阅读说明：本技术 一种用于纯氧硫磺回收的分级燃烧装置及其回收方法 (Staged combustion device for recovering pure oxygen sulfur and recovery method thereof ) 是由 李铁军 高炬 张伟 于 2021-10-22 设计创作，主要内容包括：本发明公开了一种用于纯氧硫磺回收的分级燃烧装置,涉及硫磺回收技术领域,包括：初级制硫燃烧炉,初级制硫燃烧炉上连接有酸性气输送管路和初级氧气输送管路；初级降温装置,初级降温装置的进气口与初级制硫燃烧炉的出气口相连接；次级制硫燃烧炉,次级制硫燃烧炉的进气口与初级降温装置的出气口通过一级过程气输送管路相连通,一级过程气输送管路上连接有第二酸性气输送管路,次级制硫燃烧炉还连接有次级氧气输送管路；次级降温装置,次级降温装置的进气口与次级制硫燃烧炉的出气口相连接；克劳斯反应装置,克劳斯反应装置进气口与次级降温装置的出气口相连接,克劳斯反应装置出气口连接有尾气输送管路。本发明能够降低反应过程中所放出的热量。(The invention discloses a staged combustion device for recovering pure oxygen sulfur, which relates to the technical field of sulfur recovery and comprises the following components: the primary sulfur production combustion furnace is connected with an acid gas conveying pipeline and a primary oxygen conveying pipeline; the gas inlet of the primary cooling device is connected with the gas outlet of the primary sulfur-making combustion furnace; the secondary sulfur production combustion furnace is connected with the primary cooling device through a primary process gas conveying pipeline, and is also connected with a secondary oxygen conveying pipeline; the air inlet of the secondary cooling device is connected with the air outlet of the secondary sulfur-making combustion furnace; the Claus reaction device is characterized in that an air inlet of the Claus reaction device is connected with an air outlet of the secondary cooling device, and an air outlet of the Claus reaction device is connected with a tail gas conveying pipeline. The invention can reduce the heat released in the reaction process.)

1. A staged combustion device for pure oxygen sulfur recovery, comprising:

the system comprises a primary sulfur production combustion furnace, a first acid gas conveying pipeline and a primary oxygen conveying pipeline, wherein the primary sulfur production combustion furnace is connected with the first acid gas conveying pipeline and the primary oxygen conveying pipeline;

the gas inlet of the primary cooling device is connected with the gas outlet of the primary sulfur-making combustion furnace;

the secondary sulfur production combustion furnace is connected with the primary cooling device through a primary process gas conveying pipeline, and is also connected with a secondary oxygen conveying pipeline;

the gas inlet of the secondary cooling device is connected with the gas outlet of the secondary sulfur-making combustion furnace;

and the gas inlet of the Claus reaction device is connected with the gas outlet of the secondary cooling device, and the gas outlet of the Claus reaction device is connected with a tail gas conveying pipeline.

2. The staged combustion device for pure oxygen sulfur recovery as claimed in claim 1, wherein: the primary cooling device and the secondary cooling device are both waste heat boilers.

3. The staged combustion device for pure oxygen sulfur recovery as claimed in claim 1, wherein: one end of the first acid gas conveying pipeline, which is far away from the primary sulfur production combustion furnace, is connected with an acid gas source, and a first acid gas flow regulating valve is arranged on the first acid gas conveying pipeline.

4. The staged combustion device for pure oxygen sulfur recovery as defined in claim 3, wherein: one end, far away from the primary process gas conveying pipeline, of the second acid gas conveying pipeline is connected with the acid gas source, and a second acid gas flow regulating valve is arranged on the second acid gas conveying pipeline.

5. The staged combustion device for pure oxygen sulfur recovery as claimed in claim 1, wherein: one side of the primary oxygen conveying pipeline, which is far away from the primary sulfur production combustion furnace, is connected with an oxygen source, and the primary oxygen conveying pipeline is provided with a first oxygen flow regulating valve.

6. The staged combustion device for pure oxygen sulfur recovery as claimed in claim 5, wherein: one end of the secondary oxygen conveying pipeline, which is far away from the secondary sulfur production combustion furnace, is connected with the oxygen gas source, and the secondary oxygen conveying pipeline is provided with a second oxygen flow regulating valve.

7. The staged combustion device for pure oxygen sulfur recovery as claimed in claim 1, wherein: the Claus reaction device is a two-stage Claus reaction system or a three-stage Claus reaction system.

