CN112246075A - Ammonia washing tower, and anti-corrosion conversion gas ammonia washing device and process using same - Google Patents

Ammonia washing tower, and anti-corrosion conversion gas ammonia washing device and process using same Download PDF

Info

Publication number
CN112246075A
CN112246075A CN202011247744.5A CN202011247744A CN112246075A CN 112246075 A CN112246075 A CN 112246075A CN 202011247744 A CN202011247744 A CN 202011247744A CN 112246075 A CN112246075 A CN 112246075A
Authority
CN
China
Prior art keywords
ammonia
gas
section
condensate
analysis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011247744.5A
Other languages
Chinese (zh)
Inventor
张蒙恩
张洋洋
肖建华
孟雪
王相令
张超
茹祥举
宋仁委
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henan Xinlianxin Chemicals Group Co Ltd
Original Assignee
Henan Xinlianxin Chemicals Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Henan Xinlianxin Chemicals Group Co Ltd filed Critical Henan Xinlianxin Chemicals Group Co Ltd
Priority to CN202011247744.5A priority Critical patent/CN112246075A/en
Publication of CN112246075A publication Critical patent/CN112246075A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/06—Flash distillation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1412—Controlling the absorption process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1431—Pretreatment by other processes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/001—Purifying combustible gases containing carbon monoxide working-up the condensates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
    • C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
    • C10K1/101—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids with water only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B01D2252/103—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/406—Ammonia
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention belongs to an ammonia washing tower and an anti-corrosion conversion gas ammonia washing device and process using the same; the system comprises a former process conversion gas pipeline, wherein the former process conversion gas pipeline is connected with a conversion gas inlet of an ammonia washing tower through a water cooler shell pass; the ammonia washing tower sequentially comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top; one side of the flash evaporation section is provided with a conversion gas inlet, and the bottom of the flash evaporation section is provided with a flash evaporation condensate outlet; the cooling section comprises a chilled water cooler; the ammonia washing section comprises a plurality of layers of floating valve trays and an air distribution cap assembly; the top of the prewashing analysis section is provided with a conversion gas outlet, and one side of the prewashing analysis section is provided with a desalted water inlet; the ammonia washing tower has the advantages that ammonia can be uniformly absorbed in the ammonia washing section on the premise of improving the solubility of the ammonia, and the pH of the condensate is neutral after the ammonia, carbon dioxide and other acidic gases are dissolved in water, so that the acidic environment in the ammonia washing tower is changed, and the corrosion of internal parts or linings of the ammonia washing tower is avoided.

Description

Ammonia washing tower, and anti-corrosion conversion gas ammonia washing device and process using same
Technical Field
The invention belongs to the technical field of gas purification in coal chemical industry, and particularly relates to an ammonia washing tower, and an anti-corrosion conversion gas ammonia washing device and process using the same.
Background
The coal gasification process gas contains CO and H2、CO2And water, typically by a CO shift process, to convert some or all of the CO to H2And the separation of each effective component is completed by a low-temperature methanol washing process. Before the shift gas enters the low-temperature methanol washing process, an ammonia washing tower is arranged to remove trace NH in the shift gas by using desalted water3Preventing ammonia accumulation in the low-temperature methanol washing device. Because of the carbon dioxide, hydrogen sulfide and other acidic components contained in the conversion gas, the ammonia washing tower is in an acidic environment for a long time in the working process, the acidic environment causes serious corrosion to internal parts and linings of the ammonia washing tower, and the risk of high-pressure process gas leakage exists in serious cases; aiming at the corrosion phenomenon of the ammonia washing tower, common enterprises delay the corrosion by improving the material of the internal parts or the lining, and the material of the type has higher cost,and the later maintenance cost is also higher, so that the corrosion problem cannot be fundamentally solved. And the carbon dioxide is a process gas mainly used in the later period, so that the carbon dioxide cannot be separated, and the ammonia washing tower is in the operation environment with potential safety hazards for a long time based on the long-term existence of the acid environment.
Disclosure of Invention
Aiming at the defects of the prior art, the ammonia washing tower, the anti-corrosion conversion gas ammonia washing device and the anti-corrosion conversion gas ammonia washing process have the advantages that the structure is simple, the process flow design is reasonable, ammonia can be uniformly absorbed in the ammonia washing section on the premise of improving the solubility of the ammonia, and the pH of a condensate is neutral after acidic gases such as the ammonia and carbon dioxide are dissolved in water, so that the acidic environment in the ammonia washing tower is changed, and the corrosion of internal parts or linings of the ammonia washing tower is avoided.
In order to achieve the purpose, the invention adopts the technical scheme that:
an ammonia washing tower comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top in sequence;
a conversion gas inlet is formed in one side of the flash evaporation section, and a flash evaporation condensate outlet is formed in the bottom of the flash evaporation section;
the cooling section comprises a chilled water cooler for cooling the shift gas and improving the solubility of the gas ammonia;
the ammonia washing section comprises a plurality of layers of float valve tower trays and an air distribution cap assembly arranged on the tops of the float valve tower trays;
the top of the pre-washing analysis section is provided with a shifted gas outlet, the upper part of one side of the pre-washing analysis section is provided with a desalted water inlet, the wall of the ammonia washing tower on one side of the upper part of the gas distribution cap component is provided with a pre-washing analysis condensate outlet, and the wall of the ammonia washing tower of the top-layer floating valve tower tray and the gas distribution cap component is provided with a pre-washing analysis condensate inlet; a condensate pump and a liquid-phase ammonia content analyzer are arranged between the prewashing analysis condensate outlet and the prewashing analysis condensate inlet.
Preferably, the flash evaporation condensate outlet is connected with a condensate treatment device through a pipeline.
Preferably, the cold end inlet of the chilled water cooler is connected with the chilled water inlet pipe network, and the cold end outlet of the chilled water cooler is connected with the chilled water outlet pipe network.
Preferably, the floating valve tower tray is 2-4 layers.
Preferably, the gas distribution cap assembly comprises a partition plate connected with the wall of the ammonia washing tower, a hole is formed in the middle of the partition plate, a cylinder matched with the hole is arranged at the top of the partition plate outside the hole, and a gas cap for communicating the ammonia washing section with the pre-washing analysis section is arranged at the top of the cylinder;
the setting height of the prewashing analysis condensate outlet is not higher than that of the cylinder.
Preferably, the desalinated water inlet is connected to the desalinated water pipe network through a valve.
The invention also provides an anti-corrosion shift gas ammonia washing device which comprises a former process shift gas pipeline, wherein the former process shift gas pipeline is connected with the shift gas inlet of the ammonia washing tower through the shell pass of the water cooler.
Preferably, the tube side inlet of the water cooler is connected with a circulating water inlet pipe network, and the tube side outlet of the water cooler is connected with a circulating water outlet pipe network.
Preferably, a shift gas outlet of the ammonia washing tower is connected with the low-temperature methanol washing section through a gas-phase ammonia content analyzer.
