CN109806753B - Reduction circulation desulfurization device and desulfurization method - Google Patents
Reduction circulation desulfurization device and desulfurization method Download PDFInfo
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- CN109806753B CN109806753B CN201910140737.6A CN201910140737A CN109806753B CN 109806753 B CN109806753 B CN 109806753B CN 201910140737 A CN201910140737 A CN 201910140737A CN 109806753 B CN109806753 B CN 109806753B
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Abstract
The utility model relates to a reduction cycle desulfurization device, comprising: desulfurizing tower, desulfurizing agent reduction fluid supplementing device; the desulfurizing tower includes: the upper end of the demister is provided with an exhaust port, the demister is arranged in the outer cylinder and is provided with a connecting shaft, an inner cylinder is arranged below the demister, the upper end of the inner cylinder is pivoted with the connecting shaft, a wind wheel is connected with the outer periphery of the inner cylinder and is pivoted with the inner periphery of the outer cylinder, a desulfurizing agent spraying device is arranged above the inner cylinder, a plurality of flue gas inlet annular rings are arranged on the side wall of the outer cylinder, a plurality of flue gas nozzles are arranged on the inner periphery of the flue gas inlet annular rings, the outlet ends of the flue gas nozzles are opposite to the outer periphery of the inner cylinder, an air inlet fan and an air nozzle group are arranged, and an air inlet device is arranged below the inner cylinder, and a liquid storage pool is arranged at the bottom of the outer cylinder; the liquid storage tank is provided with a circulating pump, a liquid supplementing port communicated with the desulfurizing agent reduction circulating device and a liquid discharging port positioned below the liquid supplementing port; the outlet end of the circulating pump is communicated with the desulfurizing agent spraying device. The reducing and circulating desulfurization device has smaller dosage of desulfurizing agent and better desulfurization effect.
Description
Technical Field
The utility model relates to the field of flue gas desulfurization, in particular to a reduction cycle desulfurization device and a desulfurization method.
Background
Sulfur dioxide in the flue gas of the power plant boiler pollutes the environment; the utility model of China patent application No. 201620154089.1 discloses a self-circulation desulfurizing tower, which comprises: an outer cylinder; the top cover is covered on the top of the outer cylinder and is provided with an exhaust port; the inner cylinder is sleeved in the outer cylinder and is fixedly connected with the outer cylinder through a supporting piece between cylinders; a spraying device; a tail gas inlet device; an air intake device; a sedimentation device; and a purge gas inlet means. The traditional desulfurizing tower has the defects of large dosage of desulfurizing agent and poor desulfurizing effect; therefore, the design of a reduction cycle desulfurization device and a desulfurization method with smaller dosage of desulfurizing agent and better desulfurization effect becomes a problem to be solved urgently.
Disclosure of Invention
The utility model aims to overcome the defects of large dosage of desulfurizing agent and poor desulfurizing effect of the existing desulfurizing tower, and provides a reduction circulation desulfurizing device and a desulfurizing method with small dosage of desulfurizing agent and good desulfurizing effect.
The specific technical scheme of the utility model is as follows:
a reductive cycle desulfurization apparatus comprising: desulfurizing tower, desulfurizing agent reduction fluid supplementing device; the desulfurizing tower includes: the upper end of the demister is provided with an exhaust port, the demister is arranged in the outer cylinder and is provided with a connecting shaft, an inner cylinder is arranged below the demister, the upper end of the inner cylinder is pivoted with the connecting shaft, a wind wheel is connected with the outer periphery of the inner cylinder and is pivoted with the inner periphery of the outer cylinder, a desulfurizing agent spraying device is arranged above the inner cylinder, a plurality of flue gas inlet annular rings are arranged on the side wall of the outer cylinder, a plurality of flue gas nozzles are arranged on the inner periphery of the flue gas inlet annular rings, the outlet ends of the flue gas nozzles are opposite to the outer periphery of the inner cylinder, an air inlet fan and an air nozzle group are arranged, and an air inlet device is arranged below the inner cylinder, and a liquid storage pool is arranged at the bottom of the outer cylinder; the liquid storage tank is provided with a circulating pump, a liquid supplementing port communicated with the desulfurizing agent reduction circulating device and a liquid discharging port positioned below the liquid supplementing port; the outlet end of the circulating pump is communicated with the desulfurizing agent spraying device. The reduction circulation desulfurization device is characterized in that the desulfurizing agent sprayed from the atomizing nozzle group absorbs sulfur-containing gas in the ascending flue gas and then falls into the liquid storage tank, and the desulfurizing agent is circularly sprayed from the atomizing nozzle group under the action of the circulating pump; the air sprayed from the air nozzle group carries out reduction treatment on the desulfurizing agent, and the desulfurizing agent in the liquid storage tank is reduced and supplemented by the desulfurizing agent reduction and supplementation device, so that the dosage of the desulfurizing agent is small, and the desulfurizing effect is good; the wind wheel drives the inner cylinder to rotate under the action of rising smoke, so that the smoke is uniformly distributed between the outer cylinder and the inner cylinder to rise, and the flue gas is favorable for being fully mixed with the desulfurizing agent.
