CN111470477B - Sulfur recovery Claus furnace oxygen-enriched air blast management system and method - Google Patents
Sulfur recovery Claus furnace oxygen-enriched air blast management system and method Download PDFInfo
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- CN111470477B CN111470477B CN202010263549.5A CN202010263549A CN111470477B CN 111470477 B CN111470477 B CN 111470477B CN 202010263549 A CN202010263549 A CN 202010263549A CN 111470477 B CN111470477 B CN 111470477B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
- C01B17/0404—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process
- C01B17/0452—Process control; Start-up or cooling-down procedures of the Claus process
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/007—Regulating air supply or draught using mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/26—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention relates to the technical field of petrochemical industry and coal chemical industry, and provides a sulfur recovery Claus furnace oxygen-enriched air blast management system and a method. The oxygen interface safety device before the compressor can mix oxygen and air before the compressor, can be completed by using low-pressure oxygen, does not need to use an oxygen supercharger, is uniform, safe and reliable in mixing and low in cost, can strictly monitor and manage the concentration, flow, temperature, pressure, electrostatic discharge and particle filtration of the oxygen, and achieves optimization through calculation of the oxygen enrichment uniform mixing monitoring module.
Description
Technical Field
The invention relates to the technical field of petrochemical industry and coal chemical industry, in particular to a sulfur recovery Claus furnace oxygen-enriched air blast management system and method.
Background
Because the petrochemical industry in China refines high-sulfur crude oil with high sulfur content and low price, and the natural gas produced in China also has high sulfur content, a large amount of hydrogen sulfide can be generated in the chemical reaction process in the field of coal chemical industry. In order to protect the equipment, the aim of protecting the equipment is often achieved by spraying an amine solution in the production process, so that the hydrogen sulfide also contains an amine component. At present, many natural gas and oil refining petrochemical plants urgently require the improvement of the processing capacity of hydrogen sulfide.
Claus furnaces are devices used to remove hydrogen sulfide produced by the combustion of fossil fuels. The principle is to incompletely combust hydrogen sulfide and then react the generated sulfur dioxide with hydrogen sulfide to generate sulfur. At present, because light low-sulfur crude oil is increasingly scarce and expensive, people are turning to crude oil with heavier components and higher acidity, environmental regulations also increasingly strict on the sulfur content in fuel, new oil specifications (such as ultra-low sulfur diesel) require fuel products with lower sulfur content, and environmental protection departments implement more strict regulations on the sulfur emission of oil, natural gas and chemical plants. The net result of all this is the need to increase the capacity of the plant to treat hydrogen sulfide while achieving higher sulfur recovery.
Oxygen enrichment modification of the claus furnace can greatly improve the processing capacity of the claus furnace, wherein oxygen enrichment processes of the claus furnace are divided into three categories: 1) low concentration oxygen rich (O)2Less than or equal to 28 percent), 2) medium-concentration oxygen enrichment (less than or equal to 28 percent of O)2Less than or equal to 40 percent), 3) high-concentration oxygen enrichment (less than or equal to 40 percent and O)2Less than or equal to 80 percent). The low-concentration oxygen enrichment is directly combusted without any improvement on the Claus furnace, and the medium-concentration and high-concentration oxygen enrichment combustion needs technical improvement on refractory materials and nozzles of the Claus furnace, and needs a large investment and also needs to bear operation risks. By utilizing the low-concentration oxygen enrichment technology, the treatment capacity of the Claus reaction furnace is improved by 22 percent in the same ratio during the actual operation of the Claus furnace for recovering sulfur in 8 ten thousand tons/year, so the conclusion can be drawn: the low-concentration oxygen enrichment technology which is less than or equal to 28 percent is safe, reliable and most economic.
However, the low-concentration oxygen enrichment process of the existing claus furnace adopts high-pressure oxygen mixing after a compressor, the pressure of the oxygen is required to be more than 1.6MPa, an oxygen booster is needed, the high-pressure oxygen has high requirement on the material of pipeline equipment, the operation cost of the pipeline equipment is greatly increased, the high-pressure oxygen has great danger on safety, and the mixing uniformity is also influenced.
Disclosure of Invention
In view of the above, the present invention provides a system and a method for managing oxygen-rich air blowing of a sulfur recovery claus furnace. The system provided by the invention can mix oxygen with air in front of the compressor, can be completed by using low-pressure oxygen, is uniform, safe and reliable in mixing, does not need an oxygen booster, and is low in cost.
