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CN-121988163-A - Microbubble reinforced waste alkali liquor regeneration system

CN121988163ACN 121988163 ACN121988163 ACN 121988163ACN-121988163-A

Abstract

The invention belongs to the technical field of liquefied gas desulfurization, and particularly relates to a microbubble reinforced waste lye regeneration system, which comprises a microbubble generator, wherein the microbubble generator is communicated with an air inlet pipe and a liquid inlet pipe, the microbubble generator is also communicated with a regeneration tower, a catalyst bed assembly is fixed in the regeneration tower, a gas-liquid separator is also fixed in the regeneration tower above the catalyst bed assembly, a first gas outlet pipeline is arranged at the top of the regeneration tower, a discharge pipeline is also communicated with the side wall of the regeneration tower between the gas-liquid separator and the catalyst bed assembly, the discharge pipeline is connected with a separation tank, and a regenerated lye pipeline is also arranged on the side wall of the separation tank. The microbubble reinforced waste alkali liquid regeneration system solves the problems that the catalyst reaction is insufficient, the separation speed is low, the rising has resistance, and the catalyst bed is severely rocked due to the sudden release of the aggregated large bubbles in the catalyst bed.

Inventors

  • XIAO XIANGQUN
  • HUANG MENGQI
  • HE QINGSHENG
  • Fan Jingxuan
  • YUAN SHAOYU
  • LI YOUCHEN

Assignees

  • 中国石油化工股份有限公司
  • 中石化炼化工程（集团）股份有限公司

Dates

Publication Date
20260508
Application Date
20241107

Claims (10)

  1. 1. The microbubble strengthening waste lye regeneration system comprises a microbubble generator (7), and is characterized in that the microbubble generator (7) is communicated with an air inlet pipe (9) and a liquid inlet pipe (10), a sulfur-poor antistretch solvent pipeline (13) is connected to the liquid inlet pipe (10), the microbubble generator (7) is also communicated with a regeneration tower (1), a catalyst bed assembly (3) is fixed in the regeneration tower (1), a gas-liquid separator (6) is also fixed in the regeneration tower (1) above the catalyst bed assembly (3), a first gas outlet pipeline (18) is arranged at the top of the regeneration tower (1), a discharge pipeline (14) is also communicated to the side wall of the regeneration tower (1) between the gas-liquid separator (6) and the catalyst bed assembly (3), a separation tank (8) is connected to the discharge pipeline (14), a second gas outlet pipeline (19) is arranged at the top of the separation tank (8), and a regeneration lye (15) and a second antistretch solvent pipeline (17) are also arranged on the side wall of the separation tank (8). The catalyst bed layer assembly (3) comprises a first catalyst bed layer (31) and a second catalyst bed layer (32), wherein the first catalyst bed layer (31) is positioned below the second catalyst bed layer (32), a plurality of gas release pipes (5) are vertically arranged in the first catalyst bed layer (31) and the second catalyst bed layer (32), the gas release pipes (5) are hollow pipes, and a plurality of gas release ports (51) are formed in the side walls of the gas release pipes (5).
  2. 2. The microbubble-reinforced alkali lye regeneration system as set forth in claim 1, wherein the first catalyst bed (31) has a first catalyst interception grating (41) on its upper surface and a first catalyst support grating (21) on its lower surface, the second catalyst bed (32) has a second catalyst interception grating (42) on its upper surface and a second catalyst support grating (22) on its lower surface, one end of a gas release tube (5) located in the first catalyst bed (31) is located in the first catalyst bed (31) and the other end extends out of the first catalyst interception grating (41), one end of a gas release tube (5) located in the second catalyst bed (32) is located in the second catalyst bed (32) and the other end extends out of the second catalyst interception grating (42).
  3. 3. The microbubble-reinforced lye regeneration system as set forth in claim 2, wherein the microbubble generator (7) is in communication with the regeneration tower (1) through a first feed line (11) and a second feed line (12), the first feed line (11) and the second feed line (12) are both in tangential communication with the regeneration tower (1), the first feed line (11) feed inlet is located between the first catalyst support grid (21) and the second catalyst interception grid (42), and the second feed line (12) feed inlet is located below the second catalyst support grid (22).
  4. 4. A microbubble enhanced lye regeneration system according to claim 2, wherein the outlet of the discharging pipeline (14) is positioned between the gas-liquid separator (6) and the second catalyst interception grid (42), a first sulfur-rich antistretch solvent pipeline (16) is further connected between the gas-liquid separator (6) and the second catalyst interception grid (42), and the outlets of the first sulfur-rich antistretch solvent pipeline (16) and the second sulfur-rich antistretch solvent pipeline (17) are both communicated with the sulfur-poor antistretch solvent pipeline (13).
  5. 5. The microbubble-reinforced alkali lye regeneration system as set forth in claim 1, wherein the first catalyst bed (31) and the second catalyst bed (32) are both formed by mixing a polyhedral hollow spherical ceramic Raschig ring with a catalyst, and the volume ratio of the polyhedral hollow spherical ceramic Raschig ring to the catalyst is 1:2-3.
  6. 6. A microbubble reinforced alkali lye regeneration system as set forth in claim 2, wherein 5 mesh coarse mesh, 20 mesh fine mesh and inert porcelain balls are sequentially laid between the first catalyst support grid (21) and the first catalyst bed (31) and between the second catalyst support grid (22) and the second catalyst bed (32) from bottom to top, and the diameter of the inert porcelain balls is 6mm.
  7. 7. The microbubble-enhanced lye regeneration system as set forth in claim 1, wherein the gas release tube (5) is made of stainless steel.
  8. 8. The microbubble-reinforced lye regeneration system as set forth in claim 3, wherein the flow ratio of the first feed line (11) to the second feed line (12) is 2:1, the gas-liquid volume ratio of the microbubble generator (7) is 1:9, the pressure of the microbubble generator (7) is 0.4-0.5 mpa, and the temperature in the regeneration tower (1) is 40-60 ℃.
  9. 9. The microbubble-enhanced lye regeneration system as set forth in claim 5, wherein the catalyst in the first catalyst bed (31) and the second catalyst bed (32) is activated carbon-supported sulfonated cobalt phthalocyanine.
  10. 10. The microbubble reinforced alkali lye regeneration system as set forth in claim 1, wherein the air inlet pipe (9) has an air filtering net, the liquid inlet pipe (10) has a Y-type filter, and the discharge pipe (14) has a Y-type filter.

