阅读说明：本技术 一种提高硫回收能效的方法及装置 (Method and device for improving sulfur recovery efficiency ) 是由 栗进波 胡贤贤 王建斌 任超 刘文林 潘利鹏 郭志鹏 韩世良 于 2019-10-17 设计创作，主要内容包括：本发明一种提高硫回收能效的方法及装置,属于化工生产技术领域；目的是提高硫回收率,解决硫回收工艺中硫回收率低,耗能大的问题；具体包括燃烧炉、换热装置、废热锅炉及硫催化反应装置,燃烧炉与换热装置的热源进口连接,其热源出口与废热锅炉连接,经废热锅炉出口与硫催化反应装置连接,硫催化反应装置反应物排放口与换热装置的冷源进口连接,其冷源出口连接有下一硫催化反应装置以反复对未完全反应的产物进行催化并在此过程换热；通过本装置使硫回收率大大提高,同时降低了整个硫回收反应的能耗,收到了显著的经济效益和社会效益。(The invention relates to a method and a device for improving sulfur recovery efficiency, belonging to the technical field of chemical production; aims to improve the sulfur recovery rate and solve the problems of low sulfur recovery rate and large energy consumption in the sulfur recovery process; the device comprises a combustion furnace, a heat exchange device, a waste heat boiler and a sulfur catalytic reaction device, wherein the combustion furnace is connected with a heat source inlet of the heat exchange device, a heat source outlet of the combustion furnace is connected with the waste heat boiler and is connected with the sulfur catalytic reaction device through an outlet of the waste heat boiler, a reactant discharge port of the sulfur catalytic reaction device is connected with a cold source inlet of the heat exchange device, and a cold source outlet of the sulfur catalytic reaction device is connected with a next sulfur catalytic reaction device so as to repeatedly catalyze incompletely-reacted products and exchange heat in the process; the device greatly improves the sulfur recovery rate, reduces the energy consumption of the whole sulfur recovery reaction, and achieves remarkable economic and social benefits.)

1. The device for improving the sulfur recovery energy efficiency is characterized by comprising a combustion furnace (1), a heat exchange device (2), a waste heat boiler (3) and a sulfur catalytic reaction device, wherein the combustion furnace (1) is connected with a heat source inlet (19) of the heat exchange device (2) through a pipeline, a heat source outlet (4) of the heat exchange device (2) is connected with the waste heat boiler (3), an outlet of the waste heat boiler (3) is connected with a feed inlet of a first sulfur catalytic reaction device (5) through a pipeline, the first sulfur catalytic reaction device (5) is provided with a first sulfur discharge port (6) and a first reactant discharge port (7), the first reactant discharge port (7) is connected with a cold source inlet (8) of the heat exchange device (2) through a pipeline, a cold source outlet (9) of the heat exchange device (2) is connected with a feed inlet of a second sulfur catalytic reaction device (10), the second sulfur catalytic reaction device (10) is provided with a second sulfur discharge port (11) and a second reactant discharge port (12), and the second reactant discharge port (12) is connected with the cold source inlet (8) of the heat exchange device (2).

2. The apparatus for improving energy efficiency of sulfur recovery according to claim 1, wherein said combustion furnace (1) is provided with a mixed acid inlet (13) and an air inlet (14).

3. The apparatus for improving energy efficiency of sulfur recovery according to claim 1, wherein the waste port of the second sulfur catalytic reaction device (10) is opened to a flare gas pipeline.

4. An apparatus for improving energy efficiency of sulfur recovery according to claim 1, wherein said first sulfur discharge port (6) and said second sulfur discharge port (11) are connected to a sulfur recovery tank (15), respectively.

5. The device for improving the energy efficiency of sulfur recovery according to claim 1, characterized in that the outlet (9) of the heat sink of the heat exchange device (2) is further connected with the inlet of a third sulfur catalytic reaction device (16), the third sulfur catalytic reaction device (16) is provided with a third sulfur discharge port (17), and the waste port of the third sulfur catalytic reaction device (16) leads to a flare gas pipeline (18).

6. An arrangement for increasing the energy efficiency of sulfur recovery according to claim 5, characterized in that the third sulfur discharge port (17) is connected to a sulfur recovery tank (15).

7. An arrangement for improving the energy efficiency of sulfur recovery according to claim 1, characterized in that the waste heat boiler (3) is connected with a steam pipe network (18).

8. The method for improving the energy efficiency of sulfur recovery according to claim 1, comprising the steps of:

1) the preheated mixed acid gas and air enter a combustion furnace for reaction;

2) sending the reaction product in the combustion furnace to a heat exchange device, reducing the temperature of the reaction product to 700 ℃ and 900 ℃, and then entering a waste heat boiler;

3) in the waste heat boiler, the reaction product is reduced to 150 ℃ and 300 ℃ again, and the generated steam returns to the heat supply pipe network;

4) the reaction product subjected to secondary heat release enters a first sulfur catalytic reaction device to carry out primary sulfur recovery catalytic reaction, sulfur generated by the sulfur recovery catalytic reaction is discharged to a sulfur recovery tank, and the rest incomplete reactants enter a cold source inlet of a heat exchange device to carry out heat exchange;

5) in the heat exchange device, raising the temperature of the incomplete reactant to about 180-200 ℃, then entering the next-stage sulfur catalytic reaction device for reaction again, and repeatedly circulating until the sulfur is completely recovered.

