Hotspot detection early warning system for circular closed coal yard

Abstract

The utility model discloses a hot spot detection early warning system for a circular closed coal yard, which comprises an upper computer, a fire alarm system, a plurality of temperature collectors and a plurality of thermocouple type temperature measurement cables, and is characterized in that each temperature collector is respectively connected with the upper computer, the fire alarm system and the thermocouple type temperature measurement cables; the plurality of thermocouple type temperature measuring cables are circumferentially arranged on the inner wall of a coal retaining wall of the circular closed coal yard at intervals, one end of each thermocouple type temperature measuring cable is vertically arranged along the inner wall of the coal retaining wall, and the other end of each thermocouple type temperature measuring cable is transversely laid along the bottom of the inner wall of the coal retaining wall. According to the utility model, the thermocouple type temperature measuring cable is used for continuously monitoring the temperature change of the coal pile at the periphery of the circular closed coal yard, so that the comprehensiveness and accuracy of temperature monitoring are ensured, the installation process is simplified, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coal yard safety, and in particular to a hot spot detection and early warning system for a circular closed coal yard. Background Art

[0002] There are dead corners of coal in the inner area of ​​the closed coal yard. The coal in the dead corners is very likely to spontaneously combust after being stored for a long time. The high temperature generated by spontaneous combustion directly acts on the inner wall of the coal yard, causing the inner wall strength to decrease, posing a safety hazard. Therefore, a hot spot detection and early warning system needs to be installed on the inner wall of the coal retaining wall to detect abnormal temperature changes of the surrounding coal storage and determine the location of the hot spot.

[0003] The Chinese utility model patent with patent publication number CN204439246U discloses a safety monitoring system for a closed coal yard. Temperature measuring cables are arranged circumferentially in the closed coal yard, and a number of temperature sensors are provided on each temperature measuring cable to detect the temperature of the coal pile on the periphery of the closed coal yard. An infrared imager is provided on the top of the closed coal yard to scan the coal pile in the middle of the closed coal yard in all directions and detect the temperature of the coal pile in the middle, so as to realize comprehensive monitoring of the coal temperature in the entire closed coal yard and improve the safety of coal storage.

[0004] However, the above-mentioned safety monitoring system monitors the temperature of the coal pile on the periphery of the closed coal yard. Since many temperature sensors need to be installed on each temperature measuring cable to effectively monitor the temperature changes of the coal storage on the periphery of the entire circular material yard, it is not only complicated to install but also has high production costs. Utility Model Content

[0005] In order to overcome the problems of complex installation and high production cost in the prior art method of monitoring the temperature of the peripheral coal pile in a closed coal yard, the utility model provides a hot spot detection and early warning system for a circular closed coal yard.

[0006] The technical solution of the utility model is as follows:

[0007] A hot spot detection and early warning system for a circular closed coal yard comprises: a host computer, a fire alarm system, a plurality of temperature collectors and a plurality of thermocouple temperature measuring cables, each of the temperature collectors is respectively connected to the host computer, the fire alarm system and the plurality of thermocouple temperature measuring cables, the plurality of thermocouple temperature measuring cables are circumferentially spaced on the inner wall of a coal retaining wall of a circular closed coal yard, and one end of each of the thermocouple temperature measuring cables is placed vertically along the inner wall of the coal retaining wall, and the other end is laid horizontally along the bottom of the inner wall of the coal retaining wall.

[0008] As a preferred solution of the utility model, the circular closed coal yard is evenly distributed with twelve monitoring areas every 30°, each monitoring area is provided with a thermocouple temperature measuring cable, and every three adjacent thermocouple temperature measuring cables are connected to one temperature collector.

[0009] As a preferred solution of the utility model, the signal output end of each of the thermocouple temperature measuring cables is connected to the signal input end of a corresponding one of the temperature collectors through a compensation wire.

[0010] As a preferred solution of the utility model, the signal output end of each of the thermocouple temperature measuring cables is connected to the corresponding compensation wire through an explosion-proof junction box.

[0011] As a preferred solution of the utility model, the explosion-proof junction box is installed on a guardrail or a special column of a coal bunker inspection layer of the circular closed coal yard.

[0012] As a preferred solution of the utility model, each of the temperature collectors is provided with an explosion-proof casing.

[0013] As a preferred solution of the present utility model, each of the temperature collectors is provided with a display screen.

[0014] As a preferred solution of the utility model, each of the temperature collectors is installed on the guardrail or special column of the coal bunker inspection layer of the circular closed coal yard through a fixed bracket.

