JPH04284819A - Method for removing irritating gas generated from vessel with heat gernerating function - Google Patents

Abstract

PURPOSE:To absorb and remove irritating gas which is generated when a heating agent burns by using alkali substances mainly composed of one or more of Ca, Na, and K as insulation material in a vessel with heat generating functions wherein self-burning heating agent composed of iron oxide and powder of silicon is used. CONSTITUTION:A vessel with heat generating functions has an arrangement such that a self-burning heating agent composed of iron oxide powder, metallic and alloyed powder of silicon and a silicon-iron alloy, and an ignition agent 2 composed of oxide powder of iron oxide and one or more of copper oxide and boron powder are filled into a heating vessel in contact with each other, and an ignition device 3 and insulation material 4 are provided under the agent 1. And, as the material 4, an alkali substance mainly composed of one or more of Ca, Na, K is used. As the alkali substance, any substance which chemically reacts and adsorb irritating gas generated when the agent 1 burns can be used and, concretely, material mainly composed of alkali components such as calcium oxide, calcium carbonate, sodium hydroxide, potassium hydroxide can be used.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention uses iron oxide powder, silicon, and silicon as a heat source for rapidly heating water, oil, other liquids, and solids without using energy or fuel such as electricity, flammable gas, or hydrocarbons. The present invention relates to a method for removing irritating gas and smoke generated when heating a heating container using a self-combusting exothermic agent with high calorific density mixed with iron alloy powder.

0002

[Prior Art] In recent years, heat-generating products that utilize the heat generated by the hydration reaction of quicklime have been put into practical use due to their ease of operation and simplicity, and have been used to heat station lunches, as a heat source for warming sake, and as insecticide ingredients in insecticides. Atmospheric transpiration products and other products have been commercialized. In addition, a heating system using a self-combusting heating element that reacts instantly at a higher temperature than quicklime and has a high calorific density has also been proposed. For example, in JP-A No. 63-152572, a self-combusting exothermic agent consisting of potassium permanganate and iron powder is used as a container with a heat generating function, and the object to be heated is filled with potassium permanganate in a container with a convex shape on the inside of the container. and a heat-generating agent made of a mixture of metal powder or oxide powder and metal and alloy powder, and a heat-insulating material is placed so as to cover the entire exposed surface of the heat-generating agent, and is made of a breathable heat-insulating material, A method has been proposed in which inorganic porous materials such as rock powder, volcanic ash, glass powder, foamed materials of these materials such as vermiculite and perlite are used as breathable heat insulating materials, and the breathability of the inorganic porous material is utilized as a filter. JP-A-2-49612 describes a "container with a heating device" in which a self-combusting exothermic agent made of oxides, metals, and alloy powders is used as an ignition agent consisting of iron oxide and boron powder, which are easier to ignite than self-combustible exothermic agents. In order to remove the smoke and irritating gases generated when the exothermic agent burns, particles or fibers of alumina, silica, carbon, etc. are used under the exothermic agent to provide insulation and filter functions. A holding container is suggested.

However, in these conventional methods, it has been proposed to use materials such as porous breathable particles and carbon fibers for the purpose of removing adhesion of smoke particles and odor particles of irritating gases to the surface of the insulation material. However, using such heat insulating materials to physically adsorb the irritating gases generated by exothermic agents burns instantaneously and is also effective against self-combusting exothermic agents that are exposed to high temperatures. It is difficult to expect much from the heating vessel used, and in order to achieve this goal, we must install a large number of insulating materials, ensure sufficient contact time with the generated gas, and bring the temperature of the insulating materials to room temperature. If the physical adsorption effect did not decrease to , a sufficient physical adsorption effect could not be obtained, and the objective could not be achieved. However, with this method, the amount of insulation material used increases, resulting in an increase in the volume of the heating container.
The increased weight significantly impairs the portability of the heating container, making it unsuitable for practical use.

0004

[Problems to be Solved by the Invention] In view of the above problems, the present invention aims to remove the irritating gas and smoke generated when a self-combusting exothermic agent burns, and to manufacture a lighter and more compact heating container. The present invention provides a method for chemically adsorbing and removing irritating gas and smoke generated by a self-combusting exothermic agent to a practically acceptable level with a small amount of use.

