CN112892509A - Sulfur-carrying active coke fluidized regeneration tower, regeneration system and regeneration method - Google Patents
Sulfur-carrying active coke fluidized regeneration tower, regeneration system and regeneration method Download PDFInfo
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- CN112892509A CN112892509A CN202110075226.8A CN202110075226A CN112892509A CN 112892509 A CN112892509 A CN 112892509A CN 202110075226 A CN202110075226 A CN 202110075226A CN 112892509 A CN112892509 A CN 112892509A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3483—Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
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- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
Abstract
The invention discloses a fluidized regeneration tower, a regeneration system and a regeneration method of sulfur-loaded active coke, wherein the sulfur-loaded active coke enters the fluidized regeneration tower after being preheated and dehydrated by high-temperature gas and falls to the upper part of a fluidized air distribution device through a discharging pipe; introducing fluidizing air below the fluidized air distribution device to fluidize the sulfur-loaded active coke above the fluidized air distribution device, and simultaneously introducing high-temperature flue gas into the heat exchange pipe to heat and regenerate the sulfur-loaded active coke; the regenerated active coke enters the second coke breeze preheating cyclone separator component under the carrying of clean flue gas, the separation is carried out after direct heat exchange, the regenerated and cooled active coke is collected and stored, the heated clean flue gas carries the sulfur-carrying active coke to the first coke breeze preheating cyclone separator component to preheat the sulfur-carrying active coke for water removal, and the gas-solid separation is carried out.
Description
Technical Field
The invention belongs to the technical field of regeneration of sulfur-bearing active coke, and particularly relates to a fluidized regeneration tower, a regeneration system and a regeneration method of sulfur-bearing active coke.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
SO2NOx, soot, and the like, have been studied by numerous researchers as major pollutants of the atmosphere. Wherein SO2The treatment is particularly important, and the industrial treatment of SO is carried out according to the water consumption in the flue gas desulfurization process2The method mainly comprises wet method, semi-dry method and dry method desulfurization technology. The active coke/carbon prepared by taking coal as a raw material has strong adsorption capacity for harmful substances in flue gas, wherein the active coke/carbon comprises rich pore structures on the surfaces and inside of particles and has more active adsorption sites in the pore structures, and the active coke/carbon comprises SO2NOx, and toxic gaseous substances such as VOCs and dioxins; and the flue gas is purified by using the activated coke/carbon, and meanwhile, the method has the advantages of no water consumption, no secondary pollutant generation, recyclable adsorbent and the like, and is gradually used in industrial application. The regeneration of the active coke/carbon with saturated adsorption mainly relates to the recycling of a desulfurizer and the resource treatment and application of the gas to be analyzed, and is one of the key technologies of the whole system. But currently, the regeneration of the active coke/carbon only utilizes an indirect heat exchange mode to carry out desulfurization activityThe coke is heated to a certain temperature to regenerate the active coke, and the regeneration mode has the defects of high energy consumption, large regeneration equipment and the like.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a fluidized regeneration tower, a regeneration system and a regeneration method for sulfur-bearing active coke.
To solve the above technical problem, one or more of the following embodiments of the present invention provide the following technical solutions:
in a first aspect, the invention provides a fluidized regeneration tower for sulfur-bearing active coke, which comprises a shell, and a fluidized air distribution device, a heat exchange tube assembly and a blanking tube assembly which are arranged in the shell;
the fluidization air distribution device is at least one in number and is arranged on the cross section of the shell at the set height; each fluidized air distribution device comprises a finned heat exchange tube assembly and a material cone assembly, the finned heat exchange tubes comprise heat exchange tube bodies and heat exchange fins radially arranged on the outer sides of the heat exchange tube bodies, and a plurality of finned heat exchange tubes are tiled and arranged on the cross section of the shell at intervals in a set distance;
the material cone is a bent plate body, the material cone assembly is arranged above the heat exchange tube assembly with the fins, the tip end of the material cone assembly is upward, and two wings of the material cone assembly are matched with the fins of two adjacent heat exchange tubes with the fins to form a fluidized air flow channel;
the heat exchange pipe assembly is arranged above the fluidized air distribution device;
the blanking pipe is vertically arranged on one side of the shell, the upper end of the blanking pipe is positioned above the fluidized air distribution device, and the lower end of the blanking pipe is positioned below the fluidized air distribution device.
