CN106955595B - Regeneration method of desulfurizer elemental sulfur in desulfurizing tower - Google Patents

Regeneration method of desulfurizer elemental sulfur in desulfurizing tower Download PDF

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CN106955595B
CN106955595B CN201710256588.0A CN201710256588A CN106955595B CN 106955595 B CN106955595 B CN 106955595B CN 201710256588 A CN201710256588 A CN 201710256588A CN 106955595 B CN106955595 B CN 106955595B
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circulating gas
desulfurizing
temperature
desulfurizer
sulfur
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CN106955595A (en
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宋宇文
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Chengdu Tianli Chemical Engineering Technology Co Ltd
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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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/02—Preparation of sulfur; Purification
    • 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
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
    • 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
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals

Abstract

The invention relates to a method for regenerating elemental sulfur of a desulfurizing agent in a desulfurizing tower, wherein after the desulfurizing agent is desulfurized and saturated, the elemental sulfur is subjected to the following regeneration steps: high-temperature circulating gas enters a desulfurizer to be heated to be above the melting point of the elemental sulfur; heating the desulfurizer by the high-temperature circulating gas, then cooling the heated desulfurizer in a sulfur recovery cooler to a temperature above the melting point of the elemental sulfur to obtain liquid sulfur; the circulating gas from the sulfur recovery cooler exchanges heat with circulating water and is cooled to normal temperature; after the normal temperature circulating gas is pressurized, the circulating gas enters a desulfurizing agent which completes regeneration, and the circulating gas is cooled to the desulfurizing temperature; the circulating gas after cooling the desulfurizer is heated and then enters another desulfurizing tower to be heated and regenerated; and stopping heating the desulfurizer in the desulfurizing tower after the elemental sulfur of the desulfurizer in the desulfurizing tower is analyzed. And cooling the desulfurizer in the desulfurizing tower to the desulfurizing temperature by using normal-temperature circulating gas from the water cooler, and completing the regeneration of the desulfurizer in the desulfurizing tower.

Description

Regeneration method of desulfurizer elemental sulfur in desulfurizing tower
Technical Field
The invention relates to a method for regenerating single sulfur in a desulfurizing agent, which adopts high-temperature regeneration and belongs to the technical field of desulfurization.
Background
At present, the removal of sulfide in mixed gas mainly comprises wet desulfurization and dry desulfurization, the wet desulfurization also comprises physical desulfurization and chemical desulfurization, the physical desulfurization comprises methods such as low-temperature methanol washing, carbon-propane and NHD, the chemical desulfurization comprises ammonia water method, ammonia water liquid phase catalysis method, calibration method, PDS method, modified ADA method and the like, the physical desulfurization adopts absorption and analysis method, the form and property of sulfide are not changed, and the sulfide is only concentrated. The chemical desulfurization changes the form of sulfide and directly obtains elemental sulfur. Chemical desulfurization can only remove inorganic sulfur, hydrogen sulfide, and organic sulfur, which must be removed by a dry process. The physical method can remove both inorganic sulfur and organic sulfur, but the physical method cannot directly obtain elemental sulfur, and the elemental sulfur also needs to be obtained through a Claus sulfur recovery process. In the chemical method and the dry method for removing organic sulfur and inorganic sulfur, the sulfur capacity of the dry method desulfurizer is low, the cost for regenerating elemental sulfur in the dry method desulfurizer is high, and the environment is polluted after the exhaust of the regenerated gas, so that the sulfur capacity of the general desulfurizer is saturated and then directly buried or combusted without regeneration; in the physical method and Claus sulfur recovery process for removing organic sulfur and inorganic sulfur, although the cost is relatively low, the investment is high, the sulfur content in the discharged waste gas cannot reach the national environmental protection discharge regulation, and the cost for treating the waste gas is high. In the process of removing sulfur dioxide from flue gas, sulfur dioxide can be converted into elemental sulfur in a desulfurizing agent, and then the sulfur is obtained by the regeneration method.
Disclosure of Invention
The invention aims to provide a method for removing organic sulfur and inorganic sulfur by a dry method (namely a desulfurizer) to form elemental sulfur and regenerating high-temperature circulating gas to obtain the elemental sulfur, which has the advantages of greatly saving operation cost and investment compared with the prior art, does not discharge regenerated waste gas and reduces environmental pollution.
The technical solution of the invention is as follows:
the method comprises the following steps that (1) a sulfur-containing raw material gas firstly enters a desulfurizing tower filled with a desulfurizing agent, desulfurized purified gas enters the next process, the desulfurizing agent in the desulfurizing tower converts sulfide into elemental sulfur, and the elemental sulfur in the desulfurizing agent undergoes the following regeneration steps after the desulfurizing agent is desulfurized and saturated:
the method comprises the following steps that (1) a sulfur-containing raw material gas firstly enters a desulfurizing tower filled with a desulfurizing agent, desulfurized purified gas enters the next process, the desulfurizing agent in the desulfurizing tower converts sulfide into elemental sulfur, and the elemental sulfur in the desulfurizing agent undergoes the following regeneration steps after the desulfurizing agent is desulfurized and saturated:
the first step is as follows: high-temperature circulating gas from a circulating gas heater enters a desulfurizer to be heated, and the temperature of the desulfurizer is heated to be higher than the melting point of elemental sulfur;
the second step is that: heating the desulfurizer by high-temperature circulating gas, then cooling the high-temperature circulating gas by using external cooling gas in a sulfur recovery cooler, cooling the circulating gas to a temperature above the melting point of elemental sulfur, and simultaneously obtaining liquid sulfur;
the third step: circulating gas from the sulfur recovery cooler enters a water cooler to exchange heat with circulating water, and the circulating gas is cooled to normal temperature;
the fourth step: after the normal-temperature circulating gas from the water cooler is boosted by power equipment, the normal-temperature circulating gas enters a desulfurizing agent which is regenerated, and the desulfurizing agent is cooled to the desulfurization temperature;
the fifth step: the circulating gas after cooling the desulfurizer enters a circulating gas heater to be heated, and then enters another desulfurizing tower for completing desulfurization to be heated and regenerated;
and a sixth step: and stopping heating the desulfurizer in the desulfurizing tower by using high-temperature circulating gas after the elemental sulfur of the desulfurizer in the desulfurizing tower is analyzed. Then, cooling the desulfurizer in the desulfurizing tower to the desulfurizing temperature by using normal-temperature circulating gas from the water cooler,
thus, the desulfurizer in the desulfurizing tower is regenerated, and enters the sulfur-containing feed gas again for desulfurization, and enters the next cycle.
Furthermore, after the desulfurizer in the 'first step' desulfurizing tower is saturated, the circulating gas from the sulfur recovery cooler is firstly used for heating, and then the high-temperature circulating gas from the circulating gas heater is used for heating the desulfurizer, so that the temperature of the desulfurizer is heated to be higher than the melting point of the elemental sulfur. Meanwhile, in the third step, the circulating gas from the sulfur recovery cooler enters the desulfurizing agent which is just desulfurized to be heated, and then enters the water cooler to exchange heat with the circulating water, so that the circulating gas is cooled to the normal temperature.