Description

Microbubble reinforced waste alkali liquor regeneration system Technical Field The invention belongs to the technical field of liquefied gas desulfurization, and particularly relates to a microbubble reinforced waste alkali liquid regeneration system. Background Liquefied gas is used as a basic raw material for oil refining and chemical industry, and is widely applied to upgrading of oil quality and production of high added value products. However, since unrefined liquefied gas contains a large amount of sulfur-containing substances, it cannot be further processed industrially and used daily, and therefore the sulfur content thereof needs to be strictly controlled. The desulfurization of liquefied gas mainly comprises two processes of removing hydrogen sulfide and removing mercaptan, wherein alkali washing and mercaptan removal are widely used in the oil refining industry, sodium hydroxide and mercaptan react to generate sodium mercaptide in the alkali washing process, and mercaptan is transferred into a water phase from the liquefied gas, so that mercaptan removal is completed. The reacted waste alkali liquor is regenerated by an air oxidation method, and under the action of a sulfonated cobalt phthalocyanine or cobalt polymocyanine catalyst, oxygen in the air reacts with sodium mercaptide in the waste alkali liquor to generate disulfide and sodium hydroxide, so that the regeneration of the alkali liquor is completed. The existing alkali liquor regeneration device has the problems of low regeneration efficiency, long disulfide separation time and poor separation effect in operation, enterprises can only frequently replace new alkali, and discharge a large amount of waste alkali to realize deep desulfurization, so that most enterprises face to purchase new alkali, economic pressure and environmental protection caused by treating the waste alkali, and the cleanliness level of the enterprises is seriously affected. Chinese patent application CN112745958B discloses a sweetening alkali liquor regeneration device, a liquefied gas sweetening system and an alkali liquor regeneration method, the sweetening alkali liquor regeneration device comprises an alkali liquor regeneration tower, the alkali liquor regeneration tower comprises a tower body provided with a feed inlet for the reaction liquid containing oxidizing gas and sweetening alkali liquor to be regenerated, an exhaust outlet for discharging gas and a liquid outlet for discharging regenerated alkali liquor, a catalyst bed layer arranged in the tower body and capable of allowing the reaction liquid to pass through, and a separation component arranged in the tower body and positioned at the downstream of the catalyst bed layer along the flow direction of the alkali liquor, wherein the catalyst bed layer is provided with a catalyst capable of promoting the oxidation reaction of the reaction liquid to generate disulfide and alkali liquor, and the separation component is arranged to separate the disulfide from the alkali liquor. The device for regenerating the sweetening alkali liquor can separate disulfide generated by oxidation from the alkali liquor well during regeneration. According to the patent, disulfide generated by oxidation in regeneration can be well separated from alkali liquor in alkali liquor regeneration, but when the feed liquor passes through the catalyst bed, the bottom of the catalyst bed is easy to compact due to rising of reaction materials, so that the feed liquor moves upwards unevenly, dead zones can be formed, the catalyst reaction is insufficient, the separation speed is low, and the rising has resistance, so that the problem that large bubbles are suddenly released after being coalesced in the regeneration process of the alkali liquor of the catalyst bed, and the catalyst bed shakes violently is solved. Disclosure of Invention Based on the technical problems in the background art, the invention provides a microbubble reinforced alkali liquor regeneration system, which solves the problems that the catalyst reaction is insufficient, the separation speed is slow, and the catalyst bed is suddenly released after large bubbles in the catalyst bed are gathered and the catalyst bed is severely rocked due to the rising resistance in the waste alkali liquor regeneration process by arranging a gas release pipe in the system and arranging a catalyst bed. In order to achieve the above object, the present invention provides the following technical solutions: The microbubble strengthening waste lye regeneration system comprises a microbubble generator, wherein the microbubble generator is communicated with an air inlet pipe and a liquid inlet pipe, a sulfur-poor reverse extraction solvent pipeline is connected to the liquid inlet pipe, the microbubble generator is also communicated with a regeneration tower, a catalyst bed assembly is fixed in the regeneration tower, a gas-liquid separator is also fixed in the regeneration tower above the catalyst b