CN107961770B - Regeneration system and regeneration method of adsorbent in coke oven flue gas purification - Google Patents

Regeneration system and regeneration method of adsorbent in coke oven flue gas purification Download PDF

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CN107961770B
CN107961770B CN201810002070.9A CN201810002070A CN107961770B CN 107961770 B CN107961770 B CN 107961770B CN 201810002070 A CN201810002070 A CN 201810002070A CN 107961770 B CN107961770 B CN 107961770B
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adsorbent
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coke oven
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CN107961770A (en
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朱廷钰
李玉然
张帅
王斌
林玉婷
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Institute of Process Engineering of CAS
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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
    • 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
    • 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
    • B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
    • B01J20/3458—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase
    • 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
    • B01J20/3483—Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • 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
    • B01D2259/40086—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by using a purge gas
    • 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
    • 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
    • B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas

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  • General Chemical & Material Sciences (AREA)
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Abstract

The invention provides a regeneration system and a regeneration method of an adsorbent in coke oven flue gas purification, wherein the system comprises a desorption tower, a screening device, a purification device, an ammonium sulfate treatment section and a coke oven; a discharge port of a regenerated adsorbent of the desorption tower is connected with a screening device, a heating section and a cooling section are arranged in the desorption tower, a heat source inlet of the heating section is connected with a heat source generating device, a heat source outlet of the heating section returns to the heat source generating device, and a cold source inlet of the cooling section is connected with a cold source; the analytic gas outlet of the analytic tower is connected with the ammonium sulfate treatment section and the coke oven. The adsorbent is desorbed in the desorption tower and is blown to form SO2The concentrated gas is desulfurized in a sulfur-ammonia working section, and the residual gas is introduced into a combustion chamber of a coke oven to be used as fuel. And after the analysis, the activated carbon is screened and then participates in the flue gas purification again, and the screened powder slag is used for water treatment and coal blending coking. The invention does not generate three wastes and harmful substances which are difficult to treat, and really realizes clean and high-efficiency coke oven flue gas treatment by matching with the flue gas purification process.

Description

Regeneration system and regeneration method of adsorbent in coke oven flue gas purification
Technical Field
The invention belongs to the technical field of flue gas purification equipment, relates to a regeneration system and a regeneration method of an adsorbent in coke oven flue gas purification, and particularly relates to a regeneration system and a regeneration method of an adsorbent in coke oven flue gas purification, which can simultaneously recover byproducts.
Background
Activated carbon has been used in a variety of applications, such as flue gas purification and water treatment, as a porous material having a large specific surface area, a developed pore structure, and a rich functional group. The flue gas purification technology by the activated carbon method is mature in the steel industry, and can be used for simultaneously removing SO in flue gas2And NOxThe method also has the advantages of no water consumption, no secondary pollution, effective removal of pollutants such as dust, heavy metals (such as mercury) and the like in the flue gas, regeneration and recovery of sulfur resources through the adsorbent and the like, and can be well applied to flue gas purification and treatment in the fields of coal-fired power plants, sintering machines, coke ovens, waste incineration and the like. Compared with other treatment methods such as wettingThe most obvious advantage of the combined process of desulfurization and SCR denitration is that no by-product or three wastes which are difficult to utilize are generated in the process.
Due to the characteristics of low sulfur and high nitrogen of the coke oven flue gas, the flue gas purification process by the activated carbon method can obtain higher denitration rate and can adsorb and remove H in the coke oven flue gas2S, HCN, tar, and volatile organic compounds. The activated carbon needs to be regenerated after being adsorbed and saturated so as to be recycled, the purification cost is reduced, and the components in the desorption gas generated in the regeneration process are complex and mainly N2、SO2、CO、CO2、CH4And volatile organic compounds, etc., and ammonia is generally used for absorbing SO in the ammonia2The preparation of ammonium sulfate, and the coking plant has an ammonium sulfate working section, can be well combined with a regeneration process, and reduces the investment and operation cost.
The invention discloses a flue gas desulfurization and denitration process combining ammonia desulfurization and activated carbon denitration, wherein the ammonia desulfurization is a mature wet desulfurization process in the prior art, the activated carbon denitration is a dry denitration process, and activated carbon is recycled in the process, namely, the activated carbon is adsorbed and saturated and then is desorbed by a regeneration tower, so that the effects of desulfurization, denitration, dust removal, mercury removal and volatile organic compounds are achieved at the same time. The patent does not address how the by-products generated during the process are disposed of.