The desulfurizing agent reduction fluid replacement device comprises: the upper end of the reducing tank is communicated with the liquid outlet through a liquid discharge electromagnetic stop valve, a liquid supplementing pump is arranged in the reducing tank, the upper part of the reducing tank is communicated with the desulfurizing agent tank, the lower part of the reducing tank is communicated with the lower part of the reducing tank, and the reducing tank is provided with a sedimentation tank, a controller, a pH on-line detector and a liquid level meter which are arranged in the liquid storage tank; the outlet end of the fluid infusion pump is communicated with the fluid infusion port through a fluid infusion electromagnetic stop valve. The desulfurizing agent reduction fluid replacement device is used for reducing the desulfurizing agent through the reduction tank, then flowing into the desulfurizing agent tank for fluid replacement, and the waste liquid flows into the sedimentation tank for sedimentation, and the supernatant fluid positioned at the upper part of the sedimentation tank after sedimentation can be recycled; the pH value of the desulfurizing agent in the liquid storage tank can be kept within a set range, and the liquid level of the desulfurizing agent in the liquid storage tank can be kept at a set height through the pH on-line detector, the liquid level meter, the liquid draining electromagnetic stop valve and the liquid supplementing electromagnetic stop valve which are respectively and electrically connected with the controller.
The reduction cell includes: the device comprises a mounting plate arranged at the upper end of a reduction tank, a heater arranged at the lower end of the reduction tank, a motor connected with the upper end of the mounting plate, a driving gear connected with an output shaft of the motor, a hollow main shaft pivoted with the mounting plate, a driven gear connected with the hollow main shaft and meshed with the driving gear, a rotary joint with the lower end connected with the upper end of the hollow main shaft, an aeration fan with the upper end of the rotary joint at the outlet end, a sun gear sleeved outside the hollow main shaft and connected with the lower end of the mounting plate, at least one main aeration device arranged at the lower part of the hollow main shaft, and a plurality of auxiliary aeration devices circumferentially distributed along the hollow main shaft; the main aeration device comprises: a plurality of main stirring pipes provided with main aeration nozzle groups, the inner ends of which are connected with the outer periphery of the hollow main shaft; the secondary aeration device includes: the inner end of the planetary gear is connected with the outer side wall of the hollow main shaft, the connecting sleeve is connected with the outer end of the connecting sleeve, the hollow auxiliary shaft is pivoted with the connecting sleeve, the planetary gear is connected with the upper end of the hollow auxiliary shaft and meshed with the sun gear, and the planetary gear is provided with a plurality of auxiliary stirring pipes which are provided with auxiliary aeration nozzle groups and the inner end of which is connected with the outer side wall of the hollow auxiliary shaft; the inner hole of the main stirring pipe is communicated with the inner hole of the hollow main shaft; the inner hole of the auxiliary stirring pipe, the inner hole of the hollow auxiliary shaft and the inner hole of the connecting pipe are sequentially communicated and communicated with the inner hole of the hollow main shaft. The hollow main shaft of the reduction tank drives the main stirring pipe of the main aeration device and the connecting pipe of the auxiliary aeration device to rotate, the connecting pipe drives the hollow auxiliary shaft and the auxiliary stirring pipe to revolve, and the planetary gear meshed with the sun gear drives the hollow auxiliary shaft and the auxiliary stirring pipe to rotate, so that CO is sprayed from the main aeration nozzle group of the main aeration device and the auxiliary aeration nozzle group of the auxiliary aeration device respectively 2 The gas is fully mixed with the desulfurizing agent flowing into the reduction pool from the liquid storage pool, and the heating of the heater is improved, so that the reduction reaction speed and the reaction sufficiency are improved.
The desulfurizing tower also includes: the flushing spraying device is arranged above the demister; the sedimentation tank is provided with a flushing pump; the outlet end of the flushing pump is communicated with the flushing spraying device. The flushing spraying device is favorable for improving the demisting effect of the demister.
The flushing and spraying device comprises: and a plurality of flushing pipe rings which are coaxially arranged with the inner cylinder and provided with flushing nozzle groups at the lower side are arranged on flushing connecting pipes which penetrate through the side wall of the outer cylinder and are communicated with the flushing pipe rings and the outlet ends of the flushing pump in one-to-one correspondence. The flushing spraying device has simple and practical structure.
The inner barrel comprises: the large end of the upper frustum body is positioned at the lower end of the lower frustum body, and the large end of the lower frustum body is positioned at the upper end of the lower frustum body and connected with the large end of the upper frustum body; the upper frustum body and the lower frustum body are coaxially arranged, and the diameter of the large end of the upper frustum body is equal to that of the large end of the lower frustum body. The upper frustum body of the inner cylinder is beneficial to slowing down the rising speed of the flue gas and prolonging the desulfurization reaction time; the lower frustum body is favorable for reducing the desulfurizing agent by air sprayed from the air nozzle group.
The desulfurizing agent spray device comprises: the plurality of desulfurization pipes are distributed along the circumference of the hollow rotary joint, and the lower side of the desulfurization pipes is provided with an atomizing nozzle group; the inner end of the desulfurization pipe is connected with the hollow rotary joint; the inner hole of the desulfurization pipe is communicated with the outlet end of the circulating pump through a hollow rotary joint. The desulfurizing agent spraying device has simple and practical structure.
The demister comprises: and a plurality of defogging rings which are formed by corrugated plates and are coaxially arranged outside the connecting shaft, and supporting frames which are respectively connected with the inner side wall of the outer cylinder, the upper end of the defogging rings and the upper end of the connecting shaft. The demister is simple and practical in structure; the demisting effect is good.
