CN-122006612-A - Total oxygen and negative oxygen combustion sulfur recovery system and method

CN122006612ACN 122006612 ACN122006612 ACN 122006612ACN-122006612-A

Abstract

The invention relates to the technical field of petrochemical technology, and particularly discloses a total oxygen and negative oxygen combustion sulfur recovery system and method, which are matched with a desulfurization system for use, wherein the total oxygen and negative oxygen combustion sulfur recovery system comprises a reaction system, a hydrogenation system and a tail gas negative oxygen combustion furnace, wherein the reaction system is connected with a hollow separation device of the desulfurization system; the reaction system and the air separation device are respectively connected with the tail gas negative oxygen burning furnace, the reaction system comprises a first-stage reaction furnace, a waste heat boiler, a second-stage reaction furnace and a third-stage reaction furnace which are sequentially connected, the first-stage reaction furnace is connected with the air separation device, and the air separation device conveys oxygen into the first-stage reaction furnace for full oxygen combustion. The invention can effectively reduce the discharge amount of the atmospheric pollutants SO 2 、NO x generated in the petroleum and natural gas production process, and provide solid guarantee for the quality of human living environment.

Inventors

LU DAYONG
WANG DASHENG

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. The total-oxygen and negative-oxygen combustion sulfur recovery system is matched with the desulfurization system for use, and is characterized by comprising a reaction system, a hydrogenation system and a tail gas negative-oxygen burning furnace, wherein the reaction system is connected with a hollow separation device of the desulfurization system; the reaction system comprises a primary reaction furnace, a waste heat boiler, a secondary reaction furnace and a tertiary reaction furnace which are sequentially connected, wherein the primary reaction furnace is connected with an air separation device, and the air separation device conveys oxygen into the primary reaction furnace for total oxygen combustion.
2. The sulfur recovery system of claim 1, wherein a four-stage reaction unit is further disposed between the three-stage reaction furnace and the tail gas oxygen burning furnace.
3. The sulfur recovery system of claim 2, wherein the four-stage reaction unit is a low temperature MCRC reactor.
4. The sulfur recovery system of claim 1, wherein the four-stage reaction unit is a low pressure dry desulfurization unit.
5. The total-oxygen and negative-oxygen combustion sulfur recovery system according to claim 1 is characterized in that an oxygen storage tank for storing and conveying oxygen produced by the air separation device to the primary reaction furnace is arranged between the primary reaction furnace and the air separation device, a nitrogen storage tank is arranged between the tail gas negative-oxygen burning furnace and the air separation device, and the nitrogen storage tank is connected with the tail gas negative-oxygen burning furnace through a pipeline.
6. The sulfur recovery system of total and negative oxygen combustion according to any one of claims 1 to 5, wherein an on-line analyzer for detecting the ratio of elemental sulfur to sulfur dioxide is provided at the output end of the three-stage reaction furnace.
7. The sulfur recovery system of any one of claims 1 to 5, wherein the reaction system further comprises a confluence tank connected with the primary reaction furnace, the secondary reaction furnace and the tertiary reaction furnace through pipelines respectively.
8. The sulfur recovery system of claim 7, wherein heat preservation pipes connected with the confluence tank are respectively arranged among the primary reaction furnace, the secondary reaction furnace and the tertiary reaction furnace.
9. A method of a total and negative oxygen combustion sulfur recovery system according to any one of claims 1-8, comprising the steps of: step S1, oxygen prepared by a hollow separator device in a desulfurization system enters a first-stage reaction furnace to react with hydrogen sulfide to generate elemental sulfur and sulfur dioxide steam; S2, elemental sulfur and sulfur dioxide steam enter a waste heat boiler to perform waste heat recovery to form liquid sulfur and gaseous sulfur dioxide A, wherein the liquid sulfur A enters a converging pool, and the gaseous sulfur dioxide A enters a secondary reaction furnace; Step S3, carrying out catalytic reaction on the gaseous sulfur dioxide in a secondary reaction furnace to generate liquid sulfur B and gaseous sulfur dioxide B, wherein the liquid sulfur B enters a confluence tank, and the gaseous sulfur dioxide B enters a tertiary reaction furnace; Step S4, carrying out catalytic reaction on the gaseous sulfur dioxide B in a three-stage reaction furnace to generate liquid sulfur C and tail gas A, wherein the liquid sulfur C enters a confluence pool, and the tail gas A detects whether the volume ratio of hydrogen sulfide to sulfur dioxide gas is 2:1 through an online analyzer; S5, if the volume ratio is 2:1, the tail gas A enters a tail gas negative oxygen burning furnace and a hydrogenation system to convey hydrogen into the tail gas negative oxygen burning furnace for burning and discharging; when the tail gas is burnt in the negative oxygen burning furnace, the burning temperature is 300-800 ℃ and the oxygen content is 12-15%.
10. The sulfur recovery system of claim 9, wherein if the volume ratio is not satisfactory, the tail gas a enters a four-stage reaction unit, the four-stage reaction unit performs sulfur recovery treatment, and the formed tail gas B enters a tail gas negative oxygen burning furnace and a hydrogenation system to carry out hydrogen burning and discharging in the tail gas negative oxygen burning furnace.