The invention patent CN 106693603A discloses an active carbon method flue gas purification device and a purification treatment method, the device comprises an active carbon absorption tower and an active carbon analysis tower, the treatment process is divided into two steps of active carbon absorption purification and analysis regeneration, the internal structure of the absorption tower is described in detail, the process flow is described simply, the use, loss, waste and other conditions of materials related to the system are not described, and the recycling of waste residues and waste gases is not discussed.
Therefore, the post-treatment method of the flue gas purification process design system by the activated carbon method is researched, the smooth implementation of the activated carbon regeneration process is ensured, the flue gas purification process by the activated carbon method is further ensured not to generate waste residues and waste gas, the efficient clean utilization is realized, and the method has very important significance.
Disclosure of Invention
The invention provides a regeneration system and a regeneration method of an adsorbent in coke oven flue gas purification, aiming at the problem that the waste gas and waste residues can not be effectively treated in the existing flue gas purification process. The invention develops and designs the flue gas purification process suitable for the coke oven by optimizing the coke oven flue gas purification regeneration process and combining the advantages of the coke oven and the plant resources of the coke plant. The method does not produce any by-product which is difficult to utilize while playing a role of removing the active carbon, and really realizes clean and efficient flue gas purification.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a regeneration system of an adsorbent in coke oven flue gas purification, which comprises a desorption tower, a screening device, a purification device, an ammonium sulfate treatment section and a coke oven;
the desorption tower comprises a heating section positioned at the upper part and a cooling section positioned below the heating section, a heat source inlet of the heating section is connected with a heat source generating device, a heat source outlet of the heating section returns to the heat source generating device, and a cold source inlet of the cooling section is connected with a cold source; the lower part of the desorption tower is provided with a purge gas inlet, the upper part of the desorption tower is provided with a desorption gas outlet, and the desorption gas outlet is connected with the ammonium sulfate treatment section and the coke oven.
When the coke oven flue gas is purified, the used adsorbent such as activated carbon and/or activated coke is saturated, and then the desorption is completed through a regeneration process so as to carry out the recycling. The regeneration process mainly comprises adsorbent regeneration and post-treatment of the desorption gas, the activated carbon is desorbed during high-temperature heating, coke oven gas is combusted through a hot blast stove to supply heat, and SO is contained2The desorption gas is discharged from the desorption tower, is subjected to dust removal and purification, and then is introduced into an ammonium sulfate working section of a coking plant to recover sulfur resources, and the residual CO-containing gas enters a combustion chamber of a coke oven to participate in combustion, so that waste residues and waste gases are generated in the regeneration process.
In the present invention, the desorption tower is an adsorbent regeneration reactor and the desorption tower is a secondary desorption towerThe obtained gas mainly contains N2、SO2And CO, which mainly contains N after the sulfur resource is recycled in the ammonium sulfate working section of the coking plant2And CO, wherein the concentration of the CO can reach about 20 percent, and the CO can be used as fuel to be introduced into a main pipeline of coke oven gas and finally enter a combustion chamber of the coke oven to participate in combustion.
In the invention, the ammonium sulfate treatment section is the existing ammonium sulfate treatment section in a coking plant and is the prior art.
The invention discloses a regeneration system and a regeneration method of an adsorbent in coke oven flue gas purification, and relates to treatment of coke oven gas, nitrogen and coking wastewater in a coking plant, a coke oven and the like. Coke oven gas is used as a heat supply medium of the heat source generating device; nitrogen is used as purge gas of the regeneration tower to obtain concentrated SO2The desorption gas of (3); the undersize activated carbon powder is sent to a sewage treatment working section to be used as a water treatment adsorbent; the decomposed gas can enter an ammonium sulfate recovery working section to recover sulfur resources, and simultaneously enters a coke oven combustion chamber to be used as fuel to recycle combustible components.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
As a preferable technical scheme of the invention, the screening device screens to obtain oversize products and undersize products, the oversize products are regenerated adsorbents and are subjected to adsorption-desorption cyclic utilization, and the undersize products participate in coking wastewater treatment and/or coal blending coking.
