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Full conversion process for high-concentration carbon monoxide

A carbon monoxide, high-concentration technology, applied in the chemical industry, inorganic chemistry, bulk chemical production, etc., can solve the problems of hidden safety hazards, large land occupation, and difficult operation, and reduce investment and operation difficulty, investment and operation. Low-cost, wide-ranging effects

Active Publication Date: 2019-11-26
SINOPEC NINGBO ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process has the following problems: ① energy consumption is high, and the added steam must be recovered in the form of condensate through water cooling in the downstream, which increases the investment of low-grade heat recovery
②The process setup is relatively long, usually it is necessary to set up three to four stages of transformation process including the pre-conversion furnace, and the investment is relatively high
④ The catalyst operates under harsh conditions of high temperature and high water-gas ratio, and its service life is short
This process saves steam and avoids the overheating of the second shift furnace, but it also has the following problems: the reaction conditions of the first shift furnace are harsh, which affects the service life of the catalyst, and the steam consumption is still high; The catalyst loading amount of a shift furnace is relatively high, the reaction driving force is large, and it is easy to cause overheating. Therefore, it is necessary to strictly control the ratio of the split gas volume, and the operation is difficult
However, this process also has the following problems: ①The water-gas ratio and carbon monoxide content of the crude synthesis gas produced by the chilled pulverized coal gasification technology are relatively high, and the total gas flow through the first shift furnace can easily cause overheating, so it is not applicable
②Because of the step-by-step quenching method, the reaction depth of the first shift furnace is insufficient compared with the high water-gas ratio process, so it is usually necessary to set up four to five stages of shifting, the process is longer, the investment is higher, and the land occupation is larger
[0007]However, the currently applied isothermal shift technology has the following problems: ①The steam by-produced by the steam drum of the isothermal shift furnace is saturated steam, which cannot produce higher quality superheated steam
The conversion device is a steam surplus device. Usually, the excess steam is used by other users in the whole plant through the steam pipe network, and the temperature of the saturated steam is lowered to produce condensate, which cannot enter the pipe network.
The outlet temperature of the traditional adiabatic shift furnace is relatively high, usually above 400°C, which can be superheated for saturated steam, while the isothermal shift furnace is mostly taken away by the water circulation system due to the reaction heat, and the outlet temperature is only about 300°C, which cannot provide a superheat source. The heating furnace can be set separately or combined with other devices, which increases the complexity of the process and equipment investment
②It is difficult to adjust the temperature of the isothermal transformation furnace
If the isothermal reactor tube leaks, it will cause damage to the catalyst due to water soaking, posing a safety hazard; second, if the pressure of the by-product saturated steam is lower than the pressure of the conversion system, the above-mentioned problem of no place for overheating of the steam will occur. In order to meet the requirements of the water-air ratio of the system, a certain amount of superheated steam needs to be introduced from the outside to make up the system, which increases the investment and operating costs.

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  • Full conversion process for high-concentration carbon monoxide
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  • Full conversion process for high-concentration carbon monoxide

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] The equipment that this embodiment is used for high-concentration carbon monoxide all conversion process includes: as figure 1 As shown, gas-liquid separator 1, feed gas heater 2, detoxification tank 3, segmented axial-radial adiabatic shift reactor 4, high-pressure steam superheater 5, 1# waste heat exchanger 6, 1# controllable Isothermal shift reactor 7, 2# waste heat exchanger 8, low-pressure steam superheater 9, 2# controllable isothermal shift reactor 10, 1# adiabatic shift reactor 41, 2# adiabatic shift reactor 101, low-pressure steam generator 102.

[0033] The side of the gas-liquid separator 1 has an inlet for promoting synthesis gas, the top has a synthesis gas outlet, and the bottom has a process condensate outlet; the inlet of the feed gas heater 2 is connected to the synthesis gas from the gas-liquid separator 1, and the f...

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Abstract

The invention relates to a full conversion process for high-concentration carbon monoxide. The process provided by the invention has a short flow, a system is reliable and has small resistance, equipment has a less number and a small occupied area, and is simple to control, and the investment and operating costs are low; a segmented axial-radial shift reactor is used, so that the problems of easyover temperature and difficult temperature control caused by change of load of feed gas having a high content of carbon monoxide in a shift reaction are solved, and compared with an axial shift reactor with stratified air inflow, the segmented axial-radial shift reactor has reduced shift furnace pressure drop and a reduced diameter and height of equipment, so that the equipment investment is greatly reduced; high-pressure saturated steam produced by a controllable isothermal reactor can be superheated, so that an external superheating furnace or combination with other devices for heating is not needed, and the investment and operation difficulty are reduced; improvement of a water-gas ratio of the system can be satisfied by using a method of spraying chilled water and supplementing self-produced saturated steam, high-pressure superheated steam is not need to be introduced from outside of a boundary area, so that energy consumption is reduced; and a temperature-controllable saturated steam generating system with a control valve is arranged, so that the temperature of shift gas can be quickly and effectively adjusted.

Description

technical field [0001] The present invention relates to a whole conversion process for high-concentration carbon monoxide. Background technique [0002] The carbon monoxide conversion device has an extremely important position in the new coal chemical plant. It is the crude synthesis gas from the upstream gasification device, under the action of the catalyst, and according to the requirements of the downstream product for the hydrogen-carbon ratio, all or part of it reacts to generate hydrogen. . Different product requirements have a greater impact on the settings of the transformation process. For the production of hydrogen and synthetic ammonia, it is usually necessary to convert carbon monoxide into hydrogen as much as possible; for the production of oxo gas, such as synthetic methanol, ethylene glycol, synthetic oil, natural gas, etc., the transformation reaction depth is relatively shallow, and it needs to be converted according to the product It is required to adjust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02C01B3/16
CPCC01B3/025C01B3/16C01B2203/0288Y02P20/129Y02P20/52Y02P20/10
Inventor 王同宝傅亮闫晓洋李亢王晨王显炎
Owner SINOPEC NINGBO ENG
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