CN113429025A - Aeration device suitable for seawater method flue gas desulfurization aeration tank - Google Patents
Aeration device suitable for seawater method flue gas desulfurization aeration tank Download PDFInfo
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- CN113429025A CN113429025A CN202110794826.XA CN202110794826A CN113429025A CN 113429025 A CN113429025 A CN 113429025A CN 202110794826 A CN202110794826 A CN 202110794826A CN 113429025 A CN113429025 A CN 113429025A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/004—Seals, connections
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses an aeration device suitable for a seawater flue gas desulfurization aeration tank, belonging to the technical field of flue gas desulfurization of thermal power plants and industrial combustion devices, and comprising: the aeration tank is internally provided with at least two layers of aeration branch pipe networks in the depth direction, each layer of aeration branch pipe network is provided with a plurality of aeration branch pipes which are distributed along the seawater flow direction, and each aeration branch pipe provides aeration air for the aeration branch pipe network through an aeration air assembly; the aeration branch pipe networks on each layer are selectively opened or closed according to the height of the tide level so as to achieve the purposes that the aeration fans can normally operate at the average high tide level (and below) and the annual high tide level (1% high tide level), the seawater discharge index is not influenced at the annual high tide level, the seawater can be discharged up to the standard at the annual high tide level and below, the number of the fans and the power of the fans are not required to be increased, and the efficiency of the fans is not reduced.
Description
Technical Field
The invention belongs to the technical field of flue gas desulfurization of thermal power plants and industrial combustion devices, and particularly relates to an aeration device suitable for a seawater flue gas desulfurization aeration tank.
Background
In the flue gas desulfurization process of a thermal power plant and an industrial combustion device by a seawater method, the desulfurized seawater needs to be subjected to water quality recovery treatment, and the recovered seawater can be discharged into the sea only when the quality of the recovered seawater meets the seawater quality standard of a corresponding local category. The seawater quality recovery is mainly carried out in an aeration tank, and air is blown into the aeration tank through an aeration fan to improve the pH value and dissolved oxygen of seawater so as to achieve the purpose of improving the quality of the discharged seawater.
The aeration fan usually adopts a centrifugal blower. The air quantity is related to the quantity of the removed sulfur dioxide and the quality of the seawater needing to be recovered, and is also related to the depth of water in the aeration tank, and is mainly determined by the process. The deeper the water depth of the aeration tank is, the higher the utilization rate of the aeration air is, and the higher the pressure which needs to be provided by the aeration fan for blowing the air into the aeration tank is. When the amount of sulfur dioxide to be removed is determined, the standard of seawater quality to be recovered is determined, and the water depth of the aeration tank is determined, the flow and the pressure of the aeration air are determined.
The utilization rate of aeration air is related to the water depth of the aeration tank, and the water depth of the aeration tank is equal to the difference between the water level elevation and the bottom elevation of the aeration tank. The water level elevation is related to the sea tide level.
Conventionally, the aeration fan is designed to operate at an average high tide level (or average tide level) and below, and the fan is shut down when high tide levels are met for a century. When the water level of the aeration tank is higher than the average high tide level by 60-90% in a hundred-year high tide level (1% high tide level), and the water depth of the aeration tank is higher than the average high tide level by 50-100% in a hundred-year high tide level. The pressure of the aeration fan will be greatly increased due to the rise of the water level in a high tide level for a hundred years. If the aeration fan needs to normally operate at the average high tide level and the high tide level in one hundred years, the type selection of the aeration fan is difficult or the aeration fan cannot be selected, and further, the operating condition has very low efficiency and poor economical efficiency.
Under the normal condition, the aeration fan is stopped when the high tide level is met for a hundred years, under the working condition, the aeration tank is only used as a seawater flowing channel, aeration cannot be carried out, the seawater quality cannot be recovered, the availability of the aeration device is reduced, and the seawater discharge index is influenced.
Disclosure of Invention
In view of the above, in order to solve the above problems in the prior art, the present invention provides an aeration apparatus suitable for a seawater flue gas desulfurization aeration tank, so as to achieve the purposes of enabling an aeration fan to operate normally at an average high tide level (or below) and a one-hundred-year-high tide level (1% high tide level), enabling seawater discharge indexes to be unaffected at the one-hundred-year-high tide level, ensuring that seawater can be discharged up to standard at the one-hundred-year-high tide level and below, and not increasing the number of fans and the power of fans, and not reducing the efficiency of fans.
