Method for extracting hydrogen from light magnesium powder by mixing hydrogen channel in natural gas pipe

Abstract

The application discloses a method for extracting hydrogen by mixing hydrogen into natural gas pipes and conveying light Mg powder, which comprises the following steps: step one, magnesium powder treatment; step two, rapid quenching treatment; step three, catalytic addition; step four, hydrogen mixing and conveying; step five, environment arrangement; and step six, hydrogen extraction. According to the application, the residual oxide layer on the surface of magnesium powder is removed through magnesium powder treatment, so that the adhesion process of hydrogen is prevented from being hindered by the oxide layer, thereby guaranteeing the adsorption effect of the magnesium powder. The magnesium powder is subjected to rapid quenching treatment in a vacuum furnace, and the amorphization degree and capacity retention rate of the magnesium powder are improved through circulation operation, so that the preparation process is simple, the preparation process difficulty of a separation reagent is reduced, and the practicability of the method is improved. Platinum powder is added in the ball milling process to catalytically treat the magnesium powder, so that the hydrogen bond reaction between particles in the prepared hydrogen-absorbing magnesium powder is reduced, the adsorption activity of adsorption points on the surface layer is improved, the diffusion speed of hydrogen particles is accelerated, and the extraction efficiency of hydrogen is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen-mixed natural gas separation, in particular to a method for extracting hydrogen from light Mg powder in a hydrogen-mixed natural gas pipeline. BACKGROUND

[0002] Hydrogen energy, as a clean energy, can be obtained through various ways such as primary energy, secondary energy and industrial field. Hydrogen energy utilization cannot be separated from the links of hydrogen production, storage, transportation and use. Hydrogen-mixed natural gas pipeline transportation is an important way to solve the hydrogen transportation link. After transportation, hydrogen needs to be separated and extracted from hydrogen-mixed natural gas. The existing hydrogen separation and extraction method can basically meet the daily use requirements, but still has some deficiencies. First, the magnesium powder used in the existing hydrogen separation and extraction method is not treated before preparation. The oxide layer remaining on the surface of the magnesium powder will affect the adsorption effect of the magnesium powder. Second, the preparation process of the reagent used in the existing extraction method is complicated, which is difficult to use in large-scale separation process, thereby affecting the practicability of the method. Third, the alloy kinetics performance of the extraction agent used in the existing hydrogen separation and extraction method is poor, and the adsorption activity of the surface layer as the adsorption point is low, which affects the diffusion speed of hydrogen particles and reduces the extraction efficiency of hydrogen. Therefore, it is necessary to design a method for extracting hydrogen from light Mg powder in a hydrogen-mixed natural gas pipeline. SUMMARY

[0003] The present application relates to the technical field of hydrogen-mixed natural gas separation, in particular to a method for extracting hydrogen from light Mg powder in a hydrogen-mixed natural gas pipeline.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a method for extracting hydrogen from light Mg powder in a hydrogen-mixed natural gas pipeline, comprising the following steps: step one, magnesium powder treatment; step two, rapid quenching treatment; step three, catalytic addition; step four, hydrogen-mixed transportation; step five, environment arrangement; step six, hydrogen extraction.

[0005] In the above step one, the magnesium powder raw material is placed in a treatment tank, then continuously washed with hydrochloric acid solution, then soaked and filtered in a filter tank with distilled water, and then dried in an oven. After drying treatment, impurity-removed magnesium powder is obtained for standby use.

[0006] In the above step two, the impurity-removed magnesium powder obtained in step one is placed in a vacuum furnace, then nickel powder is added to the vacuum furnace, then the temperature of the vacuum furnace is increased to melt the raw material in the furnace, then rapid quenching treatment is performed in the vacuum furnace, and after repeated operation, amorphous magnesium powder is obtained for standby use.

[0007] In the above step three, the amorphous magnesium powder obtained in step two is placed in a ball mill, then platinum powder is added to the amorphous magnesium powder, and then ball milling treatment is performed in the ball mill. After ball milling treatment, hydrogen-absorbing magnesium powder is obtained for standby use.