Wherein, the undersize can be sent to participate in the coking wastewater treatment process, and after the adsorption capacity is obviously reduced, the undersize is sent to a coal blending workshop to participate in coal blending coking.
Preferably, the undersize comprises a slag with a particle size of > 2mm and a powder with a particle size of < 2mm, wherein the slag can have a particle size of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, etc. and larger particle sizes, but is not limited to the recited values, and other non-recited values in the range of the values are also applicable; the particle size of the powder may be 1.7mm, 1.5mm, 1.3mm, 1mm, 0.7mm, 0.5mm, 0.3mm, etc. and smaller, but is not limited to the recited values, and other values not recited within the range of values are equally applicable. For example, the undersize comprises activated carbon residue with a particle size of > 2mm and activated carbon powder with a particle size of less than 2 mm.
Preferably, the slag with the particle size of more than 2mm is sent to a coking wastewater treatment process to be used as a water treatment adsorbent, and the powder with the particle size of less than 2mm participates in coal blending coking.
Preferably, the screening device is a vibrating screen.
Preferably, a discharge valve is arranged between the discharge port of the regenerated adsorbent and the screening device and is used for controlling the moving speed of the adsorbent in the desorption tower.
As the preferable technical scheme of the invention, the heat source generating device is a hot blast stove which generates flue gas with the temperature of 450-550 ℃ as the heat source of the desorption tower; the temperature of the flue gas may be 450 ℃, 460 ℃, 470 ℃, 480 ℃, 490 ℃, 500 ℃, 510 ℃, 520 ℃, 530 ℃, 540 ℃ or 550 ℃, but is not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
Preferably, a gas conveying device is arranged between the heat source inlet of the heating section and the heat source generating device.
Preferably, the gas conveying device is a circulating fan.
Preferably, the heat supply medium of the hot blast stove is coal gas.
Preferably, the gas is any one of or a combination of at least two of coke oven gas, coke oven/blast furnace mixed gas, blast furnace gas or natural gas, and typical but non-limiting examples of the combination are: the combination of coke oven gas and coke oven/blast furnace mixed gas, the combination of blast furnace gas and natural gas, the combination of coke oven gas, coke oven/blast furnace mixed gas and blast furnace gas, the combination of coke oven/blast furnace mixed gas, blast furnace gas and natural gas, etc. The natural gas can be purchased outside, the coal gas of a common coking plant is sufficient, and the process has small consumption and can meet the requirements.
Preferably, the cold source is air.
Preferably, the cold source is generated by a fan, and the fan is connected with the cold source inlet of the cooling section.
As a preferred embodiment of the present invention, the purge gas inlet is located below the cooling zone in the desorption tower.
Preferably, the purge gas is nitrogen, which may be nitrogen produced from an air separation process in a plant or from a commercially available nitrogen generator. In the invention, the consumption of the nitrogen is relatively small, and a nitrogen making machine can be purchased to be special for the process system.
Preferably, the purge gas inlet is connected to a nitrogen generation device.
Preferably, the stripping gas outlet is located above the heating section in the stripper column.
As a preferable technical scheme of the invention, a purification device is arranged between the desorption gas outlet and the ammonium sulfate treatment section, and the purification device is mainly used for removing dust in the desorption gas.
Preferably, the purification device is a cloth bag dust removal device.
As a preferable technical scheme of the invention, the adsorbent to be regenerated is a desulfurization adsorbent.
Preferably, the desulfurization adsorbent is activated carbon and/or activated coke, preferably activated carbon.
Preferably, the shape of the adsorbent to be regenerated is any one of particles, cylinders, spheres or platelets or a combination of at least two of them, typical but non-limiting examples being: a combination of particles and cylinders, a combination of spheres and platelets, a combination of particles, cylinders and spheres, a combination of particles, cylinders, spheres and platelets, and the like.
Preferably, the adsorbent to be regenerated comes from an adsorbent used in coke-oven plant coke oven flue gas cleaning.
In a second aspect, the invention provides a method for regenerating an adsorbent in coke oven flue gas purification, which comprises the following steps:
(a) heating, resolving and cooling the adsorbent to be regenerated in a resolving tower to obtain a regenerated material;
(b) screening the regenerated material in the step (b) to obtain oversize products and undersize products, wherein the oversize products are regenerated adsorbents and are subjected to adsorption-desorption cyclic utilization, and the undersize products participate in coking wastewater treatment and/or coal blending coking;
(c) and after the analysis is finished, introducing purge gas into the analysis tower for purging to obtain analysis gas, introducing the analysis gas into the ammonium sulfate treatment section for recovering sulfur, and then introducing the analysis gas into a coke oven for burning as fuel.