In order to achieve the above object, the present invention provides the following technical solutions:
a sulfur recovery Claus furnace oxygen enrichment blast management system comprises a compressor front oxygen interface safety device, a compressor and a compressor rear oxygen enrichment monitoring system;
the front oxygen interface safety device of the compressor comprises an oxygen-enriched uniform mixing monitoring module, an oxygen introducing pipeline, an air introducing pipeline, a nitrogen introducing pipeline and a static mixer, wherein the oxygen introducing pipeline comprises a first manual stop valve, a first flame arrester, an oxygen flow transmitter, a first filter, a first oxygen-enriched emergency stop valve, a second flame arrester, an oxygen-enriched flow regulating valve, a second oxygen-enriched emergency stop valve, a third flame arrester and a second manual stop valve which are sequentially connected in series;
an emptying pipeline is arranged in front of the second oxygen-enriched emergency cut-off valve, and a high-point emptying valve is arranged on the emptying pipeline; a pipeline between the first oxygen-enriched emergency cut-off valve and the second flame arrester is communicated with an emptying pipeline;
the nitrogen introducing pipeline is sequentially provided with a second filter and a nitrogen purging seal valve in series, and the obtained nitrogen introducing pipeline is communicated with a pipeline between the first oxygen-enriched emergency cut-off valve and the second flame arrester and is also communicated with a pipeline between the oxygen-enriched flow regulating valve and the second oxygen-enriched emergency cut-off valve;
the air inlet pipeline and the oxygen inlet pipeline are both communicated with the inlet of the static mixer; the outlet of the static mixer is communicated with the inlet of a compressor, and the outlet of the compressor is communicated with the oxygen-enriched air inlet of the Claus furnace; the compressor is controlled by a compressor monitoring system; the compressor inlet pipeline is provided with a compressor inlet online oxygen analyzer, and the compressor outlet pipeline is provided with a compressor outlet online oxygen analyzer;
a first pressure transmitter and a first temperature transmitter are arranged in front of the first filter, a second pressure transmitter is arranged behind the first filter, a third pressure transmitter and a fourth pressure transmitter are respectively arranged in front of and behind the oxygen-enriched flow regulating valve, and a fifth pressure transmitter and a sixth pressure transmitter are respectively arranged in front of and behind the third flame arrester;
a seventh pressure transmitter and a second temperature transmitter are arranged on the air inlet pipeline;
the oxygen flow transmitter, the first to seventh pressure transmitters, the first to second temperature transmitters, the compressor inlet online oxygen analyzer, the compressor outlet online oxygen analyzer and the compressor monitoring system transmit signals to the oxygen-enriched uniform mixing monitoring module, and the oxygen-enriched uniform mixing monitoring module controls the opening degrees of the first oxygen-enriched emergency cut-off valve, the oxygen-enriched flow regulating valve, the second oxygen-enriched emergency cut-off valve, the high-point vent valve and the nitrogen purging seal valve according to the signal values and controls the emergency shutdown and safety interlocking of the oxygen interface safety device in front of the compressor;
the outlet of the compressor is communicated with the oxygen-enriched air inlet of the Claus furnace through a main air pipeline and a breeze pipeline, and the main air pipeline and the breeze pipeline are connected in parallel; the main air pipeline is provided with a main air flow regulating valve, and the micro air pipeline is provided with a micro air flow regulating valve; the Claus furnace is also provided with a hydrogen sulfide inlet pipeline and a fuel gas inlet pipeline, tail gas generated by the Claus furnace is discharged through a trap, and the trap is provided with a tail gas discharge pipeline;
the post-compressor oxygen-enriched monitoring system comprises a post-compressor oxygen-enriched monitoring module and a monitoring instrument; the monitoring instrument comprises a third temperature transmitter and an eighth pressure transmitter which are arranged at the outlet of the compressor, a main air flow transmitter arranged on the main air pipeline, and a breeze flow transmitter arranged on the breeze pipeline; a hydrogen sulfide flow transmitter arranged on the hydrogen sulfide inlet pipeline; a fourth temperature transmitter arranged on the Claus furnace body; the tail gas on-line analyzer is arranged on the tail gas discharge pipeline;
the third temperature transmitter, the eighth pressure transmitter, the main air flow transmitter, the breeze flow transmitter, the hydrogen sulfide flow transmitter, the fourth temperature transmitter, the tail gas online analyzer, the compressor inlet online oxygen analyzer and the compressor outlet online oxygen analyzer transmit signals to the compressor rear oxygen enrichment monitoring module; and the rear compressor oxygen enrichment monitoring module adjusts the opening degrees of the main air flow regulating valve and the breeze flow regulating valve and the temperature of a hearth of the Claus furnace according to the signal values and controls emergency stop and safety interlock of the Claus furnace.
Preferably, a first pressure gauge, a second pressure gauge, a third pressure gauge, a fourth pressure gauge, a fifth pressure gauge, a sixth pressure gauge and a seventh pressure gauge are sequentially arranged on pipelines between the manual stop valve and the first flame arrester, between the oxygen flow transmitter and the first filter, between the first filter and the first oxygen-enriched emergency stop valve, between the first oxygen-enriched emergency stop valve and the second flame arrester, between the second flame arrester and the second oxygen-enriched flow stop valve, between the second oxygen-enriched emergency stop valve and the third flame arrester, and between the third flame arrester and the second manual stop valve; and a thermometer is also arranged on the pipeline between the manual stop valve and the first flame arrester.
Preferably, the material of the pipeline in the front oxygen interface safety device of the compressor and the material of the compressor are independently austenitic stainless steel or carbon steel.
Preferably, the front oxygen interface safety device of the compressor is mounted in a skid-mounted mode in front of the compressor.
The invention also provides an oxygen-enriched air blast management method for recycling Claus sulfur by using the system in the scheme, which comprises the following steps:
respectively introducing oxygen and air from an oxygen introducing pipeline and an air introducing pipeline of an oxygen-enriched air blast management system of the sulfur recovery Claus furnace, and mixing the oxygen and the air in a static mixer under the control of an oxygen-enriched uniform mixing monitoring module to obtain oxygen-enriched air;
the oxygen-enriched air is compressed by a compressor and then enters a Claus furnace through a main air pipeline and a breeze pipeline, and hydrogen sulfide and fuel gas are introduced into the Claus furnace and react under the control of an oxygen-enriched monitoring system behind the compressor;
wherein the pressure of the oxygen at the inlet of the oxygen introducing pipeline is less than or equal to 15 KPa; the oxygen content of the oxygen-enriched air is more than 21% and less than or equal to 28%.
Preferably, the oxygen enters the static mixer through a first manual stop valve, a first flame arrester, an oxygen flow transmitter, a first filter, a first oxygen-enriched emergency cut-off valve, a second flame arrester, an oxygen-enriched flow regulating valve, a second oxygen-enriched emergency cut-off valve, a third flame arrester and a second manual stop valve in sequence.
Preferably, the degree of mixing of oxygen and air in the static mixer is 95% or more.
Preferably, the pressure of the oxygen-enriched air at the outlet of the compressor is 0.28-0.32 MPa.
Preferably, the residence time of the reaction in the Claus furnace is 1.3-1.4 s.
Preferably, the temperature in the Claus reaction furnace is 1480-1520 ℃.