The desulfurization method of the reduction cycle desulfurization device comprises the steps that (1) flue gas of a power plant boiler is sprayed onto the outer periphery of an inner cylinder through a flue gas inlet annular ring, and a wind wheel drives the inner cylinder to rotate under the action of rising flue gas, so that the flue gas is uniformly distributed between the outer cylinder and the inner cylinder to rise; the desulfurizing agent sprayed from the atomizing nozzle group absorbs sulfur-containing gas in the ascending flue gas, then falls into the liquid storage tank, and is circularly sprayed from the atomizing nozzle group for desulfurization under the action of the circulating pump; reducing the desulfurizing agent by air sprayed from the air nozzle group; demisting the desulfurized flue gas by a demister and discharging the desulfurized flue gas from an exhaust port; (2) When the pH on-line detector detects that the pH value of the desulfurizing agent in the liquid storage tank deviates from a set range, the controller controls the liquid discharge electromagnetic stop valve to be communicated, the desulfurizing agent in the liquid storage tank flows into the reduction tank,the liquid supplementing electromagnetic stop valve is communicated, and under the action of the liquid supplementing pump, the desulfurizing agent in the desulfurizing agent tank is supplemented into the liquid storage tank, so that the pH value of the desulfurizing agent in the liquid storage tank reaches a set range; (3) When the liquid level meter detects that the liquid level of the desulfurizing agent in the liquid storage tank is lower than the set height, the controller controls the fluid supplementing electromagnetic stop valve to be communicated, and under the action of the fluid supplementing pump, the desulfurizing agent in the desulfurizing agent tank is supplemented into the liquid storage tank, so that the liquid level of the desulfurizing agent in the liquid storage tank reaches the set height; (4) The output shaft of the motor drives the main stirring pipe of the main aeration device and the connecting pipe of the auxiliary aeration device to rotate through the driving gear, the driven gear and the hollow main shaft, the connecting pipe drives the hollow auxiliary shaft and the auxiliary stirring pipe to revolve, and the planetary gear meshed with the sun gear drives the hollow auxiliary shaft and the auxiliary stirring pipe to rotate; under the action of an aeration fan, CO connected with the inlet end of the aeration fan 2 The gas is sprayed out from a main aeration nozzle group of a main aeration device and a secondary aeration nozzle group of a secondary aeration device respectively through a rotary joint and a hollow main shaft, and is mixed with the desulfurizing agent flowing into a reduction tank from a liquid storage tank to carry out reduction reaction, the desulfurizing agent at the upper part of the reduction tank after the reduction reaction flows into a desulfurizing agent tank, and the waste liquid at the lower part of the reduction tank flows into a sedimentation tank; (5) Under the action of a flushing pump, supernatant liquid at the upper part of the sedimentation tank after sedimentation is sprayed out from a flushing nozzle group of a flushing spray device to flush the demister, and crystals precipitated at the bottom of the sedimentation tank are discharged through a sedimentation outlet. The desulfurization method of the reduction cycle desulfurization device can meet the requirements of smaller dosage of desulfurizing agent and better desulfurization effect.
Compared with the prior art, the utility model has the beneficial effects that: the reduction circulation desulfurization device is characterized in that the desulfurizing agent sprayed from the atomizing nozzle group absorbs sulfur-containing gas in the ascending flue gas and then falls into the liquid storage tank, and the desulfurizing agent is circularly sprayed from the atomizing nozzle group under the action of the circulating pump; the air sprayed from the air nozzle group carries out reduction treatment on the desulfurizing agent, and the desulfurizing agent in the liquid storage tank is reduced and supplemented by the desulfurizing agent reduction and supplementation device, so that the dosage of the desulfurizing agent is small, and the desulfurizing effect is good; the wind wheel drives the inner cylinder to rotate under the action of rising smoke, so that the smoke is uniformly distributed between the outer cylinder and the inner cylinder to rise, and the flue gas is favorable for being fully mixed with the desulfurizing agent. Desulfurizing agent reduction fluid infusion device, through reduction pond to take offThe sulfur agent flows into a desulfurizing agent tank for supplementing liquid after being reduced, the waste liquid flows into a sedimentation tank for sedimentation, and supernatant liquid positioned at the upper part of the sedimentation tank after sedimentation can be recycled; the pH value of the desulfurizing agent in the liquid storage tank can be kept within a set range, and the liquid level of the desulfurizing agent in the liquid storage tank can be kept at a set height through the pH on-line detector, the liquid level meter, the liquid draining electromagnetic stop valve and the liquid supplementing electromagnetic stop valve which are respectively and electrically connected with the controller. The hollow main shaft of the reduction tank drives the main stirring pipe of the main aeration device and the connecting pipe of the auxiliary aeration device to rotate, the connecting pipe drives the hollow auxiliary shaft and the auxiliary stirring pipe to revolve, and the planetary gear meshed with the sun gear drives the hollow auxiliary shaft and the auxiliary stirring pipe to rotate, so that CO is sprayed from the main aeration nozzle group of the main aeration device and the auxiliary aeration nozzle group of the auxiliary aeration device respectively 2 The gas is fully mixed with the desulfurizing agent flowing into the reduction pool from the liquid storage pool, and the heating of the heater is improved, so that the reduction reaction speed and the reaction sufficiency are improved. The flushing spraying device is favorable for improving the demisting effect of the demister. The upper frustum body of the inner cylinder is beneficial to slowing down the rising speed of the flue gas and prolonging the desulfurization reaction time; the lower frustum body is favorable for reducing the desulfurizing agent by air sprayed from the air nozzle group. The flushing spraying device and the desulfurizing agent spraying device have simple and practical structures. The demister is simple and practical in structure; the demisting effect is good. The desulfurization method of the reduction cycle desulfurization device can meet the requirements of smaller dosage of desulfurizing agent and better desulfurization effect.