The technical scheme adopted by the invention is as follows: an aeration device suitable for a seawater method flue gas desulfurization aeration tank, which comprises: the aeration tank is internally provided with at least two layers of aeration branch pipe networks in the depth direction, each layer of aeration branch pipe network is provided with a plurality of aeration branch pipes which are distributed along the seawater flow direction, and each aeration branch pipe provides aeration air for the aeration branch pipe network through an aeration air assembly;
wherein, each layer of aeration branch pipe network is selectively opened or closed according to the height of the tide level, the length, the width and the depth of the aeration tank are designed according to the convention, the aeration device does not need to increase the cost additionally, only one layer of aeration branch pipe network is added, and the cost can be greatly saved.
Further, upper aeration branch pipe networks and lower floor's aeration branch pipe networks have been arranged respectively along its depth direction in the aeration tank, and upper aeration branch pipe network arranges in the middle part degree of depth position of aeration tank, and lower floor's aeration branch pipe network arranges in the high position of 100 ~ 1000mm in the bottom top of aeration tank, through switching upper aeration branch pipe network or lower floor's aeration branch pipe network to aeration in the aeration tank, can be in 1% high tide level and following tide level homoenergetic normal operating in order to realize this aeration equipment.
Furthermore, each branch aeration pipe is provided with a supporting member for providing supporting force for the branch aeration pipe so as to ensure the installation stability of each branch aeration pipe, at least one partition wall is arranged in the aeration tank in parallel, the aeration tank is divided into a plurality of parallel flow channels through each partition wall so as to ensure the uniform distribution of seawater in the aeration tank, and further ensure the uniform aeration of seawater.
Furthermore, each aeration branch pipe is arranged in parallel, and each aeration branch pipe is provided with a valve which can adopt a butterfly valve, so that the opening and closing of each aeration branch pipe can be switched while the aeration balance of each aeration branch pipe is ensured.
Furthermore, each aeration branch pipe is uniformly provided with aeration holes, the diameter of each aeration hole is set to be phi 3-phi 10mm, so that aeration is carried out through the aeration holes of each aeration branch pipe, and the aeration device has the advantages of no blockage, constant aeration capacity, stable aeration effect and no maintenance basically.
Further, the aeration wind assembly includes: the aeration main pipe is connected with the aeration branch pipes, the aeration branch pipes are connected out of the same aeration main pipe in a staggered mode and located on different layers, the aeration branch pipes share the aeration fan and the aeration main pipe through an upper layer of aeration branch pipe network and a lower layer of aeration branch pipe network, and the system is simple and saves cost.
Further, the aeration tank is divided into one or more water flow sections along the seawater flow direction, and the aeration air assembly comprises: the number of the aeration main pipes is the same as that of the water flow sections, each aeration main pipe is connected with each aeration branch pipe where the corresponding water flow section is located, each aeration main pipe is respectively connected with an aeration air pipe group for supplying aeration air to the aeration main pipe, so that the sectional aeration in the aeration tank is realized, and meanwhile, each aeration branch pipe in the upper-layer aeration branch pipe network and each aeration branch pipe in the lower-layer aeration branch pipe network are arranged in a staggered mode.
Further, aeration tuber pipe group includes the aeration tuber pipe and locates the aeration fan on this aeration tuber pipe, the aeration tuber pipe is connected with the female pipe of aeration, and the aeration fan adopts centrifugal blower and this aeration fan's fan type, quantity, amount of wind, pressure can according to conventional design, and need not to adopt inverter motor, can not increase the cost in addition.
Furthermore, the main aeration pipe is positioned above the liquid level of the aeration tank and is made of carbon steel or FRP; and the aeration branch pipe networks of all layers are uniformly distributed in the aeration tank, and the aeration branch pipes of the aeration branch pipe networks are made of FRP (fiber reinforced plastic) so as to ensure that the aeration main pipe and the aeration branch pipes have enough durability.