[0005]

[Means for Solving the Problems] The present invention was made as a result of various experiments conducted by the inventors, and the gist thereof is to use iron oxide powder, silicon, silicon-iron alloy metal, and alloy powder. A heating container is filled with a self-combusting exothermic agent consisting of a self-combusting exothermic agent, and an ignition agent consisting of one or more oxide powders such as iron oxide powder and copper oxide, and boron powder in contact with the exothermic agent, and an igniter is installed at the bottom of the exothermic agent. In a container with a heat generating function that has a heat insulating material,
The insulation material is an alkaline material whose main component is one or more of Ca, Na, and K, a material that is a mixture of a breathable porous material and an alkaline material, or a breathable porous material impregnated with an alkaline aqueous solution and a fibrous heat insulating material. A method for removing irritating gas generated by a heating container with a heat generating function using a self-combusting exothermic agent, and a method for removing irritating gases generated by a heating container with a heat generating function using a self-combusting exothermic agent, and when installing a metal container lid with a gas vent hole provided at the bottom of the heating container, a breathable heat insulation method is used. A filter with a smoke removal function impregnated with an alkaline aqueous solution containing one or more of Ca, Na, and K as main components is installed in the gas exhaust path between the metal container and the metal container with gas vent holes. This is a method for removing irritating gases and smoke from a container with a heat generating function.

[0006] As the alkaline substance used here, any substance that can chemically react with and adsorb the irritating gas generated during combustion of the self-combusting exothermic agent can be used. Specifically, calcium oxide, calcium carbonate, Calcium hydroxide,
Sodium hydroxide, potassium hydroxide, sodium carbonate,
Materials whose main component is an alkaline component such as potassium carbonate can be used. Zeolite, perlite, activated carbon, vermiculite, etc. can be used as breathable porous materials, and rock wool, glass wool, ceramic wool, etc. can be used as fibrous insulation materials. However, the material is not particularly limited to these materials as long as it is breathable, has the function of absorbing and insulating the heat generated by the exothermic agent, and allowing the generated gas to pass through.

Furthermore, when filling the heat generating mechanism and sealing it with a metal container having gas vent holes, air permeable granular insulation is placed in the gas exhaust path between the breathable heat insulating material and the metal container having gas vent holes. A filter made of heat-resistant ceramic or glass is preferably used to prevent the material from falling out of the gas vent hole of the metal container and to remove irritating gases and smoke generated by exothermic agents. Paper and synthetic fiber filter materials can also be used, and when this filter material is treated with an alkaline aqueous solution containing one or more of Ca, Na, and K as its main components, it can be used to prevent irritation caused by the generation of self-combusting exothermic agents. It is possible to remove toxic gases and smoke.

[0008] The adsorption of irritating gases by these alkaline substances is a chemical reaction that takes place in a shorter time than conventional physical adsorption using air-permeable porous materials, and is more efficient in a shorter time than conventional physical adsorption methods. It is an effective gas adsorption method that can reactively absorb and adsorb irritating gases, and does not desorb due to heating or temperature rise of a self-combusting heating element. Furthermore, considering the amount of gas generated, it has a large adsorption effect with only a small amount of use. This is the method to obtain.

The operation of the present invention will be explained in detail below. Iron oxide powder, which is used industrially as a self-combusting exothermic agent, is mainly obtained by heating waste liquid from pickling of steel products, so it contains a considerable amount of hydrogen chloride. Furthermore, since steel products contain a large amount of sulfur, these components are gasified or reacted when the exothermic agent reacts and is heated, and are emitted as combustion exhaust gas. The composition of this gas is estimated to be chlorine-based and sulfur-based gases, especially hydrogen chloride, hydrogen sulfide,
Even a small amount of sulfur dioxide gas gives off a pungent odor, and these gases are also harmful to humans. This may make it particularly difficult to apply to heated products such as foods. Regarding the generation of this gas, it is difficult to perform accurate analysis because the self-combusting exothermic agent causes an instantaneous reaction, and its composition and timing of generation have not been clarified. Fe2O3 has an average particle size of 0.8μm and is used as a raw material for a self-combusting exothermic agent.
Using industrial grade iron oxide powder with a content of 99.5%, silicon powder with an average particle size of 10 μm and a Si content of 98.5%,
Self-combusting exothermic agent 8 uniformly mixed in a 2:1 weight ratio
0g, mixed with 0.85g of iron oxide powder reagent manufactured by Showa Kagaku Co., Ltd. and 0.15g of amorphous boron powder with a boron content of 96% or more manufactured by Hermann Schiesz Starck and used as an ignition agent. 35g of zeolite powder, diameter 55
A metal container with a height of 50 mm and a height of 50 mm is filled into a metal container, and the exhaust gas generated by the self-combusting exothermic agent is discharged from the bottom of the container. Continuous measurement analysis and detailed examination of exhaust gas composition and concentration were conducted. As a result, the generation peak of the irritating gas discharged from the heating container is immediately after the exothermic agent is combusted, and after that there is not much irritating gas generated, and the composition of the gas generated within 30 seconds after the exothermic agent is combusted is It was found that hydrogen chloride and hydrogen sulfide were mainly generated, and gases with these compositions were hardly detected one minute after the irritating odor was almost no longer detected. It was found that the maximum concentration of sulfur dioxide gas and carbon disulfide can be detected approximately one minute after the self-combusting exothermic agent ignites, but the amount generated is small and the level of impact on the human sense of smell and the human body is almost negligible. there were.