Drawings
Fig. 1 is a schematic view of a structure of the present utility model.
In the figure: the desulfurization tower 3, the exhaust port 31, the outer cylinder 32, the connecting shaft 33, the wind wheel 34, the flue gas inlet annular ring 35, the flue gas nozzle 36, the air inlet fan 37, the air nozzle group 38, the liquid storage tank 39, the circulating pump 310, the flushing nozzle group 311, the flushing pipe ring 312, the flushing connecting pipe 313, the upper frustum body 314, the lower frustum body 315, the hollow rotary joint 316, the atomizing nozzle group 317, the desulfurization pipe 318, the demisting ring 319, the supporting frame 320, the air inlet device 321, the desulfurizing agent reduction liquid supplementing device 4, the liquid discharge electromagnetic stop valve 41, the reduction tank 42, the liquid supplementing pump 43, the mounting plate 44, the desulfurizing agent tank 45, the sedimentation tank 46, the controller 47, the pH online detector 48, the liquid level meter 49, the liquid supplementing electromagnetic stop valve 410, the heater 411, the motor 412, the driving gear 413, the hollow main shaft 414, the driven gear 415, the rotary joint 416, the aeration fan 417, the sun gear 418, the main aeration nozzle group 419, the main stirring pipe 420, the connecting pipe 421, the connecting sleeve 422, the hollow auxiliary shaft 423, the planetary gear 424, the auxiliary aeration group 425, the auxiliary stirring pipe 426, and the auxiliary stirring pipe nozzle 427.
Detailed Description
The technical scheme of the utility model is further specifically described below through specific embodiments and with reference to the accompanying drawings. It should be understood that the practice of the utility model is not limited to the following examples, but is intended to be within the scope of the utility model in any form and/or modification thereof.
As shown in fig. 1: a reductive cycle desulfurization apparatus comprising: a desulfurizing tower 3, a desulfurizing agent reduction fluid supplementing device 4; the desulfurizing tower 3 includes: the upper end of the demister is provided with an outer cylinder 32 of an exhaust port 31, the demister is arranged in the outer cylinder 32 and is provided with a connecting shaft 33, an inner cylinder is arranged below the demister, the upper end of the inner cylinder is pivoted with the connecting shaft 33 through a bearing, a wind wheel 34 is in threaded connection with the outer side wall of the inner cylinder and the inner side wall of the outer cylinder 32 through a bearing, a desulfurizing agent spraying device is arranged above the inner cylinder, a smoke inlet annular ring 35 is arranged on the side wall of the outer cylinder 32, six smoke nozzles 36 are arranged on the inner side wall of the smoke inlet annular ring 35, the outlet end of the smoke inlet nozzles are opposite to the outer side wall of the inner cylinder, an air inlet device 321 is arranged below the inner cylinder and is provided with an air inlet fan 37 and an air nozzle group 38, and a liquid storage tank 39 is arranged at the bottom of the outer cylinder 32; the liquid storage tank 39 is provided with a circulating pump 310, a liquid supplementing port communicated with the desulfurizing agent reduction circulating device and a liquid discharging port positioned below the liquid supplementing port; the outlet end of the circulation pump 310 communicates with the desulfurizing agent spray apparatus.
The desulfurizing agent reduction fluid replacement device 4 comprises: a reducing tank 42 with the upper end communicated with a liquid outlet through a liquid discharge electromagnetic stop valve 41, a desulfurizing agent tank 45 with a liquid supplementing pump 43 and the upper part communicated with the upper part of the reducing tank 42, a sedimentation tank 46 with the lower part communicated with the lower part of the reducing tank 42, a controller 47, a pH on-line detector 48 and a liquid level detector 49 arranged in the liquid storage tank 39; the outlet end of the fluid infusion pump 43 is communicated with the fluid infusion port through a fluid infusion electromagnetic stop valve 410.
