Method for preparing synthesis gas with proper hydrogen-carbon ratio by partial oxidation

Abstract

The invention discloses a method for preparing synthesis gas with proper hydrogen-carbon ratio by partial oxidation. the method is characterized in that gaseous hydrocarbon is taken as a raw material,air, oxygen-enriched air and pure oxygen are taken as oxidants, steam is taken as a gasifying agent, a non-catalytic POX (partial oxidation) furnace is adopted for generating gas, and the reaction temperature in the non-catalytic POX furnace reaches 1200-1500 DEG C; the mixed raw material is mixed with recycled product synthesis gas and is chilled, and the mixed gas is sent into a waste heat boiler and a steam superheater to produce by-product superheated steam after the temperature is reduced to 700-900 DEG C; after heat recovery, the product synthesis gas at 250-350 DEG C is first desulfurized, then adjusted to the required hydrogen-carbon ratio by all or part of non-sulfur-tolerant conversion, low-temperature heat recovery and water washing is conducted continuously, and the product synthesis gas meeting specifications is sent out of the battery limit. The invention further discloses a device for preparing the synthesis gas with proper hydrogen-carbon ratio by partial oxidation. The whole process is further optimized, operating conditions are milder, reliability of the device is further improved, the device can produce the high-value by-product superheated steam, and accordingly, the energy-saving effect and economic performance of the whole process are improved.

Description

technical field [0001] The invention relates to the production of polyurethane (TDI , MDI, PC, PE, etc.), synthetic oil, ethylene glycol, methanol and synthetic ammonia and other chemical fields, especially a kind of gasification with gaseous hydrocarbon as raw material, air, oxygen-enriched air, pure oxygen as oxidant, and steam as gasification Agent, method and device for preparing synthesis gas with suitable hydrogen-to-carbon ratio by using non-catalytic partial oxidation (POX). Background technique [0002] Syngas (CO+H 2 ) As an important chemical raw material, in the field of chemical industry, it is mainly used to prepare a series of important products such as polyurethane (TDI, MDI, PC, PE, etc.), oil, ethylene glycol, synthetic ammonia, liquid fuel, methanol, ethers and fertilizers. There is a large demand for syngas, which also leads to an industrial demand for larger capacity reformers. [0003] In the process of gaseous hydrocarbon conversion to prepare synth...

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Problems solved by technology

[0004] 1. The process gas temperature at the outlet of the reformer is as high as 1200-1500°C, and the operating conditions of the synthesis gas outlet pipeline and the directly connected waste boiler are harsh, resulting in a very complicated equipment structure

[0005] 2. In order to prevent carbon from accumulating on the heat exchange tube wall, the waste heat boiler as the key equipment for heat recovery must use a vertical coil waste boiler, which has a complex structure, large size, and high price. It also needs a circulating water pump to cool its small tube sheet, greatly Increased operational complexity and production expense

[0006] 3. Due to the structural limitations of the vertical coil waste heat boiler itself, the outlet temperature of the process gas cannot be flexibly adjusted and controlled. Therefore, the traditional non-catalytic partial oxidation technology can only produce saturated steam by-product, and cannot be superheated and used as power steam

[0007] 4. Because the non-catalytic partial oxidation process may generate a small amount of carbon black during the production process, it is difficult to operate the device when it is running at low load, and the operating flexibility of the device is poor

[0008] 5. The gas-hydrogen-carbon ratio of traditional non-catalytic partial oxidation products that use natural gas as raw material is around 1.7 to 1.8, which cannot be adjusted flexibly

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