Has the advantages that:
(1) the system provided by the invention comprises a front-compressor oxygen interface safety device, a compressor and a rear-compressor oxygen enrichment monitoring system, wherein the front-compressor oxygen interface safety device can mix oxygen and air before the compressor, low-pressure oxygen can be used, an oxygen booster is not needed, the mixing is uniform, safe and reliable, and the cost is low;
(2) in the system provided by the invention, the front oxygen interface safety device of the compressor can strictly monitor and manage the concentration, flow, temperature, pressure, electrostatic discharge and particle filtration of oxygen, and the oxygen-enriched air obtained in the static mixer is ensured to have optimal pressure and oxygen content through the calculation of the oxygen-enriched uniform mixing monitoring module;
(3) the system provided by the invention monitors the whole oxygen enrichment process through the front oxygen enrichment homogeneous mixing interface safety device of the compressor and the rear oxygen enrichment monitoring system of the compressor, and can ensure the safe operation and the service life of the Claus reaction furnace;
(4) the invention also provides an oxygen-enriched air blast management method for recycling Claus sulfur by using the system in the scheme, the method provided by the invention can ensure that low-pressure oxygen is fully mixed with air at the inlet of the compressor (in a negative pressure state), and the oxygen-enriched air is subjected to pressure increase by air blast of the compressor and then enters the Claus furnace to participate in the Claus reaction, so that the hydrogen sulfide treatment capacity and the sulfur recovery rate of the Claus furnace can be effectively improved;
(5) in the art, the throughput of the claus furnace is designed to have a fixed throughput range, and the hydrogen sulfide throughput of the plant is sometimes changed, and once the throughput exceeds the throughput of one line, another line must be started and the other line is not matched with the increased amount, so that it often happens that the cart is used as a cart, causing unnecessary waste. The method provided by the invention can meet the requirements only by flexibly adjusting the oxygen content in the oxygen-enriched air according to the treatment capacity of the hydrogen sulfide, is more convenient and does not cause waste.
(6) The method provided by the invention can fully mix hydrogen sulfide and oxygen, and oxygen-enriched combustion enables the thermal oxidation reaction in the Claus reaction furnace to be more violent than the conventional oxidation reaction, so that the decomposition requirement of BTX pollutants can be met, and the Tail Gas Treatment (TGTU) can reach the environmental protection requirement.
Drawings
FIG. 1 is a schematic view of a front oxygen interface safety device for a compressor;
FIG. 2 is a schematic diagram of a post compressor oxygen enrichment monitoring system;
the meanings of the reference symbols in FIGS. 1 to 2 are shown in Table 1:
TABLE 1 meanings of reference numerals in FIGS. 1 to 2
Detailed Description
The invention provides an oxygen-enriched blast management system of a sulfur recovery Claus furnace, which comprises a front oxygen interface safety device of a compressor, the compressor and a rear oxygen-enriched monitoring system of the compressor.
In the present invention, the schematic structural diagram of the front oxygen interface safety device of the compressor is shown in fig. 1: UC-10001A-oxygen-enriched monitoring module, D-101-first manual stop valve, Z-101-first flame arrester, FT-101-oxygen flow transmitter, FI-001-oxygen flow control loop, G-101-first filter, HSV-101-first oxygen-enriched emergency cut-off valve, HS-101-first oxygen-enriched emergency cut-off valve control loop, Z-102-second flame arrester, FV-102-oxygen-enriched flow regulating valve, FC-001-oxygen-enriched flow regulating valve control loop, HSV-102-second oxygen-enriched emergency cut-off valve, HS-102-first oxygen-enriched emergency cut-off valve control loop, Z-103-third flame arrester, D-102-second manual stop valve, SBV-001-static mixer, G-201-second filter, XSV-201-nitrogen purging sealing valve, XS-201-nitrogen purge sealing valve control loop, C-001-compressor, XSV-101-high-point blow-down valve, HS-103-high-point blow-down valve control loop, PI-001-first pressure transmitter, PI-002-second pressure transmitter, PI-003-third pressure transmitter, PI-004-fourth pressure transmitter, PI-005-fifth pressure transmitter, PI-006-sixth pressure transmitter, PI-007-seventh pressure transmitter, TI-001-first temperature transmitter; TI-002-a second temperature transmitter, PG 101-a first pressure gauge, PG 102-a second pressure gauge, PG 103-a third pressure gauge, PG 104-a fourth pressure gauge, PG 105-a fifth pressure gauge, PG 106-a sixth pressure gauge, PG 107-a seventh pressure gauge, and TG 101-a temperature gauge; ITCC-compressor monitoring system, ARS-101-compressor inlet on-line oxygen analyzer, ARS-102-compressor outlet on-line oxygen analyzer.
In the invention, the front oxygen interface safety device of the compressor comprises an oxygen-enriched uniform mixing monitoring module, an oxygen introducing pipeline, an air introducing pipeline, a nitrogen introducing pipeline and a static mixer.
In the invention, the oxygen introducing pipeline comprises a first manual stop valve, a first flame arrester, an oxygen flow transmitter, a first filter, a first oxygen-enriched emergency cut-off valve, a second flame arrester, an oxygen-enriched flow regulating valve, a second oxygen-enriched emergency cut-off valve, a third flame arrester and a second manual stop valve which are sequentially connected in series; the first oxygen-enriched emergency cut-off valve and the second oxygen-enriched emergency cut-off valve are preferably manual control valves with interlocking functions; the high-point emptying valve is preferably a control valve with an interlocking function; in the invention, a first pressure transmitter and a first temperature transmitter are arranged in front of the first filter, the first temperature transmitter is used for monitoring the temperature of oxygen entering the interface safety device, and the first pressure transmitter is used for monitoring the pressure in front of the filter; a second pressure transmitter is arranged behind the first filter and used for monitoring the pressure behind the filter; the front and the back of the oxygen-enriched flow regulating valve are respectively provided with a third pressure transmitter and a fourth pressure transmitter which are respectively used for monitoring the pressure of the front and the back of the oxygen-enriched flow regulating valve; a fifth pressure transmitter and a sixth pressure transmitter are respectively arranged at the front and the back of the third flame arrester and are respectively used for monitoring the pressure at the front and the back of the third flame arrester; and a seventh pressure transmitter is arranged on the air inlet pipeline and used for monitoring the air pressure at the inlet of the air inlet pipeline.
