CN217855489U

CN217855489U - Air inlet structure and catalytic flue gas desulfurization device

Info

Publication number: CN217855489U
Application number: CN202220774149.5U
Authority: CN
Inventors: 李新; 黄昆明; 吴波; 朱伟; 朱敦龙; 唐柯; 蒲长根; 李江荣
Original assignee: Chengdu Daqi Environmental Technology Co ltd
Current assignee: Chengdu Daqi Technology Co ltd
Priority date: 2022-04-02
Filing date: 2022-04-02
Publication date: 2022-11-22
Anticipated expiration: 2032-04-02

Abstract

The utility model discloses an inlet structure and catalytic process flue gas desulfurization device. The air inlet structure comprises an air inlet main pipe and air inlet branch pipes, and the number of the air inlet branch pipes is matched with that of the desulfurization reactors; the gas inlet branch pipe is provided with a descending section and an ascending section which are sequentially arranged between the gas inlet main pipe and the desulfurization reactor; a liquid inlet and a liquid outlet are arranged on the pipe body of the air inlet branch pipe; the air intake structure further includes: the liquid conveying component is used for conveying liquid into the corresponding gas inlet branch pipe for liquid seal when the desulfurization catalyst in the desulfurization reactor is regenerated; and the liquid drainage assembly is used for draining the liquid seal liquid in the air inlet branch pipe after the regeneration of the desulfurization catalyst is finished. When desulfurization reactor sprayed regeneration, can cut off the inflow of treating the desulfurization gas through the mode of liquid seal, not only the gas tightness is showing and is promoting, avoids the installation and the maintenance of valve moreover, and it is more convenient to use.

Description

Air inlet structure and catalytic flue gas desulfurization device

Technical Field

The utility model relates to a flue gas desulfurization's technical field especially relates to catalytic process flue gas desulfurization's technical field, particularly, relates to inlet structure and catalytic process flue gas desulfurization device.

Background

The catalytic flue gas desulfurization technology is taken as a known desulfurization technology with particular application prospect, and the basic principle is as follows: when the humidified flue gas to be desulfurized passes through the desulfurization catalyst bed layer from bottom to top, sulfur dioxide, water, oxygen and sulfuric acid mist in the flue gas to be desulfurized are adsorbed on the surface and in pores of the desulfurization catalyst, and the sulfur dioxide is synchronously catalyzed and oxidized by the desulfurization catalyst to generate sulfuric acid under the low-temperature condition, so that the desulfurization effect of removing the sulfur dioxide and the sulfuric acid mist is finally achieved.

In a catalytic flue gas desulfurization device, a plurality of desulfurization reactors connected in parallel are usually arranged, the humidified gas to be desulfurized in a main gas inlet pipe is divided and enters a gas inlet branch pipe and then is input into the corresponding desulfurization reactor, and the desulfurized flue gas desulfurized by the plurality of desulfurization reactors is collected in an original chimney to be discharged or enters the next working section. During operation, the desulfurization reactor is cycled on a regeneration standby state, at which time the flow of the gas to be desulfurized in the corresponding gas inlet branch pipe needs to be cut off.

The traditional cutting-off mode is to set up the valve on the inlet branch pipe, but to large-scale desulphurization unit, the pipe diameter of inlet branch pipe is great, has restricted model selection, installation and the maintenance of valve greatly. In the humidification mode, in order to improve the mixing effect of the water vapor and the flue gas to be desulfurized, the water vapor at the air outlet of the humidification pipe is generally in countercurrent contact with the flue gas to be desulfurized, but the contact surface of the humidification pipe inserted into the air inlet main pipe and the flue gas to be desulfurized is rapidly corroded. The desulfurization catalyst is regenerated by spraying, but the spraying pipeline is arranged disorderly and is not easy to install and overhaul, and the pipeline and the spray head are easy to damage and not easy to replace. The regenerated acid liquid generated by spraying is easy to flow into the air inlet branch pipe through the air inlet on the desulfurization reactor, so that the outlet end of the air inlet branch pipe is corroded.

SUMMERY OF THE UTILITY MODEL

In a first aspect, an object of the utility model is to provide an air inlet structure to solve the technical problem of the lectotype, installation and the maintenance difficulty that exist of valve in the current mode of cutting off.

In order to realize the purpose of the above-mentioned first aspect, the utility model provides a first kind of air inlet structure, technical scheme is as follows:

the gas inlet structure is used for inputting gas to be desulfurized into a desulfurization reactor filled with a desulfurization catalyst in the catalytic flue gas desulfurization device, and comprises a main gas inlet pipe and a branch gas inlet pipe, wherein the number of the branch gas inlet pipes is matched with that of the desulfurization reactor; the air inlet branch pipe is provided with a descending section and an ascending section which are sequentially arranged between the air inlet main pipe and the air inlet of the desulfurization reactor.

Furthermore, the input end of the descending segment is higher than the output end of the ascending segment; and/or a liquid inlet and a liquid outlet are arranged on the pipe body of the air inlet branch pipe.

Furthermore, an overflow port for preventing liquid seal liquid from flowing into the desulfurization reactor is also arranged on the pipe body of the air inlet branch pipe; and/or the air inlet branch pipe is U-shaped.

Further, the overflow port and/or the liquid discharge port are/is communicated with the regeneration liquid tank, preferably, the regeneration liquid tank is at least two, the concentration of the sulfuric acid changes in a gradient manner, and the liquid seal liquid in the air inlet branch pipe is discharged into the regeneration liquid tank with the lowest concentration of the sulfuric acid.

Furthermore, the air inlet branch pipe comprises a first horizontal pipe, a first bent pipe, a first vertical pipe, a second bent pipe, a second horizontal pipe, a third bent pipe, a second vertical pipe, a fourth bent pipe and a third horizontal pipe which are connected in sequence; the liquid inlet is preferably arranged on the first vertical pipe; the liquid outlet is preferably arranged on the second horizontal pipe; the overflow outlet is preferably provided at the lower side of the fourth elbow.

Furthermore, the height difference between the top of the liquid inlet and the bottom of the first horizontal pipe is more than or equal to 400mm, and the height difference between the bottom of the liquid inlet and the liquid seal surface is more than or equal to 130mm.

Further, the length of the second horizontal pipe is 200-400 mm; the distance between the top of the second horizontal pipe and the liquid seal liquid level is more than or equal to 350mm.

Furthermore, the flow rate of the gas to be desulfurized in the main gas inlet pipe is 50000-450000 m ³ The pipe diameters of the main air inlet pipes are 1200-3000 mm, the number of the branch air inlet pipes is at least four, and the pipe diameters of the branch air inlet pipes are 700-1500 mm.

Furthermore, the top of the air inlet main pipe is provided with a pressure relief assembly, and the pressure relief assembly comprises a first pipe body and a first valve; and/or, the bottom that the inlet main was responsible for is equipped with hydrops and discharges the subassembly, hydrops discharges the subassembly and includes second body and second valve.

In a second aspect, an object of the present invention is to provide an air inlet structure, which prevents the liquid seal liquid in the air inlet branch pipe from flowing into the air inlet main pipe during regeneration on the basis of solving the technical problems of difficult selection, installation and maintenance of the valve in the existing cutoff mode.

In order to realize the purpose of the above-mentioned second aspect, the utility model provides a second kind of air inlet structure, technical scheme is as follows:

the gas inlet structure is used for inputting gas to be desulfurized into a desulfurization reactor filled with a desulfurization catalyst in the catalytic flue gas desulfurization device, and comprises a gas inlet main pipe and gas inlet branch pipes, and the number of the gas inlet branch pipes is matched with that of the desulfurization reactor; the air inlet branch pipe is provided with a descending section and an ascending section which are sequentially arranged between the air inlet main pipe and the air inlet of the desulfurization reactor, and the input end of the descending section is higher than the output end of the ascending section.

Furthermore, a liquid inlet and a liquid outlet are arranged on the pipe body of the air inlet branch pipe; and/or the air inlet branch pipe is U-shaped.

Further, the liquid outlet is communicated with the regeneration liquid tank, preferably, the regeneration liquid tank is at least two, the concentration of the sulfuric acid changes in a gradient manner, and the liquid seal liquid in the air inlet branch pipe is discharged into the regeneration liquid tank with the lowest concentration of the sulfuric acid.

