WO2018192542A1 - Regeneration method for desulfurizer elementary substance sulfur in desulfurization column - Google Patents

Abstract

Disclosed is a regeneration method for a desulfurizer elementary substance sulfur in a desulfurization column, wherein elementary substance sulfur is subjected to the following steps after the desulfurization and saturation of a desulfurizer: a high temperature circulating gas enters the desulfurizer for heating and heats to a temperature not less than the melting point of the elementary substance sulfur; the high-temperature circulating gas enters a sulfur recovery cooler for cooling after heating the desulfurizer, and is cooled to a temperature not less than the melting point of the elementary substance sulfur to obtain liquid sulfur; the circulating gas which exits from the sulfur recovery cooler exchanges heat with circulating water and is cooled to normal temperature; the normal temperature circulating gas is subjected to pressure increase and then enters the desulfurizer that has undergone regeneration, and cools same to the desulfurization temperature; the circulating gas, after cooling the desulfurizer, is heated and then enters another desulfurization column to be heated and regenerated by the desulfurizing agent; when the desorption of the elementary substance sulfur of the desulfurizer in the desulfurization column is completed, the heating of the desulfurizer in the desulfurization column is stopped. The normal temperature circulating gas which exits from a water cooler cools the desulfurizer in the desulfurization column to the desulfurization temperature, and the regeneration of the desulfurizer in the desulfurization column is completed.

Description

Method for regenerating elemental sulfur of desulfurization agent in desulfurization tower Technical field

The invention relates to a method for regenerating elemental sulfur in a desulfurizing agent, which adopts high temperature regeneration and belongs to the technical field of desulfurization.

Background technique

At present, the removal of sulfides in the mixture mainly includes wet desulfurization and dry desulfurization, wet desulfurization and physical desulfurization and chemical desulfurization, physical desulfurization such as low temperature methanol washing, carbonic acid and NHD, etc. Desulfurization such as ammonia water method, ammonia liquid phase catalytic method, examination method, PDS method, modified ADA method, etc., physical desulfurization adopts absorption and analytical methods, and does not change the form and properties of sulfide, and only concentrates it. Chemical desulfurization changes the form of sulfides and directly obtains elemental sulfur. Chemical desulfurization can only remove inorganic sulfur hydrogen sulfide, can not remove organic sulfur, organic sulfur must be removed by dry method. The physical method can remove inorganic sulfur and remove organic sulfur, but the physical method can not directly obtain the elemental sulfur, and the elemental sulfur must be obtained by the Claus sulfur recovery process. In the chemical method plus dry method to remove organic sulfur and inorganic sulfur, the dry desulfurizer has low sulfur capacity, the cost of the elemental sulfur in the regenerated dry desulfurizer is high, and the regeneration gas is emptied to pollute the environment, so the sulfur content of the general desulfurizer Directly landfilled or burned after saturation, no regeneration; physical method plus Claus sulfur recovery process to remove organic sulfur and inorganic sulfur, although the cost is relatively low, but the investment is high, and the sulfur content of the exhaust gas does not reach the country Environmental protection regulations, high cost of reprocessing waste gas. In the removal of sulfur dioxide from flue gas, sulfur dioxide can be converted into elemental sulfur in a desulfurizing agent, and then sulfur is obtained by the present regeneration method.

Summary of the invention

The object of the present invention is to provide a dry method (ie, a desulfurizing agent) for removing organic sulfur and inorganic sulfur to form elemental sulfur and recovering the elemental sulfur by using high-temperature circulating gas, which greatly saves operating cost and investment compared with the prior art. Advantages, and no regenerative exhaust emissions, reducing environmental pollution.

The technical solution of the present invention is as follows:

The sulfur-containing feed gas first enters the desulfurization tower containing the desulfurization agent, and the purified gas after desulfurization enters the next process. The desulfurization agent in the desulfurization tower converts the sulfide into elemental sulfur, and after the desulfurization agent is desulphurized and saturated, the sulfur in the desulfurizer is single sulfur. Experience the following regeneration steps:

The sulfur-containing feed gas first enters the desulfurization tower containing the desulfurization agent, and the purified gas after desulfurization enters the next process. The desulfurization agent in the desulfurization tower converts the sulfide into elemental sulfur, and after the desulfurization agent is desulphurized and saturated, the sulfur in the desulfurizer is single sulfur. Experience the following regeneration steps:

The first step: heating the high-temperature circulating gas from the circulating gas heater into the desulfurizing agent, and heating the temperature of the desulfurizing agent to above the melting point of the elemental sulfur;

The second step: the high temperature circulating gas heats the desulfurizing agent and then enters the sulfur recovery cooler to be cooled by the external cooling gas, and the circulating gas temperature is cooled to above the melting point of the elemental sulfur, and the liquid sulfur is obtained at the same time;

The third step: the circulating gas from the sulfur recovery cooler enters the water cooler to exchange heat with the circulating water, and cools the circulating gas to normal temperature;

The fourth step: the normal temperature circulating gas coming out of the water cooler, after being boosted by the power equipment, enters into the desulfurizing agent that has been regenerated, and cools the desulfurizing agent to the desulfurization temperature;

The fifth step: cooling the circulating gas after the desulfurizing agent, after entering the circulating gas heater is heated, and then entering another desulfurization tower for desulfurization to be heated and regenerated by the desulfurizing agent;

Step 6: After the analysis of the elemental sulfur of the desulfurizing agent in the desulfurization tower is completed, the high temperature circulating gas is stopped to heat the desulfurizing agent in the desulfurization tower. Then, the normal temperature circulating gas from the water cooler cools the desulfurizing agent in the desulfurization tower to the desulfurization temperature.

In this way, the desulfurization agent in the desulfurization tower is regenerated, and the sulfur-containing feed gas is again introduced for desulfurization to enter the next cycle.

Further, after the desulfurizing agent in the 'first step' desulfurization tower is saturated, the circulating gas from the sulfur recovery cooler is used for heating, and then the high temperature circulating gas from the circulating gas heater is used to enter the desulfurizing agent for heating. The temperature of the desulfurizing agent is heated to above the melting point of the elemental sulfur. At the same time, the "third step" of the recycle gas from the sulfur recovery cooler first enters the desulfurization agent which has just completed desulfurization, and then enters the water cooler to exchange heat with the circulating water to cool the circulating gas to normal temperature.