Technical Field

The invention belongs to the technical field of chemical production, and particularly relates to a method and a device for improving sulfur recovery efficiency.

Background

The claus process is one of the methods used for removing hydrogen sulfide generated during combustion of fossil fuel and geothermal power generation. The principle is to incompletely combust hydrogen sulfide and then react the generated sulfur dioxide with hydrogen sulfide to generate sulfur. If the air and hydrogen sulfide are mixed in a proper ratio, all of the hydrogen sulfide can be changed into sulfur and water. This method is widely used in removing hydrogen sulfide from exhaust gas in geothermal power generation. The sulfur is recovered from the gas containing hydrogen sulfide generated by desulfurization, and the problem of pollution of refinery waste gas to the atmosphere can be solved. The Claus process can be used as a sulfur resource for producing sulfuric acid, and can also be used as a chemical raw material of other departments.

The sulfur recovery core is performed using a traditional claus process, but the traditional claus process has two problems: the method is limited by thermodynamic limitations of long process flows of temperature rise, catalysis and condensation of the Claus process, the sulfur recovery rate of the conventional Claus process can only reach 94-97 percent, and the temperature rise and temperature drop processes in the traditional process have large energy consumption and more heat loss.

Disclosure of Invention

The invention overcomes the defects of the prior art, provides a method and a device for improving sulfur recovery efficiency, and aims to improve sulfur recovery rate and solve the problems of low sulfur recovery rate and high energy consumption in a sulfur recovery process.

In order to achieve the above object, the present invention is achieved by the following technical solutions.

A device for improving the energy efficiency of sulfur recovery comprises a combustion furnace, a heat exchange device, a waste heat boiler and a sulfur catalytic reaction device, the combustion furnace is connected with a heat source inlet of the heat exchange device through a pipeline, a heat source outlet of the heat exchange device is connected with a waste heat boiler, the outlet of the waste heat boiler is connected with the feed inlet of the first sulfur catalytic reaction device through a pipeline, the first sulfur catalytic reaction device is provided with a first sulfur discharge port and a first reactant discharge port, the first reactant discharge port is connected with a cold source inlet of the heat exchange device through a pipeline, the cold source outlet of the heat exchange device is connected with a feed inlet of a second sulfur catalytic reaction device, the second sulfur catalytic reaction device is provided with a second sulfur discharge port and a second reactant discharge port, and the second reactant discharge port is connected with the cold source inlet of the heat exchange device.

Furthermore, the combustion furnace is provided with a mixed acid air inlet and an air inlet.

Further, the waste port of the second sulfur catalytic reaction device leads to a flare gas pipeline.

Furthermore, the first sulfur discharge port and the second sulfur discharge port are respectively connected with the sulfur recovery tank.

Furthermore, a cold source outlet of the heat exchange device is also connected with a feed inlet of a third sulfur catalytic reaction device, the third sulfur catalytic reaction device is provided with a third sulfur discharge port, and a waste port of the third sulfur catalytic reaction device leads to a flare gas pipeline.

Further, the third sulfur discharge port is connected to a sulfur recovery tank.

Furthermore, the waste heat boiler is connected with a steam pipe network.

A method for improving energy efficiency of sulfur recovery, comprising the steps of:

1) and (4) feeding the preheated mixed acid gas and air into a combustion furnace for reaction.

2) And (3) sending the reaction product in the combustion furnace to a heat exchange device, reducing the temperature of the reaction product to 700-900 ℃, and then entering a waste heat boiler.

3) In the waste heat boiler, the reaction product is reduced to 150 ℃ and 300 ℃ again, and the generated steam returns to the heat supply pipe network.

4) And (3) enabling the reaction product subjected to secondary heat release to enter the first sulfur catalytic reaction device for primary sulfur recovery catalytic reaction, discharging sulfur generated by the sulfur recovery catalytic reaction to a sulfur recovery tank, and enabling the rest incomplete reactants to enter a cold source inlet of the heat exchange device for heat exchange.

5) In the heat exchange device, raising the temperature of the incomplete reactant to about 180-200 ℃, then entering the next-stage sulfur catalytic reaction device for reaction again, and repeatedly circulating until the sulfur is completely recovered.

Compared with the prior art, the invention has the beneficial effects that.

The invention combines the sulfur catalytic reaction device, the heat exchange device and the waste heat boiler, makes full use of the temperature of the sulfur reaction product and the heat absorption process of the sulfur catalytic reaction to repeatedly utilize the heat, and simultaneously, the substrate which is not completely reacted in the sulfur catalytic reaction device is continuously and repeatedly heated and catalyzed again in the process, so that the sulfur recovery rate is greatly improved, the energy consumption of the whole sulfur recovery reaction is reduced, and remarkable economic benefit and social benefit are obtained.

