CN113773880A

CN113773880A - Blast furnace gas fine desulfurization device

Info

Publication number: CN113773880A
Application number: CN202111061447.6A
Authority: CN
Inventors: 刘森
Original assignee: BEIJING IVYQUEN ENERGY SAVING TECHNOLOGIES Ltd
Current assignee: BEIJING IVYQUEN ENERGY SAVING TECHNOLOGIES Ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2021-12-10

Abstract

The invention relates to a blast furnace gas fine desulfurization device, which comprises a first hydrolysis device, a second hydrolysis device and a third hydrolysis device, wherein the first hydrolysis device is used for pretreating blast furnace gas; the second hydrolysis device is arranged above the first hydrolysis device and is used for carrying out catalytic hydrolysis on the pretreated blast furnace gas; the desulfurization device is arranged above the second hydrolysis device and is used for adsorbing inorganic sulfur in the blast furnace gas; the first recovery device is connected with the gas outlet of the first hydrolysis device and the gas inlet of the first hydrolysis device and is used for recovering the blast furnace gas which is unqualified in pretreatment; and the second recovery device is connected with the gas inlet of the second hydrolysis device and the gas outlet of the second hydrolysis device and is used for recovering the blast furnace gas which is not qualified after hydrolysis. According to the invention, the central control unit is arranged, and the central control unit controls parameters of all parts according to the comparison of the sulfur content of the pretreated blast furnace gas obtained by the first detection device with the preset value, so that the sulfur content of the discharged blast furnace gas meets the preset standard.

Description

Blast furnace gas fine desulfurization device

Technical Field

The invention relates to the field of desulfurization, in particular to a blast furnace gas fine desulfurization device.

Background

In the coke oven gas production process, the gas usually contains a large amount of sulfur, which is a byproduct of steel enterprises, and the blast furnace gas is mainly used as a fuel for users such as hot blast stoves, steel rolling heat treatment furnaces and boilers to burn and heat, but in the continuous production process, the sulfur in the gas is often formed into thick paste, and impurities such as secondary salt and the like are adsorbed in a screen mesh of a filter, so that the whole filter is blocked, the sulfur content of the gas is increased, and in order to ensure the product quality of the gas, the filter is arranged in a desulfurization tank to adsorb the sulfur in the gas. The sulfur in blast furnace gas is mainly carbonyl sulfide and hydrogen sulfide, and also contains a small amount of various organic sulfur components such as carbon disulfide, methyl mercaptan, ethyl mercaptan and the like, so that sulfur dioxide pollution emission is generated during combustion. The state has strict standards for the emission of sulfur dioxide. Therefore, steel mills must be treated from the source, and more enterprises are required to set up the blast furnace gas combustion desulfurization process. Compared with a desulfurization process after combustion, the desulfurization process before combustion has the following advantages that (1) the corrosion effect of hydrogen sulfate formed after hydrogen sulfide is dissolved in condensed water of coal gas on a pipeline is reduced, and the safety of coal gas conveying is improved; (2) the sulfur can be removed in a centralized way in the front-end procedure at one time, and the sulfur dioxide emission of the whole plant is managed and controlled; (3) by adopting the pre-desulfurization process, the subsequent denitration of the flue gas is facilitated, the influence of sulfur dioxide on the denitration catalyst is avoided, and the cost for using the catalyst can be reduced. Therefore, for iron and steel enterprises, the blast furnace gas desulfurization is not only beneficial to the control of sulfur dioxide emission of the whole plant, but also can reduce the corrosion to pipelines and equipment in the gas conveying process, improve the production safety and generate better economic benefit. But the prior desulfurization process cannot control the sulfur content of the blast furnace flue gas discharged after desulfurization in an intermediate step.

Disclosure of Invention

Therefore, the invention provides a blast furnace gas fine desulfurization device which can solve the technical problem that the discharge of the blast furnace gas cannot be controlled according to the sulfur content of the blast furnace gas subjected to catalytic hydrolysis at each stage.

In order to achieve the above object, the present invention provides a blast furnace gas fine desulfurization apparatus comprising:

the first hydrolysis device is used for pretreating blast furnace gas and comprises a first stirring mechanism arranged in a first hydrolysis chamber, the first stirring mechanism comprises a first sliding rod, a first motor arranged on the first sliding rod and a first stirring plate connected with the first motor, a first pressure sensor and a plurality of air holes are arranged on the first stirring plate, and the first pressure sensor is used for acquiring the pressure of the gas on the first stirring plate;

the second hydrolysis device is arranged above the first hydrolysis device, is used for performing catalytic hydrolysis on the pretreated blast furnace gas, and comprises a second stirring mechanism for stirring, wherein the second stirring mechanism comprises a second sliding rod, a second motor arranged on the second sliding rod and a second stirring plate connected with the second motor, a second pressure sensor and a plurality of air holes are arranged on the second stirring plate, and the second pressure sensor is used for acquiring the pressure of the gas on the second stirring plate;

the desulfurization device is arranged above the second hydrolysis device and used for adsorbing inorganic sulfur in the blast furnace gas, and comprises a catalyst plate for adsorbing the inorganic sulfur and a sprayer for spraying liquid;

the first recovery device is connected with the gas outlet of the first hydrolysis device and the gas inlet of the first hydrolysis device and is used for recovering the blast furnace gas which is unqualified in pretreatment;

the second recovery device is connected with the gas inlet of the second hydrolysis device and the gas outlet of the second hydrolysis device and is used for recovering the blast furnace gas which is not qualified after hydrolysis;

the detection device comprises a first detection device arranged between the first hydrolysis device and the second hydrolysis device and a second detection device arranged between the second hydrolysis device and the desulfurization device, wherein the first detection device is used for obtaining the sulfur content of the pretreated blast furnace gas, the second detection device is used for obtaining the sulfur content of the catalytic hydrolyzed blast furnace gas, the central control unit compares the sulfur content of the pretreated blast furnace gas obtained by the first detection device with a preset value, adjusts the stirring frequency of the first stirring mechanism by controlling a first motor, adjusts the stirring frequency of the second stirring mechanism by controlling a second motor and controls a first conveying pump to adjust the recovery amount of the first recovery device, and the central control unit compares the sulfur content of the catalytic hydrolyzed blast furnace gas obtained by the second detection device with the preset value, the stirring frequency of the first stirring mechanism is adjusted by controlling a first motor, the stirring frequency of the second stirring mechanism is adjusted by controlling a second motor, and the recovery amount of the second recovery device is adjusted by controlling a second delivery pump, wherein the central control unit compares the pressure value obtained by the first pressure sensor and the pressure value obtained by the second pressure sensor with preset values respectively, and readjusts the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism, so that the sulfur content of the discharged blast furnace gas meets the preset standard.