Further, after the desulfurization agent in the 'first step' desulfurization tower is saturated, the circulation gas heated by the desulfurization agent in the other desulfurization tower is heated, and then the circulation gas from the sulfur recovery cooler is used for heating, and finally, The high-temperature circulating gas from the circulating gas heater enters the desulfurizing agent for heating, and the desulfurizing agent temperature is heated to above the melting point of the elemental sulfur. At the same time, the 'third step' of the circulating gas from the sulfur recovery cooler first enters the desulfurization tower which has completed the first heating, then enters the desulfurization agent which has just completed the desulfurization, and finally enters the water cooler to exchange heat with the circulating water. Cool the circulating gas to normal temperature.

Further, after the desulfurization agent in the 'first step' desulfurization tower is saturated, the two different temperature circulating gases after heating the desulfurization agent in the other desulfurization tower are used for two or more times of series heating, and then the cooler is recovered from the sulfur. The circulating gas that has come out enters for heating, and finally, the high-temperature circulating gas from the circulating gas heater enters the desulfurizing agent for heating, and the temperature of the desulfurizing agent is heated to above the melting point of the elemental sulfur. At the same time, the 'third step' recycle gas from the sulfur recovery cooler first enters the desulfurization tower which has been completed 2 times or more, and then enters into two or more desulfurization desulfurization agents to be heated in series. Then enter the water cooler to exchange heat with the circulating water, and cool the circulating gas to normal temperature.

Further, in the 'fourth step', the normal temperature circulating gas from the water cooler is boosted by the power equipment, and is connected in series to two or more desulfurization agents in a desulfurization tower having different temperatures that have been regenerated, and the first The desulfurizing agent in an incoming desulfurization tower is cooled to a desulfurization temperature.

Further, in the 'second step', the high-temperature circulating gas heats the desulfurizing agent and then enters the sulfur recovery cooler to cool the circulating gas after the 'fifth step' cooling desulfurizing agent, and cools the temperature of the high-temperature circulating gas heated desulfurizing agent to the elemental sulfur. Above the melting point, liquid sulfur is obtained at the same time; at the same time, the circulating gas after cooling the desulfurizing agent in the 'fifth step' first enters the sulfur recovery cooler to cool the circulating gas after the high-temperature circulating gas is heated to remove the desulfurizing agent, and then enters the circulating gas heater after being heated. , into another desulfurization tower that completes the desulfurization, the desulfurization agent is heated and regenerated.

Further, when the temperature of the high-temperature circulating gas heating desulfurizing agent in the 'second step' is lower than the circulating gas cooling temperature after the 'fifth step' cooling the desulfurizing agent, the circulating gas after cooling the desulfurizing agent in the 'fifth step' , does not enter the sulfur recovery cooler, but is directly heated into the circulating gas heater by bypass, and then enters another desulfurization desulfurization tower to be heated and regenerated.

Further, the first step: heating the high-temperature circulating gas from the circulating gas heater into the desulfurizing agent to heat the desulfurizing agent at a temperature of 260 ° C to 450 ° C.

Further, the second step: the circulating gas after heating the desulfurizing agent enters the sulfur recovery cooler to exchange heat with the low temperature gas, and cools the temperature of the circulating gas to above 130 ° C, and simultaneously obtains liquid sulfur.

Further, the pressure of the sulfur-containing raw material gas is 0 to 10.0 MPa (gauge pressure).

Further, the circulating gas pressure in the heating and cooling desulfurizing agent is 0.001 to 0.2 MPa (gauge pressure).

Further, all pipes are insulated and heat tracing.

Further, when the pressure of the sulfur-containing feed gas is higher than the normal pressure, after the desulfurization agent in the desulfurization tower is saturated, the pressure of the desulfurization tower is first lowered to a normal pressure and then heated and regenerated.

Further, the desulfurizing agent is various activated carbons, various molecular sieves, silica gel, alumina, and various special desulfurizing agents.

Further, the circulating gas in the heating and cooling desulfurizing agent has an oxygen content of less than 0.1% (V).

Compared with the prior art, the method for regenerating the sulfur of the desulfurization agent in the desulfurization tower of the present invention greatly saves the advantages of operation cost and investment, and has no regenerative exhaust gas emission and reduces environmental pollution.

DRAWINGS

1 is a flow chart (normal pressure adsorption) of a single-tower desulfurization, single-column heating, single-column cooling, and external gas cooling recovery of sulfur-reduced temperature desulfurization according to Embodiment 1 of the present invention.

2 is a timing chart (normal pressure adsorption) of the desulfurization of sulfur desulfurization by single tower desulfurization, single tower heating, single tower cooling, and external gas cooling recovery according to Embodiment 1 of the present invention.

Fig. 3 is a flow chart (normal pressure adsorption) of a regenerative process of desulfurization of a sulphur-steaming cycle after a single column desulfurization, a single column heating, a single column cooling, and a cooling tower in the second embodiment of the present invention.

4 is a timing chart (normal pressure adsorption) of a regenerative desulfurization of sulfur gas after single-column desulfurization, single-column heating, single-column cooling, and cooling tower after the single tower desulfurization, single tower heating, and cooling tower.

Fig. 5 is a flow chart (normal pressure adsorption) of the reforming of the sulphur-reduced temperature desulfurization after the single-column desulfurization, the two-column heating, the single-column cooling, and the cooling tower after the single tower desulfurization, the two-column cooling, and the cooling tower.

Fig. 6 is a timing chart (normal pressure adsorption) of the sulphur desulfurization desulfurization regeneration after the single-column desulfurization, the two-column heating, the single-column cooling, and the cooling tower after the single tower desulfurization, the two-column cooling, and the cooling tower.

Fig. 7 is a flow chart (normal pressure adsorption) of a regenerative process of desulfurization of a sulphur-reducing temperature in a single-column desulfurization, two-column heating, two-column cooling, and cooling tower after the cooling of the tower.

Fig. 8 is a timing chart (normal pressure adsorption) of the sulphur temperature change desulfurization regeneration after the single tower desulfurization, the two tower heating, the two tower cooling, and the cooling tower after the single tower desulfurization, the two towers are cooled, and the cooling tower.

Fig. 9 is a flow chart (normal pressure adsorption) of a regenerative process of desulfurization of a sulfur gas after a single column desulfurization, a three-column heating, a two-column cooling, and a cooling tower after the single tower desulfurization, the three-column cooling, and the cooling tower.

Fig. 10 is a timing chart (normal pressure adsorption) of the sulphur-reduced temperature desulfurization regeneration after the single-column desulfurization, the three-column heating, the two-column cooling, and the cooling tower after the single tower desulfurization, the three-column cooling, and the cooling tower.

detailed description

The sulfur-containing feed gas of the present invention may be synthetic ammonia shift gas, water gas, natural gas, semi-water gas, blast furnace gas, gas gas, cracked dry gas, oilfield associated gas, oil gasification, power plant flue gas, various sulfur-containing tail gas and exhaust gas, and the like. It can also be any other sulfur-containing mixed gas.