8. The staged combustion device for pure oxygen sulfur recovery as claimed in claim 1, wherein: and the tail gas conveying pipeline is provided with a tail gas liquid separating tank.

9. A recovery method of a staged combustion device for pure oxygen sulfur recovery according to any one of claims 1 to 8, comprising the steps of:

s1, enabling the first part of acid gas of the acid gas source and the first part of oxygen of the oxygen gas source to enter the primary sulfur production combustion furnace for combustion, enabling part of the acid gas to react, and enabling the unreacted acid gas to serve as a process gas carrier to balance the temperature in the primary sulfur production combustion furnace;

s2, cooling the process gas from the primary sulfur production combustion furnace through a primary cooling device;

s3, conveying the process gas from the primary cooling device to a secondary sulfur production combustion furnace through a primary process gas conveying pipeline, mixing the process gas with a second part of acid gas on the primary process gas conveying pipeline, and introducing a second part of oxygen of an oxygen gas source into the secondary sulfur production combustion furnace to perform reaction between the acid gas and the oxygen;

s4, cooling the process gas from the secondary sulfur production combustion furnace through a secondary cooling device;

s5, feeding the process gas discharged by the secondary cooling device into a Claus reaction device for reaction;

and S6, discharging the tail gas discharged from the Claus reaction device through a tail gas conveying pipeline.

Technical Field

The invention relates to the technical field of sulfur recovery, in particular to a staged combustion device for recovering pure oxygen sulfur and a recovery method thereof.

Background

The operation load of the sulfur recovery device of domestic refining enterprises is frequently troubled by purchasing the sulfur content of crude oil, and because the enterprise of the change part of the original distribution type is forced to expand the existing sulfur recovery device and transform the sulfur recovery device even to build a new sulfur recovery device, and some enterprises cause the idle state of the capability of the sulfur recovery device. The agenda is inevitable to mention how to obtain the maximum improvement of the treatment capacity of the device on the premise of reducing the construction cost of the device or to perform small-scale reconstruction on the basis of the original device so as to continuously adapt to the frequent sulfur content change in the crude oil.

The oxygen enrichment technology is to use oxygen to partially or completely replace air to be put into the Claus reaction, so that a large amount of inert gas in the air can be prevented from entering a system, the amount of process gas is greatly reduced to 1/2-2/3 in the common design, and the sizes of equipment and pipelines are greatly reduced, so that the construction cost of the device can be greatly reduced, and the possibility of improving the processing capacity of the original device by local transformation is provided.

H in acid waste gas of conventional refining enterprises₂The concentration of S is about 80-85%, combustion products are greatly reduced after air is replaced by pure oxygen in the sulfur production combustion furnace, the temperature of a hearth is increased violently by heat released violently, the temperature of the hearth of the sulfur production combustion furnace is over 2200 ℃, so that the temperature exceeds the limit temperature of a refractory material, and the pure oxygen cannot be utilized on a sulfur recovery device of a conventional refining enterprise.

Therefore, there is a need for a new pure oxygen sulfur recovery method to solve the above problems.

Disclosure of Invention

The invention aims to provide a staged combustion device for recovering pure oxygen sulfur and a recovery method thereof, which are used for solving the technical problems in the prior art, and the temperature of a hearth of a sulfur production combustion furnace can be reduced through staged combustion, so that the application of oxygen enrichment and even pure oxygen in a sulfur recovery device is realized.

In order to achieve the purpose, the invention provides the following scheme:

the invention discloses a staged combustion device for recovering pure oxygen sulfur, which comprises:

the system comprises a primary sulfur production combustion furnace, a first acid gas conveying pipeline and a primary oxygen conveying pipeline, wherein the primary sulfur production combustion furnace is connected with the first acid gas conveying pipeline and the primary oxygen conveying pipeline;

the gas inlet of the primary cooling device is connected with the gas outlet of the primary sulfur-making combustion furnace;

the secondary sulfur production combustion furnace is connected with the primary cooling device through a primary process gas conveying pipeline, and is also connected with a secondary oxygen conveying pipeline;

the gas inlet of the secondary cooling device is connected with the gas outlet of the secondary sulfur-making combustion furnace;

and the gas inlet of the Claus reaction device is connected with the gas outlet of the secondary cooling device, and the gas outlet of the Claus reaction device is connected with a tail gas conveying pipeline.

Preferably, the primary cooling device and the secondary cooling device are both waste heat boilers.