In a second aspect, the invention provides a sulfur-loaded active coke regeneration system, which comprises the fluidized state regeneration tower, a first coke breeze preheating cyclone separator component and a second coke breeze preheating cyclone separator component, wherein the first coke breeze preheating cyclone separator component is arranged at the solid inlet end of the fluidized state regeneration tower and is used for being connected with a sulfur-loaded active coke source; and the second coke breeze preheating cyclone separator component is arranged at the solid outlet end of the fluidized state regeneration tower and is used for being connected with the regenerated coke breeze storage bin.
In a third aspect, the invention provides a method for regenerating sulfur-bearing active coke, which comprises the following steps:
after being preheated and dehydrated by high-temperature gas, the sulfur-loaded active coke enters a fluidized regeneration tower and falls to the upper part of a fluidized air distribution device through a discharge pipe;
introducing fluidizing air below the fluidized air distribution device to fluidize the sulfur-loaded active coke above the fluidized air distribution device, introducing high-temperature flue gas into the heat exchange pipe, wherein the flowing directions of the flue gas and the active coke are opposite, so that the heat exchange efficiency is improved, and the sulfur-loaded active coke is heated and regenerated;
the regenerated active coke enters the second coke breeze preheating cyclone separator component under the carrying of clean flue gas, the separation is carried out after direct heat exchange, the regenerated and cooled active coke is collected and stored, the heated clean flue gas carries the sulfur-carrying active coke to the first coke breeze preheating cyclone separator component to preheat and remove water from the sulfur-carrying active coke, and the steps are circulated.
Compared with the prior art, one or more technical schemes of the invention have the following beneficial effects:
the invention controls the temperatures in the coke breeze preheating cyclone group, the coke breeze cooling cyclone group and the fluidization regeneration tower according to the temperature condition required by the regeneration process of the powdery active coke adsorption material, so that the desorption regeneration process can run efficiently, safely and stably. According to the characteristics of raising and lowering the temperature of the powdered coke, the preheating and dehydration of the sulfur-carrying powdered coke are completed by using the waste heat of the powdered coke, the economical efficiency of the system is improved, the volume of a regenerating device is reduced, and the method has wide application prospect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a fluidized bed desorption and gas-powder cyclone heat exchange separation system for powdered activated coke in example 1 of the present invention;
FIG. 2 is a schematic structural diagram of a fluidized bed desorption and gas-powder cyclone heat exchange separation system for powdered activated coke in example 2 of the present invention;
FIG. 3 is a schematic diagram of the arrangement of heat exchange tubes and the arrangement structure of a blanking tube in the desorption tower according to the embodiment of the invention;
fig. 4 is a schematic structural view of a fluidized bed air distribution device according to an embodiment of the present invention.
The device comprises a sulfur-carrying coke breeze bin 1, a first coke breeze preheating cyclone separator component 2, a fluidization regeneration tower 3, a gas-gas heat exchanger 4, a second coke breeze preheating cyclone separator component 5, a regenerated coke breeze storage bin 6, a coke breeze interface 7, a coke breeze interface 8, a blanking pipe 9, a shell 10, a fluidization air distribution device 11, a heat exchange pipe 12, a heat exchange pipe with fins 13 and a material cone.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In a first aspect, the invention provides a fluidized regeneration tower for sulfur-bearing active coke, which comprises a shell, and a fluidized air distribution device, a heat exchange tube assembly and a blanking tube assembly which are arranged in the shell;
the fluidization air distribution device is at least one in number and is arranged on the cross section of the shell at the set height; each fluidized air distribution device comprises a finned heat exchange tube assembly and a material cone assembly, the finned heat exchange tubes comprise heat exchange tube bodies and heat exchange fins radially arranged on the outer sides of the heat exchange tube bodies, and a plurality of finned heat exchange tubes are tiled and arranged on the cross section of the shell at intervals in a set distance;
the material cone is a bent plate body, the material cone assembly is arranged above the heat exchange tube assembly with the fins, the tip end of the material cone assembly is upward, and two wings of the material cone assembly are matched with the fins of two adjacent heat exchange tubes with the fins to form a fluidized air flow channel;
the heat exchange pipe assembly is arranged above the fluidized air distribution device;
the blanking pipe is vertically arranged on one side of the shell, the upper end of the blanking pipe is positioned above the fluidized air distribution device, and the lower end of the blanking pipe is positioned below the fluidized air distribution device.