The sulfur-containing feed gas of the invention first enters into a desulfurization tower equipped with a desulfurization agent, and the purified gas after desulfurization enters the next process, and the desulfurization agent in the desulfurization tower converts the sulfide into elemental sulfur, and the desulfurization agent is desulphurized and saturated, and the desulfurization agent is Elemental sulfur undergoes the following regeneration steps:

The first step: heating the high-temperature circulating gas from the circulating gas heater into the desulfurizing agent, and heating the temperature of the desulfurizing agent to above the melting point of the elemental sulfur;

The second step: the high temperature circulating gas heats the desulfurizing agent and then enters the sulfur recovery cooler to be cooled by the external cooling gas, and the circulating gas temperature is cooled to above the melting point of the elemental sulfur, and the liquid sulfur is obtained at the same time;

The third step: the circulating gas from the sulfur recovery cooler enters the water cooler to exchange heat with the circulating water, and cools the circulating gas to normal temperature;

The fourth step: the normal temperature circulating gas coming out of the water cooler, after being boosted by the power equipment, enters into the desulfurizing agent that has been regenerated, and cools the desulfurizing agent to the desulfurization temperature;

The fifth step: cooling the circulating gas after the desulfurizing agent, after entering the circulating gas heater is heated, and then entering another desulfurization tower for desulfurization to be heated and regenerated by the desulfurizing agent;

Step 6: After the analysis of the elemental sulfur of the desulfurizing agent in the desulfurization tower is completed, the high temperature circulating gas is stopped to heat the desulfurizing agent in the desulfurization tower. Then, the normal temperature circulating gas from the water cooler cools the desulfurizing agent in the desulfurization tower to the desulfurization temperature.

In this way, the desulfurization agent in the desulfurization tower is regenerated, and the sulfur-containing feed gas is again introduced for desulfurization to enter the next cycle.

After the desulfurization agent in the 'first step' desulfurization tower is saturated, the circulating gas from the sulfur recovery cooler is used for heating, and then the high-temperature circulating gas from the circulating gas heater is used to enter the desulfurizing agent for heating, and the desulfurization is performed. The temperature of the agent is heated above the melting point of elemental sulfur. At the same time, the "third step" of the recycle gas from the sulfur recovery cooler first enters the desulfurization agent which has just completed desulfurization, and then enters the water cooler to exchange heat with the circulating water to cool the circulating gas to normal temperature.

After the desulfurization agent in the 'first step' desulfurization tower is saturated, it is heated by the circulating gas after heating the desulfurizing agent in the other desulfurization tower, and then the circulating gas from the sulfur recovery cooler is used for heating, and finally, the circulating gas is used. The high-temperature circulating gas from the heater enters the desulfurizing agent for heating, and the temperature of the desulfurizing agent is heated to above the melting point of the elemental sulfur. At the same time, the 'third step' of the circulating gas from the sulfur recovery cooler first enters the desulfurization tower which has completed the first heating, then enters the desulfurization agent which has just completed the desulfurization, and finally enters the water cooler to exchange heat with the circulating water. Cool the circulating gas to normal temperature.

After the desulfurization agent in the 'first step' desulfurization tower is saturated, the two different temperature circulating gases after heating the desulfurization agent in the other desulfurization tower are used for two or more times of series heating, and then the circulation from the sulfur recovery cooler is used. The gas enters and is heated, and finally, the high-temperature circulating gas from the circulating gas heater enters the desulfurizing agent for heating, and the temperature of the desulfurizing agent is heated to above the melting point of the elemental sulfur. At the same time, the 'third step' recycle gas from the sulfur recovery cooler first enters the desulfurization tower which has been completed 2 times or more, and then enters into two or more desulfurization desulfurization agents to be heated in series. Then enter the water cooler to exchange heat with the circulating water, and cool the circulating gas to normal temperature.

In the 'fourth step', the normal temperature circulating gas from the water cooler is boosted by the power equipment, and then two or more desulfurization agents in different desulfurization towers that have been regenerated are connected in series, and the first one is entered. The desulfurization agent in the desulfurization tower is cooled to the desulfurization temperature.

In the 'second step', the high-temperature circulating gas is heated to the desulfurizing agent, and then enters the sulfur recovery cooler. The circulating gas is cooled by the 'fifth step' cooling desulfurizing agent, and the temperature after heating the desulfurizing agent of the high-temperature circulating gas is cooled to above the melting point of the elemental sulfur. At the same time, the liquid sulfur is obtained; at the same time, the circulating gas after cooling the desulfurizing agent in the 'fifth step' first enters the sulfur recovery cooler to cool the circulating gas after the high-temperature circulating gas heats the desulfurizing agent, and then enters the circulating gas heater to be heated, and then enters another A desulfurization unit in the desulfurization tower that completes the desulfurization is heated and regenerated.

When the temperature in the 'second step' of the high-temperature circulating gas heating desulfurizing agent is lower than the circulating gas cooling temperature after the 'fifth step' cooling desulfurizing agent, the circulating gas after cooling the desulfurizing agent in the 'fifth step' does not enter. The sulfur recovery cooler is heated directly by the bypass into the circulating gas heater, and then heated and regenerated by the desulfurization agent in another desulfurization tower that completes the desulfurization.

The first step: heating the high-temperature circulating gas from the circulating gas heater into the desulfurizing agent to heat the desulfurizing agent at a temperature of 260 ° C to 450 ° C.

The second step: the circulating gas after heating the desulfurizing agent enters the sulfur recovery cooler to exchange heat with the low temperature gas, and cools the temperature of the circulating gas to above 130 ° C, and at the same time obtains liquid sulfur.

The sulfur-containing feed gas pressure is 0 to 10.0 MPa (gauge pressure).

The circulating gas pressure in the heating and cooling desulfurizing agent is 0.001 to 0.2 MPa (gauge pressure).

Keep all pipes in heat and with heat.

When the pressure of the sulfur-containing feed gas is higher than the normal pressure, after the desulfurization agent in the desulfurization tower is saturated, the pressure of the desulfurization tower is first reduced to normal pressure and then heated and regenerated.

The desulfurizing agent is various activated carbon, various molecular sieves, silica gel, alumina and various special desulfurizing agents.

The circulating gas in the heating and cooling desulfurizing agent has an oxygen content of less than 0.1% (V).