[0010] The timing of generation of such irritating gas,
As a result of detailed investigation of the gas composition, we found that the conventional gas adsorption method, which mainly uses physical adsorption, can efficiently adsorb gas by increasing the contact time with the gas and applying pressure.
It is not possible to sufficiently adsorb and remove the instantaneously generated gas, and furthermore, because the insulation material is heated to a maximum of 1000°C or more by the self-combusting exothermic agent, the irritating gas composition that is adsorbed in the early stage immediately after ignition. was found to be desorbed by heating and to have little effect.

[0011] Also, as a heat generating agent, iron oxide powder produced by crushing iron ore with a low chlorine and sulfur content to a size of 1 μm or less is used as a raw material to produce a heat generating agent, and the heat generating agent is incorporated into a heating container to investigate exhaust gas. The results also confirmed that a similar irritating gas was generated immediately after the exothermic agent was ignited and burned, and there was not much difference from the case when the exothermic agent used was a raw material with high chlorine and sulfur content. In this case, it is thought that the gas is generated from an ignition agent made of iron oxide powder and boron powder that is placed in contact with the exothermic agent to ignite and burn the exothermic agent, and both the igniter and the exothermic agent generate irritating gas. I understand. It is possible to remove the irritating gas by forcibly closing the gas exhaust hole to prevent the exothermic combustion gas from being discharged to the outside of the container, but in this case, This sealing is difficult because there is a risk of container damage and explosion due to the increased pressure inside the sealed container due to the generation of combustion gas, and there is a safety issue because a part that communicates with the outside is required to ignite the exothermic agent. It is not practical due to the following reasons. Based on the results of such detailed research, we conducted various studies on methods that can instantly adsorb the irritating gas composition generated by exothermic agents and are cost-effective, and the present application was invented as a result. It was concluded that chemical adsorption is possible by using a material that chemically reacts with the irritating gas generated during combustion of a self-combusting exothermic agent. The amount of exhaust gas generated by the exothermic agent was about 100 CC when the weight of the exothermic agent was 80 g, and the concentration of hydrogen chloride in the exhaust gas in this case was 1000 ppm at maximum, and hydrogen sulfide was 30 ppm. Sulfur dioxide gas and carbon disulfide were each at a barely noticeable level of 10 ppm. Based on this result, we mainly investigated the adsorption of hydrogen chloride and hydrogen sulfide, and found that alkaline substances are effective as chemical adsorption materials for these gas compositions. , calcium carbonate, calcium hydroxide, and porous breathable granular materials such as zeolite and perlite, as well as fibrous breathable heat insulating materials such as rock wool and ceramic wool, are treated with an aqueous sodium hydroxide solution to coat the particles and fiber surfaces and inside the pores. We investigated the effect of removing irritating gases generated when a self-combusting exothermic agent is combusted using a material in which sodium hydroxide particles are precipitated. As a result, calcium oxide,
When calcium carbonate is used as a heat insulating material, the hydrogen chloride concentration, which occurs when conventional zeolite and pearlite are used, is reduced to less than 1/3 of 400 ppm, and the hydrogen sulfide concentration is also reduced by 3.
It was reduced from 0 ppm to 10 ppm or less, and the irritating odor of exhaust gas was reduced to a level where it was practically not noticeable. It was confirmed that this method enables chemisorption removal of irritating gas compositions generated by self-combusting exothermic agents. The reaction with irritating gases due to chemisorption is due to a reaction in which the calcium material reacts with hydrogen chloride gas to produce calcium chloride and water. Furthermore, hydrogen sulfide gas and calcium react to form calcium sulfide or calcium hydrogen sulfide, which reacts and adsorbs hydrogen chloride and hydrogen sulfide. In this case, calcium hydroxide produces a large amount of water, and if it is used directly as an insulating material, it will generate water vapor when heated, and if calcium oxide is not stored in a completely dry state and sealed, it will absorb moisture in the outside air. It easily reacts with calcium hydroxide, making management complicated. Under such a reaction, a material that is industrially inexpensive and can be stably supplied is preferable for filling a metal heating container as a heat insulating material, and from this point of view, it is preferable to use limestone as calcium carbonate.