The invention also provides a process of the anti-corrosion ammonia conversion and gas washing device, which comprises the following steps:
step 1: the ammonia-containing shift gas in the shift gas pipeline in the previous process is cooled through the shell pass of the water cooler and then enters a flash evaporation section of the ammonia washing tower through a shift gas inlet; the temperature of the ammonia-containing shift gas is 70-90 ℃, and the ammonia content is 0.015-0.030%; the temperature of the ammonia-containing shift gas passing through the shell pass of the water cooler is 30-40 ℃; circulating water in the circulating water inlet pipe network in the process of exchanging heat with ammonia-containing shift gas passes through the pipe pass of the water-water cooler and then enters the circulating water outlet pipe network;
step 2: the converted gas enters a flash evaporation section of the ammonia washing tower for flash evaporation, and flash evaporation condensate enters a condensate treatment device through a flash evaporation condensate outlet at the bottom of the ammonia washing tower for treatment; the flash evaporation gas upwards runs and enters a cooling section;
and step 3: cooling the flash evaporation gas to 10-20 ℃ in a cooling section by a chilled water cooler, and improving the solubility of ammonia in the flash evaporation gas after cooling; in the cooling process, the chilled water in the chilled water inlet pipe network enters the chilled water outlet pipe network after exchanging heat with flash evaporation gas in the chilled water cooler;
and 4, step 4: the cooled flash steam continuously ascends to enter an ammonia washing section; the ammonia washing section is filled with pre-washing analysis condensate in the pre-washing analysis section through a condensate pump; the ratio of the amount of the prewashing analysis condensate to the flow of the converted gas entering the ammonia washing section is 1kg: 200-400 Nm 3; the pH value of the prewashing analysis condensate is 6.0-7.2, and the ammonia nitrogen content is 562-782 ppm;
the efficiency of dissolving ammonia in the prewashing analysis condensate is improved by improving the solubility of ammonia in flash steam and reducing the consumption of the prewashing analysis condensate, and the ammonia is uniformly distributed in a plurality of layers of floating valve trays, so that the prewashing analysis condensate can be sufficiently dissolved in each layer of floating valve trays and is used for neutralizing carbon dioxide and hydrogen sulfide dissolved in the prewashing analysis condensate, and the pH value of the prewashing analysis condensate after the ammonia washing section is 6.5-7.2, thereby achieving the purpose of preventing corrosion of an ammonia washing tower and internal parts thereof;
and 5: the prewashing analysis condensate after the ammonia washing section enters a flash evaporation section and then enters a condensate treatment device through a flash evaporation condensate outlet at the bottom of the ammonia washing tower for treatment;
step 6: the flash gas passing through the ammonia washing section continuously goes upward to pass through a gas cap to enter a pre-washing analysis section, and enters a low-temperature methanol washing section through a conversion gas outlet and a gas-phase ammonia content analyzer after being absorbed by desalted water; analyzing the gas ammonia content of the gas phase passing through the prewashing analysis section by a gas-phase ammonia content analyzer to be 1-10 ppm;
and 7: when the pH value of the pre-washing analysis condensate entering the ammonia washing section in the step 4 is less than 6.0, reducing the frequency of a condensate pump to reduce the amount of the pre-washing analysis condensate entering the ammonia washing section until the pH value of the pre-washing analysis condensate is not less than 6.0;
and 8: and (3) when the content of the gaseous ammonia in the step (6) is more than 10ppm, increasing the opening degree of the valve to increase the amount of desalted water entering the prewashing analysis section for absorbing the redundant ammonia until the content of the gaseous ammonia is not more than 10 ppm.
According to the ammonia washing tower and the anti-corrosion conversion gas ammonia washing device and process using the same, the chilled water cooler is arranged for cooling the conversion gas so as to achieve the purpose of improving the solubility of ammonia gas in water, and the improvement of the solubility of ammonia gas in water can be beneficial to the rapid absorption of ammonia gas and can also be beneficial to a condensate in which acid gas is dissolved in water so as to change the pH value of the condensate and enable the ammonia washing tower to be in a neutral environment; furthermore, the invention can enable the surplus ammonia gas to go upward and be uniformly distributed in the ammonia washing section by limiting the amount of the pre-washing analysis condensate, thereby avoiding the upper part of the ammonia washing section from being in an acid environment; meanwhile, after the solubility of the ammonia gas is improved, the ammonia gas can be quickly and effectively absorbed in a prewashing analysis section, and the purpose that the subsequent working section is influenced due to the overhigh content of the ammonia gas in the converted gas is avoided; the ammonia washing tower has the advantages of simple structure, reasonable design of process flow, small occupied area, saving of the use amount of the ammonia washing desalted water, capability of enabling ammonia gas to uniformly absorb ammonia gas in the ammonia washing section on the premise of improving the solubility of the ammonia gas, and capability of enabling the pH of a condensate to be neutral after the ammonia gas, carbon dioxide and other acidic gases are dissolved in water, so that the change of the internal acidic environment of the ammonia washing tower is realized, and thus, the corrosion of internal parts or linings of the ammonia washing tower is avoided.
Drawings
FIG. 1 is a schematic diagram of the ammonia scrubber of the present invention.
FIG. 2 is a schematic structural diagram of the shift gas ammonia scrubber of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1: the invention relates to an ammonia washing tower, and an anti-corrosion shift gas ammonia washing device and process using the same, wherein an ammonia washing tower 3 sequentially comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top; a conversion gas inlet 17 is formed in one side of the flash evaporation section, and a flash evaporation condensate outlet 18 is formed in the bottom of the flash evaporation section; the cooling section comprises a chilled water cooler 4 for cooling the shift gas and improving the solubility of the gas ammonia; the ammonia washing section comprises a plurality of layers of float valve trays 5 and an air distribution cap assembly arranged on the tops of the float valve trays 5; the top of the pre-washing analysis section is provided with a shifted gas outlet 19, the upper part of one side of the pre-washing analysis section is provided with a desalted water inlet 20, the wall of the ammonia washing tower on one side of the upper part of the gas distribution cap component is provided with a pre-washing analysis condensate outlet 21, and the wall of the ammonia washing tower of the top-layer floating valve tower tray 5 and the gas distribution cap component is provided with a pre-washing analysis condensate inlet 22; a condensate pump 10 and a liquid-phase ammonia content analyzer 11 are arranged between the prewashing analysis condensate outlet 21 and the prewashing analysis condensate inlet 22. The flash evaporation condensate outlet 18 is connected with the condensate treatment device 9 through a pipeline. The cold end import of refrigerated water cooler 4 links to each other with refrigerated water inlet pipe network 15, and the cold end export of refrigerated water cooler 4 links to each other with refrigerated water outlet pipe network 16. The floating valve tower tray 5 is 2-4 layers. The gas distribution cap component comprises a partition plate 23 connected with the wall of the ammonia washing tower, a hole 24 is formed in the middle of the partition plate, a cylinder 25 matched with the hole 24 is arranged at the top of the partition plate 23 on the outer side of the hole 24, and a gas cap 6 enabling the ammonia washing section and the pre-washing analysis section to be communicated is arranged at the top of the cylinder 25; the pre-wash analysis condensate outlet 21 is disposed at a height no greater than the height of the cylinder 25. The desalinated water inlet 20 is connected to the desalinated water network 12 via a valve 26. According to the ammonia washing device, the absorption rate of ammonia can be improved, the ammonia washing tower 3 can be positioned in a neutral environment due to absorption of acidic gas by the aid of the ammonia absorption rate, corrosion of internal parts or linings of the ammonia washing tower 3 is avoided, and desalted water positioned at the top of the partition plate 23 can effectively and quickly absorb ammonia, so that the influence of ammonia escape on subsequent processes is avoided, a pre-washing analysis section is prevented from being positioned in an acidic environment, and pre-washing analysis condensate can further enter the ammonia washing section to effectively absorb ammonia; in addition, the invention is also provided with a liquid-phase ammonia content analyzer 11 which is matched with the structure of the ammonia washing tower 3 in the invention to calibrate the ammonia content of the condensate and the conversion gas, thereby avoiding the deviation caused by complex gas composition and low ammonia content in gas-phase analysis.