The two wings of the material cone which are bent downwards and fluidized air flow channels formed by matching the fins on the two sides are arranged obliquely downwards, fluidized air flows through the two oblique downward flow channels, is collected at the top of the heat exchange tube with the fins to blow up the active coke at the top, and continues to flow upwards, so that the active coke above the fluidized air distribution device can be blown up to be fluidized.
Meanwhile, when a heating medium is introduced into the heat exchange tube body with the finned heat exchange tube, the fluidized gas can be heated, the fins arranged in a radial mode can accelerate the heating efficiency of the fluidized gas, and when the heated fluidized gas fluidizes the active coke, the regeneration effect of the sulfur-loaded active coke can be effectively improved.
In some embodiments, the number of fins on the finned heat exchange tube is 2-4.
In some embodiments, the heat exchange tube assemblies are arranged along the horizontal direction and are respectively connected with the high-temperature flue gas source.
In some embodiments, two adjacent blanking tubes are disposed on opposite sides of the shell. The active coke is conveniently and uniformly distributed on each fluidized air distribution device.
In a second aspect, the invention provides a sulfur-loaded active coke regeneration system, which comprises the fluidized state regeneration tower, a first coke breeze preheating cyclone separator component and a second coke breeze preheating cyclone separator component, wherein the first coke breeze preheating cyclone separator component is arranged at the solid inlet end of the fluidized state regeneration tower and is used for being connected with a sulfur-loaded active coke source; and the second coke breeze preheating cyclone separator component is arranged at the solid outlet end of the fluidized state regeneration tower and is used for being connected with the regenerated coke breeze storage bin.
In some embodiments, the system further comprises a gas-gas heat exchanger, wherein the inlet of one flow path of the gas-gas heat exchanger is connected with the tower top gas outlet of the fluidized state regeneration tower, and the outlet of the flow path of the gas-gas heat exchanger is connected with the tower bottom gasified gas inlet of the fluidized state regeneration tower;
the inlet of the other flow path of the gas-gas heat exchanger is connected with the outlet of the heat exchanger.
After the high-temperature flue gas introduced into the fluidized state regeneration tower heats and regenerates the sulfur-bearing active coke, the temperature is still higher, the flue gas with higher temperature is used for heating the desorption gas, and the heated part of the desorption gas is circulated back into the fluidized state regeneration tower as the fluidized gas, so that the regeneration efficiency of the sulfur-bearing active coke is improved, and the energy can be effectively saved.
In some embodiments, the cyclones in the first and second coke breeze preheating cyclone assemblies are vertical cyclones or horizontal cyclones.
Among them, the horizontal cyclone separator is an axial cyclone separator suitable for gas-solid two-phase separation as described in zl201721131637.X and CN 201710792067.7.
Further, the first coke breeze preheating cyclone separator component comprises a first cyclone separator, a second cyclone separator and a third cyclone separator, wherein the clean flue gas conveying pipeline is sequentially connected with a second cyclone separator solid outlet, a third cyclone separator material inlet, a third cyclone separator gas phase outlet, a first cyclone separator solid outlet, a second cyclone separator material inlet, a second cyclone separator gas phase outlet, a sulfur-carrying coke breeze bin outlet, a first cyclone separator material inlet and a first cyclone separator gas phase outlet;
and a solid outlet of the third cyclone separator is connected with a material inlet of the fluidization regeneration tower.
The second coke breeze preheating cyclone assembly is the same as the first coke breeze preheating cyclone assembly in structure and flow direction of the clean flue gas.
