The invention discloses a FLiNaK fused salt and a preparation method, a reactor and a preparation device thereof. The contents of oxygen, sulfur, chlorine, silicon, nickel, iron, calcium, aluminum, barium, chromium, cobalt, cadmium, manganese, magnesium, copper, phosphorus, lead, zinc, vanadium, titanium, molybdenum, tungsten, zirconium, strontium, and stannum in the FLiNaK fused salt is lower than 0.01%, and the total content of impurity elements is not more than 0.1%; and the mass ratio of LiF, NaF and KF is 29.3:11.7:59.0. The preparation method includes mixing and drying; (2) heating and melting; (3) performing bubbling treatment with hydrogen for more than 8 hours at the temperature of 500-600 DEG C; (4) performing the bubbling treatment on the mixture gas of hydrogen fluoride and hydrogen with the ratio of 1:(4-9) for more than 36 hours at the temperature of 500-550 DEG C; and (5) performing retreatment with hydrogen. The FLiNaK fused salt has excellent material compatibility with Hastelloy N, GH3535 and SUS316Ti alloy.

FLiNaK fused salt and preparation method, reactor and preparation device thereof

The invention relates to an isothermal reactor, and a device and a method which are used for methanation reaction using the isothermal reactor. The isothermal reactor comprises an external cylinder body, an internal cylinder body, a plurality of heat exchange tubes, a catalyst filling plate, a raw material gas inlet pipe, a raw material gas outlet pipe, a water vapor inlet pipe, and a water vaporoutlet pipe; a lower separating plate is arranged in the external cylinder body horizontally; the internal cylinder body is arranged on the upper part of the lower separating plate; an upper separating plate is arranged in the internal cylinder body horizontally; a sealed catalytic reaction chamber is composed by the upper separating plate, the lower separating plate, and the side wall of the internal cylinder body; a sealed first chamber is composed by the upper separating plate and the top of the internal cylinder body; a sealed second chamber is composed by the lower separating plate and the bottom of the external cylinder body; and a gas channel is formed between the external cylinder body and the internal cylinder body. The isothermal reactor, and the device and the method are capableof realizing low temperature circulation-free synthesis of methane, and problems in the prior art that technology process flow is long, circulation gas amount is large, energy utilization rate is low, and reactor temperature is high in conventional methanation technology are solved.

Isothermal reactor, and device and method used for methanation reaction using isothermal reactor

The invention relates to a methanation reaction process, and is used for solving the problems that existing methanation reaction processes are complex and are long in flows, system temperatures are instable to control and catalysts are easy to inactivate. The methanation reaction process comprises the steps that the raw gas is sent to a desulfurization tank to be desulfurized after undergoing gas-liquid separation in a gas-liquid separation tank and then is sent to a feed gas heater to exchange heat with the reaction gas coming out of an isothermal reactor to be heated, the heated raw gas is sent to the isothermal reactor to react and the reaction gas after reaction is sent to the feed gas heater to exchange heat with the raw gas to be cooled and then is sent to a low-temperature adiabatic reactor to further fully react, thus obtaining the methane gas. The process has the advantages of extremely simple flow, reliability in control, low equipment investment, low operating cost, energy conservation and consumption reduction and capability of obtaining high-grade steam.

Yan Shuanghua

Papers

Methanation reaction process