Further, the front section, the middle section and the rear section of the aeration tank are respectively a mixing zone, an aeration zone and a drainage zone, the mixing zone is communicated with an original seawater discharge pipe and an acid seawater discharge pipe, and the acid seawater discharge pipe is connected with an acid seawater distributor arranged in the mixing zone; each layer of aeration branch pipe network is arranged in the aeration zone; the seawater in the aeration zone enters the drainage zone through overflow or submerged flow, a wall weir is arranged between the drainage zone and the aeration zone, and the drainage zone is provided with a seawater discharge pipe. The acid seawater distributor is arranged at the bottom of the aeration tank in the width direction, a concrete pipe or an FRP pipe is adopted, and a plurality of holes are formed in the acid seawater distributor so as to enable acid seawater to flow out of the mixing area through the holes; the seawater flow channel from the absorption tower to the mixing zone enters from the middle part or one side or two sides of the mixing zone to ensure that the raw seawater and the acid seawater are fully mixed in the mixing zone.
The invention has the beneficial effects that:
1. by adopting the upper and lower layers of aeration branch pipe networks, the seawater desulfurization device can normally operate at high tide level, average high tide level and below tide level all the year round, ensures the seawater discharge index of seawater desulfurization at high tide level and below tide level all the year round, improves the application range of the aeration device, minimizes the influence on oceans and marine organisms, does not need to increase the number of aeration fans and the power of the aeration fans, does not reduce the efficiency of the fans, and has the advantages of simple system, low cost, energy conservation and no maintenance basically.
Drawings
FIG. 1 is a schematic diagram of the overall system structure of an aeration device suitable for a seawater flue gas desulfurization aeration tank provided by the invention;
FIG. 2 is a schematic top view of FIG. 1;
FIG. 3 is a schematic sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic diagram of the arrangement structure of an upper aeration branch pipe network in the aeration device suitable for the seawater flue gas desulfurization aeration tank provided by the invention;
FIG. 5 is a schematic sectional view taken along line B-B of FIG. 4;
FIG. 6 is a schematic cross-sectional view taken along line C-C of FIG. 4;
FIG. 7 is a schematic view of the arrangement structure of the lower layer aeration branch pipe network in the aeration device suitable for the seawater flue gas desulfurization aeration tank provided by the invention;
FIG. 8 is a schematic cross-sectional view taken along line D-D of FIG. 7;
FIG. 9 is a schematic cross-sectional view taken along line E-E of FIG. 7
The drawings are labeled as follows:
1-acid sea discharge pipe, 2-acid sea water distributor, 3-mixing zone, 4-aeration zone, 5-wall weir, 6-drainage zone, 7-aeration fan, 8-aeration mother pipe, 9-upper aeration branch pipe network, 10-lower aeration branch pipe network, 11-valve, 12-raw sea water discharge pipe, 13-sea water discharge pipe, 14-support member and 15-aeration tank flow channel partition wall.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, cannot be understood as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; the drawings in the embodiments are used for clearly and completely describing the technical scheme in the embodiments of the invention, and obviously, the described embodiments are a part of the embodiments of the invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
In the embodiment, the aeration device suitable for the seawater flue gas desulfurization aeration tank is provided, mainly aiming at ensuring that the seawater desulfurization process can normally aerate all the aeration tanks at high tide levels and below in one hundred years, and is suitable for coastal thermal power plants and industrial combustion devices adopting the seawater desulfurization process in practical application, in particular to large coal-fired, oil-fired and gas-fired power plants or self-contained power plants adopting the seawater flue gas desulfurization process.
As shown in fig. 1 to 9, the main parts of the aeration apparatus are: aeration tank opens the structure for the concrete with whole aeration tank, is mixing area 3, aeration zone 4 and drainage area 6 respectively with aeration tank coastal waters forward section, middle section and back end.
