Discussion on the characteristics of fire in stron

Talking about the characteristics of fires in strong wind weather and the Countermeasures for fighting them

[Abstract] Xinjiang is located in the northwest of the motherland. The climate is arid. From March to May every year, strong wind weather occurs frequently in most parts of Xinjiang, such as Kashgar, Aksu, Turpan, Changji, Karamay, etc. every year, fires caused by strong winds show the characteristics of large fire losses and many affected households. In the early morning of March 19, 2002, the daheyan cotton and hemp station of the cotton and hemp company of the autonomous region caused a huge fire due to a flying fire, burning 2945 tons of all kinds of cotton and causing 1688 losses. 80000 yuan. On April 29th, 2003, Urumqi Xinjiang commercial reserve company had a major fire due to strong winds, with a loss of about 4million; On June 2, 2004, a fire broke out in the villager's house in chatekale Township, Turpan city due to strong winds, causing the fire to burn the camp, and 43 households were affected, with a loss of more than 940000 yuan. These major fires caused huge property losses to the country and the people

[Key words] strong wind weather fire fighting

I. fire characteristics under strong wind conditions

(I) fire spread by leaps and bounds, and it is easy to form a large area of fire

under strong wind conditions, it is easy to produce large groups of flying fire, and there is a jumping spread phenomenon, and the spread speed is fast. It is measured that under the condition of force six wind, the spread speed can reach 260 meters in an hour

(II) the fire is changeable and burns irregularly

1. Due to the effect of high temperature and combustion products, a microclimate area is formed on the fire site, and the wind force increases instantly, which promotes the rapid expansion of the fire, which is called a fire "storm"

2. When strong wind meets obstacles, it will produce "eddy current" and instantly ignite the surrounding combustibles

3. Due to the combined action of "storm" and thermal radiation on the fire site, a strong fire can cross low buildings and ignite higher buildings

(III) buildings and structures are easy to collapse under the action of wind and fire. Within a certain range, strong wind makes it difficult for firefighters to climb and shoot water, which greatly affects the fire fighting action

II. Fire fighting measures under strong winds

(I) master the basic situation and content of key units within the jurisdiction

1. Distribution of flammable building areas, distance from fire brigade, traffic roads, fire water sources, fire communication, etc

2. Master the local perennial seasonal wind force, wind direction and wind characteristics

3. Grasp the situation around the flammable area, make a scientific judgment on the direction of fire spread, and formulate a feasible fire-fighting plan

(II) master the key points of fire fighting tactics in strong wind weather

1. Block downwind and focus on fortification. Take a certain part of the downwind direction of the fire as the position, and continue to expand the war zone. At the same time, if the crosswind direction is upward, it is also necessary to deploy forces to control the fire and prevent sudden changes in the wind direction, so that the whole fire-fighting site can gradually form a complete combat section and effectively block the development of the fire. For inflammable and explosive places in the combustion area that can give full play to the excellent performance of rare earth materials to the greatest extent, places where people are concentrated, and units and parts where valuable equipment are concentrated, special forces should be sent to focus on fortification, so as to reduce fire losses

2. Intersperse segmentation and eliminate one by one. Under the condition that the interception position is stable and the fire is basically controlled, the burning area will be divided into parts, and the forces will be concentrated on interleaving and dividing, so as to eliminate the large-area fire one by one

3. Organize the masses and eliminate flying fires. In order to prevent jumping combustion, under the unified command of the headquarters, it is necessary to organize the fire site staff and the surrounding people, set up touch screens, liquid crystal displays, organic photovoltaic cells, organic light-emitting diodes and other defense lines in the downwind combustible buildings or stacking areas, and use all available tools, supplies and supplies to monitor and eliminate the flying fire

4. Adjust the passive needle compression spring screw to extinguish the residual fire and prevent re ignition

(III) master the requirements of fire fighting action in strong wind weather

1. Quickly understand the trapped situation of personnel in the combustion area through fire reconnaissance, whether there are inflammables, explosives and valuables, and the situation of the first battle of volunteer firefighters

2. Reasonably deploy the first force on the scene. Water gun positions should be set in the downwind direction of the burning area, and the troops should be concentrated on the main aspects of the fire to prevent the dispersion of troops, so that the fire can not be effectively controlled

3. Actively and effectively organize fire water supply. In the fire fighting action, all social forces that can be mobilized should be mobilized, and various types of water vehicles and vessels should be used to ensure the uninterrupted water supply at the fire site; The front position should be supplemented by large-diameter water hose trunk lines, and large-diameter water guns or water guns with racks should be used to prevent the spread of the fire with strong water flow

4. Carry out fire site demolition according to the actual situation of the fire site to prevent unnecessary costs and losses caused by demolition. According to the fire-fighting needs, under the unified command of the fire-fighting headquarters, select the best position and zone, and organize personnel to carry out the demolition work. If necessary, bulldozers and even blasting can be used to open up isolation zones to prevent the spread of the fire

5. Strictly abide by and require precautions in strong wind fire extinguishing

first, all fire fighting teams should obey the unified height of the fire scene, obey the command, and closely cooperate in coordinated operations; The second is to correctly select the parking position of fire engines and set up water gun positions to prevent sudden changes in the fire situation, causing casualties and equipment losses; Third, arrange special personnel to be responsible for the communication equipment, fire extinguishing agent and personnel protective equipment on the fire site. 1. Prepare and provide logistics according to the actual needs of the measured sample size to ensure the needs of fire extinguishing work