In the invention, the oxygen flow transmitter is preferably controlled by an oxygen flow loop, and transmits a signal to the oxygen-enriched uniform mixing monitoring module through the oxygen flow control loop; the first oxygen-enriched emergency cut-off valve is preferably controlled by a first oxygen-enriched emergency cut-off valve control loop, and the oxygen-enriched uniform mixing monitoring module transmits signals to the first oxygen-enriched emergency cut-off valve through the first oxygen-enriched emergency cut-off valve control loop to control the interlocking of the first oxygen-enriched emergency cut-off valve; the second oxygen-enriched emergency cut-off valve is preferably controlled by a second oxygen-enriched emergency cut-off valve control loop, and the control mode is consistent with that of the first oxygen-enriched emergency cut-off valve; the oxygen-enriched flow regulating valve is preferably controlled by a flow control loop, the oxygen-enriched uniform mixing monitoring module transmits a signal to the flow control loop, and the flow control loop controls the opening of the oxygen-enriched flow regulating valve according to a signal value; the high-point emptying valve is preferably controlled by a high-point emptying valve control loop, the oxygen-enriched uniform mixing monitoring module transmits a signal to the high-point emptying valve control loop, and the high-point emptying valve control loop controls the opening and the closing of the high-point emptying valve according to the signal value; the nitrogen purging sealing valve is preferably controlled by a nitrogen purging sealing valve control loop, the oxygen-enriched uniform mixing monitoring module transmits a signal to the nitrogen purging sealing valve control loop, and the nitrogen purging sealing valve control loop controls the opening and closing of the nitrogen purging sealing valve according to the signal value.
In the invention, a first pressure gauge, a second pressure gauge, a third pressure gauge, a fourth pressure gauge, a fifth pressure gauge, a sixth pressure gauge and a seventh pressure gauge are sequentially arranged on pipelines between the manual stop valve and the first flame arrester, between the oxygen flow transmitter and the first filter, between the first filter and the first oxygen-enriched emergency stop valve, between the first oxygen-enriched emergency stop valve and the second flame arrester, between the second flame arrester and the second oxygen-enriched flow stop valve, between the second oxygen-enriched emergency stop valve and the third flame arrester, and between the third flame arrester and the second manual stop valve; and a thermometer is also arranged on the pipeline between the manual stop valve and the first flame arrester.
In the invention, an emptying pipeline is arranged in front of the second oxygen-enriched emergency cut-off valve, and a high-point emptying valve is arranged on the emptying pipeline; and the pipeline between the first oxygen-enriched emergency cut-off valve and the second flame arrester is communicated with an emptying pipeline.
In the invention, a second filter and a nitrogen purging seal valve are sequentially arranged on the nitrogen introducing pipeline in series, and the obtained nitrogen introducing pipeline is communicated with a pipeline between the first oxygen-enriched emergency cut-off valve and the second fire arrestor and is also communicated with a pipeline between the oxygen-enriched flow regulating valve and the second oxygen-enriched emergency cut-off valve.
In the invention, an eighth pressure transmitter and a second temperature transmitter are arranged on the air inlet pipeline.
In the invention, the oxygen inlet pipeline and the air inlet pipeline are both communicated with the inlet of the static mixer, the outlet of the static mixer is communicated with the inlet of the compressor, and the outlet of the compressor is communicated with the oxygen-enriched air inlet of the Claus furnace; the compressor is controlled by a compressor monitoring system. In the invention, the compressor inlet pipeline is provided with a compressor inlet online oxygen analyzer, and the compressor outlet pipeline is provided with a compressor outlet online oxygen analyzer.
In the invention, the mixing flow of oxygen and air in the oxygen interface safety device before the compressor and the specific functions of each component are as follows: oxygen sequentially passes through a first manual stop valve, a first flame arrester, an oxygen flow transmitter, a first filter, a first oxygen-enriched emergency cut-off valve, a second flame arrester, an oxygen-enriched flow regulating valve, a second oxygen-enriched emergency cut-off valve, a third flame arrester and a second manual stop valve and is introduced into a static mixer, wherein the first filter can filter out tiny particles and impurities in the oxygen, and the first oxygen-enriched emergency cut-off valve is used for closing the oxygen-enriched uniform mixing monitoring module within 1 second when an emergency (flash explosion) or an accident occurs, cutting off the oxygen and opening a high-point emptying valve; the oxygen passing through the first oxygen-enriched emergency cut-off valve passes through a second flame arrester which is used for blocking sparks and flames generated during adjustment of the oxygen flow regulating valve; the oxygen-enriched flow regulating valve is used for regulating the opening of the oxygen-enriched flow regulating valve by an oxygen-enriched uniform mixing monitoring module according to the oxygen content of an online oxygen analyzer at the inlet of the compressor, so that the oxygen concentration of oxygen-enriched air at the inlet of the compressor is kept at 21-28%; the second oxygen-enriched emergency cut-off valve is used for cutting off the oxygen interface safety device from the compressor within 1 second when an accident occurs, so that oxygen is prevented from entering the compressor, and gas in the compressor is prevented from flowing back into the oxygen interface safety device; the third flame arrester is used for blocking the flame of the oxygen interface safety device in front of the compressor, preventing the flames of the two parties from channeling each other to achieve the purpose of fire prevention, and oxygen enters the static mixer through the second manual stop valve to be fully mixed with air, so that the mixing uniformity of the oxygen and the air reaches more than 95%. The mixed gas of oxygen and air is compressed, boosted and blown by a compressor, and then enters the Claus reaction furnace from the outlet of the compressor.
In the invention, the oxygen flow transmitter, the first to eighth pressure transmitters, the first to second temperature transmitters, the compressor inlet online oxygen analyzer, the compressor outlet online oxygen analyzer and the compressor monitoring system transmit signals to the oxygen-enriched uniform mixing monitoring module, and the oxygen-enriched uniform mixing monitoring module controls the opening degrees of the first oxygen-enriched emergency cut-off valve, the oxygen-enriched flow regulating valve, the second oxygen-enriched emergency cut-off valve, the high-point vent valve and the nitrogen purging seal valve according to the signal values and controls the emergency stop and safety interlock of the oxygen interface safety device in front of the compressor.
In the invention, the oxygen-enriched uniform mixing monitoring module has the following specific functions: signals of the instruments enter an oxygen-enriched uniform mixing monitoring module, the oxygen-enriched uniform mixing monitoring module controls the opening degree of an oxygen-enriched flow regulating valve according to a set mathematical model and received signal values, so that the oxygen content of oxygen-enriched air at an inlet of a compressor is controlled to be more than 21% and less than or equal to 28%, and the temperature of the Claus reaction furnace is guaranteed to be 1500 ℃; the oxygen-enriched uniform mixing monitoring module carries out safety interlock for distinguishing safety accidents and starting ESD (emergency stop) according to oxygen content, pipeline temperature and pipeline pressure, closes the first emergency cut-off valve and the second emergency cut-off valve, opens the high-point air-defense valve, and simultaneously opens the nitrogen purging seal valve to charge nitrogen in the pipeline of the device to achieve an isolated safety state.
