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Sulfur recovery device and method based on automatic adjustment of Claus air distribution

A sulfur recovery and automatic adjustment technology, which is applied in the direction of sulfur preparation/purification, energy input, etc., can solve the problems of auxiliary wind losing its regulating effect and the influence of sulfur recovery device operation, and achieve the effect of avoiding airflow

Inactive Publication Date: 2019-05-31
SHANDONG SUNWAY PETROCHEMICAL ENGINEERING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the existing air distribution system, since the auxiliary air flow only accounts for about 20% of the total air volume, when the acid gas concentration fluctuates greatly, the auxiliary air regulating valve is continuously opened or closed to be fully open or fully closed. When the excess condition is caused, the auxiliary air loses its regulating effect, which greatly affects the operation of the entire sulfur recovery unit

Method used

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  • Sulfur recovery device and method based on automatic adjustment of Claus air distribution
  • Sulfur recovery device and method based on automatic adjustment of Claus air distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] In this example, the high-temperature process gas in the waste heat boiler for sulfur production is cooled to 320°C, the process gas in the primary condensing cooler is cooled to 160°C, the temperature of the process gas in the steam heater is raised to 240°C, and the process gas in the process gas heat exchanger is cooled to 275°C, the process gas in the secondary condensing cooler is cooled to 160°C, the process gas in the process gas heat exchanger is heated to 220°C, and the process gas in the third condensing cooler is cooled to 160°C.

[0097] Initial acid gas H 2 S concentration 85%, initial acid gas flow 1060Nm 3 / h, based on H 2 S chemical reaction equation to calculate the main wind proportional coefficient K 0 is 2, the initial set value is calculated according to formula Ⅰ: the main air flow is 2120Nm 3 / h, range is 3000Nm 3 / h; auxiliary air flow is 100Nm 3 / h, range is 500Nm 3 / h.

[0098] After the Claus reaction, H 2 S / SO 2 Online detection inst...

Embodiment 2

[0105] The difference from Example 1 is that when the acid gas flow rate is constant but the concentration changes, the H 2 S / SO 2 Significant changes in the test results of online testing instruments, SO 2 Concentration 0.6% (mol%), H 2 The concentration of S is 0.2% (mol%); the control module calculates the change of the secondary air according to the formulas I, II, and III, and the flow of the main air is kept at 2120Nm 3 / h,Q 副风原设定值 100Nm 3 / h,Q 酸性气 1060Nm 3 / h,Q 空气 2200Nm 3 / h,C H2S is 0.002, C SO2 is 0.006; K 0 is 2, and the volume correction factor K is 0.87;

[0106] Q 副风变化值 =(Q 酸性气 +Q 空气 )×K×(C H2S -2C SO2 )×2.5=-71.34Nm 3 / h;

[0107] Q 副风新设定值 =Q 副风原设定值 +Q 副风变化值 =28.34Nm 3 / h;

[0108] The new setting value of the auxiliary wind is less than 10% of the auxiliary air range. At this time, the auxiliary air has no ability to control and continue to reduce the air supply. Therefore, keep the auxiliary air unchanged, and calculate the main wind coe...

Embodiment 3

[0116] The difference from Example 1 is that when the acid gas flow rate is constant but the concentration changes, the H 2 S / SO 2 Significant changes in the test results of online testing instruments, SO 2 Concentration 0.6% (mol%), H 2 The concentration of S is 0.2% (mol%); the control module calculates the change of the secondary air according to the formulas I, II, and III, and the flow of the main air is kept at 2120Nm 3 / h,Q 副风原设定值 100Nm 3 / h,Q 酸性气 1060Nm 3 / h,Q 空气 2200Nm 3 / h,C H2S is 0.002, C SO2 is 0.006; K 0 is 2, and the volume correction factor K is 0.87;

[0117] Q 副风变化值 =(Q 酸性气 +Q 空气 )×K×(C H2S -2C SO2 )×2.5=-71.34Nm 3 / h;

[0118] Q 副风新设定值 =Q 副风原设定值 +Q 副风变化值 =28.34Nm 3 / h;

[0119] The new setting value of the auxiliary wind is less than 10% of the auxiliary air range. At this time, the auxiliary air has no ability to control and continue to reduce the air supply. Therefore, keep the auxiliary air unchanged, and calculate the main wind coe...

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Abstract

The invention belongs to the technical field of sulfur recovery and relates to a sulfur recovery device and method based on automatic adjustment of Claus air distribution. The device comprises a combustion unit, a Claus reaction unit, an air distribution unit, a pipeline communicated with the above units according to process requirements and a valve arranged on the pipeline. According to the sulfur recovery device and the sulfur recovery method, a traditional independent main air and the auxiliary air double-loop control process is changed, and the defect is overcome that manual regulation isneeded when auxiliary air is over-regulated. When the auxiliary air is over-regulated, the change of main air flow is adjusted, the control of an air distribution system is achieved,the range of the auxiliary air flow is promoted to be in a reasonable interval while it is ensured that the proportion of H2S and SO2 at an outlet of a Claus process reactor approaches to the ideal reaction proportion.

Description

technical field [0001] The invention belongs to the technical field of sulfur recovery, and relates to a sulfur recovery device and method based on automatic adjustment of Claus air distribution. Background technique [0002] The existing acid gas sulfur recovery process, its main equipment includes a sulfur production burner along the gas flow direction, a two-stage Claus reactor, etc. A high temperature thermal reaction occurs in the combustion furnace for sulfur production, and one-third of the H in the feed gas 2 S is burned to SO 2 , two-thirds of H 2 S and generated SO 2 The Claus reaction occurs, the mixed gas leaving the combustion chamber is cooled, and then the liquid sulfur is separated, and the gas enters the two-stage Claus reactor successively to undergo the Claus catalytic reaction, which further improves the sulfur recovery rate and converts the H in the acid gas. 2 S is converted to sulfur for recovery. The instrument and control system is used througho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/04
CPCY02P20/129
Inventor 李铁军安威范志刚赵芳高炬张恒拓
Owner SHANDONG SUNWAY PETROCHEMICAL ENGINEERING CO LTD
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