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Pre-concentrating process for high-temperature acidic gas

An acid gas and pre-extraction technology, applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of high investment, high energy consumption, poor economy, and the inability of the sulfur recovery device to operate normally for a long time. The effect of reducing floor space, reducing transportation costs, and reducing production costs

Active Publication Date: 2018-04-06
SINOPEC NINGBO ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When H in acid gas 2 When the S concentration is low, the sulfur recovery unit will not be able to operate normally for a long time
In the prior art, the H in the acid gas is increased by circulating part of the acid gas back to the upstream system. 2 S concentration, however, for some established syngas purification devices, limited by factors such as process settings and fluctuations in the sulfur content of the inlet syngas, increasing the amount of acid gas circulation can increase the concentration of H in the acid gas. 2 S concentration requires additional investment, high energy consumption, and poor economy

Method used

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  • Pre-concentrating process for high-temperature acidic gas
  • Pre-concentrating process for high-temperature acidic gas
  • Pre-concentrating process for high-temperature acidic gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 In the high-temperature acid gas pre-concentration process shown, the flow rate of the sulfur-rich absorbent from the upstream is 274954kg / h, the temperature is -55°C, and the pressure is 1.28MPaG, H 2 The molar content of S is 0.318%. After passing through the first heat exchanger 5, the second heat exchanger 4 and the lean absorbent from the thermal regeneration tower 1 in turn, the temperature is raised, and then the temperature is further raised to 110°C through the superheater 6. , and then sent to the flash tower 2 for decompression flash operation; specifically, the first heat exchanger 5 and the second heat exchanger 4 can be connected in series, and the sulfur-rich absorbent goes through the first heat exchanger 5 and the second heat exchanger The tube side of the heat exchanger 4, correspondingly, the lean absorbent goes through the shell side of the first heat exchanger 5 and the second heat exchanger 4; of course, the sulfur-rich absorbent g...

Embodiment 2

[0043] Such as figure 2 The high-temperature acid gas pre-concentration process shown comes from the upstream sulfur-rich absorbent, the flow rate is 274954kg / h, the temperature is -55°C, the pressure is 1.28MPaG, H 2 The molar content of S is 0.318%.

[0044] In this embodiment, different from Example 1, the flash tower 2 and the stripping tower 3 share the same tower body, and the tower tray 9 is used to isolate between the two, and the flash tower 2 is positioned above the stripping tower 3; The tray 9 is provided with the air riser 91 for the gas phase in the stripping tower 3 to enter the flash tower 2, and the gas riser 91 constitutes the second gas phase outlet on the top of the stripping tower 3 described in Embodiment 1. Also be provided with for the liquid phase in the flash tower 2 to enter the downcomer 92 of the stripping tower 3, this downcomer 92 has been communicated with the liquid phase outlet of the flash tower 2 and the inlet of the stripping tower 3, the...

Embodiment 3

[0057] Such as image 3 The high-temperature acid gas pre-concentration process shown comes from the upstream sulfur-rich absorbent, the flow rate is 274954kg / h, the temperature is -55°C, the pressure is 1.28MPaG, H 2 The molar content of S is 0.318%.

[0058]In this embodiment, the difference from Example 1 is that the flash tower 2, the stripping tower 3 and the thermal regeneration tower 1 share the same tower body, and the flash tower 2 and the stripping tower 3 are separated by the first head 21 , the stripping tower 3 and the thermal regeneration tower 1 are separated by the second head 31, and the flash tower 2, the stripping tower 3 and the thermal regeneration tower 1 are arranged sequentially from top to bottom; the liquid phase outlet of the flash tower 2 The inlet of the stripping tower 3 is connected through an external fluid pipeline, and the liquid phase outlet of the stripping tower 3 is connected to the inlet of the thermal regeneration tower 1 through a seco...

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Abstract

The invention relates to a pre-concentrating process for high-temperature acidic gas, which includes the steps of: a) before thermal-regeneration of a sulfur-rich absorbent, performing effective heatexchange with a barren absorbent from a thermal-regeneration column, and after heat exchange, performing further heat exchange to the sulfur-rich absorbent via an over-heater so that temperature reaches 90-140 DEG C; b) performing flashing and gas stripping so as to further desorb the gases, such as CO2, in the sulfur-rich absorbent, thereby significantly increasing the concentration of H2S and achieving pre-concentration of the acidic gas at high temperature. Before entering the concentration step, the sulfur-rich absorbent is subjected to effective heat exchange via a first heat exchanger and a second heat exchanger with the barren absorbent from the thermal-regeneration column, so that energy is effectively utilized and production cost is reduced. In the process, bypass adjustment is also provided so as to effectively control the temperature of the sulfur-rich absorbent entering a flash column, thereby ensuring that the sulfur-rich absorbent is concentrated at proper temperature atdifferent degrees. Therefore, after the thermal-regeneration, Claus gases in different concentrations are produced in order to satisfy demands in downstream sulfur recovery work sections.

Description

technical field [0001] The invention relates to the field of syngas purification, in particular to a high-temperature acid gas pre-concentration process. Background technique [0002] Syngas purification is mainly used to remove H in crude syngas 2 S, COS, CO 2 , so as to produce purified gas that meets the process requirements. The synthesis gas purification process commonly used in industry is generally divided into thermal method and cold method according to the difference of absorption temperature. Among the thermal methods, Selexol process and MDEA process are the most famous, while the cold method is represented by low-temperature methanol washing process. The low-temperature methanol washing process is a synthesis gas purification process jointly developed by Linde and Lurgi in the early 1950s. The process uses methanol as the absorption solvent, utilizes the excellent characteristics of methanol's great solubility to acid gas at low temperature, and uses physical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/14
CPCB01D53/1425B01D53/1456B01D53/1462B01D53/18
Inventor 王同宝周兴郭文萍闻靖周翔王显炎胡有元
Owner SINOPEC NINGBO ENG