The oxygen-enriched uniform mixing monitoring module is a mathematical model arranged in a computer, the mathematical model is not particularly limited, and the functions can be realized by setting according to experience and specific experiments of a person skilled in the art.
In the invention, the front interface safety device of the compressor is preferably mounted in a skid-mounted manner in front of the compressor; the compressor front interface safety device is used for mounting, welding, degreasing, debugging and nitrogen sealing in factory manufacture according to standards strictly. The interface safety device provided by the invention is used as an operation platform, is convenient and reliable to operate, is provided with a computer system (namely an oxygen-enriched uniform mixing monitoring module) for accurately controlling the oxygen content and controlling safety interlocking, and is provided with a flame arrester with a bidirectional flame arresting function, so that the parts cannot be mutually connected in series to detonate when a fire breaks out in a compressor or an oxygen pipeline, and the intrinsic safety of the oxygen-enriched blower system is ensured.
In the present invention, the piping of the compressor front interface safety device and the material of the compressor are preferably austenitic stainless steel or carbon steel, independently. In the specific embodiment of the present invention, it is verified through experiments that the system safety can be ensured by using austenitic stainless steel and carbon steel at the working pressure and gas flow rate in table 2. In the field, oxygen and air are mixed after a compressor by a conventional method, the pressure of a pipeline behind the compressor is more than 0.5MPa, and the oxygen pressure is required to be more than 1.6MPa to realize full mixing, the system provided by the invention mixes the oxygen and the air in front of the compressor, the pressure of the pipeline in front of the compressor is a negative pressure environment, and the compressor has a pressure pumping function, at the moment, the oxygen pressure is 1-2 KPa to ensure full mixing, the invention preferably adopts 15KPa (standard) oxygen in practical application, and the pressure (about 4KPa) before the oxygen enters the compressor can completely meet the mixing requirement through the control of an oxygen interface safety device and corresponding pressure drop, so that a booster set can be saved, and meanwhile, the pipeline can meet the requirement by using common carbon steel, thereby saving the fund, being safe and reliable.
TABLE 2 working pressure and gas flow Rate
In the invention, the flame arrester, the filter, the manual stop valve, the emergency stop valve, the flow control valve, the flow transmitter, the temperature transmitter, the pressure transmitter and the like in the oxygen interface safety device are all selected according to the national oxygen regulation standard of the pressure, the concentration and the temperature of oxygen, and are not limited specifically herein.
When the oxygen interface safety device is designed, the three factors of combustion and explosion are fully considered: combustible matter, oxidant and excitation energy source, wherein the excitation energy source includes following several: a. when the valve is suddenly opened between a high pressure section and a low pressure section, oxygen in the low pressure section is rapidly compressed, so-called adiabatic compression is formed due to the fact that the speed is fast, the heat cannot be dissipated, the local temperature is increased suddenly, and becomes a fire source (excitation energy source), b, when the valve is started, impact, extrusion and friction between a valve clack and a valve seat are achieved, c, material micro-materials (such as iron rust, dust, welding slag, impurity particles and the like) moving at high speed rub with a pipe wall to generate static electricity and sparks, d, a heating surface, flame, radiant heat and other external high temperatures, e, grease ignition, f, iron rust and iron powder have catalytic effects. The invention fully considers the factors in the processes of design, material selection, operation and maintenance, and strictly meets the standard requirements, and provides the oxygen interface safety device, which can strictly monitor and manage the concentration, flow, temperature, pressure, electrostatic discharge and particle filtration of oxygen, and has the advantages of good safety, convenient installation and low cost.
In the present invention, the post-compressor oxygen-enrichment monitoring system includes a post-compressor oxygen-enrichment monitoring module and a monitoring instrument, as specifically shown in fig. 2, in fig. 2: UC-10002A-a compressor rear oxygen enrichment monitoring module, TI-201-a third temperature transmitter, PI-201-an eighth pressure transmitter, an FV-201 main air flow regulating valve, an FC-201 main air flow transmitter, an FV-202 breeze flow regulating valve, an FC-202 breeze flow transmitter, an FI-203 hydrogen sulfide flow transmitter, TI-202-a fourth temperature transmitter, and an ARS-201 tail gas on-line analyzer.
In the invention, the outlet of the compressor is communicated with the oxygen-enriched air inlet of the Claus furnace through a main air pipeline and a breeze pipeline, and the main air pipeline and the breeze pipeline are connected in parallel; the main air pipeline is provided with a main air flow regulating valve, and the micro air pipeline is provided with a micro air flow regulating valve; the Claus furnace is also provided with a hydrogen sulfide inlet pipeline and a fuel gas inlet pipeline, tail gas generated by the Claus furnace is discharged through the catcher, and the catcher is provided with a tail gas discharge pipeline.
In the invention, the monitoring instrument comprises a third temperature transmitter and an eighth pressure transmitter which are arranged at the outlet of the compressor, a main air flow transmitter arranged on a main air pipeline, and a breeze flow transmitter arranged on a breeze pipeline; a hydrogen sulfide flow transmitter arranged on the hydrogen sulfide inlet pipeline; a fourth temperature transmitter arranged on the Claus furnace body; the tail gas on-line analyzer is arranged on the tail gas discharge pipeline; in the invention, the third temperature transmitter and the eighth pressure transmitter are respectively used for monitoring the temperature and the pressure of the outlet of the compressor; the fourth temperature transmitter is used for monitoring the temperature of the hearth of the Claus furnace; the tail gas on-line analyzer is used for monitoring H in tail gas2S and SO2In the embodiment of the present invention, it is preferable to use H in the tail gas2S and SO2The ratio of (A) to (B) is controlled to be 2: 1.
In the invention, the third temperature transmitter, the eighth pressure transmitter, the main air flow transmitter, the breeze flow transmitter, the hydrogen sulfide flow transmitter, the fourth temperature transmitter and the tail gas on-line analyzer transmit signals to the compressor rear oxygen enrichment monitoring module; in addition, the on-line oxygen analyzer at the inlet and the outlet of the compressor and the on-line oxygen analyzer at the outlet of the compressor also transmit signals to the post-compressor oxygen enrichment monitoring module; and the rear oxygen-enriched monitoring module of the compressor adjusts the opening degrees of the main air flow regulating valve and the breeze flow regulating valve and the temperature of a hearth of the Claus furnace according to the signal values and controls emergency stop and safety interlock of the Claus furnace.