Further, the air inlet branch pipe comprises a first horizontal pipe, a first bent pipe, a first vertical pipe, a second bent pipe, a second horizontal pipe, a third bent pipe, a second vertical pipe, a fourth bent pipe and a third horizontal pipe which are connected in sequence; the liquid inlet is preferably arranged on the first vertical pipe; the liquid outlet is preferably arranged on the second horizontal pipe.

Further, the length of the first vertical pipe is 1400-1800 mm; the length of the second vertical pipe is 400-600 mm.

Third aspect, an object of the utility model is to provide an inlet structure, on the basis of solving the selection type that the valve exists among the current cutting mode, installation and the technical problem of maintenance difficulty, prevent that regeneration acidizing fluid from flowing into air intake branch and causing air intake branch exit end to corrode.

In order to achieve the purpose of the third aspect, the present invention provides a third air intake structure, which comprises:

the gas inlet structure is used for inputting gas to be desulfurized into a desulfurization reactor filled with a desulfurization catalyst in the catalytic flue gas desulfurization device, and comprises a gas inlet main pipe and gas inlet branch pipes, and the number of the gas inlet branch pipes is matched with that of the desulfurization reactor; the gas inlet branch pipe is provided with a descending section and an ascending section which are sequentially arranged between the gas inlet main pipe and the gas inlet of the desulfurization reactor; the air inlet structure also comprises a protective component for preventing the regenerated acid liquid generated during the regeneration of the desulfurization catalyst from flowing into the air inlet branch pipe.

Furthermore, the protection component comprises a baffle plate arranged above the air inlet of the desulfurization reactor, and the width of the baffle plate is larger than the diameter of the air inlet.

Furthermore, the length of the baffle along the axial direction of the air inlet is 400-600 mm, and two sides of the baffle exceed the radial direction of the air inlet by 30-100 mm.

Furthermore, the protection component comprises an extension pipe connected with an air inlet of the desulfurization reactor, and an included angle between the outlet end face of the extension pipe and the horizontal plane is an acute angle.

Furthermore, the included angle between the outlet end surface of the extension pipe and the horizontal plane is 30-60 degrees; and/or the length of the upper side of the extension pipe is 400-600 mm.

Furthermore, the air inlet branch pipe comprises a first horizontal pipe, a first bent pipe, a first vertical pipe, a second bent pipe, a second horizontal pipe, a third bent pipe, a second vertical pipe, a fourth bent pipe and a third horizontal pipe which are connected in sequence.

Further, the liquid inlet is arranged on the first vertical pipe; the liquid outlet is arranged on the second horizontal pipe.

Furthermore, the top of the air inlet main pipe is provided with a pressure relief assembly, and the pressure relief assembly comprises a first pipe body and a first valve; and/or, the bottom that the inlet main pipe is equipped with hydrops and discharges the subassembly, hydrops discharges the subassembly and includes second body and second valve.

In a fourth aspect, an object of the present invention is to provide an air inlet structure, which simplifies the usage of the air inlet branch as a liquid seal on the basis of the technical problems of difficult selection, installation and maintenance of the valve in the existing cutoff mode.

In order to realize the purpose of the above fourth aspect, the utility model provides a fourth kind structure of admitting air, technical scheme is as follows:

the gas inlet structure is used for inputting gas to be desulfurized into a desulfurization reactor filled with a desulfurization catalyst in the catalytic flue gas desulfurization device, and comprises a gas inlet main pipe and gas inlet branch pipes, and the number of the gas inlet branch pipes is matched with that of the desulfurization reactor; the gas inlet branch pipe is provided with a descending section and an ascending section which are sequentially arranged between the gas inlet main pipe and the desulfurization reactor; a liquid inlet and a liquid outlet are arranged on the pipe body of the air inlet branch pipe; the air intake structure further includes: the liquid conveying component is used for inputting liquid into the corresponding gas inlet branch pipe for liquid sealing when the desulfurization catalyst in the desulfurization reactor is regenerated; and the liquid drainage assembly is used for draining the liquid seal liquid in the air inlet branch pipe after the regeneration of the desulfurization catalyst is finished.

Furthermore, the desulfurization device is provided with two rows of desulfurization reactors which are arranged at intervals, and the main gas inlet pipe is arranged between the two rows of desulfurization reactors; and/or the input end of the falling segment is higher than the output end of the rising segment.

Furthermore, the desulfurization device is provided with at least two rows of desulfurization reactors which are arranged at intervals, and a regeneration liquid tank is arranged below the two desulfurization reactors at the bottom layer; and/or the main air inlet pipe and the branch air inlet pipe are arranged outside the two rows of desulfurization reactors.

Further, the infusion set comprises: the supporting plate is bridged between the two desulfurization reactors positioned at the top layer; a water tank mounted on the support plate; the first infusion tube is connected with the water tank and the liquid inlet; alternatively, the infusion set comprises: the second liquid conveying pipe is connected with the clear water liquid tank and the liquid inlet; and a water pump that inputs water for regeneration of the desulfurization catalyst into the intake manifold.

Further, the liquid discharge assembly comprises a liquid discharge pipe, and the liquid discharge pipe is connected with the liquid discharge port and the regeneration liquid tank.

Furthermore, the air inlet structure also comprises a control structure for controlling the input amount of the liquid seal liquid in the air inlet branch pipe; the control structure includes: a first detector for detecting the flow rate or pressure of the gas to be desulfurized; the second detector is used for detecting the liquid seal liquid level height in the air inlet branch pipe; and the controller is used for controlling the start and stop of the infusion assembly according to the detection results of the first detector and the second detector.

Further, the intake branch pipe is U-shaped.

The inlet branch pipe comprises a first horizontal pipe, a first bent pipe, a first vertical pipe, a second bent pipe, a second horizontal pipe, a third bent pipe, a second vertical pipe, a fourth bent pipe and a third horizontal pipe which are connected in sequence, and the liquid inlet is formed in the first vertical pipe; the liquid outlet is arranged on the second horizontal pipe.

Foretell four kinds of inlet structure homoenergetic when desulfurization reactor is desulfurization are responsible for the inlet air treat that desulfurization gas inputs to desulfurization reactor in, simultaneously, when desulfurization reactor sprays regeneration, can cut off the inflow of treating desulfurization gas through the mode of liquid seal, and not only the gas tightness is showing and is promoting, avoids the installation and the maintenance of valve moreover, and it is more convenient to use. On this basis, the input of descending section is higher than the output of ascending section in the inlet branch pipe of second kind air inlet structure, can effectively avoid the liquid seal liquid in the inlet branch pipe to flow into under the pressure and admit air and be responsible for the back and cause the influence to the desulfurization process. The third air inlet structure is provided with a protective component for preventing the regenerated acid liquid generated during the regeneration of the desulfurization catalyst from flowing into the air inlet branch pipe, and the outlet end of the air inlet branch pipe can be effectively prevented from being corroded by the regenerated acid liquid generated by spraying. The fourth air inlet structure is provided with a liquid conveying assembly and a liquid discharging assembly, and is convenient for quickly establishing and removing the liquid seal function of the air inlet branch pipe.

In a fifth aspect, the present invention is directed to provide a humidifying structure to solve the technical problem that the mixing effect and the corrosion prevention effect are difficult to be considered in the existing humidifying method.

In order to achieve the above-mentioned object of the fifth aspect, the present invention provides a humidifying structure, which comprises the following technical solutions:

humidification structure for treat in the catalytic process flue gas desulfurization device that the desulfurization gas gets into before filling the desulfurization reactor who treats the desulfurization catalyst and input steam in the main pipe of admitting air of carrying the gas of treating the desulfurization, the humidification structure includes: a steam delivery conduit for receiving and delivering steam; the at least two humidifying pipelines penetrate through the pipe wall of the main air inlet pipe and are arranged at intervals in the radial direction or the axial direction of the main air inlet pipe; and the air outlet holes are arranged on the humidifying pipeline extending into the air inlet main pipe at intervals, and the opening direction of the air outlet holes is not opposite to the flowing direction of the gas to be desulfurized.

Furthermore, the main gas inlet pipe is provided with a horizontal section and a vertical section, the humidifying pipeline is connected with the horizontal section, and the vertical section is provided with a plurality of gas inlet branch pipes connected with the desulfurization reactor in parallel; the distance between the humidifying pipeline and the turning part of the main gas inlet pipe is preferably 5000-8000 mm.

Further, the opening of the air outlet hole faces to the flowing direction of the gas to be desulfurized.

