Inorganic porous explosion suppression material and preparation method thereof

Abstract

The application relates to the technical field of explosion suppression agents, in particular to a novel inorganic porous explosion suppression material and a preparation method thereof. The steps comprise the following: placing dried molecular sieves in a metal salt solution with the same volume as the water absorption amount of the molecular sieves, placing the molecular sieves in a constant-temperature oscillator for impregnation, then drying the molecular sieves in a blast drying oven for 12 hours, and then placing the molecular sieves in a muffle furnace for calcination for 5 hours, so that the molecular sieve powder modified by different metal ions is prepared. The prepared inorganic porous explosion suppression material has the advantages of being economic and efficient, low in cost, non-toxic and harmless, and applicable to industrial production, and can be applied to the field of methane explosion suppression.

Description

Technical Field

[0001] This application relates to the field of explosion suppressant technology, and more specifically, to an inorganic porous explosion suppressant material and its preparation method. Background Technology

[0002] With the increasing severity of global energy shortages and environmental degradation, the reform of the energy system is being deepened, and the development trend is shifting towards building a new energy system structure. The development and use of clean energy is accelerating, and clean energy, mainly composed of combustible gases, is developing rapidly and is gradually being widely used in industrial fuels, process production, city gas, and automobile engines.

[0003] Methane, as a clean energy source, is the main component of natural gas, coalbed methane, and biogas, and has wide applications in daily life and industrial production, playing a vital role in national and social development. Natural gas production reached 217.8 billion cubic meters, a 6.4% increase over the previous year, marking the sixth consecutive year of production growth exceeding 10 billion cubic meters. While natural gas's main component is CH4, explosions involving methane are often sudden and highly unpredictable, making them difficult to prevent.

[0004] Natural gas and methane explosion prevention has always been a key focus of my country's safety work. Domestic and international scholars have conducted extensive research in the field of explosion suppression, developing many economical and efficient methane explosion inhibitors. Currently, the most widely used powdered explosion suppressants include carbonates, phosphates, hydroxides, ferrocene, urea, and zeolites. Research results indicate that zeolites are a substance that can effectively suppress methane explosions.

[0005] Molecular sieves are hydrated alkali or alkaline earth metal aluminosilicate minerals, filled with tiny pores and channels. Based on this property of zeolites, they are used to screen molecules with excellent results. Their basic framework consists of SiO2 and AlO4 tetrahedra, forming a three-dimensional network of porous aluminosilicate crystals through the sharing of oxygen atoms. Because the AlO4 tetrahedra have a negative charge, they can bind cations such as sodium and potassium, maintaining the molecular sieve's electroneutrality. Sodium and potassium cations readily exchange with other cations in aqueous solutions, thus possessing a certain ion exchange capacity, which can be used in metal ion adsorption processes. Therefore, molecular sieves have been widely used in water purification, air purification, antibacterial materials, catalysts, and catalyst supports, and have been a research hotspot in the field of porous materials in recent years. Simultaneously, molecular sieves are high-performance refractory materials with excellent endothermic effects. Therefore, they can be studied as excellent materials for explosion suppressants. The available models include: ZSM-5, 3A (potassium A type), 4A (sodium A type), 5A (calcium A type), 10Z (calcium Z type), 13Z (sodium Z type), Y (sodium Y type), and sodium mordenite zeolite type. However, their suppression effect on monomeric detonators is somewhat limited and cannot meet the requirements of practical applications. Furthermore, further research has revealed that unmodified zeolite molecular sieve detonators do not exhibit superior detonation suppression performance. Summary of the Invention

[0006] This disclosure provides an inorganic porous explosion suppression material and its preparation method. The prepared inorganic porous explosion suppression material has the advantages of being economical and efficient, low cost, non-toxic and harmless, and suitable for industrial production, and can be applied in the field of methane explosion suppression.

[0007] In one aspect, this disclosure provides an inorganic porous explosion suppression material, comprising the following components: 1-5 parts of molecular sieve and 10-50 parts of metal chloride solution.

[0008] Preferably, the molecular screening uses ZSM-5 molecular sieve.

[0009] Preferably, the metal chloride solution is one of potassium chloride, calcium chloride, magnesium chloride, and ferric chloride.

[0010] Secondly, this disclosure provides a method for preparing an inorganic porous explosion-suppressing material, comprising the following steps: (1) The dried ZSM-5 molecular sieve is placed in the metal salt solution and immersed in a constant temperature shaker at room temperature to obtain a liquid; (2) The impregnated liquid is dried in a forced-air drying oven at 120°C for 12-24 hours to obtain powder; (3) The powder is calcined in a muffle furnace at 550°C for 5-8 hours to obtain molecular sieve powders modified with different metal ions.

[0011] Preferably, in step (1), the soaking time is 6-24 hours.

[0012] In summary, this application has the following beneficial effects: 1. The operation in this application is simple, the raw materials are relatively common and inexpensive, and it can be used for large-scale production; 2. The molecular sieve in this application possesses characteristics such as environmental friendliness, well-developed pore structure, and large specific surface area. The numerous cations present in the molecular sieve's pore structure can exchange with other cations. Due to differences in cation charge, size, and distribution, the electrostatic field inside the molecular sieve crystal and the pore size will change after the exchange, thereby altering the adsorption and shape-selective adsorption separation performance of the molecular sieve. Therefore, loading metal ions onto its surface can adsorb a large number of free radicals. Through surface interaction, the free radicals in the explosion reaction are consumed, drastically reducing the number of free radicals, causing the chain reaction to be interrupted, ultimately suppressing methane explosions and improving the explosion suppression performance of single powders.