Furthermore, after the desulfurizer in the 'first-step' desulfurizing tower is saturated, the circulating gas after heating the desulfurizer in other desulfurizing towers is firstly used for heating, then the circulating gas from the sulfur recovery cooler is used for heating, and finally the high-temperature circulating gas from the circulating gas heater is used for heating the desulfurizer to heat the desulfurizer to the temperature of the desulfurizer to be higher than the melting point of the elemental sulfur. Meanwhile, in the third step, the circulating gas from the sulfur recovery cooler enters the desulfurizing tower which is heated for the first time, then enters the desulfurizing agent which is just desulfurized for heating, and finally enters the water cooler for exchanging heat with the circulating water, so that the circulating gas is cooled to the normal temperature.
Further, after the desulfurizer in the 'first step' desulfurizing tower is saturated, circulating gas with different temperatures after heating the desulfurizer in other desulfurizing towers is used for heating in series for 2 times or more than 2 times, then the circulating gas from the sulfur recovery cooler is used for heating, and finally the high-temperature circulating gas from the circulating gas heater is used for heating the desulfurizer to heat the temperature of the desulfurizer to be more than the melting point of elemental sulfur. Meanwhile, in the third step, the circulating gas from the sulfur recovery cooler is firstly heated in a desulfurizing tower which is heated for 2 times or more than 2 times, then is heated in 2 or more than 2 desulfurizing agents which are used for completing desulfurization in series, and finally enters a water cooler to exchange heat with the circulating water, so that the circulating gas is cooled to the normal temperature.
Furthermore, after the normal-temperature circulating gas coming out of the water cooler in the 'fourth step' is boosted by power equipment, the normal-temperature circulating gas enters 2 or more than 2 desulfurizing agents which are subjected to regeneration and have different temperatures in series, and the desulfurizing agent in the first entering desulfurizing tower is cooled to the desulfurizing temperature.
Further, the high-temperature circulating gas in the 'second step' heats the desulfurizer, then enters a sulfur recovery cooler and is cooled by the circulating gas after the desulfurizer is cooled in the 'fifth step', the temperature of the high-temperature circulating gas after the desulfurizer is heated is cooled to be above the melting point of the simple substance sulfur, and meanwhile, liquid sulfur is obtained; meanwhile, the circulating gas after cooling the desulfurizer in the fifth step firstly enters a sulfur recovery cooler to cool the circulating gas after the high-temperature circulating gas heats the desulfurizer, and then enters a circulating gas heater to be heated and then enters another desulfurizing tower to finish desulfurizing, wherein the desulfurizing agent is heated and regenerated.
Further, when the temperature of the high-temperature circulating gas after heating the desulfurizer in the 'second step' is lower than the temperature of the circulating gas after cooling the desulfurizer in the 'fifth step', the circulating gas after cooling the desulfurizer in the 'fifth step' does not enter the sulfur recovery cooler, but directly enters the circulating gas heater through a bypass to be heated, and then enters another desulfurizing tower for completing desulfurization to be heated and regenerated.
Further, the first step: high-temperature circulating gas from a circulating gas heater enters the desulfurizer to be heated, and the temperature of the desulfurizer is heated to 260-450 ℃.
Further, a second step: and the circulating gas after heating the desulfurizer enters a sulfur recovery cooler to exchange heat with low-temperature gas, the temperature of the circulating gas is cooled to be over 130 ℃, and liquid sulfur is obtained at the same time.
Further, the pressure of the sulfur-containing raw material gas is 0 to 10.0MPa (gauge pressure).
Further, the circulating gas pressure in the heating and cooling desulfurizing agent is 0.001 to 0.2MPa (gauge pressure).
Further, all the pipes are insulated and heat-traced.
Further, when the pressure of the sulfur-containing raw material is higher than the normal pressure, the pressure of the desulfurizing tower is reduced to the normal pressure first and then heating regeneration is carried out after the desulfurizing agent in the desulfurizing tower is saturated.
Furthermore, the desulfurizer is various active carbon, various molecular sieves, silica gel, alumina and various special desulfurizers.
Further, the oxygen content of the circulating gas in the heating and cooling desulfurizing agent is less than 0.1% (V).
Compared with the prior art, the method for regenerating the desulfurizer elemental sulfur in the desulfurizing tower has the advantages of greatly saving the operation cost and investment, and reducing the environmental pollution because no regenerated waste gas is discharged.
Drawings
FIG. 1 is a flow chart of temperature swing desulfurization regeneration (atmospheric adsorption) for recovering sulfur by single-tower desulfurization, single-tower heating, single-tower cooling and external gas cooling in example 1 of the present invention.
FIG. 2 is a timing diagram of temperature swing desulfurization regeneration (atmospheric adsorption) for recovering sulfur by single-tower desulfurization, single-tower heating, single-tower cooling and external gas cooling in example 1 of the present invention.
FIG. 3 is a flow chart of the temperature swing desulfurization regeneration (atmospheric adsorption) of cooling and reversion of the circulating gas after single-tower desulfurization, single-tower heating, single-tower cooling and cooling tower in the example 2 of the present invention.
FIG. 4 is a timing diagram of the cooling-back sulfur temperature swing desulfurization regeneration (atmospheric adsorption) of the recycle gas after single-tower desulfurization, single-tower heating, single-tower cooling, and cooling tower in example 2 of the present invention.
FIG. 5 is a flow chart of the temperature swing desulfurization regeneration (atmospheric adsorption) of cooling and reversion of the circulating gas after single-tower desulfurization, two-tower heating, single-tower cooling and cooling tower in the example 3 of the present invention.
FIG. 6 is a timing chart of the cooling-desulfurizing-by-sulfur-changing regeneration (atmospheric adsorption) of the circulating gas after single-tower desulfurization, two-tower heating, single-tower cooling and cooling tower in example 3 of the present invention.
FIG. 7 is a flow chart of the temperature swing desulfurization regeneration (atmospheric adsorption) of cooling and reversion of the circulating gas after single-tower desulfurization, two-tower heating, two-tower cooling and cooling tower in example 4 of the present invention.
FIG. 8 is a timing chart of cooling-desulfurizing-by-sulfur-changing regeneration (atmospheric adsorption) of the circulating gas after single-tower desulfurization, two-tower heating, two-tower cooling and cooling tower in example 4 of the present invention.
FIG. 9 is a flow chart of the temperature swing desulfurization regeneration (atmospheric adsorption) of cooling and reversion of the circulating gas after single-tower desulfurization, three-tower heating, two-tower cooling and cooling tower in the example 5 of the present invention.
