Slurry bed reaction system and method for Fischer-Tropsch synthesis reaction

Abstract

The invention relates to the field of Fischer-Tropsch synthesis, and particularly provides a slurry bed reaction system and a method. The slurry bed reaction system comprises a slurry bed reactor, aninternal heat exchange unit and an external heat exchange unit, wherein the external heat exchange unit comprises a steam drum and a heater, the steam drum and the heater are sequentially connected inseries, the heater is communicated to the lower-portion water inlet of the internal heat exchange unit, the steam drum is communicated to the upper-portion water outlet of the internal heat exchangeunit, the internal heat exchange unit comprises heat exchange pipes, and baffles are arranged inside the part of or all of the heat exchange pipes, and are used for prolonging the residence time of aheat exchange medium in the internal heat exchange unit. With system of the present invention, the heat exchange efficiency of the heat exchange unit in the reactor can be improved, the uniform and stable temperature inside the slurry bed reactor can be ensured, and the excess heat caused by the temperature runaway can be effectively removed when the catalyst is subjected to local temperature runaway so as to ensure the yield of the target product and improve the operation safety of the device.

Description

technical field [0001] The invention relates to the field of Fischer-Tropsch synthesis, in particular to a slurry bed reaction system and a method for Fischer-Tropsch synthesis. Background technique [0002] With the continuous rise of oil prices in recent years, people pay more and more attention to the development of technologies to produce alternative oil products. Syngas is produced through coal, natural gas or other substances, and then according to the requirements of the Fischer-Tropsch synthesis catalyst for synthesis gas, through water-gas shift and synthesis The gas purification process processes the syngas, and uses the treated syngas as a raw material to produce hydrocarbons through Fischer-Tropsch synthesis, and at the same time produces oxygenated compounds, which are then processed by mature petroleum processing technology to produce high-quality, environmentally friendly oil. Taste. The development of Fischer-Tropsch synthesis technology is of great signific...

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Problems solved by technology

[0011] However, this kind of pin-fin heat exchanger has the characteristics of complicated manufacturing, and with the increase of the size of the reactor, it is necessary to increase the length and number of pin-fins on the tubes, which increases the heat transfer effect under the premise of ensuring the heat exchange effect. Manufacturing is difficult, and at the same time, the proportion of the cross-sectional area of ​​the heat exchange tubes to the cross-sectional area of ​​the reactor increases, which affects the fluid distribution inside the reactor and will lead to a decrease in the yield of the target product

[0012] In addition, the Fischer-Tropsch reaction is a strong exothermic reaction. Once the Fischer-Tropsch synthesis reactor has overheating, the heat exchanger has no measures to remove the excess heat in time, which will cause the test to fail in severe cases.

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