Drawings

FIG. 1 is a schematic view showing the construction of an apparatus for improving energy efficiency in sulfur recovery according to the present invention.

Wherein, 1 is for firing burning furnace, 2 is heat transfer device, 3 is waste heat boiler, 4 is the heat source export, 5 is first sulphur catalytic reaction device, 6 is first sulphur discharge port, 7 is first reactant discharge port, 8 is the cold source import, 9 is the cold source export, 10 is second sulphur catalytic reaction device, 11 is the second sulphur discharge port, 12 is the second reactant discharge port, 13 is the mixed acid air inlet, 14 is air inlet, 15 is the sulphur accumulator, 16 is third sulphur catalytic reaction device, 17 is the third sulphur discharge port, 18 is the torch gas pipeline, 19 is the heat source import.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.

As shown in fig. 1, the device for improving the energy efficiency of sulfur recovery comprises a combustion furnace 1, a heat exchange device 2, a waste heat boiler 3 and a three-stage sulfur catalytic reaction device, wherein the sulfur catalytic reaction device comprises a catalytic reaction furnace, a condensation tower, a sulfur recovery tank and other auxiliary devices, sulfur is recovered by adopting a claus process, the heat exchange device 2 is a tubular heat exchanger, and the heat exchange device 2 is provided with a cold source inlet 8, a cold source outlet 9, a heat source inlet 19 and a heat source outlet 4; the combustion furnace 1 is provided with a mixed acid inlet 13 and an air inlet 14. The combustion furnace 1 is connected with a heat source inlet 19 of the heat exchange device 2 through a pipeline, a heat source outlet 4 of the heat exchange device 2 is connected with a waste heat boiler 3, an outlet of the waste heat boiler 3 is connected with a feed inlet of the first sulfur catalytic reaction device 5 through a pipeline, the first sulfur catalytic reaction device 5 is provided with a first sulfur discharge port 6 and a first reactant discharge port 7, the first reactant discharge port 7 is connected with a cold source inlet 8 of the heat exchange device 2 through a pipeline, a cold source outlet 9 of the heat exchange device 2 is connected with a feed inlet of the second sulfur catalytic reaction device 10, the second sulfur catalytic reaction device 10 is provided with a second sulfur discharge port 11 and a second reactant discharge port 12, and the second reactant discharge port 12 is connected with the cold source inlet 8 of the heat exchange device 2. The cold source outlet 9 of the heat exchange device 2 is also connected with a feed inlet of a third sulfur catalytic reaction device 16, the third sulfur catalytic reaction device 16 is provided with a third sulfur discharge port 17, and a waste material port of the third sulfur catalytic reaction device 16 leads to a flare gas pipeline 18. The first sulfur discharge port 6, the second sulfur discharge port 11, and the third sulfur discharge port 17 are connected to the sulfur recovery tank 15, respectively. The waste heat boiler 3 is connected to a steam pipe network 18.

The specific working process is as follows: the preheated mixed acid gas and air respectively reaching about 520 ℃ enter a combustion reaction furnace, and hydrogen sulfide and oxygen react to generate sulfur, hydrogen sulfide, sulfur dioxide and other gases at about 1200 ℃;

the temperature of the related products is reduced to about 800 ℃ through a heat exchange device and then enters a waste heat boiler;

in the waste heat boiler, the heat exchange is fully utilized to reduce the temperature of related products to about 200 ℃ (the temperature is specifically adjusted according to the requirements of the subsequent Claus process), and meanwhile, steam is generated and returns to a heat supply pipe network.

The product reduced to about 200 ℃ enters the first sulfur catalytic reaction device 5, the related mixed product cooled to about 200 ℃ reacts to obtain sulfur in the sulfur recovery tank 15, and meanwhile, the incompletely reacted product cooled to about 120 ℃ is conveyed to the cold source inlet 8 of the heat exchange device 2 through a pipeline for heat exchange.

In the heat exchange device 2, the incompletely reacted product cooled to about 120 ℃ is heated to about 180 ℃, and then enters the second sulfur catalytic reaction device 10 through the cold source outlet 9 for reaction.

In the second sulfur catalytic reaction device 10, the related products react to obtain sulfur in the sulfur recovery tank 15, and meanwhile, the incompletely reacted products cooled to about 120 ℃ are conveyed to the heat exchange device 2 through a pipeline;

in the heat exchanger 2, the incompletely reacted product cooled to about 120 ℃ is heated to about 180 ℃ and then enters the third sulfur catalytic reaction device 16 for reaction.

In the third sulfur catalytic reaction unit 16, the relevant products are reacted to obtain sulfur in the sulfur recovery tank 15, and the remaining impurities are sent to the flare gas for combustion.

The process flow takes three sets of sulfur catalytic reaction systems as an example to explain the transformation of the whole process flow, and according to the actual working conditions, a plurality of sets of response devices can be added to improve the recovery rate of sulfur recovery and reduce the whole energy consumption.

According to the actual operation condition, the sulfur recovery rate is increased by 2 percent, the energy-saving efficiency is improved by 60 percent, and the investment and energy consumption are saved by more than 6000 ten thousand.

While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.