As a preferred technical scheme of the invention, the adsorbent to be regenerated in the step (a) is a desulfurization adsorbent.
Preferably, the desulfurization adsorbent is activated carbon and/or activated coke, preferably activated carbon.
Preferably, the adsorbent to be regenerated in step (a) is in the shape of any one or a combination of at least two of particles, cylinders, spheres or platelets, typical but non-limiting examples of which are: a combination of particles and cylinders, a combination of spheres and platelets, a combination of particles, cylinders and spheres, a combination of particles, cylinders, spheres and platelets, and the like.
Preferably, the adsorbent to be regenerated in step (a) comes from an adsorbent used in coke oven plant coke oven flue gas cleaning.
Preferably, the temperature for thermal desorption in step (a) is 450 to 550 ℃, for example 450 ℃, 460 ℃, 470 ℃, 480 ℃, 490 ℃, 500 ℃, 510 ℃, 520 ℃, 530 ℃, 540 ℃ or 550 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
As a preferred embodiment of the present invention, the screening in step (b) is performed in a screening device.
Preferably, the undersize in step (b) comprises a residue with a particle size of > 2mm and a powder with a particle size of < 2 mm. The particle size of the powder may be 1.7mm, 1.5mm, 1.3mm, 1mm, 0.7mm, 0.5mm, or 0.3mm, and smaller, but is not limited to the values listed, and other values not listed in the range of the values are also applicable. For example, the undersize comprises activated carbon residue with a particle size of > 2mm and activated carbon powder with a particle size of less than 2 mm.
Preferably, the slag with the particle size of more than 2mm is sent to a coking wastewater treatment process to be used as a water treatment adsorbent, and the powder with the particle size of less than 2mm participates in coal blending coking.
Preferably, the purge gas of step (c) is nitrogen.
Preferably, said gas of step (c) comprises N2、SO2And CO;
preferably, the SO in the analysis gas is controlled in step (c) by controlling the amount of purge gas introduced2The content of (b) is 5% to 20% by volume, for example 5%, 8%, 10%, 12%, 15%, 18% or 20%, but is not limited to the recited values, and other values not recited in the numerical range are also applicable, preferably 10% to 15%.
Preferably, the volume content of CO in the stripping gas after passing through the ammonium sulphate treatment stage to recover sulphur in step (c) is from 10% to 25%, for example 10%, 13%, 15%, 17%, 20%, 23% or 25%, but is not limited to the values recited and other values not recited in this range are equally applicable.
Preferably, in step (c), the desorption gas is purified and then is introduced into an ammonium sulfate treatment section to recover sulfur.
As a preferred technical scheme of the invention, the method comprises the following steps:
(a) heating, resolving and cooling activated carbon and/or activated coke to be regenerated used in coke oven flue gas purification of a coke-oven plant in a resolving tower at 450-550 ℃ to obtain a regenerated material;
(b) screening the regenerated material in the step (b) to obtain oversize products and undersize products, wherein the oversize products are the regenerated adsorbent and are subjected to adsorption-desorption cyclic utilization, the undersize products comprise slag-like products with the granularity larger than 2mm and powder-like products with the granularity smaller than 2mm, the slag-like products with the granularity larger than 2mm are sent to a coking wastewater treatment process to be used as the water treatment adsorbent, and the powder-like products with the granularity smaller than 2mm participate in coal blending coking;
(c) after the analysis is finished, introducing nitrogen into the analysis tower for purging to obtain the analysis gas, and controlling the introduction amount of the purge gas to control SO in the analysis gas2The volume content of the sulfur-containing gas is 5-20 percent, the desorption gas is purified and then is introduced into an ammonium sulfate treatment section to recover sulfur, and then the sulfur enters a coke oven to be used as fuelAnd (4) burning the materials.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a regeneration system and a regeneration method of an adsorbent in coke oven flue gas purification, which mainly aim at the adsorbent used in the coke oven flue gas process of a coke-oven plant, and the adsorbent adsorbs and removes SO in the flue gas2、NOxHeavy metals, dust, H2S and volatile organic compounds and other harmful substances enter the desorption tower for regeneration, no waste is generated in the regeneration process, the by-product adsorbent powder (slag) is applied to sewage purification and coke oven coking, and the desorption gas is fed into the coke oven for combustion after sulfur is recovered;
the regeneration system and the regeneration method solve the problem of recycling of byproducts, and can really realize high-efficiency clean flue gas purification by matching with an activated carbon adsorption purification process.
