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CN-118437146-B - Acid gas purifying system based on double-high-speed permanent magnet explosion-proof centrifugal compressor

CN118437146BCN 118437146 BCN118437146 BCN 118437146BCN-118437146-B

Abstract

The invention discloses an acid gas purifying system based on double high-speed permanent magnet explosion-proof centrifugal compressors, which comprises an absorption purifying system, an energy-saving flash evaporation system and a heat pump rectification regenerating system, wherein a flash evaporation tank of the energy-saving flash evaporation system is connected with a # 1 demister, an air outlet of the # 1 demister is connected with an inlet pipe of the # 1 high-speed permanent magnet explosion-proof centrifugal compressor, an outlet pipe of the # 1 high-speed permanent magnet explosion-proof centrifugal compressor is connected with a hot side inlet pipe of a flash evaporator heat exchanger, a feeding pipe at the upper part of a rectifying tower of the heat pump rectification regenerating system is connected with a cold side outlet pipe of a tower bottom liquid heat exchanger, a rectifying tower is connected with a # 2 demister, an air outlet pipe of the # 2 demister is connected with an air inlet pipe of the # 2 high-speed permanent magnet explosion-proof centrifugal compressor, and an air outlet pipe of the # 2 high-speed permanent magnet explosion-proof centrifugal compressor is connected with a shell inlet pipe of a reboiler.

Inventors

  • LIAN LEI
  • JIANG YANBIN

Assignees

  • 华南理工大学

Dates

Publication Date
20260505
Application Date
20240411

Claims (5)

  1. 1. The sour gas purifying system based on the double high-speed permanent magnet explosion-proof centrifugal compressor is characterized by comprising an absorption purifying system, an energy-saving flash evaporation system and a heat pump rectification regeneration system, wherein the absorption purifying system comprises a purifying agent storage tank, a fan and a purifying tower; The energy-saving flash evaporation system comprises a flash evaporation recovery tank, a 1# high-speed permanent magnet explosion-proof centrifugal compressor, a 1# demister, a flash evaporation tank and a flash evaporation gas heat exchanger, wherein the flash evaporation tank is connected with the 1# demister, an air outlet of the 1# demister is connected with an inlet pipe of the 1# high-speed permanent magnet explosion-proof centrifugal compressor, an outlet pipe of the 1# high-speed permanent magnet explosion-proof centrifugal compressor is connected with an inlet pipe of the hot side of the flash evaporation tank heat exchanger, an outlet pipe of the hot side of the flash evaporation tank heat exchanger is connected with a liquid inlet of the flash evaporation recovery tank, a cold side of the flash evaporation tank heat exchanger is connected with a discharge port of the flash evaporation tank, a cold side interface of the flash evaporation tank heat exchanger is connected with a transfer pump outlet pipe, an inlet pipe of the transfer pump is connected with a discharge port of the flash evaporation tank, a fan is connected with an air pipe of the outside natural gas and the refinery containing hydrogen sulfide and carbon dioxide, an outlet pipe of the purification tower is connected with an outside purified gas connecting pipe, an outlet flange of the purification agent storage tank is connected with an inlet pipe of the purification pump, an outlet pipe of the purification tank is connected with an inlet pipe of the purification pump; The heat pump rectification regeneration system comprises a rectification tower, a rectification recovery tank, a reboiler, a circulating water cooler, a tower bottom liquid heat exchanger, a No. 2 demister, a No. 2 high-speed permanent magnet explosion-proof centrifugal compressor, a flash evaporator heat exchanger cold side outlet hot side inlet connected with the tower bottom liquid heat exchanger cold side inlet, a tower bottom liquid heat exchanger hot side inlet pipe connected with the circulating water cooler hot side inlet pipe, a circulating water cooler hot side outlet pipe connected with a reflux pump outlet pipe, a rectification tower upper inlet pipe connected with the tower bottom liquid heat exchanger cold side outlet pipe, a No. 2 demister air outlet pipe connected with the No. 2 high-speed permanent magnet explosion-proof centrifugal compressor air inlet pipe, a No. 2 high-speed permanent magnet explosion-proof centrifugal compressor air outlet pipe connected with a reboiler shell layer inlet pipe, a rectification shell layer recovery tank liquid outlet connected with the rectification tower, a reboiler layer inlet pipe connected with a rectification tower circulating liquid outlet pipe, a reboiler layer inlet pipe connected with the reboiler layer inlet pipe, and a circulation pump inlet pipe connected with the reboiler layer inlet pipe.
  2. 2. The sour gas purifying system based on the double high-speed permanent magnet explosion-proof centrifugal compressor of claim 1, wherein the hot side inlet pipe of the tower kettle liquid heat exchanger is connected with the outlet pipe of the tower kettle liquid discharging pump, and the inlet pipe of the tower kettle liquid discharging pump is connected with the lower part of the rectifying tower.
  3. 3. The acid gas purifying system based on the double-high-speed permanent magnet explosion-proof centrifugal compressor is characterized in that a liquid outlet of the rectification recovery tank is connected with an inlet pipe of a reflux pump of a rectification tower, and a discharge pipe of the reflux pump of the rectification tower is connected with a reflux pipe of the rectification tower.
  4. 4. The sour gas purifying system based on the double high-speed permanent magnet explosion-proof centrifugal compressor, according to claim 3, is characterized in that a branch pipe is arranged on a pipeline connecting a discharge hole pipe of a reflux pump of the rectifying tower with a reflux pipe of the rectifying tower.
  5. 5. The sour gas purifying system based on the double high-speed permanent magnet explosion-proof centrifugal compressor of claim 1, wherein an inlet and an outlet on the cold side of the circulating water cooler are respectively connected with an external circulating cooling water inlet pipe and an external circulating cooling water outlet pipe.