Referring to fig. 1 and 2: the invention also provides an anti-corrosion shift gas ammonia washing device, which comprises a former process shift gas pipeline 1, wherein the former process shift gas pipeline 1 is connected with a shift gas inlet 17 of the ammonia washing tower 3 through a shell pass of a water cooler 2. And the tube side inlet of the water cooler 2 is connected with a circulating water inlet pipe network 13, and the tube side outlet of the water cooler 2 is connected with a circulating water outlet pipe network 14. And a transformation gas outlet 19 of the ammonia washing tower 3 is connected with the low-temperature methanol washing section 8 through a gas-phase ammonia content analyzer 7. Through the setting, the ammonia washing tower 3 can continuously and stably operate and the corrosion of the internal parts or the lining inside the ammonia washing tower 3 can be prevented, and the conversion gas passing through the ammonia washing tower 3 can be monitored in real time through the gas-phase ammonia content analyzer 7 so as to prevent the ammonia content from being too high to influence the operation of the subsequent working section.
The invention also provides a process of the anti-corrosion ammonia conversion and gas washing device, which comprises the following steps:
step 1: the ammonia-containing shift gas in the shift gas pipeline 1 in the previous process is cooled through the shell pass of the water cooler 2 and then enters a flash evaporation section of the ammonia washing tower 3 through a shift gas inlet 17; the temperature of the ammonia-containing shift gas is 70-90 ℃, and the ammonia content is 0.015-0.030%; the temperature of the ammonia-containing shift gas passing through the shell pass of the water cooler 2 is 30-40 ℃; circulating water in the circulating water inlet pipe network 13 in the process of exchanging heat with the ammonia-containing shift gas passes through the pipe pass of the water-water cooler 2 and then enters the circulating water outlet pipe network 14;
step 2: the converted gas enters a flash evaporation section of the ammonia washing tower 3 for flash evaporation, and flash evaporation condensate enters a condensate treatment device 9 for treatment through a flash evaporation condensate outlet 18 at the bottom of the ammonia washing tower 3; the flash evaporation gas upwards runs and enters a cooling section;
and step 3: the flash evaporation gas is cooled to 10-20 ℃ in a cooling section by a chilled water cooler 4, and the solubility of ammonia in the flash evaporation gas can be improved after the flash evaporation gas is cooled; in the cooling process, the chilled water in the chilled water inlet pipe network 15 enters the chilled water outlet pipe network 16 after exchanging heat with flash evaporation gas in the chilled water cooler 4;
and 4, step 4: the cooled flash steam continuously ascends to enter an ammonia washing section; the ammonia washing section is fed with prewashing analysis condensate in the prewashing analysis section through a condensate pump 10; the ratio of the amount of the prewashing analysis condensate to the flow of the converted gas entering the ammonia washing section is 1kg: 200-400 Nm 3; the pH value of the prewashing analysis condensate is 6.0-7.2, and the ammonia nitrogen content is 562-782 ppm;
the efficiency of dissolving ammonia in the prewashing analysis condensate is improved by improving the solubility of ammonia in flash steam and reducing the consumption of the prewashing analysis condensate, and the ammonia is uniformly distributed in a plurality of layers of floating valve trays 5, so that the prewashing analysis condensate can be enough dissolved in each layer of floating valve trays 5 to neutralize carbon dioxide and hydrogen sulfide dissolved in the prewashing analysis condensate, and the pH value of the prewashing analysis condensate after the ammonia washing section is 6.5-7.2, thereby realizing the purpose of preventing the ammonia washing tower 3 and internal parts thereof from being corroded;
and 5: the prewashing analysis condensate after the ammonia washing section enters a flash evaporation section and then enters a condensate treatment device 9 for treatment through a flash evaporation condensate outlet 18 at the bottom of the ammonia washing tower 3;
step 6: the flash gas passing through the ammonia washing section continuously goes upward to pass through a gas cap 6 to enter a pre-washing analysis section, and enters a low-temperature methanol washing section 8 through a shifted gas outlet 19 and a gas-phase ammonia content analyzer 7 after being absorbed by desalted water; a gas-phase ammonia content analyzer 7 for analyzing the gas-phase ammonia content of the gas phase passing through the prewashing analysis section to be 1-10 ppm;
and 7: when the pH value of the pre-washing analysis condensate entering the ammonia washing section in the step 4 is less than 6.0, reducing the frequency of a condensate pump 10 to reduce the amount of the pre-washing analysis condensate entering the ammonia washing section until the pH value of the pre-washing analysis condensate is not less than 6.0;
and 8: when the content of the gaseous ammonia in the step 6 is more than 10ppm, the opening degree of the valve 26 is increased so as to increase the amount of the desalted water entering the prewashing analysis section for absorbing the redundant ammonia until the content of the gaseous ammonia is not more than 10 ppm.
The invention changes the traditional mode of using a large amount of desalted water to flood so as to quickly absorb ammonia gas, and the mode can basically absorb the ammonia gas when the ammonia gas is at the lower part of the ammonia washing tower due to the large amount of desalted water, so that the desalted water at the upper part of the ammonia washing tower only absorbs carbon dioxide or hydrogen sulfide to cause the influence of acidic environment; the invention adopts a small amount of desalted water (prewashing analysis condensate) to uniformly absorb ammonia gas, and the ammonia gas is filled in the ammonia washing section to ensure that the condensate for absorbing carbon dioxide, hydrogen sulfide and ammonia gas is always in a neutral environment, and further, the invention specially arranges a freezing water cooler 4 to achieve the purpose of improving the absorption efficiency in order to prevent the subsequent working section from being influenced by insufficient ammonia gas absorption; in conclusion, a small amount of desalted water is used for absorbing ammonia gas, and a uniform and rapid absorption mode is adopted to enable the pH value of the condensate to be in a neutral state, so that the defect that the traditional rapid ammonia gas absorption mode is overcome, and finally the dilemma that the operation of equipment is affected because the interior of the ammonia washing tower becomes an acidic environment due to acidity of the condensate is avoided. The method can reduce the use amount of desalted water in the ammonia washing tower to 1/5-1/4 in the prior art, ensures that the content of gas-phase ammonia at the outlet of the ammonia washing tower is less than 10ppm, simultaneously ensures that the ammonia washing section and the pre-washing analysis section of the ammonia washing tower are in neutral environment, and the pH value can reach 6.0-7.2, thereby realizing no corrosion in the ammonia washing tower 3.
