KR20080041375A - A refrigerant composition for gas generator - Google Patents

Abstract

A coolant composition for a gas generator is provided to realize high heat-absorbing capability and to enable production of tablets or pills having high durability and low moisture-absorbing capability and useful for a gas generator for fire extinguishing aerosol. A coolant composition for a gas generator comprises: 20.0-60.0 wt% of magnesium carbonate; 10.0-35.0 wt% of calcium hydrogen sulfate; and other technical additives. The coolant composition further comprises 5.0-40.0 wt% of an oxidizing agent. The oxidizing agent includes an acetate salt, perchlorate salt, unstable alkali metal salt or a mixture thereof. Additionally, the coolant composition optionally comprises 5.0-20.0 wt% of boric acid.

Description

Coolant composition for gas generator {A REFRIGERANT COMPOSITION FOR GAS GENERATOR}

The present invention is a gas generator for use in extinguishing fires of various types of traffic such as buildings, garages, fuel storage, baggage storages, passenger rooms, etc. Regarding cooling composition

Coolants of a certain quality can be used for floating materials and also for evaporating or decomposing heat to absorb large amounts of warmth to generate a large amount of cooling gas.

As a conventional fire extinguishing device, aerosol cooling (refrigeration) is well known. It has the form of a cladding of the body and the nozzle, an air ejector connected to the nozzle, or a reservoir filled with coolant and located around the nozzle and connected to the body (report PCT / US 93/01234 93.02.10, WO 93/15793). 93.08.10).

Also widely known are gas generating powder fire extinguishers and thermal decomposition powders of chemical substances (Patent US No. 3647393, published in 1972.).

However, well known heat absorbing materials are either too bulky or too low efficiency as extinguishing aerosol coolants, making them difficult to use.

Also known US patent No5609210 (MPK A 62 C 35/02, published 1977) << Fire extinguisher and equipment >>. Citing mixtures of technical equipment, the mixture that enters the chamber of the gas generator is filled with magnesium, calcium, strontium, aluminum, magnesium oxide, potassium carbonate, and other alloys.

The obstacles to this use are the durability of the pellets crushed during the compaction process (Q <0.5kg / ㎠) and the use of the device due to the absorption of moisture in the vibration state of the mobile vehicle. Lack of durability in a vibrating state results in the destruction of the coolant pellets, resulting in failure of the gas generator and a decrease in the cooling effect of the aerosol gas jet.

The present invention to solve the above problems

It is a high-efficiency coolant that can make eggs or tablets with high heat absorption and blind durability, high durability, low wear and low water absorption. This allows the use of a coolant in the gasgenerator for fire-extinguishing aerosol (GFA), which is used in the inertial and vibrational forces of a multipurpose vehicle.

The result of this work is the manufacture of a coolant that can further reduce the carbon dioxide content that produces the aerosol compresses, making it possible to apply the GFA to passengers in homes and transportation.

The solution of the given problem is the goal of the limiting invention.

Technical results obtained using the invention have the ability to relate to the guarantee of the coolant and the high strength properties of the tablets (pills) produced (up to 1.6 mPa!). Have.

In addition to lowering the temperature of the gas stream, the coolant produces less carbon dioxide content.

The coolant blocks the flow of gas at low temperatures and lowers the carbon dioxide content.

To reduce hydrodynamic resistance to gas flow, coolant tablets (pills) with a diameter of 5-20 mm and a thickness of 3-15 mm are used. At this time, the relationship between the diameter of the tablet (pill) and the radius of the lower cross section is -d / r 0.05 ~ 1.3.

The technical results stated in the use of the proposed invention indicate that sulfuric acid and its technical additives, where the coolant component of the gas generator containing main magnesium carbonate and metal sulfate are hydrated as metal sulfate, have the following mass (%): It is characterized by containing.

Main Magnesium Carbonate --------------------------------------------- 20,0- 60,0.

Lactic acid calcium combined with hydrogen -------------------------------- 10,0-35,0

-Technical Additives ---------------------------------------------- ---Remainder

In order to further oxidize the carbon oxides emitted from the gas flow into carbon dioxide, the coolant component may contain 5.0 to 40.0% by mass of oxidizing agents, where nitrates, perchlorates, permanganates, alkali metal chromates or mixtures thereof are used. It is good.

In order to prepare tablets with high durability and low water absorption from the proposed components, it is recommended to add boric acid with 5.0-20.0% mass to the coolant components.

The best results can be obtained by using alkali or alkaline earth metal aspartates, gelatin, or mixtures thereof as technical additives.

This increases the flowability of the powder mixture, prevents solidification, simplifies the compression process and reduces the solid friction of the tablets. This improves the appearance of the tablet (it produces light) and reduces the chance of failure. In addition, the durability of the tablet is increased, and the stability against vibration force and inertia force is increased.

It is proposed to add metal carbonate group I or II in addition to the main ingredient of the raw material.

The features shown in the invention formula are necessary and sufficient to achieve the stated technical results, that is, essential.

The proposed invention is not known from an accessible source of information and cannot be based on obvious technical standards and can be applied industrially as a gas generator coolant component. In other words, it conforms to all patentability standards under current law.