In the invention, the oxygen-enriched air entering the Claus furnace is regulated by two paths of flow (main air flow and breeze flow), and finally the oxygen-enriched air flow is controlled to regulate the H in the tail gas2S and SO2The flow rate of (2) is controlled at 1: 2.
In the invention, the flow of the oxygen-enriched air conveyed by the main air pipeline is called as main air flow, the main air flow is obtained by calculating specific data of hydrogen sulfide flow (obtained by monitoring the hydrogen sulfide flow transmitter), the temperature of a hearth of the Claus furnace (obtained by monitoring the fourth temperature transmitter) and the oxygen content of the oxygen-enriched air at the outlet of the compressor (obtained by monitoring the online oxygen analyzer at the outlet of the compressor) by the oxygen-enriched monitoring module behind the compressor, and finally the control of the main air flow is realized by controlling the opening degree of the main air flow regulating valve.
In the invention, the flow of the oxygen-enriched air conveyed by the breeze pipeline is called breeze flow, and the breeze flow is analyzed by an oxygen-enriched monitoring module behind a compressor according to the tail gas in an online analyzer by H2S and SO2The breeze flow is calculated by the parameters, and finally the breeze flow is controlled by controlling the opening of the breeze flow regulating valve.
In the invention, the rear oxygen-enriched monitoring module of the compressor is also used for controlling emergency shutdown and safety interlocking of the Claus furnace, in the specific embodiment of the invention, two parameters of oxygen-enriched overrun and reaction furnace overrun are added on the basis of the original safety interlocking and compressor burner flameout interlocking system of the Claus furnace, and the emergency shutdown and safety interlocking of the Claus furnace are controlled according to the two parameters; in the specific embodiment of the invention, the oxygen enrichment overrun and the reaction furnace overrun are specifically realized by controlling the oxygen content in the oxygen-enriched air to be not more than 28%, and the temperature of the reaction furnace is ensured to be not more than 1500 ℃ through controlling the oxygen content in the oxygen-enriched air.
In the invention, the back oxygen-enriched monitoring module of the compressor is a mathematical model arranged in a computer, the mathematical model is not particularly limited, and the functions can be realized by setting according to experience and specific experiments of technicians in the field.
In a specific embodiment of the invention, the pipelines, instruments and the like in the oxygen-enriched air management system of the sulfur recovery claus furnace are designed strictly according to the national safety standards and requirements on oxygen, and specific reference standards are as follows:
1. safety precautions for oxygen pipeline design, installation and operation management (GB 169912-2008)
2. Seamless steel pipe for transporting fluid (GB/T8163)
3. Stainless steel welded steel pipe for fluid transportation (GB/T12771)
4. Building design fire standard (GB50016)
5. Design Specifications of electric devices for explosion and fire hazard environments (GB50058)
6. Standard of degreasing engineering and acceptance (HG20202)
7. Petrochemical engineering safety instrument system design criteria (SH3018-2003)
8. The International electrotechnical Commission on safety instrumentation System design Specifications and national standards (IEC 6152)/(GB/T21109).
The invention also provides an oxygen-enriched air blast management method for recycling Claus sulfur by using the system in the scheme, which comprises the following steps:
respectively introducing oxygen and air from an oxygen introducing pipeline and an air introducing pipeline of an oxygen-enriched air blast management system of the sulfur recovery Claus furnace, and mixing the oxygen and the air in a static mixer under the control of an oxygen-enriched uniform mixing monitoring module to obtain oxygen-enriched air;
the oxygen-enriched air is compressed by the compressor and then enters the Claus furnace through the main air pipeline and the breeze pipeline, and hydrogen sulfide and fuel gas are introduced into the Claus furnace to react under the control of the oxygen-enriched monitoring system behind the compressor.
According to the invention, oxygen and air are respectively introduced from an oxygen introducing pipeline and an air introducing pipeline of the sulfur recovery Claus furnace oxygen-enriched air blast management system, and are mixed in a static mixer under the control of an oxygen-enriched uniform mixing monitoring module to obtain oxygen-enriched air. In the invention, the pressure of oxygen at the inlet of the oxygen introducing pipeline is less than or equal to 15KPa, preferably 14-15 KPa; the concentration of the oxygen is preferably 95-97%, and the temperature of the oxygen is preferably normal temperature; in the embodiment of the invention, the waste 15KPa standard oxygen of a crude oil field and a nitrogen oxygen station is preferably directly used, so that the cost can be further reduced, and the oxygen pollution caused by directly emptying the waste oxygen can be avoided.
In the invention, the oxygen enters the static mixer through the first manual stop valve, the first flame arrester, the oxygen flow transmitter, the first filter, the first oxygen-enriched emergency cut-off valve, the second flame arrester, the oxygen-enriched flow regulating valve, the second oxygen-enriched emergency cut-off valve, the third flame arrester and the second manual stop valve in sequence, the pressure of the oxygen at the inlet of the static mixer is about 4KPa, and the pressure of the oxygen at the inlet of the static mixer is controlled to be about 4KPa through the control of the oxygen interface safety device and the corresponding pressure drop, so that the requirement of fully mixing with air is completely met.
In the present invention, the pressure of the air at the compressor inlet is preferably-2 KPa, and the temperature of the air is preferably normal temperature; the mixing degree of the oxygen and the air in the static mixer is preferably more than 95%; the oxygen content of the oxygen-enriched air is more than 21% and less than or equal to 28%, and more preferably 27-28%. In a particular embodiment of the invention, the oxygen content of the oxygen-enriched air is preferably flexibly adjusted according to the amount of hydrogen sulfide treated.