Embodiment 1 of the present invention

The sulfur-containing feed gas in this example is synthetic ammonia and semi-aqueous gas, including synthetic ammonia and semi-aqueous gas using coal, natural gas, oil and others as raw materials.

The synthetic ammonia semi-water gas of this embodiment is composed as follows:

Temperature: ≤40°C

Pressure: 0.01MPa (G)

As shown in Fig. 1, three sets of desulfurization towers A to C constitute a variable temperature desulfurization regeneration device. The desulfurization tower is filled with packing and desulfurizing agent from bottom to top, and runs single tower desulfurization, single tower heating, single tower cooling, and external gas. Cooling recovery sulfur desulfurization regeneration program; and Figure 2 shows single tower desulfurization, single tower heating, single tower cooling, external gas cooling sulfur desulfurization regeneration timing diagram (atmospheric pressure adsorption), wherein TL in Figure 2 represents desulfurization, TR indicates warm regeneration and LQ indicates cooling.

Taking the A tower as an example, referring to FIG. 1 and FIG. 2, the process of the desulfurization tower of the variable temperature desulfurization regeneration device of the present embodiment in a cycle process will be described. At the same time, valves 1A and 2A are opened, and the semi-aqueous gas enters the desulfurization tower A. The desulfurization agent in the desulfurization tower A selectively converts the organic sulfur and the inorganic sulfur in the semi-water gas into elemental sulfur, and the purified gas after the desulfurization enters the next stage. After the desulfurization agent in the desulfurization tower A is desulphurized and saturated, the elemental sulfur in the desulfurization agent undergoes the following regeneration steps:

The first step: simultaneously opening the valves 4A and 5A, and heating the desulfurizing agent entering the desulfurization tower A with a high-temperature circulating gas having a temperature of 350 ° C from the circulating gas heater;

The second step: the circulating gas after heating the desulfurizing agent in the desulfurization tower A passes through the valve 5A and enters the sulfur recovery cooler to be cooled by external ambient air, and the circulating gas temperature is cooled to below 150 ° C, and liquid sulfur is obtained at the same time. When the temperature of the circulating gas after heating the desulfurizing agent is lower than 150 ° C, the cooling with external ambient air is stopped;

The third step: the circulating gas from the sulfur recovery cooler enters the water cooler and is cooled by circulating water to cool the circulating gas to normal temperature;

The fourth step: the normal temperature circulating gas from the water cooler is boosted to 20KPa by the blower, and the desulfurization agent in the desulfurization tower C is cooled to the desulfurization temperature by opening the valves 3C and 6C into the desulfurization tower C which has completed the sulfur analysis. 40-50 ° C;

The fifth step: cooling the circulating gas after the desulfurizing agent in the desulfurization tower C, entering the circulating gas heater to heat the circulating gas to 350 ° C, and then entering the desulfurizing tower A desulfurizing agent to be heated and regenerated;

Step 6: After the analysis of the elemental sulfur of the desulfurizing agent in the desulfurization tower A is completed, the valves 4A and 5A are closed, and the high-temperature circulating gas having a temperature of 350 ° C is stopped to heat the desulfurizing agent in the desulfurization tower A. Then, the valves 3A and 6A are opened, and the desulfurizing agent in the desulfurization tower A is cooled to a desulfurization temperature of 40-50 ° C by the normal temperature circulating gas from the water cooler.

Thus, the desulfurization agent in the desulfurization tower A is completely regenerated, and again enters the semi-aqueous gas for desulfurization, and proceeds to the next cycle.

At this point, the desulfurization tower A completes one cycle and can enter the next cycle. The desulfurization towers B to C are the same as the desulfurization tower A, except that they are staggered in time, as shown in Figs. 1 and 2.

The desulfurization tower in the desulfurization state may be one or more, and the specific quantity is determined according to the superficial tower speed, the operating pressure and the treatment gas volume, and the pipeline above the normal temperature is insulated and accompanied by heat.

The result of this embodiment is that high-purity elemental sulfur is obtained, a large amount of desulfurizing agent is saved, and no exhaust gas is discharged, and the generated waste residue does not contain pollutants, which not only obtains good economic benefits but also reduces environmental pollution.

For the present embodiment, the present invention saves about 50% of operating costs compared to the prior art.

Embodiment 2 of the present invention

The composition, pressure and temperature of the sulfur-containing feed gas in this example were identical to those in Example 1.

As shown in Fig. 3, three sets of desulfurization towers A to C constitute a variable temperature desulfurization regeneration device. The bottom to top loading in the desulfurization tower is followed by packing and desulfurizing agent, and operation of single tower desulfurization, single tower heating, single tower cooling, and cooling tower. After the circulating gas is cooled, it returns to the sulfur temperature-changing desulfurization regeneration program; and FIG. 4 shows the single-tower desulfurization, single-column heating, single-column cooling, cooling tower cooling gas desulfurization desulfurization regeneration timing diagram (atmospheric pressure adsorption), Here, in Fig. 4, TL represents desulfurization, TR represents warm regeneration, and LQ represents cooling.

Taking the A tower as an example, referring to FIG. 3 and FIG. 4, the process of the desulfurization tower of the variable temperature desulfurization regeneration device of the present embodiment in a cycle process will be described. At the same time, valves 1A and 2A are opened, and the semi-aqueous gas enters the desulfurization tower A. The desulfurization agent in the desulfurization tower A selectively converts the organic sulfur and the inorganic sulfur in the semi-water gas into elemental sulfur, and the purified gas after the desulfurization enters the next stage. After the desulfurization agent in the desulfurization tower A is desulphurized and saturated, the elemental sulfur in the desulfurization agent undergoes the following regeneration steps:

The first step: simultaneously opening the valves 4A and 5A, and heating the desulfurizing agent entering the desulfurization tower A with a high-temperature circulating gas having a temperature of 350 ° C from the circulating gas heater;

The second step: heating the desulfurization agent in the desulfurization tower A, the circulating gas enters the sulfur recovery cooler through the valve 5A, and cools the circulating gas after the desulfurization agent in the desulfurization tower C is cooled by the 'fifth step', and the circulating gas temperature is cooled below 150 ° C. At the same time, liquid sulfur is obtained. When the temperature of the desulfurizing agent in the high-temperature circulating gas heating desulfurization tower A is lower than or equal to the circulating gas temperature after the desulfurizing agent in the fifth step of cooling the desulfurization tower C, the 'fifth step' cools the desulfurizing agent in the desulfurization tower C. The circulating gas does not enter the sulfur recovery cooler, and is heated from the bypass valve into the circulating gas heating gas;