Drawings
FIG. 1 is a schematic structural diagram of a regeneration system of an adsorbent in coke oven flue gas purification according to the present invention;
FIG. 2 is a schematic structural diagram of a regeneration system of an adsorbent in the purification of coke oven flue gas according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural diagram of a regeneration system of an adsorbent in the purification of coke oven flue gas according to embodiment 2 of the present invention;
the system comprises a desorption tower, a screening device, a heat source generating device, a 4-ammonium sulfate processing section, a coke oven, a 6-fan, a 7-purifying device, an 8-adsorption tower bucket elevator and an adsorbent buffer bin, wherein the desorption tower is 1, the screening device is 2, the heat source generating device is 3, the ammonium sulfate processing section is 5, the coke oven is 6, the fan is 7, the purifying device is 8, and the adsorbent buffer bin.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
The invention provides a regeneration system and a regeneration method of an adsorbent in coke oven flue gas purification, as shown in figure 1, the system comprises a desorption tower 1, a screening device 2, a heat source generating device 3, an ammonium sulfate treatment section 4 and a coke oven 5;
the desorption tower 1 comprises a heating section positioned at the upper part and a cooling section positioned below the heating section, a heat source inlet of the heating section is connected with a heat source generating device 3, a heat source outlet of the heating section returns to the heat source generating device 3, and a cold source inlet of the cooling section is connected with a cold source; the lower part of the desorption tower 1 is provided with a purge gas inlet, the upper part of the desorption tower is provided with a desorption gas outlet, and the desorption gas outlet is connected with the ammonium sulfate treatment section 4 and the coke oven 5.
The method comprises the following steps:
(a) heating, resolving and cooling the adsorbent to be regenerated in a resolving tower 1 to obtain a regenerated material;
(b) screening the regenerated material in the step (b) to obtain oversize products and undersize products, wherein the oversize products are regenerated adsorbents and are subjected to adsorption-desorption cyclic utilization, and the undersize products participate in coking wastewater treatment and/or coal blending coking;
(c) after the analysis is finished, introducing purge gas into the analysis tower 1 for purging to obtain analysis gas, introducing the analysis gas into the ammonium sulfate treatment section 4 for recovering sulfur, and then introducing the analysis gas into the coke oven 5 for combustion as fuel.
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides a regeneration system and a regeneration method of an adsorbent in coke oven flue gas purification, and as shown in fig. 2, the system comprises an analytical tower 1, a screening device 2, a heat source generating device 3, an ammonium sulfate treatment section 4, a coke oven 5 and a fan 6;
the desorption tower 1 comprises a heating section positioned at the upper part and a cooling section positioned below the heating section, a heat source inlet of the heating section is connected with a heat source generating device 3, a circulating fan is arranged between a heat source inlet of the heating section and the heat source generating device 3, a heat source outlet of the heating section returns to the heat source generating device 3, a cold source inlet of the cooling section is connected with a cold source, and the cold source is generated by a fan 6; the lower part of the desorption tower 1 is provided with a purge gas inlet, the upper part of the desorption tower is provided with a desorption gas outlet, and the desorption gas outlet is connected with the ammonium sulfate treatment section 4 and the coke oven 5; the heat supply medium of the hot blast stove is coke oven gas, the adsorbent is granular activated carbon used in the purification of coke oven gas in a coke plant, and the screening device 2 is a vibrating screen.