The present invention will now be further illustrated with reference to examples in order to explain the present invention in more detail. The specific embodiment is as follows:
example 1
An ammonia washing tower 3 sequentially comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top; a conversion gas inlet 17 is formed in one side of the flash evaporation section, and a flash evaporation condensate outlet 18 is formed in the bottom of the flash evaporation section; the cooling section comprises a chilled water cooler 4 for cooling the shift gas and improving the solubility of the gas ammonia; the ammonia washing section comprises a plurality of layers of float valve trays 5 and an air distribution cap assembly arranged on the tops of the float valve trays 5; the top of the pre-washing analysis section is provided with a shifted gas outlet 19, the upper part of one side of the pre-washing analysis section is provided with a desalted water inlet 20, the wall of the ammonia washing tower on one side of the upper part of the gas distribution cap component is provided with a pre-washing analysis condensate outlet 21, and the wall of the ammonia washing tower of the top-layer floating valve tower tray 5 and the gas distribution cap component is provided with a pre-washing analysis condensate inlet 22; a condensate pump 10 and a liquid-phase ammonia content analyzer 11 are arranged between the prewashing analysis condensate outlet 21 and the prewashing analysis condensate inlet 22. The flash evaporation condensate outlet 18 is connected with the condensate treatment device 9 through a pipeline. The cold end import of refrigerated water cooler 4 links to each other with refrigerated water inlet pipe network 15, and the cold end export of refrigerated water cooler 4 links to each other with refrigerated water outlet pipe network 16. The float valve tray 5 has 2 layers. The gas distribution cap component comprises a partition plate 23 connected with the wall of the ammonia washing tower, a hole 24 is formed in the middle of the partition plate, a cylinder 25 matched with the hole 24 is arranged at the top of the partition plate 23 on the outer side of the hole 24, and a gas cap 6 enabling the ammonia washing section and the pre-washing analysis section to be communicated is arranged at the top of the cylinder 25; the pre-wash analysis condensate outlet 21 is disposed at a height no greater than the height of the cylinder 25. The desalinated water inlet 20 is connected to the desalinated water network 12 via a valve 26.
Example 2
An ammonia washing tower 3 sequentially comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top; a conversion gas inlet 17 is formed in one side of the flash evaporation section, and a flash evaporation condensate outlet 18 is formed in the bottom of the flash evaporation section; the cooling section comprises a chilled water cooler 4 for cooling the shift gas and improving the solubility of the gas ammonia; the ammonia washing section comprises a plurality of layers of float valve trays 5 and an air distribution cap assembly arranged on the tops of the float valve trays 5; the top of the pre-washing analysis section is provided with a shifted gas outlet 19, the upper part of one side of the pre-washing analysis section is provided with a desalted water inlet 20, the wall of the ammonia washing tower on one side of the upper part of the gas distribution cap component is provided with a pre-washing analysis condensate outlet 21, and the wall of the ammonia washing tower of the top-layer floating valve tower tray 5 and the gas distribution cap component is provided with a pre-washing analysis condensate inlet 22; a condensate pump 10 and a liquid-phase ammonia content analyzer 11 are arranged between the prewashing analysis condensate outlet 21 and the prewashing analysis condensate inlet 22. The flash evaporation condensate outlet 18 is connected with the condensate treatment device 9 through a pipeline. The cold end import of refrigerated water cooler 4 links to each other with refrigerated water inlet pipe network 15, and the cold end export of refrigerated water cooler 4 links to each other with refrigerated water outlet pipe network 16. The float valve tray 5 has 4 layers. The gas distribution cap component comprises a partition plate 23 connected with the wall of the ammonia washing tower, a hole 24 is formed in the middle of the partition plate, a cylinder 25 matched with the hole 24 is arranged at the top of the partition plate 23 on the outer side of the hole 24, and a gas cap 6 enabling the ammonia washing section and the pre-washing analysis section to be communicated is arranged at the top of the cylinder 25; the pre-wash analysis condensate outlet 21 is disposed at a height no greater than the height of the cylinder 25. The desalinated water inlet 20 is connected to the desalinated water network 12 via a valve 26.
Example 3
An ammonia washing tower 3 sequentially comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top; a conversion gas inlet 17 is formed in one side of the flash evaporation section, and a flash evaporation condensate outlet 18 is formed in the bottom of the flash evaporation section; the cooling section comprises a chilled water cooler 4 for cooling the shift gas and improving the solubility of the gas ammonia; the ammonia washing section comprises a plurality of layers of float valve trays 5 and an air distribution cap assembly arranged on the tops of the float valve trays 5; the top of the pre-washing analysis section is provided with a shifted gas outlet 19, the upper part of one side of the pre-washing analysis section is provided with a desalted water inlet 20, the wall of the ammonia washing tower on one side of the upper part of the gas distribution cap component is provided with a pre-washing analysis condensate outlet 21, and the wall of the ammonia washing tower of the top-layer floating valve tower tray 5 and the gas distribution cap component is provided with a pre-washing analysis condensate inlet 22; a condensate pump 10 and a liquid-phase ammonia content analyzer 11 are arranged between the prewashing analysis condensate outlet 21 and the prewashing analysis condensate inlet 22. The flash evaporation condensate outlet 18 is connected with the condensate treatment device 9 through a pipeline. The cold end import of refrigerated water cooler 4 links to each other with refrigerated water inlet pipe network 15, and the cold end export of refrigerated water cooler 4 links to each other with refrigerated water outlet pipe network 16. The float valve tray 5 has 3 layers. The gas distribution cap component comprises a partition plate 23 connected with the wall of the ammonia washing tower, a hole 24 is formed in the middle of the partition plate, a cylinder 25 matched with the hole 24 is arranged at the top of the partition plate 23 on the outer side of the hole 24, and a gas cap 6 enabling the ammonia washing section and the pre-washing analysis section to be communicated is arranged at the top of the cylinder 25; the pre-wash analysis condensate outlet 21 is disposed at a height no greater than the height of the cylinder 25. The desalinated water inlet 20 is connected to the desalinated water network 12 via a valve 26.
Example 4
An ammonia washing tower 3 sequentially comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top; a conversion gas inlet 17 is formed in one side of the flash evaporation section, and a flash evaporation condensate outlet 18 is formed in the bottom of the flash evaporation section; the cooling section comprises a chilled water cooler 4 for cooling the shift gas and improving the solubility of the gas ammonia; the ammonia washing section comprises a plurality of layers of float valve trays 5 and an air distribution cap assembly arranged on the tops of the float valve trays 5; the top of the pre-washing analysis section is provided with a shifted gas outlet 19, the upper part of one side of the pre-washing analysis section is provided with a desalted water inlet 20, the wall of the ammonia washing tower on one side of the upper part of the gas distribution cap component is provided with a pre-washing analysis condensate outlet 21, and the wall of the ammonia washing tower of the top-layer floating valve tower tray 5 and the gas distribution cap component is provided with a pre-washing analysis condensate inlet 22; a condensate pump 10 and a liquid-phase ammonia content analyzer 11 are arranged between the prewashing analysis condensate outlet 21 and the prewashing analysis condensate inlet 22. The flash evaporation condensate outlet 18 is connected with the condensate treatment device 9 through a pipeline. The cold end import of refrigerated water cooler 4 links to each other with refrigerated water inlet pipe network 15, and the cold end export of refrigerated water cooler 4 links to each other with refrigerated water outlet pipe network 16. The floating valve tower tray 5 is 2-4 layers. The gas distribution cap component comprises a partition plate 23 connected with the wall of the ammonia washing tower, a hole 24 is formed in the middle of the partition plate, a cylinder 25 matched with the hole 24 is arranged at the top of the partition plate 23 on the outer side of the hole 24, and a gas cap 6 enabling the ammonia washing section and the pre-washing analysis section to be communicated is arranged at the top of the cylinder 25; the pre-wash analysis condensate outlet 21 is disposed at a height no greater than the height of the cylinder 25. The desalinated water inlet 20 is connected to the desalinated water network 12 via a valve 26.