Description

Total oxygen and negative oxygen combustion sulfur recovery system and method Technical Field The invention relates to the technical field of petrochemical technology, in particular to a total oxygen and negative oxygen combustion sulfur recovery system and method. Background The petroleum and natural gasification industry is one of petroleum and natural gasification industry with serious pollution, and in the actual production process, atmospheric pollutants such as SO 2、NOx, dust or blackness which are difficult to avoid easily exceed standards, and serious damage can be caused to the environment and human health. Most of the existing sulfur recovery processes are claus sulfur recovery processes. The acid gas is first burned with air or oxygen in a device called a burner. The volume ratio of hydrogen sulfide to sulfur dioxide in the combustion products is 2:1 by strictly controlling the air or oxygen, and then the combustion gases are cooled, and sulfur in the gases is condensed and recovered. The residual gas is heated and then enters a Claus reactor for reaction. The reaction mainly comprises the production of sulfur and water from hydrogen sulfide and sulfur dioxide, and the reaction can be realized by using a catalyst. The reacted gas also needs to be cooled to recycle sulfur. And then the residual gas is subjected to secondary and tertiary reactions. The sulfur recovery rate of the common sulfur recovery device can reach 95-98%. The existing problems are that in the recovery of oil refining sulfur and the desulfurization recovery of sulfur-containing natural gas, the Claus method sulfur recovery technology has the advantages of simple process, small occupied area, low cost and the like compared with other sulfur recovery technologies. However, the sulfur yield can only reach 95 to 97 percent, the Skott tail gas recovery process is increased, the total sulfur yield can only reach about 98.5 percent, and the emission standard is not met. Disclosure of Invention The invention aims to solve the technical problem of providing a total oxygen and negative oxygen combustion sulfur recovery system and a method, which can reduce the emission of atmospheric pollutants SO 2、NOx generated in the petroleum and natural gas production process and provide solid guarantee for the quality of human living environment; the invention solves the technical problems by adopting the following solution: The total-oxygen and negative-oxygen combustion sulfur recovery system is matched with an air separation device in a desulfurization system, and comprises a reaction system, a hydrogenation system and a tail gas negative-oxygen burning furnace, wherein the reaction system is connected with the air separation device in the desulfurization system; the reaction system comprises a primary reaction furnace, a waste heat boiler, a secondary reaction furnace and a tertiary reaction furnace which are sequentially connected, wherein the primary reaction furnace is connected with an air separation device, and the air separation device conveys oxygen into the primary reaction furnace for total oxygen combustion. In some possible embodiments, a fourth-stage reaction unit is further arranged between the third-stage reaction furnace and the tail gas negative oxygen burning furnace. In some possible embodiments, the four-stage reaction unit is a low temperature MCRC reactor. In some possible embodiments, the four-stage reaction unit is a low pressure dry desulfurization unit. In some possible embodiments, an oxygen storage tank for storing and conveying the oxygen produced by the air separation device to the first-stage reaction furnace is arranged between the first-stage reaction furnace and the air separation device, a nitrogen storage tank is arranged between the tail gas negative oxygen burning furnace and the air separation device, and the nitrogen storage tank is connected with the tail gas negative oxygen burning furnace through a pipeline. In some possible embodiments, an online analyzer for detecting the proportion of elemental sulfur and sulfur dioxide is arranged at the output end of the three-stage reaction furnace. In some possible embodiments, the reaction system further comprises a confluence tank connected with the primary reaction furnace, the secondary reaction furnace and the tertiary reaction furnace through pipelines respectively. In some possible embodiments, heat-preserving pipes connected with the confluence tank are respectively arranged among the primary reaction furnace, the secondary reaction furnace and the tertiary reaction furnace. The method for the total oxygen and negative oxygen combustion sulfur recovery system specifically comprises the following steps: step S1, oxygen prepared by a hollow separator device in a desulfurization system enters a first-stage reaction furnace to react with hydrogen sulfide to generate elemental sulfur and sulfur dioxide steam; S2, elemental sulfur and sulfur dioxide steam enter