CN113842712B - Demister support with cleaning function, water supplementing system and water supplementing method - Google Patents
Demister support with cleaning function, water supplementing system and water supplementing method Download PDFInfo
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- CN113842712B CN113842712B CN202110942766.1A CN202110942766A CN113842712B CN 113842712 B CN113842712 B CN 113842712B CN 202110942766 A CN202110942766 A CN 202110942766A CN 113842712 B CN113842712 B CN 113842712B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention belongs to the technical field of waste incineration, and particularly relates to a demister support with a cleaning function, a water supplementing system and a water supplementing method, wherein the demister support comprises an upper support part, a lower support part, a plurality of connecting pipes, a water inlet pipeline, a fixing part, a plurality of first atomizing nozzles and a plurality of second atomizing nozzles; the demister support has small structural resistance and low cost, and can effectively reduce the crystallization and scaling risks of the demister; according to the invention, the demister washes water supplement required by normal operation of the wet tower, the washing is completed when the water supplement is used, the water supplement is carried out while the washing is carried out, and the additional operation cost is not increased; according to the invention, the water supplementing quantity of the wet tower is calculated through the inlet flue gas introduction quantity, the flue gas temperature and the water content to obtain the water quantity evaporated by the flue gas, and then the water supplementing is carried out by controlling the remote regulating valve, so that the water supplementing in advance is realized, the water supplementing hysteresis is avoided, and the stability of the operation liquid level of the wet tower is ensured.
Description
Technical Field
The invention belongs to the technical field of waste incineration, and particularly relates to a demister support with a cleaning function, a water supplementing system and a water supplementing method.
Background
At present, in the operation process of a wet deacidification system, sulfur dioxide, hydrogen chloride and other acidic gases in flue gas can be absorbed into wet slurry by an alkaline absorbent to form a corresponding salt solution. As the absorption reaction proceeds, the salt concentration in the slurry gradually increases, and crystallization is likely to occur. Especially in areas such as the defroster bottom that the thick liquid velocity of flow is slower, the thick liquid is accumulated easily, and under the evaporation promotion effect of high temperature flue gas, crystallization, scale deposit phenomenon are comparatively obvious, lead to defroster and grid to block up easily, and the pressure drop increase in the tower, and then arouse draught fan power consumption cost to increase, and deacidification, defogging effect weaken. Therefore, the demister and the grid need to be washed and cleaned to ensure the stable operation of the demister and the grid.
When the wet deacidification system is in operation, high-temperature unsaturated flue gas entering the tower can evaporate part of wet slurry in gas-liquid contact, the slurry concentration is increased, and meanwhile, the liquid level in the tower is reduced, so that the cavitation of a circulating pump is easily caused. In order to ensure that the amount of the slurry in the tower is kept stable, timely water supplement is needed. In the prior art, the water replenishing of a wet method system is mainly based on the liquid level in the tower, and when the liquid level drops to a preset liquid level, the process water is replenished to a slurry area at the bottom of the wet method tower. However, the method does not fully utilize the part of the water supplement, and has certain hysteresis, particularly when the temperature of the flue gas is suddenly increased, the liquid level is reduced at an excessively high speed, and the water supplement is not timely, so that the cavitation of the circulating pump is easily caused.
Disclosure of Invention
The invention provides a demister supporting piece with a cleaning function, a water supplementing system and a water supplementing method, which can be used for supplementing water of slurry to clean a demister and a grating, and meanwhile, water supplementing control is based on the inlet flue gas volume, the flue gas temperature and the water content data of a wet system, and evaporation water volume is calculated to realize pre-water supplementing, so that the stability of the operating liquid level in a wet tower is guaranteed.
The technical scheme adopted by the invention for solving the technical problems is as follows: a demister support having a cleaning function, the demister support being installed below a demister inside a wet process tower, the demister support comprising:
the upper supporting part is of a hollow circular structure and is in contact with the bottom of the demister;
the lower supporting part is of a hollow circular structure, is arranged below the upper supporting part and is in contact with the inner wall of the wet process tower;
the connecting pipes are arranged between the upper supporting part and the lower supporting part at equal intervals and communicate the upper supporting part with the lower supporting part;
the first atomizing nozzles are vertically and upwards arranged at the connecting pipe close to the upper supporting part towards the demister;
the second atomizing nozzles are vertically and upwards arranged at the connecting pipe close to the lower supporting part towards the demister;
and one end of the water inlet pipeline is connected with the lower supporting part, and the other end of the water inlet pipeline extends to the external environment along the horizontal plane and is connected with the process water.
As a further preferred aspect of the present invention, the outer diameter of the upper support part is smaller than the inner diameter of the lower support part.
As a further preferred aspect of the present invention, the inner diameter of the outlet of the plurality of second atomizing nozzles is larger than the inner diameter of the outlet of the plurality of first atomizing nozzles.
As a further preferable mode of the invention, the wet tower further comprises a plurality of fixing pieces, the plurality of fixing pieces are fixed on the inner wall of the wet tower, and the lower support part is erected on the plurality of fixing pieces.
As a further preference of the present invention, a plurality of said first atomizing nozzles spray at an angle ranging from 120 ° to 150 °.
As a further preference of the present invention, a plurality of said second atomizing nozzles spray at an angle ranging from 90 ° to 120 °.