An anti-corrosion shift gas ammonia washing device comprises a pre-process shift gas pipeline 1, wherein the pre-process shift gas pipeline 1 is connected with a shift gas inlet 17 of an ammonia washing tower 3 through a shell pass of a water cooler 2. And the tube side inlet of the water cooler 2 is connected with a circulating water inlet pipe network 13, and the tube side outlet of the water cooler 2 is connected with a circulating water outlet pipe network 14. And a transformation gas outlet 19 of the ammonia washing tower 3 is connected with the low-temperature methanol washing section 8 through a gas-phase ammonia content analyzer 7.
Example 5
An ammonia washing tower 3 sequentially comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top; a conversion gas inlet 17 is formed in one side of the flash evaporation section, and a flash evaporation condensate outlet 18 is formed in the bottom of the flash evaporation section; the cooling section comprises a chilled water cooler 4 for cooling the shift gas and improving the solubility of the gas ammonia; the ammonia washing section comprises a plurality of layers of float valve trays 5 and an air distribution cap assembly arranged on the tops of the float valve trays 5; the top of the pre-washing analysis section is provided with a shifted gas outlet 19, the upper part of one side of the pre-washing analysis section is provided with a desalted water inlet 20, the wall of the ammonia washing tower on one side of the upper part of the gas distribution cap component is provided with a pre-washing analysis condensate outlet 21, and the wall of the ammonia washing tower of the top-layer floating valve tower tray 5 and the gas distribution cap component is provided with a pre-washing analysis condensate inlet 22; a condensate pump 10 and a liquid-phase ammonia content analyzer 11 are arranged between the prewashing analysis condensate outlet 21 and the prewashing analysis condensate inlet 22. The flash evaporation condensate outlet 18 is connected with the condensate treatment device 9 through a pipeline. The cold end import of refrigerated water cooler 4 links to each other with refrigerated water inlet pipe network 15, and the cold end export of refrigerated water cooler 4 links to each other with refrigerated water outlet pipe network 16. The floating valve tower tray 5 is 2-4 layers. The gas distribution cap component comprises a partition plate 23 connected with the wall of the ammonia washing tower, a hole 24 is formed in the middle of the partition plate, a cylinder 25 matched with the hole 24 is arranged at the top of the partition plate 23 on the outer side of the hole 24, and a gas cap 6 enabling the ammonia washing section and the pre-washing analysis section to be communicated is arranged at the top of the cylinder 25; the pre-wash analysis condensate outlet 21 is disposed at a height no greater than the height of the cylinder 25. The desalinated water inlet 20 is connected to the desalinated water network 12 via a valve 26.
An anti-corrosion shift gas ammonia washing device comprises a pre-process shift gas pipeline 1, wherein the pre-process shift gas pipeline 1 is connected with a shift gas inlet 17 of an ammonia washing tower 3 through a shell pass of a water cooler 2. And the tube side inlet of the water cooler 2 is connected with a circulating water inlet pipe network 13, and the tube side outlet of the water cooler 2 is connected with a circulating water outlet pipe network 14. And a transformation gas outlet 19 of the ammonia washing tower 3 is connected with the low-temperature methanol washing section 8 through a gas-phase ammonia content analyzer 7.
The invention also provides a process of the anti-corrosion ammonia conversion and gas washing device, which comprises the following steps:
step 1: the ammonia-containing shift gas in the shift gas pipeline 1 in the previous process is cooled through the shell pass of the water cooler 2 and then enters a flash evaporation section of the ammonia washing tower 3 through a shift gas inlet 17; the temperature of the ammonia-containing shift gas is 70-90 ℃, and the ammonia content is 0.015-0.030%; the temperature of the ammonia-containing shift gas passing through the shell pass of the water cooler 2 is 30-40 ℃; circulating water in the circulating water inlet pipe network 13 in the process of exchanging heat with the ammonia-containing shift gas passes through the pipe pass of the water-water cooler 2 and then enters the circulating water outlet pipe network 14;
step 2: the converted gas enters a flash evaporation section of the ammonia washing tower 3 for flash evaporation, and flash evaporation condensate enters a condensate treatment device 9 for treatment through a flash evaporation condensate outlet 18 at the bottom of the ammonia washing tower 3; the flash evaporation gas upwards runs and enters a cooling section;
and step 3: the flash evaporation gas is cooled to 10-20 ℃ in a cooling section by a chilled water cooler 4, and the solubility of ammonia in the flash evaporation gas can be improved after the flash evaporation gas is cooled; in the cooling process, the chilled water in the chilled water inlet pipe network 15 enters the chilled water outlet pipe network 16 after exchanging heat with flash evaporation gas in the chilled water cooler 4;
and 4, step 4: the cooled flash steam continuously ascends to enter an ammonia washing section; the ammonia washing section is fed with prewashing analysis condensate in the prewashing analysis section through a condensate pump 10; the ratio of the amount of the prewashing analysis condensate to the flow of the converted gas entering the ammonia washing section is 1kg: 200-400 Nm 3; the pH value of the prewashing analysis condensate is 6.0-7.2, and the ammonia nitrogen content is 562-782 ppm;
the efficiency of dissolving ammonia in the prewashing analysis condensate is improved by improving the solubility of ammonia in flash steam and reducing the consumption of the prewashing analysis condensate, and the ammonia is uniformly distributed in a plurality of layers of floating valve trays 5, so that the prewashing analysis condensate can be enough dissolved in each layer of floating valve trays 5 to neutralize carbon dioxide and hydrogen sulfide dissolved in the prewashing analysis condensate, and the pH value of the prewashing analysis condensate after the ammonia washing section is 6.5-7.2, thereby realizing the purpose of preventing the ammonia washing tower 3 and internal parts thereof from being corroded;
and 5: the prewashing analysis condensate after the ammonia washing section enters a flash evaporation section and then enters a condensate treatment device 9 for treatment through a flash evaporation condensate outlet 18 at the bottom of the ammonia washing tower 3;
step 6: the flash gas passing through the ammonia washing section continuously goes upward to pass through a gas cap 6 to enter a pre-washing analysis section, and enters a low-temperature methanol washing section 8 through a shifted gas outlet 19 and a gas-phase ammonia content analyzer 7 after being absorbed by desalted water; and a gas-phase ammonia content analyzer 7 for analyzing the gas-phase ammonia content of the gas phase passing through the prewashing analysis section to be 1-10 ppm.