The reduction cell 42 includes: the device comprises a mounting plate 44 arranged at the upper end of a reduction tank 42, a heater 411 arranged at the lower end of the reduction tank 42, a motor 412 in threaded connection with the upper end of the mounting plate 44, a driving gear 413 in key connection with an output shaft of the motor 412, a hollow main shaft 414 in pin joint with the mounting plate 44 through a bearing, a driven gear 415 in key connection with the hollow main shaft 414 and meshed with the driving gear 413, a rotary joint 416 in threaded connection with the upper end of the hollow main shaft 414 at the lower end, an aeration fan 417 in communication with the upper end of the rotary joint 416 at the outlet end, a sun gear 418 sleeved outside the hollow main shaft 414 and in threaded connection with the lower end of the mounting plate 44, two main aeration devices arranged at the lower part of the hollow main shaft 414, and four auxiliary aeration devices circumferentially distributed along the hollow main shaft 414; the main aeration device comprises six main stirring pipes 420 provided with main aeration nozzle groups 419, and the inner ends of the main stirring pipes are in threaded connection with the outer side walls of the hollow main shafts 414; the secondary aeration device includes: the inner end of the connecting pipe 421 is in threaded connection with the outer side of the hollow main shaft 414, the connecting sleeve 422 is in threaded connection with the outer end of the connecting pipe 421, the hollow auxiliary shaft 423 is pivoted with the connecting sleeve 422 through a bearing, the planetary gear 424 is connected with the upper end of the hollow auxiliary shaft 423 in a key way and meshed with the sun gear 418, and the four auxiliary stirring pipes 426 are provided with auxiliary aeration nozzle groups 425, and the inner end of each auxiliary stirring pipe is in threaded connection with the outer side of the hollow auxiliary shaft 423; the inner hole of the main stirring pipe 420 is communicated with the inner hole of the hollow main shaft 414; the inner hole of the auxiliary stirring pipe 426, the inner hole of the hollow auxiliary shaft 423 and the inner hole of the connecting pipe 421 are sequentially communicated and communicated with the inner hole of the hollow main shaft 414.
The desulfurizing tower 3 further comprises: the flushing spraying device is arranged above the demister; the sedimentation tank 46 is provided with a flushing pump 427; the outlet end of the rinse pump 427 is in communication with a rinse spray device.
The pH on-line detector 48, the liquid level meter 49, the motor 412, the flushing pump 427, the liquid draining electromagnetic stop valve 41 and the liquid supplementing electromagnetic stop valve 410 are respectively and electrically connected with the controller 47.
The flushing and spraying device comprises: six flushing pipe rings 312 which are coaxially arranged with the inner cylinder and provided with a flushing nozzle group 311 at the lower side are arranged on the flushing connecting pipes 313 which penetrate through the side wall of the outer cylinder 32 and are correspondingly communicated with the flushing pipe rings 312 and the outlet ends of the flushing pumps 427 one by one at both ends. The lower end of the flushing connection pipe 313 is welded to the flushing pipe loop 312.
The inner barrel comprises: an upper frustum body 314 with a large end positioned at the lower end, and a lower frustum body 315 with a large end positioned at the upper end and connected with the large end of the upper frustum body 314; the upper frustum body 314 and the lower frustum body 315 are coaxially arranged, and the diameter of the large end of the upper frustum body 314 is equal to that of the large end of the lower frustum body 315. In this embodiment, the flue gas nozzle 36 is opposite to the outer periphery of the upper frustum 314; the wind wheel 34 is in threaded connection with the outer periphery of the upper frustum 314.
The desulfurizing agent spray device comprises: the hollow rotary joint 316 is in threaded connection with the connecting shaft 33, and six desulfurization tubes 318 are distributed along the circumference of the hollow rotary joint 316 and provided with atomizing nozzle groups 317 at the lower side; the inner end of the desulfurization pipe 318 is in threaded connection with the hollow rotary joint 316; the inner bore of the desulphurisation pipe 318 communicates with the outlet end of the circulation pump 310 via a hollow swivel 316.
The demister comprises: a plurality of defogging rings 319 which are formed by wave-shaped plate rings and are coaxially arranged outside the connecting shaft 33, and support frames 320 which are respectively connected with the inner side wall of the outer cylinder 32, the upper end of the defogging rings 319 and the upper end of the connecting shaft 33.
The desulfurization method of the reduction cycle desulfurization device comprises the steps that (1) flue gas of a power plant boiler is sprayed onto the outer periphery of an inner cylinder from a flue gas nozzle 36 through a flue gas inlet annular ring 35, and a wind wheel 34 drives the inner cylinder to rotate under the action of rising flue gas, so that the flue gas is uniformly distributed between the outer cylinder 32 and the inner cylinder to rise; the desulfurizing agent sprayed from the atomizing nozzle group 317 absorbs the sulfur-containing gas in the ascending flue gas, then falls into the liquid storage tank 39, and is circularly sprayed from the atomizing nozzle group 317 for desulfurization under the action of the circulating pump 310; CO in air ejected from the air nozzle group 38 2 Reducing the desulfurizing agent; the desulfurized flue gas is discharged from the exhaust port 31 after demisted by a demister; (2) When the pH on-line detector 48 detects that the pH value of the desulfurizing agent in the liquid storage tank 39 deviates from the set range, the controller 47 controls the liquid discharge electromagnetic stop valve 41 to be communicated, the desulfurizing agent in the liquid storage tank 39 flows into the reduction tank 42, the liquid supplementing electromagnetic stop valve 410 is communicated, and under the action of the liquid supplementing pump 43, the desulfurizing agent in the desulfurizing agent tank 45 is supplemented into the liquid storage tank 39, so that the pH value of the desulfurizing agent in the liquid storage tank 39 reaches the set range; (3) When the level gauge 49 detects that the level of the desulfurizing agent in the reservoir 39 is lower than the set level,the controller 47 controls the fluid-supplementing electromagnetic stop valve 410 to be communicated, and under the action of the fluid-supplementing pump 43, the desulfurizing agent in the desulfurizing agent tank 45 is supplemented into the liquid storage tank 39, so that the liquid level of the desulfurizing agent in the liquid storage tank 39 reaches the set height; (4) The output shaft of the motor 412 drives the main stirring pipe 420 of the main aeration device and the connecting pipe 421 of the auxiliary aeration device to rotate through the driving gear 413, the driven gear 415 and the hollow main shaft 414, the connecting pipe 421 drives the hollow auxiliary shaft 423 and the auxiliary stirring pipe 426 to revolve, and the planetary gear 424 meshed with the sun gear 418 drives the hollow auxiliary shaft 423 and the auxiliary stirring pipe 426 to rotate; under the action of the aeration fan 417, CO connected with the inlet end of the aeration fan 417 2 The gas is sprayed out from a main aeration nozzle group 419 of a main aeration device and a secondary aeration nozzle group 425 of a secondary aeration device respectively through a rotary joint 416 and a hollow main shaft 414, and is mixed with the desulfurizing agent flowing into the reduction tank 42 from the liquid storage tank 39 to carry out reduction reaction, the desulfurizing agent at the upper part of the reduction tank 42 after the reduction reaction flows into the desulfurizing agent tank 45, and the waste liquid at the lower part of the reduction tank 42 flows into the sedimentation tank 46; (5) Under the action of the flushing pump 427, the supernatant liquid at the upper part of the sedimentation tank 46 after sedimentation is sprayed out from the flushing nozzle group 311 of the flushing spray device to flush the demister, and the crystals precipitated at the bottom of the sedimentation tank 46 are discharged through a sedimentation outlet.