In a third aspect, the invention provides a method for regenerating sulfur-bearing active coke, which comprises the following steps:
after being preheated and dehydrated by high-temperature gas, the sulfur-loaded active coke enters a fluidized regeneration tower and falls to the upper part of a fluidized air distribution device through a discharge pipe;
introducing fluidizing air below the fluidized air distribution device to fluidize the sulfur-loaded active coke above the fluidized air distribution device, introducing high-temperature flue gas into the heat exchange pipe, wherein the flowing directions of the flue gas and the active coke are opposite, so that the heat exchange efficiency is improved, and the sulfur-loaded active coke is heated and regenerated;
the regenerated active coke enters the second coke breeze preheating cyclone separator component under the carrying of clean flue gas, the separation is carried out after direct heat exchange, the regenerated and cooled active coke is collected and stored, the heated clean flue gas carries the sulfur-carrying active coke to the first coke breeze preheating cyclone separator component to preheat and remove water from the sulfur-carrying active coke, and the steps are circulated.
In some embodiments, the temperature of the preheated sulfur-loaded activated coke is 150-220 ℃.
In some embodiments, the temperature of the sulfur-loaded activated coke after heating in the fluidized-state regeneration tower is 400-550 ℃.
Further, the temperature of the high-temperature flue gas for heating the sulfur-carrying active coke is 600-800 ℃.
In some embodiments, the temperature of the desorption gas flowing out of the top of the fluidization regeneration tower after being heated by the flue gas is 300-500 ℃, and the heated part of the desorption gas is used as the fluidization gas to circularly flow back to the fluidization regeneration tower.
Example 1
As shown in fig. 3 and 4, a fluidized regeneration tower for sulfur-loaded active coke comprises a shell 9, and a fluidized air distribution device 10, a heat exchange tube assembly and a blanking tube assembly which are arranged inside the shell 9; wherein, the number of the fluidization wind distribution devices 10 is at least one, and the fluidization wind distribution devices are arranged on the cross section of the shell 9 at the set height; each fluidized air distribution device 10 comprises a finned heat exchange tube assembly and a material cone assembly, each finned heat exchange tube 12 comprises a heat exchange tube body and heat exchange fins radially arranged on the outer side of the heat exchange tube body, and a plurality of finned heat exchange tubes are tiled and arranged on the cross section of the shell at intervals; the material cone 13 is a bent plate body, the material cone assembly is arranged above the heat exchange tube assembly with the fins, the tip end of the material cone assembly is upward, and two wings of the material cone assembly are matched with the fins of two adjacent heat exchange tubes with the fins to form a fluidized air flow channel; the heat exchange pipe assembly is arranged above the fluidized air distribution device 10; the blanking pipe 8 is vertically arranged at one side of the shell 9, the upper end of the blanking pipe is positioned above a fluidized air distribution device 10, and the lower end of the blanking pipe is positioned below the fluidized air distribution device 10.
The two downward bent wings of the material cone 13 and the two side fins are matched to form a fluidized air flow channel which is arranged obliquely downwards, fluidized air flows through the two oblique downward flow channels, is collected at the top of the heat exchange tube with the fins, blows active coke at the top, and continues to flow upwards, so that the active coke above the fluidized air distribution device can be blown up to be fluidized. Meanwhile, when a heating medium is introduced into the heat exchange tube body with the finned heat exchange tube, the fluidized gas can be heated, the fins arranged in a radial mode can accelerate the heating efficiency of the fluidized gas, and when the heated fluidized gas fluidizes the active coke, the regeneration effect of the sulfur-loaded active coke can be effectively improved.
The number of the fins on the heat exchange tube 12 with the fins is 4, and two fins are respectively matched with the bent wings of the two material cones 13.
The heat exchange pipes in the heat exchange pipe assembly are arranged along the horizontal direction and are respectively connected with the high-temperature flue gas source.
Two adjacent blanking pipes 8 are respectively arranged at two opposite sides of the shell 9. So that the active coke is uniformly distributed on each fluidized air distribution device 10.