Example 6
An ammonia washing tower 3 sequentially comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top; a conversion gas inlet 17 is formed in one side of the flash evaporation section, and a flash evaporation condensate outlet 18 is formed in the bottom of the flash evaporation section; the cooling section comprises a chilled water cooler 4 for cooling the shift gas and improving the solubility of the gas ammonia; the ammonia washing section comprises a plurality of layers of float valve trays 5 and an air distribution cap assembly arranged on the tops of the float valve trays 5; the top of the pre-washing analysis section is provided with a shifted gas outlet 19, the upper part of one side of the pre-washing analysis section is provided with a desalted water inlet 20, the wall of the ammonia washing tower on one side of the upper part of the gas distribution cap component is provided with a pre-washing analysis condensate outlet 21, and the wall of the ammonia washing tower of the top-layer floating valve tower tray 5 and the gas distribution cap component is provided with a pre-washing analysis condensate inlet 22; a condensate pump 10 and a liquid-phase ammonia content analyzer 11 are arranged between the prewashing analysis condensate outlet 21 and the prewashing analysis condensate inlet 22. The flash evaporation condensate outlet 18 is connected with the condensate treatment device 9 through a pipeline. The cold end import of refrigerated water cooler 4 links to each other with refrigerated water inlet pipe network 15, and the cold end export of refrigerated water cooler 4 links to each other with refrigerated water outlet pipe network 16. The floating valve tower tray 5 is 2-4 layers. The gas distribution cap component comprises a partition plate 23 connected with the wall of the ammonia washing tower, a hole 24 is formed in the middle of the partition plate, a cylinder 25 matched with the hole 24 is arranged at the top of the partition plate 23 on the outer side of the hole 24, and a gas cap 6 enabling the ammonia washing section and the pre-washing analysis section to be communicated is arranged at the top of the cylinder 25; the pre-wash analysis condensate outlet 21 is disposed at a height no greater than the height of the cylinder 25. The desalinated water inlet 20 is connected to the desalinated water network 12 via a valve 26.
An anti-corrosion shift gas ammonia washing device comprises a pre-process shift gas pipeline 1, wherein the pre-process shift gas pipeline 1 is connected with a shift gas inlet 17 of an ammonia washing tower 3 through a shell pass of a water cooler 2. And the tube side inlet of the water cooler 2 is connected with a circulating water inlet pipe network 13, and the tube side outlet of the water cooler 2 is connected with a circulating water outlet pipe network 14. And a transformation gas outlet 19 of the ammonia washing tower 3 is connected with the low-temperature methanol washing section 8 through a gas-phase ammonia content analyzer 7.
The invention also provides a process of the anti-corrosion ammonia conversion and gas washing device, which comprises the following steps:
step 1: the ammonia-containing shift gas in the shift gas pipeline 1 in the previous process is cooled through the shell pass of the water cooler 2 and then enters a flash evaporation section of the ammonia washing tower 3 through a shift gas inlet 17; the temperature of the ammonia-containing shift gas is 70-90 ℃, and the ammonia content is 0.015-0.030%; the temperature of the ammonia-containing shift gas passing through the shell pass of the water cooler 2 is 30-40 ℃; circulating water in the circulating water inlet pipe network 13 in the process of exchanging heat with the ammonia-containing shift gas passes through the pipe pass of the water-water cooler 2 and then enters the circulating water outlet pipe network 14;
step 2: the converted gas enters a flash evaporation section of the ammonia washing tower 3 for flash evaporation, and flash evaporation condensate enters a condensate treatment device 9 for treatment through a flash evaporation condensate outlet 18 at the bottom of the ammonia washing tower 3; the flash evaporation gas upwards runs and enters a cooling section;
and step 3: the flash evaporation gas is cooled to 10-20 ℃ in a cooling section by a chilled water cooler 4, and the solubility of ammonia in the flash evaporation gas can be improved after the flash evaporation gas is cooled; in the cooling process, the chilled water in the chilled water inlet pipe network 15 enters the chilled water outlet pipe network 16 after exchanging heat with flash evaporation gas in the chilled water cooler 4;
and 4, step 4: the cooled flash steam continuously ascends to enter an ammonia washing section; the ammonia washing section is fed with prewashing analysis condensate in the prewashing analysis section through a condensate pump 10; the ratio of the amount of the prewashing analysis condensate to the flow of the converted gas entering the ammonia washing section is 1kg: 200-400 Nm 3; the pH value of the prewashing analysis condensate is 6.0-7.2, and the ammonia nitrogen content is 562-782 ppm;
the efficiency of dissolving ammonia in the prewashing analysis condensate is improved by improving the solubility of ammonia in flash steam and reducing the consumption of the prewashing analysis condensate, and the ammonia is uniformly distributed in a plurality of layers of floating valve trays 5, so that the prewashing analysis condensate can be enough dissolved in each layer of floating valve trays 5 to neutralize carbon dioxide and hydrogen sulfide dissolved in the prewashing analysis condensate, and the pH value of the prewashing analysis condensate after the ammonia washing section is 6.5-7.2, thereby realizing the purpose of preventing the ammonia washing tower 3 and internal parts thereof from being corroded;
and 5: the prewashing analysis condensate after the ammonia washing section enters a flash evaporation section and then enters a condensate treatment device 9 for treatment through a flash evaporation condensate outlet 18 at the bottom of the ammonia washing tower 3;
step 6: the flash gas passing through the ammonia washing section continuously goes upward to pass through a gas cap 6 to enter a pre-washing analysis section, and enters a low-temperature methanol washing section 8 through a shifted gas outlet 19 and a gas-phase ammonia content analyzer 7 after being absorbed by desalted water; a gas-phase ammonia content analyzer 7 for analyzing the gas-phase ammonia content of the gas phase passing through the prewashing analysis section to be 1-10 ppm;
and 7: and (4) when the pH value of the pre-washing analysis condensate entering the ammonia washing section in the step (4) is less than 6.0, reducing the frequency of the condensate pump 10 to reduce the amount of the pre-washing analysis condensate entering the ammonia washing section until the pH value of the pre-washing analysis condensate is not less than 6.0.
Example 7
An ammonia washing tower 3 sequentially comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top; a conversion gas inlet 17 is formed in one side of the flash evaporation section, and a flash evaporation condensate outlet 18 is formed in the bottom of the flash evaporation section; the cooling section comprises a chilled water cooler 4 for cooling the shift gas and improving the solubility of the gas ammonia; the ammonia washing section comprises a plurality of layers of float valve trays 5 and an air distribution cap assembly arranged on the tops of the float valve trays 5; the top of the pre-washing analysis section is provided with a shifted gas outlet 19, the upper part of one side of the pre-washing analysis section is provided with a desalted water inlet 20, the wall of the ammonia washing tower on one side of the upper part of the gas distribution cap component is provided with a pre-washing analysis condensate outlet 21, and the wall of the ammonia washing tower of the top-layer floating valve tower tray 5 and the gas distribution cap component is provided with a pre-washing analysis condensate inlet 22; a condensate pump 10 and a liquid-phase ammonia content analyzer 11 are arranged between the prewashing analysis condensate outlet 21 and the prewashing analysis condensate inlet 22. The flash evaporation condensate outlet 18 is connected with the condensate treatment device 9 through a pipeline. The cold end import of refrigerated water cooler 4 links to each other with refrigerated water inlet pipe network 15, and the cold end export of refrigerated water cooler 4 links to each other with refrigerated water outlet pipe network 16. The floating valve tower tray 5 is 2-4 layers. The gas distribution cap component comprises a partition plate 23 connected with the wall of the ammonia washing tower, a hole 24 is formed in the middle of the partition plate, a cylinder 25 matched with the hole 24 is arranged at the top of the partition plate 23 on the outer side of the hole 24, and a gas cap 6 enabling the ammonia washing section and the pre-washing analysis section to be communicated is arranged at the top of the cylinder 25; the pre-wash analysis condensate outlet 21 is disposed at a height no greater than the height of the cylinder 25. The desalinated water inlet 20 is connected to the desalinated water network 12 via a valve 26.