Preferably, one end of the first acid gas conveying pipeline, which is far away from the primary sulfur production combustion furnace, is connected with an acid gas source, and a first acid gas flow regulating valve is arranged on the first acid gas conveying pipeline.

Preferably, one end of the second acid gas conveying pipeline, which is far away from the primary process gas conveying pipeline, is connected with the acid gas source, and a second acid gas flow regulating valve is arranged on the second acid gas conveying pipeline.

Preferably, an oxygen source is connected to one side of the primary oxygen conveying pipeline, which is far away from the primary sulfur production combustion furnace, and the primary oxygen conveying pipeline is provided with a first oxygen flow regulating valve.

Preferably, one end of the secondary oxygen conveying pipeline, which is far away from the secondary sulfur production combustion furnace, is connected with the oxygen gas source, and the secondary oxygen conveying pipeline is provided with a second oxygen flow regulating valve.

Preferably, the claus reaction unit is a two-stage claus reaction system or a three-stage claus reaction system.

Preferably, the tail gas conveying pipeline is communicated with the secondary oxygen conveying pipeline through a circulating pipeline.

Preferably, the tail gas conveying pipeline is provided with a tail gas liquid separating tank.

The invention also discloses a recovery method of the staged combustion device for recovering pure oxygen sulfur, which comprises the following steps:

s1, enabling the first part of acid gas of the acid gas source and the first part of oxygen of the oxygen gas source to enter the primary sulfur production combustion furnace for combustion, enabling part of the acid gas to react, and enabling the unreacted acid gas to serve as a process gas carrier to balance the temperature in the primary sulfur production combustion furnace;

s2, cooling the process gas from the primary sulfur production combustion furnace through a primary cooling device;

s3, conveying the process gas from the primary cooling device to a secondary sulfur production combustion furnace through a primary process gas conveying pipeline, mixing the process gas with a second part of acid gas on the primary process gas conveying pipeline, and introducing a second part of oxygen of an oxygen gas source into the secondary sulfur production combustion furnace to perform reaction between the acid gas and the oxygen;

s4, cooling the process gas from the secondary sulfur production combustion furnace through a secondary cooling device;

s5, feeding the process gas discharged by the secondary cooling device into a Claus reaction device for reaction;

and S6, discharging the tail gas discharged from the Claus reaction device through a tail gas conveying pipeline.

Compared with the prior art, the invention has the following technical effects:

the invention can realize the temperature-controlled combustion of the acid gas by the graded supplement of the acid gas and the oxygen, and avoid the overhigh temperature of the sulfur-making combustion furnace. When the process gas enters the secondary sulfur-making combustion furnace, the second part of the acid gas can be supplemented again to improve the concentration of the process gas so as to be used as the raw material gas of the secondary sulfur-making combustion furnace. In addition, the device can reduce the investment cost of the device by 40 percent and improve the processing capacity of the device by 220 percent when being used for newly building a sulfur recovery device.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a staged combustion device for pure oxygen sulfur recovery according to an embodiment of the present invention;

in the figure: 1-primary sulfur production combustion furnace; 11-a first acid gas delivery line; 12-primary oxygen delivery line; 2-a primary cooling device; 3-a secondary sulfur production combustion furnace; 31-primary process gas delivery line; 32-secondary oxygen delivery line; 33-a second acid gas delivery line; 4-a secondary cooling device; 5-a Claus reaction unit; 51-a secondary process gas delivery line; 52-tail gas transfer line.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a staged combustion device for recovering pure oxygen sulfur and a recovery method thereof, which are used for solving the technical problems in the prior art, and the temperature of a hearth of a sulfur production combustion furnace can be reduced through staged combustion, so that the application of oxygen enrichment and even pure oxygen in a sulfur recovery device is realized.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1, the present embodiment provides a staged combustion apparatus for pure oxygen sulfur recovery, comprising:

the primary sulfur production furnace 1 is an existing sulfur production furnace, in whichReaction is 2H₂S+O₂＝S₂+2H₂O, a first acid gas conveying pipeline 11 and a primary oxygen conveying pipeline 12 are connected to the primary sulfur production combustion furnace 1 and are respectively connected with an acid gas source and an oxygen gas source;

the primary cooling device 2 can be an existing cooling device, and an air inlet of the primary cooling device 2 is connected with an air outlet of the primary sulfur production combustion furnace 1;