Furthermore, the length of the humidifying pipeline extending into the air inlet main pipe is at least 0.4 times of the diameter of the air inlet main pipe; and/or the distance between the tail end of the humidifying pipeline and the pipe wall of the main air inlet pipe is more than or equal to 50mm.

Further, the flow rate of the gas to be desulfurized in the main gas inlet pipe is 20000 to 450000m ³ The pipe diameter of the air inlet main pipe is 500-3000 mm, the flow rate of the water vapor in the steam delivery pipeline is 0.15-6 t/h, the arrangement interval of the humidifying pipelines is 300-500 mm, the pipe diameter of the humidifying pipelines is 80-150 mm, the aperture of the air outlet is 40-60 mm, and the arrangement interval of the air outlet is 100-300 mm.

Furthermore, when the humidifying pipelines are arranged at intervals in the radial direction of the air inlet main pipe, the aperture of the outer air outlet is larger than that of the inner air outlet; when the humidifying pipelines are arranged at intervals in the axial direction of the air inlet main pipe, the aperture of the air outlet hole at the front end is larger than that of the air outlet hole at the rear end.

Furthermore, the humidifying structure also comprises a guide pipe, the guide pipe is arranged on a through hole preset on the air inlet main pipe, and the humidifying pipeline is detachably connected with the guide pipe; and/or the humidifying pipeline is detachably connected with the steam delivery pipeline.

Further, the humidifying structure also comprises a drainage component, wherein the drainage component comprises a drainage pipe, and the drainage pipe is connected with the steam delivery pipeline and the regeneration liquid tank; preferably, the number of the regeneration liquid tanks is at least two, the concentration of the sulfuric acid is changed in a gradient manner, and the liquid in the air inlet branch pipe is discharged into the regeneration liquid tank with the lowest concentration of the sulfuric acid.

In the humidifying structure, the humidifying pipelines penetrate through the pipe wall of the main air inlet pipe and are arranged at intervals in the radial direction or the axial direction of the main air inlet pipe, so that the mixing effect of the water vapor and the flue gas to be desulfurized can be obviously improved; meanwhile, the opening direction of the air outlet is not opposite to the flowing direction of the gas to be desulfurized, so that a small amount of sulfuric acid generated by mixing the water vapor and the flue gas to be desulfurized is not easy to attach to the humidifying pipeline, and the corrosion speed of the humidifying pipeline is effectively relieved.

In a sixth aspect, an object of the present invention is to provide a spray structure to solve the technical problem that the spray pipeline is difficult to install, overhaul and change in the existing regeneration mode.

In order to realize the purpose of above-mentioned sixth aspect, the utility model provides a first kind sprays structure, technical scheme as follows:

the spraying structure is used for spraying and regenerating a desulfurization reactor filled with a desulfurization catalyst in the catalytic flue gas desulfurization device and comprises spraying pipes and spray heads, and the number of the spraying pipes is matched with that of the desulfurization reactor; the spray pipe is arranged on the outer side of the top wall of the desulfurization reactor, and the spray head is arranged on the inner side of the top wall of the desulfurization reactor; the shower includes: the liquid inlet main pipe is used for conveying spraying liquid; the liquid inlet branch pipes are at least two, and the at least two liquid inlet branch pipes are arranged at the output end of the liquid inlet main pipe in parallel; each liquid inlet branch pipe is provided with at least two spraying mechanisms which are arranged in parallel, and the output ends of the spraying mechanisms are connected with the spray head; wherein, each desulfurization reactor is provided with a plurality of rows of nozzles which are arranged at intervals and are symmetrically arranged by the center of the desulfurization reactor.

Furthermore, when the cross section of the desulfurization reactor is circular, two liquid inlet branch pipes are arranged and are axially symmetrically distributed by taking the center of the desulfurization reactor; each liquid inlet branch pipe is provided with a transverse pipe and a longitudinal pipe, the input ends of the two longitudinal pipes are connected with the liquid inlet main pipe, and the two transverse pipes are arranged in parallel; the spraying mechanism is provided with a spraying branch pipe which is connected with the liquid inlet branch pipe and the spray head.

Furthermore, in the direction parallel to the installation direction of the transverse pipe, two rows of spray heads close to the center of the desulfurization reactor are distributed in a centrosymmetric manner by the center of the desulfurization reactor, and the rest spray heads are distributed in an axisymmetric manner; preferably, at least two rows of spray heads are arranged on two sides of each transverse pipe; in the direction parallel to the installation direction of the longitudinal pipes, two rows of spray heads far away from the center of the desulfurization reactor are distributed in a centrosymmetric manner by taking the center of the desulfurization reactor as a center, and the rest spray heads are distributed in an axisymmetric manner; it is preferable that a plurality of rows of the shower heads parallel to the installation direction of the longitudinal pipes are arranged at equal intervals.

When the cross section of the desulfurization reactor is rectangular, the number of the liquid inlet branch pipes is three and is parallel to the side edge of the desulfurization reactor; the spraying mechanism is provided with a spraying main pipe and a spraying branch pipe which are connected with the liquid inlet branch pipe and the spray head, each liquid inlet branch pipe is provided with at least two spraying main pipes which are arranged in parallel, and each spraying main pipe is provided with at least two spraying branch pipes which are arranged in parallel; the spray heads parallel to and perpendicular to the installation direction of the liquid inlet branch pipe are distributed in axial symmetry with the center of the desulfurization reactor.

Furthermore, in the direction parallel to the installation direction of the liquid inlet branch pipes, one side of each liquid inlet branch pipe is provided with two rows of spray heads; and/or a plurality of rows of spray heads parallel to the installation direction of the liquid inlet branch pipe are arranged at equal intervals.

Furthermore, each spraying main pipe is provided with two or four spraying branch pipes, and the pipe diameter of the spraying main pipe provided with the four spraying branch pipes is larger than that of the spraying main pipe provided with the two spraying branch pipes.

Furthermore, the spraying structure also comprises a liquid inlet main pipe, and the spraying pipes matched with the desulfurization reactor in number are connected in parallel and then connected with the liquid inlet main pipe; and/or the liquid inlet main pipe is arranged at the edge of the desulfurization reactor far away from the center.

Furthermore, the spray pipe is arranged at the top of the desulfurization reactor, the top of the desulfurization reactor is provided with a gas outlet and a manhole, and the center distance between the spray head and the gas outlet and/or the center distance between the manhole are/is not less than 150mm.

In a seventh aspect, the present invention is directed to a spraying structure to solve the technical problem that the spraying pipeline and the nozzle are not easy to be installed, maintained and replaced in the existing regeneration mode.

In order to realize the purpose of the above seventh aspect, the utility model provides a second sprays structure, technical scheme as follows:

the spraying structure is used for spraying and regenerating a desulfurization reactor filled with a desulfurization catalyst in the catalytic flue gas desulfurization device and comprises spraying pipes and spray heads, and the number of the spraying pipes is matched with that of the desulfurization reactor; the spray pipe is arranged on the outer side of the top wall of the desulfurization reactor, and the spray head is arranged on the inner side of the top wall of the desulfurization reactor; the spray structure is shower nozzle installation component still, and shower nozzle installation component includes: the horizontal pipe body is detachably connected with the output end of the spray pipe; one end of the vertical pipe body is connected with the horizontal pipe body, and the other end of the vertical pipe body is connected with the spray head and extends to the upper part of the desulfurization catalyst after penetrating through a through hole reserved at the top of the desulfurization reactor; the embedded pipe is installed on the through hole, and the vertical pipe body is detachably connected with the embedded pipe.

Furthermore, the horizontal pipe body is connected with the spray pipe through a first flange; and/or the vertical pipe body is connected with the embedded pipe through a second flange.

Furthermore, the horizontal distance between the first flange and the second flange is 100-1000 mm.

Further, the distance between the horizontal pipe body and the top of the desulfurization reactor is 300-1200 mm.

Further, the height of the embedded pipe is 50-300 mm.

Further, the nozzle mounting assembly further comprises an elbow pipe body connecting the horizontal pipe body and the vertical pipe body.

Further, the shower includes: the liquid inlet main pipe is used for conveying spraying liquid; the liquid inlet branch pipes are at least two, and the at least two liquid inlet branch pipes are arranged at the output end of the liquid inlet main pipe in parallel; each liquid inlet branch pipe is provided with at least two spraying mechanisms which are arranged in parallel, and the output ends of the spraying mechanisms are connected with the horizontal pipe body; wherein, each desulfurization reactor is provided with a plurality of rows of nozzles which are arranged at intervals and are symmetrically arranged by the center of the desulfurization reactor.