An anti-corrosion shift gas ammonia washing device comprises a pre-process shift gas pipeline 1, wherein the pre-process shift gas pipeline 1 is connected with a shift gas inlet 17 of an ammonia washing tower 3 through a shell pass of a water cooler 2. And the tube side inlet of the water cooler 2 is connected with a circulating water inlet pipe network 13, and the tube side outlet of the water cooler 2 is connected with a circulating water outlet pipe network 14. And a transformation gas outlet 19 of the ammonia washing tower 3 is connected with the low-temperature methanol washing section 8 through a gas-phase ammonia content analyzer 7.
The invention also provides a process of the anti-corrosion ammonia conversion and gas washing device, which comprises the following steps:
step 1: the ammonia-containing shift gas in the shift gas pipeline 1 in the previous process is cooled through the shell pass of the water cooler 2 and then enters a flash evaporation section of the ammonia washing tower 3 through a shift gas inlet 17; the temperature of the ammonia-containing shift gas is 70-90 ℃, and the ammonia content is 0.015-0.030%; the temperature of the ammonia-containing shift gas passing through the shell pass of the water cooler 2 is 30-40 ℃; circulating water in the circulating water inlet pipe network 13 in the process of exchanging heat with the ammonia-containing shift gas passes through the pipe pass of the water-water cooler 2 and then enters the circulating water outlet pipe network 14;
step 2: the converted gas enters a flash evaporation section of the ammonia washing tower 3 for flash evaporation, and flash evaporation condensate enters a condensate treatment device 9 for treatment through a flash evaporation condensate outlet 18 at the bottom of the ammonia washing tower 3; the flash evaporation gas upwards runs and enters a cooling section;
and step 3: the flash evaporation gas is cooled to 10-20 ℃ in a cooling section by a chilled water cooler 4, and the solubility of ammonia in the flash evaporation gas can be improved after the flash evaporation gas is cooled; in the cooling process, the chilled water in the chilled water inlet pipe network 15 enters the chilled water outlet pipe network 16 after exchanging heat with flash evaporation gas in the chilled water cooler 4;
and 4, step 4: the cooled flash steam continuously ascends to enter an ammonia washing section; the ammonia washing section is fed with prewashing analysis condensate in the prewashing analysis section through a condensate pump 10; the ratio of the amount of the prewashing analysis condensate to the flow of the converted gas entering the ammonia washing section is 1kg: 200-400 Nm 3; the pH value of the prewashing analysis condensate is 6.0-7.2, and the ammonia nitrogen content is 562-782 ppm;
the efficiency of dissolving ammonia in the prewashing analysis condensate is improved by improving the solubility of ammonia in flash steam and reducing the consumption of the prewashing analysis condensate, and the ammonia is uniformly distributed in a plurality of layers of floating valve trays 5, so that the prewashing analysis condensate can be enough dissolved in each layer of floating valve trays 5 to neutralize carbon dioxide and hydrogen sulfide dissolved in the prewashing analysis condensate, and the pH value of the prewashing analysis condensate after the ammonia washing section is 6.5-7.2, thereby realizing the purpose of preventing the ammonia washing tower 3 and internal parts thereof from being corroded;
and 5: the prewashing analysis condensate after the ammonia washing section enters a flash evaporation section and then enters a condensate treatment device 9 for treatment through a flash evaporation condensate outlet 18 at the bottom of the ammonia washing tower 3;
step 6: the flash gas passing through the ammonia washing section continuously goes upward to pass through a gas cap 6 to enter a pre-washing analysis section, and enters a low-temperature methanol washing section 8 through a shifted gas outlet 19 and a gas-phase ammonia content analyzer 7 after being absorbed by desalted water; a gas-phase ammonia content analyzer 7 for analyzing the gas-phase ammonia content of the gas phase passing through the prewashing analysis section to be 1-10 ppm;
and 7: when the pH value of the pre-washing analysis condensate entering the ammonia washing section in the step 4 is less than 6.0, reducing the frequency of a condensate pump 10 to reduce the amount of the pre-washing analysis condensate entering the ammonia washing section until the pH value of the pre-washing analysis condensate is not less than 6.0;
and 8: when the content of the gaseous ammonia in the step 6 is more than 10ppm, the opening degree of the valve 26 is increased so as to increase the amount of the desalted water entering the prewashing analysis section for absorbing the redundant ammonia until the content of the gaseous ammonia is not more than 10 ppm.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. An ammonia washing tower is characterized in that: the ammonia washing tower (3) sequentially comprises a flash evaporation section, a cooling section, an ammonia washing section and a prewashing analysis section from bottom to top;
a conversion gas inlet (17) is formed in one side of the flash evaporation section, and a flash evaporation condensate outlet (18) is formed in the bottom of the flash evaporation section;
the cooling section comprises a chilled water cooler (4) for cooling the shift gas and improving the solubility of the gas ammonia;
the ammonia washing section comprises a plurality of layers of float valve trays (5) and a gas distribution cap assembly arranged at the tops of the float valve trays (5);
the top of the prewashing analysis section is provided with a shifted gas outlet (19), the upper part of one side of the prewashing analysis section is provided with a desalted water inlet (20), the wall of the ammonia washing tower on one side of the upper part of the gas distribution cap component is provided with a prewashing analysis condensate outlet (21), and the wall of the ammonia washing tower of the top-layer floating valve tower tray (5) and the gas distribution cap component is provided with a prewashing analysis condensate inlet (22); a condensate pump (10) and a liquid-phase ammonia content analyzer (11) are arranged between the prewashing analysis condensate outlet (21) and the prewashing analysis condensate inlet (22).
2. An ammonia scrubber as defined in claim 1, wherein: and the flash evaporation condensate outlet (18) is connected with a condensate treatment device (9) through a pipeline.
3. An ammonia scrubber as defined in claim 1, wherein: the cold end inlet of the freezing water cooler (4) is connected with the freezing water inlet pipe network (15), and the cold end outlet of the freezing water cooler (4) is connected with the freezing water outlet pipe network (16).
4. An ammonia scrubber as defined in claim 1, wherein: the floating valve tower tray (5) is 2-4 layers.
5. An ammonia scrubber as defined in claim 1, wherein: the gas distribution cap component comprises a partition plate (23) connected with the wall of the ammonia washing tower, a hole (24) is formed in the middle of the partition plate, a cylinder (25) matched with the hole (24) is arranged at the top of the partition plate (23) on the outer side of the hole (24), and a gas cap (6) enabling the ammonia washing section to be communicated with the pre-washing analysis section is arranged at the top of the cylinder (25);
the setting height of the prewashing analysis condensate outlet (21) is not higher than that of the cylinder (25).
6. An ammonia scrubber as defined in claim 1, wherein: the desalinated water inlet (20) is connected to a desalinated water network (12) via a valve (26).
7. An anti-corrosion ammonia conversion and gas washing device comprises a pre-process conversion and gas pipeline (1), and is characterized in that: the pre-process shift gas pipeline (1) is connected with a shift gas inlet (17) of the ammonia scrubber (3) as claimed in any one of claims 1 to 6 through a water cooler (2) shell side.
8. The anti-corrosion shift gas ammonia scrubber according to claim 7, wherein: and a tube side inlet of the water cooler (2) is connected with a circulating water inlet pipe network (13), and a tube side outlet of the water cooler (2) is connected with a circulating water outlet pipe network (14).
9. The anti-corrosion shift gas ammonia scrubber according to claim 7, wherein: and a conversion gas outlet (19) of the ammonia washing tower (3) is connected with the low-temperature methanol washing section (8) through a gas-phase ammonia content analyzer (7).
