Discussion on urban fire automatic alarm monitorin

2022-09-21
  • Detail

Talking about the urban automatic fire alarm monitoring and management system

I. Introduction

1.1 the application status of the automatic fire alarm system

the automatic fire alarm system is an automatic fire-fighting facility that takes all kinds of buildings or places monitored as the warning object and realizes early fire detection, automatic fire alarm and interlocking and linkage control of fire-fighting equipment through automatic means. When the fire detector detects the smoke, high temperature, flame and fire specific gas signals generated by the fire and converts them into electrical signals, the fire alarm signal is given through the analysis and comparison with the normal state value or parameter model, and is displayed through the audible and visual alarm on the fire alarm controller. At the same time, start the alarm device through the fire alarm controller to warn the on-site personnel to put out the fire or evacuate from the fire scene; Start the power-off control device, smoke control equipment, fire door, fire shutter, fire elevator, fire emergency lighting, fire control and other disaster reduction devices to prevent the spread of fire, control the fire and seek the support of the fire department; Start the fire hydrant, water spray, water curtain and gas fire extinguishing system devices to put out the fire in time and reduce fire losses

at present, the automatic fire alarm systems applied in China are basically regional automatic fire alarm systems, centralized automatic fire alarm systems and automatic fire alarm systems in control centers. Its installation mode is mainly distributed control mode. This kind of system is generally self-contained and self closed, which cannot realize the sharing of resources and services between systems. In case of fire, it cannot automatically report to the city "119" fire alarm Acceptance Center, and cannot reflect the specific fire location, fire intensity and other on-site conditions. However, these alarm systems are on-site alarms, that is, when there is smoke or high temperature on the site, they will immediately send audible, optical and electrical alarm signals

many developed countries (such as Germany) and regions (such as Hong Kong) have established automatic urban fire alarm networks. The control center of automatic fire alarm system of key protection units (such as hospitals, kindergartens, nursing homes) is directly connected with the fire command center, which is responsible for managing the network and handling alarm calls. The application research of this technology in mainland China started in the mid-1990s, but has developed rapidly in recent years. At present, some units have been committed to the research and development of automatic fire alarm monitoring technology and related products suitable for the characteristics of China's fire field, such as the urban fire monitoring system of Qinhuangdao Bay Safety Technology Co., Ltd., the urban fire alarm remote network management system of Shanghai Zhongtai fire monitoring equipment cooperation company, and the remote automatic fire alarm network management and monitoring system of Beijing Lida Anxin Digital Technology Co., Ltd. in Shanghai, Beijing Nanjing, Dalian and other cities have carried out the system test run to varying degrees and achieved certain results

1.2 development trend of automatic fire alarm system

with the progress of computer network technology, sensor technology and communication technology, the application of automatic fire alarm system in China has also begun to develop towards networking. The establishment of urban automatic fire alarm monitoring and management system has become the development trend of automatic fire alarm system. With the construction of information superhighway in China, using mplsvpn and other technologies through IP broadband metropolitan area can easily realize the proprietary fire protection network; The implementation of building automation and the development of smoke sensor, photoacoustic sensor, temperature sensor and wireless fire alarm system provide technical support for the automatic alarm and remote monitoring of urban fire protection system

especially due to the current development of intelligent building technology, the sharing and linkage of security and fire monitoring equipment is technically possible, and the integrated application of the two in installation, management, monitoring and other aspects has become their common development trend. In this way, it will be more conducive to the full implementation of safety prevention technology in social units

II. System overview

2.1 system introduction

urban automatic fire alarm monitoring and management system is an important means to improve urban modern management level and rapid response ability of fire alarm based on the automatic fire alarm system. It adopts the latest GSM network technology, GIS geographic information technology, SMS technology, broadband network technology and automatic control technology. It is a high-tech product combining computer technology and modern network communication technology. It integrates the functions of fire alarm controller operation monitoring, fire GIS geographic information, equipment maintenance, data record management, external network release and event processing, and carries out remote monitoring and scientific management of automatic fire alarm. The system can quickly and timely provide the confirmed fire information, details of the affected units, and video images to the fire command center, so that corresponding measures can be taken to carry out targeted fire fighting and rescue work, so that the reliability and accuracy of the alarm can be technically supported, and lay a foundation for the informatization and networking of urban fire management

2.2 system composition

the urban fire automatic alarm monitoring and management system is composed of two parts: hardware and software. The hardware includes automatic fire alarm monitoring center station, automatic fire alarm intelligent transceiver terminal, regional alarm device, alarm probe, networks at all levels, workstations at all levels, etc. The software includes signal receiving subsystem, query and monitoring subsystem, fire signal analysis and processing system, electronic map subsystem, video image system, signal real-time storage database, fire information database and database maintenance system

the automatic fire alarm intelligent transceiver terminal can be directly installed in the existing fire alarm system of buildings or places, which can monitor the alarm signals collected by the probe in real time, and use the GSM wireless communication system platform or public exchange to establish an information path to transmit the coded alarm information to the computer system of the monitoring center

the monitoring center controls 1 ~ more units through the alarm receiver, is responsible for communicating with each alarm transmitter, and inputs the received alarm information into the computer control system of the alarm receiving center. Through computer analysis, we can get the information of the unit where the alarm occurred and the fire alarm level, and immediately obtain the detailed situation report of this unit through electronic map, fire information database and video image system, Provide to 119 fire command center