Furthermore, when the cross section of the desulfurization reactor is circular, two liquid inlet branch pipes are arranged and are axially symmetrically distributed by taking the center of the desulfurization reactor; each liquid inlet branch pipe is provided with a transverse pipe and a longitudinal pipe, the input ends of the two longitudinal pipes are connected with the liquid inlet main pipe, and the two transverse pipes are arranged in parallel; the spraying mechanism is provided with a spraying branch pipe which is connected with the liquid inlet branch pipe and the horizontal pipe body; when the cross section of the desulfurization reactor is rectangular, the number of the liquid inlet branch pipes is three and is parallel to the side edge of the desulfurization reactor; the spraying mechanism is provided with a spraying main pipe and a spraying branch pipe which are connected with the liquid inlet branch pipe and the horizontal pipe body, each liquid inlet branch pipe is provided with at least two spraying main pipes which are arranged in parallel, and each spraying main pipe is provided with at least two spraying branch pipes which are arranged in parallel.

Furthermore, the spraying structure also comprises a liquid inlet main pipe, and the spraying pipes matched with the desulfurization reactor in number are connected in parallel and then are connected with the liquid inlet main pipe; and/or the liquid inlet main pipe is arranged at the edge of the desulfurization reactor far away from the center.

In an eighth aspect, an object of the utility model is to provide a spray structure to solve in the current regeneration mode spray line and shower nozzle difficult installation, maintenance and change and the fragile technical problem of shower nozzle.

In order to realize the purpose of above-mentioned eighth aspect, the utility model provides a third sprays structure, technical scheme as follows:

the spraying structure is used for spraying and regenerating a desulfurization reactor filled with a desulfurization catalyst in the catalytic flue gas desulfurization device and comprises spraying pipes and spray heads, and the number of the spraying pipes is matched with that of the desulfurization reactor; the spray pipe is arranged on the outer side of the top wall of the desulfurization reactor, and the spray head is arranged on the inner side of the top wall of the desulfurization reactor; the spray structure also comprises a spray head mounting component, and the spray head mounting component comprises a mounting pipe; one end of the mounting pipe is detachably connected with the output end of the spray pipe, and the other end of the mounting pipe is connected with the spray head and extends into the upper part of the desulfurization catalyst after penetrating through the through hole at the top of the desulfurization reactor; wherein, the installation pipe adopts the PP pipe, and the shower nozzle adopts the PP shower nozzle.

Furthermore, the material of the spray pipe is glass fiber reinforced plastic; and/or the spray head is a spiral spray head.

Furthermore, the spray nozzle mounting assembly further comprises a pre-buried pipe, the pre-buried pipe is connected with a through hole reserved in the top of the desulfurization reactor, and the mounting pipe is detachably connected with the pre-buried pipe.

Further, the installation tube includes: the horizontal pipe body is detachably connected with the output end of the spray pipe; one end of the vertical pipe body is connected with the horizontal pipe body, and the other end of the vertical pipe body is connected with the spray head; the vertical pipe body is detachably connected with the embedded pipe.

Further, the horizontal pipe body is connected with the spray pipe through a first flange; and/or the vertical pipe body is connected with the embedded pipe through a second flange.

Further, the distance between the horizontal pipe body and the top of the desulfurization reactor is 300-1200 mm; the height of the embedded pipe is 50-300 mm; the installation pipe also comprises a bent pipe body connected with the horizontal pipe body and the vertical pipe body.

Further, the shower includes: the liquid inlet main pipe is used for conveying spraying liquid and is arranged at the edge of the desulfurization reactor far away from the center; the liquid inlet branch pipes are at least two, and the at least two liquid inlet branch pipes are arranged at the output end of the liquid inlet main pipe in parallel; each liquid inlet branch pipe is provided with at least two spraying mechanisms which are arranged in parallel, and the output ends of the spraying mechanisms are connected with the mounting pipe; wherein, each desulfurization reactor is provided with a plurality of rows of nozzles which are arranged at intervals and are symmetrically arranged by the center of the desulfurization reactor.

Furthermore, when the cross section of the desulfurization reactor is circular, two liquid inlet branch pipes are arranged and are axially symmetrically distributed by taking the center of the desulfurization reactor; each liquid inlet branch pipe is provided with a transverse pipe and a longitudinal pipe, the input ends of the two longitudinal pipes are connected with the liquid inlet main pipe, and the two transverse pipes are arranged in parallel; the spraying mechanism is provided with a spraying branch pipe which is connected with the liquid inlet branch pipe and the mounting pipe; when the cross section of the desulfurization reactor is rectangular, the number of the liquid inlet branch pipes is three and is parallel to the side edge of the desulfurization reactor; the spraying mechanism is provided with a spraying main pipe and a spraying branch pipe which are connected with the liquid inlet branch pipe and the installation pipe, each liquid inlet branch pipe is provided with at least two spraying main pipes which are arranged in parallel, and each spraying main pipe is provided with at least two spraying branch pipes which are arranged in parallel.

Further, the mounting tube is bonded to the nozzle.

In the above three kinds of spray structures, since the spray pipes are arranged outside the top wall of the desulfurization reactor and the spray heads are arranged inside the top wall of the desulfurization reactor, the arrangement, installation and maintenance of the spray pipes are facilitated. In the first kind sprays the structure, the shower adopts feed liquor main pipe, feed liquor branch pipe and sprays the central symmetry arrangement that the mechanism made the shower nozzle with desulfurization reactor, not only is showing to promote and sprays the homogeneity, is showing moreover and has simplified the spray line and arrange. In the second kind sprays the structure, horizontal body can be dismantled with the output of shower and be connected and vertical body can dismantle with pre-buried pipe and be connected, not only can install the shower nozzle fast, can change the shower nozzle of damage moreover alone, reduces the operation cost. In the third kind sprays the structure, adopt installation pipe and the shower nozzle of PP (polypropylene) material, striking damage when preventing that installation pipe and shower nozzle from inserting the through-hole at desulfurization reactor top, life is longer.

In a ninth aspect, the present invention provides an application of the above air intake structure, humidifying structure and spraying structure.

In order to realize the purpose of the above ninth aspect, the utility model firstly provides a catalytic flue gas desulfurization device, the technical scheme is as follows:

the catalytic flue gas desulfurization device is provided with at least two desulfurization reactors which are arranged in parallel, and desulfurization catalysts are filled in the desulfurization reactors; the air inlet structure is any one of the air inlet structure in the first aspect to the fourth aspect, the humidifying structure is the humidifying structure in the fifth aspect, and the spraying structure is any one of the spraying structure in the sixth aspect to the eighth aspect.

In order to achieve the above-mentioned object of the ninth aspect, the present invention secondly provides a desulfurization method, the technical solution is as follows:

the desulfurization method adopts the catalytic flue gas desulfurization device to treat the gas to be desulfurized.

The present invention will be further described with reference to the accompanying drawings and the detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which form a part of the disclosure, are included to assist in understanding the disclosure, and the description provided herein and the accompanying drawings, which are related thereto, are intended to explain the disclosure, but do not constitute an undue limitation on the disclosure. In the drawings:

fig. 1 is a schematic structural view of a first embodiment of the air intake structure of the present invention.

Fig. 2 is a front view of an intake manifold in a first embodiment of the intake structure of the present invention.

Fig. 3 is a front view of an intake manifold in a second embodiment of the intake structure of the present invention.

Fig. 4 is a schematic structural view of a third embodiment of the air intake structure of the present invention.

Fig. 5 is a front view of an intake manifold in a third embodiment of the intake structure of the present invention.

Fig. 6 is a side view of an embodiment of a shield assembly in a fourth embodiment of an air intake structure of the present invention.

Fig. 7 is a side view of another embodiment of a shield assembly in a fourth embodiment of an air intake structure of the present invention.

Fig. 8 is a schematic structural view of a fifth embodiment of the air intake structure of the present invention.

Fig. 9 is a schematic view of a first embodiment of the humidifying structure of the present invention.

Fig. 10 is a cross-sectional view of a first embodiment of a humidifying structure of the present invention.

Figure 11 is a PID diagram of a first embodiment of a humidification structure of the present invention.