Example 2
As shown in fig. 1, a sulfur-loaded active coke regeneration system comprises the fluidized state regeneration tower 3, a first coke breeze preheating cyclone separator assembly 2 and a second coke breeze preheating cyclone separator assembly 5, wherein the first coke breeze preheating cyclone separator assembly 2 is arranged at the solid inlet end of the fluidized state regeneration tower 3 and is used for being connected with a sulfur-loaded coke breeze bin 1; and the second coke breeze preheating cyclone separator component 5 is arranged at the solid outlet end of the fluidized state regeneration tower 3 and is used for being connected with the regenerated coke breeze storage bin 6.
The inlet of one flow path of the gas-gas heat exchanger 4 is connected with the gas outlet at the top of the fluidized state regeneration tower 3, and the outlet is connected with the gas inlet at the bottom of the fluidized state regeneration tower 3; the inlet of the other flow path of the gas-gas heat exchanger 4 is connected with the outlet of the heat exchanger 11.
After the high-temperature flue gas introduced into the fluidized state regeneration tower 3 heats and regenerates the sulfur-bearing active coke, the temperature is higher, the flue gas with higher temperature is used for heating the desorption gas, and the heated part of the desorption gas is circulated back into the fluidized state regeneration tower as the fluidized gas, so that the regeneration efficiency of the sulfur-bearing active coke is improved, and the energy can be effectively saved.
The cyclones in the first and second coke breeze preheating cyclone assemblies 2 and 5 are conventional vertical cyclones.
The first coke breeze preheating cyclone separator component comprises a first cyclone separator, a second cyclone separator and a third cyclone separator, wherein the clean flue gas conveying pipeline is sequentially connected with a second cyclone separator solid outlet, a third cyclone separator material inlet, a third cyclone separator gas phase outlet, a first cyclone separator solid outlet, a second cyclone separator material inlet, a second cyclone separator gas phase outlet, a sulfur-carrying coke breeze bin outlet, a first cyclone separator material inlet and a first cyclone separator gas phase outlet;
and a solid outlet of the third cyclone separator is connected with a material inlet of the fluidization regeneration tower.
The second coke breeze preheating cyclone assembly is the same as the first coke breeze preheating cyclone assembly in structure and flow direction of the clean flue gas.
Example 3
Only the conventional vertical cyclone in the first and second coke breeze preheating cyclone assemblies 2 and 5 in example 2 was replaced with a horizontal cyclone, which is an axial cyclone suitable for gas-solid two-phase separation described in zl201721131637.x and CN 201710792067.7.
Example 4
The regeneration method of the sulfur-carrying active coke comprises the following steps:
after the powdery active coke adsorbing material is adsorbed in the adsorption tower, the powdery active coke adsorbing material can adsorb SO2The adsorption activity of the sulfur-containing activated coke powder is gradually reduced, and the deactivated powdered activated coke is sent to a sulfur-containing powdered coke bin to provide raw materials for a powdered activated coke regeneration system, wherein the temperature is about 50-150 ℃. The sulfur-carrying coke breeze discharged from the sulfur-carrying coke breeze bin enters a coke breeze preheating cyclone group, which aims to heat the sulfur-carrying coke breeze to 150-220 ℃ and remove part of water absorbed by the powdery active coke in the absorption process; the carrier gas of the coke breeze preheating cyclone group is clean flue gas, is obtained after desulfurization and dust removal, the temperature is reduced to 100-200 ℃ from 300-350 ℃ after the coke breeze absorbs heat, and the carrier gas and the coke breeze in the coke breeze preheating cyclone group integrally present reverse direct heat exchange, so the coke breeze preheating cyclone group has the advantages of large heat exchange coefficient and small heat exchange area. And the flue gas after heat exchange of the coke breeze preheating cyclone group is discharged to a desulfurizing tower to participate in a desulfurization reaction, and the preheated coke breeze is sent to a fluidized regeneration tower to complete a regeneration reaction.