III. working principle of the system

3.1 data collection of automatic fire alarm intelligent transceiver terminal

automatic fire alarm intelligent transceiver terminal is placed in various buildings to monitor and collect the alarm information and operation status of the automatic fire alarm system, preprocess the monitored and collected data and alarm information, and filter out false alarm and other information, Important alarm and operation status information that should have good grounding devices, such as time, place, equipment type and linkage information, will be automatically transmitted to the automatic fire alarm monitoring center through GSM network or public exchange. At the same time, the intelligent terminal activates the ADSL dialer to connect the video image transmission controller to the Internet

data acquisition methods mainly include analog quantity monitoring and serial data communication. At present, the automatic fire alarm system in use is generally equipped with output contacts for indicating the operation status of equipment or controlling automatic fire-fighting equipment

intelligent terminals use these passive or active output contacts to monitor the operation and alarm status of automatic fire alarm equipment by detecting current, voltage or on-off. Analog quantity monitoring method is widely used because of its simplicity, effectiveness and easy implementation. However, in this way, we can only understand the simple working status of the fire detection and alarm system equipment (such as operation, fault, alarm, etc.), which can not meet the current fire safety supervision needs of the fire department

data acquisition through serial data communication (RS-232, RS-422, RS-485, etc.) can make up for the shortcomings of analog quantity monitoring. Using the external serial data communication interface of the automatic fire alarm system, the intelligent terminal can realize data interconnection with it. By analyzing the data communication protocol of the fire detection and alarm equipment, the detailed and accurate alarm position, alarm type, system operation status, fault information, work record and other information of the monitored equipment can be obtained from the output data. These information is to distinguish the authenticity of fire alarm, understand the location of alarm points, and master the specific operation of equipment 4 Soft and tough: large elongation at break brings great convenience, which provides a reliable technical guarantee in shortening the alarm time and accurately and quickly extinguishing the fire. However, due to the large number of manufacturers and various models of fire detection and alarm system equipment, there is no unified standard specification for its external data communication protocol, and the complexity of the communication protocol brings great inconvenience to the monitoring terminal in the application of serial communication for data acquisition. Therefore, improving the compatibility of intelligent terminal with the output data communication protocol of many types of fire detection and alarm system equipment needs further research and solution

3.2 automatic fire alarm monitoring center

automatic fire alarm monitoring center is a local area (as shown in Figure 2), including data communication front-end computer, GIS processing workstation, user database workstation, web workstation and several data processing workstations. The fire data center can automatically receive the alarm and operation status and other information sent by the user's intelligent terminal through GSM network or public exchange, and comprehensively process its information

if it is a fire alarm, enter the fire processing process, including processing users' geographical location information, alarm confirmation, alarm level, major alarm processing process and notifying relevant persons, 119 fire command center, etc; If it is in operation status, enter the operation processing process, including fault confirmation and fault location, and further notify the relevant person to deal with the fault within a time limit. In these two processes, events will be recorded and a processing database will be formed, and daily, weekly, monthly, quarterly and annual reports will be automatically carried out for regular inspection and analysis; At the same time, establish operation files for users, and relevant information can be released to all fire supervision institutions through Internet authorization

the automatic fire alarm monitoring center system is composed of fire alarm terminal identification, communication processing, GIS geographic information processing, paging system, fire data processing system, video image system and other subsystems. The front-end computer, database server, pager management center and GIS workstation of the center are also the first kind of local interconnection of 3D printing medical materials developed in Korea. It can be composed of multiple computers, servers and workstations, or a workstation and a computing unit can complete the system. In order to ensure the reliability and safety of the system, heating backup and uninterruptible power supply (UPS) are provided

IV. main functions of the system

4.1 alarm function

the monitoring center obtains the alarm information sent by each fire detection equipment in time. After the alarm information is confirmed, it should be possible to release the fire information through modern communication. This release method can be paging the special manager through paging equipment, and in the future, it can also be directly connected with 119 fire treatment special line for direct alarm

4.2 geographical location prompt function of fire point

after receiving the alarm, the monitoring center will immediately retrieve the corresponding records in the database according to the globally addressed alarm point information, and automatically call up the real-time geographical location map, building relationship map, building appearance and structure map, floor plan, etc. At the same time, the information stored in the fire history database of the alarm point is retrieved to provide a reference for police handling

4.3 fire information processing function

in the fire information database

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