[0013] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the scope of protection of this disclosure. Detailed Implementation

[0014] The following detailed description of this application is provided in conjunction with the embodiments. It should be noted that: unless otherwise specified, the conditions in the following embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments are all from commercially available sources.

[0015] Example Example 1 The dried ZSM-5 molecular sieve was placed in a potassium chloride solution of equal volume to its water absorption capacity, immersed in a constant temperature shaker at 20°C for 6 hours, then dried in a forced-air drying oven at 120°C for 12 hours, and calcined in a muffle furnace at 550°C for 5 hours to obtain the modified molecular sieve powder.

[0016] Example 2 The dried ZSM-5 molecular sieve was placed in a potassium chloride solution of equal volume to its water absorption capacity, immersed in a constant temperature shaker at 20°C for 24 hours, then dried in a forced-air drying oven at 120°C for 12 hours, and calcined in a muffle furnace at 550°C for 5 hours to obtain the modified molecular sieve powder. Example 3 The dried ZSM-5 molecular sieve was placed in a calcium chloride solution of equal volume to its water absorption capacity, immersed in a constant temperature shaker at 20°C for 6 hours, then dried in a forced-air drying oven at 120°C for 12 hours, and calcined in a muffle furnace at 550°C for 5 hours to obtain the modified molecular sieve powder.

[0017] Example 4 The dried ZSM-5 molecular sieve was placed in a calcium chloride solution of equal volume to its water absorption capacity, immersed in a constant temperature shaker at 20°C for 24 hours, then dried in a forced-air drying oven at 120°C for 12 hours, and calcined in a muffle furnace at 550°C for 5 hours to obtain the modified molecular sieve powder.

[0018] Example 5 The dried ZSM-5 molecular sieve was placed in a magnesium chloride solution of equal volume to its water absorption capacity, immersed in a constant temperature shaker at 20°C for 6 hours, then dried in a forced-air drying oven at 120°C for 12 hours, and calcined in a muffle furnace at 550°C for 5 hours to obtain the modified molecular sieve powder.

[0019] Example 6 The dried ZSM-5 molecular sieve was placed in a magnesium chloride solution of equal volume to its water absorption capacity, immersed in a constant temperature shaker at 20°C for 24 hours, then dried in a forced-air drying oven at 120°C for 12 hours, and calcined in a muffle furnace at 550°C for 5 hours to obtain the modified molecular sieve powder.

[0020] Example 7 The dried ZSM-5 molecular sieve was placed in a ferric chloride solution of equal volume to its water absorption capacity, immersed in a constant temperature shaker at 20°C for 6 hours, then dried in a forced-air drying oven at 120°C for 12 hours, and calcined in a muffle furnace at 550°C for 5 hours to obtain the modified molecular sieve powder.

[0021] Example 8 The dried ZSM-5 molecular sieve was placed in a ferric chloride solution of equal volume to its water absorption capacity, immersed in a constant temperature shaker at 20°C for 24 hours, then dried in a forced-air drying oven at 120°C for 12 hours, and calcined in a muffle furnace at 550°C for 5 hours to obtain the modified molecular sieve powder.

[0022] The explosion suppression materials prepared in Examples 1-8 and the control group (unmodified ZSM-5 molecular sieve) were placed in an environment with a methane concentration of 9.5% for explosion suppression testing, and the specific surface area of ​​each sample was tested. The test results are shown in Table 1.

[0023] Table 1 shows the test results of the specific surface area and maximum explosion pressure of the explosion suppression materials prepared in Examples 1-8 and the control group.

[0024]

[0025] Table 1 shows that the explosion suppression effect of the modified molecular sieve powder is significantly higher than that of the unmodified molecular sieve powder. Among them, the potassium-containing ZSM-5 molecular sieve has a better explosion suppression effect, and the optimal explosion suppression effect is achieved when impregnated for 24 hours. Compared with the unmodified ZSM-5 molecular sieve powder, the explosion pressure of methane is reduced by 8.48 mbar. Therefore, it can be seen that the molecular sieve modified by ions has a better explosion suppression effect.

[0026] The above description is merely an exemplary embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. The application of an inorganic porous explosion suppression material in methane explosion suppression, wherein the inorganic porous explosion suppression material is prepared from the following components: 1-5 parts of ZSM-5 molecular sieve and 10-50 parts of metal chloride solution; The preparation method of the inorganic porous explosion-suppressing material includes the following steps: (1) The dried ZSM-5 molecular sieve is placed in a metal chloride solution with an equal volume of water absorption, and immersed in a constant temperature shaker at room temperature for 6-24 hours to obtain a liquid; the metal chloride solution is one of potassium chloride, calcium chloride, magnesium chloride, and ferric chloride; (2) The impregnated liquid is dried in a forced-air drying oven at 120°C for 12-24 hours to obtain powder; (3) The powder is calcined in a muffle furnace at 550°C for 5-8 hours to obtain metal ion modified molecular sieve powder.

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