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Method for starting methanol synthesis tower through reverse steam guiding

A technology of methanol synthesis tower and start-up method, which is applied in the field of methanol synthesis, can solve the problems of long start-up time of methanol synthesis tower, and achieve the effect of increasing service life and increasing output

Active Publication Date: 2015-04-15
QITAIHE BAOTAILONG METHANOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem of the long start-up time of the methanol synthesis tower in the existing methanol synthesis section, and provides a start-up method for the methanol synthesis tower to guide steam backwards

Method used

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  • Method for starting methanol synthesis tower through reverse steam guiding
  • Method for starting methanol synthesis tower through reverse steam guiding
  • Method for starting methanol synthesis tower through reverse steam guiding

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Experimental program
Comparison scheme
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specific Embodiment approach 1

[0015] Specific implementation mode one: (refer to attached Figure 1~3 ) The start-up method of the methanol synthesis tower of the present embodiment is carried out according to the following steps:

[0016] 1. Drain the water in the steam drum 3, reduce the liquid level of the methanol synthesis tower 2 shell side to 60% to 70% of normal production, and transfer the low-pressure steam in the steam pipe network to the methanol synthesis tower 2 Shell side, heating the synthesis catalyst in the tube side; at the same time, the medium-pressure steam from the conversion section is also input into the shell side of the methanol synthesis tower 2 through the steam ejector; the temperature of the catalyst is increased to be consistent with the temperature of the steam; the synthesis catalyst is copper-based catalyst;

[0017] Two, the compressed synthesis gas obtained after being compressed by the compressor passes through the shell side of the gas-gas heat exchanger 5, and passe...

specific Embodiment approach 2

[0021] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, the liquid level in the shell side of the methanol synthesis tower is 60% to 70% of the height of the shell side of the methanol synthesis tower during normal production. Others are the same as the first embodiment.

specific Embodiment approach 3

[0022] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the water level in the steam drum during normal production in step 3 is 60% to 80% of the height of the steam drum. Others are the same as the first embodiment.

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Abstract

The invention discloses a method for starting a methanol synthesis tower through reverse steam guiding, relates to methods for starting methanol synthesis towers, and solves the technical problem of long starting time of an existing methanol synthesis tower for methanol synthesis section. The method comprises the following steps: arranging a backflow pipe between an outlet of a tube pass of a gas-gas heat exchanger and an inlet of a shell pass of the gas-gas heat exchanger, emptying water from a steam pocket, lowering the liquid level of a shell pass of the methanol synthesis tower, reversely guiding low-pressure steam from a steam pipe system to the methanol synthesis tower, inputting medium-pressure steam into the methanol synthesis tower at the same time, heating a synthetic catalyst, and filling compressed synthetic gas into the methanol synthesis tower for circulating; when the temperature of a synthetic gas inlet of the methanol synthesis tower reaches 175 DEG C and the temperature of a synthetic gas outlet is not less than 210 DEG C, adjusting the water level and the pressure of the steam pocket to be indexes during normal production; when the temperature of the synthetic gas inlet of the methanol synthesis tower reaches more than 220 DEG C, finishing the starting operation. According to the method, the starting time of the methanol synthesis tower is 5-6 hours.

Description

technical field [0001] The invention relates to the field of methanol synthesis, in particular to a method for starting up a methanol synthesis tower. Background technique [0002] In the methanol synthesis section, the process flow chart of methanol synthesis is as follows figure 1 Shown: The compressed synthesis gas obtained after the synthesis gas is compressed by the compressor is heated by the shell side of the gas-gas heat exchanger, and then enters the tube side of the vertical tubular fixed-bed methanol synthesis tower, reacts with the catalyst in the tube side, and releases A large amount of heat, after synthesis, is discharged from the outlet of the methanol synthesis tower and enters the tube side of the gas-gas heat exchanger to cool down, then enters the methanol water cooler for cooling, and then enters the gas-liquid separator for gas-liquid separation, and the separated gas phase returns to the compression The separated liquid phase is processed by methanol ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/04C07C29/151
CPCC07C29/1512C07C31/04
Inventor 陈建国边兴海张丽李怀建王新嘉李家兴王晓飞张宏赫长坤张福友王中兴刘军
Owner QITAIHE BAOTAILONG METHANOL