阅读说明：本技术 一种煤气精脱硫工艺设备及其工艺 (Gas fine desulfurization process equipment and process thereof ) 是由 许传东 于 2021-09-07 设计创作，主要内容包括：本发明公开了一种煤气精脱硫工艺设备及其工艺,煤气精脱硫技术领域,包括设备本体,所述设备本体包括卧式反应器装置和脱除装置,所述脱除装置包括除雾塔装置、喷射装置、搅拌储存装置、液体输送装置,气体调压装置；所述卧式反应器装置为管道式空塔反应器,所述喷射装置设置在卧式反应器装置的上端,所述喷射装置的下端分别与液体输送装置和气体调压装置连接。本发明通过SACSR氧化药剂+碱法脱硫工艺技术结合可以不受氯离子的影响,可以将有机硫及无机硫碱法脱硫中同步去除,同时SACSR氧化药剂+碱法脱硫工艺技术对反应温度及煤气中的其他杂质都有很好的适应性及选择性,且整体设备结构简单,投资费用和运行成本较低,实施方便,适宜推广使用。(The invention discloses a gas fine desulfurization process device and a process thereof, which belong to the technical field of gas fine desulfurization and comprise a device body, wherein the device body comprises a horizontal reactor device and a removing device, and the removing device comprises a demisting tower device, an injection device, a stirring storage device, a liquid conveying device and a gas pressure regulating device; the horizontal reactor device is a pipeline type empty tower reactor, the injection device is arranged at the upper end of the horizontal reactor device, and the lower end of the injection device is respectively connected with the liquid conveying device and the gas pressure regulating device. The invention can be free from the influence of chloride ions by combining the SACSR oxidation medicament and the alkaline desulfurization process technology, can synchronously remove organic sulfur and inorganic sulfur in the alkaline desulfurization, has good adaptability and selectivity to reaction temperature and other impurities in coal gas, and has simple integral equipment structure, lower investment cost and operation cost, convenient implementation and suitable popularization and use.)

1. A coal gas fine desulfurization process equipment and a process thereof comprise an equipment body, and are characterized in that the equipment body comprises a horizontal reactor device (2) and a removing device, wherein the removing device comprises a demisting tower device (6), a spraying device (1), a stirring storage device (5), a liquid conveying device (3) and a gas pressure regulating device (4);

the horizontal reactor device (2) is a pipeline type empty tower reactor, the injection device (1) is arranged at the upper end of the horizontal reactor device (2), the lower end of the injection device (1) is respectively connected with the liquid conveying device (3) and the gas pressure regulating device (4), one side of the liquid conveying device (3) is connected with the stirring storage device (5), and the liquid conveying device (3) comprises a filter screen and a circulating pump;

the demisting tower device (6) comprises a spray washing structure (601) and a demisting tower (602), wherein the spray washing structure is arranged above the demisting tower (602).

2. The process of the coal gas fine desulfurization process equipment is characterized by comprising the following working steps of:

s1, combining the SACSR reagent oxidation process with the alkaline desulphurization process, and spraying the mixture to a TRT outlet through two biphase atomization spray guns respectively;

s2, leading out blast furnace gas to a desulfurization horizontal reactor device (2) at a TRT outlet in a bypass mode;

s3, removing organic sulfur and inorganic sulfur in the coal gas by adopting SACSR oxidation agent and alkaline desulphurization process technology;

and S4, feeding the purified coal gas into a demisting tower, removing salt-containing water carried by the coal gas, and sending the coal gas to a user pipe network.

3. The fine coal gas desulfurization process equipment according to claim 1, wherein the stirring storage device (5) comprises a driving motor and stirring blades, and oxidant mixed liquid is placed inside the stirring storage device (5).

4. The fine coal gas desulfurization process equipment according to claim 1, wherein said demister (6) comprises a wire mesh demister layer and a plate demister layer.

5. The fine coal gas desulfurization process equipment according to claim 1, characterized in that a water supply device (7) is connected to one side of the liquid conveying device (3).

6. The process of claim 2, wherein the SACSR oxidizing agent process comprises SACSR agent unloading, SACSR agent unloading storage, SACSR delivery, SACSR metering mixing, SACSR metering distribution and two-phase atomizing spray gun ejection.

7. The process of claim 2, wherein the alkaline desulfurization process comprises lye unloading, lye storage, lye conveying, lye metering and mixing, lye metering and dispensing, and two-phase atomizing spray gun spraying.

8. The process of claim 5 or 6, wherein the step S1 further comprises automatic water replenishment, process water storage and process water delivery during the SACSR metering and the lye metering.