The powdery active coke fluidization regeneration tower heats the coke breeze after dehydration and preheating treatment of the coke breeze preheating cyclone group to 400-550 ℃ to complete the active coke regeneration reaction, and the reaction mechanism is that C and H stored in a pore structure in the active coke adsorption process2SO4React to generate SO2/CO2/CO/H2O, etc., gas, called stripping gas, in which SO2The concentration of the gas is about 10-30%, and the gas can be used for industrial acid production or reductive gas (H)2/CO/CH4Etc.) and carbon are reduced into elemental sulfur, thereby realizing resource utilization. Through the regeneration reaction of active coke, is treated by H2SO4The occupied active adsorption sites are released again, and the active coke regains adsorption SO2The ability of the cell to perform.
The whole fluidized regeneration tower presents a tower structure, the dewatered coke breeze moves from top to bottom through a blanking pipe in the tower, the heat source for coke breeze regeneration reaction is high-temperature flue gas (600 ℃ -800 ℃), and the high-temperature flue gas passes through a heat exchange pipe bundle arranged in the fluidized regeneration tower from bottom to topUpward flow; the coke breeze and the high-temperature flue gas integrally show reverse heat exchange, and have a large heat exchange coefficient (10-50W/m)2K) And heating the coke breeze to 400-550 ℃, and cooling the high-temperature flue gas to 300-500 ℃.
The temperature of the regenerated gas discharged from the tower is about 200-400 ℃, the waste heat of part of high-temperature flue gas is recovered through a gas-gas heat exchanger, the temperature is raised to 300-500 ℃, one part of the regenerated gas is used as fluidizing gas of the fluidizing regeneration tower and is returned to the bottom of the tower for fluidizing the coke breeze in the tower, so that the good flowing characteristic of the coke breeze in the tower is realized, and the coke breeze is prevented from being accumulated and blocked.
And (3) after part of waste heat of the high-temperature flue gas discharged from the desorption tower is recovered, reducing the temperature to 250-450 ℃, and discharging the high-temperature flue gas to a desulfurization tower to participate in desulfurization reaction.
The temperature of high-temperature coke breeze discharged from a fluidization regeneration tower is about 400-550 ℃, the high-temperature coke breeze passes through a coke breeze cooling cyclone group, the regenerated coke breeze is cooled to 80-120 ℃ and stored in a regenerated coke breeze bin, 50-100 ℃ clean flue gas after a desulfurizing tower participates in direct heat exchange, the temperature is raised to 300-350 ℃ through heat exchange, and the clean flue gas is sent to a coke breeze preheating cyclone group for preheating and dehydrating sulfur-carrying coke breeze. Therefore, the whole system realizes the regeneration of the sulfur-carrying coke breeze and the generation and utilization of the regenerated gas, realizes the reasonable utilization of the waste heat of the regenerated coke breeze, adopts a reverse direct heat exchange mode, improves the heat exchange coefficient and the system economy of the coke breeze, and reduces the volume of a regeneration device.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sulfur-carrying active coke fluidized regeneration tower is characterized in that: the fluidized air distribution device comprises a shell, and a fluidized air distribution device, a heat exchange tube assembly and a discharging tube assembly which are arranged in the shell;
the fluidization air distribution device is at least one in number and is arranged on the cross section of the shell at the set height; each fluidized air distribution device comprises a finned heat exchange tube assembly and a material cone assembly, the finned heat exchange tubes comprise heat exchange tube bodies and heat exchange fins radially arranged on the outer sides of the heat exchange tube bodies, and a plurality of finned heat exchange tubes are tiled and arranged on the cross section of the shell at intervals in a set distance;
the material cone is a bent plate body, the material cone assembly is arranged above the heat exchange tube assembly with the fins, the tip end of the material cone assembly is upward, and two wings of the material cone assembly are matched with the fins of two adjacent heat exchange tubes with the fins to form a fluidized air flow channel;
the heat exchange pipe assembly is arranged above the fluidized air distribution device;
the blanking pipe is vertically arranged on one side of the shell, the upper end of the blanking pipe is positioned above the fluidized air distribution device, and the lower end of the blanking pipe is positioned below the fluidized air distribution device.
2. The sulfur-loaded activated coke fluidized-state regeneration tower according to claim 1, characterized in that: the number of fins on the heat exchange tube with fins is 2-4.