Further, the central control unit sets a reference value SY of the sulfur content of the pretreatment, acquires the sulfur content of the blast furnace gas after the pretreatment through the first detection device as SY, and selects the stirring speed of the first stirring mechanism, the stirring speed of the second stirring mechanism and the recovery amount of the first recovery device, wherein,

when SY is less than or equal to SY1, the central control unit judges that the sulfur content of the pretreated blast furnace gas meets the preset standard, selects a first preset first stirring mechanism stirring speed VA1 as the first stirring mechanism stirring speed, selects a first preset second stirring mechanism stirring speed VB1 as the second stirring mechanism stirring speed, and does not recover the pretreated blast furnace gas;

when SY1 is more than SY and less than SY2, the central control unit judges that the sulfur content of the blast furnace gas after pretreatment meets the preset standard, selects a second preset first stirring mechanism stirring speed VA2 as the first stirring mechanism stirring speed, selects a second preset second stirring mechanism stirring speed VB2 as the second stirring mechanism stirring speed, and selects a first preset first recovery device recovery amount QA1 as the first recovery device recovery amount;

when SY is larger than or equal to SY2, the central control unit judges that the sulfur content of the blast furnace gas after pretreatment does not meet the preset standard, the central control unit selects a third preset first stirring mechanism stirring speed VA3 as the first stirring mechanism stirring speed, selects a third preset second stirring mechanism stirring speed VB3 as the second stirring mechanism stirring speed, and selects a second preset first recovery device recovery amount QA2 as the first recovery device recovery amount;

the central control unit presets a reference value SY of the pre-processing sulfur content, sets a first reference value SY1 of the pre-processing sulfur content and a second reference value SY2 of the pre-processing sulfur content, presets a stirring speed VA of a first stirring mechanism, sets a stirring speed VA1 of the first stirring mechanism, a stirring speed VA2 of a second stirring mechanism and a stirring speed VA3 of a third stirring mechanism, presets a stirring speed VB of the second stirring mechanism, sets a stirring speed VB1 of the first stirring mechanism, a stirring speed VB2 of the second stirring mechanism and a stirring speed VB3 of the third stirring mechanism, presets a recovery amount of the first recovery device and sets a recovery amount QA1 of the first recovery device and a recovery amount QA2 of the second recovery device.

Further, the central control unit sets a reference value SC for the sulfur content of the blast furnace gas after catalytic hydrolysis, acquires the sulfur content of the blast furnace gas after catalytic hydrolysis as SC through the second detection device, adjusts the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism, and selects the recovery amount of the second recovery device, wherein,

when the SC is less than or equal to SC1, the central control unit judges that the sulfur content of the blast furnace gas after catalytic hydrolysis meets the preset standard, the central control unit increases the stirring speed VAi of the selected first stirring mechanism to VAi1 (improves catalyst mixing), increases the stirring speed VBj of the selected second stirring mechanism to VBj1 (improves efficiency), and does not recover the blast furnace gas after catalytic hydrolysis;

when SC1 is more than SC and less than SC2, the central control unit judges that the sulfur content of the blast furnace gas after catalytic hydrolysis meets a preset standard, the central control unit does not adjust the stirring speed VAi of the selected first stirring mechanism and the stirring speed VBj of the selected second stirring mechanism, and meanwhile, the central control unit selects the recovery amount QB1 of the first preset second recovery device as the recovery amount of the second recovery device;

when the SC is more than or equal to SC2, the central control unit judges that the sulfur content of the blast furnace gas after catalytic hydrolysis does not meet the preset standard, the central control unit reduces the stirring speed VAi of the selected first stirring mechanism to VAi2, reduces the stirring speed VBj of the selected second stirring mechanism to VBj2, and simultaneously selects the second preset second recovery device recovery amount QB2 as the second recovery device recovery amount;

the central control unit presets a second recovery device recovery amount QB, sets a first preset second recovery device recovery amount QB1, and sets a second preset second recovery device recovery amount QB2, where i is 1,2,3, and j is 1,2, 3.

Further, the sulfur content of the blast furnace gas after catalytic hydrolysis, which is obtained by the central control unit, is less than or equal to a preset reference value of the sulfur content of the blast furnace gas after catalytic hydrolysis, the central control unit increases the stirring speed VAi of the selected first stirring mechanism to VAi1, sets VAi1 ═ VAi × (1+ VJ), increases the stirring speed VBj of the selected second stirring mechanism to VBj1, and sets VBj1 ═ VBj × (1+ VJ), wherein VJ is a stirring speed compensation parameter.

Further, the sulfur content of the blast furnace gas after catalytic hydrolysis, which is obtained by the central control unit, is greater than or equal to a preset reference value of the sulfur content of the blast furnace gas after catalytic hydrolysis, the central control unit determines that the sulfur content of the blast furnace gas after catalytic hydrolysis does not meet a preset standard, the central control unit reduces the stirring speed VAi of the selected first stirring mechanism to VAi2, sets VAi2 to VAi x (1-VJ), reduces the stirring speed VBj of the selected second stirring mechanism to VBj2, and sets VBj2 to VBj x (1-VJ).

Further, the central control unit obtains a pressure value f1 of the blast furnace gas to the first stirring plate through the first pressure sensor, compares the pressure value f1 with a preset first stirring plate pressure value FA, selects a stirring speed compensation parameter to compensate the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism, wherein,

when f1 is not more than FA1, the central control unit selects a first preset stirring rate compensation parameter VJ1 as a stirring rate compensation parameter;

when the FA1 is more than f1 and more than FA2, the central control unit selects a second preset stirring speed compensation parameter VJ2 as a stirring speed compensation parameter;

when the F1 is not less than F2 and not more than FA3, the central control unit selects a third preset stirring speed compensation parameter VJ3 as a stirring speed compensation parameter;

when f1 is greater than FA3, the central control unit selects a fourth preset stirring rate compensation parameter VJ4 as a stirring rate compensation parameter;

the central control unit presets a stirring speed compensation parameter VJ, and sets a first preset stirring speed compensation parameter VJ1, a second preset stirring speed compensation parameter VJ2, a third preset stirring speed compensation parameter VJ3 and a fourth preset stirring speed compensation parameter VJ 4.