10. A process for corrosion protected shift gas ammonia scrubber apparatus according to claims 6-9, characterized by: the process comprises the following steps:
step 1: ammonia-containing shift gas in the shift gas pipeline (1) in the previous process is cooled through the shell pass of the water cooler (2) and then enters a flash evaporation section of the ammonia washing tower (3) through a shift gas inlet (17); the temperature of the ammonia-containing shift gas is 70-90 ℃, and the ammonia content is 0.015-0.030%; the temperature of ammonia-containing shift gas passing through the shell pass of the water cooler (2) is 30-40 ℃; circulating water in the circulating water inlet pipe network (13) in the process of exchanging heat with ammonia-containing shift gas enters the circulating water outlet pipe network (14) after passing through the pipe pass of the water-water cooler (2);
step 2: the converted gas enters a flash evaporation section of the ammonia washing tower (3) for flash evaporation, and flash evaporation condensate enters a condensate treatment device (9) for treatment through a flash evaporation condensate outlet (18) at the bottom of the ammonia washing tower (3); the flash evaporation gas upwards runs and enters a cooling section;
and step 3: the flash evaporation gas is cooled to 10-20 ℃ in a cooling section by a chilled water cooler (4), and the solubility of ammonia in the flash evaporation gas can be improved after the flash evaporation gas is cooled; in the cooling process, the chilled water in the chilled water inlet pipe network (15) enters the chilled water outlet pipe network (16) after exchanging heat with flash evaporation gas in the chilled water cooler (4);
and 4, step 4: the cooled flash steam continuously ascends to enter an ammonia washing section; the ammonia washing section is fed with pre-washing analysis condensate in the pre-washing analysis section through a condensate pump (10); the ratio of the amount of the prewashing analysis condensate to the flow of the converted gas entering the ammonia washing section is 1kg: 200-400 Nm3(ii) a The pH value of the prewashing analysis condensate is 6.0-7.2, and the ammonia nitrogen content is 562-782 ppm;
the efficiency of dissolving ammonia gas in the prewashing analysis condensate is improved by improving the solubility of ammonia gas in flash evaporation gas and reducing the using amount of the prewashing analysis condensate, and the ammonia gas is uniformly distributed in a plurality of layers of floating valve trays (5), so that the prewashing analysis condensate can be dissolved with enough ammonia gas in each layer of floating valve trays (5) and is used for neutralizing carbon dioxide and hydrogen sulfide dissolved in the prewashing analysis condensate, and the pH value of the prewashing analysis condensate after the ammonia washing section is discharged is 6.5-7.2, thereby realizing the purpose of preventing the ammonia washing tower (3) and internal parts thereof from being corroded;
and 5: the prewashing analysis condensate after the ammonia washing section enters a flash evaporation section and then enters a condensate treatment device (9) for treatment through a flash evaporation condensate outlet (18) at the bottom of the ammonia washing tower (3);
step 6: the flash gas passing through the ammonia washing section continuously goes upward to pass through a gas cap (6) to enter a prewashing analysis section, and enters a low-temperature methanol washing section (8) through a shift gas outlet (19) and a gas-phase ammonia content analyzer (7) after being absorbed by desalted water; a gas-phase ammonia content analyzer (7) analyzes that the gas-phase ammonia content passing through the prewashing analysis section is 1-10 ppm;
and 7: when the pH value of the pre-washing analysis condensate entering the ammonia washing section in the step 4 is less than 6.0, reducing the frequency of a condensate pump (10) to reduce the amount of the pre-washing analysis condensate entering the ammonia washing section until the pH value of the pre-washing analysis condensate is not less than 6.0;
and 8: when the content of the gaseous ammonia in the step 6 is more than 10ppm, the opening degree of the valve (26) is adjusted to increase the amount of desalted water entering the prewashing analysis section for absorbing the redundant ammonia until the content of the gaseous ammonia is not more than 10 ppm.
CN202011247744.5A 2020-11-10 2020-11-10 Ammonia washing tower, and anti-corrosion conversion gas ammonia washing device and process using same Pending CN112246075A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011247744.5A CN112246075A (en) 2020-11-10 2020-11-10 Ammonia washing tower, and anti-corrosion conversion gas ammonia washing device and process using same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011247744.5A CN112246075A (en) 2020-11-10 2020-11-10 Ammonia washing tower, and anti-corrosion conversion gas ammonia washing device and process using same

Publications (1)

Publication Number Publication Date
CN112246075A true CN112246075A (en) 2021-01-22

Family

ID=74265330

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011247744.5A Pending CN112246075A (en) 2020-11-10 2020-11-10 Ammonia washing tower, and anti-corrosion conversion gas ammonia washing device and process using same

Country Status (1)

Country Link
CN (1) CN112246075A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113913217A (en) * 2021-11-22 2022-01-11 陕西聚能新创煤化科技有限公司 Gasification shift dissolved gas recovery method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113913217A (en) * 2021-11-22 2022-01-11 陕西聚能新创煤化科技有限公司 Gasification shift dissolved gas recovery method and system
CN113913217B (en) * 2021-11-22 2022-06-07 陕西聚能新创煤化科技有限公司 Gasification shift dissolved gas recovery method and system

Similar Documents

Publication Publication Date Title
CN107741103B (en) Ammonia water absorption type refrigeration combined carbon trapping device
CN102061197B (en) Coke oven gas desulfuration and deamination combined purifying method and special device thereof
CN102463022B (en) Method and apparatus for absorbing asphalt smoke
CN113669175B (en) Low-temperature desublimated carbon capture system and method for tail gas of marine natural gas engine
JP7461679B2 (en) System and method for VOCs recovery that integrates absorption, desorption and recovery
CN104474849A (en) Acid regeneration acid gas absorption and exhaust emission reduction system and utilization method thereof
CN112246075A (en) Ammonia washing tower, and anti-corrosion conversion gas ammonia washing device and process using same
CN201990641U (en) Special device for coke oven gas desulfuration and deamination combined purification method
CN213590104U (en) Ammonia washing tower and anti-corrosion conversion gas ammonia washing device using same
CN116445196B (en) Method and device for efficiently regenerating amine liquid of coupling heat pump
CN104607014B (en) Energy-saving process for heating tail gas by using surplus steam
US20230373801A1 (en) Multi-stage ammonia-based decarbonization
CN113528196B (en) Shifted gas treatment or improvement process and low-temperature methanol washing device and process
CN111036040A (en) Condensation-adsorption integrated VOCs recycling system and recycling process
CN104528660B (en) A kind of energy saving technique utilizing waste heat tail gas
CN104987896A (en) Acidic gas condensation-cooling process and device for vacuum potassium carbonate desulphuration
CN216878619U (en) A prevent air resistance system that is used for low temperature methyl alcohol to wash methyl alcohol scrubbing tower region
CN209519565U (en) Multistage crossing current absorption tower
CN113566226A (en) Secondary refrigerant dehydration system and dehydration method for removing low-temperature pollutants in flue gas
CN215939524U (en) Device is washed to anhydrous type low temperature methyl alcohol
CN111957166A (en) High condensation point waste gas recovery device and recovery method
CN111530240A (en) Low-temperature desulfurization device
CN107008107B (en) Comprehensive treatment method and treatment device for waste gas in benzyl alcohol production
CN205115045U (en) Improve ore deposit or smelt device of sour low temperature heat recovery of flue gas sulfur production
CN220413287U (en) Methane purifying device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination