Waste heat boiler for preparing olefins from methanol

Abstract

The invention discloses a waste heat boiler for preparing olefins from methanol, which can meet various steam use requirements in a system for producing the olefins by the methanol. The waste heat boiler comprises a heat insulation hearth which is vertically distributed, a secondary heat exchange channel which is vertically distributed, and a main heat exchange channel which is connected with the upper end of the heat insulation hearth and the lower end of the secondary heat exchange channel; a smoke inlet is arranged at the lower end of the heat insulation hearth and a smoke outlet is arranged at the lower end of the secondary heat exchange channel; a plurality of super-heaters are arranged in the main heat exchange channel; a plurality of groups of economizers are arranged in the secondary heat exchange channel from top to bottom; the heat insulation hearth is located on the side wall above the smoke inlet and provided with a heat booster for improving a smoke temperature in the heat insulation hearth. The waste heat boiler provided by the invention has the advantages that: after the heat booster is additionally arranged on the side wall of the heat insulation hearth, the temperature of high-temperature smoke in the heat insulation hearth is raised, therefore, the temperature and the steam quantity of steam which is generated through the super-heater can be improved. The generation requirement and the most of the steam use requirements of the technology in the system for producing the olefins by the methanol can be met.

Description

technical field [0001] The invention relates to a waste heat boiler for methanol to olefin. Background technique [0002] Methanol-to-olefins technology is a new way to produce olefins from non-oil raw materials, which will greatly alleviate the dependence on petroleum resources, effectively and cleanly utilize coal resources, alleviate the situation of methanol overcapacity, extend the coal chemical industry chain, and promote coal chemical industry The sustainable and healthy development of the industry will play an important role. As an important equipment in the methanol-to-olefins (MTO) plant, the waste heat boiler is used to recover the high-temperature CO flue gas energy of the MTO plant, protect the environment, and enable the entire MTO system to operate normally. The waste heat boiler includes: a vertically arranged adiabatic furnace, a vertically arranged auxiliary heat exchange channel, and a main heat exchange channel connecting the upper end of the adiabatic f...

AI Technical Summary

Problems solved by technology

Due to the special process of methanol to olefins, the temperature of high-temperature flue gas before heat recovery is about 615°C, that is, the highest temperature in the adiabatic furnace of the above-mentioned waste heat boiler is about 615°C. After heat recovery of high-temperature flue gas, the waste heat boiler It can only supply ordinary process steam, and cannot meet the steam demand of the whole system of methanol to olefins

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