Further, the central control unit obtains the pressure f2 of the blast furnace gas on the second stirring plate through the second pressure sensor, compares the pressure f2 with a preset pressure value FB of the second stirring plate, and adjusts the selected stirring rate compensation parameter VJr, wherein,

when f2 is not less than FB1, the central control unit increases the selected stirring rate compensation parameter VJr to VJr1, and sets VJr1 to VJr x (1+ (FB1-f2)/FB 1);

when FB1 is more than f2 and less than FB2, the central control unit does not adjust the selected stirring speed compensation parameters;

when f2 is not less than FB2, the central control unit reduces the selected stirring rate compensation parameter VJr to VJr2, and sets VJr2 to VJr x (1- (f2-FB2)/FB 2);

the central control unit presets a second stirring board pressure value FB, sets a first preset second stirring board pressure value FB1 and a second preset second stirring board pressure value FB2, wherein r is 1,2,3 and 4.

Further, the central control unit presets a first stirring mechanism stirring speed standard value VA0, and adjusts the power parameter DA of the first motor according to the obtained real-time stirring speed VA' of the first stirring mechanism and the preset first stirring mechanism stirring speed standard value VA0, wherein,

when VA 'is not less than VA0, the central control unit increases the power parameter DA of the first motor to DA1, and sets DA1 to DA x (1+ (VA' -VA0)/VA 0);

when VA '< VA0, the central control unit increases the power parameter DA of the first electric machine to DA1, and sets DA1 ═ DA × (1- (VA 0-VA')/VA 0).

Further, the central control unit presets a second stirring mechanism stirring speed standard value VB0, and adjusts the power parameter DB of the second motor according to the obtained real-time stirring speed VB' of the second stirring mechanism and the preset second stirring mechanism stirring speed standard value VB0, wherein,

when VB 'is not less than VB0, the central control unit increases the power parameter DB of the second motor to DB1 and sets DB1 to DB x (1+ (VB' -VB0)/VB 0);

when VB '< VB0, the central control unit increases the power parameter DB of the second motor to DB1, and sets DB1 to DB x (1- (VB 0-VB')/VB 0).

The detection device further comprises a detection chamber, a special-shaped three-way valve for controlling the gas inlet and outlet of the blast furnace and a fluorescence intensity detector for obtaining the fluorescence intensity of the solution, wherein a 4-sodium amino-sulfonate solution and manganese dioxide nanosheet composite system is filled in the detection chamber, when the central control unit judges that the sulfur content of the current blast furnace gas is detected, the central control unit closes a first passage of the special-shaped three-way valve, opens a second passage of the special-shaped three-way valve, and detects the current blast furnace gas entering the detection chamber, and obtains a fluorescence intensity change value delta Y within a preset detection time t according to the fluorescence intensity detector, obtains the sulfur content S of the current blast furnace gas, and sets S to be (delta Y-a)/b, wherein a is 90 and b is 10.

Compared with the prior art, the invention has the advantages that the invention is realized by arranging the central control unit, the central control unit compares the sulfur content of the pretreated blast furnace gas obtained by the first detection device with the preset value, adjusts the stirring frequency of the first stirring mechanism by controlling the first motor, adjusts the stirring frequency of the second stirring mechanism by controlling the second motor and controls the first delivery pump to adjust the recovery amount of the first recovery device, the central control unit compares the sulfur content of the blast furnace gas after catalytic hydrolysis obtained by the second detection device with the preset value, adjusts the stirring frequency of the first stirring mechanism by controlling the first motor, adjusts the stirring frequency of the second stirring mechanism by controlling the second motor and controls the second delivery pump to adjust the recovery amount of the second recovery device, wherein the pressure value obtained by the central control unit through the first pressure sensor and the pressure value obtained by the second pressure sensor are respectively compared with the preset value, and the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism are regulated again, so that the sulfur content of the discharged blast furnace gas meets the preset standard.

In particular, the invention divides the reference value of the pre-treatment sulfur content into two definite standards, the pre-treatment real-time sulfur content obtained by the first detection device is compared with the reference value of the pre-treatment sulfur content, the central control unit judges whether the sulfur content of the blast furnace gas after the pre-treatment meets the preset standards, and simultaneously selects the corresponding first stirring mechanism stirring speed, second stirring mechanism stirring speed and first recovery device recovery amount, wherein if the pre-treatment real-time sulfur content is less than or equal to the reference value of the first pre-treatment sulfur content, the current blast furnace gas pre-treatment sulfur removal effect is better, the central control unit judges that the current pre-treatment blast furnace gas sulfur content meets the preset standards, therefore, the central control unit selects the larger first pre-set first stirring mechanism stirring speed and the larger first pre-set second stirring mechanism stirring speed as the stirring speed of the first hydrolysis device and the stirring speed of the second hydrolysis device, the uniformity of the catalyst in the first hydrolysis chamber and the second hydrolysis chamber is improved, the retention time of the blast furnace gas on the surface of the catalyst is shortened, the desulfurization efficiency of the blast furnace gas is improved, and simultaneously, the real-time sulfur content is lower, so that the central control unit does not recover the blast furnace gas which is currently treated and processed, if the real-time sulfur content after pretreatment is between a first preset reference value of the pretreatment sulfur content and a second reference value of the pretreatment sulfur content, the sulfur removal effect of the pretreatment of the blast furnace gas meets the preset standard, the central control unit selects the second preset first stirring speed as the first stirring speed, selects the second preset second stirring speed as the second stirring speed, so as to prolong the retention time of the blast furnace gas and the surface of the catalyst in the first hydrolysis chamber and the second hydrolysis chamber, and selects the first recovery device as the first recovery amount, the method includes the steps that the sulfur content of blast furnace gas after next pretreatment is avoided not meeting a preset standard, if the real-time sulfur content after pretreatment is larger than or equal to a reference value of the sulfur content of second preset pretreatment, it is indicated that the sulfur removal effect of the blast furnace gas pretreatment does not meet the preset standard, a central control unit selects the stirring speed of a third preset first stirring mechanism as the stirring speed of a first stirring mechanism, selects the stirring speed of a third preset second stirring mechanism as the stirring speed of a second stirring mechanism, so that the retention time of the blast furnace gas and the surface of a catalyst in a first hydrolysis chamber and a second hydrolysis chamber is further prolonged, the desulfurization effect of the blast furnace gas is improved, and simultaneously selects the recovery amount of a second preset first recovery device as a first recovery device, so that the recovery amount of the unqualified blast furnace gas is improved, and the sulfur content of the discharged blast furnace gas meets the standard.