Hereinafter, the present invention will be described in detail.

The gas generator coolant composition material of the present invention is as follows.

-Magnesium Oxide Carbonate GOST 6419-78

M MgCO3 '' Mg (OH) 2 nH20

n = 3.4

n = 3,4,5, .6

Magnesium Carbonate Mg (OH) 2 ----------------------------------- GOST 3244-76

Calcium Carbonate Mg (OH) 2 --------------------------------------- GOST 3189- 76

Sodium Carbonate Na2CO3 ------------------------------------- GOST 2156-76

-Boric Acid H3BO3 ----------------------------------------------- -GOST 9656-76

-Potassium and Chlorate KCIO4 --------------------------------- GOST 6-09-675-78

Super Potassium Hydrochloride KNO3 ---------------------------------------- GOST 19709-74

Potassium Hydroxide Hydrochloric Acid

Potassium CaCO4 0.5H2O --------------------------------------- TY 21-31-19 -77

Stearic Acid Sodium ---------------------------------- TY 6-09-17-275-90

Examples of Gas Generator Coolant Component Preparation

In large scale systems, the mixture is crushed into a proportion of the required components in a conventional manner. The quantitative and qualitative components of the components are shown in Table 1 following each proposed example.

In the resulting mixture, a tablet (pill) having a mass of 0.2 to 2.0, a diameter of 5 to 20 mm, and a thickness of 3 to 10 mm was prepared by a compression method of a pressure of 100.0 Mpa. 250g of coolant tablets (pills) are then placed along with 250g of aerosol-forming raw material propellant in the fire suppression gas generator body. The temperature of the output from which the propellant is burned is 1250-1350 ° C.

All sample experiments were done at the same conditions. Experiments with coolant tablets are described in Table 2.

As an experimental apparatus, an industrially manufactured fire extinguishing aerosol generator <doping-2> (TY 4854-001-17191106-95) was used.

Coolant layer height -75mm

Combustion material usage -10 -12 r / c

Temperature measurements were recorded on oscilloscopes (chromium droplets) with thermocouples.

Vibration experiments were carried out with a maximum load of 20g from the vibration stand at 9m height (experiment for development and transport loading).

The study of the durable properties of tablets obtained by the compression method was done according to standard methodology developed by the BNEEXF PET-2 apparatus.

Carbon dioxide (CO) content determination in the aerosol component was made in the zone where the generator is located. When the generator is running, digested concentrates are generated in the area, at which time gas samples are taken and the gas analyzer CO-CH (automatic test) analyzes the carbon dioxide content.

In order to determine the degree of water absorption of the coolant tablets, it is placed in an exsiccator generating 100% humidity. After this, the water absorption was calculated by adjusting the increase in tablet weight every 24 hours.

Table 1 shows the qualitative and quantitative ratios of the components. In Examples 1-3, the cooling component made according to the invention formula of Claim 1 is shown. Examples 4-12 are given the possible different kinds of components made by adding the components specified in the independent items to the invention formula. Numbers 13 and 14 represent cooling component mixtures that make the best use of all possible components by the invention formula.

The comparison of tablet sample experiments with the specified components allows us to conclude that the gas temperature at the outlet, the durability of the tablets, and these prototype components exceed those in the carbon oxide content (Table 2).

Reducing the quantitative proportion of the components in the cooling component, compared with that specified in the original section of the invention formula, significantly reduces the cooling caoability of the component. Increasing the quantitative content beyond that specified in the formula results in the adhesion of the cooling components, especially when large quantities of soluble outputs are produced and the generator is operated.

The quantitative proportions of all remaining components were chosen by experiment. The optimal ratio for the best technical results is given in the invention formula. The proposed mixture has fewer components than the prototype in terms of functional features.

The sale of cooling components ensures an increase in shelf life, economics, ease of development, elimination of defective raw materials and the product can be manufactured in any compression plant. This allows a wide variety of interests with different types of gas generator installations.

Thus, the present invention is used for extinguishing fires of various types of traffic such as closed buildings, garages, fuel storage, baggage depots, passenger compartments, etc. by the special components of the gas generator and the aerosol of the auxiliary solid fuel. The present invention relates to a cooling composition for a gas generator, and has an effect of improving suppression efficiency.

Claims (6)

Magnesium Carbonate 20.0-60.0% by weight Calcium Hydroxide Hydrochloric Acid 10.0-35.0% by weight Other weight & Coolant composition for a gas generator, characterized in that the mixture 2. The refrigerant composition according to claim 1, wherein the supplemental mass of the oxidant contains 5.0-40.0%. The gas generator cooling composition according to claim 2, wherein the oxidant component contains acetate, perchlorate, unstable alkaline metals, and other mixtures. The cooling composition for a gas generator according to claim 1, which contains 5.0-20.0% of a supplemental mass of boric acid. The gas generator coolant composition according to claim 1, which contains additives such as alkaline stearin, alkaline earth metal and gelatin. The cooling composition for a gas generator according to claim 1, wherein the metal carbonate contains 5.0-20.0% of a supplemental mass in Groups 1 and 2.