Multi-atmosphere dynamic thermogravimetric-differential thermal analyzer and application thereof in sulfur transfer performance simulation and evaluation of flue gas

Abstract

The invention discloses a multi-atmosphere dynamic thermogravimetric-differential thermal analyzer which belongs to the field of petroleum refining industry and researches application thereof in sulfur transfer performance simulation and evaluation of flue gas. The analyzer comprises a protection gas circuit, a multigroup reaction gas circuit, a purging gas circuit, a switching valve, a test reactor, a drain port, a tail gas absorption device and an electrothermal furnace. The analyzer can blend and provide different required multicomponent mixed gas through one or a plurality of groups of gas regulating and mixing systems, switch the atmospheres in the test reactor according to requirements, simulate reaction atmospheres with complicated changes, realize dynamic in-situ testing, more particularly simulate a sulfur dioxide atmosphere and a hydrogen atmosphere (or a hydrocarbon atmosphere) under the micro positive pressure and carry out safe switching between the sulfur dioxide atmosphere and the hydrogen atmosphere (or the hydrocarbon atmosphere), record changes of the weight and the temperature of a sample in thermal treatment process at the real time under the condition of programmed temperature controlling, carry out thermogravimetric analysis and differential thermal analysis and is used for simulating and evaluating the performance of a sulfur transfer agent of catalytically-cracked flue gas.

Description

technical field [0001] The invention belongs to the field of oil refining industry, and in particular relates to a dynamic thermogravimetric-differential thermal analyzer in multiple atmospheres, which can respectively simulate multiple reaction atmospheres and flexibly switch between them, and realize online analysis at the same time, and evaluate the performance of catalytic cracking flue gas sulfur transfer agent Sulfur transfer properties. Background technique [0002] The catalytic cracking process in the field of petrochemical industry is one of the main production processes of gasoline, diesel, liquefied gas, propylene and other important energy and chemical raw materials. With the heavy and inferior quality of raw materials in recent years, the sulfur content in the raw materials has been increasing, resulting in SOx (SO 2 and SO 3 (collectively referred to as) emissions continue to increase, resulting in more serious environmental pollution. With the increasingly...

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Problems solved by technology

[0004] At present, most thermogravimetric-differential thermal analyzers have an atmosphere control system, which can control a simple atmosphere, but the gas path is simple, the switching method is monotonous, and the simulation of a complex atmosphere requires the deployment of standard gases, which is poor in flexibility and expensive. Corrosive atmosphere and flammable atmosphere are difficult to achieve long-term stability

Especially for the working environment of simulating catalytic cracking flue gas sulfur transfer agent, it is difficult to stably simulate and freely switch between sulfur dioxide oxidation atmosphere and hydrogen atmosphere (or hydrocarbon atmosphere)

Some solutions adopt the method of standard gas to achieve the purpose of stabilizing the simulated atmosphere, but if it is necessary to simulate a variety of complex atmospheres, multiple standard gases are required, which is difficult and expensive

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