[0015] As a preferred solution of the present utility model, each of the temperature collectors is provided with a first RS485 transceiver, and the host computer is provided with a second RS485 transceiver, and the second RS485 transceiver is connected and communicated with the first RS485 transceiver.

[0016] As a preferred solution of the utility model, each of the temperature collectors is also connected to a plurality of infrared imagers, and the plurality of infrared imagers are arranged on the top of the circular closed coal yard.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. By setting thermocouple temperature measuring cables at circumferential intervals on the inner wall of the coal retaining wall, and laying one end of the thermocouple temperature measuring cables along the inner wall of the coal retaining wall, the temperature changes of the coal piles outside the circular closed coal yard can be continuously monitored, especially the key monitoring area at the bottom of the coal retaining wall, ensuring the comprehensiveness and accuracy of temperature monitoring;

[0019] 2. Compared with the traditional solution that requires a large number of temperature sensors, the use of thermocouple temperature measurement cables reduces the number of sensors, simplifies the installation process, and also reduces production costs;

[0020] 3. By setting up a temperature collector, the continuous thermocouple signal output by the thermocouple temperature measuring cable can be collected in real time, and according to the preset alarm temperature threshold, it can be determined whether to output a dry contact alarm signal to the fire alarm system; when the temperature reaches or exceeds the threshold, the system can quickly issue an early warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a system framework diagram of an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the partition arrangement of thermocouple type temperature measuring cables in one embodiment of the utility model;

[0024] Figure 3 This is a system framework diagram of another embodiment of the utility model.

[0025] In the figure,

[0026] 1. Host computer; 2. Fire alarm system; 3. Temperature collector; 4. Thermocouple temperature measuring cable; 5. Inner wall of coal retaining wall; 6. Infrared imager. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, it is stated that the embodiments described below are only used to explain the utility model and are not used to limit the utility model.

[0028] It should be noted that the terms "install", "set", "connect", "fix" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. The indicated orientation or position relationship is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the application product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, or the orientation or position relationship in which the application product is usually placed when in use, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are only used for the purpose of convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly defined. "Several" means one or more, unless otherwise clearly defined.

[0029] See also Figure 1 , this embodiment provides a hot spot detection and early warning system for a circular closed coal yard, including: a host computer 1, a fire alarm system 2, a plurality of temperature collectors 3 and a plurality of thermocouple temperature measuring cables 4, each temperature collector 3 is respectively connected to the host computer 1, the fire alarm system 2 and the plurality of thermocouple temperature measuring cables 4. Among them, the host computer 1 and the fire alarm system 2 are installed in the control room, and the plurality of temperature collectors 3 and the plurality of thermocouple temperature measuring cables 4 are installed in the circular closed coal yard. Specifically, the plurality of thermocouple temperature measuring cables 4 are circumferentially spaced on the inner wall 5 of the coal retaining wall of the circular closed coal yard, and one end of each thermocouple temperature measuring cable 4 is placed vertically along the inner wall 5 of the coal retaining wall, and the other end is laid horizontally along the bottom of the inner wall 5 of the coal retaining wall, that is, each thermocouple temperature measuring cable 4 is arranged in an L shape on the inner wall 5 of the coal retaining wall. Since the coal in the circular closed coal yard is piled at the bottom of the coal retaining wall, the temperature here is the highest and fire is prone to occur. It is a key monitoring area. Therefore, one end of each thermocouple temperature measuring cable 4 is laid horizontally along the bottom of the inner wall 5 of the coal retaining wall to focus on monitoring the temperature of this area. When working, the temperature collector 3 collects the continuous thermocouple signal (i.e., temperature data) output by the connected thermocouple temperature measuring cable 4 in real time, and determines whether to output a dry contact alarm signal to the fire alarm system 2 according to the preset alarm temperature threshold, and transmits the temperature data to the host computer 1 in real time, so that the host computer 1 can monitor and access it remotely. When the temperature collector 3 detects that the collected temperature value reaches the alarm temperature threshold, it outputs a dry contact alarm signal to the fire alarm system 2, thereby realizing the early warning function.

[0030] It should be noted that the thermocouple type temperature measuring cable 4 used in the utility model is also called a "continuous" thermocouple or a "heat-seeking" thermocouple, which can continuously generate a millivolt signal corresponding to the highest temperature within the range of its length and can be cut according to the actual application needs. The thermocouple type temperature measuring cable 4 uses the principle of thermoelectric effect to continuously generate a millivolt signal corresponding to the highest temperature within the range of its length. The thermoelectric effect was discovered by German scientist Seebeck in 1821. Conductors A and B of two different materials are welded end to end to form a closed loop. When there is a temperature difference between the two welding points of conductors A and B, a thermoelectric potential is generated between the two. This phenomenon is called the thermoelectric effect. The size of the thermoelectric potential is only related to the temperature of the junctions at both ends of the conductor. Ordinary point thermocouples work on this principle. The difference between the thermocouple type temperature measuring cable 4 and ordinary thermocouples is that its hot junction is not fixed, but always corresponds to the highest temperature point on the detector.