FIG. 10 is a timing chart of cooling-desulfurizing-by-sulfur-changing regeneration (atmospheric adsorption) of the circulating gas after single-tower desulfurization, three-tower heating, two-tower cooling and cooling tower in example 5 of the present invention.
Detailed Description
The sulfur-containing raw material gas can be synthetic ammonia conversion gas, water gas, natural gas, semi-water gas, blast furnace gas, cracking dry gas, oilfield associated gas, oil-gas making, power plant flue gas, various sulfur-containing tail gases, waste gases and the like, and can also be any other sulfur-containing mixed gas.
The sulfur-containing raw material gas firstly enters a desulfurizing tower filled with a desulfurizing agent, the desulfurized purified gas enters the next process, the desulfurizing agent in the desulfurizing tower converts sulfide into elemental sulfur, and the elemental sulfur in the desulfurizing agent undergoes the following regeneration steps after the desulfurizing agent is desulfurized and saturated:
the first step is as follows: high-temperature circulating gas from a circulating gas heater enters a desulfurizer to be heated, and the temperature of the desulfurizer is heated to be higher than the melting point of elemental sulfur;
the second step is that: heating the desulfurizer by high-temperature circulating gas, then cooling the high-temperature circulating gas by using external cooling gas in a sulfur recovery cooler, cooling the circulating gas to a temperature above the melting point of elemental sulfur, and simultaneously obtaining liquid sulfur;
the third step: circulating gas from the sulfur recovery cooler enters a water cooler to exchange heat with circulating water, and the circulating gas is cooled to normal temperature;
the fourth step: after the normal-temperature circulating gas from the water cooler is boosted by power equipment, the normal-temperature circulating gas enters a desulfurizing agent which is regenerated, and the desulfurizing agent is cooled to the desulfurization temperature;
the fifth step: the circulating gas after cooling the desulfurizer enters a circulating gas heater to be heated, and then enters another desulfurizing tower for completing desulfurization to be heated and regenerated;
and a sixth step: and stopping heating the desulfurizer in the desulfurizing tower by using high-temperature circulating gas after the elemental sulfur of the desulfurizer in the desulfurizing tower is analyzed. Then, cooling the desulfurizer in the desulfurizing tower to the desulfurizing temperature by using normal-temperature circulating gas from the water cooler,
thus, the desulfurizer in the desulfurizing tower is regenerated, and enters the sulfur-containing feed gas again for desulfurization, and enters the next cycle.
After the desulfurizer in the desulfurizing tower is saturated in the first step, the circulating gas from the sulfur recovery cooler is firstly used for heating, and then the high-temperature circulating gas from the circulating gas heater is used for heating the desulfurizer, so that the temperature of the desulfurizer is heated to be higher than the melting point of the elemental sulfur. Meanwhile, in the third step, the circulating gas from the sulfur recovery cooler enters the desulfurizing agent which is just desulfurized to be heated, and then enters the water cooler to exchange heat with the circulating water, so that the circulating gas is cooled to the normal temperature.
After the desulfurizer in the desulfurizing tower is saturated in the first step, the circulating gas after heating the desulfurizer in other desulfurizing towers is firstly used for heating, then the circulating gas from the sulfur recovery cooler is used for heating, and finally the high-temperature circulating gas from the circulating gas heater is used for heating the desulfurizer to heat the desulfurizer to the temperature higher than the melting point of elemental sulfur. Meanwhile, in the third step, the circulating gas from the sulfur recovery cooler enters the desulfurizing tower which is heated for the first time, then enters the desulfurizing agent which is just desulfurized for heating, and finally enters the water cooler for exchanging heat with the circulating water, so that the circulating gas is cooled to the normal temperature.
After the desulfurizer in the desulfurizing tower is saturated in the first step, circulating gas with different temperatures after heating the desulfurizer in other desulfurizing towers is used for heating in series for 2 times or more than 2 times, then the circulating gas from the sulfur recovery cooler is used for heating, and finally the high-temperature circulating gas from the circulating gas heater is used for heating the desulfurizer to heat the desulfurizer to the temperature of the desulfurizer to be more than the melting point of the elemental sulfur. Meanwhile, in the third step, the circulating gas from the sulfur recovery cooler is firstly heated in a desulfurizing tower which is heated for 2 times or more than 2 times, then is heated in 2 or more than 2 desulfurizing agents which are used for completing desulfurization in series, and finally enters a water cooler to exchange heat with the circulating water, so that the circulating gas is cooled to the normal temperature.
And in the fourth step, normal-temperature circulating gas from the water cooler is subjected to pressure rise through power equipment, then is serially connected into 2 or more than 2 desulfurizing agents in the desulfurizing towers with different temperatures and regeneration is completed, and the desulfurizing agent in the first desulfurizing tower is cooled to the desulfurizing temperature.
The high-temperature circulating gas in the second step heats the desulfurizer, then enters a sulfur recovery cooler, and is cooled by the circulating gas after the desulfurizer is cooled in the fifth step, the temperature of the high-temperature circulating gas after the desulfurizer is heated is cooled to be higher than the melting point of the elemental sulfur, and meanwhile, liquid sulfur is obtained; meanwhile, the circulating gas after cooling the desulfurizer in the fifth step firstly enters a sulfur recovery cooler to cool the circulating gas after the high-temperature circulating gas heats the desulfurizer, and then enters a circulating gas heater to be heated and then enters another desulfurizing tower to finish desulfurizing, wherein the desulfurizing agent is heated and regenerated.
When the temperature of the high-temperature circulating gas after heating the desulfurizer in the 'second step' is lower than the temperature of the circulating gas after cooling the desulfurizer in the 'fifth step', the circulating gas after cooling the desulfurizer in the 'fifth step' does not enter the sulfur recovery cooler, but directly enters the circulating gas heater through a bypass to be heated, and then enters another desulfurizing tower for completing desulfurization to heat and regenerate the desulfurizer.
The first step is as follows: high-temperature circulating gas from a circulating gas heater enters the desulfurizer to be heated, and the temperature of the desulfurizer is heated to 260-450 ℃.
The second step is that: and the circulating gas after heating the desulfurizer enters a sulfur recovery cooler to exchange heat with low-temperature gas, the temperature of the circulating gas is cooled to be over 130 ℃, and liquid sulfur is obtained at the same time.
The pressure of the sulfur-containing raw material gas is 0 to 10.0MPa (gauge pressure).
The pressure of the circulating gas in the heating and cooling desulfurizer is 0.001-0.2 MPa (gauge pressure).
All the pipelines are insulated and heat-traced.
When the pressure of the sulfur-containing raw material is higher than the normal pressure, the pressure of the desulfurizing tower is reduced to the normal pressure first and then heating regeneration is carried out after the desulfurizing agent in the desulfurizing tower is saturated.
The desulfurizer is various active carbon, various molecular sieves, silica gel, alumina and various special desulfurizers.
The oxygen content of the circulating gas in the heating and cooling desulfurizer is lower than 0.1 percent (V).