The third step: the circulating gas from the sulfur recovery cooler enters the water cooler and is cooled by circulating water to cool the circulating gas to normal temperature;

The fourth step: the normal temperature circulating gas from the water cooler is boosted to 20KPa by the blower, and the desulfurization agent in the desulfurization tower C is cooled to the desulfurization temperature by opening the valves 3C and 6C into the desulfurization tower C which has completed the sulfur analysis. 40-50 ° C;

The fifth step: cooling the circulating gas after the desulfurizing agent in the desulfurization tower C, first entering the sulfur recovery cooler through the valve 6C to cool the circulating gas after heating the desulfurizing agent in the desulfurization tower A, and then entering the circulating gas heater to heat the circulating gas to 350 °C, then enter the desulfurization tower A desulfurization agent heating regeneration;

Step 6: After the analysis of the elemental sulfur of the desulfurizing agent in the desulfurization tower A is completed, the valves 4A and 5A are closed, and the high-temperature circulating gas having a temperature of 350 ° C is stopped to heat the desulfurizing agent in the desulfurization tower A. Then, the valves 3A and 6A are opened, and the desulfurizing agent in the desulfurization tower A is cooled to a desulfurization temperature of 40-50 ° C by the normal temperature circulating gas from the water cooler.

Thus, the desulfurization agent in the desulfurization tower A is completely regenerated, and again enters the semi-aqueous gas for desulfurization, and proceeds to the next cycle.

At this point, the desulfurization tower A completes one cycle and can enter the next cycle. The desulfurization towers B to C are the same as the desulfurization tower A, except that they are staggered in time, see Figs. 3 and 4.

The desulfurization tower in the desulfurization state may be one or more, and the specific quantity is determined according to the superficial tower speed, the operating pressure and the treatment gas volume, and the pipeline above the normal temperature is insulated and accompanied by heat.

The result of this embodiment is that high-purity elemental sulfur is obtained, a large amount of desulfurizing agent is saved, and no exhaust gas is discharged, and the generated waste residue does not contain pollutants, which not only obtains good economic benefits but also reduces environmental pollution.

For the present embodiment, the present invention saves about 60% of operating costs compared to the prior art.

Embodiment 3 of the present invention

The composition, pressure and temperature of the sulfur-containing feed gas in this example were identical to those in Example 1.

As shown in Fig. 5, a total of four desulfurization towers A to D constitute a variable temperature desulfurization regeneration device. The desulfurization tower is filled with packing and desulfurizing agent from bottom to top, and operates single tower desulfurization, two tower heating, single tower cooling, and cooling tower. After the cycle gas cooling to recover the sulfur temperature change desulfurization regeneration program; and Figure 6 shows the single tower desulfurization, two tower heating, single tower cooling, cooling tower after the cooling gas cooling sulfur desulfurization regeneration timing diagram (atmospheric pressure adsorption), wherein In Fig. 6, TL represents desulfurization, DJR represents regeneration of circulating gas after recovery by sulfur, GJR represents regeneration of circulating gas after heating, and LQ represents cooling.

Taking the A tower as an example, referring to FIG. 5 and FIG. 6, the process of the desulfurization tower of the variable temperature desulfurization regeneration device of the present embodiment in a cycle process will be described. At the same time, valves 1A and 2A are opened, and the semi-aqueous gas enters the desulfurization tower A. The desulfurization agent in the desulfurization tower A selectively converts the organic sulfur and the inorganic sulfur in the semi-water gas into elemental sulfur, and the purified gas after the desulfurization enters the next stage. After the desulfurization agent in the desulfurization tower A is desulphurized and saturated, the elemental sulfur in the desulfurization agent undergoes the following regeneration steps:

The first step: first open the valves 4A and 8A, and use the sulfur gas recovery gas from the sulfur recovery cooler to enter the desulfurization agent in the desulfurization tower A for heating, and then open the valves 5A and 6A, using the circulating gas heater. The high temperature circulating gas having a temperature of 350 ° C enters the desulfurizing agent in the desulfurization tower A for heating;

The second step: the high-temperature circulating gas enters the desulfurization tower A in the desulfurization agent, and then enters the sulfur recovery cooler through the valve 6A to cool the circulating gas after the desulfurization agent in the desulfurization tower D by the 'fifth step', and cools the circulating gas temperature by 150. Below the °C, liquid sulfur is obtained at the same time. When the temperature of the desulfurizing agent in the high-temperature circulating gas heating desulfurization tower A is lower than or equal to the circulating gas temperature after the desulfurizing agent in the 'fifth step' cooling desulfurization tower D, the 'fifth step' cools the desulfurizing agent in the desulfurization tower D. The circulating gas does not enter the sulfur recovery cooler, and is heated from the bypass valve into the circulating gas heating gas;

The third step: the circulating gas from the sulfur recovery cooler is heated by the desulfurizing agent in the desulfurization tower B through the valves 4B and 8B, and then enters the water cooler through the valve 8B to be cooled by circulating water, and the circulating gas is cooled to a normal temperature;

The fourth step: the normal temperature circulating gas from the water cooler is boosted to 20KPa by the blower, and the desulfurization agent in the desulfurization tower D is cooled to the desulfurization temperature by opening the valves 3D and 7D into the desulfurization tower D which has completed the sulfur analysis. 40-50 ° C;

The fifth step: cooling the circulating gas after the desulfurizing agent in the desulfurization tower D, first entering the sulfur recovery cooler through the valve 7D, cooling the circulating gas entering the sulfur recovery cooler through the valve 6A, and then entering the circulating gas heater to heat the circulating gas to 350. °C, then enter the desulfurization tower A desulfurization agent heating regeneration;

Step 6: After the analysis of the elemental sulfur of the desulfurizing agent in the desulfurization tower A is completed, the valves 5A and 6A are closed, and the high-temperature circulating gas having a temperature of 350 ° C is stopped to heat the desulfurizing agent in the desulfurization tower A. Then, the valves 3A and 7A are opened, and the desulfurizing agent in the desulfurization tower A is cooled to a desulfurization temperature of 40 to 50 ° C by the normal temperature circulating gas from the water cooler.

Thus, the desulfurization agent in the desulfurization tower A is completely regenerated, and again enters the semi-aqueous gas for desulfurization, and proceeds to the next cycle.

At this point, the desulfurization tower A completes one cycle and can enter the next cycle. The desulfurization towers B to D are the same as the desulfurization tower A, except that they are staggered in time, see Figs. 5 and 6.

The desulfurization tower in the desulfurization state may be one or more, and the specific quantity is determined according to the superficial tower speed, the operating pressure and the treatment gas volume, and the pipeline above the normal temperature is insulated and accompanied by heat.