In particular, the desulfurizing agent in the liquid storage tank 39 and the desulfurizing agent tank 45 can be NaOH or Na 2 CO 3 Because of the desulfurizing agent pair H 2 S has better adsorptivity, is called lean solution for short, and is contacted and mixed with reversely flowing flue gas which is introduced into the desulfurizing tower 3, na 2 CO 3 And NaOH can be combined with H 2 The S reaction comprises the following specific reaction contents: h 2 S+2 Na 2 CO 3 ＝2NaHCO 3 +Na 2 S；2NaOH+H 2 S＝Na 2 S+2H 2 O；
Na produced after the reaction 2 S is discharged through the liquid storage tank 39 at the bottom of the desulfurizing tower 3, because a large amount of H is adsorbed in the liquid at this time 2 S, so the rich liquid is short for the sake, and after the rich liquid flows into the reduction tank 42, the CO is connected with the inlet end of the aeration fan 417 under the action of the aeration fan 417 2 The gas is respectively aerated from a main aeration nozzle group 419 of the main aeration device and a secondary aeration of the secondary aeration deviceNozzle group 425 ejects, H 2 CO 3 > H 2 S >HCO 3 - >HS - So to Na 2 Introducing a small amount of CO into the S solution 2 The order in which the reactions occur is: s is S 2- +CO 2 +H 2 O＝HS - +HCO 3 - ，HCO 3 - +S 2- ＝HS - +CO 3 2- The overall reaction is therefore: 2Na 2 S+CO 2 +H 2 O＝2NaHS+Na 2 CO 3 The products produced are NaHS and Na 2 CO 3 The method comprises the steps of carrying out a first treatment on the surface of the Adding excessive CO 2 The method comprises the following steps: CO 3 2- + H 2 O+CO 2 ＝2HCO 3 - Recurrence: HS (HS) - +H 2 O+CO 2 ＝H 2 S+HCO 3 - The final product is NaHCO 3 And H 2 S, H produced 2 S can be recovered.
In addition, H 2 Solubility of S at 10 ℃ of 15.4g/100ml, na 2 Solubility of S at 10 ℃ of 6.9g/100ml NaHCO 3 Solubility of 7.4g/100ml at 10 degrees Celsius, na 2 CO 3 Is 12.5g/100ml at 10 degrees Celsius, na can be seen 2 S has the lowest solubility and will therefore be CO 2 The reacted liquid is further introduced into a sedimentation tank 46 for Na 2 S precipitation operation, precipitated Na 2 S crystal is discharged from the precipitation outlet, and the supernatant liquid can still adsorb H 2 S gas is sent into the desulfurizing tower 3 again through the flushing pump 427, and the supernatant fluid is sprayed out from the flushing nozzle group 311 of the flushing spraying device to flush the demister and adsorb H in the flue gas 2 S, thereby achieving the purpose of recycling the desulfurizing agent.