After oxygen-enriched air is obtained, the oxygen-enriched air is compressed by a compressor and then enters the Claus furnace through a main air pipeline and a breeze pipeline, hydrogen sulfide and fuel gas are introduced into the Claus furnace, and reaction is carried out under the control of an oxygen-enriched monitoring system behind the compressor. In the invention, the pressure of the oxygen-enriched air at the outlet of the compressor is preferably 0.28-0.32 MPa, and more preferably 0.3 MPa; the residence time of the reaction in the Claus furnace is preferably 1.3-1.4 s; the temperature in the Claus reaction furnace is preferably 1480-1520 ℃, in the specific embodiment of the invention, in order to ensure the system safety, the temperature margin of 20-30 ℃ is preferably set, the temperature in the Claus reaction furnace is more preferably controlled to 1450-1500 ℃, and the pressure in the Claus reaction furnace is preferably 1 KPa.
In the invention, oxygen-enriched air is introduced into a Claus furnace and then reacts with hydrogen sulfide, and the reaction formula is shown as formula I:
H2S+1/2O2→1/xSx+H2o + Q (heat) formula I.
According to the invention, by increasing the oxygen content in the oxygen-enriched air, the hydrogen sulfide treatment capacity of the Claus furnace can be increased, the oxygen content in the gas entering the Claus furnace is increased, the total blast volume of the compressor of the Claus furnace can be reduced, and the reaction retention time is prolonged from 1.2s to 1.3-1.4 s in the traditional method, so that the improvement of the Claus furnace treatment capacity and the improvement of the recovery rate are further ensured.
In the field, the hydrogen sulfide gas contains BTX, which is a harmful pollutant in sulfur recovery and comprises heavy hydrocarbon, mercaptan, cyanide, aromatic hydrocarbon and other heavy pollutants, and the pollutants are decomposed in the claus furnace to ensure that the claus furnace can meet the requirement of environmental protection and emission in the subsequent tail gas treatment process. These contaminants, if not decomposed in the claus reactor, can lead to deactivation of the downstream reactor catalytic cracking, increased bed pressure drop or unacceptable production of "black sulfur". The key to guarantee the decomposition of BTX is the following three points: 1) sufficiently high temperature, 2) sufficiently long residence time, 3) sufficient gas mixing. The temperature is over 1455 ℃, and the reaction residence time is over 1.2s, so that the pollutants can be decomposed. In the method provided by the invention, the temperature in the Claus furnace is 1500 ℃, the reaction residence time is 1.3-1.4 and is more than 1.2s, and the oxygen-enriched combustion enables the thermal oxidation reaction in the Claus furnace to be more violent than the conventional oxidation reaction, so that the gas in the Claus furnace and the oxygen can be fully mixed, and the requirement of the point 3 can be completely met.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example 1
Carrying out oxygen-enriched air blast on a Claus furnace by using the systems in figures 1-2 to recover sulfur, respectively introducing oxygen and air from an oxygen introducing pipeline and an air introducing pipeline of an oxygen-enriched air blast management system of the sulfur recovery Claus furnace, and mixing the oxygen and the air in a static mixer under the control of an oxygen-enriched uniform mixing monitoring module to obtain oxygen-enriched air;
the oxygen concentration is 95%, the pressure of oxygen at an inlet of an oxygen introducing pipeline is 14KPa, the temperature of the oxygen is normal temperature, the oxygen sequentially passes through a first manual stop valve, a first flame arrester, an oxygen flow transmitter, a first filter, a first oxygen-enriched emergency stop valve, a second flame arrester, an oxygen-enriched flow regulating valve, a second oxygen-enriched emergency stop valve, a third flame arrester and a second manual stop valve and enters a static mixer, and the pressure of the oxygen at the inlet of the static mixer is about 4 KPa; the concentration of air is 100%, the pressure is-2 KPa, and the temperature is normal temperature; controlling the oxygen content in the obtained oxygen-enriched air to be 28% by an oxygen-enriched uniform mixing monitoring module;
the oxygen-enriched air is compressed by a compressor and then enters a Claus furnace through a main air pipeline and a breeze pipeline, and hydrogen sulfide and fuel gas are introduced into the Claus furnace and react under the control of an oxygen-enriched monitoring system behind the compressor; wherein the pressure of the oxygen-enriched air at the outlet of the compressor is 0.3MPa, and the main air flow and the breeze flow of the oxygen-enriched air are controlled by the oxygen-enriched monitoring system behind the compressor to ensure the flow and SO of the oxygen-enriched air2The flow ratio of (2) to (1) and controlling H in the tail gas analyzer2S and SO2The ratio of (1) to (2), the temperature in the Claus furnace is controlled to be 1500 ℃, and the reaction residence time is 1.3-1.4 s.
Wherein the pipeline material of oxygen interface safety device before the compressor and the compressor material are carbon steel, and oxygen interface safety device installs before the compressor with sled dress form before the compressor, and in the whole processing procedure, the oxygen boosting is all mixed monitoring module and the oxygen boosting monitored control system behind the compressor and is discerned the safety interlock that starts ESD (emergency shutdown) according to the signal value incident received, guarantees entire system's safe operation.
