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Start-up method of synthesis unit using low-pressure steam to complete 2.4mpa transformation

A technology of synthesis device and start-up method, applied in chemical instruments and methods, bulk chemical production, inorganic chemistry, etc., can solve the problems of inability to supply steam, synthetic ammonia does not have the original start-up conditions, etc.

Active Publication Date: 2016-01-06
ANHUI QUANSHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to poor communication during the installation, our company’s installers did not understand the steam system process of the neighboring company, which resulted in the inability to supply 3.0MPa steam after the completion of pipeline laying, but only 1.0MPa superheated steam, which basically determined Synthetic ammonia does not have the original driving conditions

Method used

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Embodiment 1

[0016] A start-up method of a synthetic device that utilizes low-pressure steam to complete 2.4MPa transformation, the specific process:

[0017] 1. Using steam with a pressure of 1.0MPa from a neighboring company, the work of gas generation, system inert replacement and start-up was completed.

[0018] 2. Complete the heating and vulcanization work of the conversion catalyst to make it capable of production. Then control the shift system pressure at 0.8MPa, add 1.0MPa steam to produce qualified shift gas.

[0019] 3. Complete the CO2 removal work under the pressure of 0.8MPa, and produce qualified purified gas to meet the needs of catalyst temperature rise and reduction in the alcohol alkylation system.

[0020] 4. Complete alcohol alkylation and catalyst temperature reduction.

[0021] 5. During the heating and reducing process of ammonia synthesis, due to the insufficient power of the electric furnace, try to increase the conversion pressure to about 0.9MPa, and increase ...

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Abstract

The invention discloses a synthesizer starting method completing 2.4 MPa shift by utilization of low-pressure steam, and relates to the technical field of chemical engineering. Gas making, system inert gas displacement and starting are achieved by utilization of steam having a pressure of 1.0 MPa of a neighbor company. Heating sulfuration of a shift catalytic agent is performed so as to allow the catalytic agent to have production capability. Then the pressure of a shift system is controlled to be 0.8 MPa, and prepared qualified shift gas is added by utilization of the steam having a pressure of 1.0 MPa. CO2 removing is performed under a pressure of 0.8 MPa to prepare qualified purified gas so as to meet requirements of heating reduction of catalytic agents in alcohol alkylation systems.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a start-up method of a synthesis device that utilizes low-pressure steam to complete 2.4MPa conversion. Background technique [0002] The company's 240,000-ton ammonia synthesis plant is designed as follows: fixed-bed gas production, 2.4MPa shift and variable removal process, pressure swing adsorption decarbonization, separate high and low compressors, 20.0MPa high-pressure alcohol alkylation and ammonia synthesis. Since the conversion adopts a 2.4MPa all-low variable technology, this requires the steam pressure level used in the conversion system to be higher than 2.5MPa. However, the design and installation progress of the boiler were not synchronized, and it took at least one month before it could be put into operation. Synthetic ammonia is eager to start-up production again. In order to ensure the steam supply during the start-up period, a 2.5-kilometer-long 3.0MPa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/16
CPCY02P20/129Y02P20/52
Inventor 朱有保黄晓燕周明
Owner ANHUI QUANSHENG CHEM
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