Example 1 of the present invention
The sulfur-containing raw material gas is synthetic ammonia semi-water gas, including synthetic ammonia semi-water gas using coal, natural gas, oil and others as raw materials.
The composition of the synthetic ammonia semi-water gas of the embodiment is as follows:
Figure BDA0001273541890000071
temperature: not more than 40 DEG C
Pressure: 0.01MPa (G)
As shown in fig. 1, 3 desulfurization towers a-C constitute a variable temperature desulfurization regeneration device, wherein the desulfurization towers are filled with fillers and a desulfurizing agent from bottom to top in sequence, and a single-tower desulfurization, single-tower heating, single-tower cooling and external gas cooling recovery sulfur variable temperature desulfurization regeneration procedure is performed; and fig. 2 shows a timing chart (normal pressure adsorption) of single-tower desulfurization, single-tower heating, single-tower cooling and external gas cooling sulfur temperature-changing desulfurization regeneration, wherein TL in fig. 2 represents desulfurization, TR represents warming regeneration, and LQ represents cooling.
Referring to fig. 1 and 2, the process of the desulfurization tower of the temperature-variable desulfurization regeneration device in one cycle process will be described by taking tower a as an example. And opening the valves 1A and 2A simultaneously, allowing the semi-water gas to enter a desulfurizing tower A, selectively converting organic sulfur and inorganic sulfur in the semi-water gas into elemental sulfur by using a desulfurizing agent in the desulfurizing tower A, and allowing the desulfurized purified gas to enter the next section. After the desulfurizing agent in the desulfurizing tower A is subjected to desulfurization saturation, the following regeneration steps are carried out on the monomer sulfur in the desulfurizing agent:
the first step is as follows: simultaneously opening valves 4A and 5A, and heating the desulfurizer entering the desulfurizing tower A by using high-temperature circulating gas with the temperature of 350 ℃ from a circulating gas heater;
the second step is that: the circulating gas after heating the desulfurizer in the desulfurizing tower A enters a sulfur recovery cooler through a valve 5A and is cooled by external normal temperature air, the temperature of the circulating gas is cooled to be below 150 ℃, and meanwhile, liquid sulfur is obtained. When the temperature of the circulating air after heating the desulfurizer is lower than 150 ℃, stopping cooling by using external normal-temperature air;
the third step: circulating gas from the sulfur recovery cooler enters a water cooler to be cooled by circulating water, and the circulating gas is cooled to normal temperature;
the fourth step: after the normal-temperature circulating gas from the water cooler is pressurized to 20KPa through a blower, the normal-temperature circulating gas enters a desulfurizing tower C which finishes sulfur analysis by opening valves 3C and 6C, and a desulfurizing agent in the desulfurizing tower C is cooled to the desulfurizing temperature of 40-50 ℃;
the fifth step: cooling the circulating gas after the desulfurizer in the desulfurizing tower C, feeding the circulating gas into a circulating gas heater to heat the circulating gas to 350 ℃, and then feeding the circulating gas into the desulfurizer in the desulfurizing tower A to heat and regenerate;
and a sixth step: and after the elemental sulfur of the desulfurizer in the desulfurizing tower A is analyzed, closing the valves 4A and 5A, and stopping heating the desulfurizer in the desulfurizing tower A by using high-temperature circulating gas at the temperature of 350 ℃. Then, the valves 3A and 6A are opened, the desulfurizer in the desulfurizing tower A is cooled to the desulfurizing temperature of 40-50 ℃ by normal-temperature circulating gas from the water cooler,
thus, the desulfurizer in the desulfurizing tower A is regenerated, enters the semi-water gas again for desulfurization, and enters the next cycle.
Thus, the desulfurizing tower A completes one cycle and can enter the next cycle. The desulfurization towers B to C are identical to the circulation steps of the desulfurization tower A, but are staggered in time from each other, as shown in FIGS. 1 and 2.
The number of the desulfurizing towers in a desulfurizing state can be 1 or more than 1, the specific number is determined according to the empty tower speed, the operating pressure and the treatment gas amount, and the device can preserve heat and accompany heat of pipelines at the temperature higher than the normal temperature.
The result of the embodiment is to obtain high-purity elemental sulfur, save a large amount of desulfurizer, have no waste gas emission, and produce waste residue without pollutants, thereby not only obtaining good economic benefit, but also reducing environmental pollution.
Compared with the prior art, the method saves the operation cost by about 50 percent.
Example 2 of the invention
The composition, pressure and temperature of the sulfur-containing feed gas in this example were exactly the same as in example 1.
As shown in fig. 3, 3 desulfurization towers a-C constitute a temperature-varying desulfurization regeneration device, the desulfurization tower is filled with a filler and a desulfurizing agent from bottom to top, and the temperature-varying desulfurization regeneration procedure of cooling the circulating gas after single-tower desulfurization, single-tower heating, single-tower cooling and cooling tower is operated; and FIG. 4 shows a timing chart (atmospheric adsorption) of cooling regeneration of sulfur temperature swing desulfurization by circulating gas after single-tower desulfurization, single-tower heating, single-tower cooling and cooling tower, wherein TL in FIG. 4 represents desulfurization, TR represents heating regeneration, and LQ represents cooling.
Now, the process of the desulfurization tower of the temperature-variable desulfurization regeneration device of the present embodiment in a single cycle process will be described with reference to fig. 3 and 4 by taking tower a as an example. And opening the valves 1A and 2A simultaneously, allowing the semi-water gas to enter a desulfurizing tower A, selectively converting organic sulfur and inorganic sulfur in the semi-water gas into elemental sulfur by using a desulfurizing agent in the desulfurizing tower A, and allowing the desulfurized purified gas to enter the next section. After the desulfurizing agent in the desulfurizing tower A is subjected to desulfurization saturation, the following regeneration steps are carried out on the monomer sulfur in the desulfurizing agent:
the first step is as follows: simultaneously opening valves 4A and 5A, and heating the desulfurizer entering the desulfurizing tower A by using high-temperature circulating gas with the temperature of 350 ℃ from a circulating gas heater;
the second step is that: and (3) cooling the circulating gas after heating the desulfurizer in the desulfurizing tower A by cooling the desulfurizer in the desulfurizing tower C in a fifth step after entering a sulfur recovery cooler through a valve 5A, cooling the circulating gas to below 150 ℃, and simultaneously obtaining liquid sulfur. When the temperature of the high-temperature circulating gas after heating the desulfurizer in the desulfurizing tower A is lower than or equal to the temperature of the circulating gas after cooling the desulfurizer in the desulfurizing tower C in the 'fifth step', the circulating gas after cooling the desulfurizer in the desulfurizing tower C in the 'fifth step' does not enter a sulfur recovery cooler, and enters the circulating gas heating gas from a bypass valve to be heated;
the third step: circulating gas from the sulfur recovery cooler enters a water cooler to be cooled by circulating water, and the circulating gas is cooled to normal temperature;
the fourth step: after the normal-temperature circulating gas from the water cooler is pressurized to 20KPa through a blower, the normal-temperature circulating gas enters a desulfurizing tower C which finishes sulfur analysis by opening valves 3C and 6C, and a desulfurizing agent in the desulfurizing tower C is cooled to the desulfurizing temperature of 40-50 ℃;
the fifth step: cooling the circulating gas after the desulfurizer in the desulfurizing tower C, feeding the circulating gas into a sulfur recovery cooler through a valve 6C to cool and heat the desulfurizer in the desulfurizing tower A, feeding the circulating gas into a circulating gas heater to heat the circulating gas to 350 ℃, and then feeding the circulating gas into the desulfurizer in the desulfurizing tower A to heat and regenerate;
and a sixth step: and after the elemental sulfur of the desulfurizer in the desulfurizing tower A is analyzed, closing the valves 4A and 5A, and stopping heating the desulfurizer in the desulfurizing tower A by using high-temperature circulating gas at the temperature of 350 ℃. Then, the valves 3A and 6A are opened, the desulfurizer in the desulfurizing tower A is cooled to the desulfurizing temperature of 40-50 ℃ by normal-temperature circulating gas from the water cooler,
thus, the desulfurizer in the desulfurizing tower A is regenerated, enters the semi-water gas again for desulfurization, and enters the next cycle.