The beneficial effects of the utility model are as follows: the reduction circulation desulfurization device is characterized in that the desulfurizing agent sprayed from the atomizing nozzle group absorbs sulfur-containing gas in the ascending flue gas and then falls into the liquid storage tank, and the desulfurizing agent is circularly sprayed from the atomizing nozzle group under the action of the circulating pump; the air ejected from the air nozzle group is used for reducing the desulfurizing agent and passing throughThe desulfurizing agent reduction fluid replacement device is used for reducing and fluid replacement of the desulfurizing agent in the liquid storage tank, so that the dosage of the desulfurizing agent is small, and the desulfurizing effect is good; the wind wheel drives the inner cylinder to rotate under the action of rising smoke, so that the smoke is uniformly distributed between the outer cylinder and the inner cylinder to rise, and the flue gas is favorable for being fully mixed with the desulfurizing agent. The desulfurizing agent reduction fluid replacement device is used for reducing the desulfurizing agent through the reduction tank, then flowing into the desulfurizing agent tank for fluid replacement, and the waste liquid flows into the sedimentation tank for sedimentation, and the supernatant fluid positioned at the upper part of the sedimentation tank after sedimentation can be recycled; the pH value of the desulfurizing agent in the liquid storage tank can be kept within a set range, and the liquid level of the desulfurizing agent in the liquid storage tank can be kept at a set height through the pH on-line detector, the liquid level meter, the liquid draining electromagnetic stop valve and the liquid supplementing electromagnetic stop valve which are respectively and electrically connected with the controller. The hollow main shaft of the reduction tank drives the main stirring pipe of the main aeration device and the connecting pipe of the auxiliary aeration device to rotate, the connecting pipe drives the hollow auxiliary shaft and the auxiliary stirring pipe to revolve, and the planetary gear meshed with the sun gear drives the hollow auxiliary shaft and the auxiliary stirring pipe to rotate, so that CO is sprayed from the main aeration nozzle group of the main aeration device and the auxiliary aeration nozzle group of the auxiliary aeration device respectively 2 The gas is fully mixed with the desulfurizing agent flowing into the reduction pool from the liquid storage pool, and the heating of the heater is improved, so that the reduction reaction speed and the reaction sufficiency are improved. The flushing spraying device is favorable for improving the demisting effect of the demister. The upper frustum body of the inner cylinder is beneficial to slowing down the rising speed of the flue gas and prolonging the desulfurization reaction time; the lower frustum body is favorable for reducing the desulfurizing agent by air sprayed from the air nozzle group. The flushing spraying device and the desulfurizing agent spraying device have simple and practical structures. The demister is simple and practical in structure; the demisting effect is good. The desulfurization method of the reduction cycle desulfurization device can meet the requirements of smaller dosage of desulfurizing agent and better desulfurization effect.
In addition to the above embodiments, the technical features or technical data of the present utility model may be rearranged and combined within the scope of the claims and the description of the present utility model to constitute new embodiments, which may be implemented without inventive effort by those skilled in the art, and thus, embodiments of the present utility model not described in detail should be considered as embodiments of the present utility model within the scope of the protection of the present utility model.
Claims (7)
1. A reductive cycle desulfurization apparatus comprising: the desulfurizing tower, characterized by, reduction cycle desulfurization device still include: a desulfurizing agent reduction fluid supplementing device; the desulfurizing tower includes: the upper end of the demister is provided with an exhaust port, the demister is arranged in the outer cylinder and is provided with a connecting shaft, an inner cylinder is arranged below the demister, the upper end of the inner cylinder is pivoted with the connecting shaft, a wind wheel is connected with the outer periphery of the inner cylinder and is pivoted with the inner periphery of the outer cylinder, a desulfurizing agent spraying device is arranged above the inner cylinder, a plurality of flue gas inlet annular rings are arranged on the side wall of the outer cylinder, a plurality of flue gas nozzles are arranged on the inner periphery of the flue gas inlet annular rings, the outlet ends of the flue gas nozzles are opposite to the outer periphery of the inner cylinder, an air inlet fan and an air nozzle group are arranged, and an air inlet device is arranged below the inner cylinder, and a liquid storage pool is arranged at the bottom of the outer cylinder; the liquid storage tank is provided with a circulating pump, a liquid supplementing port communicated with the desulfurizing agent reduction circulating device and a liquid discharging port positioned below the liquid supplementing port; the outlet end of the circulating pump is communicated with the desulfurizing agent spraying device; the desulfurizing agent reduction fluid replacement device comprises: the upper end of the reducing tank is communicated with the liquid outlet through a liquid discharge electromagnetic stop valve, a liquid supplementing pump is arranged in the reducing tank, the upper part of the reducing tank is communicated with the desulfurizing agent tank, the lower part of the reducing tank is communicated with the lower part of the reducing tank, and the reducing tank is provided with a sedimentation tank, a controller, a pH on-line detector and a liquid level meter which are arranged in the liquid storage tank; the outlet end of the fluid infusion pump is communicated with the fluid infusion port through a fluid infusion electromagnetic stop valve; the inner tube includes: the large end of the upper frustum body is positioned at the lower end of the lower frustum body, and the large end of the lower frustum body is positioned at the upper end of the lower frustum body and connected with the large end of the upper frustum body; the upper frustum body and the lower frustum body are coaxially arranged, and the diameter of the large end of the upper frustum body is equal to that of the large end of the lower frustum body; the flue gas nozzle is opposite to the outer side wall of the upper frustum body; the wind wheel is in threaded connection with the outer side wall of the upper frustum body;
the wind wheel drives the inner cylinder to rotate under the action of rising smoke, so that the smoke is uniformly distributed between the outer cylinder and the inner cylinder to rise;
the air ejected from the air nozzle group reduces the desulfurizing agent.