[0008] In the above step four, hydrogen is mixed in natural gas by using a gas mixing device to form hydrogen-mixed natural gas, which is then transported to the demand end equipment by using a natural gas pipeline;

[0009] In the above step five, the hydrogen-mixed natural gas is received by a circulating adsorption tower in the demand end equipment, the top of the circulating adsorption tower is provided with a powder spraying device, the feed hopper of the powder spraying device is placed with the hydrogen-absorbing magnesium powder prepared in step three, and the bottom of the circulating adsorption tower is provided with a blower;

[0010] In the above step six, the hydrogen-mixed natural gas enters from the bottom of the circulating adsorption tower, the powder spraying device sprays the hydrogen-absorbing magnesium powder into the circulating adsorption tower, the blower at the bottom blows upward to make the hydrogen-absorbing magnesium powder fully mix with hydrogen and react to form MgH2, then graphene loaded Sc2O3 or graphene loaded TiO2 is blown down from the top of the tower under the condition of a temperature of 100℃ or above to fully catalyze the MgH2, then the blower is turned to blow the hydrogen-absorbing magnesium powder to the front end of the supply terminal, a hydrogen release device is arranged at the front end of the supply terminal, the working temperature of the hydrogen release device is set to 300℃ or above, under this condition, the MgH2 releases hydrogen, and finally the released hydrogen is transported to the supply terminal.

[0011] Preferably, in the above step one, the molar concentration of the hydrochloric acid solution used for continuous flushing is 0.3mol / L, the continuous flushing time is 10-15min, the temperature in the oven during drying treatment is 40-43℃, and the drying treatment time is 100-120min, and helium is continuously introduced into the oven during the drying treatment.

[0012] Preferably, in the above step two, the addition amount of nickel powder is 30%-35% of the mass of the impurity-removed magnesium powder, the temperature in the vacuum furnace during melting of the raw material is 1450-1500℃, the quenching speed during rapid quenching is 30-32m / s, and the number of repeated operations is 20-25 times.

[0013] Preferably, in the above step three, the addition amount of platinum powder is 0.8%-1% of the amorphous magnesium powder, the feed particle size during ball milling is 0.2-0.3mm, the rotation speed of the grinding disc of the ball mill during ball milling is 500-780r / min, and the temperature in the ball mill during ball milling is 65-68℃.

[0014] Preferably, in the above step four, during hydrogen mixing, the addition amount of hydrogen is 1%-3% of the volume of the natural gas, and the hydrogen pressure of the hydrogen-mixed natural gas after mixing is 1.05-1.17MPa.

[0015] Preferably, in the fifth step, the height of the circulating adsorption tower is 18 m, and the bottom of the circulating adsorption tower is provided with a magnesium powder recovery device, the magnesium powder recovery device is circularly connected with the powder spraying device, and the top of the circulating adsorption tower is provided with a natural gas conveying pipeline for conveying the separated natural gas.

[0016] Preferably, in the sixth step, the temperature in the circulating adsorption tower during the hydrogen extraction process is 300-350 DEG C, and the processing rate of the circulating adsorption tower is 135-180 m 3 / h.

[0017] Compared with the prior art, the method has the advantages that: the method can remove the residual oxide layer on the surface of the magnesium powder by continuously flushing the magnesium powder raw material with a hydrochloric acid solution, so that the residual oxide layer on the surface of the magnesium powder does not hinder the attachment process of hydrogen gas during the extraction process, thereby ensuring the adsorption effect of the magnesium powder; the method can improve the amorphization degree and capacity retention rate of the magnesium powder by subjecting the magnesium powder to rapid quenching treatment in a vacuum furnace and improving the amorphization degree and capacity retention rate of the magnesium powder through a circulating operation, so that the preparation process is simple, the preparation process difficulty of the separation reagent is reduced, and the practicability of the method is improved; the method can reduce the hydrogen bond reaction between particles in the prepared hydrogen absorbing magnesium powder by adding platinum powder to the magnesium powder for catalytic treatment in a ball milling process, so that the adsorption activity of the adsorption sites on the surface layer is improved, the diffusion speed of hydrogen particles is accelerated, and the extraction efficiency of hydrogen gas is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 The method is a flow chart of the application;