(1) For the mixing zone 3 part: the mixing zone 3 is communicated with an original seawater discharge pipe 12 (a concrete channel or an FRP pipeline) and an acid seawater discharge pipe (a concrete channel or an FRP pipeline), and the acid seawater discharge pipe is connected with an acid seawater distributor 2 arranged in the mixing zone 3. The raw seawater from the siphon well or the circulating ditch of the power plant is discharged into the mixing zone 3 at the front part of the aeration zone 4 from the raw seawater through the gravity or pressure flow pipe 12, and is mixed with the acid seawater which is discharged from the bottom of the absorption tower and absorbs the acid substances such as sulfur dioxide in the flue gas in the mixing zone 3, and then flows to the aeration zone 4. The acid seawater discharged from the absorption tower flows into a mixing zone 3 through an acid seawater discharge pipe (a concrete channel or an FRP pipeline), an acid seawater distributor 2 is arranged in the mixing zone 3, the acid seawater distributor 2 is arranged at the bottom of the aeration tank in the width direction, a plurality of holes are formed in the acid seawater distributor 2, the acid seawater flows out through the holes and is naturally mixed with the original seawater, and the number and the diameter of the holes of the acid seawater distributor 2 are determined according to the allowable head loss from the absorption tower to the mixing zone 3.
(2) For aeration zone 4 part: at least two layers of aeration branch pipe networks are arranged in the depth direction of the aeration tank, each layer of aeration branch pipe network is provided with a plurality of aeration branch pipes which are arranged along the seawater flow direction, and each aeration branch pipe provides aeration air for the aeration branch pipe network through an aeration air assembly. Wherein, aeration wind subassembly includes: the aeration main pipe 8 is connected with the aeration main pipe 8 after being connected in parallel, the aeration main pipe 8 is connected with the aeration branch pipes, and the aeration branch pipes positioned on different layers are arranged in a staggered mode. The aeration air pipe group comprises an aeration air pipe and an aeration fan 7 arranged on the aeration air pipe, the aeration air pipe is connected with an aeration main pipe 8, when the aeration fan 7 works, enough aeration air is supplied for the aeration air pipe, the aeration device of one set of aeration tank is provided with 1-4 aeration fans 7, the aeration fans 7 are provided with centrifugal blowers and non-variable frequency motors, and manual or electric adjusting air doors are arranged at the inlet and outlet of the aeration fans 7 as required to control the aeration air quantity of the aeration fans 7.
In practical application, an upper layer aeration branch pipe network 9 and a lower layer aeration branch pipe network 10 are respectively arranged in the aeration tank along the depth direction, the upper layer aeration branch pipe network 9 is arranged at the middle depth position of the aeration tank, and corresponding setting is specifically carried out according to the height of 1% high tide level water level in the aeration tank. The lower layer aeration branch pipe network 10 is arranged at a position 100-1000 mm above the bottom of the aeration tank, and is mainly used for effectively aerating the aeration zone 4 of the aeration tank when the lower layer aeration branch pipe network is applied to the average high tide level and the lower tide level; it should be noted that the upper and lower layers of aeration branch pipe networks are designed in the same way except that the installation height and the position are different.
As shown in fig. 2 and 3, in order to ensure that each aeration branch pipe can be stably installed in the aeration zone 4 and to ensure smooth aeration in the aeration zone 4, a support member 14 for providing a supporting force to each aeration branch pipe is arranged, one end of each support member 14 is fixed to the bottom of the aeration tank, and the other end is fixed to each corresponding aeration branch pipe.
As shown in fig. 2, at least one partition wall is disposed in parallel in the aeration tank, and the aeration tank is divided into a plurality of parallel flow paths by the respective partition walls. In practical application, a partition wall is arranged in the middle of the aeration tank and is positioned in the flowing direction of the seawater, and the internal flow channel of the aeration tank is divided into two parts by the partition wall so as to ensure that the seawater is uniformly distributed in the aeration tank. Of course, one or more flow channels can be arranged according to the width of the aeration tank, each flow channel is separated by a partition wall, and the height of the partition wall is below the liquid level height so as to ensure that the seawater is uniformly distributed in the aeration tank.
In practical application, in order to ensure the reliability of the operation of the main aeration pipe 8 and the branch aeration pipes, in this embodiment, a common aeration mode is adopted, a plurality of aeration fans 7 share one main aeration pipe 8, each branch aeration pipe is a plurality of pipelines connected from the main aeration pipe 8, each branch aeration pipe in the upper-layer branch aeration pipe network 9 is arranged in parallel with each branch aeration pipe in the lower-layer branch aeration pipe network 10, and each branch aeration pipe is provided with a valve 11, so that the opening or closing of each branch aeration pipe network is realized through the opening and closing of the valve 11.