Fig. 12 is a schematic structural view of a second embodiment of the humidifying structure of the present invention.

Fig. 13 is a schematic structural view of a third embodiment of the humidifying structure of the present invention.

Fig. 14 is a top view of a first embodiment of the spray structure of the present invention.

Fig. 15 is a top view of a second embodiment of the spray structure of the present invention.

Fig. 16 is a front view of a first embodiment and a second embodiment of the spray structure of the present invention.

Fig. 17 is a schematic structural view of a third embodiment of the spraying structure of the present invention.

The relevant references in the above figures are:

100-a desulfurization reactor, 110-a desulfurization catalyst, 120-an air outlet, 130-a manhole, 200-a main air inlet pipe, 211-a first pipe body, 212-a first valve, 221-a second pipe body, 222-a second valve, 231-a vertical section, 232-a horizontal section, 300-a branch air inlet pipe, 311-a first horizontal pipe, 312-a first bent pipe, 313-a first vertical pipe, 314-a second bent pipe, 315-a second horizontal pipe, 316-a third bent pipe, 317-a second vertical pipe, 318-a fourth bent pipe, 319-a third horizontal pipe, 320-an liquid inlet, 330-a liquid outlet, 340-an overflow outlet, 351-a baffle and 352-an extension pipe, 410-water tank, 420-clear water tank, 430-regeneration tank, 440-product recovery tank, 510-steam delivery pipeline, 520-humidification pipeline, 530-gas outlet, 540-guide pipe, 551-stop valve, 552-vortex flowmeter, 553-drain valve, 600-spray pipe, 610-main liquid inlet pipe, 620-branch liquid inlet pipe, 621-longitudinal pipe, 622-transverse pipe, 630-branch spray pipe, 640-main spray pipe, 650-main liquid inlet pipe, 710-installation pipe, 711-horizontal pipe, 712-vertical pipe, 713-elbow pipe, 720-spray head, 730-pre-buried pipe, 741-first flange and 742-second flange.

Detailed Description

The present invention will be described more fully with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before the present invention is described with reference to the accompanying drawings, it is to be noted that:

the technical solutions and features provided in the present invention in each part including the following description may be combined with each other without conflict.

Moreover, references to embodiments of the invention in the following description are generally only to be considered as examples of the invention, and not as all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention shall fall within the protection scope of the present invention.

With respect to the terms and units of the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.

Fig. 1 is a schematic structural view of a first embodiment of the air intake structure of the present invention. Fig. 2 is a front view of an intake manifold in a first embodiment of the intake structure of the present invention.

As shown in fig. 1-2, the gas inlet structure of the present embodiment is used for inputting a gas to be desulfurized into a desulfurization reactor 100 filled with a desulfurization catalyst 110 in a catalytic flue gas desulfurization device, and comprises a main gas inlet pipe 200 and a branch gas inlet pipe 300, wherein the number of the branch gas inlet pipes 300 is adapted to that of the desulfurization reactor 100; wherein the inlet manifold 300 has a descending section and an ascending section sequentially disposed between the inlet main pipe 200 and the inlet of the desulfurization reactor 100; the inlet manifold 300 has an inlet port 320 and an outlet port 330.

Thus, when the desulfurization catalyst 110 is regenerated, the liquid flowing into the intake manifold 300 from the liquid inlet 320 liquid-seals the intake manifold 300; after the regeneration of the desulfurization catalyst 110 is completed, the liquid seal liquid in the intake manifold 300 is discharged from the liquid discharge port 330.

The desulfurization device is provided with two rows of desulfurization reactors 100 which are arranged at intervals and at least two rows of desulfurization reactors 100 which are arranged at intervals, a regeneration liquid tank 430 is arranged below the two desulfurization reactors 100 at the bottom layer, and the main air inlet pipe 200 and the branch air inlet pipe 300 are arranged at the outer sides of the two rows of desulfurization reactors 100. Therefore, the installation of the air inlet structure is convenient, and the occupied area of the desulfurization device is saved.

The intake manifold 300 is U-shaped, and thus has a descending section and an ascending section, and has few dead angles, thereby preventing scaling. For convenience of manufacturing, handling and installation, the air inlet branch pipe 300 specifically includes a first horizontal pipe 311, a first elbow 312, a first vertical pipe 313, a second elbow 314, a second horizontal pipe 315, a third elbow 316, a second vertical pipe 317, a fourth elbow 318 and a third horizontal pipe 319 connected in sequence, wherein the first elbow 312, the second elbow 314, the third elbow 316 and the fourth elbow 318 are preferably the same size.

The liquid inlet 320 is provided on the first vertical pipe 313 and helps to prevent the liquid seal liquid from flowing into the main gas inlet pipe 200. The liquid inlet 320 is located inside the first vertical pipe 313 to facilitate pipeline arrangement.

The height difference D1 between the top of the liquid inlet 320 and the bottom of the first horizontal pipe 311 is more than or equal to 400mm, and the height difference D2 between the bottom of the liquid inlet 320 and the liquid level of the liquid seal is more than or equal to 130mm, so that the liquid seal liquid is not easy to flow back to the liquid inlet 320 and the main gas inlet pipe 200.

The lengths of the first vertical pipe and the second vertical pipe are 600-800 mm, so that a strong liquid sealing effect can be ensured, and liquid sealing liquid is not easy to flow into the air inlet main pipe 200.

The drain port 330 is provided in the second horizontal pipe 315, thereby facilitating the draining of the liquid seal liquid. The liquid outlet 330 is communicated with the regeneration liquid tank 430, and thus, a small amount of sulfuric acid can be recovered.

The length D3 of the second horizontal pipe 315 is 200-400 mm, and the distance between the top of the second horizontal pipe 315 and the liquid seal level is more than or equal to 350mm, so that the liquid seal liquid has enough filling space to ensure the liquid seal effect.

The flow rate of the gas to be desulfurized in the main gas inlet pipe 200 is 50000-450000 m ³ The pipe diameters of the main air inlet pipe are 1200-3000 mm, the number of the branch air inlet pipes is at least four, and the pipe diameters of the branch air inlet pipes are 700-1500 mm, so that the method can meet various application scenes with different treatment amounts of gas to be desulfurized in the prior art.

Optionally, the top of the main gas inlet pipe 200 is provided with a pressure relief assembly, which preferably comprises a first pipe 211 and a first valve 212, and the first valve 212 is a ball valve, so that the pressure in the pipe can be reduced by the pressure relief assembly, and the liquid sealing liquid is prevented from being pressed into the desulfurization reactor 100. Preferably, the pressure relief assembly is connected with the gas collecting device, so that a small amount of gas exhausted from the pressure relief assembly is concentrated and then treated.

The effusion discharging assembly is preferably arranged at the bottom of the main gas inlet pipe 200, and preferably comprises a second pipe body 221 and a second valve 222, wherein the second valve 222 is a water discharge valve, and the second pipe body 221 is connected with the main gas inlet pipe 200 and the regeneration liquid tank 430, so that effusion is prevented from corroding the main gas inlet pipe 200.

As shown in fig. 3, the air intake structure of the present embodiment further has the following arrangement on the basis of the first embodiment: the pipe body of the inlet manifold 300 is further provided with an overflow port 340, so that when the inlet pressure is high and the liquid-sealed liquid moves towards the inlet of the desulfurization reactor 100, the liquid-sealed liquid can be prevented from flowing into the desulfurization reactor 100.

The overflow outlet 340 is disposed at the lower side of the fourth bend 318, so that the overflow effect is ensured, and the liquid sealing effect is not affected. The overflow port 340 is communicated with the regeneration liquid tank 430, and thereby, a small amount of sulfuric acid can be recovered.

Fig. 4 is a schematic structural view of a third embodiment of the air intake structure of the present invention. Fig. 5 is a front view of an intake manifold in a third embodiment of the intake structure of the present invention.

As shown in fig. 4 to 5, the air intake structure of the present embodiment further has the following arrangement on the basis of the first embodiment: the input end of the descending section of the air inlet branch pipe 300 is higher than the output end of the ascending section, so that the influence of the liquid seal liquid in the air inlet branch pipe 300 flowing into the air inlet main pipe 200 under the pressure on the desulfurization process of other desulfurization reactors 100 can be effectively avoided.