[0019] Fig. 2 The MgH2 in the application under different temperature conditions is a constant temperature hydrogen absorption curve diagram of graphene loaded Sc2O3 or graphene loaded TiO2.

[0020] Fig. 3 The MgH2 in the application under different temperature conditions is a constant temperature hydrogen absorption curve diagram of graphene loaded Sc2O3 or graphene loaded TiO2. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0022] Please refer to Figs. 1-3The application provides a method for extracting hydrogen by using a natural gas pipe mixed with hydrogen and light Mg powder, which comprises the following steps: step one, Mg powder treatment; step two, rapid quenching treatment; step three, catalyst addition; step four, hydrogen mixing and conveying; step five, environment arrangement; and step six, hydrogen extraction.

[0023] In step one, the Mg powder raw material is placed in a treatment tank, then hydrochloric acid solution is used for continuous flushing, the molar concentration of the hydrochloric acid solution used in the continuous flushing is 0.3 mol / L, the continuous flushing time is 10-15 min, then the Mg powder is placed in a filter tank for soaking and filtering with distilled water, then the Mg powder is placed in an oven for drying treatment, the temperature in the oven during the drying treatment is 40-43 DEG C, the drying treatment time is 100-120 min, helium gas is continuously introduced into the oven during the drying treatment, and the impurity-removed Mg powder is obtained after the drying treatment and is reserved;

[0024] In step two, the impurity-removed Mg powder obtained in step one is placed in a vacuum furnace, then nickel powder is added into the vacuum furnace, the addition amount of the nickel powder is 30%-35% of the mass of the impurity-removed Mg powder, then the temperature of the vacuum furnace is increased to melt the raw material in the furnace, the temperature in the vacuum furnace during the melting of the raw material is 1450-1500 DEG C, then rapid quenching treatment is carried out in the vacuum furnace, the quenching speed during the rapid quenching treatment is 30-32 m / s, and the non-crystalline Mg powder is obtained after the repeated operation for 20-25 times and is reserved;

[0025] In step three, the non-crystalline Mg powder obtained in step two is placed in a ball mill, then platinum powder is added into the non-crystalline Mg powder, the addition amount of the platinum powder is 0.8%-1% of the mass of the non-crystalline Mg powder, then ball milling treatment is carried out in the ball mill, the feeding particle size during the ball milling treatment is 0.2-0.3 mm, the rotating speed of the grinding disc of the ball mill during the ball milling treatment is 500-780 r / min, the temperature in the ball mill during the ball milling treatment is 65-68 DEG C, and the hydrogen-absorbing Mg powder is obtained after the ball milling treatment and is reserved;

[0026] In step four, a gas mixing device is used to mix hydrogen into natural gas to form mixed hydrogen natural gas, the addition amount of the hydrogen during the mixing is 1%-3% of the volume of the natural gas, the hydrogen pressure of the mixed hydrogen natural gas after the mixing is 1.05-1.17 MPa, then the mixed hydrogen natural gas is conveyed by using a natural gas pipeline and is conveyed to a demand end equipment;

[0027] The hydrogenated natural gas is received by the circulating adsorption tower in the demand end equipment, the circulating adsorption tower is provided with a powder spraying device at the top, the powder spraying device is provided with a feeding hopper, the hydrogen absorption magnesium powder prepared in step three is placed in the feeding hopper, a blower is arranged at the bottom of the circulating adsorption tower, the height of the circulating adsorption tower is 18 m, and the bottom of the circulating adsorption tower is provided with a magnesium powder recovery device, the magnesium powder recovery device is connected with the powder spraying device in a circulation mode, and the top of the circulating adsorption tower is provided with a natural gas conveying pipeline for conveying the separated natural gas.

