Apparatus for HCl synthesis with steam raising

Abstract

What is described is an apparatus for performance of a process for hydrogen chloride synthesis from chlorine and hydrogen or from chlorine and hydrocarbons with integrated heat recovery, wherein the combustion chamber and the heat exchanger are arranged in the steam drum of a shell boiler which works according to the waste heat boiler principle.

Description

technical field [0001] The present invention relates to a plant for HCl synthesis with by-product steam raising, in which chlorine and hydrogen or chlorine and hydrocarbons are used as raw materials. HCl fractions, air or inert components may also be included in the feed if desired. A synthesis furnace and a heat exchanger to cool the reactants are integrated downstream as part of the steam generator. Background technique [0002] Shell boilers are commonly used to generate steam from fossil fuels. Furthermore, hydrocarbon-containing gases such as natural gas or hydrocarbon-containing oils such as fuel oil are mostly used as fuel. Combustion in the case of solid fuels such as hard coal has also been known for a long time. Typical combustion temperatures here are from 700°C up to about 1500°C. [0003] In the prior art, heat can be separated from the hydrogen chloride-containing flue gas by means of a steam generator, but in the case of a flame tube boiler or a water tube...

AI Technical Summary

Problems solved by technology

[0011] The design of water-tube boilers is expensive and complex (e.g. product tolerances), i.e. cost-intensive, and also has the following disadvantages:

[0013] 2. Embodiments using thermal oil as the heat transfer medium are problematic

On the one hand, uneven distribution of the oil and overheating of the pipe walls cannot be avoided here, and on the other hand, the synthesis unit has to be placed in the tank for environmental reasons

[0014] 3. Separate heat transfer loops for thermal decoupling are always less efficient than direct evaporation

[0015] 4. The prior art is characterized by insufficient thermal coupling, since the product gas HCl is only cooled to about 1000°C

Therefore, valuable heat remains unused

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