In particular, a reference value of the sulfur content of blast furnace gas after catalytic hydrolysis is arranged in the control unit, a second detection device is used for obtaining the comparison between the sulfur content of the blast furnace gas after current catalytic hydrolysis and the reference value of the sulfur content of the blast furnace gas after preset catalytic hydrolysis, the stirring speed of the selected first stirring mechanism and the stirring speed of the selected second stirring mechanism are adjusted, and the recovery rate of the second recovery device is selected, wherein if the sulfur content of the blast furnace gas after current catalytic hydrolysis is less than or equal to the reference value of the sulfur content of the blast furnace gas after first preset catalytic hydrolysis, the central control unit judges that the sulfur content of the blast furnace gas after catalytic hydrolysis meets the preset standard, the central control unit increases the stirring speed of the selected first stirring mechanism by taking the stirring speed compensation parameter as a reference so as to accelerate the mixing and stirring of the catalyst in the first hydrolysis chamber, and increases the stirring speed of the second stirring mechanism by taking the stirring speed compensation parameter as a reference so as to increase the catalytic hydrolysis efficiency of the blast furnace gas in the second hydrolysis chamber, improving the desulfurization efficiency of the catalytic hydrolysis of the blast furnace gas, simultaneously not recovering the blast furnace gas after the current catalytic hydrolysis, if the sulfur content of the blast furnace gas after the current catalytic hydrolysis is at a reference value of the sulfur content of the blast furnace gas after the first preset catalytic hydrolysis and a reference value of the sulfur content of the blast furnace gas after the second preset catalytic hydrolysis, the central control unit judges that the sulfur content of the blast furnace gas after the current catalytic hydrolysis meets a preset standard, the central control unit does not adjust the stirring speed VAi of the selected first stirring mechanism and the stirring speed VBj of the selected second stirring mechanism, the central control unit selects a smaller recovery amount of the first preset second recovery device as the recovery amount of the second recovery device to recover part of the blast furnace gas so as to avoid that the sulfur content of the blast furnace gas after the catalytic hydrolysis of the next blast furnace gas does not meet the preset standard, if the sulfur content of the blast furnace gas after the current catalytic hydrolysis is greater than or equal to the reference value of the sulfur content of the blast furnace gas after the second preset catalytic hydrolysis, the central control unit judges that the sulfur content of the blast furnace gas after catalytic hydrolysis does not meet the preset standard, in order to avoid the sulfur content of the blast furnace gas after the next blast furnace gas after catalytic hydrolysis does not meet the preset standard, the central control unit takes the stirring speed compensation parameter as a reference quantity to further improve the removal rate of the sulfur content of the pretreatment by reducing the stirring speed of the selected first stirring mechanism so as to prolong the contact time of the blast furnace gas and the surface of the catalyst in the first hydrolysis chamber, the stirring speed of the second stirring mechanism is reduced by taking the stirring speed compensation parameter as a reference quantity so as to prolong the contact time of the blast furnace gas and the surface of the catalyst in the second hydrolysis chamber and further improve the catalytic hydrolysis efficiency of the blast furnace gas, meanwhile, the middle control unit selects a larger second preset second recovery device to recover more unqualified blast furnace gas, so that the discharge failure caused by over-high sulfur content of the blast furnace gas treated by the desulfurization device is avoided.

Particularly, when the control unit acquires the pressure of the blast furnace gas in the first hydrolysis chamber through the first pressure sensor, the pressure of the blast furnace gas on the first stirring plate is compared with a first stirring plate pressure value preset by the central control unit, and the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism are compensated, wherein the central control unit judges the current blast furnace gas introduction amount into the first hydrolysis chamber according to the acquired pressure value of the blast furnace gas on the first stirring plate and the preset first stirring plate pressure value, and selects a preset stirring speed compensation parameter which is adaptive to the ventilation amount as a compensation parameter for increasing or decreasing the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism, so that the stirring speed of the stirring mechanism is adaptive to the blast furnace gas introduction amount.

In particular, the invention provides that the blast furnace gas after being pretreated in the second hydrolysis chamber is obtained by the second pressure sensor and compared with a preset second stirring plate pressure value, the central control unit adjusts the selected stirring speed compensation parameter, wherein if the pressure of the blast furnace gas on the second stirring plate is less than or equal to a first preset second stirring plate pressure value, the central control unit increases the stirring speed compensation parameter based on the pressure value obtained by the second sensor and the first preset second stirring plate pressure value to further increase the compensated first stirring mechanism stirring speed and second stirring mechanism stirring speed, and meanwhile, if the pressure of the blast furnace gas on the second stirring plate is at the first preset second stirring plate pressure value and the second preset second stirring plate pressure value, the central control unit does not adjust the selected stirring speed compensation parameter, and if the pressure of the blast furnace gas on the second stirring plate is greater than or equal to the second preset second stirring plate pressure value, the central control unit takes the pressure value obtained by the second sensor and a second preset second stirring plate pressure value as references to improve the stirring speed compensation parameter so as to further reduce the stirring speed of the compensated first stirring mechanism and the stirring speed of the second stirring mechanism, and further improve the desulfurization efficiency.

In particular, the invention sets the standard value of the stirring speed of the first stirring mechanism, the central control unit compares the obtained stirring speed of the first stirring mechanism with the preset standard value of the stirring speed of the first stirring mechanism, the power parameter of the first motor is increased or reduced by taking the difference value between the stirring speed of the first stirring mechanism and the preset standard value of the stirring speed of the first stirring mechanism as a reference so as to enable the power parameter of the first motor to be matched with the stirring speed of the first stirring mechanism, meanwhile, the invention sets the standard value of the stirring speed of the second stirring mechanism, and the central control unit compares the obtained stirring speed of the second stirring mechanism with the preset standard value of the stirring speed of the second stirring mechanism, and the difference value between the stirring speed of the second stirring mechanism and the preset standard value of the stirring speed of the second stirring mechanism is used as a reference, and the power parameter of the second motor is increased or reduced, so that the power parameter of the second motor is matched with the stirring speed of the second stirring mechanism.

Particularly, the invention uses a complex system of 4-amino-sodium sulfonate solution and manganese dioxide nanosheet as the detection liquid of the sulfur content of the blast furnace gas, and obtains the sulfur content of the blast furnace gas passing through the detection liquid according to the change value of the fluorescence intensity of the detection liquid within the preset time.