The processing method of the system comprises the following steps:
(a) granular activated carbon to be regenerated used in the purification of coke oven flue gas from a coke plant is sent into an analytical tower 1 through an adsorption tower bucket elevator 8, and is heated, analyzed and cooled in the analytical tower 1 at 500 ℃ to obtain a regenerated material;
(b) screening the regenerated material in the step (b) in a screening device 2 to obtain oversize materials and undersize materials, wherein the oversize materials are regenerated adsorbents and are sent into an adsorbent buffer bin 9 to be adsorbed and analyzed for cyclic utilization, the undersize materials comprise slag materials with the granularity larger than 2mm and powder materials with the granularity smaller than 2mm, the slag materials with the granularity larger than 2mm are sent into a coking wastewater treatment process to be used as water treatment adsorbents, the slag materials enter a coal blending workshop to participate in coal blending coking when the purification capacity is obviously reduced, the wastewater treatment process can not be consumed and directly go to the coal blending coking, and the powder materials with the granularity smaller than 2mm participate in the coal blending coking;
(c) after the analysis is finished, introducing nitrogen into the analysis tower 1 for purging to obtain the analysis gas, and controlling the introduction amount of the purge gas to control SO in the analysis gas2The volume content of the sulfur is 15 percent, the desorption gas is introduced into the ammonium sulfate treatment section 4 to recover sulfur, the volume content of CO in the gas after sulfur recovery reaches 20 percent, and the gas enters the coke oven 5 to be used as fuel for combustion.
The system and the method do not generate any waste, and solve the problem of recycling of the by-products.
Example 2:
the present embodiment provides a system and a method for regenerating an adsorbent in coke oven flue gas purification, the structure of the system refers to the structure in embodiment 1, and the difference is that, as shown in fig. 3, the system further includes a purification device 7, the purification device 7 is located between a desorption gas outlet and an ammonium sulfate treatment section 4, and the purification device 7 is a cloth bag dust removal device; the heat supply medium of the hot blast stove is coke oven and blast furnace mixed gas.
The regeneration process is referred to the process of example 1, with the only difference that: the adsorbent is cylindrical active coke to be regenerated used in the purification of coke oven flue gas from a coke-oven plant; the resolving temperature in the step (a) is 460 ℃; the slag with the granularity larger than 2mm in the step (b) is sent to a coking wastewater treatment workshop and then is sold to an active carbon recycling manufacturer for recycling or a small-sized furnace for serving as fuel; introducing nitrogen into the desorption tower 1 in the step (c) for purging to obtain the analysis gas, and controlling the introduction amount of the purge gas to control SO in the analysis gas2The volume content of the desorption gas is 10 percent, the desorption gas is subjected to dust removal through a purification device 7, then is introduced into an ammonium sulfate treatment section 4 to recover sulfur, and then enters a coke oven 5 to be used as fuel for combustion.
The system and the method do not generate any waste, and solve the problem of recycling of the by-products.
Example 3:
the present embodiment provides a system and a method for regenerating an adsorbent used in the purification of coke oven flue gas, the system being configured as in embodiment 1, except that the heating medium of the hot blast stove is blast furnace gas.
The regeneration process is referred to the process of example 1, with the only difference that: the adsorbent is spherical activated carbon to be regenerated used in the purification of coke oven flue gas from a coke-oven plant; the resolving temperature in the step (a) is 540 ℃; introducing nitrogen into the desorption tower 1 in the step (c) for purging to obtain the analysis gas, and controlling the introduction amount of the purge gas to control SO in the analysis gas2The volume content of the desorption gas is 20 percent, the desorption gas is subjected to dust removal through a purification device 7, then is introduced into an ammonium sulfate treatment section 4 to recover sulfur, and then enters a coke oven 5 to be used as fuel for combustion.
The system and the method do not generate any waste, and solve the problem of recycling of the by-products.
It can be seen from the above embodiments that the system and the method for regenerating the adsorbent in the purification of the coke oven flue gas fully combine the advantages of the resources in the plant area of the coke oven plant, and recycle the waste generated in the system on the premise of ensuring the effect of removing the flue gas, thereby not generating three wastes, but saving and utilizing the resources, really realizing the purification of the coke oven flue gas with high efficiency and cleanness, and providing a new technical support or an old technical improvement reference for the purification of the coke oven flue gas, and having very important significance.