Technical Field

The invention relates to the technical field of coal gas fine desulfurization, in particular to coal gas fine desulfurization process equipment and a process thereof.

Background

The sulfur in the coal gas is mostly COS and H₂S is present in the form of COS and H₂S is converted into SO2 after being combusted with gas, local acid rain can be formed when the content of SO2 in the air exceeds the standard, the living environment of people is damaged, and the maximum emission concentration of SO2 of gas points for steel plant gas such as hot blast furnaces, steel rolling heating furnaces, self-contained power plants and the like for combustion gas furnaces and kilns in China is 50mg/m³The ultra-low emission requirement is 35mg/m³In view of the above factors, the removal degree of COS and H2S in producer gas has become an important index for energy conservation and emission reduction in steel mills.

At present, aiming at the existing gas fine desulfurization technology, the process flow scheme in fig. 4 is included, and the main processes are as follows:

the scheme adopts a hydrolysis desulfurization process for removing COS, the blast furnace gas which is dedusted from a cloth bag firstly passes through a dechlorination reactor to remove inorganic chlorine in the gas, the reactor is a circular radial flow reactor, the gas is radially absorbed in the reactor, so that the pressure drop of the reactor is reduced, and four reactors are arranged. The dechlorinated blast furnace gas enters a COS hydrolysis reactor (4 sets are arranged), so that COS in the gas is hydrolyzed and converted into H2S, the gas flows in the reactor in the radial direction, the pressure drop of the reactor is reduced, and the hydrolyzed blast furnace gas enters a TRT power generation system. The blast furnace gas after TRT power generation is cooled to below 50 ℃ and then is subjected to gas-liquid separation, and then is sent to a dry desulphurization device, the equipment design, the pipeline layout, the desulfurizer replacement and the bed resistance are comprehensively considered, the scheme is that the blast furnace gas dry desulphurization reactor adopts a parallel mode, the blast furnace gas enters the reactor from the bottom of the reactor and enters a desulfurizer bed through a low-pressure-drop reactor, and H2S and active components in the desulfurizer undergo chemical reaction, SO that H2S in the blast furnace gas is removed, in order to ensure the desulphurization effect, part of air is fed into an inlet of a blast furnace gas fine-drying desulphurization tower, the blast furnace gas with H2S removed is sent to each fuel gas user, and the process is used for achieving the purpose that the SO2 content of a flue gas outlet is less than 35mg/Nm 3.

Compared with the technology for carrying out coal gas fine desulfurization by catalytic hydrolysis, the hydrolysis catalyst in catalytic hydrolysis needs to completely remove chloride ions in coal gas, the coal gas can enter the hydrolysis reaction tower, the chloride ions have great influence on the service life of the catalyst, the hydrolysis catalyst is easy to cause poisoning failure, the structure is complex, and the phenomena of high investment cost and operation cost, inconvenience in implementation and easiness in influence of the chloride ions exist in the use process.

From the above, we have designed a kind of coal gas fine desulfurization process equipment and its process to solve the above problems.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a coal gas fine desulfurization process device and a process thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a kind of coal gas fine desulfurization process equipment and its craft, including the apparatus body, the said apparatus body includes horizontal reactor device and removal device, the said removal device includes demisting tower device, injection apparatus, stirs the storage device, liquid conveying appliance, gas pressure regulating device;

the horizontal reactor device is a pipeline type empty tower reactor, the injection device is arranged at the upper end of the horizontal reactor device, the lower end of the injection device is respectively connected with the liquid conveying device and the gas pressure regulating device, one side of the liquid conveying device is connected with the stirring storage device, and the liquid conveying device comprises a filter screen and a circulating pump;

the demisting tower device comprises a spray washing structure and a demisting tower, wherein the spray washing structure is arranged above the demisting tower.

1. The process of the coal gas fine desulfurization process equipment is characterized by comprising the following working steps of:

s1, combining an SACSR oxidation agent process with an alkaline desulfurization process, and respectively spraying the mixture into a reactor at a TRT outlet through two sets of two-phase atomization spraying devices;

s2, leading out blast furnace gas to a desulfurization horizontal reactor device at a TRT outlet in a bypass mode;

s3, removing organic sulfur and inorganic sulfur in the coal gas by adopting SACSR oxidation agent and alkaline desulphurization process technology;

and S4, feeding the purified coal gas into a demisting tower, removing salt-containing water carried by the coal gas, and sending the coal gas to a user pipe network.

Preferably, the stirring and storing device comprises a driving motor and a stirring blade, and the oxidant mixed liquid is placed in the stirring and storing device.

Preferably, the defogging tower device comprises a wire mesh defogging layer and a plate-type defogging layer.

