Vodorodomobili alloy for hydrogen accumulators and heat pumps

 

The invention relates to a hydrogen energy, namely the alloys used in batteries, hydrogen and heat pumps. The efficiency of the heat pump, if it works in the cold, is determined by the cooling capacity, which depends on moderadamente and connected with the technological properties of low-temperature component (alloy), namely, with hysteresis, the slope of the isotherm, etc. Problem solved claimed invention is to obtain compounds of the AB5 type for low-temperature component of the heat pump, providing better cooling capacity than previously known, at pressures close to atmospheric in the field of operating temperatures. The technical result is achieved by the fact that in vodorodomobili alloy containing lanthanum and Nickel, enter mischmetall, cobalt in the following ratio, wt. %: Mm 0,01-32,4, La 0,01-32,1, Co 13,6, Ni - rest. The claimed composition of the alloy of lanthanum and Nickel with Ismatulla and cobalt battery hydrogen and low-temperature component of the heat pump provides higher specific cooling capacity (kJ/DM3) by 21% compared with Zrfor 0.9Tia 0.1Crfor 0.6Fe1,4. 4 Il.

It is known that alloys drives hydrogen (start) type AB5are promising for use in heat pumps, because they have a relatively high hydrogen capacity, specific heat of education, easily activated and low hydrogen purity in comparison with alloys of the type AB2and AB3.

Known vodorodomobili alloy type AB2composition Zrfor 0.9Tia 0.1Crfor 0.6Fe1,4for low-temperature component toplogo pump having relatively high hydrogen capacity (see "heat and mass transfer processes in metal hydride thermal energy conversion method heat waves", the dissertation on competition of a scientific degree of candidate of technical Sciences Kim Kyu-Jong, specialty 05.14.05 - theoretical fundamentals of heat, Minsk, 2000 ). The main disadvantage of metal hydrides of zirconium is low system pressure (below atmospheric in 1,5-2 times) upon transfer of hydrogen from the low-temperature (HT) alloy in high-temperature (VT) in the process of getting a cold at a temperature below 0oC. During long-term operation of the heat pump it can cause nationem from the environment and the requirements for purity hydrogen, the input to the system from outside for charging a heat pump. Impurities such as oxygen, nitrogen, water vapor, lead to the poisoning of the alloy and the loss of his health. Preliminary fine purification of hydrogen increases the cost of production of heat pumps and will require the creation of appropriate infrastructure.

Known vodorodomobili alloy LaNi5that can also be used in heat pumps (G Alefeld, I. Felkl "Hydrogen in metals", so 2. Applied aspects, S. 8, Moscow, 1981). The lack of alloy - low pressure on the plateau of the isotherm at low temperatures, which can lead to nationem into the system from the atmosphere.

The efficiency of the heat pump, if it works in the cold, is determined by the cooling capacity, which depends on moderadamente and connected with the technological properties of low-temperature component (alloy): hysteresis, the slope of the isotherm and. so on,

Task to be solved by the claimed invention is to obtain compounds of the type AB5for low-temperature component of the heat pump, providing better cooling capacity than previously known, at pressures close to atmospheric in the field of operating temperatures.

Technochemical (Mm), cobalt (Co), in the following ratio, wt.%: Mm - 001-32,4, La - 0.01-32,1, 13,6, Ni - rest.

The invention consists in a new qualitative and quantitative composition vodorodosoderzhashchego alloy type AB5based mischmetall and lanthanum Nickel and cobalt. Introduction to the composition of the alloy of mischmetall, as well as the stated quantitative characteristics ratio mischmetall and lanthanum alloy, provide a high hydrogen capacity, small hysteresis and the slope of the isotherms at pressures close to atmosfernomu in the field of operating temperatures, and high sensitivity pressure on the plateau of the isotherm to the temperature, which generally leads to an increase in the cooling capacity of the heat pump working temperature of the alloy from -15oC to +25oC.

Substantiation of the PARAMETERS Obtained vodorodomobilej alloys of the following composition, wt.%: a) Mm - 29,1, La - 3,2, Co - 13,6, Ni - rest; b) Mm - 24,3; La - 8,0; Co - 13,6, Ni - rest; in) Mm - 19,4; La - 12,8, 13,6; Ni - the rest; d) La - 32,1, Mm - 0,01, Co - 13,6, Ni - rest.

In Fig. 1 presents the results of testing of these alloys at +25oC. From Fig. 1 shows that with increase in the content of lanthanum plateau pressure hydrogen sorption decreases. In Fig. 2 depicts the average spaceplane in the alloy of lanthanum plateau pressure desorption of hydrogen decreases. The maximum hydrogen content in the alloys of the claimed composition more than 6 g-at/g-mol IC, medium pressure desorption of not more than 3.3 ATA at a temperature of -15oC. it is found Experimentally that the hysteresis of the compounds is1,2 (Fig. 3). In addition, Fig.1 and 2 show that the alloys having a composition in wt.%: Mm - 0,01-32,4, La - 0,01-32,1, 13,6, Ni - rest, have a high sensitivity pressure to temperature. This is very important when interacting with high-temperature IC during operation of the heat pump. For comparison, in Fig.4 shows the isotherms of adsorption and desorption of alloy Zrfor 0.9Tia 0.1CRfor 0.6Fe1,4at a temperature of 30oWith the 60oC. the Alloy has a larger hysteresis1.6 and less pressure sensitivity to temperature. In the claimed range of compositions of alloy Mm-La-Ni-Co is useful to distinguish compounds with Mm 19,4 is 29.1 wt.%, La - 3,2-12.8 wt.%, With of 13.6 wt.%, Ni - rest, in which the average pressure sorption-desorption in the temperature range close to atmospheric (average pressure desorption at -15oIs from 1,42 up to 3,30 ATA), and the maximum content of hydrogen in compounds is from 6 to 6.7 g-at/g-mol IC. These concentrations correspond PR is the number of leads to the formation of a new phase And2In7and lowering them to appear in the structure phase of Nickel and cobalt. Increase or decrease in the alloy of cobalt leads to lower equilibrium pressure on the plateau of the isotherm, reduction of hysteresis and moderadamente alloys, which affects the cooling capacity of the heat pump.

An example of a SPECIFIC IMPLEMENTATION of the Alloys of the claimed composition was obtained by fusion of the components of the charge in electric arc furnaces with a non-consumable electrode in an argon atmosphere. Crystallization of alloys, due to the specific design of equipment, is carried out in the same water-cooled copper molds, and their fusion. After several refining furnace was opened, the ingots were crushed in a jaw crusher and subjected to separation to obtain a material particle size is not more than 3.0 mm, in order To obtain alloys used mischmetall brand MCGS lanthanum brand L-0, the Nickel brand H-4, cobalt brand K-0. When calculating application rates, number of REM were taken with a 3% surplus. Thus, to obtain an ingot of composition.

The results are given in Fig. 1-3.

Thus, the claimed composition of the alloy of lanthanum and Nickel with Ismatulla and cobalt battery hydrogen and low-temperature component of the heat pump sub>CRfor 0.6Fe1,4.

Claims

Vodorodomobili alloy for hydrogen battery and a low-temperature component of the heat pump containing lanthanum and Nickel, characterized in that it further comprises mischmetall and cobalt in the following ratio, wt.%: Mischmetall - 0,01-32,4 Lanthanum - 0,01-32,1
Cobalt - 13,6
Nickel - Ostalnoe

 

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3 cl, 2 tbl, 3 ex

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