The length D4 of the first vertical pipe 313 is 1400-1800 mm, and the length D5 of the second vertical pipe 317 is 400-600 mm; compared to the first embodiment: the first vertical pipe 313 of the present embodiment has a longer length, which facilitates the liquid inlet 320, and liquid seal liquid is not easy to flow into the main gas inlet pipe 200 and the liquid inlet 320; moreover, the purpose of making the input end of the descending section of the air inlet branch pipe 300 higher than the output end of the ascending section is achieved by making the length of the first vertical pipe 313 greater than that of the second vertical pipe 317, so that the liquid seal liquid is further prevented from flowing into the air inlet main pipe 200 and the liquid inlet 320, and the air inlet branch pipe 300 is more convenient to machine, manufacture, handle and install.

On the basis of the third embodiment, the air intake structure of the fourth embodiment further has the following arrangement: the air intake structure further includes a protection component for preventing the regenerated acid solution generated when the desulfurization catalyst 110 is regenerated from flowing into the air intake branch pipe 300, thereby effectively preventing the outlet end of the air intake branch pipe 300 from being corroded by the regenerated acid solution generated by spraying.

Fig. 6 is a side view of an embodiment of a shield assembly in a fourth embodiment of the air intake structure of the present invention.

As shown in fig. 6, the shielding assembly includes a baffle 351 disposed above the air inlet of the desulfurization reactor 100, and the width of the baffle 351 is greater than the diameter of the air inlet. When the length D6 of the baffle 351 along the axial direction of the air inlet is 400-600 mm and the width of the baffle 351 meets the condition that the two sides of the baffle 351 exceed the radial direction of the air inlet by 30-100 mm, the influence on the uniform diffusion of the gas to be desulfurized in the desulfurization reactor 100 is small, and the regenerated acid liquid can be effectively isolated from the outlet end of the air inlet branch pipe 300.

As shown in fig. 7, the protection assembly includes an extension pipe 352 connected to the gas inlet of the desulfurization reactor 100, and an outlet end surface of the extension pipe 352 forms an acute angle with the horizontal plane. When the angle θ between the outlet end surface of the extension pipe 352 and the horizontal plane is 30 to 60 °, and the length D7 of the upper side of the extension pipe 352 is 400 to 600mm, the influence of the uniform diffusion of the gas to be desulfurized in the desulfurization reactor 100 is small, and the regenerated acid solution is not likely to flow into the extension pipe 352.

As shown in fig. 8, the air intake structure of the present embodiment further has the following arrangement on the basis of the third embodiment: the air inlet structure further comprises an infusion assembly for inputting liquid into the corresponding air inlet branch pipe 300 for liquid sealing when the desulfurization catalyst 110 in the desulfurization reactor 100 is regenerated, and a liquid discharge assembly for discharging the liquid sealed in the air inlet branch pipe 300 after the desulfurization catalyst 110 is regenerated.

One embodiment of the liquid conveying assembly comprises a supporting plate, a water tank 410 and a first liquid conveying pipe, wherein the supporting plate is bridged between the two desulfurization reactors 100 positioned at the top layer, the water tank 410 is installed on the supporting plate, and the first liquid conveying pipe is connected with the water tank 410 and the liquid inlet 320, so that the liquid sealing liquid automatically flows into the air inlet branch pipe 300 by adopting the water tank 410 arranged at a high position, and the occupied area can be remarkably saved.

Another embodiment of the liquid conveying component comprises a second liquid conveying pipe and a water pump, wherein the second liquid conveying pipe is connected with the clean water liquid tank 420 and the liquid inlet 320, and the water pump inputs the regeneration water of the desulfurization catalyst 110 into the air inlet branch pipe 300, so that the existing spraying supporting facilities are utilized, and the equipment investment cost is saved.

The drain assembly includes a drain tube that connects the drain port 330 and the regeneration tank 430.

In order to automatically control the input amount of the liquid seal liquid in the air inlet branch pipe 300 according to the air inlet pressure, the air inlet structure further comprises a control structure, the control structure comprises a first detector, a second detector and a controller, the first detector is used for detecting the flow or the pressure of the gas to be desulfurized, the second detector is used for detecting the liquid seal liquid level height in the air inlet branch pipe 300, and the controller is used for controlling the start and stop of the liquid conveying assembly according to the detection results of the first detector and the second detector.

Fig. 9 is a schematic view of a first embodiment of the humidifying structure of the present invention. Fig. 10 is a cross-sectional view of a first embodiment of the humidifying structure of the present invention. Figure 11 is a PID diagram of a first embodiment of a humidification structure of the present invention.

As shown in fig. 9-11, the humidifying structures of the present embodiment are all used for inputting water vapor into the main gas inlet pipe 200 for conveying the gas to be desulfurized before the gas to be desulfurized enters the desulfurization reactor 100 filled with the desulfurization catalyst 110 in the catalytic flue gas desulfurization device; the humidification structure comprises a vapor delivery conduit 510, a humidification conduit 520, and an air outlet 530; the steam delivery pipe 510 is used for receiving and delivering water vapor; the number of the humidifying pipelines 520 is at least two, the humidifying pipelines are arranged at the output end of the steam conveying pipeline 510 in parallel, and the at least two humidifying pipelines 520 penetrate through the pipe wall of the main air inlet pipe 200 and are arranged at intervals in the axial direction of the main air inlet pipe 200; the air outlets 530 are arranged on the humidifying pipeline 520 extending into the main air inlet pipe 200 at intervals, and the opening direction of the air outlets 530 is not opposite to the flowing direction of the gas to be desulfurized.

Therefore, the humidifying pipes 520 penetrate through the pipe wall of the main air inlet pipe 200 and are arranged at intervals in the radial direction or the axial direction of the main air inlet pipe 200, so that the mixing effect of the water vapor and the flue gas to be desulfurized can be obviously improved; meanwhile, because the opening direction of the air outlet 530 is not opposite to the flowing direction of the gas to be desulfurized, a small amount of sulfuric acid generated by mixing the water vapor and the flue gas to be desulfurized is not easy to attach to the humidifying pipeline 520, and the corrosion speed of the humidifying pipeline 520 is effectively relieved. The corrosion prevention effect is best when the opening of the gas outlet 530 is directed toward the flow direction of the gas to be desulfurized.

The main gas inlet pipe 200 is provided with a horizontal section 232 and a vertical section 231, the humidifying pipeline 520 is connected with the horizontal section 232, and a plurality of gas inlet branch pipes 300 connected with the desulfurization reactor 100 are arranged on the vertical section 231 in parallel; the distance D8 between the humidifying pipeline 520 and the turning part of the main air inlet pipe 200 is preferably 5000-8000 mm; thereby, the placement of inlet manifold 300 is facilitated, helping to ensure that the gas to be desulfurized is uniformly mixed with the water vapor before flowing into the disengaging reactor.

The length D9 of the humidifying pipeline 520 extending into the main air inlet pipe 200 is at least 0.4 times of the diameter of the main air inlet pipe 200, and the distance D10 between the tail end of the humidifying pipeline 520 and the pipe wall of the main air inlet pipe 200 is more than or equal to 50mm. Thereby, the air outlet holes 530 are uniformly arranged on the cross section of the main air inlet pipe 200, and the mixing effect is improved.

The flow rate of the gas to be desulfurized in the main gas inlet pipe 200 is 20000 to 450000m ³ The pipe diameter of the main gas inlet pipe 200 is 500-3000 mm, the flow rate of the steam in the steam conveying pipeline 510 is 0.15-6 t/h, the arrangement distance D11 of the humidifying pipelines 520 is 300-500 mm, the pipe diameter of the humidifying pipelines 520 is 80-150 mm, the aperture of the gas outlet 530 is 40-60 mm, and the arrangement distance D12 of the gas outlet 530 is 100-300 mm, so that the gas inlet pipe can meet various application scenes with different treatment amounts of the gas to be desulfurized in the prior art.

The aperture of the outer air outlet 530 is larger than that of the inner air outlet 530, so that the water vapor flows out at different flow rates, the uniformity of water vapor diffusion is improved, and the mixing effect is improved.

The humidifying structure further comprises a guide pipe 540, the guide pipe 540 is installed on a preset through hole on the main air inlet pipe 200, the humidifying pipeline 520 is detachably connected with the guide pipe 540, and the humidifying pipeline 520 is detachably connected with the steam delivery pipeline 510. Thereby, the maintenance and replacement of the single humidification duct 520 is facilitated. The detachable connection is preferably a flanged connection.