Drawings

FIG. 1 is a schematic structural diagram of a blast furnace gas fine desulfurization device according to an embodiment of the invention;

FIG. 2 is a schematic structural view of a stirring plate according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a special-shaped three-way valve according to an embodiment of the invention.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Please refer to fig. 1, which is a diagram of a blast furnace gas fine desulfurization device according to an embodiment of the present invention, including a first hydrolysis device configured to pre-treat blast furnace gas, and including a first stirring mechanism disposed in a first hydrolysis chamber, where the first stirring mechanism includes a first sliding rod, a first motor disposed on the first sliding rod, and a first stirring plate connected to the first motor, the first stirring plate is provided with a first pressure sensor and a plurality of air vents, and the first pressure sensor is configured to obtain a pressure of the gas on the first stirring plate; the second hydrolysis device is arranged above the first hydrolysis device, is used for performing catalytic hydrolysis on the pretreated blast furnace gas, and comprises a second stirring mechanism for stirring, wherein the second stirring mechanism comprises a second sliding rod, a second motor arranged on the second sliding rod and a second stirring plate connected with the second motor, a second pressure sensor and a plurality of air holes are arranged on the second stirring plate, and the second pressure sensor is used for acquiring the pressure of the gas on the second stirring plate; the desulfurization device is arranged above the second hydrolysis device and used for adsorbing inorganic sulfur in the blast furnace gas, and comprises a catalyst plate for adsorbing the inorganic sulfur and a sprayer for spraying liquid; the first recovery device is connected with the gas outlet of the first hydrolysis device and the gas inlet of the first hydrolysis device and is used for recovering the blast furnace gas which is unqualified in pretreatment; the second recovery device is connected with the gas inlet of the second hydrolysis device and the gas outlet of the second hydrolysis device and is used for recovering the blast furnace gas which is not qualified after hydrolysis; the detection device comprises a first detection device arranged between the first hydrolysis device and the second hydrolysis device and a second detection device arranged between the second hydrolysis device and the desulfurization device, wherein the first detection device is used for obtaining the sulfur content of the pretreated blast furnace gas, the second detection device is used for obtaining the sulfur content of the catalytic hydrolyzed blast furnace gas, the central control unit compares the sulfur content of the pretreated blast furnace gas obtained by the first detection device with a preset value, adjusts the stirring frequency of the first stirring mechanism by controlling a first motor, adjusts the stirring frequency of the second stirring mechanism by controlling a second motor and controls a first conveying pump to adjust the recovery amount of the first recovery device, and the central control unit compares the sulfur content of the catalytic hydrolyzed blast furnace gas obtained by the second detection device with the preset value, the stirring frequency of the first stirring mechanism is adjusted by controlling a first motor, the stirring frequency of the second stirring mechanism is adjusted by controlling a second motor, and the recovery amount of the second recovery device is adjusted by controlling a second delivery pump, wherein the central control unit compares the pressure value obtained by the first pressure sensor and the pressure value obtained by the second pressure sensor with preset values respectively, and readjusts the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism, so that the sulfur content of the discharged blast furnace gas meets the preset standard.

With reference to fig. 1, the first hydrolysis apparatus 1 includes a first hydrolysis chamber, a first stirring mechanism disposed in the first hydrolysis chamber, an air inlet 11 disposed at the bottom of the first hydrolysis chamber, and a first feeding hole 13 for injecting a catalyst into the first hydrolysis chamber, wherein a first electromagnetic valve is disposed at the first feeding hole, the first electromagnetic valve is used for controlling an injection amount of the catalyst into the first hydrolysis chamber, and the first stirring mechanism includes a first sliding rod 14, a first motor 15 disposed on the first sliding rod, and a first stirring plate 18 connected to the first motor. Fig. 2 is a schematic view of a structure of a stirring plate according to an embodiment of the present invention, in which a first pressure sensor 17 and a plurality of air holes 181 are disposed on the first stirring plate. The first pressure sensor is used for acquiring the pressure of the coal gas on the first stirring plate, and the first sliding rod is further provided with a first sliding sleeve 12 which is connected with the first stirring plate and used for enabling the first stirring plate to move up and down stably.

With reference to fig. 1, the second hydrolysis apparatus 2 includes a second hydrolysis chamber, a second stirring mechanism for stirring, and a second feeding hole disposed at the top of the second hydrolysis chamber, a second electromagnetic valve 26 is arranged at the second feeding port and is used for controlling the input amount of the catalyst injected into the second hydrolysis chamber, wherein the second stirring mechanism comprises a second sliding rod 22, a second motor 23 arranged on the second sliding rod and a second stirring plate 27 connected with the second motor, the second stirring plate is provided with a second pressure sensor 24 and a plurality of air holes, the second pressure sensor is used for acquiring the pressure of the coal gas on the second stirring plate, and the second sliding rod is also provided with a second sliding sleeve 21 which is connected with the second stirring plate and used for enabling the second stirring plate to move up and down stably.

With continued reference to fig. 1, the desulfurization unit 3 includes a catalyst plate 33 for adsorbing inorganic sulfur, a shower 32 for spraying liquid, and an exhaust port 31 for discharging qualified blast furnace gas. A first recovery device 4 comprising a first conduit 41 connected to the gas outlet of the first hydrolysis device and the gas inlet of the first hydrolysis device, and a first transfer pump 42 for controlling the recovery amount. And the second recovery device 5 comprises a second pipeline 51 connected with the air inlet of the second hydrolysis device and the air outlet of the second hydrolysis device, and a second conveying pump 52 used for controlling the recovery amount. The detection device comprises a first detection device 7 and a second detection device 6.

In use, a catalyst is put into the first hydrolysis chamber through the first feed inlet, blast furnace gas to be treated is injected into the first hydrolysis chamber through the gas inlet, the first motor drives the first stirring plate to move up and down, the uniform mixing of the catalyst is accelerated, delaying the retention time of blast furnace gas on the surface of a catalyst, accelerating the catalytic hydrolysis efficiency, after a first preset detection time, judging that the pretreated blast furnace gas is detected by a central control unit, judging that a second passage 162 of a first special-shaped three-way valve 16 is opened by the central control unit, enabling the pretreated blast furnace gas to enter a first detection device for detecting the sulfur content, if the detection is qualified, closing the second passage of the first special-shaped three-way valve by the central control unit, opening a first passage 161, injecting the qualified blast furnace gas into a second hydrolysis chamber through a connecting pipe between the first hydrolysis chamber and the second hydrolysis chamber, and if the detection is unqualified, controlling a first conveying pump to recycle the current blast furnace gas to an air inlet for retreatment by the central control unit; after the blast furnace gas injected into the second hydrolysis chamber is subjected to catalytic hydrolysis, after a first preset detection time, the central control unit judges that the blast furnace gas subjected to catalytic hydrolysis is detected, the central control unit judges that a second passage of a second special-shaped tee 25 is opened, so that the pretreated blast furnace gas enters a second detection device to be subjected to sulfur content detection, if the detection is qualified, the central control unit closes the second passage of the second special-shaped tee, opens the first passage, the blast furnace gas subjected to qualified detection is injected into the desulfurization device through a connecting pipe between the second hydrolysis chamber and the desulfurization device, and if the detection is unqualified, the central control unit controls a second conveying pump to recycle the current blast furnace gas to an air inlet of the second hydrolysis chamber to be subjected to catalytic hydrolysis again; the qualified blast furnace gas after two detections is subjected to inorganic sulfur removal under the combined action of the catalyst layer loaded with the catalyst and the sprayer, so that the desulfurization work of the blast furnace gas is completed and the blast furnace gas is discharged through the exhaust port.

