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CN-224212411-U - Conversion device for improving sulfuric dioxide to prepare acid

CN224212411UCN 224212411 UCN224212411 UCN 224212411UCN-224212411-U

Abstract

The utility model discloses a conversion device for improving the acid production of sulfur dioxide, which comprises a conversion tower, wherein a preheating catalytic section, an I catalytic section, a II catalytic section, a III catalytic section and an IV catalytic section are sequentially arranged in the conversion tower from top to bottom, an air outlet of the preheating catalytic section is connected with an inlet of a preheating absorption tower through a pipeline, an outlet of the preheating absorption tower is connected with an air inlet of the I catalytic section through a pipeline, an air outlet of the III catalytic section is connected with an inlet of an absorption tower through a pipeline, an outlet of the absorption tower is connected with an air inlet of the IV catalytic section through a pipeline, and an air outlet of the IV catalytic section is connected with two absorption towers through a pipeline. According to the utility model, the outlet of the preheating catalytic section is led to be connected with an additional absorption tower on the basis of the original converter, SO that SO 3 converted by the preheating catalytic section is firstly pre-absorbed once, SO that the concentration of SO 2 in flue gas entering the I catalytic section can be reduced to 8.5%, the oxygen-sulfur ratio of the flue gas is increased, the improvement of the secondary conversion rate is facilitated, and the overall conversion rate is improved.

Inventors

  • LIU SONG
  • LIU FANXIANG

Assignees

  • 什邡鑫时代环保科技有限公司

Dates

Publication Date
20260508
Application Date
20250604

Claims (10)

  1. 1. The conversion device for improving the acid production of sulfur dioxide comprises a conversion tower, wherein a preheating catalytic section (1), an I catalytic section (2), a II catalytic section (3), a III catalytic section (4) and an IV catalytic section (5) are sequentially arranged in the conversion tower from top to bottom, The air outlet of the preheating catalytic section (1) is connected with the inlet of the preheating absorption tower (6) through a pipeline; the outlet of the preheating absorption tower (6) is connected with the air inlet of the I catalytic section (2) through a pipeline; The air outlet of the III catalytic section (4) is connected with the inlet of an absorption tower (7) through a pipeline; The outlet of the absorption tower (7) is connected with the air inlet of the IV catalytic section (5) through a pipeline; the air outlet of the IV catalysis section (5) is connected with the two absorption towers (8) through a pipeline.
  2. 2. The conversion device for improving the acid production of sulfur dioxide according to claim 1, wherein a preheating cold-heat exchanger (9) is arranged between the preheating catalytic section (1) and the preheating absorption tower (6) and is used for cooling the gas discharged from the gas outlet of the preheating catalytic section (1) after primary conversion to the absorption temperature of the preheating absorption tower (6).
  3. 3. The conversion device for improving the acid production of sulfur dioxide according to claim 2, wherein the gas discharged from the outlet of the preheating absorption tower (6) after primary absorption is heated to the conversion temperature required by the I catalytic section (2) through the preheating cold-heat exchanger (9).
  4. 4. The conversion device for improving the acid production of sulfur dioxide according to claim 1, wherein the air outlet of the I catalytic section (2) is connected with the air inlet of the II catalytic section (3) through an I heat exchanger (10).
  5. 5. The conversion device for improving the acid production of sulfur dioxide according to claim 1, wherein the gas outlet of the II catalytic section (3) is connected with the gas inlet of the III catalytic section (4) through a II heat exchanger (11).
  6. 6. The conversion device for improving the acid production of sulfur dioxide according to claim 1, wherein a III cold-heat exchanger (12) is arranged between the air outlet of the III catalytic section (4) and an absorption tower (7) and is used for cooling the secondarily converted gas discharged from the air outlet of the III catalytic section (4) to the absorption temperature of the absorption tower (7).
  7. 7. The conversion device for improving the acid production of sulfur dioxide according to claim 5, wherein an IV cold-heat exchanger (13) is arranged between the gas outlet of the IV catalytic section (5) and the secondary absorption tower (8) and is used for cooling the gas discharged from the gas outlet of the IV catalytic section (5) after three times of conversion to the absorption temperature of the secondary absorption tower (8).
  8. 8. The conversion device for improving the acid production of sulfur dioxide according to claim 7, wherein the gas discharged from the outlet of an absorption tower (7) after secondary absorption sequentially passes through an IV cold heat exchanger (13) and an II hot heat exchanger (11) to be heated to the conversion temperature required by an IV catalytic section (5).
  9. 9. The conversion device for improving the acid production of sulfur dioxide according to claim 8, wherein the gas discharged from the outlet of an absorption tower (7) after secondary absorption is further heated to the conversion temperature required by the IV catalytic section (5) by an electric heating device.
  10. 10. The conversion equipment for raising the yield of sulfuric acid from sulfur dioxide according to claim 7, wherein the air inlet at the top of the conversion tower is connected with the drying tower through a pipeline.