Thus, the desulfurizing tower A completes one cycle and can enter the next cycle. The desulfurization towers B to C are identical to the circulation steps of the desulfurization tower A, but are staggered in time from each other, as shown in FIGS. 3 and 4.
The number of the desulfurizing towers in a desulfurizing state can be 1 or more than 1, the specific number is determined according to the empty tower speed, the operating pressure and the treatment gas amount, and the device can preserve heat and accompany heat of pipelines at the temperature higher than the normal temperature.
The result of the embodiment is to obtain high-purity elemental sulfur, save a large amount of desulfurizer, have no waste gas emission, and produce waste residue without pollutants, thereby not only obtaining good economic benefit, but also reducing environmental pollution.
Compared with the prior art, the method saves the operation cost by about 60 percent.
Example 3 of the present invention
The composition, pressure and temperature of the sulfur-containing feed gas in this example were exactly the same as in example 1.
As shown in fig. 5, 4 desulfurization towers a-D constitute a temperature-varying desulfurization regeneration device, wherein the desulfurization tower is filled with a filler and a desulfurizing agent from bottom to top, and the temperature-varying desulfurization regeneration procedure of sulfur is carried out by cooling and recovering the circulating gas after single-tower desulfurization, two-tower heating, single-tower cooling and cooling; and fig. 6 shows a timing chart (atmospheric adsorption) of cooling of the circulating gas after the single-tower desulfurization, the two-tower heating, the single-tower cooling, and the cooling tower to the sulfur temperature swing desulfurization regeneration, wherein TL in fig. 6 represents the desulfurization, DJR represents the heating regeneration of the circulating gas after the recovery of sulfur, GJR represents the heating regeneration of the circulating gas after the heater, and LQ represents the cooling.
Now, the process of the desulfurization tower of the temperature-variable desulfurization regeneration device of the present embodiment in one cycle will be described by taking tower a as an example and referring to fig. 5 and 6. And opening the valves 1A and 2A simultaneously, allowing the semi-water gas to enter a desulfurizing tower A, selectively converting organic sulfur and inorganic sulfur in the semi-water gas into elemental sulfur by using a desulfurizing agent in the desulfurizing tower A, and allowing the desulfurized purified gas to enter the next section. After the desulfurizing agent in the desulfurizing tower A is subjected to desulfurization saturation, the following regeneration steps are carried out on the monomer sulfur in the desulfurizing agent:
the first step is as follows: firstly opening valves 4A and 8A, heating the desulfurizer in the desulfurizing tower A by using the circulating gas which is discharged from the sulfur recovery cooler and has recovered sulfur, then opening valves 5A and 6A, and heating the desulfurizer in the desulfurizing tower A by using the high-temperature circulating gas which is discharged from the circulating gas heater and has the temperature of 350 ℃;
the second step is that: and (3) after the high-temperature circulating gas enters a desulfurizer in the desulfurizing tower A for heating, the high-temperature circulating gas enters a sulfur recovery cooler through a valve 6A, the desulfurizer in the desulfurizing tower D is cooled by the circulating gas after being cooled in the fifth step, the temperature of the circulating gas is cooled to be below 150 ℃, and meanwhile, liquid sulfur is obtained. When the temperature of the high-temperature circulating gas after heating the desulfurizer in the desulfurizing tower A is lower than or equal to the temperature of the circulating gas after cooling the desulfurizer in the desulfurizing tower D in the 'fifth step', the circulating gas after cooling the desulfurizer in the desulfurizing tower D in the 'fifth step' does not enter a sulfur recovery cooler, and enters the circulating gas heating gas from a bypass valve to be heated;
the third step: circulating gas from the sulfur recovery cooler firstly enters a desulfurizer in a desulfurizing tower B through valves 4B and 8B for heating, then enters a water cooler through a valve 8B for cooling by circulating water, and is cooled to normal temperature;
the fourth step: after the normal-temperature circulating gas from the water cooler is pressurized to 20KPa through a blower, the normal-temperature circulating gas enters a desulfurizing tower D which finishes sulfur analysis by opening valves 3D and 7D, and a desulfurizing agent in the desulfurizing tower D is cooled to the desulfurizing temperature of 40-50 ℃;
the fifth step: cooling the circulating gas after the desulfurizer in the desulfurizing tower D, feeding the circulating gas into a sulfur recovery cooler through a valve 7D to cool the circulating gas which enters the sulfur recovery cooler through a valve 6A, feeding the circulating gas into a circulating gas heater to heat the circulating gas to 350 ℃, and then feeding the circulating gas into the desulfurizer in the desulfurizing tower A to heat and regenerate;
and a sixth step: and after the elemental sulfur of the desulfurizer in the desulfurizing tower A is analyzed, closing the valves 5A and 6A, and stopping heating the desulfurizer in the desulfurizing tower A by using high-temperature circulating gas at the temperature of 350 ℃. Then, opening valves 3A and 7A, cooling the desulfurizer in the desulfurizing tower A to the desulfurizing temperature of 40-50 ℃ by using normal-temperature circulating gas from the water cooler,
thus, the desulfurizer in the desulfurizing tower A is regenerated, enters the semi-water gas again for desulfurization, and enters the next cycle.
Thus, the desulfurizing tower A completes one cycle and can enter the next cycle. The desulfurization towers B to D are identical to the circulation steps of the desulfurization tower A, but are staggered in time from each other, as shown in FIGS. 5 and 6.