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (35)

1. A regeneration system of an adsorbent in coke oven flue gas purification is characterized by comprising a desorption tower (1), a screening device (2), a heat source generating device (3), an ammonium sulfate treatment section (4) and a coke oven (5);
the desorption tower (1) comprises a heating section positioned at the upper part and a cooling section positioned below the heating section, a heat source inlet of the heating section is connected with a heat source generating device (3), a heat source outlet of the heating section returns to the heat source generating device (3), and a cold source inlet of the cooling section is connected with a cold source; the lower part of the desorption tower (1) is provided with a purge gas inlet, the upper part of the desorption tower is provided with a desorption gas outlet, and the desorption gas outlet is connected with the ammonium sulfate treatment section (4) and the coke oven (5);
the screening device (2) screens to obtain oversize products and undersize products, the oversize products are regenerated adsorbents and are subjected to adsorption-desorption cyclic utilization, and the undersize products participate in coking wastewater treatment and/or coal blending coking;
the undersize comprises slag with the granularity larger than 2mm and powder with the granularity smaller than 2 mm;
the slag with the granularity of more than 2mm is sent to a coking wastewater treatment process to be used as a water treatment adsorbent, and the powder with the granularity of less than 2mm participates in coal blending coking;
the regeneration system is adopted to carry out desorption regeneration on the adsorbent, and the desorption regeneration process specifically comprises the following steps:
(a) heating, resolving and cooling an adsorbent to be regenerated in a resolving tower (1) to obtain a regenerated material;
(b) screening the regenerated material in the step (b) to obtain oversize products and undersize products, wherein the screening is carried out in a screening device, the oversize products are regenerated adsorbents and are subjected to adsorption-desorption cyclic utilization, the undersize products participate in coking wastewater treatment and/or coal blending coking, the undersize products comprise slag products with the granularity larger than 2mm and powder products with the granularity smaller than 2mm, the slag products with the granularity larger than 2mm are sent to a coking wastewater treatment process to be used as water treatment adsorbents, and the powder products with the granularity smaller than 2mm participate in coal blending coking;
(c) after the analysis is finished, introducing purge gas into the analysis tower (1) for purging to obtain analysis gas, introducing the analysis gas into the ammonium sulfate treatment section (4) for recovering sulfur, and then introducing the analysis gas into a coke oven (5) for combustion as fuel;
said stripping gas of step (c) comprises N2、SO2And CO;
controlling the introduction amount of the purge gas in the step (c) to control SO in the analysis gas2The volume content of (A) is 5-20%;
in the step (c), the volume content of CO in the desorption gas is 10-25% after the desorption gas is introduced into the ammonium sulfate treatment section (4) to recover sulfur.
2. Regeneration system according to claim 1, wherein the screening device (2) is a vibrating screen.
3. Regeneration system according to claim 1, characterised in that a discharge valve is arranged between the regeneration sorbent outlet and the screening device (2).
4. Regeneration system according to claim 1, characterized in that the heat source generating device (3) is a hot blast stove, which generates flue gas with a temperature of 450-550 ℃ as the heat source for the desorption tower (1).
5. Regeneration system according to claim 1, characterized in that a gas conveying device is arranged between the heat source inlet of the heating section and the heat source generating device (3).
6. The regeneration system of claim 5, wherein the gas delivery device is a recycle blower.
7. The regeneration system of claim 4, wherein the heating medium of the hot blast stove is coal gas.
8. The regeneration system of claim 7, wherein the gas is any one of or a combination of at least two of coke oven gas, coke oven and blast furnace mixed gas, blast furnace gas, or natural gas.
9. The regeneration system of claim 1, wherein the cold source is air.
10. Regeneration system according to claim 1, characterised in that the cold source is generated by a fan (6), which fan (6) is connected to the cold source inlet of the cooling section.
11. Regeneration system according to claim 1, wherein the purge gas inlet is located below the cooling section in the stripper column (1).
12. The regeneration system of claim 11, wherein the purge gas is nitrogen.
13. The regeneration system of claim 11, wherein the purge gas inlet is connected to a nitrogen generation device.
14. Regeneration system according to claim 1, wherein the stripping gas outlet is located above the heating section in the stripper column (1).
15. Regeneration system according to claim 14, characterized in that a purification device (7) is arranged between the outlet of the stripping gas and the ammonium sulphate treatment stage (4).
16. Regeneration system according to claim 15, characterized in that said purification device (7) is a bag house.
17. The regeneration system of claim 1, wherein the adsorbent to be regenerated is a desulfurization adsorbent.
18. The regeneration system of claim 17, wherein the desulfurization sorbent is activated carbon and/or activated coke.
19. The regeneration system of claim 18, wherein the desulfurization sorbent is activated carbon.
20. The regeneration system of claim 17, wherein the shape of the adsorbent to be regenerated is any one or a combination of at least two of particles, cylinders, spheres, or platelets.