the secondary sulfur production combustion furnace 3, the secondary sulfur production combustion furnace 3 and the primary sulfur production combustion furnace 1 have the same structure, the air inlet of the secondary sulfur production combustion furnace 3 is communicated with the air outlet of the primary cooling device 2 through a primary process gas conveying pipeline 31, the primary process gas conveying pipeline 31 is connected with a second acid gas conveying pipeline 33, and the secondary sulfur production combustion furnace 3 is also connected with a secondary oxygen conveying pipeline 32;

the structure of the secondary cooling device 4 is the same as that of the primary cooling device 2, and the air inlet of the secondary cooling device 4 is connected with the air outlet of the secondary sulfur-making combustion furnace 3;

the Claus reaction device 5, the air inlet of the Claus reaction device 5 is connected with the air outlet of the secondary cooling device 4 through a secondary process gas conveying pipeline 51, and the air outlet of the Claus reaction device 5 is connected with a tail gas conveying pipeline 52.

When in use, part of the whole acid gas and part of the oxygen gas are firstly introduced into the primary sulfur-making combustion furnace 1, so as to react with the acid gas and the oxygen gas. Wherein only part of the acid gas is burnt, and part of the acid gas is used as a process gas carrier due to insufficient oxygen, thereby playing a role in balancing the temperature of the primary sulfur-making combustion furnace 1. Then the process gas flowing out of the primary sulfur production combustion furnace 1 is introduced into the primary cooling device 2 for cooling, and then is introduced into the primary process gas conveying pipeline 31. The gas in the primary process gas conveying pipeline 31 is introduced into the secondary sulfur production combustion furnace 3, and the residual acid gas is introduced into the primary process gas conveying pipeline 31 before introduction, so that the concentration of the acid gas in the process gas is enhanced and used as raw material gas. At the same time, the excess oxygen is introduced into the secondary sulfur production burner 3, and the secondary reaction is carried out in the secondary sulfur production burner 3. The process gas from the secondary sulfur production combustion furnace 3 enters the secondary cooling device 4 for cooling again, then is introduced into the Claus reaction device 5, is subjected to Claus reaction, and is discharged from the tail gas conveying pipeline 52 and collected.

In this embodiment, the primary cooling device 2 and the secondary cooling device 4 are both waste heat boilers, which are conventional cooling devices, and can absorb heat emitted from the primary sulfur-making combustion furnace 1 and the secondary sulfur-making combustion furnace 3, and release the rest of the heat to a place where the heat is needed, thereby achieving the purpose of waste heat utilization.

In this embodiment, one end of the first acid gas conveying pipeline 11, which is far away from the primary sulfur production combustion furnace 1, is connected to an acid gas source, and the first acid gas conveying pipeline 11 is provided with a first acid gas flow regulating valve, so that the amount of the acid gas introduced into the primary sulfur production combustion furnace 1 can be controlled by the first acid gas flow regulating valve, specifically about 60% of the total acid gas.

In this embodiment, one end of the second acid gas conveying pipeline 33, which is far away from the primary process gas conveying pipeline 31, is connected to an acid gas source, and the second acid gas conveying pipeline 33 is provided with a second acid gas flow regulating valve, so that the amount of the acid gas introduced into the primary process gas conveying pipeline 31 can be controlled by the second acid gas flow regulating valve, specifically, 40% of the total acid gas.

In this embodiment, the primary oxygen delivery pipe 12 is connected to an oxygen source at a side away from the primary sulfur production combustion furnace 1, and the primary oxygen delivery pipe 12 is provided with a first oxygen flow regulating valve. The amount of oxygen introduced into the primary sulfur production furnace 1 can be controlled by the first oxygen flow regulating valve.

In this embodiment, the end of the secondary oxygen conveying pipeline 32 far away from the secondary sulfur production combustion furnace 3 is connected with an oxygen gas source, and the secondary oxygen conveying pipeline 32 is provided with a second oxygen flow regulating valve. The amount of oxygen introduced into the secondary sulfur production combustion furnace 3 can be controlled by the second oxygen flow regulating valve.