The humidification structure also includes a drain assembly comprising a drain pipe connecting the vapor delivery conduit 510 and the regeneration tank 430. Thereby, the condensed water is prevented from flowing into the intake main pipe 200 to cause corrosion.

The steam delivery pipe 510 is provided with a stop valve 551 and a vortex shedding flowmeter 552, and the drain pipe is provided with a stop valve 551 and a drain valve 553 connected in parallel, so that the steam is stopped and exhausted, and the safety is improved.

As shown in fig. 12, the humidifying structure of the present embodiment has differences compared with the first embodiment: the at least two humidifying pipelines 520 penetrate through the pipe wall of the main air inlet pipe 200 and are arranged at intervals in the radial direction of the main air inlet pipe 200; when the humidifying pipes 520 are arranged at intervals in the axial direction of the main inlet pipe 200, the front end air outlet holes 530 have a larger aperture than the rear end air outlet holes 530.

As shown in fig. 13, the humidification structure of the present embodiment further has, on the basis of the second embodiment, the following arrangement: the main gas inlet pipe 200 has two horizontal sections 232 connected in parallel with the vertical section 231, the two horizontal sections 232 are respectively connected with gas production of different sections, the humidifying structure has two groups of humidifying pipelines 520 arranged in parallel, and the two groups of humidifying pipelines 520 are respectively connected with the two horizontal sections 232.

Fig. 14 is a plan view of a first embodiment of the spray structure of the present invention. Fig. 15 is a top view of a second embodiment of the spray structure of the present invention. Fig. 16 is a front view of a first and second embodiment of the spray structure of the present invention.

As shown in fig. 14 to 16, the spray structure of both embodiments is used for spray regeneration of the desulfurization reactor 100 filled with the desulfurization catalyst 110 in the catalytic flue gas desulfurization device, the spray structure includes spray pipes 600 and spray heads 720, and the number of the spray pipes 600 is adapted to the number of the desulfurization reactors 100; the spray pipe 600 is arranged on the outer side of the top wall of the desulfurization reactor 100, and the spray head 720 is arranged on the inner side of the top wall of the desulfurization reactor 100; the spray pipe 600 comprises a main liquid inlet pipe 610, a branch liquid inlet pipe 620 and a spray mechanism; the liquid inlet main pipe 610 is used for conveying spraying liquid; the number of the liquid inlet branch pipes 620 is at least two, and the at least two liquid inlet branch pipes 620 are arranged at the output end of the liquid inlet main pipe 610 in parallel; each liquid inlet branch pipe 620 is provided with at least two spraying mechanisms which are arranged in parallel, and the output ends of the spraying mechanisms are connected with the spray heads 720; wherein, each desulfurization reactor 100 is provided with a plurality of rows of spray heads 720 which are arranged at intervals and are symmetrically arranged with the center of the desulfurization reactor 100.

The spraying structure also comprises a liquid inlet main pipe 650, and the spraying pipes 600 with the number matched with that of the desulfurization reactors 100 are connected in parallel and then are connected with the liquid inlet main pipe 650; therefore, pipeline arrangement is reduced, and equipment investment is reduced; the main liquid inlet pipe 610 is provided at an edge of the desulfurization reactor 100, which is far from the center, thereby preventing the installation of the spray head 720 from being affected.

The spray pipe 600 is arranged at the top of the desulfurization reactor 100, the top of the desulfurization reactor 100 is provided with a gas outlet 120 and a manhole 130, and the center distance between the spray head 720 and the gas outlet 120 and/or the center distance between the manhole 130 is not less than 150mm. Thereby, the influence of the head 720 on the use of other components is avoided.

As shown in fig. 14, when the cross section of the desulfurization reactor 100 is circular, the two inlet branch pipes 620 are arranged and are axially symmetrically distributed with respect to the center of the desulfurization reactor 100; each liquid inlet branch pipe 620 is provided with a transverse pipe 622 and a longitudinal pipe 621, the input ends of the two longitudinal pipes 621 are connected with the liquid inlet main pipe 610, and the two transverse pipes 622 are arranged in parallel; the spray mechanism has a spray manifold 630 connecting the inlet manifold 620 and the spray head 720.

In the installation direction parallel to the transverse pipe 622, two rows of nozzles 720 (i.e., three nozzles 720 on line1 and line 2) near the center of the desulfurization reactor 100 are distributed in a central symmetry manner around the center of the desulfurization reactor 100, and the rest of the nozzles 720 are distributed in an axial symmetry manner; at least two rows of spray heads 720 are provided on either side of each transverse tube 622; in the installation direction parallel to the longitudinal pipe 621, two rows of nozzles 720 (i.e. three nozzles 720 on line3 and line 4) far away from the center of the desulfurization reactor 100 are distributed in a central symmetry manner around the center of the desulfurization reactor 100, and the rest of the nozzles 720 are distributed in an axial symmetry manner; the plurality of rows of the shower heads 720 are arranged at equal intervals in parallel with the installation direction of the longitudinal pipes 621. At this time, it is possible to uniformly distribute the shower heads 720 and simplify the shower 600 arrangement.

As shown in fig. 15, when the cross section of the desulfurization reactor 100 is rectangular, the liquid inlet branch pipes 620 are three and parallel to the side of the desulfurization reactor 100; the spraying mechanism is provided with a spraying main pipe 640 and a spraying branch pipe 630 which are connected with a liquid inlet branch pipe 620 and a spray head 720, each liquid inlet branch pipe 620 is provided with at least two spraying main pipes 640 which are arranged in parallel, and each spraying main pipe 640 is provided with at least two spraying branch pipes 630 which are arranged in parallel; the spray heads 720 in the directions parallel and perpendicular to the installation direction of the liquid inlet branch pipe 620 are both axially symmetrically distributed about the center of the desulfurization reactor 100.

In the direction parallel to the installation direction of the liquid inlet branch pipes 620, two rows of spray heads 720 are arranged on one side of each liquid inlet branch pipe 620; the plurality of rows of spray heads 720 parallel to the installation direction of the inlet manifold 620 are arranged at equal intervals. Two or four branch showering pipes 630 are disposed on each main shower pipe 640, and the pipe diameter of the main shower pipe 640 disposed with the four branch showering pipes 630 is larger than that of the main shower pipe 640 disposed with the two branch showering pipes 630. At this time, it is possible to uniformly distribute the shower heads 720 and simplify the shower 600 arrangement.

The main gas inlet pipe 200 and the main gas inlet pipe 650 are preferably disposed on the same side of the desulfurization reactor 100 (i.e., as shown in fig. 15), so that the gas inlet direction and the flow direction of the spray liquid are different, which contributes to the improvement of the spray effect.

It is preferable to have a part of the feed main pipe 610 installed on the desulfurization reactor 100 to improve the overall structural stability of the shower pipe 600, and thus, the feed main pipe 650 is directly disposed between two rows of the desulfurization reactors 100, thereby facilitating the disposition of the shower pipe 600.

In the two embodiments, no matter whether the horizontally and vertically arranged spray heads 720 are arranged at equal intervals, the interval between two adjacent rows of spray heads 720 needs to be controlled within 300-1700 mm, so that the spraying effect is good, and the reduction of pipeline arrangement is facilitated.

Compared with the first embodiment, the desulfurization reactor 100 with the rectangular cross section of the second embodiment not only facilitates the arrangement of the spray pipes 600 and is more attractive, but also can be filled with more desulfurization catalysts 110 in unit area, and has larger treatment capacity of the gas to be desulfurized.

As shown in fig. 17, on the basis of the first embodiment or the second embodiment, the shower structure of the present embodiment further has the following arrangement: the spray structure also comprises a spray head installation component, wherein the spray head installation component comprises a horizontal pipe body 711, an elbow pipe body 713, a vertical pipe body 712 and a pre-buried pipe 730; the horizontal pipe 711 is connected with the output end of the spray pipe 600 through a first flange 741; one end of the vertical pipe 712 is connected to the horizontal pipe 711, and the other end is connected to the nozzle 720 and extends above the desulfurization catalyst 110 after passing through a through hole reserved at the top of the desulfurization reactor 100; the horizontal pipe body 711 and the vertical pipe body 712 are connected through an elbow pipe body 713; the embedded pipe 730 is installed on the through hole, and the vertical pipe body 712 is connected with the second flange 742 of the embedded pipe 730.