The result of this embodiment is that high-purity elemental sulfur is obtained, a large amount of desulfurizing agent is saved, and no exhaust gas is discharged, and the generated waste residue does not contain pollutants, which not only obtains good economic benefits but also reduces environmental pollution.

For the present embodiment, the present invention saves about 70% of operating costs compared to the prior art.

Embodiment 4 of the present invention

The composition, pressure and temperature of the sulfur-containing feed gas in this example were identical to those in Example 1.

As shown in Fig. 7, a total of 5 desulfurization towers A to E constitute a variable temperature desulfurization regeneration device. The desulfurization tower is filled with packing and desulfurizing agent from bottom to top, and operates single tower desulfurization, two tower heating, two tower cooling, and cooling tower. After the cycle gas cooling to recover the sulfur temperature change desulfurization regeneration program; and Figure 8 shows the single tower desulfurization, two tower heating, two tower cooling, cooling tower after the cooling gas cooling sulfur desulfurization regeneration timing diagram (atmospheric pressure adsorption), wherein In Fig. 8, TL indicates desulfurization, DJR indicates regeneration with circulating gas after sulfur recovery, GJR indicates regeneration of circulating gas after heating, GLQ indicates high temperature cooling, and DLQ indicates low temperature cooling.

Taking the A tower as an example, referring to FIG. 7 and FIG. 8, the process of the desulfurization tower of the variable temperature desulfurization regeneration device of the present embodiment in a cycle process will be described. At the same time, valves 1A and 2A are opened, and the semi-aqueous gas enters the desulfurization tower A. The desulfurization agent in the desulfurization tower A selectively converts the organic sulfur and the inorganic sulfur in the semi-water gas into elemental sulfur, and the purified gas after the desulfurization enters the next stage. After the desulfurization agent in the desulfurization tower A is desulphurized and saturated, the elemental sulfur in the desulfurization agent undergoes the following regeneration steps:

The first step: first open the valves 4A and 9A, and use the desulfurizing agent that has recovered the sulfur from the sulfur recovery cooler to enter the desulfurization tower A for heating, and then open the valves 6A and 7A, using the circulating gas heater. The high temperature circulating gas having a temperature of 350 ° C enters the desulfurizing agent in the desulfurization tower A for heating;

The second step: the high-temperature circulating gas enters the desulfurization tower A in the desulfurization agent, and then enters the sulfur recovery cooler through the valve 7A to cool the circulating gas heat exchange after the desulfurization agent in the desulfurization tower E by the 'fifth step', and cools the circulating gas temperature. Below 150 ° C, liquid sulfur is obtained at the same time. When the temperature of the desulfurizing agent in the high-temperature circulating gas heating desulfurization tower A is lower than or equal to the circulating gas temperature after the desulfurizing agent in the fifth step of cooling the desulfurization tower E, the 'fifth step' cools the desulfurizing agent in the desulfurization tower E. The circulating gas does not enter the sulfur recovery cooler, and is heated from the bypass valve into the circulating gas heating gas;

The third step: the circulating gas from the sulfur recovery cooler is heated by the desulfurizing agent in the desulfurization tower B through the valves 4B and 9B, and then enters the water cooler through the valve 9B to be cooled by circulating water, and the circulating gas is cooled to a normal temperature;

The fourth step: the normal temperature circulating gas from the water cooler is boosted to 20KPa by the blower, and then the desulfurization tower D in the desulfurization tower D is cooled by opening the valves 3D and 8D into the desulfurization tower D which has been regenerated and initially cooled. Desulfurization temperature 40-50 ° C, while opening the valves 8E and 5E into the desulfurization tower E that has been regenerated, cooling the desulfurization agent in the desulfurization tower E;

The fifth step: cooling the circulating gas after the desulfurizing agent in the desulfurization tower E, first entering the sulfur recovery cooler through the valve 5E to cool the circulating gas after the desulfurizing agent is removed in the heating desulfurization tower A, and then entering the circulating gas heater to heat the circulating gas to At 350 ° C, the desulfurizing agent entering the desulfurization tower A is then heated and regenerated.

Step 6: After the analysis of the elemental sulfur of the desulfurizing agent in the desulfurization tower A is completed, the valves 4A and 9A are closed, and the high-temperature circulating gas having a temperature of 350 ° C is stopped to heat the desulfurizing agent in the desulfurization tower A. Then, the valves 8A and 5A are first opened, and the desulfurizing agent in the desulfurization tower A is cooled by the circulating gas after cooling the desulfurizing agent in the desulfurization tower E through the valve 8E, and then the valves 3A and 8A are opened first, and the normal temperature circulating gas which is discharged from the water cooler is used. Cooling the desulfurizing agent in the desulfurization tower A to a desulfurization temperature of 40-50 ° C,

Thus, the desulfurization agent in the desulfurization tower A is completely regenerated, and again enters the semi-aqueous gas for desulfurization, and proceeds to the next cycle.

At this point, the desulfurization tower A completes one cycle and can enter the next cycle. The desulfurization towers B to E are the same as the desulfurization tower A, except that they are staggered in time, see Figs. 7 and 8.

The desulfurization tower in the desulfurization state may be one or more, and the specific quantity is determined according to the superficial tower speed, the operating pressure and the treatment gas volume, and the pipeline above the normal temperature is insulated and accompanied by heat.

The result of this embodiment is that high-purity elemental sulfur is obtained, a large amount of desulfurizing agent is saved, and no exhaust gas is discharged, and the generated waste residue does not contain pollutants, which not only obtains good economic benefits but also reduces environmental pollution.

For the present embodiment, the present invention saves about 75% of operating costs compared to the prior art.

Embodiment 5 of the present invention

The composition, pressure and temperature of the sulfur-containing feed gas in this example were identical to those in Example 1.

As shown in Fig. 9, a total of 6 desulfurization towers A to F constitute a variable temperature desulfurization regeneration device. The desulfurization tower is filled with packing and desulfurizing agent from bottom to top, and operates single tower desulfurization, three tower heating, two tower cooling, and cooling tower. After the circulating gas is cooled, it returns to the sulfur temperature-changing desulfurization regeneration program; and FIG. 10 shows the single-column desulfurization, three-column heating, two-column cooling, and the circulating gas cooling sulfur desulfurization regeneration timing diagram (atmospheric pressure adsorption) after the cooling tower, In Fig. 10, TL represents desulfurization, DJR1 represents regeneration of circulating gas after recovery by sulfur, DJR2 represents heating of circulating gas after recovery by sulfur, and then heating, and GJR represents regeneration of circulating gas after heating. GLQ means high temperature cooling and DLQ means low temperature cooling.