By utilizing the method in the embodiment to carry out actual operation in the Claus furnace for recycling sulfur in 8 ten thousand tons/year, the hydrogen sulfide treatment capacity of the Claus furnace is improved by 22 percent, the sulfur recovery rate is improved by 1.5 percent, and the tail gas treatment meets the environmental protection requirement in GB 31570-2015.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A sulfur recovery Claus furnace oxygen enrichment blast management system is characterized by comprising a compressor front oxygen interface safety device, a compressor and a compressor rear oxygen enrichment monitoring system;
the front oxygen interface safety device of the compressor comprises an oxygen-enriched uniform mixing monitoring module, an oxygen introducing pipeline, an air introducing pipeline, a nitrogen introducing pipeline and a static mixer, wherein the oxygen introducing pipeline comprises a first manual stop valve, a first flame arrester, an oxygen flow transmitter, a first filter, a first oxygen-enriched emergency stop valve, a second flame arrester, an oxygen-enriched flow regulating valve, a second oxygen-enriched emergency stop valve, a third flame arrester and a second manual stop valve which are sequentially connected in series; a first pressure gauge, a second pressure gauge, a third pressure gauge, a fourth pressure gauge, a fifth pressure gauge, a sixth pressure gauge and a seventh pressure gauge are sequentially arranged on pipelines between the manual stop valve and the first flame arrester, between the oxygen flow transmitter and the first filter, between the first filter and the first oxygen-enriched emergency cut-off valve, between the first oxygen-enriched emergency cut-off valve and the second flame arrester, between the second flame arrester and the second oxygen-enriched flow cut-off valve, between the second oxygen-enriched emergency cut-off valve and the third flame arrester and between the third flame arrester and the second manual stop valve; a thermometer is also arranged on a pipeline between the manual stop valve and the first flame arrester;
an emptying pipeline is arranged in front of the second oxygen-enriched emergency cut-off valve, and a high-point emptying valve is arranged on the emptying pipeline; a pipeline between the first oxygen-enriched emergency cut-off valve and the second flame arrester is communicated with an emptying pipeline;
the nitrogen introducing pipeline is sequentially provided with a second filter and a nitrogen purging seal valve in series, and the obtained nitrogen introducing pipeline is communicated with a pipeline between the first oxygen-enriched emergency cut-off valve and the second flame arrester and is also communicated with a pipeline between the oxygen-enriched flow regulating valve and the second oxygen-enriched emergency cut-off valve;
the air inlet pipeline and the oxygen inlet pipeline are both communicated with the inlet of the static mixer; the outlet of the static mixer is communicated with the inlet of a compressor, and the outlet of the compressor is communicated with the oxygen-enriched air inlet of the Claus furnace; the compressor is controlled by a compressor monitoring system; the compressor inlet pipeline is provided with a compressor inlet online oxygen analyzer, and the compressor outlet pipeline is provided with a compressor outlet online oxygen analyzer;
a first pressure transmitter and a first temperature transmitter are arranged in front of the first filter, a second pressure transmitter is arranged behind the first filter, a third pressure transmitter and a fourth pressure transmitter are respectively arranged in front of and behind the oxygen-enriched flow regulating valve, and a fifth pressure transmitter and a sixth pressure transmitter are respectively arranged in front of and behind the third flame arrester;
a seventh pressure transmitter and a second temperature transmitter are arranged on the air inlet pipeline;
the oxygen flow transmitter, the first to seventh pressure transmitters, the first to second temperature transmitters, the compressor inlet online oxygen analyzer, the compressor outlet online oxygen analyzer and the compressor monitoring system transmit signals to the oxygen-enriched uniform mixing monitoring module, and the oxygen-enriched uniform mixing monitoring module controls the opening degrees of the first oxygen-enriched emergency cut-off valve, the oxygen-enriched flow regulating valve, the second oxygen-enriched emergency cut-off valve, the high-point vent valve and the nitrogen purging seal valve according to the signal values and controls the emergency shutdown and safety interlocking of the oxygen interface safety device in front of the compressor;
the outlet of the compressor is communicated with the oxygen-enriched air inlet of the Claus furnace through a main air pipeline and a breeze pipeline, and the main air pipeline and the breeze pipeline are connected in parallel; the main air pipeline is provided with a main air flow regulating valve, and the micro air pipeline is provided with a micro air flow regulating valve; the Claus furnace is also provided with a hydrogen sulfide inlet pipeline and a fuel gas inlet pipeline, tail gas generated by the Claus furnace is discharged through a trap, and the trap is provided with a tail gas discharge pipeline;
the post-compressor oxygen-enriched monitoring system comprises a post-compressor oxygen-enriched monitoring module and a monitoring instrument; the monitoring instrument comprises a third temperature transmitter and an eighth pressure transmitter which are arranged at the outlet of the compressor, a main air flow transmitter arranged on the main air pipeline, and a breeze flow transmitter arranged on the breeze pipeline; a hydrogen sulfide flow transmitter arranged on the hydrogen sulfide inlet pipeline; a fourth temperature transmitter arranged on the Claus furnace body; the tail gas on-line analyzer is arranged on the tail gas discharge pipeline;
the third temperature transmitter, the eighth pressure transmitter, the main air flow transmitter, the breeze flow transmitter, the hydrogen sulfide flow transmitter, the fourth temperature transmitter, the tail gas online analyzer, the compressor inlet online oxygen analyzer and the compressor outlet online oxygen analyzer transmit signals to the compressor rear oxygen enrichment monitoring module; and the rear compressor oxygen enrichment monitoring module adjusts the opening degrees of the main air flow regulating valve and the breeze flow regulating valve and the temperature of a hearth of the Claus furnace according to the signal values and controls emergency stop and safety interlock of the Claus furnace.
2. The system of claim 1, wherein the piping material and the compressor material in the pre-compressor oxygen interface safety device are independently austenitic stainless steel or carbon steel.
3. The system of claim 1, wherein the pre-compressor oxygen interface safety device is skid mounted in front of the compressor.
4. An oxygen-enriched blast management method for Claus sulfur recovery using the system according to any one of claims 1 to 3, comprising the steps of:
respectively introducing oxygen and air from an oxygen introducing pipeline and an air introducing pipeline of an oxygen-enriched air blast management system of the sulfur recovery Claus furnace, and mixing the oxygen and the air in a static mixer under the control of an oxygen-enriched uniform mixing monitoring module to obtain oxygen-enriched air;
the oxygen-enriched air is compressed by a compressor and then enters a Claus furnace through a main air pipeline and a breeze pipeline, and hydrogen sulfide and fuel gas are introduced into the Claus furnace and react under the control of an oxygen-enriched monitoring system behind the compressor;
wherein the pressure of the oxygen at the inlet of the oxygen introducing pipeline is less than or equal to 15 KPa; the oxygen content of the oxygen-enriched air is more than 21% and less than or equal to 28%.
5. The method of claim 4, wherein the oxygen enters the static mixer sequentially through a first manual shut-off valve, a first flame arrestor, an oxygen flow transmitter, a first filter, a first oxygen-rich emergency shut-off valve, a second flame arrestor, an oxygen-rich flow regulating valve, a second oxygen-rich emergency shut-off valve, a third flame arrestor, and a second manual shut-off valve.
6. The method of claim 4, wherein the degree of mixing of oxygen and air in the static mixer is 95% or more.
7. The method according to claim 4, wherein the pressure of the oxygen-enriched air at the outlet of the compressor is 0.28-0.32 MPa.
8. The method according to claim 4, wherein the residence time of the reaction in the Claus furnace is 1.3 to 1.4 s.
9. The method according to claim 4, wherein the temperature in the Claus reaction furnace is 1480-1520 ℃.
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