Furthermore, porous water-absorbing materials such as zeolite, perlite, and activated carbon, and fibrous heat-insulating materials such as rock wool, ceramic wool, and glass wool can be made into an aqueous solution of an alkaline material, allowed to absorb water, and then dried. Fine particles of alkaline substances are precipitated inside minute pores and on the surface of particles and fibers, which can be adsorbed by a chemical reaction with the irritating gas composition of hydrogen chloride and hydrogen sulfide, producing an irritating gas similar to that when filled with solid calcium material. The reduction effect was confirmed. The reaction in this case is a reaction in which it reacts with hydrogen chloride to produce sodium chloride and water, and hydrogen sulfide turns into sodium sulfide and sodium hydrogen sulfide.

The main reaction with hydrogen chloride is estimated to be based on the following equation. 1 mole of calcium-based components produces 2 hydrogen chloride
This is a reaction in which 1 mol of calcium chloride and 1 mol of water are produced by the reaction of 1 mol of calcium chloride, and in the case of calcium carbonate, 1 mol of carbon dioxide gas is generated, and in the case of calcium hydroxide, 2 mol of water is generated. In the case of sodium, 1 mole can adsorb 1 mole of hydrogen chloride. From this reaction equation, when the exhaust gas is 100 cc and the hydrogen chloride concentration is 1000 ppm, the required amounts of calcium oxide, calcium carbonate, and sodium hydroxide are 0.11 mg, 0.21 mg, and 0.18 mg, respectively.
It has been found that a very small amount is sufficient, and therefore, sufficient effects can be obtained even when mixed with breathable porous materials such as zeolite, perlite, and vermiculite. be. 2HCl+CaO→CaCl2 +H2 O2HCl+
CaCO3 →CaCl2 +H2 O+CO2 2H
Cl+Ca(OH)2 →CaCl2 +2H2 OH
Cl+NaOH→NaCl+H2 O2HCl+Na2
CO3 →2NaCl+H2 O+CO2 Regarding hydrogen sulfide, the number of moles that can be adsorbed changes depending on whether sulfide or hydrogen sulfide is generated, and the adsorption efficiency is higher when hydrogen sulfide is generated. Hydrogen sulfide gas is thought to be chemically adsorbed by the following reaction, and 30 ppm of hydrogen sulfide in 100 cc of gas can be absorbed by the weight of calcium oxide, calcium carbonate, and sodium hydroxide at a maximum of 0.01.
mg is sufficient, and adsorption is possible with a much smaller amount than hydrogen chloride. H2 S+CaO→CaS+H2 O 2H2 S+CaO→Ca(SH)2 +H2 OH2
S+CaCO3 →CaS+H2 O+CO2 2H
2 S+CaCO3 →Ca(SH)2 +H2 O+
CO2 H2 S+2NaOH→Na2 S+2H2 OH2
S+NaOH→NaHS+H2 OK also has the same reaction mechanism as Na and can adsorb irritating gases.

Furthermore, when a substance such as solid calcium carbonate is used as a heat insulating material, a heat insulating effect similar to that of the conventional method can be obtained, and the desired heating can be achieved without impeding the efficiency of heat conduction to the heated object. It has been confirmed that it has the following characteristics, and even when using a mixture of conventional insulation materials and alkaline substances,
Even when the breathable porous material was treated with an alkaline aqueous solution and used, no change in thermal properties was observed.

Furthermore, by providing a filter for removing smoke in the gas exhaust path between the heat insulating material and the container lid having a gas vent hole for discharging the gas generated by the self-combustible exothermic agent, the exothermic agent is generated during combustion. It becomes possible to remove the smoke generated by heating the inner surface of the metal container filled with and holding the smoke and exothermic agent. This filter can be one used for general air conditioning, and when exhaust gas passes through this filter, smoke particles are trapped inside the filter and removed. By treating this filter with an aqueous solution of an alkaline substance that reacts and adsorbs the irritating gas generated when the exothermic agent burns, it can also have the effect of removing irritating gases, allowing simultaneous removal of smoke and irritating gases. It becomes possible. This filter is installed under the insulation material so it is not exposed to very high temperatures, but the maximum temperature is 200
Since the temperature may reach close to ℃, it is preferable to use a heat-resistant glass fiber or ceramic fiber filter.

