceptance zone after the change , based on the obtained relationship between the stable resistance value, the cross-sectional area of the copper wire and the resistivity of the copper wire before leakage, the specific sulfuric acid leakage location is obtained and notification information is sent.

7. The control device according to claim 6, characterized in that,

In the structure of the acid leakage receiving tape, the copper wires are laid in a multi-circle type surrounding structure and there are gaps between the copper wires;

The signal collectors of each monitoring unit are connected to each other through a network extender group of symmetrical high-speed digital subscriber lines;

The acid leakage receiving zones of each monitoring unit are connected through a chain structure.

8. The control device according to claim 6, characterized in that,

After the centralized display alarm obtains the stable resistance value after the change of the acid leakage acceptance zone, the specific sulfuric acid leakage is then obtained based on the relationship between the obtained stable resistance value, the cross-sectional area of the copper wire and the resistivity of the copper wire before leakage. Location refers to:

The centralized display alarm obtains the acid leakage acceptance zone until the resistance reaches a stable value R after all the loops of the copper wires surrounding the loop are short-circuited. The sulfuric acid and copper wires form a series-parallel resistance loop, according to the relationship R = p X 1/ S obtains the copper wire length 1 to obtain the specific sulfuric acid leakage location; where the resistivity p is the resistivity of the copper wire before leakage occurs, and S is the cross-sectional area of the copper wire.

9. The control device according to claim 7, characterized in that,

The signal collector is set on a printed circuit board and includes: a constant current source output line connected to the leakage acid receiving tape at one end, and the other end of the constant current source output line connected to the constant current source module and the voltage signal line. The voltage signal line It is connected to the constant current source output line and the analog-to-digital conversion module. The analog-to-digital conversion module and the microprocessor are connected through the data bus. The microprocessor and the network module are connected through the data line. The network module is connected to the printed circuit. The network extender groups of symmetrical high-speed digital subscriber lines outside the board are connected through network cables.

10. The control device according to claim 6, wherein the centralized display alarm includes a control module, an alarm module and a text message module, wherein the control module is used to receive the resistance value of the acid leakage receiving belt. information to calculate and determine the location of acid leakage; the alarm module is used to alarm sulfuric acid leakage through sound and/or light;

The SMS module is used to send sulfuric acid leakage alarm information and sulfuric acid leakage location information through SMS.