Description

Acid gas purifying system based on double-high-speed permanent magnet explosion-proof centrifugal compressor Technical Field The invention relates to the technical field of natural gas and oil refinery acid gas desulfurization and decarbonization, in particular to a natural gas and oil refinery desulfurization and decarbonization full-flow energy-saving purification system. Background The development history of the desulfurization and decarbonization processes of natural gas and oil refineries is long, and in the 30 th century, the absorption process using alcohol amine solution as absorbent is the main stream process at that time. To date, natural gas and refinery desulfurization decarbonization processes and methods have also been derived from ever finer. In the prior art, an alkaline solvent is mainly utilized to chemically react with acid components such as H 2S、CO2, organic sulfur and the like in acid gas to form a certain compound, so as to capture acid substances and obtain the aim of purifying the acid gas. The chemical reaction is a reversible reaction, and the formed compound is decomposed under the conditions of temperature rise and pressure reduction, so that the captured acid gas is released, and the alkaline solvent is regenerated and recycled. Specifically, in the conventional alcohol amine desulfurization process, as shown in FIG. 1, a raw material gas S1 (the raw material gas mainly originates from a dry gas and a natural gas containing sulfur, which are produced in a refining process of sulfur-containing petroleum, and contains H 2、CO2、CH4、C2、C3、C4 and C 5 gas in addition to H 2 S) enters an absorption tower B1 from the bottom of the absorption tower B1, a gas phase stream goes up from the bottom, and a normal temperature absorbent liquid phase stream S14 (lean liquid) goes in from the top of the absorption tower B1 from the top. The gas-phase material flow and the absorbent liquid-phase material flow are in countercurrent contact, acid components such as H 2 S or CO 2 are absorbed by the absorbent in the process, a rich liquid S2 is formed at the bottom of the tower, and the gas S15 reaching the standard is purified to enter the next working procedure. The rich liquid S2 is extracted from the bottom of the absorption tower B1, is subjected to depressurization treatment by a depressurization valve B4 to form a material flow S3, enters a flash tank B3, and light components S4 such as dissolved and entrained hydrocarbons in the rich liquid S2 are flashed out and then collected to enter the next working procedure. the rich liquid S5 at the bottom of the flash tank B3 is pumped into the lean and rich liquid heat exchange system B5, a material flow S7 formed after preheating is fed into the rectifying tower B2 for separation, acid gas is led out from the top of the rectifying tower B2 and fed into the condensation cooler, finally, the acid gas enters the reflux tank, and high-concentration acid substances such as H 2 S or CO 2 are extracted as a product S9 through the reflux pump for the next working procedure. Lean solution S8 at the bottom of the rectifying tower enters a lean-rich solution heat exchange system B5 to be cooled to form a stream S6, the stream S6 enters a lean solution supplementing system B8 to be mixed with supplementing water S10 and supplementing amine solution S11 to form a stream S12, the stream S12 is pumped by a feed pump B6 to form a stream S13, the stream S13 is conveyed to pass through a circulating water cooler B7 to form a stream S14, and finally, the stream S enters the top of the absorbing tower to be recycled. The prior art desulfurization and decarbonization represented by fig. 1 requires a conventional rectification process, and the energy consumption is very large, and the main energy consumption is derived from three parts, namely steam consumption, cooling circulating water consumption and electricity consumption. The related literature reports that the steam consumption reaches 73.26%, the cooling circulating water consumption is 20.30%, and the electricity consumption is 6.44%. Disclosure of Invention In order to solve the problem of high energy consumption in the prior art, the invention provides the sour gas purifying system based on the double-high-speed permanent magnet explosion-proof centrifugal compressor, which is capable of remarkably reducing the consumption of external steam, greatly improving the energy utilization efficiency of the system, remarkably reducing the energy consumption of the system and achieving high purifying efficiency. In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: The acid gas purifying system based on the double high-speed permanent magnet explosion-proof centrifugal compressor comprises an absorption purifying system, an energy-saving flash evaporation system and a heat pump rectification regenerating system, wherein the absorption purifying system c