Inorganic low-silicon aluminum ratio explosion suppression material and preparation method thereof

Abstract

The application relates to the technical field of explosion suppression agent preparation, in particular to a novel inorganic low-silicon-aluminum-ratio explosion suppression material and a preparation method thereof.The steps of the preparation method comprise the following steps: placing dried molecular sieves in an alkali solution, placing the molecular sieves in a magnetic stirrer and stirring intensively, centrifugally separating the stirred sample, washing the sample with deionized water until neutral, drying the sample in a blast drying oven at 120 DEG C for 24 h, grinding the sample in a mortar for 10 min, and sieving to obtain explosion suppression powder.The prepared inorganic low-silicon-aluminum-ratio explosion suppression material has the advantages of high efficiency, low cost, non-toxicity and harmlessness, and can be used for industrial production and applied to the field of methane explosion suppression.

Description

Technical Field

[0001] This application relates to the field of explosion suppressant preparation technology, and more specifically, it relates to an inorganic low silicon-to-aluminum ratio 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 more robust energy system structure. The development and use of clean energy are accelerating, with clean energy sources, primarily combustible gases, experiencing rapid growth and finding widespread application in industrial fuels, process production, city gas, and automotive 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] Domestic and international scholars have conducted extensive research in the field of methane explosion suppression, developing many economical and efficient methane explosion inhibitors. Currently, the most widely used powder 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.

[0006] Therefore, in order to solve the problem that the explosion suppression effect of unmodified molecular sieve explosion suppressants is not obvious, an inorganic low silicon-aluminum ratio explosion suppressant is proposed to make up for the shortcomings of monomeric explosion suppressants. Summary of the Invention

[0007] This disclosure provides an inorganic low silicon-to-aluminum ratio explosion suppressant material and its preparation method, which addresses the shortcomings of existing monomeric powder explosion suppressants, which have poor explosion suppressing effects or cumbersome preparation processes that cannot meet the needs of practical production applications.

[0008] In one aspect, this disclosure provides an inorganic low silicon-to-aluminum ratio explosion-suppressing material, comprising the following components: 1-5 parts of molecular sieve and 100-300 parts of alkaline solution.

[0009] Preferably, the molecular screening uses one of type A, type X, type Y, or ZSM-5 molecular sieves.

[0010] Preferably, the alkaline solution is one or more of Na2CO3, CaCO3, and NaOH.

[0011] Secondly, this disclosure provides a method for preparing an inorganic low silicon-to-aluminum ratio explosion-suppressing material, comprising the following steps:

[0012] (1) Place the dried molecular sieve in the alkaline solution and stir vigorously in a magnetic stirrer;

[0013] (2) After stirring, the sample was separated by centrifugation, washed with deionized water until neutral, and dried in a forced-air drying oven at 120°C for 24 hours to obtain a solid material;

[0014] (3) Grind the solid material in a mortar for 10-20 minutes and then sieve it to obtain explosion-suppressing powder.

[0015] Preferably, in step (1), a forced-air drying oven is used for drying, with the temperature set at 120°C for 24 hours.

[0016] Preferably, in step (1), the stirring time is 1-5 hours.

[0017] Thirdly, this disclosure provides an application of an inorganic low silicon-to-aluminum ratio explosion suppression material, which is used in the methane explosion suppression process.

[0018] In summary, this application has the following beneficial effects:

[0019] 1. The molecular sieve in this application is characterized by its environmental friendliness, well-developed pore structure, and large specific surface area. The explosion-suppressing effect of the alkali-treated powder includes adsorption, barrier effect, and consumption of free radicals generated during the explosion. As shown in the above pore structure analysis, ZSM-5 molecular sieve has a well-developed pore structure, and the specific pore volume and pore size distribution of ZSM-5 molecular sieve increased after alkali treatment, allowing for better adsorption of methane molecules and thus exhibiting adsorption properties. When methane gas is ignited in the pipeline, it collides with the powder particles suspended inside the pipeline. When the flame contacts the pores of the ZSM-5 molecular sieve, a cold wall effect occurs, causing the flame to change from continuous propagation to discrete propagation, thereby reducing the flame propagation speed. ZSM-5 molecular sieve is difficult to decompose at high temperatures, thus acting as a barrier to dilute methane gas. Simultaneously, the desorption of its contained moisture in a high-temperature environment absorbs some of the heat generated by the flame, thus playing a role in explosion suppression.

[0020] 2. This application is simple to operate, uses relatively common and inexpensive raw materials, and can be used for large-scale production.

[0021] 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. Attached Figure Description

[0022] 1. Figure 1 These are the XRD patterns of ZSM-5 molecular sieves with different silica-to-alumina ratios in this application;

[0023] 2. Figure 2 These are the explosion pressure curves of ZSM-5 molecular sieve explosion suppression powders with different silicon-to-aluminum ratios in this application. Detailed Implementation

[0024] 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.

[0025] Example

[0026] Example 1

[0027] The dried ZSM-5 molecular sieve was placed in an alkaline solution and stirred vigorously in a magnetic stirrer for 1 hour. The stirred sample was then separated by centrifugation, washed with deionized water until neutral, dried in a forced-air drying oven at 120°C for 24 hours, ground in a mortar and pestle, and then sieved to obtain the explosion-suppressing powder.

[0028] Example 2

[0029] The dried ZSM-5 molecular sieve was placed in an alkaline solution and stirred vigorously in a magnetic stirrer for 2 hours. The stirred sample was then separated by centrifugation, washed with deionized water until neutral, dried in a forced-air drying oven at 120°C for 24 hours, ground in a mortar and pestle, and sieved to obtain the explosion-suppressing powder.