[0016]

[Example] Examples will be described below. Example 1 Fe2O3 Industrial grade iron oxide powder with a purity of 99% or more and an average particle size of 0.8 μm and silicon powder with a Si purity of 98% or more and an average particle size of 10.8 μm were mixed at a weight ratio of 2/1 in a high-speed rotating mixer. After homogeneous mixing for 5 minutes at a rotation speed of 3000 RPM using 1 g of the exothermic agent was placed at the center of the surface of the exothermic agent as an igniter, and pressed under a load of 1000 kgf to fill the container with the exothermic agent. An ignition jig with spark-generating pores is inserted into the lower part of the exothermic agent, and calcium oxide, calcium carbonate, calcium hydroxide powder or zeolite, perlite, or ceramic wool is added as a heat insulating material to sodium hydroxide at a concentration of 10% by weight. The space was filled with an air-permeable porous material that had been immersed in an aqueous solution and then dried, and a metal lid with gas vent holes was pushed in to seal it to prevent it from falling off. Using this container, a heating container having the structure shown in FIG. 1 was prototyped, and the concentration of hydrogen chloride and hydrogen sulfide was measured by the geotechnical method along with a sensory check of the odor intensity level of the exhaust gas. The results are shown in Table 1. Measurement results when filled with zeolite and pearlite using the conventional method are also shown as comparison materials.

[0017]

[Table 1]

As a result, in the conventional method, the hydrogen chloride concentration reached a maximum of 800 ppm when zeolite was used, and reached 1000 ppm when pearlite, which has almost no gas adsorption ability, was used, and hydrogen sulfide was also detected at 30 ppm. The pungent odor observed in the sensory check was a pungent odor of hydrogen sulfide, hydrochloric acid, and rotten egg-like odor. On the other hand, in the method according to the present invention, the hydrogen chloride gas concentration is 1
00ppm or less, hydrogen sulfide gas concentration is also 10ppm
It was significantly reduced to below, and was hardly noticeable even in sensory observation, and was at a level that did not pose any practical problems. Whether solid calcium carbonate or calcium hydroxide is used as a heat insulator or zeolite, perlite, or ceramic wool is treated with an aqueous solution of sodium hydroxide, there is almost no difference in gas adsorption capacity under any conditions, and the results are the same regardless of the method. It was effective. At this time, 320 cc of water at 15°C was placed in a container in the heated area, and a self-combusting exothermic agent was ignited. However, in both the present application and the conventional method, the maximum temperature of water raised under any conditions was 99°C in 2.5 minutes. The temperature at the bottom of the container remained in the range of 160 to 180°C, and the heating properties remained unchanged.

Example 2 Fe2O3 Industrial grade iron oxide powder with a purity of 99% or more and an average particle size of 0.8 μm and silicon powder with a Si purity of 98% or more and an average particle size of 10.8 μm were mixed at a weight ratio of 2/1 at high speed. After uniformly mixing for 5 minutes at 3000 RPM using a rotary mixer, 80 g of the exothermic agent was weighed and filled into a 0.24 mm thick tin container with a diameter of 55 mm and a height of 50 mm, and iron oxide and boron were mixed. 1 g of the mixed powder was placed as an igniter at the center of the surface of the exothermic agent, and pressed under a load of 1000 kgf to fill the container with the exothermic agent. An ignition jig with spark-generating pores is inserted into the bottom of the exothermic agent, calcium carbonate and conventional zeolite are used as insulation materials, and a metal lid with gas vent holes is pushed in to secure the contents. During this process, a filter made of heat-resistant ceramic fibers and heat-resistant polyamide synthetic fibers with a thickness of 1.5 mm and a pressure drop of 10 mm between the insulation material and the metal lid is immersed in a 10% by weight aqueous sodium hydroxide solution and dried. It was installed as a seal and sealed to prevent it from falling off. Using this container, a heating container with the structure shown in Figure 1 was prototyped, and the intensity level of the odor of the exhaust gas and the sensory check of the smoke emission status were performed, as well as the concentrations of hydrogen chloride and hydrogen sulfide were measured using the geotechnical method. The results are shown in Table 2.