21. The regeneration system of claim 17, wherein the sorbent to be regenerated is from a sorbent used in coke plant coke oven flue gas cleaning.
22. The regeneration method of the adsorbent in the coke oven flue gas purification is characterized by comprising the following steps:
(a) heating, resolving and cooling an adsorbent to be regenerated in a resolving tower (1) to obtain a regenerated material;
(b) screening the regenerated material in the step (b) to obtain oversize products and undersize products, wherein the screening is carried out in a screening device, the oversize products are regenerated adsorbents and are subjected to adsorption-desorption cyclic utilization, the undersize products participate in coking wastewater treatment and/or coal blending coking, the undersize products comprise slag products with the granularity larger than 2mm and powder products with the granularity smaller than 2mm, the slag products with the granularity larger than 2mm are sent to a coking wastewater treatment process to be used as water treatment adsorbents, and the powder products with the granularity smaller than 2mm participate in coal blending coking;
(c) after the analysis is finished, introducing purge gas into the analysis tower (1) for purging to obtain analysis gas, introducing the analysis gas into the ammonium sulfate treatment section (4) for recovering sulfur, and then introducing the analysis gas into a coke oven (5) for burning as fuel.
23. The regeneration process of claim 22, wherein the adsorbent to be regenerated of step (a) is a desulfurization adsorbent.
24. The regeneration process of claim 23, wherein the desulfurization sorbent is activated carbon and/or activated coke.
25. The regeneration process of claim 24, wherein said desulfurization sorbent is activated carbon.
26. The regeneration method according to claim 22, wherein the adsorbent to be regenerated in step (a) is in the shape of any one or a combination of at least two of particles, cylinders, spheres or platelets.
27. The regeneration process of claim 22, wherein the adsorbent to be regenerated in step (a) is derived from an adsorbent used in coke plant coke oven flue gas cleaning.
28. The regeneration method according to claim 22, wherein the temperature for heat desorption in step (a) is 450 to 550 ℃.
29. The regeneration process of claim 22, wherein the purge gas of step (c) is nitrogen.
30. The regeneration method of claim 22, wherein the stripping gas of step (c) comprises N2、SO2And CO.
31. The regeneration process of claim 22, wherein SO in the process gas is controlled in step (c) by controlling the amount of purge gas introduced2The volume content of (A) is 5-20%.
32. Regeneration process according to claim 31, characterised in that the SO in the analysis gas is controlled in step (c) by controlling the amount of purge gas fed2The volume content of (A) is 10-15%.
33. The regeneration process according to claim 22, wherein the volume content of CO in the desorption gas in step (c) after passing through the ammonium sulfate treatment section (4) for sulfur recovery is 10-25%.
34. The regeneration process according to claim 22, wherein the stripping gas in step (c) is purified and then passed to an ammonium sulfate treatment section (4) for sulfur recovery.
35. Regeneration method according to any one of claims 22 to 34, characterized in that it comprises the following steps:
(a) heating, resolving and cooling activated carbon and/or activated coke to be regenerated used in coke oven flue gas purification of a coke-oven plant in a resolving tower (1) at 450-550 ℃ to obtain a regenerated material;
(b) screening the regenerated material in the step (b) to obtain oversize products and undersize products, wherein the oversize products are the regenerated adsorbent and are subjected to adsorption-desorption cyclic utilization, the undersize products comprise slag-like products with the granularity larger than 2mm and powder-like products with the granularity smaller than 2mm, the slag-like products with the granularity larger than 2mm are sent to a coking wastewater treatment process to be used as the water treatment adsorbent, and the powder-like products with the granularity smaller than 2mm participate in coal blending coking;
(c) after the analysis is finished, introducing nitrogen into the analysis tower (1) for purging to obtain the analysis gas, and controlling the introduction amount of the purge gas to control SO in the analysis gas2The volume content of the desorption gas is 5-20 percent, the desorption gas is purified and then is introduced into an ammonium sulfate treatment section (4) to recover sulfur, and then enters a coke oven (5) to be used as fuel for combustion.
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