The number of the desulfurizing towers in a desulfurizing state can be 1 or more than 1, the specific number is determined according to the empty tower speed, the operating pressure and the treatment gas amount, and the device can preserve heat and accompany heat of pipelines at the temperature higher than the normal temperature.
The result of the embodiment is to obtain high-purity elemental sulfur, save a large amount of desulfurizer, have no waste gas emission, and produce waste residue without pollutants, thereby not only obtaining good economic benefit, but also reducing environmental pollution.
Compared with the prior art, the method saves the operation cost by about 70 percent.
Example 4 of the invention
The composition, pressure and temperature of the sulfur-containing feed gas in this example were exactly the same as in example 1.
As shown in fig. 7, 5 desulfurization towers a to E constitute a temperature-varying desulfurization regeneration device, wherein the desulfurization tower is filled with a filler and a desulfurizing agent from bottom to top, and a temperature-varying desulfurization regeneration procedure of sulfur is carried out by cooling and recovering the circulating gas after single-tower desulfurization, two-tower heating, two-tower cooling and cooling; and fig. 8 shows a timing chart (atmospheric adsorption) of cooling of the circulating gas by the sulfur temperature swing desulfurization regeneration after the single-tower desulfurization, the two-tower heating, the two-tower cooling, and the cooling tower, wherein TL in fig. 8 represents desulfurization, DJR represents heating regeneration of the circulating gas after sulfur recovery, GJR represents heating regeneration of the circulating gas after the heater, GLQ represents high-temperature cooling, and DLQ represents low-temperature cooling.
Now, the process of the desulfurization tower of the temperature-variable desulfurization regeneration device of the present embodiment in one cycle will be described with reference to fig. 7 and 8 by taking tower a as an example. And opening the valves 1A and 2A simultaneously, allowing the semi-water gas to enter a desulfurizing tower A, selectively converting organic sulfur and inorganic sulfur in the semi-water gas into elemental sulfur by using a desulfurizing agent in the desulfurizing tower A, and allowing the desulfurized purified gas to enter the next section. After the desulfurizing agent in the desulfurizing tower A is subjected to desulfurization saturation, the following regeneration steps are carried out on the monomer sulfur in the desulfurizing agent:
the first step is as follows: firstly opening valves 4A and 9A, heating the desulfurizer in the desulfurizing tower A by using the circulating gas which is discharged from the sulfur recovery cooler and has recovered sulfur, then opening valves 6A and 7A, and heating the desulfurizer in the desulfurizing tower A by using the high-temperature circulating gas which is discharged from the circulating gas heater and has the temperature of 350 ℃;
the second step is that: after entering a desulfurizer in a desulfurizing tower A for heating, the high-temperature circulating gas enters a sulfur recovery cooler through a valve 7A, and the circulating gas after cooling the desulfurizer in a desulfurizing tower E in the fifth step exchanges heat, so that the temperature of the circulating gas is cooled to be below 150 ℃, and meanwhile, liquid sulfur is obtained. When the temperature of the high-temperature circulating gas after heating the desulfurizer in the desulfurizing tower A is lower than or equal to the temperature of the circulating gas after cooling the desulfurizer in the desulfurizing tower E in the 'fifth step', the circulating gas after cooling the desulfurizer in the desulfurizing tower E in the 'fifth step' does not enter a sulfur recovery cooler, and enters the circulating gas heating gas from a bypass valve to be heated;
the third step: circulating gas from the sulfur recovery cooler firstly enters a desulfurizer in a desulfurizing tower B through valves 4B and 9B for heating, then enters a water cooler through a valve 9B for cooling by circulating water, and is cooled to normal temperature;
the fourth step: after the normal-temperature circulating gas from the water cooler is pressurized to 20KPa through a blower, the normal-temperature circulating gas enters a desulfurizing tower D which is regenerated and cooled initially by opening valves 3D and 8D, a desulfurizing agent in the desulfurizing tower D is cooled to the desulfurizing temperature of 40-50 ℃, meanwhile, the valves 8E and 5E are opened, the normal-temperature circulating gas enters a desulfurizing tower E which is regenerated and cooled initially, and the desulfurizing agent in the desulfurizing tower E is cooled;
the fifth step: the circulating gas after cooling the desulfurizer in the desulfurizing tower E enters a sulfur recovery cooler through a valve 5E to cool and heat the circulating gas after the desulfurizer in the desulfurizing tower A is removed, then enters a circulating gas heater to heat the circulating gas to 350 ℃, and then enters the desulfurizer in the desulfurizing tower A to be heated and regenerated.
And a sixth step: and after the elemental sulfur of the desulfurizer in the desulfurizing tower A is analyzed, closing the valves 4A and 9A, and stopping heating the desulfurizer in the desulfurizing tower A by using high-temperature circulating gas at the temperature of 350 ℃. Then, the valves 8A and 5A are opened firstly, the circulating gas after cooling the desulfurizer in the desulfurizing tower E is used for cooling the desulfurizer in the desulfurizing tower A through the valve 8E, then the valves 3A and 8A are opened firstly, the normal-temperature circulating gas from the water cooler is used for cooling the desulfurizer in the desulfurizing tower A to the desulfurization temperature of 40-50 ℃,
thus, the desulfurizer in the desulfurizing tower A is regenerated, enters the semi-water gas again for desulfurization, and enters the next cycle.
Thus, the desulfurizing tower A completes one cycle and can enter the next cycle. The desulfurization towers B to E are identical to the circulation steps of the desulfurization tower A, but are staggered in time from each other, as shown in FIGS. 7 and 8.
The number of the desulfurizing towers in a desulfurizing state can be 1 or more than 1, the specific number is determined according to the empty tower speed, the operating pressure and the treatment gas amount, and the device can preserve heat and accompany heat of pipelines at the temperature higher than the normal temperature.
The result of the embodiment is to obtain high-purity elemental sulfur, save a large amount of desulfurizer, have no waste gas emission, and produce waste residue without pollutants, thereby not only obtaining good economic benefit, but also reducing environmental pollution.
Compared with the prior art, the method saves the operation cost by about 75 percent.
Example 5 of the present invention
The composition, pressure and temperature of the sulfur-containing feed gas in this example were exactly the same as in example 1.
As shown in fig. 9, 6 desulfurization towers a to F constitute a temperature-variable desulfurization regeneration device, wherein the desulfurization tower is filled with a filler and a desulfurizing agent from bottom to top, and the temperature-variable desulfurization regeneration procedure of cooling the circulating gas after single-tower desulfurization, three-tower heating, two-tower cooling and cooling tower is operated; fig. 10 shows a timing chart of cooling of the circulating gas after the single-tower desulfurization, the three-tower heating, the two-tower cooling, and the cooling tower for sulfur temperature swing desulfurization regeneration (atmospheric adsorption), where TL in fig. 10 indicates desulfurization, DJR1 indicates heating regeneration by the circulating gas after sulfur recovery, DJR2 indicates heating by the circulating gas after sulfur recovery, DJR1 indicates reheating, GJR indicates heating regeneration by the circulating gas after the heater, GLQ indicates high-temperature cooling, and DLQ indicates low-temperature cooling.