[0020]

[Table 2]

[0021] As a comparison material, the measurement results are also shown under the condition that zeolite and pearlite were filled as in the conventional method and no filter was provided between the heat insulating material and the metal lid. As a result, in the conventional method, the hydrogen chloride concentration reached a maximum of 800 ppm when using zeolite, and reached 1000 ppm when using perlite, which has almost no gas adsorption ability, and the hydrogen sulfide concentration also reached 2.
0ppm detected. The irritating odor observed in the sensory check was pungent and smelled like hydrochloric acid and rotten eggs, and a small amount of smoke was emitted for about 30 to 60 seconds immediately after the self-combusting exothermic agent ignited. Ta. On the other hand, in the method using the alkali-treated filter according to the present invention, the hydrogen chloride gas concentration was 100p.
pm or less, the hydrogen sulfide gas concentration was significantly reduced to 10 ppm or less, and the odor was hardly noticed by sensory observation.Furthermore, almost no smoke was emitted, which was at a level that caused no practical problems. In particular, when calcium carbonate was used as a heat insulating material, the concentration of odor components was further reduced, resulting in a more significant improvement effect. At this time, 320 cc of water at 15°C was placed in a container in the heated area, and a self-combusting exothermic agent was ignited. However, in both the present application and the conventional method, the maximum temperature of water under any conditions was raised to 99°C in 2.5 minutes. The temperature at the bottom of the container remained in the range of 160 to 180°C, and the heating properties remained unchanged.

[0022]

Effects of the Invention The present invention eliminates the irritating odor and smoke generated by a heating container that uses a self-combusting exothermic agent mainly composed of iron oxide and silicon powder, which have a high calorific density, by using an alkaline substance and an alkali-treated heat insulating material. This method uses a filter that has been treated with alkali to remove the exothermic agent, and compared to the conventional method of press-molding the exothermic agent, it can be removed more easily and effectively at a lower cost by keeping the exothermic agent in a container as a powder. Compared to conventional methods, the hydrogen chloride concentration can be reduced to 1/5 and the hydrogen sulfide concentration to about 1/5, making it possible to reduce the odor to an almost imperceptible level.In addition, smoke can be removed by using a filter, etc. This is a highly practical invention that can be used as a heating container without any problems.

[Brief explanation of the drawing]

FIG. 1: An example of a container structure of a heating system.

[Explanation of symbols]

1. Exothermic agent 2 Ignition agent 3 Ignition device 4 Insulation material 5 Filter 6 Container lid with gas vent hole 7 Heat generating component filling container 8 Container filled with heated material 9 Water

Claims (4)

[Claims] Claim 1: A self-combusting exothermic agent made of iron oxide powder, silicon, silicon-iron alloy metal, and alloy powder, and in contact with the exothermic agent, one or more oxide powders such as iron oxide powder and copper oxide. A heating container is filled with an ignition agent made of raw powder, and in a container with a heat generating function that has an ignition device and a heat insulating material under the heat generating agent, an alkaline substance containing one or more of Ca, Na, and K as a main component is added to the heat insulating material. A method for removing irritating gases generated from a heating container with a heat generating function using a self-combusting exothermic agent. [Claim 2] Claim 1, characterized in that the heat insulating material of the container with a heat generating function is made of a mixture of a breathable porous material and an alkaline substance containing one or more of Ca, Na, and K as main components. A method for removing irritating gases generated from a heating container with a heat generating function using a self-combusting exothermic agent as described above. [Claim 3] Ca, N is added to the heat insulating material of the container with heat generation function.
2. The heat generating function using a self-combusting exothermic agent according to claim 1, characterized in that a breathable porous material impregnated with an alkaline aqueous solution containing one or more of K and K as main components and a fibrous heat insulating material are used. A method for removing irritating gases generated from heating containers. 4. A self-combusting exothermic agent comprising iron oxide powder, silicon, silicon-iron alloy metal, and alloy powder, and in contact with the exothermic agent, one or more oxide powders such as iron oxide powder and copper oxide. When a heating container is filled with an ignition agent made of raw powder, and a container with a heat generating function has an ignition device and a breathable heat insulating material under the exothermic agent, and a metal container lid with a gas vent hole is installed at the bottom of these containers, Ca, Na, K in the gas exhaust path between the insulation material and the metal container with gas vent holes.
1. A method for removing irritating gases and smoke from a container with a heat generating function, characterized in that a filter having a smoke removing function is impregnated with an alkaline aqueous solution containing one or more types of as a main component.