The main aeration pipe 8 is positioned at the side part above the liquid level of the aeration tank, the main aeration pipe 8 is made of carbon steel or FRP, and the main aeration pipe 8 made of the material has the advantage of durability; each layer the aeration branch pipe network equipartition is arranged in the aeration tank and the aeration branch pipe of aeration branch pipe network adopts FRP to make, in upper aeration branch pipe network 9 and lower floor's aeration branch pipe network 10, evenly set up a plurality of aeration hole and the diameter of aeration hole on each aeration branch pipe and establish to phi 3 ~ phi 10mm, the air of aeration fan 7 export flows from each aeration hole, under the effect in aeration hole, can realize carrying out quick, effectual aeration to the sea water in aeration district 4.
(3) For the drainage area 6 section: the method comprises the steps that raw seawater and acid seawater are uniformly mixed and then flow to an aeration tank under the action of gravity, the seawater flows to a drainage area 6 on the rear end side of the aeration area 4 through the gravity after being aerated in the aeration area 4, a wall weir 5 is arranged between the drainage area 6 and the aeration area 4, a seawater discharge pipe 13 is arranged on the drainage area 6, as the vertical thin-wall weir 5 is arranged between the aeration area 4 and the drainage area 6, no hole is formed in the wall and is used for maintaining the water depth required by aeration in the aeration area 4, seawater in the aeration tank overflows or submerges and flows into the drainage area 6, the seawater flows out of an outlet channel of the drainage area 6 and finally flows to the sea.
Based on the aeration device suitable for the seawater method flue gas desulfurization aeration tank, when the aeration device works, each layer of aeration branch pipe network is selectively opened or closed according to the height of the tide level, and the aeration device comprises the following components:
when the average high tide level is lower than the average high tide level, the valves 11 on the aeration branch pipes in the lower aeration branch pipe network 10 are opened, the valves 11 on the aeration branch pipes in the upper aeration branch pipe network 9 are closed, and the air at the outlet of the aeration fan 7 flows out from the aeration holes on the aeration branch pipes in the lower aeration branch pipe network 10 and enters the aeration area 4 to aerate the seawater in the aeration area 4.
At 1% high tide level, opening the valves 11 on the aeration branch pipes in the upper layer aeration branch pipe network 9, closing the valves 11 on the aeration branch pipes in the lower layer aeration branch pipe network 10, and making all the air at the outlet of the aeration fan 7 flow out from the aeration holes on the aeration branch pipes in the upper layer aeration branch pipe network 9, enter the aeration zone 4 and aerate the seawater in the aeration zone 4.
Example 2
The aeration device suitable for the aeration tank of the seawater flue gas desulfurization provided in example 1 adopts a common aeration mode, and in this example, the aeration device works and comes from a thermal power plant or an industrial combustion device and contains SO2The flue gas is washed by seawater in a desulfurization absorption tower to wash SO2The acid seawater is converged at the bottom of the absorption tower, discharged from a seawater port at the bottom of the absorption tower, and flows into a mixing zone 3 of an aeration tank in the aeration device by gravity.
On the other hand, raw seawater from a siphon well or a circulation ditch of a power plant flows into a mixing zone 3 at the inlet of an aeration device by gravity or pressure, and after being mixed with sour seawater discharged from the bottom of an absorption tower in the mixing zone 3, the seawater is aerated in an aeration zone 4 and flows to a drainage zone 6 at the outlet of the aeration device by gravity. Wherein, former sea water flows into mixing area 3 through concrete channel or FRP pipeline, and under the condition of permitting, the condition is as far as possible from mixing area 3's width direction's middle part entering, is convenient for former sea water and sour sea water to mix more evenly.