[0031] When the temperature of any point (T1) on the thermocouple temperature measuring cable 4 is higher than the temperature of other parts, the insulation resistance (R) between the thermocouple wires at that location decreases, resulting in a "temporary" hot junction, which has the same function as the hot junction of an ordinary point thermocouple. When the temperature of another point (T2) on the cable is higher than point T1, the insulation resistance between the thermocouple wires at that location will be lower than the resistance of point T1, resulting in a new "temporary" hot junction. Similarly, its signal always corresponds to the highest temperature along the line. The thermocouple temperature measuring cable 4 always outputs a temperature signal corresponding to the highest temperature in the laid area. It has superior temperature measurement performance, can effectively sense subtle changes in temperature along the temperature measuring cable, and has excellent ability to capture hot spots.

[0032] The hotspot detection and early warning system of the circular closed coal yard is capable of continuously monitoring the temperature changes of the coal piles outside the circular closed coal yard, especially the key monitoring area at the bottom of the coal retaining wall, by arranging thermocouple temperature measuring cables 4 which are circumferentially spaced on the inner wall 5 of the coal retaining wall, and one end of the thermocouple temperature measuring cables 4 is laid along the inner wall 5 of the coal retaining wall, thereby ensuring the comprehensiveness and accuracy of temperature monitoring. Compared with the traditional solution which requires a large number of temperature sensors, the use of thermocouple temperature measuring cables 4 reduces the number of sensors, simplifies the installation process, and also reduces the production cost. By setting a temperature collector 3, the continuous thermocouple signal output by the thermocouple temperature measuring cable 4 can be collected in real time, and it can be determined whether to output a dry contact alarm signal to the fire alarm system 2 according to the preset alarm temperature threshold. When the temperature reaches or exceeds the threshold, the system can quickly issue an early warning.

[0033] See also Figure 2In one embodiment, twelve monitoring areas are evenly distributed every 30° in a circular closed coal yard, each monitoring area is provided with a thermocouple temperature measuring cable 4, and every three adjacent thermocouple temperature measuring cables 4 are connected to a temperature collector 3, that is, a circular closed coal yard is equipped with twelve thermocouple temperature measuring cables 4 and four temperature collectors 3. By adopting the above method, the thermocouple temperature measuring cables 4 are laid in different areas, which can accurately locate the hot spots in the coal yard and quickly find the hidden dangers.

[0034] In one embodiment, the signal output end of each thermocouple temperature measuring cable 4 is connected to the signal input end of a corresponding temperature collector 3 through a compensation wire. The compensation wire is used to transmit the signal output by the connected thermocouple temperature measuring cable 4 to the corresponding temperature collector 3. Since there is a certain distance between the thermocouple temperature measuring cable 4 and the temperature collector 3, the use of the compensation wire to connect the thermocouple temperature measuring cable 4 and the temperature collector 3 can save the use of the thermocouple temperature measuring cable 4, thereby reducing the production cost.

[0035] In one embodiment, the signal output end of each thermocouple temperature measuring cable 4 is connected to the corresponding compensation wire through an explosion-proof junction box. In an inflammable and explosive environment, the explosion-proof junction box can prevent explosion accidents caused by electrical sparks or high temperature, thereby making the connection between the thermocouple temperature measuring cable 4 and the compensation wire more stable and reliable. Specifically, the explosion-proof junction box is installed on the guardrail or special column of the coal bunker maintenance layer of the circular closed coal yard. The environment of the circular closed coal yard usually involves coal dust and possible gas accumulation, which are inflammable and explosive factors. Installing the explosion-proof junction box on the guardrail or special column of the coal bunker maintenance layer can ensure that the junction box is away from potential coal dust accumulation areas, and can make it easier for staff to approach and operate these devices. When the junction box needs to be maintained or replaced, the staff can easily reach these locations, reducing the difficulty and time of maintenance work.

[0036] In one embodiment, each temperature collector 3 is installed on the guardrail or special column of the coal bunker inspection layer of the circular closed coal yard through a fixed bracket, which ensures the stability of the temperature collector 3, ensures that the temperature collector 3 can work continuously and stably, and is convenient for staff to inspect, maintain and replace it, reduces the difficulty and cost of maintenance, and improves work efficiency.