Taking the A tower as an example, referring to FIG. 9 and FIG. 10, the process of the desulfurization tower of the variable temperature desulfurization regeneration device of the present embodiment in a cycle process will be described. At the same time, valves 1A and 2A are opened, and the semi-aqueous gas enters the desulfurization tower A. The desulfurization agent in the desulfurization tower A selectively converts the organic sulfur and the inorganic sulfur in the semi-water gas into elemental sulfur, and the purified gas after the desulfurization enters the next stage. After the desulfurization agent in the desulfurization tower A is desulphurized and saturated, the elemental sulfur in the desulfurization agent undergoes the following regeneration steps:

The first step: simultaneously open the valves 4A and 9A, firstly use the circulating gas of the heating desulfurization tower F to heat the desulfurizing agent entering the desulfurization tower A from the valve 9F, and then open the valves 5A and 9A to recover the sulfur from the sulfur recovery cooler. The circulating gas enters the desulfurizing agent in the desulfurization tower A to be heated, and finally the valves 7A and 8A are opened to be heated by the high-temperature circulating gas having a temperature of 350 ° C from the circulating gas heater to enter the desulfurizing agent in the desulfurization tower A;

The second step: the high-temperature circulating gas enters the desulfurization tower A in the desulfurization agent, and then enters the sulfur recovery cooler through the valve 8A to cool the circulating gas heat exchange after the desulfurization agent in the desulfurization tower F by the 'fifth step', and cools the circulating gas temperature. Below 150 ° C, liquid sulfur is obtained at the same time. When the temperature of the desulfurizing agent in the high-temperature circulating gas heating desulfurization tower A is lower than or equal to the circulating gas temperature after the desulfurizing agent in the fifth step of cooling the desulfurization tower F, the 'fifth step' cools the desulfurizing agent in the desulfurization tower F. The circulating gas does not enter the sulfur recovery cooler, and is heated from the bypass valve into the circulating gas heating gas;

The third step: the circulating gas from the sulfur recovery cooler is heated by the desulfurizing agent in the desulfurization tower C through the valves 5C and 9C, and then heated by the desulfurizing agent entering the desulfurization tower B through the valves 9B and 4B, and finally through the valve 4B. The water cooler is cooled by circulating water, and the circulating gas is cooled to normal temperature;

The fourth step: the normal temperature circulating gas from the water cooler is boosted to 20KPa by the blower, and after opening the valves 3E and 10E into the desulfurization tower E which has been regenerated and initially cooled, the desulfurizing agent in the desulfurization tower E is cooled to Desulfurization temperature 40-50 ° C, while opening the valves 10F and 6F into the desulfurization tower F that has been regenerated, cooling the desulfurization agent in the desulfurization tower F;

The fifth step: cooling the circulating gas after the desulfurizing agent in the desulfurization tower A, first entering the sulfur recovery cooler through the valve 6A to cool the circulating gas after heating the desulfurizing agent, and then entering the circulating gas heater to heat the circulating gas to 350 ° C, and then enter The desulfurizing agent in the desulfurization tower A is heated and regenerated.

Step 6: After the analysis of the elemental sulfur of the desulfurizing agent in the desulfurization tower A is completed, the valves 4A and 9A are closed, and the high-temperature circulating gas having a temperature of 350 ° C is stopped to heat the desulfurizing agent in the desulfurization tower A. Then, the valves 10A and 6A are first opened, and the desulfurizing agent in the desulfurization tower A is cooled by the circulating gas after cooling the desulfurizing agent in the desulfurization tower F through the valve 10F, and then the valves 3A and 10A are opened first, and the normal temperature circulating gas which is discharged from the water cooler is used. Cooling the desulfurizing agent in the desulfurization tower A to a desulfurization temperature of 40-50 ° C,

When the desulfurization agent in the desulfurization tower A is heated to 290 ° C, the desulfurization agent in the desulfurization tower A is stopped, so that the desulfurization agent in the desulfurization tower A is regenerated, and the semi-aqueous gas is again desulfurized to proceed to the next one. Cycle period.

At this point, the desulfurization tower A completes one cycle and can enter the next cycle. The desulfurization towers B to F are the same as the desulfurization tower A, except that they are staggered in time, as shown in Figs. 9 and 10.

The desulfurization tower in the desulfurization state may be one or more, and the specific quantity is determined according to the superficial tower speed, the operating pressure and the treatment gas volume, and the pipeline above the normal temperature is insulated and accompanied by heat.

The result of this embodiment is that high-purity elemental sulfur is obtained, a large amount of desulfurizing agent is saved, and no exhaust gas is discharged, and the generated waste residue does not contain pollutants, which not only obtains good economic benefits but also reduces environmental pollution.

For the present embodiment, the present invention saves about 80% of operating costs compared to the prior art.

In the above five embodiments, when the feed gas pressure is greater than or equal to 20 KPa, after the desulfurization of the desulfurization tower is completed, the gas in the desulfurization tower is first discharged from the bottom and lowered to a normal pressure, and then regenerated from the first step.

Claims (15)

1. A method for regenerating a single sulfur of a desulfurization agent in a desulfurization tower, characterized in that the sulfur-containing feed gas first enters a desulfurization tower equipped with a desulfurization agent, and the purified gas after desulfurization enters the next process, and the desulfurization agent in the desulfurization tower is vulcanized After the substance is converted into elemental sulfur and the desulfurizing agent is desulphurized and saturated, the elemental sulfur in the desulfurizing agent undergoes the following regeneration steps:

   The first step: heating the high-temperature circulating gas from the circulating gas heater into the desulfurizing agent, and heating the temperature of the desulfurizing agent to above the melting point of the elemental sulfur;

   The second step: the high temperature circulating gas heats the desulfurizing agent and then enters the sulfur recovery cooler to be cooled by the external cooling gas, and the circulating gas temperature is cooled to above the melting point of the elemental sulfur, and the liquid sulfur is obtained at the same time;

   The third step: the circulating gas from the sulfur recovery cooler enters the water cooler to exchange heat with the circulating water, and cools the circulating gas to normal temperature;

   The fourth step: the normal temperature circulating gas coming out of the water cooler, after being boosted by the power equipment, enters into the desulfurizing agent that has been regenerated, and cools the desulfurizing agent to the desulfurization temperature;

   The fifth step: cooling the circulating gas after the desulfurizing agent, after entering the circulating gas heater is heated, and then entering another desulfurization tower for desulfurization to be heated and regenerated by the desulfurizing agent;