2. The reduction cycle desulfurization apparatus according to claim 1, characterized in that said reduction tank comprises: the device comprises a mounting plate arranged at the upper end of a reduction tank, a heater arranged at the lower end of the reduction tank, a motor connected with the upper end of the mounting plate, a driving gear connected with an output shaft of the motor, a hollow main shaft pivoted with the mounting plate, a driven gear connected with the hollow main shaft and meshed with the driving gear, a rotary joint with the lower end connected with the upper end of the hollow main shaft, an aeration fan with the upper end of the rotary joint at the outlet end, a sun gear sleeved outside the hollow main shaft and connected with the lower end of the mounting plate, at least one main aeration device arranged at the lower part of the hollow main shaft, and a plurality of auxiliary aeration devices circumferentially distributed along the hollow main shaft; the main aeration device comprises: a plurality of main stirring pipes provided with main aeration nozzle groups, the inner ends of which are connected with the outer periphery of the hollow main shaft; the secondary aeration device includes: the inner end of the planetary gear is connected with the outer side wall of the hollow main shaft, the connecting sleeve is connected with the outer end of the connecting sleeve, the hollow auxiliary shaft is pivoted with the connecting sleeve, the planetary gear is connected with the upper end of the hollow auxiliary shaft and meshed with the sun gear, and the planetary gear is provided with a plurality of auxiliary stirring pipes which are provided with auxiliary aeration nozzle groups and the inner end of which is connected with the outer side wall of the hollow auxiliary shaft; the inner hole of the main stirring pipe is communicated with the inner hole of the hollow main shaft; the inner hole of the auxiliary stirring pipe, the inner hole of the hollow auxiliary shaft and the inner hole of the connecting pipe are sequentially communicated and communicated with the inner hole of the hollow main shaft.
3. The reductive circulation desulfurization apparatus of claim 1, wherein said desulfurization tower further comprises: the flushing spraying device is arranged above the demister; the sedimentation tank is provided with a flushing pump; the outlet end of the flushing pump is communicated with the flushing spraying device.
4. The reduction cycle desulfurization apparatus according to claim 3, characterized in that said flushing shower apparatus comprises: and a plurality of flushing pipe rings which are coaxially arranged with the inner cylinder and provided with flushing nozzle groups at the lower side are arranged on flushing connecting pipes which penetrate through the side wall of the outer cylinder and are communicated with the flushing pipe rings and the outlet ends of the flushing pump in one-to-one correspondence.
5. The reductive circulation desulfurization apparatus of claim 1 or 2, wherein said desulfurization agent spray apparatus comprises: the plurality of desulfurization pipes are distributed along the circumference of the hollow rotary joint, and the lower side of the desulfurization pipes is provided with an atomizing nozzle group; the inner end of the desulfurization pipe is connected with the hollow rotary joint; the inner hole of the desulfurization pipe is communicated with the outlet end of the circulating pump through a hollow rotary joint.
6. The reduction cycle desulfurization apparatus according to claim 1 or 2, characterized in that the demister comprises: and a plurality of defogging rings which are formed by corrugated plates and are coaxially arranged outside the connecting shaft, and supporting frames which are respectively connected with the inner side wall of the outer cylinder, the upper end of the defogging rings and the upper end of the connecting shaft.
7. A desulfurization method of a reduction cycle desulfurization apparatus having the limiting structure of the reduction cycle desulfurization apparatus according to any one of claims 1 to 6, characterized in that,
(1) Smoke of a boiler of the power plant is sprayed out from a smoke nozzle to the outer periphery of the inner cylinder through a smoke inlet annular ring; the desulfurizing agent sprayed from the atomizing nozzle group absorbs sulfur-containing gas in the ascending flue gas, then falls into the liquid storage tank, and is circularly sprayed from the atomizing nozzle group for desulfurization under the action of the circulating pump; demisting the desulfurized flue gas by a demister and discharging the desulfurized flue gas from an exhaust port;
(2) When the pH value of the desulfurizing agent in the liquid storage tank is detected to deviate from a set range by the pH online detector, the controller controls the liquid discharge electromagnetic stop valve to be communicated, the desulfurizing agent in the liquid storage tank flows into the reduction tank, the liquid supplementing electromagnetic stop valve is communicated, and under the action of the liquid supplementing pump, the desulfurizing agent in the desulfurizing agent tank is supplemented into the liquid storage tank, so that the pH value of the desulfurizing agent in the liquid storage tank reaches the set range;
(3) When the liquid level meter detects that the liquid level of the desulfurizing agent in the liquid storage tank is lower than the set height, the controller controls the fluid supplementing electromagnetic stop valve to be communicated, and under the action of the fluid supplementing pump, the desulfurizing agent in the desulfurizing agent tank is supplemented into the liquid storage tank, so that the liquid level of the desulfurizing agent in the liquid storage tank reaches the set height;
(4) The output shaft of the motor drives the main stirring pipe of the main aeration device and the connecting pipe of the auxiliary aeration device to rotate through the driving gear, the driven gear and the hollow main shaft, the connecting pipe drives the hollow auxiliary shaft and the auxiliary stirring pipe to revolve, and the planetary gear meshed with the sun gear drives the hollow stirring pipeThe auxiliary shaft and the auxiliary stirring pipe rotate automatically; under the action of an aeration fan, CO connected with the inlet end of the aeration fan 2 The gas is sprayed out from a main aeration nozzle group of a main aeration device and a secondary aeration nozzle group of a secondary aeration device respectively through a rotary joint and a hollow main shaft, and is mixed with the desulfurizing agent flowing into a reduction tank from a liquid storage tank to carry out reduction reaction, the desulfurizing agent at the upper part of the reduction tank after the reduction reaction flows into a desulfurizing agent tank, and the waste liquid at the lower part of the reduction tank flows into a sedimentation tank;
(5) Under the action of a flushing pump, supernatant liquid at the upper part of the sedimentation tank after sedimentation is sprayed out from a flushing nozzle group of a flushing spray device to flush the demister, and crystals precipitated at the bottom of the sedimentation tank are discharged through a sedimentation outlet.
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