Foam extinguishing principle Pressure type proportional mixing device Price classification Applicable place

Description :

　　The essential conditions for combustion include combustibles, combustion aids, temperature, and the need for an uncontrolled chain reaction in flameless combustion.

　　The basic principles of fire extinguishing can be summarized into four aspects: cooling, suffocation, isolation, and chemical suppression.

　　All substances produced by combustion or pyrolysis are called combustion products. Combustion products usually refer to gases, heat, visible smoke, etc. generated by combustion.

　　1. The gases generated by combustion generally refer to carbon monoxide, hydrogen cyanide, carbon dioxide, acrolein, hydrogen chloride, sulfur dioxide, etc.

　　The combustion of most substances is an exothermic chemical oxidation process. The energy released from this process is expressed in the form of heat, forming convection and radiation of hot gases. Heat has significant physical hazards to the human body.

　　3. Solid and/or liquid particles suspended in the atmosphere produced by combustion or pyrolysis are collectively referred to as smoke. Its particle size is generally 0.01-10 microns. This carbon containing substance is generated by incomplete combustion in a fire. The quantity and composition of combustion products vary with the chemical composition of the substance, as well as changes in temperature and air supply. Toxicity of combustion products: see page 20 of the "Fire Supervision and Inspection".

　　Carbon dioxide is one of the main combustion products, with a concentration of up to 15% in some fire scenes. Its main physiological function is to stimulate the respiratory center of humans, leading to rapid breathing and increased inhalation of smoke. And it can also cause symptoms such as headaches and confusion. Carbon monoxide is one of the main deadly combustion products in fires, and its toxicity lies in its high affinity for hemoglobin in the blood. Its affinity for hemoglobin is 250 times higher than that for oxygen, so it can hinder the delivery of oxygen in the human blood, causing symptoms such as headaches, fatigue, confusion, and muscle dysregulation.

　　Water is a commonly used fire extinguishing agent, with convenient application, abundant sources, and low price. Therefore, it has been widely used in fire scenes.

　　Water cannot extinguish fires caused by the following substances and equipment: fires caused by alkali metals, fires caused by carbonization, hydrogenation, and yellowing; Sulfuric acid, nitric acid, and hydrochloric acid should not be extinguished with strong water; Light and insoluble in flammable liquids (excluding oil and heavy oil); Molten iron and steel; When there is a fire in high-voltage electrical equipment and there is no good grounding equipment or the current is not cut off; Wait for the situation.

　　Foam is a group of bubbles with small volume and surrounded by liquid on the surface, which only fights fires caused by flammable liquid and gas. The foam used in China includes chemical foam and air mechanical foam (air foam for short).

　　The main principle of foam fire extinguishing is that foam is lighter than flammable and combustible liquids, and it covers the liquid surface on fire to prevent liquid vapor from entering the combustion area, prevent air from contacting the burning surface, prevent heat from conduction to the liquid surface, and absorb certain heat, thus stopping combustion.

　　The pressure type foam proportioning device is used to store foam extinguishing agent and replace foam extinguishing agent through the pressure type foam proportioner using the water supply of the pump set, and mix with the water supply in a certain proportion to form foam mixture.

　　The pressure type foam proportional mixing device is a common foam extinguishing equipment at present. The pressure type foam proportioning device is easy to install, use and maintain, with excellent built-in corrosion resistance, relatively economical cost, stable and reliable performance, and is especially suitable for medium and small flow foam fire extinguishing systems. Mainly applicable to places where flammable or combustible liquids are produced, stored, transported, and used; Fire hazard areas such as petrochemical enterprises, oil depots, loading and unloading docks, ship docks, oil extraction platforms, aircraft hangars, and automobile garages.

　　The pressure type foam proportioning device can be divided into horizontal, vertical, single proportioning mixer, double proportioning mixer, etc. according to the structure type, and users can choose according to the actual configuration needs and the location of the installation space.

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