[0028] In step six, the hydrogenated natural gas enters from the bottom of the circulating adsorption tower, the powder spraying device sprays the hydrogen absorption magnesium powder into the circulating adsorption tower, a blower is arranged at the bottom to blow upward, so that the hydrogen absorption magnesium powder is fully mixed with hydrogen to form MgH2 through an adsorption chemical reaction, then under the condition that the temperature is above 100℃, 2.68wt% of hydrogen can be absorbed in 600s, graphene loaded with Sc2O3 is blown downward from the top of the tower, the MgH2 is fully catalyzed, then the blower is turned to blow, so that the hydrogen absorption magnesium powder floats and is conveyed to the front end of the supply terminal, a hydrogen release device is arranged at the front end of the supply terminal, the working temperature of the hydrogen release device is set to be above 300℃, under this condition, 6.65wt% of hydrogen is released from the MgH2 in 30min, and finally the released hydrogen is transported to the supply terminal.

[0029] In step six, the hydrogenated natural gas enters from the bottom of the circulating adsorption tower, the powder spraying device sprays the hydrogen absorption magnesium powder into the circulating adsorption tower, a blower is arranged at the bottom to blow upward, so that the hydrogen absorption magnesium powder is fully mixed with hydrogen to form MgH2 through an adsorption chemical reaction, then under the condition that the temperature is above 100℃, 2.68wt% of hydrogen can be absorbed in 600s, graphene loaded with Sc2O3 is blown downward from the top of the tower, the MgH2 is fully catalyzed, then the blower is turned to blow, so that the hydrogen absorption magnesium powder floats and is conveyed to the front end of the supply terminal, a hydrogen release device is arranged at the front end of the supply terminal, the working temperature of the hydrogen release device is set to be above 300℃, under this condition, 6.65wt% of hydrogen is released from the MgH2 in 30min, and finally the released hydrogen is transported to the supply terminal.

[0030] Based on the above, the application has the advantages that: the application removes the residual oxide layer on the surface of the magnesium powder by continuously flushing the magnesium powder raw material with a hydrochloric acid solution, avoids the residual oxide layer on the surface of the magnesium powder from hindering the hydrogen adhesion process during extraction, and thus guarantees the adsorption effect of the magnesium powder; the application improves the amorphization degree and capacity retention rate of the magnesium powder by performing rapid quenching treatment on the magnesium powder in a vacuum furnace and through a circulation operation, the preparation process is simple, the preparation process difficulty of the separation reagent is reduced, and thus the practicability of the method is improved; the application adds platinum powder to the magnesium powder during ball milling to perform catalytic treatment on the magnesium powder, reduces the hydrogen bond reaction between particles in the prepared hydrogen-absorbing magnesium powder, improves the adsorption activity of the adsorption sites on the surface layer, speeds up the diffusion speed of hydrogen particles, and improves the hydrogen extraction efficiency.