In this embodiment, the Claus reaction apparatus 5 is a two-stage Claus reaction system or a three-stage Claus reaction, both of which are prior artThis example is illustrated by a two-stage Claus reaction system. The two-stage claus reaction system comprises three sulfur condensers, two heaters and two converters. For the specific workflow in the secondary claus reaction system: firstly, the gas enters a primary sulfur condenser to be further cooled to 160 ℃, the primary sulfur condenser generates low-pressure saturated steam of 0.4MPa (G) to recover waste heat, the element sulfur generated by the reaction is condensed into liquid, the liquid sulfur is collected and separated and then enters a sulfur sealing tank, the process gas from the primary sulfur condenser enters a primary heater to be heated to 240 ℃ according to the requirement of the reaction temperature and then enters a primary converter, and H in the process gas is reacted with a catalyst₂S and SO₂Performing Claus reaction to convert into elemental sulfur; high-temperature process gas (about 358.6 ℃) discharged from the primary converter enters a secondary sulfur condenser, the process gas is cooled to 160 ℃ by the secondary sulfur condenser, the secondary sulfur condenser generates low-pressure saturated steam with 0.4MPa (G) to recover waste heat, element sulfur generated by the reaction is condensed into liquid, the liquid sulfur is collected and separated and then enters a sulfur sealing tank, the process gas discharged from the secondary sulfur condenser enters a secondary heater, the temperature is increased to 220 ℃ and then enters the secondary converter, and residual H in the process gas is enabled to enter a secondary converter₂S and SO₂Further carrying out catalytic conversion, and enabling high-temperature process gas (about 256.4 ℃) discharged from the secondary converter to enter a tertiary sulfur condenser; cooling the process gas to 160 ℃ through a three-stage sulfur condenser, generating low-pressure saturated steam of 0.4MPa (G) in the three-stage sulfur condenser to recover waste heat, condensing the element sulfur generated by the reaction into liquid, collecting and separating the liquid sulfur, and then entering a sulfur seal tank.

In this embodiment, the tail gas conveying pipeline 52 is provided with a tail gas liquid separation tank, and the sulfur production tail gas from the tertiary sulfur condenser in the claus reaction device 5 enters the tail gas liquid separation tank. The tail gas divides the fluid reservoir to catch a small amount of liquid sulphur that carries, sends to the liquid sulphur pond through sulphur seal jar, and the process gas that the tail gas divides the fluid reservoir top to come out gets into tail gas processing apparatus, discharges again after reaching gas emission standard through tail gas processing apparatus.

The embodiment also provides a recovery method of the staged combustion device for recovering pure oxygen sulfur, which comprises the following steps:

s1, first part of acid gas source and oxygen gas sourceThe first part of oxygen enters the primary sulfur production combustion furnace 1 for combustion, wherein the first part of acid gas is 60 percent of the total acid gas, the ideal ratio of the flow rate of the oxygen to the flow rate of the acid gas is about 0.2-0.25, and the increase or decrease of the supply amount of the oxygen can increase or decrease the H in the acid gas₂The reaction amount of S, thereby changing the temperature of the primary sulfur production combustion furnace 1. The temperature of the primary sulfur production combustion furnace 1 is a key parameter for controlling the oxygen supply amount of the primary sulfur production combustion furnace 1, and the temperature of the sulfur production combustion furnace should be kept within 1300-1350 ℃. After combustion, all organic matters such as hydrocarbons in the acid gas are decomposed, and the main reactions are as follows: 2H₂S+O₂＝S₂+2H₂And O. Only part of the acid gas reacts in the primary sulfur production combustion furnace 1, specifically 58-65% (v) of H₂S, reacting, namely taking unreacted acid gas as a process gas carrier to balance the temperature in the primary sulfur production combustion furnace 1;

s2, cooling the process gas from the primary sulfur production combustion furnace 1 through the primary cooling device 2, and cooling the process gas to 320 ℃;

s3, the process gas from the primary cooling device 2 is delivered to the secondary sulfur production combustion furnace 3 through the primary process gas delivery line 31, the process gas is mixed with the second part (namely the residual 40%) of the acid gas on the primary process gas delivery line 31, the second part of the oxygen gas source is introduced into the secondary sulfur production combustion furnace 3 to react with the acid gas, and meanwhile, the oxygen amount of the secondary sulfur production combustion furnace 3 is H₂S/SO₂The feedback data of the on-line analyzer is strictly controlled to ensure that the oxygen quantity of the secondary sulfur production combustion furnace 3 reaches H₂Complete conversion of S to S₂The equivalent ratio of (a);

s4, cooling the process gas from the secondary sulfur production combustion furnace 3 through a secondary cooling device 4, and cooling the process gas to 320 ℃;

s5, the process gas discharged from the secondary cooling device 4 enters a Claus reaction device 5 to carry out the reaction process of the three-stage Claus reactor;

s6, the tail gas discharged from the claus reaction unit is discharged through the tail gas transfer line 52.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.