The central control unit sets a reference value SY of the sulfur content of the pretreatment, acquires the sulfur content of the blast furnace gas after the pretreatment through the first detection device as SY, and selects the stirring speed of the first stirring mechanism, the stirring speed of the second stirring mechanism and the recovery amount of the first recovery device, wherein,

Specifically, the invention divides a preset reference value of the pre-treatment sulfur content into two definite standards, compares the pre-treatment real-time sulfur content obtained by a first detection device with the preset reference value of the pre-treatment sulfur content, a central control unit judges whether the sulfur content of the blast furnace gas after treatment meets the preset standard, and simultaneously selects a corresponding first stirring mechanism stirring speed, a second stirring mechanism stirring speed and a first recovery device recovery amount, wherein if the pre-treatment real-time sulfur content is less than or equal to the first reference value of the pre-treatment sulfur content, the current blast furnace gas pre-treatment sulfur removal effect is better, the central control unit judges that the current pre-treatment blast furnace gas sulfur content meets the preset standard, therefore, the central control unit selects a larger first preset first stirring mechanism stirring speed and a larger first preset second stirring mechanism stirring speed as the stirring speed of a first hydrolysis device and the stirring speed of a second hydrolysis device, the uniformity of the catalyst in the first hydrolysis chamber and the second hydrolysis chamber is improved, the retention time of the blast furnace gas on the surface of the catalyst is shortened, the desulfurization efficiency of the blast furnace gas is improved, and simultaneously, the real-time sulfur content is lower, so that the central control unit does not recover the blast furnace gas which is currently treated and processed, if the real-time sulfur content after pretreatment is between a first preset reference value of the pretreatment sulfur content and a second reference value of the pretreatment sulfur content, the sulfur removal effect of the pretreatment of the blast furnace gas meets the preset standard, the central control unit selects the second preset first stirring speed as the first stirring speed, selects the second preset second stirring speed as the second stirring speed, so as to prolong the retention time of the blast furnace gas and the surface of the catalyst in the first hydrolysis chamber and the second hydrolysis chamber, and selects the first recovery device as the first recovery amount, the method includes the steps that the sulfur content of blast furnace gas after next pretreatment is avoided not meeting a preset standard, if the real-time sulfur content after pretreatment is larger than or equal to a reference value of the sulfur content of second preset pretreatment, it is indicated that the sulfur removal effect of the blast furnace gas pretreatment does not meet the preset standard, a central control unit selects the stirring speed of a third preset first stirring mechanism as the stirring speed of a first stirring mechanism, selects the stirring speed of a third preset second stirring mechanism as the stirring speed of a second stirring mechanism, so that the retention time of the blast furnace gas and the surface of a catalyst in a first hydrolysis chamber and a second hydrolysis chamber is further prolonged, the desulfurization effect of the blast furnace gas is improved, and simultaneously selects the recovery amount of a second preset first recovery device as a first recovery device, so that the recovery amount of the unqualified blast furnace gas is improved, and the sulfur content of the discharged blast furnace gas meets the standard.

The central control unit sets a reference value SC of the sulfur content of the blast furnace gas after catalytic hydrolysis, acquires the sulfur content of the blast furnace gas after catalytic hydrolysis as SC through the second detection device, adjusts the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism, and selects the recovery amount of the second recovery device, wherein,

The sulfur content of the blast furnace gas after catalytic hydrolysis, which is acquired by the central control unit, is less than or equal to a preset reference value of the sulfur content of the blast furnace gas after catalytic hydrolysis, the central control unit increases the stirring speed VAi of the selected first stirring mechanism to VAi1, sets VAi1 ═ VAi x (1+ VJ), increases the stirring speed VBj of the selected second stirring mechanism to VBj1, and sets VBj1 ═ VBj x (1+ VJ), wherein VJ is a stirring speed compensation parameter.

The method comprises the steps that the sulfur content of blast furnace gas obtained by the central control unit after catalytic hydrolysis is larger than or equal to a preset reference value of the sulfur content of the blast furnace gas after catalytic hydrolysis, the central control unit judges that the sulfur content of the blast furnace gas after catalytic hydrolysis does not meet a preset standard, the central control unit reduces the stirring speed VAi of a selected first stirring mechanism to VAi2, sets VAi2 to VAi x (1-VJ), reduces the stirring speed VBj of a selected second stirring mechanism to VBj2, and sets VBj2 to VBj x (1-VJ).