   Step 6: After the analysis of the elemental sulfur of the desulfurization agent in the desulfurization tower is completed, the high-temperature circulating gas is stopped to heat the desulfurizing agent in the desulfurization tower, and then the normal temperature circulating gas from the water cooler is used to cool the desulfurizing agent in the desulfurization tower to Desulfurization temperature,

   In this way, the desulfurization agent in the desulfurization tower is regenerated, and the sulfur-containing feed gas is again introduced for desulfurization to enter the next cycle.
2. The method for regenerating a single sulfur of a desulfurizing agent in a desulfurization tower according to claim 1, characterized in that after the desulfurizing agent in the 'first step' desulfurization tower is saturated, the circulating gas from the sulfur recovery cooler is first introduced. Heating, and then using a high-temperature circulating gas from the circulating gas heater to enter the desulfurizing agent for heating, heating the temperature of the desulfurizing agent to above the melting point of the elemental sulfur; and the 'third step' of the circulating gas from the sulfur recovery cooler first enters The desulfurization agent that has just completed the desulfurization is heated, and then enters the water cooler to exchange heat with the circulating water, and the circulating gas is cooled to normal temperature.
3. The method for regenerating a single sulfur of a desulfurization agent in a desulfurization tower according to claim 1, characterized in that after the desulfurization agent in the 'first step' desulfurization tower is saturated, the cycle after heating the desulfurization agent in the other desulfurization tower is used first. The gas is heated, and 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 heated into the desulfurizing agent to heat the desulfurizing agent to a temperature above the melting point of the elemental sulfur; The third step 'the circulating gas from the sulfur recovery cooler first enters the desulfurization tower which has completed the first heating, then enters the desulfurization agent which has just completed the desulfurization, and finally enters the water cooler to exchange heat with the circulating water, which will circulate. The gas is cooled to normal temperature.
4. The method for regenerating a single sulfur of a desulfurization agent in a desulfurization tower according to claim 1, characterized in that after the desulfurization agent in the 'first step' desulfurization tower is saturated, the difference between the desulfurization agents in the other desulfurization towers is first used. The temperature circulating gas is heated in series 2 times or more, and 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 heated into the desulfurizing agent to heat the desulfurizing agent. Heating to above the melting point of elemental sulfur; at the same time, the 'third step' of the circulating gas from the sulfur recovery cooler is first heated into a desulfurization tower that has been completed 2 or more times, and then connected in series to 2 or more The desulfurization desulfurizing agent is heated, and finally enters the water cooler to exchange heat with the circulating water, and the circulating gas is cooled to normal temperature.
5. The method for regenerating a single sulfur of a desulfurizing agent in a desulfurization tower according to any one of claims 1 to 4, characterized in that the normal temperature circulating gas from the water cooler in the 'fourth step' is boosted by the power device, and is connected in series to One or more desulfurization agents in the desulfurization towers having different temperatures that have been regenerated, and the desulfurization agent in the first desulfurization tower entering the first desulfurization tower is cooled to the desulfurization temperature.
6. The method for regenerating a single sulfur of a desulfurizing agent in a desulfurization tower according to any one of claims 1-5, characterized in that in the 'second step', the high temperature circulating gas is heated to the desulfurizing agent, and then enters the sulfur recovery cooler and is cooled by the 'fifth step' The circulating gas after the agent is cooled, the temperature of the high-temperature circulating gas heated desulfurizing agent is cooled to above the melting point of the elemental sulfur, and liquid sulfur is obtained at the same time; at the same time, the circulating gas after cooling the desulfurizing agent in the 'fifth step' first enters the sulfur recovery and cooling. The device cools the circulating gas after the high-temperature circulating gas is heated to the desulfurizing agent, and then enters the circulating gas heater to be heated, and then enters another desulphurization desulfurization tower to be heated and regenerated by the desulfurizing agent.
7. A method for regenerating a sulfur-removing agent elemental sulfur in a desulfurization tower according to any of claims 1-6, characterized in that the temperature after the high-temperature circulating gas is heated by the desulfurizing agent in the 'second step' is lower than the 'fifth step' cooling desulfurization When the circulating gas after the agent cools the temperature, the circulating gas after cooling the desulfurizing agent in the 'fifth step' does not enter the sulfur recovery cooler, but is directly heated into the circulating gas heater by bypassing, and then enters another to complete the desulfurization. The desulfurization agent in the desulfurization tower is heated and regenerated.
8. The method for regenerating a single sulfur of a desulfurizing agent in a desulfurization tower according to any one of claims 1 to 7, characterized in that in the first step, the high temperature circulating gas from the circulating gas heater is introduced into the desulfurizing agent for heating, and the temperature of the desulfurizing agent is set. Heat 260 ° C -450 ° C.
9. A method for regenerating elemental sulfur in a desulfurizing agent according to claims 1-8, characterized in that the second step: the circulating gas after heating the desulfurizing agent enters the sulfur recovery cooler to exchange heat with the low temperature gas, and cools the circulating gas temperature. Above 130 ° C, liquid sulfur is obtained at the same time.
10. A method for regenerating a sulfur-removing agent elemental sulfur in a desulfurization tower according to any of claims 1-9, wherein the sulfur-containing feed gas pressure is 0 to 10.0 MPa (gauge pressure).
11. A method for regenerating a sulfur-removing agent elemental sulfur in a desulfurization tower according to any of claims 1 to 10, characterized in that the circulating gas pressure in the heating and cooling desulfurizing agent is 0.001 to 0.2 MPa (gauge pressure).
12. A method for regenerating a sulfur-removing agent elemental sulfur in a desulfurization tower according to any of claims 1-11, characterized in that all pipes are insulated and accompanied by heat.
13. The method for regenerating a single sulfur of a desulfurization agent in a desulfurization tower according to any one of claims 1 to 12, wherein when the pressure of the sulfur-containing feed gas is higher than the normal pressure, the desulfurization agent in the desulfurization tower is saturated, and then the desulfurization tower pressure is first Reduce to normal pressure and then heat regeneration.
14. The method for regenerating a single sulfur of a desulfurizing agent in a desulfurization tower according to any one of claims 1 to 13, characterized in that the desulfurizing agent is various activated carbon, various molecular sieves, silica gel, alumina and various special desulfurizing agents.
15. A method for regenerating a sulfur-removing agent elemental sulfur in a desulfurization tower according to any of claims 1 to 14, characterized in that the oxygen content of the circulating gas in the heating and cooling desulfurizing agent is less than 0.1% (V).

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