Therefore, the nozzle mounting assembly and the nozzle 720 can be quickly mounted and dismounted through the first flange 741 and the second flange 742, and the single nozzle 720 can be repaired and replaced.

The horizontal distance D13 between the first flange 741 and the second flange 742 is 100-1000 mm, the distance D14 between the horizontal pipe 711 and the top of the desulfurization reactor 100 is 300-1200 mm, and the height D15 of the pre-buried pipe 730 is 50-300 mm, thereby facilitating the operation.

Traditional desulfurization reactor 100's casing material is the glass steel, and is with high costs and be unfavorable for the installation that sprays the structure, for the installation effectiveness that reduces equipment input cost and promote shower nozzle 720, preferably make desulfurization reactor 100 form by concrete placement, before pouring make pre-buried pipe 730 according to predetermineeing the interval be fixed in the reinforcing bar in advance can, pour and form the pre-buried pipe 730 that is the equidistant range after accomplishing promptly, follow-up can install shower nozzle 720 fast.

On the basis of the first embodiment or the second embodiment, the spray structure of the fourth embodiment further has the following arrangement: the spray structure further comprises a spray head mounting assembly comprising a mounting tube 710; one end of the mounting pipe 710 is detachably connected with the output end of the spray pipe 600, and the other end is connected with the spray head 720 and extends into the upper part of the desulfurization catalyst 110 after penetrating through the through hole at the top of the desulfurization reactor 100; wherein, shower 600's material is the glass steel, installation pipe 710 adopts the PP pipe, and shower nozzle 720 adopts the PP shower nozzle and be spiral shower nozzle, and installation pipe 710 and shower nozzle 720 bond. Thus, the mounting tube 710 and the spray head 720 have a longer service life and are more quickly and aesthetically pleasing to install.

In order to facilitate the installation and the detachment of the nozzle 720, the nozzle installation assembly and the installation pipe 710 may adopt the arrangement convenient to detach in the third embodiment, that is, the nozzle installation assembly is composed of the installation pipe 710 and the embedded pipe 730, and the installation pipe 710 includes a horizontal pipe 711, an elbow pipe 713, and a vertical pipe 712. When the shower 600 of the first or second embodiment is employed, the horizontal pipe body 711 is connected to the shower branch pipe 630.

The spraying preferably adopts cascade spraying (refer to the application number of 202120944544.9 and the Chinese utility model patent document with the name of a flue gas desulfurization device, which discloses fig. 3 and fig. 4), namely, spraying for many times, the sulfuric acid concentration of the spraying liquid adopted by the spraying for many times is reduced in sequence, the regenerated acid liquid generated by the first spraying is recycled as the finished sulfuric acid, and the rest regenerated acid liquid is used as the spraying liquid for next-stage regeneration. As shown in fig. 8, a plurality of regeneration liquid tanks 430 are horizontally arranged in parallel below the lowermost desulfurization reactor 100 and store dilute sulfuric acid having different concentrations as a spray liquid, for example, sulfuric acid concentration: 1# < 2# < 3# < 4#, spraying liquid in 4#, 3#, 2# and 1# is pumped into the desulfurization reactor 100 to be regenerated in sequence during spraying, regenerated acid liquid in 4# is input into the product recovery tank 440 after regeneration, and then the spraying liquid is supplemented through the clear water liquid tank 420. In order to prevent the concentration of the finished sulfuric acid from being affected, the liquid flowing out from the liquid outlet 330 (or liquid outlet pipe), the overflow outlet 340, the second pipe 221 and the drain pipe is discharged into the # 1 regeneration liquid tank 430 with the lowest concentration of the sulfuric acid.

The embodiment of the catalytic flue gas desulfurization device of the utility model is provided with a desulfurization reactor 100, an air inlet structure, a humidifying structure and a spraying structure; the desulfurization reactors 100 are four and arranged in two-layer and two-column shapes, and the desulfurization reactor 100 is filled with a desulfurization catalyst 110; the air intake structure is any one of the air intake structures of the first embodiment to the fifth embodiment; the humidifying structure is any one of the humidifying structures of the first to third embodiments; the spray structure is any one of the spray structures in the first to fourth embodiments. The embodiment of the desulfurization method of the utility model is to adopt the catalytic flue gas desulfurization device to treat the gas to be desulfurized.

The contents of the present invention have been explained above. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. Based on the above-mentioned contents of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

Claims

1. The gas inlet structure is used for inputting gas to be desulfurized into a desulfurization reactor (100) filled with a desulfurization catalyst (110) in the catalytic flue gas desulfurization device, and comprises a main gas inlet pipe (200) and a branch gas inlet pipe (300), wherein the number of the branch gas inlet pipes (300) is matched with that of the desulfurization reactor (100); the method is characterized in that:

the air inlet branch pipe (300) is provided with a descending section and an ascending section which are sequentially arranged between the air inlet main pipe (200) and the desulfurization reactor (100);

a liquid inlet (320) and a liquid outlet (330) are arranged on the pipe body of the air inlet branch pipe (300);

the air intake structure further includes:

the liquid conveying assembly is used for conveying liquid into the corresponding air inlet branch pipe (300) for liquid sealing when the desulfurization catalyst (110) in the desulfurization reactor (100) is regenerated;

a liquid discharge assembly for discharging the liquid seal liquid in the intake manifold (300) after the regeneration of the desulfurization catalyst (110) is completed.

2. The air intake structure of claim 1, wherein: the desulfurization device is provided with two rows of desulfurization reactors (100) which are arranged at intervals, and the main gas inlet pipe (200) is arranged between the two rows of desulfurization reactors (100); and/or the input end of the falling segment is higher than the output end of the rising segment.

3. The air intake structure according to claim 2, wherein: the desulfurization device is provided with at least two rows of desulfurization reactors (100) which are arranged at intervals, and a regeneration liquid tank (430) is arranged below the two desulfurization reactors (100) at the bottom layer; and/or the main air inlet pipe (200) and the branch air inlet pipes (300) are arranged outside the two rows of desulfurization reactors (100).

4. The air intake structure of claim 3, wherein:

the infusion set includes:

a support plate, which is bridged between the two desulfurization reactors (100) positioned at the top layer;

a water tank (410), the water tank (410) being mounted on the support plate;

a first infusion tube connected to the tank (410) and the inlet port (320); or,

the infusion set includes:

the second liquid conveying pipe is connected with the clear water liquid tank (420) and the liquid inlet (320);

a water pump that feeds water for regenerating the desulfurization catalyst (110) into the intake manifold (300).

5. The air intake structure of claim 3, wherein: the liquid discharge assembly comprises a liquid discharge pipe, and the liquid discharge pipe is connected with a liquid discharge port (330) and a regeneration liquid tank (430).

6. The air intake structure of claim 1, wherein: the air inlet structure also comprises a control structure for controlling the input amount of the liquid seal liquid in the air inlet branch pipe (300); the control structure includes:

a first detector for detecting the flow rate or pressure of the gas to be desulfurized;

the second detector is used for detecting the liquid seal liquid level height in the air inlet branch pipe (300);

and the controller is used for controlling the start and stop of the infusion assembly according to the detection results of the first detector and the second detector.

7. The air intake structure of claim 1, wherein: the air inlet branch pipe (300) is U-shaped.

8. The air intake structure of claim 7, wherein: the air inlet branch pipe (300) comprises a first horizontal pipe (311), a first elbow pipe (312), a first vertical pipe (313), a second elbow pipe (314), a second horizontal pipe (315), a third elbow pipe (316), a second vertical pipe (317), a fourth elbow pipe (318) and a third horizontal pipe (319), which are connected in sequence, and the liquid inlet (320) is formed in the first vertical pipe (313); the liquid outlet (330) is arranged on the second horizontal pipe (315).

9. The air intake structure of claim 1, wherein: the top of the air inlet main pipe (200) is provided with a pressure relief assembly, and the pressure relief assembly comprises a first pipe body (211) and a first valve (212); and/or a effusion discharge assembly is arranged at the bottom of the main air inlet pipe (200), and comprises a second pipe body (221) and a second valve (222).

10. The catalytic flue gas desulfurization device is provided with at least two desulfurization reactors (100) which are arranged in parallel, and desulfurization catalysts (110) are filled in the desulfurization reactors (100); the method is characterized in that: there is also provided the air intake structure as recited in any one of claims 1 to 9.