[0031] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the application can be implemented in other particular forms without departing from the spirit or essential characteristics of the application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and it is therefore intended that all changes and modifications that come within the meaning and range of equivalency of the claims are resolvable thereunder. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A method for extracting hydrogen from a light Mg powder by mixing hydrogen in a natural gas pipe, comprising the steps of: The step one is magnesium powder treatment; the step two is rapid quenching treatment; the step three is catalytic addition; the step four is hydrogen mixed delivery; the step five is environment arrangement; the step six is hydrogen extraction; characterized in that: In the step one, the magnesium powder raw material is placed in a treatment tank, then continuously washed with hydrochloric acid solution, then soaked and filtered in a filter tank with distilled water, and then dried in an oven, and the impurity-removed magnesium powder is obtained after drying treatment and is ready for use; In the step two, the impurity-removed magnesium powder obtained in the step one is placed in a vacuum furnace, then nickel powder is added into the vacuum furnace, then the temperature of the vacuum furnace is increased to melt the raw material in the furnace, and then rapid quenching treatment is carried out in the vacuum furnace, and the amorphous magnesium powder is obtained after repeated operation and is ready for use; In the step three, the amorphous magnesium powder obtained in the step two is placed in a ball mill, then platinum powder is added to the amorphous magnesium powder, and then ball milling treatment is carried out in the ball mill, and the hydrogen-absorbing magnesium powder is obtained after ball milling treatment and is ready for use; In the step four, hydrogen is mixed in natural gas to form hydrogen mixed natural gas by using a gas mixing device, and then the hydrogen mixed natural gas is delivered to the demand end equipment by using a natural gas pipeline; In the step five, the hydrogen mixed natural gas is received by a circulating adsorption tower in the demand end equipment, the top of the circulating adsorption tower is provided with a powder spraying equipment, the feed hopper of the powder spraying equipment is placed with the hydrogen-absorbing magnesium powder prepared in the step three, and the bottom of the circulating adsorption tower is provided with a blower; In the step six, the hydrogen mixed natural gas enters from the bottom of the circulating adsorption tower, the powder spraying equipment sprays the hydrogen-absorbing magnesium powder into the circulating adsorption tower, the blower at the bottom blows upward to make the hydrogen-absorbing magnesium powder fully mix with hydrogen to form MgH2 by adsorption chemical reaction, then graphene loaded Sc2O3 or graphene loaded TiO2 is blown downward from the top of the tower under the condition that the temperature is above 100℃ to fully catalyze the MgH2, then the blower is turned to blow the hydrogen-absorbing magnesium powder to float and deliver to the front end of the supply terminal, the hydrogen release equipment is arranged at the front end of the supply terminal, the working temperature of the hydrogen release equipment is set to be above 300℃, under this condition, the MgH2 releases hydrogen, and finally the released hydrogen is transported to the supply terminal.

2. The method according to claim 1, wherein the method is characterized by: In the step one, the molar concentration of the hydrochloric acid solution used for continuous washing is 0.3mol / L, the continuous washing time is 10-15min, the temperature in the oven during drying treatment is 40-43℃, the drying treatment time is 100-120min, and helium is continuously introduced into the oven during the drying treatment process.

3. The method according to claim 1, wherein the method is characterized by: In the step two, the addition amount of nickel powder is 30%-35% of the mass of the impurity-removed magnesium powder, the temperature in the vacuum furnace during raw material melting is 1450-1500℃, the quenching speed during rapid quenching treatment is 30-32m / s, and the number of repeated operations is 20-25 times.

4. The method according to claim 1, wherein the method is characterized by: In the step three, the addition amount of platinum powder is 0.8%-1% of the mass of the amorphous magnesium powder, the feed particle size during ball milling treatment is 0.2-0.3mm, the rotation speed of the millstone of the ball mill during ball milling treatment is 500-780r / min, and the temperature in the ball mill during ball milling treatment is 65-68℃.

5. The method according to claim 1, wherein the method is characterized by: In the fourth step, the hydrogen gas is added in an amount of 1% to 3% of the volume of the natural gas, and the hydrogen pressure of the mixed hydrogen natural gas is 1.05 to 1.17 MPa.

6. The method according to claim 1, wherein the method is characterized by: In the fifth step, the height of the circulating adsorption tower is 18 m, and the bottom of the circulating adsorption tower is provided with a magnesium powder recovery device, the magnesium powder recovery device is circularly connected with the powder spraying equipment, and the top of the circulating adsorption tower is provided with a natural gas conveying pipeline for conveying the separated natural gas.

7. The method according to claim 1, wherein the method is characterized by: In the sixth step, the temperature in the circulating adsorption tower during hydrogen extraction is 300-350°C, and the processing rate of the circulating adsorption tower is 135-180 m 3 / h.

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