[0030] Example 3

[0031] The dried ZSM-5 molecular sieve was placed in an alkaline solution and stirred vigorously in a magnetic stirrer for 3 hours. The stirred sample was then separated by centrifugation, washed with deionized water until neutral, dried in a forced-air drying oven at 120°C for 24 hours, ground in a mortar and pestle, and then sieved to obtain the explosion-suppressing powder.

[0032] Example 4

[0033] The dried ZSM-5 molecular sieve was placed in an alkaline solution and stirred vigorously in a magnetic stirrer for 4 hours. The stirred sample was then separated by centrifugation, washed with deionized water until neutral, dried in a forced-air drying oven at 120°C for 24 hours, ground in a mortar and pestle, and sieved to obtain the explosion-suppressing powder.

[0034] Example 5

[0035] The dried ZSM-5 molecular sieve was placed in an alkaline solution and stirred vigorously in a magnetic stirrer for 5 hours. The stirred sample was then separated by centrifugation, washed with deionized water until neutral, dried in a forced-air drying oven at 120°C for 24 hours, ground in a mortar and pestle, and sieved to obtain the explosion-suppressing powder.

[0036] Comparative Example

[0037] The inorganic low silicon-to-aluminum ratio explosion suppressant material was prepared according to the method of Example 1, except that it was made without treated ZSM-5 molecular sieve.

[0038] The anti-explosive powders prepared in Examples 1-5 were characterized by XRD using a Rigaku D / max2550VB / PC rotating target X-ray polycrystalline diffractometer (Japan). A copper target was used as the radiation source, and the scanning speed was 2° / min. Wide-angle diffraction was employed from 2° to 50°. The test results are as follows: Figure 1 As shown.

[0039] Figure 1 The XRD patterns of ZSM-5 and alkali-treated ZSM-5 molecular sieves are shown. As can be seen from the figure, both alkali-treated and alkali-treated ZSM-5 molecular sieves exhibit the characteristic diffraction peaks of ZSM-5 molecular sieves, indicating that both possess typical MFI crystal structures. Furthermore, the peak positions and intensities did not change significantly, suggesting that the crystal structure of ZSM-5 molecular sieves was well preserved during alkali treatment. The relative crystallinity of alkali-treated ZSM-5 molecular sieves increased with modification time, showing a higher degree than that of ZSM-5 molecular sieves. This is because the disordered structure on the surface of ZSM-5 molecular sieves was removed during alkali treatment, increasing the ordered degree of the crystals on the sieve surface. These results indicate that alkali treatment did not destroy the crystal structure of ZSM-5 molecular sieves, nor did it generate any unnecessary amorphous structures.

[0040] The explosion suppression materials prepared in Examples 1-5 and the comparative example were placed in an environment with a methane concentration of 9.5% for explosion suppression tests. The test results are shown in [Figure number missing]. Figure 2 .

[0041] The explosion pressure curves of ZSM-5 molecular sieves after treatment with different alkalis are as follows: Figure 2 As shown in (a), it can be seen from the figure that the methane explosion pressure was reduced to varying degrees after adding the explosion suppression powder. The powder with the best explosion suppression effect was Z5-5, which reduced the maximum explosion pressure by 27% compared with the non-powdered condition. The suppression effect from strong to weak was Z5-5, Z5-4, Z5-3, Z5-2, and Z5-1.

[0042] Table 1 shows the test results of the explosion suppression materials prepared in Examples 1-5 and the control group, and the maximum explosion pressure and the maximum explosion pressure reduction compared with air explosion.

[0043] Table 1. Explosion suppression materials prepared in Examples 1-5 and the control group, and the maximum explosion pressure compared with airburst. Maximum explosion pressure reduction measurements.

[0044]

[0045] Table 1 shows that the explosion suppression effect of the molecular sieve powder treated with alkali is significantly higher than that of the untreated molecular sieve powder. Among them, the ZSM-5 molecular sieve with a stirring time of 5 hours has a better explosion suppression effect. Compared with the untreated ZSM-5 molecular sieve powder, the explosion pressure of methane is reduced by 27.17%. Therefore, it can be seen that the molecular sieve treated with alkali has a better explosion suppression effect.

[0046] 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. Use of inorganic low-silica alumina ratio explosion suppression material in the process of suppressing methane explosion, characterized in that, The inorganic low-silicon aluminum ratio explosion suppression material is formed by mixing 1-5 parts of the molecular sieve and 100-300 parts of the alkali solution and drying the mixture into a powder. The molecular sieve is ZSM-5 molecular sieve.

2. Use according to claim 1, characterized in that, The alkali solution is one or more of NaCO3, CaCO3 and NaOH.

3. Use according to claim 1, characterized in that, The preparation method of the inorganic low-silicon aluminum ratio explosion suppression material comprises the following steps: (1) placing the dried molecular sieve in the alkali solution and stirring vigorously in a magnetic stirrer; (2) centrifuging the stirred sample, washing with deionized water until neutral, and drying in a blast drying oven at 120℃ for 24 hours to obtain a solid material; (3) grinding the solid material with a mortar for 10-20 minutes and sieving to obtain an explosion suppression powder.

4. The use according to claim 3, characterized in that, In the step (1), the drying is performed using a blast drying oven, the temperature is set to 120℃, and the drying is performed for 24 hours.

5. The use according to claim 3, characterized in that, In the step (1), the stirring time is 1-5 hours.

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