Description

Conversion device for improving sulfuric dioxide to prepare acid Technical Field The utility model relates to the technical field of flue gas acid production, in particular to a conversion device for improving sulfur dioxide acid production. Background At present, the content of sulfur dioxide in raw material copper smelting flue gas adopted in flue gas acid production is about 15%, so that the content of sulfur dioxide in flue gas is still up to 14% when the flue gas enters a first-stage catalyst inlet of a converter, and the content of oxygen in the flue gas is only about 13%, so that the ratio of oxygen to sulfur is lower than that of the flue gas by only 1:1, the conversion efficiency of the subsequent sulfur dioxide is low, and the productivity and the production efficiency are influenced. In view of this, the present application has been made. Disclosure of utility model The technical problem to be solved by the utility model is that the content of sulfur dioxide is up to 14% when flue gas enters a first section inlet of a converter, SO that the oxygen-sulfur ratio is lower and is only 1:1, the conversion efficiency of sulfur dioxide is low, the productivity and the production efficiency are affected, and the utility model aims to provide a conversion device for improving the acid production of sulfur dioxide. The utility model is realized by the following technical scheme: the conversion device for improving the acid production of the sulfur dioxide comprises a conversion tower, wherein a preheating catalysis section, an I catalysis section, an II catalysis section, a III catalysis section and an IV catalysis section are sequentially arranged in the conversion tower from top to bottom, The gas outlet of the preheating catalytic section is connected with the inlet of the preheating absorption tower through a pipeline; The outlet of the preheating absorption tower is connected with the air inlet of the I catalytic section through a pipeline; The gas outlet of the III catalytic section is connected with the inlet of an absorption tower through a pipeline; the outlet of the absorption tower is connected with the air inlet of the IV catalytic section through a pipeline; The gas outlet of the IV catalytic section is connected with the two absorption towers through a pipeline. According to the utility model, the outlet of the preheating catalytic section is led to be connected with an additional absorption tower on the basis of the original converter, SO that SO 3 converted by the preheating catalytic section is firstly pre-absorbed once, SO that the concentration of SO 2 in flue gas entering the I catalytic section can be reduced to 8.5%, the oxygen-sulfur ratio of the flue gas reaches 1.3:1, the improvement of the secondary conversion rate is facilitated, and the overall conversion rate is improved. At present, the existing converter only performs two times of absorption, namely, the flue gas sequentially passes through a preheating catalytic section, an I catalytic section, an II catalytic section and an III catalytic section to be converted and then enters an absorption tower, the flue gas returns to an IV catalytic section after being absorbed, and the flue gas enters an absorption tower after being converted, namely, the flue gas enters a five-section twice-conversion twice-absorption 4+1 technology adopted by the converter, SO that the conversion efficiency is low because the concentration of SO 2 in the flue gas entering the I catalytic section is high. According to the utility model, the flue gas after being led out from the preheating catalytic section is added with primary pre-absorption, the pre-absorbed flue gas is converted by the I catalytic section, the II catalytic section and the III catalytic section and then enters secondary absorption, and the secondary absorbed gas is converted by the IV catalytic section and then enters tertiary absorption, so that a five-section tertiary conversion tertiary absorption 1+3+1 process is formed, the oxygen-sulfur ratio in the flue gas entering the I catalytic section is greatly increased, and the subsequent secondary and tertiary absorption is facilitated. In a specific embodiment, a preheating cold-heat exchanger is arranged between the preheating catalytic section and the preheating absorption tower and used for cooling the gas which is discharged from the gas outlet of the preheating catalytic section and is subjected to primary conversion to the absorption temperature of the preheating absorption tower. In a specific embodiment, the gas discharged from the outlet of the preheating absorption tower after primary absorption is heated to the conversion temperature required by the I catalytic section through the preheating cold-heat exchanger. The preheating cold-heat exchanger is arranged, so that the low-temperature flue gas discharged from the preheating catalytic section and subjected to primary conversion can be utilized to cool, and the high-tempe