Now, the process of the desulfurization tower of the temperature-variable desulfurization regeneration device of the present embodiment in one cycle will be described with reference to fig. 9 and 10 by taking tower a as an example. And opening the valves 1A and 2A simultaneously, allowing the semi-water gas to enter a desulfurizing tower A, selectively converting organic sulfur and inorganic sulfur in the semi-water gas into elemental sulfur by using a desulfurizing agent in the desulfurizing tower A, and allowing the desulfurized purified gas to enter the next section. After the desulfurizing agent in the desulfurizing tower A is subjected to desulfurization saturation, the following regeneration steps are carried out on the monomer sulfur in the desulfurizing agent:
the first step is as follows: simultaneously opening valves 4A and 9A, firstly heating the desulfurizer in the desulfurizing tower A by using the circulating gas for heating the desulfurizing tower F from the valve 9F, then opening valves 5A and 9A to heat the desulfurizer in the desulfurizing tower A by using the circulating gas for recovering sulfur from the sulfur recovery cooler, and finally opening valves 7A and 8A to heat the desulfurizer in the desulfurizing tower A by using the high-temperature circulating gas with the temperature of 350 ℃ from the circulating gas heater;
the second step is that: after entering a desulfurizer in a desulfurizing tower A for heating, the high-temperature circulating gas enters a sulfur recovery cooler through a valve 8A, and the circulating gas after cooling the desulfurizer in a desulfurizing tower F in the fifth step exchanges heat, so that the temperature of the circulating gas is cooled to be below 150 ℃, and meanwhile, liquid sulfur is obtained. When the temperature of the high-temperature circulating gas after heating the desulfurizer in the desulfurizing tower A is lower than or equal to the temperature of the circulating gas after cooling the desulfurizer in the desulfurizing tower F in the 'fifth step', the circulating gas after cooling the desulfurizer in the desulfurizing tower F in the 'fifth step' does not enter a sulfur recovery cooler, and enters the circulating gas heating gas from a bypass valve to be heated;
the third step: circulating gas from the sulfur recovery cooler firstly enters a desulfurizer in a desulfurizing tower C for heating through valves 5C and 9C, then enters a desulfurizer in a desulfurizing tower B for heating through valves 9B and 4B, and finally enters a water cooler for cooling through a valve 4B by circulating water, and the circulating gas is cooled to normal temperature;
the fourth step: after the normal-temperature circulating gas from the water cooler is pressurized to 20KPa through a blower, the normal-temperature circulating gas enters a desulfurizing tower E which is regenerated and cooled initially by opening valves 3E and 10E, a desulfurizing agent in the desulfurizing tower E is cooled to the desulfurizing temperature of 40-50 ℃, meanwhile, valves 10F and 6F are opened, the normal-temperature circulating gas enters a desulfurizing tower F which is regenerated, and the desulfurizing agent in the desulfurizing tower F is cooled;
the fifth step: the circulating gas after cooling the desulfurizer in the desulfurizing tower A enters a sulfur recovery cooler through a valve 6A to cool and heat the desulfurizer, then enters a circulating gas heater to heat the circulating gas to 350 ℃, and then enters the desulfurizer in the desulfurizing tower A to be heated and regenerated.
And a sixth step: and after the elemental sulfur of the desulfurizer in the desulfurizing tower A is analyzed, closing the valves 4A and 9A, and stopping heating the desulfurizer in the desulfurizing tower A by using high-temperature circulating gas at the temperature of 350 ℃. Then, the valves 10A and 6A are opened firstly, the circulating gas after cooling the desulfurizer in the desulfurizing tower F is used for cooling the desulfurizer in the desulfurizing tower A through the valve 10F, then the valves 3A and 10A are opened firstly, the normal-temperature circulating gas from the water cooler is used for cooling the desulfurizer in the desulfurizing tower A to the desulfurization temperature of 40-50 ℃,
when the desulfurizer in the desulfurizing tower A is heated to 290 ℃, the heating of the desulfurizer in the desulfurizing tower A is stopped, so that the desulfurizer in the desulfurizing tower A is regenerated, enters semi-water gas again for desulfurization, and enters the next cycle.
Thus, the desulfurizing tower A completes one cycle and can enter the next cycle. The desulfurization towers B to F are identical to the circulation steps of the desulfurization tower A, but are staggered in time from each other, as shown in FIGS. 9 and 10.
The number of the desulfurizing towers in a desulfurizing state can be 1 or more than 1, the specific number is determined according to the empty tower speed, the operating pressure and the treatment gas amount, and the device can preserve heat and accompany heat of pipelines at the temperature higher than the normal temperature.
The result of the embodiment is to obtain high-purity elemental sulfur, save a large amount of desulfurizer, have no waste gas emission, and produce waste residue without pollutants, thereby not only obtaining good economic benefit, but also reducing environmental pollution.
Compared with the prior art, the method saves the operation cost by about 80 percent.
In the above 5 examples, when the pressure of the feed gas is greater than or equal to 20KPa, after the desulfurization of the desulfurization tower is finished, the gas in the desulfurization tower is firstly released from the bottom and reduced to normal pressure, and then the regeneration is started from the first step.

Claims (15)

1. A method for regenerating elemental sulfur as a desulfurizer in a desulfurizing tower is characterized in that a sulfur-containing feed gas firstly enters a desulfurizing tower filled with the desulfurizer, purified gas after desulfurization enters the next process, the desulfurizer in the desulfurizing tower converts sulfide into elemental sulfur, and the elemental sulfur in the desulfurizer undergoes the following regeneration steps after the desulfurizer is desulfurized and saturated:
the first step is as follows: high-temperature circulating gas from a circulating gas heater enters a desulfurizer to be heated, and the temperature of the desulfurizer is heated to be higher than the melting point of elemental sulfur;
the second step is that: heating the desulfurizer by high-temperature circulating gas, then cooling the high-temperature circulating gas by using external cooling gas in a sulfur recovery cooler, cooling the circulating gas to a temperature above the melting point of elemental sulfur, and simultaneously obtaining liquid sulfur;
the third step: circulating gas from the sulfur recovery cooler enters a water cooler to exchange heat with circulating water, and the circulating gas is cooled to normal temperature;
the fourth step: after the normal-temperature circulating gas from the water cooler is boosted by power equipment, the normal-temperature circulating gas enters a desulfurizing agent which is regenerated, and the desulfurizing agent is cooled to the desulfurization temperature;
the fifth step: the circulating gas after cooling the desulfurizer enters a circulating gas heater to be heated, and then enters another desulfurizing tower for completing desulfurization to be heated and regenerated;
and a sixth step: when the elemental sulfur of the desulfurizer in the desulfurizing tower is resolved, the heating of the desulfurizer in the desulfurizing tower by high-temperature circulating gas is stopped, then the normal-temperature circulating gas from the water cooler is used for cooling the desulfurizer in the desulfurizing tower to the desulfurizing temperature,
thus, the desulfurizer in the desulfurizing tower is regenerated, and enters the sulfur-containing feed gas again for desulfurization, and enters the next cycle.