Wherein, a control unit of the invention is internally provided with a reference value of the sulfur content of blast furnace gas after catalytic hydrolysis, and a second detection device is used for obtaining the sulfur content of the blast furnace gas after current catalytic hydrolysis and comparing the sulfur content of the blast furnace gas after preset catalytic hydrolysis with the reference value of the sulfur content of the blast furnace gas after preset catalytic hydrolysis, adjusting the stirring speed of a selected first stirring mechanism and the stirring speed of a selected second stirring mechanism, and selecting the recovery rate of a second recovery device at the same time, wherein if the sulfur content of the blast furnace gas after current catalytic hydrolysis is less than or equal to the reference value of the sulfur content of the blast furnace gas after first preset catalytic hydrolysis, a central control unit judges that the sulfur content of the blast furnace gas after catalytic hydrolysis meets a preset standard, the central control unit increases the stirring speed of the selected first stirring mechanism by taking a stirring speed compensation parameter as a reference so as to accelerate the mixing and stirring of a catalyst in a first hydrolysis chamber, and increases the stirring speed of the second stirring mechanism by taking the stirring speed compensation parameter as a reference so as to improve the catalytic hydrolysis efficiency of the blast furnace gas in a second hydrolysis chamber, improving the desulfurization efficiency of the catalytic hydrolysis of the blast furnace gas, simultaneously not recovering the blast furnace gas after the current catalytic hydrolysis, if the sulfur content of the blast furnace gas after the current catalytic hydrolysis is at a reference value of the sulfur content of the blast furnace gas after the first preset catalytic hydrolysis and a reference value of the sulfur content of the blast furnace gas after the second preset catalytic hydrolysis, the central control unit judges that the sulfur content of the blast furnace gas after the current catalytic hydrolysis meets a preset standard, the central control unit does not adjust the stirring speed VAi of the selected first stirring mechanism and the stirring speed VBj of the selected second stirring mechanism, the central control unit selects a smaller recovery amount of the first preset second recovery device as the recovery amount of the second recovery device to recover part of the blast furnace gas so as to avoid that the sulfur content of the blast furnace gas after the catalytic hydrolysis of the next blast furnace gas does not meet the preset standard, if the sulfur content of the blast furnace gas after the current catalytic hydrolysis is greater than or equal to the reference value of the sulfur content of the blast furnace gas after the second preset catalytic hydrolysis, the central control unit judges that the sulfur content of the blast furnace gas after catalytic hydrolysis does not meet the preset standard, in order to avoid the sulfur content of the blast furnace gas after the next blast furnace gas after catalytic hydrolysis does not meet the preset standard, the central control unit takes the stirring speed compensation parameter as a reference quantity to further improve the removal rate of the sulfur content of the pretreatment by reducing the stirring speed of the selected first stirring mechanism so as to prolong the contact time of the blast furnace gas and the surface of the catalyst in the first hydrolysis chamber, the stirring speed of the second stirring mechanism is reduced by taking the stirring speed compensation parameter as a reference quantity so as to prolong the contact time of the blast furnace gas and the surface of the catalyst in the second hydrolysis chamber and further improve the catalytic hydrolysis efficiency of the blast furnace gas, meanwhile, the middle control unit selects a larger second preset second recovery device to recover more unqualified blast furnace gas, so that the discharge failure caused by over-high sulfur content of the blast furnace gas treated by the desulfurization device is avoided.

The central control unit obtains a pressure value f1 of the blast furnace gas to the first stirring plate through the first pressure sensor, compares the pressure value f1 with a preset first stirring plate pressure value FA, selects a stirring speed compensation parameter to compensate the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism, wherein,

Specifically, each parameter in the embodiment of the invention is determined according to the desulfurization amount of the blast furnace gas, the embodiment of the invention provides a preferable parameter, and the reference value of the pretreatment sulfur content is 700-900mg/Nm³Wherein the first pre-set pre-treatment sulfur content reference value is 700mg/Nm³The second predetermined pretreatment sulfur content reference value is 900mg/Nm³Presetting a reference value of 400-500mg/Nm for the sulfur content of the blast furnace gas after catalytic hydrolysis³Wherein the reference value of the sulfur content of the blast furnace gas after the first preset catalytic hydrolysis is 400mg/Nm³The second preset reference value of the sulfur content of the blast furnace gas after catalytic hydrolysis is 500mg/Nm³The stirring speed of the first stirring mechanism is preset to be 50-300r/min, wherein the stirring speed of the first stirring mechanism is preset to be 300r/min, the stirring speed of the second stirring mechanism is preset to be 200r/min, the stirring speed of the first stirring mechanism is preset to be 50r/min, the stirring speed of the second stirring mechanism is preset to be 100-fold-material 200r/min, the stirring speed of the first stirring mechanism is preset to be 200r/min, the stirring speed of the second stirring mechanism is preset to be 150r/min, the stirring speed of the third stirring mechanism is preset to be 100r/min, and the recovery amount of the first recovery device is preset to be 200-fold-material 400m³Wherein the first preset first recovery device has a recovery amount of 200m³The second preset recovery amount of the first recovery device is 400m³The recovery amount of the second recovery device is preset to 300-³The first preset second recovery device recovers 300m³The second preset recovery amount of the first recovery device is 500m³。

Specifically, when the control unit acquires the pressure of the blast furnace gas in the first hydrolysis chamber through the first pressure sensor, the pressure of the blast furnace gas on the first stirring plate is compared with a first stirring plate pressure value preset by the central control unit, and the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism are compensated, wherein the central control unit judges the current blast furnace gas introduction amount into the first hydrolysis chamber according to the acquired pressure value of the blast furnace gas on the first stirring plate and the preset first stirring plate pressure value, and selects a preset stirring speed compensation parameter which is adaptive to the ventilation amount as a compensation parameter for increasing or decreasing the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism, so that the stirring speed of the stirring mechanism is adaptive to the blast furnace gas introduction amount.

The central control unit obtains the pressure f2 of the blast furnace gas on the second stirring plate through the second pressure sensor and compares the pressure with the preset pressure value FB of the second stirring plate, and the central control unit adjusts the selected stirring speed compensation parameter VJr, wherein,

Specifically, the invention includes that a second pressure sensor is used for acquiring blast furnace gas which is introduced into a second hydrolysis chamber for pretreatment, and comparing the blast furnace gas with a preset second stirring plate pressure value, a central control unit is used for adjusting a selected stirring speed compensation parameter, wherein if the pressure of the blast furnace gas on a second stirring plate is smaller than or equal to a first preset second stirring plate pressure value, the central control unit increases the stirring speed compensation parameter by taking the pressure value acquired by the second sensor and the first preset second stirring plate pressure value as a reference so as to further increase the compensated first stirring mechanism stirring speed and second stirring mechanism stirring speed, meanwhile, if the pressure of the blast furnace gas on the second stirring plate is at the first preset second stirring plate pressure value and a second preset second stirring plate pressure value, the central control unit does not adjust the selected stirring speed compensation parameter, and if the pressure of the blast furnace gas on the second stirring plate is larger than or equal to the second preset second stirring plate pressure value, the central control unit takes the pressure value obtained by the second sensor and a second preset second stirring plate pressure value as references to improve the stirring speed compensation parameter so as to further reduce the stirring speed of the compensated first stirring mechanism and the stirring speed of the second stirring mechanism, and further improve the desulfurization efficiency.