In this embodiment, different from embodiment 1, the aeration tank is provided with a staged aeration mode, the number of aeration mother pipes 8 is the same as that of the aeration air pipe groups, and the air from one aeration air pipe group corresponds to the aeration of a section of the aeration tank in the length direction. The following were used: divide aeration tank into water flow section, well water flow section and back water flow section along the seawater flow direction, the aeration wind subassembly includes: the number of the aeration main pipes 8 is the same as that of the water flow sections (namely, 3 independent aeration main pipes 8), each aeration main pipe 8 is connected with each aeration branch pipe where the corresponding water flow section is located (namely, each aeration branch pipe in the area where the front water flow section is located (including the aeration branch pipe located in the upper layer aeration branch pipe network 9 and the aeration branch pipe located in the lower layer aeration branch pipe network 10) is connected to one aeration main pipe 8, each aeration branch pipe in the area where the middle water flow section is located is connected to one aeration main pipe 8, each aeration branch pipe in the area where the rear water flow section is located is connected to one aeration main pipe 8, each aeration main pipe 8 is respectively connected with an aeration air pipe group for supplying aeration air to the aeration main pipe 8, and the aeration air pipe groups are used for supplying enough aeration air to the corresponding aeration main pipes 8. The composition of the aeration blast pipe group is described in example 1, and is not described herein.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (10)
1. An aeration device suitable for a seawater method flue gas desulfurization aeration tank is characterized by comprising: the aeration tank is internally provided with at least two layers of aeration branch pipe networks in the depth direction, each layer of aeration branch pipe network is provided with a plurality of aeration branch pipes which are distributed along the seawater flow direction, and each aeration branch pipe provides aeration air for the aeration branch pipe network through an aeration air assembly;
wherein, each layer of aeration branch pipe network is selectively opened or closed according to the height of the tide level.
2. An aeration device suitable for a seawater flue gas desulfurization aeration tank according to claim 1, wherein an upper aeration branch pipe network and a lower aeration branch pipe network are respectively arranged in the aeration tank along the depth direction thereof, the upper aeration branch pipe network is arranged at the middle depth position of the aeration tank, and the lower aeration branch pipe network is arranged at the position 100-1000 mm above the bottom of the aeration tank.
3. An aeration apparatus according to claim 1, wherein each of said branch aeration pipes is provided with a support member for providing a supporting force thereto, and at least one partition wall is disposed in parallel in the aeration tank, and the aeration tank is divided into a plurality of parallel flow paths by the respective partition walls.
4. An aeration device according to claim 1, wherein each branch aeration pipe is arranged in parallel and is provided with a valve.
5. An aeration apparatus according to claim 1, wherein each of said aeration branch pipes is provided with aeration holes uniformly, and the diameter of each aeration hole is set to be 3 to 10 mm.
6. An aeration device suitable for a seawater flue gas desulfurization aeration tank according to claim 1, wherein the aeration air assembly comprises: the aeration main pipe is connected with the aeration branch pipes, and the aeration branch pipes positioned on different layers are arranged in a staggered manner.
7. An aeration device suitable for a seawater flue gas desulfurization aeration tank according to claim 1, wherein the aeration tank is divided into one or more water flow sections along the seawater flow direction, and the aeration air assembly comprises: the number of the aeration main pipes is the same as that of the water flow sections, each aeration main pipe is connected with each aeration branch pipe where the corresponding water flow section is located, and each aeration main pipe is respectively connected with an aeration air pipe group for supplying aeration air to the aeration main pipe.
8. An aeration device suitable for a seawater flue gas desulfurization aeration tank according to claim 6 or 7, wherein the aeration air pipe set comprises an aeration air pipe and an aeration fan arranged on the aeration air pipe, and the aeration air pipe is connected with an aeration main pipe.
9. The aeration device suitable for the seawater flue gas desulfurization aeration tank, according to claim 1, wherein the main aeration pipe is located above the liquid level of the aeration tank, and is made of carbon steel or FRP; and the aeration branch pipe networks of all the layers are uniformly distributed in the aeration tank, and the aeration branch pipes of the aeration branch pipe networks are made of FRP.
10. The aeration device suitable for the seawater flue gas desulfurization aeration tank according to claim 1, wherein the front section, the middle section and the rear section of the aeration tank are respectively a mixing zone, an aeration zone and a drainage zone, the mixing zone is communicated with an original seawater discharge pipe and an acid seawater discharge pipe, and the acid seawater discharge pipe is connected with an acid seawater distributor arranged in the mixing zone; each layer of aeration branch pipe network is arranged in the aeration zone; a wall weir is arranged between the drainage area and the aeration area, and the drainage area is provided with a seawater discharge pipe.
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