2. The method for regenerating the elemental sulfur as the desulfurizing agent in the desulfurizing tower as claimed in claim 1, wherein after the desulfurizing agent in the desulfurizing tower is saturated in the 'first step', the circulating gas from the sulfur recovery cooler is firstly used for heating, and then the high-temperature circulating gas from the circulating gas heater is used for heating the desulfurizing agent, so as to heat the desulfurizing agent to a temperature higher than the melting point of the elemental sulfur; meanwhile, in the third step, the circulating gas from the sulfur recovery cooler enters the desulfurizing agent which is just desulfurized to be heated, and then enters the water cooler to exchange heat with the circulating water, so that the circulating gas is cooled to the normal temperature.
3. The method for regenerating the elemental sulfur as the desulfurizing agent in the desulfurizing tower as claimed in claim 1, wherein after the desulfurizing agent in the desulfurizing tower is saturated in the 'first step', the circulating gas after heating the desulfurizing agent in other desulfurizing towers is firstly used for heating, then the circulating gas from the sulfur recovery cooler is used for heating, finally the high-temperature circulating gas from the circulating gas heater is used for heating, and the temperature of the desulfurizing agent is heated to be higher than the melting point of the elemental sulfur; meanwhile, in the third step, the circulating gas from the sulfur recovery cooler enters the desulfurizing tower which is heated for the first time, then enters the desulfurizing agent which is just desulfurized for heating, and finally enters the water cooler for exchanging heat with the circulating water, so that the circulating gas is cooled to the normal temperature.
4. The method for regenerating the elemental sulfur as the desulfurizing agent in the desulfurizing tower according to claim 1, wherein after the desulfurizing agent in the desulfurizing tower is saturated in the 'first step', circulating gas with different temperatures after heating the desulfurizing agent in other desulfurizing towers is used for heating in series for more than 2 times, the circulating gas from the sulfur recovery cooler is used for heating, and finally high-temperature circulating gas from a circulating gas heater is used for heating the desulfurizing agent to heat the desulfurizing agent to a temperature higher than the melting point of the elemental sulfur; meanwhile, in the third step, the circulating gas from the sulfur recovery cooler enters a desulfurizing tower which is heated for more than 2 times to be heated, then enters more than 2 desulfurizing agents which are used for completing desulfurization to be heated in series, and finally enters a water cooler to exchange heat with the circulating water to cool the circulating gas to the normal temperature.
5. The method for regenerating the elemental sulfur of the desulfurizing agent in the desulfurizing tower according to any one of claims 1 to 4, wherein the normal temperature recycle gas from the water cooler in the 'fourth step' is subjected to pressure increase by a power plant, and then is serially connected into more than 2 desulfurizing agents in the desulfurizing towers with different temperatures, and the desulfurizing agent in the first desulfurizing tower is cooled to the desulfurizing temperature.
6. The method for regenerating the elemental sulfur of the desulfurizing agent in the desulfurizing tower according to any one of claims 1 to 4, wherein the high-temperature circulating gas in the second step heats the desulfurizing agent, then enters the sulfur recovery cooler, and is cooled by the circulating gas after the desulfurizing agent is cooled in the fifth step, the temperature of the high-temperature circulating gas after the desulfurizing agent is heated is cooled to be higher than the melting point of the elemental sulfur, and meanwhile, liquid sulfur is obtained; meanwhile, the circulating gas after cooling the desulfurizer in the fifth step firstly enters a sulfur recovery cooler to cool the circulating gas after the high-temperature circulating gas heats the desulfurizer, and then enters a circulating gas heater to be heated and then enters another desulfurizing tower to finish desulfurizing, wherein the desulfurizing agent is heated and regenerated.
7. The method for regenerating the elemental sulfur of the desulfurizing agent in the desulfurizing tower according to any one of claims 1 to 4, wherein when the temperature of the high-temperature circulating gas after heating the desulfurizing agent in the 'second step' is lower than the cooling temperature of the circulating gas after cooling the desulfurizing agent in the 'fifth step', the circulating gas after cooling the desulfurizing agent in the 'fifth step' does not enter the sulfur recovery cooler, but directly enters the circulating gas heater through a bypass to be heated, and then enters another desulfurizing tower which completes the desulfurization to be heated and regenerated.
8. The method for regenerating elemental sulfur as a desulfurizing agent in a desulfurizing tower according to any one of claims 1 to 4, wherein the first step comprises: high-temperature circulating gas from a circulating gas heater enters the desulfurizer to be heated, and the temperature of the desulfurizer is heated to 260-450 ℃.
9. The method for regenerating elemental sulfur as a desulfurizing agent in a desulfurizing tower according to any one of claims 1 to 4, wherein the second step comprises: and the circulating gas after heating the desulfurizer enters a sulfur recovery cooler to exchange heat with low-temperature gas, the temperature of the circulating gas is cooled to be over 130 ℃, and liquid sulfur is obtained at the same time.
10. The method for regenerating the elemental sulfur as the desulfurizing agent in the desulfurizing tower according to any one of claims 1 to 4, wherein the pressure of the sulfur-containing raw material gas is 0 to 10.0MPa gauge pressure.
11. The method for regenerating the elemental sulfur of the desulfurizing agent in the desulfurizing tower according to any one of claims 1 to 4, wherein the pressure of the circulating gas in the heating and cooling desulfurizing agent is 0.001 to 0.2MPa gauge.
12. The method for regenerating the elemental sulfur as a desulfurizing agent in the desulfurizing tower according to any one of claims 1 to 4, wherein all the pipes are insulated and accompanied by heat.
13. The method for regenerating the elemental sulfur as the desulfurizing agent in the desulfurizing tower according to any one of claims 1 to 4, wherein when the pressure of the sulfur-containing raw material is higher than the normal pressure, the desulfurizing agent in the desulfurizing tower is saturated, and then the pressure in the desulfurizing tower is reduced to the normal pressure and then the heating regeneration is carried out.
14. The method for regenerating the elemental sulfur of the desulfurizing agent in the desulfurizing tower according to any one of claims 1 to 4, wherein the desulfurizing agent is selected from the group consisting of various activated carbons, various molecular sieves, silica gel, and alumina.
15. The method for regenerating the elemental sulfur as the desulfurizing agent in the desulfurizing tower according to any one of claims 1 to 4, wherein the oxygen volume fraction content of the circulating gas in the heating and cooling desulfurizing agent is less than 0.1%.
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CN106955595B (en) * 2017-04-19 2020-03-20 成都天立化工科技有限公司 Regeneration method of desulfurizer elemental sulfur in desulfurizing tower
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