Preferably, a water supply device is connected to one side of the liquid delivery device.

Preferably, the SACSR oxidizing agent process comprises SACSR agent unloading, SACSR agent unloading storage, SACSR delivery, SACSR metered mixing, SACSR metered dispensing, and dual phase atomizing spray gun ejection.

Preferably, the alkali desulphurization process comprises alkali liquor unloading, alkali liquor storage, alkali liquor conveying, alkali liquor metering and mixing, alkali liquor metering and distributing and spraying by a two-phase atomizing spray gun.

Preferably, the step S further comprises automatic water replenishing, process water storage and process water delivery during the SACSR metering and the lye metering.

Compared with the prior art, the invention has the beneficial effects that: the injection device is arranged at the upper end of the horizontal reactor device, the lower end of the injection device is respectively connected with the liquid conveying device and the gas pressure regulating device, one side of the liquid conveying device is connected with the stirring storage device, when in use, the gas pressure regulating device and the liquid conveying device can directly enter the horizontal reactor device together through the injection device after the gas pressure regulating device carries out alkaline desulfurization work, so that the desulfurization of the SACSR oxidizing agent and the alkaline desulfurization process technology can be realized, the SACSR oxidizing agent and the alkaline desulfurization process technology can not be influenced by chloride ions and can be synchronously removed with hydrogen sulfide in the alkaline desulfurization, meanwhile, the SACSR oxidizing agent and the alkaline desulfurization process technology have good adaptability and selectivity to reaction temperature and other impurities in coal gas, the whole equipment structure is simple, the investment cost and the operation cost are lower, convenient implementation and suitable popularization and application.

Drawings

FIG. 1 is a schematic structural diagram of a gas fine desulfurization process device and a process thereof according to the present invention;

FIG. 2 is a schematic structural diagram of a demisting tower device of the gas fine desulfurization process equipment and the process thereof provided by the invention;

FIG. 3 is a flow chart of the process equipment and the process for fine desulfurization of coal gas according to the present invention;

FIG. 4 is a flow chart of the background art of the fine desulfurization process equipment and the process thereof for coal gas.

In the figure: the device comprises a spraying device 1, a horizontal reactor device 2, a liquid conveying device 3, a gas pressure regulating device 4, a stirring storage device 5, a demisting tower device 6, a spray flushing structure 601, a demisting tower 602 and a water supply device 7.

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.

Referring to fig. 1-3, a gas fine desulfurization process equipment and a process thereof, comprising an equipment body, wherein the equipment body comprises a horizontal reactor device 2 and a removing device, and the removing device comprises a demisting tower device 6, a spraying device 1, a stirring storage device 5, a liquid conveying device 3 and a gas pressure regulating device 4;

the horizontal reactor device 2 is a pipeline type empty tower reactor, the injection device 1 is arranged at the upper end of the horizontal reactor device 2, the lower end of the injection device 1 is respectively connected with the liquid conveying device 3 and the gas pressure regulating device 4, one side of the liquid conveying device 3 is connected with the stirring storage device 5, and the liquid conveying device 3 comprises a filter screen and a circulating pump;

the demisting tower device 6 comprises a spray washing structure 601 and a demisting tower 602, wherein the spray washing structure is arranged above the demisting tower 602;

more specifically, stirring storage device 5 includes driving motor and stirring leaf, and stirring storage device 5 is inside to have placed the mixed liquid of oxidant, and defogging tower device 6 includes silk screen defogging layer and board-like defogging layer, and one side of liquid conveyor 3 is connected with water supply installation 7.

Example one

The process of the coal gas fine desulfurization process equipment comprises the following working steps:

s1, combining the SACSR reagent oxidation process with the alkaline desulphurization process, and spraying the mixture to a TRT outlet through two biphase atomization spray guns respectively;

s2, leading out blast furnace gas to a desulfurization horizontal reactor device 2 at a TRT outlet in a bypass mode;

s3, removing organic sulfur and inorganic sulfur in the coal gas by adopting SACSR oxidation agent and alkaline desulphurization process technology;

and S4, feeding the purified coal gas into a demisting tower, removing salt-containing water carried by the coal gas, and sending the coal gas to a user pipe network.

The SACSR oxidation agent process comprises SACSR agent unloading, SACSR agent unloading and storing, SACSR conveying, SACSR metering and mixing, SACSR metering and distributing and two-phase atomization spray gun spraying, the alkali desulphurization process comprises alkali liquor unloading, alkali liquor storing, alkali liquor conveying, alkali liquor metering and mixing, alkali liquor metering and distributing and two-phase atomization spray gun spraying, and the step S1 further comprises automatic water replenishing, process water storing and process water conveying during SACSR metering and mixing and alkali liquor metering and mixing.