The central control unit presets a first stirring mechanism stirring speed standard value VA0, and adjusts the power parameter DA of the first motor according to the obtained real-time stirring speed VA' of the first stirring mechanism and the preset first stirring mechanism stirring speed standard value VA0, wherein,

The central control unit presets a second stirring mechanism stirring speed standard value VB0, and adjusts the power parameter DB of the second motor according to the obtained real-time stirring speed VB' of the second stirring mechanism and a preset second stirring mechanism stirring speed standard value VB0, wherein,

Wherein, the invention sets the standard value of the stirring speed of the first stirring mechanism, the central control unit compares the obtained stirring speed of the first stirring mechanism with the preset standard value of the stirring speed of the first stirring mechanism, the power parameter of the first motor is increased or reduced by taking the difference value between the stirring speed of the first stirring mechanism and the preset standard value of the stirring speed of the first stirring mechanism as a reference so as to enable the power parameter of the first motor to be matched with the stirring speed of the first stirring mechanism, meanwhile, the invention sets the standard value of the stirring speed of the second stirring mechanism, and the central control unit compares the obtained stirring speed of the second stirring mechanism with the preset standard value of the stirring speed of the second stirring mechanism, and the difference value between the stirring speed of the second stirring mechanism and the preset standard value of the stirring speed of the second stirring mechanism is used as a reference, and the power parameter of the second motor is increased or reduced, so that the power parameter of the second motor is matched with the stirring speed of the second stirring mechanism.

The detection device comprises a detection chamber, a special-shaped three-way valve and a fluorescence intensity detector, wherein the special-shaped three-way valve is used for controlling the gas of the blast furnace to enter and exit, the fluorescence intensity detector is used for obtaining the fluorescence intensity of the solution, a 4-amino-sodium sulfonate solution and manganese dioxide nanosheet composite system is filled in the detection chamber, when the central control unit judges that the sulfur content of the gas of the blast furnace is detected currently, the central control unit closes a first passage of the special-shaped three-way valve and opens a second passage of the special-shaped three-way valve, the gas of the blast furnace enters the detection chamber to be detected currently, the central control unit obtains the change value delta Y of the fluorescence intensity within preset detection time t according to the fluorescence intensity detector, obtains the sulfur content S of the gas of the blast furnace, and sets the S to be (delta Y-a)/b, wherein a is 90, and b is 10.

According to the invention, a 4-amino-sodium sulfonate solution and manganese dioxide nanosheet complex system is used as a detection liquid of the sulfur content of blast furnace gas, and the sulfur content of the blast furnace gas passing through the detection liquid is obtained according to the change value of fluorescence intensity of the detection liquid within a preset time.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims

1. A blast furnace gas fine desulfurization device is characterized by comprising:

2. The blast furnace gas fine desulfurization apparatus according to claim 1, wherein the central control unit sets a reference value SY for the sulfur content of the pretreated blast furnace gas, the central control unit obtains the sulfur content of the pretreated blast furnace gas through the first detection device as SY, and selects the stirring speed of the first stirring mechanism, the stirring speed of the second stirring mechanism and the recovery amount of the first recovery device, wherein,

3. The blast furnace gas fine desulfurization device according to claim 2, wherein the central control unit sets a reference value SC for the sulfur content of the blast furnace gas after catalytic hydrolysis, obtains the sulfur content of the blast furnace gas after catalytic hydrolysis as SC through the second detection device, adjusts the stirring rate of the first stirring mechanism and the stirring rate of the second stirring mechanism, and simultaneously selects the recovery amount of the second recovery device,

4. The blast furnace gas fine desulfurization device according to claim 3, wherein the sulfur content of the blast furnace gas after catalytic hydrolysis obtained by the central control unit is less than or equal to a preset reference value of the sulfur content of the blast furnace gas after catalytic hydrolysis, the central control unit increases the stirring speed VAi of the selected first stirring mechanism to VAi1, sets VAi1 ═ VAi x (1+ VJ), increases the stirring speed VBj of the selected second stirring mechanism to VBj1, and sets VBj1 ═ VBj x (1+ VJ), wherein VJ is a stirring speed compensation parameter.

5. The blast furnace gas fine desulfurization device according to claim 3, wherein the sulfur content of the blast furnace gas after catalytic hydrolysis obtained by the central control unit is greater than or equal to a preset reference value of the sulfur content of the blast furnace gas after catalytic hydrolysis, the central control unit determines that the sulfur content of the blast furnace gas after catalytic hydrolysis does not meet a preset standard, the central control unit reduces the stirring speed VAi of the selected first stirring mechanism to VAi2, sets VAi2 to VAi x (1-VJ), reduces the stirring speed VBj of the selected second stirring mechanism to VBj2, and sets VBj2 to VBj x (1-VJ).

6. The blast furnace gas fine desulfurization device according to claim 4, wherein the central control unit obtains the pressure value f1 of the blast furnace gas on the first stirring plate through the first pressure sensor, compares the pressure value with a preset first stirring plate pressure value FA, and selects a stirring speed compensation parameter to compensate the stirring speed of the first stirring mechanism and the stirring speed of the second stirring mechanism, wherein,

7. The blast furnace gas fine desulfurization device according to claim 6, wherein the central control unit obtains the pressure f2 of the blast furnace gas on the second stirring plate through the second pressure sensor and compares the pressure with the preset pressure FB of the second stirring plate, and the central control unit adjusts the selected stirring rate compensation parameter VJr, wherein,

8. The blast furnace gas fine desulfurization device according to claim 5, wherein the central control unit presets a first stirring mechanism stirring rate standard value VA0, and adjusts the power parameter DA of the first motor according to the obtained real-time stirring rate VA' of the first stirring mechanism and the preset first stirring mechanism stirring rate standard value VA0, wherein,

9. The blast furnace gas fine desulfurization device according to claim 5, wherein the central control unit presets a second stirring mechanism stirring speed standard value VB0, and adjusts the power parameter DB of the second motor according to the obtained real-time stirring speed VB' of the second stirring mechanism and the preset second stirring mechanism stirring speed standard value VB0, wherein,

10. The blast furnace gas fine desulfurization device according to claim 1, characterized in that the detection device comprises a detection chamber, a special-shaped three-way valve for controlling the inlet and outlet of blast furnace gas, and a fluorescence intensity detector for obtaining the fluorescence intensity of the solution, when a 4-amino-sodium sulfonate solution and manganese dioxide nanosheet composite system is filled in the detection chamber, and the central control unit determines to detect the sulfur content of the blast furnace gas at present, the central control unit closes the first passage of the special-shaped three-way valve and opens the second passage of the special-shaped three-way valve, and detecting the current blast furnace gas entering the detection chamber, acquiring the current blast furnace gas sulfur content S by the central control unit according to the fluorescence intensity change value delta Y within the preset detection time t acquired by the fluorescence intensity detector, and setting S as (delta Y-a)/b, wherein a is 90 and b is 10.