3. The sulfur-loaded activated coke fluidized-state regeneration tower according to claim 1, characterized in that: the heat exchange tube assembly is arranged along the horizontal direction and is respectively connected with the high-temperature flue gas source.
4. The sulfur-loaded activated coke fluidized-state regeneration tower according to claim 1, characterized in that: two adjacent blanking pipes are respectively arranged on two opposite sides of the shell.
5. A sulfur-bearing active coke regeneration system is characterized in that: the system comprises a fluidized state regeneration tower, a first coke breeze preheating cyclone separator component and a second coke breeze preheating cyclone separator component, wherein the first coke breeze preheating cyclone separator component is arranged at the solid inlet end of the fluidized state regeneration tower and is used for being connected with a sulfur-carrying active coke source; and the second coke breeze preheating cyclone separator component is arranged at the solid outlet end of the fluidized state regeneration tower and is used for being connected with the regenerated coke breeze storage bin.
6. The sulfur-loaded activated coke regeneration system of claim 5, wherein: the fluidized-state regeneration tower also comprises a gas-gas heat exchanger, wherein the inlet of one flow path of the gas-gas heat exchanger is connected with the tower top gas outlet of the fluidized-state regeneration tower, and the outlet of the flow path of the gas-gas heat exchanger is connected with the tower bottom fluidization gas inlet of the fluidized-state regeneration tower;
the inlet of the other flow path of the gas-gas heat exchanger is connected with the outlet of the heat exchanger.
7. The sulfur-loaded activated coke regeneration system of claim 5, wherein: the cyclone separators in the first coke breeze preheating cyclone separator component and the second coke breeze preheating cyclone separator component are vertical cyclone separators or horizontal cyclone separators;
further, the first coke breeze preheating cyclone separator component comprises a first cyclone separator, a second cyclone separator and a third cyclone separator, wherein the clean flue gas conveying pipeline is sequentially connected with a second cyclone separator solid outlet, a third cyclone separator material inlet, a third cyclone separator gas phase outlet, a first cyclone separator solid outlet, a second cyclone separator material inlet, a second cyclone separator gas phase outlet, a sulfur-carrying coke breeze bin outlet, a first cyclone separator material inlet and a first cyclone separator gas phase outlet;
and a solid outlet of the third cyclone separator is connected with a material inlet of the fluidization regeneration tower.
8. A method for regenerating sulfur-carrying active coke is characterized by comprising the following steps: the method comprises the following steps:
after being preheated and dehydrated by high-temperature gas, the sulfur-loaded active coke enters a fluidized regeneration tower and falls to the upper part of a fluidized air distribution device through a discharge pipe;
introducing fluidizing air below the fluidized air distribution device to fluidize the sulfur-loaded active coke above the fluidized air distribution device, introducing high-temperature flue gas into the heat exchange pipe, wherein the flowing directions of the flue gas and the active coke are opposite, so that the heat exchange efficiency is improved, and the sulfur-loaded active coke is heated and regenerated;
the regenerated active coke enters the second coke breeze preheating cyclone separator component under the carrying of clean flue gas, the separation is carried out after direct heat exchange, the regenerated and cooled active coke is collected and stored, the heated clean flue gas carries the sulfur-carrying active coke to the first coke breeze preheating cyclone separator component to preheat and remove water from the sulfur-carrying active coke, and the steps are circulated.
9. The method for regenerating sulfur-loaded activated coke according to claim 8, characterized in that: the temperature of the preheated sulfur-carrying active coke is 150-220 ℃;
further, the temperature of the sulfur-loaded active coke after being heated in the fluidized-state regeneration tower is 400-550 ℃;
further, the temperature of the high-temperature flue gas for heating the sulfur-carrying active coke is 600-800 ℃.
10. The method for regenerating sulfur-loaded activated coke according to claim 8, characterized in that: the temperature of the desorption gas flowing out of the top of the fluidization regeneration tower after being heated by the flue gas is 300-500 ℃, and part of the heated desorption gas is used as the fluidization gas to circularly flow back to the fluidization regeneration tower.
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