At the TRT outlet, the blast furnace gas is led out to the desulfurization reactor in the form of a bypass. The organic sulfur and inorganic sulfur in the coal gas are removed by adopting SACSR oxidizing agent and alkaline desulphurization process technology. The purified coal gas enters a demisting tower, and the coal gas is sent to a user pipe network after salt-containing water is removed.

Wherein, desulfurization system waste water gets into effluent disposal system, and clear liquid can return the system reuse, improves the circulation economic benefits of system. The SACSR oxidation medicament and alkaline desulphurization process technology has high desulphurization efficiency, strong system adaptability and stable operation, and can realize the low emission requirement that SO2 is emitted to be less than 50mg/Nm3 after multi-purpose gas point combustion and the ultra-low emission target of less than 35mg/Nm3 in a long term after source treatment.

The invention provides a gas fine desulfurization process device and a process thereof, which comprise a horizontal reactor device and a removal device, wherein the horizontal reactor device is a pipeline type empty tower reactor, can provide a space for the reaction of gas and an oxidant, and simultaneously reduces the gas flow rate and increases the time for the reaction of the oxidant and the gas; the removing device comprises a spraying device, a stirring and storing device, a liquid conveying device and a gas pressure regulating device; the injection device is arranged at the upper end of the reactor, and the design of the stirring storage device can ensure that the oxidant can be uniformly mixed and then stored, improve the uniformity of the oxidant and keep strong oxidizing property; the liquid conveying device comprises a filter screen and a circulating pump; the gas pressure regulating device provides gas source power for the injection device and simultaneously ensures the stability of the pressure of the gas source; the design of the injection device at the upper end of the horizontal reactor device can inject the oxidant into the reactor in the form of uniform and fine particles, so that the oxidant can effectively and fully react with the sulfide; the liquid conveying device and the circulating pump are designed to provide power for the spraying device.

Wherein, the design of defogging tower device can be with the product desorption principle after the reaction: the oxidation reagent mainly generates sulfur dioxide and partial sulfur trioxide after reacting with carbonyl sulfide, and mainly generates sodium sulfite and partial sodium sulfate after contacting and reacting with alkali liquor in the reactor, the generated reactant mainly exists in coal gas in the form of liquid ions, and liquid water and liquid ions can be effectively removed through the demisting tower, so that the reactant is prevented from escaping, and meanwhile, most of liquid water is removed, and finally, the desulfurization efficiency is ensured.

The two processes are compared as follows:

the comparison with the catalytic hydrolysis process is as follows:

1. low investment cost

The system has simple equipment, does not need to greatly reform the original system, has investment cost about 50 percent of the traditional process, and has obvious economic benefit.

2. Low running cost

The system has low operation cost, small system resistance, no high-power operation equipment and small medicament consumption, and the operation cost is 50 to 70 percent of that of the catalytic hydrolysis process.

3. Small floor area

The equipment has small occupied area, can be arranged on the spot after TRT, has lower requirement on site, overcomes the problem of insufficient space of certain factories, and solves the problem of large occupied area caused by multi-tower construction in catalytic hydrolysis.

4. Reducing multi-point treatment in source treatment

The source treatment mode meets the national requirements of strengthening source treatment of blast furnace gas and implementing the large administrative policy of fine desulfurization and production in enterprises, and compared with catalytic hydrolysis, the problem of multi-point emission is also solved.

5. Easy to implement

The system has small engineering quantity, small resistance to the original system, no obvious increase of the system resistance and short construction period.

6. High adaptability

The fluctuation of the sulfur content of the blast furnace gas is large, the desulfurization system can be adjusted in time along with the change of the sulfur content, the operation is convenient, the coordination is good, and the adaptability is strong.

7. Solves the influence of the chlorine ions in the coal gas

Compared with catalytic hydrolysis, the hydrolysis catalyst in catalytic hydrolysis needs to completely remove chloride ions in coal gas, the coal gas can enter a hydrolysis reaction tower, the chloride ions have great influence on the service life of the catalyst, the hydrolysis catalyst is easy to poison and lose efficacy, the SACSR oxidation reagent and alkaline desulphurization process technology can not be influenced by the chloride ions, the SACSR oxidation reagent and alkaline desulphurization process technology can be synchronously removed with hydrogen sulfide in alkaline desulphurization, and meanwhile, the SACSR oxidation reagent and alkaline desulphurization process technology has good adaptability and selectivity to reaction temperature and other impurities in the coal gas.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.