[0037] In one embodiment, each temperature collector 3 is provided with a display screen. By equipping each temperature collector 3 with a display screen, the staff can directly view the highest temperature monitored by each thermocouple temperature measuring cable 4 on site in real time through the display screen, so that the staff can instantly understand the temperature conditions of each area in the circular closed coal yard.

[0038] In one embodiment, each temperature collector 3 is provided with a first RS485 transceiver, and the host computer 1 is provided with a second RS485 transceiver, and the second RS485 transceiver is connected and communicated with the first RS485 transceiver to realize data transmission between the temperature collector 3 and the host computer 1. By using the RS485 transceiver to establish a communication connection between the temperature collector 3 and the host computer 1, not only the reliability of the system and the quality of data transmission are improved, but also the flexibility and maintainability of the system are increased, so that the system can more effectively monitor the temperature of the coal yard, and timely discover and respond to abnormal situations, thereby ensuring the safety and stable operation of the coal yard.

[0039] See also Figure 3 In one embodiment, each temperature collector 3 is also connected to a plurality of infrared imagers 6, which are arranged on the top of the circular closed coal yard to scan the coal pile in the middle of the circular closed coal yard in all directions and detect the temperature of the coal pile in the middle. The infrared imagers 6 cooperate with the thermocouple temperature measuring cables 4 to realize comprehensive monitoring of the coal temperature in the entire circular closed coal yard, so as to avoid spontaneous combustion and explosion caused by excessively high coal temperature, thereby improving the safety of coal storage.

[0040] It should be noted that, since the host computer 1 and the fire alarm system 2 are technologies well known to those skilled in the art, the present invention will not describe their specific structures and working principles in detail.

[0041] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

[0042] The above is an exemplary description of the utility model patent in conjunction with the accompanying drawings. It is obvious that the implementation of the utility model patent is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the utility model patent, or the concept and technical solution of the utility model patent are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A hot spot detection and early warning system for a circular closed coal yard, characterized in that: include: A host computer, a fire alarm system, a plurality of temperature collectors and a plurality of thermocouple temperature measuring cables, each of the temperature collectors is respectively connected to the host computer, the fire alarm system and the plurality of thermocouple temperature measuring cables, the plurality of thermocouple temperature measuring cables are circumferentially spaced on the inner wall of the coal retaining wall of the circular closed coal yard, and one end of each of the thermocouple temperature measuring cables is placed vertically along the inner wall of the coal retaining wall, and the other end is laid horizontally along the bottom of the inner wall of the coal retaining wall.

2. The hot spot detection and early warning system for a circular closed coal yard according to claim 1 is characterized in that: The circular closed coal yard is evenly distributed with twelve monitoring areas every 30°, each monitoring area is provided with a thermocouple temperature measuring cable, and every three adjacent thermocouple temperature measuring cables are connected to one temperature collector.

3. The hot spot detection and early warning system for a circular closed coal yard according to claim 1 is characterized in that: The signal output end of each of the thermocouple temperature measuring cables is connected to the signal input end of a corresponding temperature collector through a compensation wire.

4. The hot spot detection and early warning system for a circular closed coal yard according to claim 3 is characterized in that: The signal output end of each of the thermocouple temperature measuring cables is connected to the corresponding compensation wire through an explosion-proof junction box.

5. The hot spot detection and early warning system for a circular closed coal yard according to claim 4 is characterized in that: The explosion-proof junction box is installed on the guardrail or special column of the coal bunker maintenance layer of the circular closed coal yard.

6. The hot spot detection and early warning system for a circular closed coal yard according to claim 1 is characterized in that: Each of the temperature collectors is provided with an explosion-proof casing.

7. The hot spot detection and early warning system for a circular closed coal yard according to claim 1 is characterized in that: Each of the temperature collectors is provided with a display screen.

8. The hot spot detection and early warning system for a circular closed coal yard according to claim 1 is characterized in that: Each of the temperature collectors is installed on the guardrail or special column of the coal bunker inspection layer of the circular closed coal yard through a fixed bracket.

9. The hot spot detection and early warning system for a circular closed coal yard according to claim 1 is characterized in that: Each of the temperature collectors is provided with a first RS485 transceiver, and the host computer is provided with a second RS485 transceiver, and the second RS485 transceiver is connected and communicated with the first RS485 transceiver.

10. The hot spot detection and early warning system for a circular closed coal yard according to claim 1, characterized in that: Each of the temperature collectors is also connected to a plurality of infrared imagers, and the plurality of infrared imagers are arranged on the top of the circular closed coal yard.

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