Still provide a water charging system who contains defroster support piece that possesses cleaning function, including flue gas pipeline, flue gas volume detection device, first thermometer, hygrometer, level gauge, second thermometer, remote control valve 6 and controller, wherein:
the flue gas conveying pipeline is communicated with the inlet flue of the wet tower;
the flue gas quantity detection device is arranged on the flue gas conveying pipeline and is used for detecting the flue gas quantity at the inlet of the wet process tower;
the first thermometer is arranged on the flue gas conveying pipeline and used for detecting the temperature of the flue gas at the inlet of the wet process tower;
the hygrometer is arranged on the flue gas conveying pipeline and used for detecting the moisture content of the flue gas at the inlet of the wet tower;
the liquid level meter is used for detecting the liquid level height of a slurry area at the bottom of the wet method tower;
the second thermometer is used for detecting the temperature of the circulating slurry of the wet tower;
the remote regulating valve is arranged between the water inlet pipeline and the process water and is used for controlling when the process water is introduced into the wet tower and the flow rate of the introduced process water;
the controller respectively controls the smoke volume detection device, the first thermometer, the hygrometer, the liquid level meter, the second thermometer and the remote regulating valve.
The water replenishing method comprises the following specific steps:
step S1, operating the wet deacidification system;
step S2, the liquid level meter detects the liquid level height of the slurry area at the bottom of the wet tower in real time and feeds the liquid level height back to the controller; the second thermometer detects the temperature of the circulating slurry of the wet tower in real time and feeds the temperature back to the controller;
step S3, introducing flue gas into the wet tower;
step S4, the flue gas quantity detection device, the first thermometer and the hygrometer respectively start to detect the wet process tower inlet flue gas flow, the wet process tower inlet flue gas temperature and the wet process tower inlet flue gas water content and feed back the detected values to the controller;
step S5, calculating and obtaining the water volume V evaporated by the flue gas according to the information fed back to the controller by the liquid level meter, the second thermometer, the flue gas volume detection device, the first thermometer and the hygrometer, wherein the water volume V evaporated by the flue gas is the water supplement volume;
step S6, the controller controls the remote regulating valve to open, and water is supplemented into the wet tower; meanwhile, the controller obtains the opening time T of the remote regulating valve according to the process water flow rate controlled by the remote regulating valve and the water supplementing amount calculated in the step S5;
and step S7, when the opening time of the remote regulating valve reaches T, the controller controls the remote regulating valve to close.
As a further preferred embodiment of the present invention, in the step S7, in a time period when the opening time of the remote control valve does not reach T, the liquid level meter detects that the liquid level in the slurry region exceeds the maximum liquid level, and feeds back information to the controller, and the controller controls the remote control valve to close in advance.
Further preferably, the present invention further includes step S8;
step S8, demister cleaning
Step S8-1, setting the time length of opening the remote regulating valve when the controller is used for carrying out a cleaning process;
step S8-2, when the pressure drop of the wet tower changes greatly, the controller controls the remote regulating valve to open to carry out a cleaning process, which is a first cleaning, wherein:
the cleaning process comprises the specific steps that process water enters the lower supporting part from the water inlet pipeline and then is sprayed out from the first atomizing nozzles and the second atomizing nozzles through the connecting pipes to clean the demister;
step S8-3, after the first cleaning in the step S8-2, when the pressure drop change of the wet tower is stable, the cleaning of the demister is finished;
when the pressure drop change of the wet tower is still large, repeating the cleaning process in the step S8-2, wherein the cleaning process is a second cleaning;
step S8-4, after the second cleaning in step S8-3, when the pressure drop change of the wet tower is stable, the cleaning of the demister is finished;
when the pressure drop change of the wet tower is still large, repeating the cleaning process in the step S8-2, wherein the cleaning process is a third cleaning;
step S8-5, after the third cleaning in step S8-4, when the pressure drop change of the wet tower is stable, the cleaning of the demister is finished;
and when the pressure drop change of the wet tower is still large, the wet tower needs to be subjected to comprehensive fault detection.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the demister supporting piece with the cleaning function has small structural resistance and low cost, and can effectively reduce the crystallization and scaling risks of the demister;
2. according to the invention, the demister washes water supplement required by normal operation of the wet tower, the washing is completed when the water supplement is used, the water supplement is carried out while the washing is carried out, and the additional operation cost is not increased;
3. according to the invention, the water supplementing quantity of the wet tower is calculated through the inlet flue gas introduction quantity, the flue gas temperature and the water content to obtain the water quantity evaporated by the flue gas, and then the water supplementing is carried out by controlling the remote regulating valve, so that the water supplementing in advance is realized, the water supplementing hysteresis is avoided, and the stability of the operation liquid level of the wet tower is ensured.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of an overall construction of a water replenishment system of the present invention including a demister support having a cleaning function;
FIG. 2 is a schematic view of the overall construction of a demister support of the present invention;
FIG. 3 is a top view of a demister support of the present invention.
In the figure: 1. a smoke gas detector; 2. a first thermometer; 3. a hygrometer; 4. a liquid level meter; 5. a second thermometer; 6. a remote regulating valve; 7. a demister support; 8. a grid plate; 9. a packing type demister; 10. a fixing member; 11. a demisting area; 12. a spray layer; 13. a slurry zone; 14. a delivery conduit; 15. a circulation pump; 16. an inlet flue; 17. an outlet flue; 18. an upper support section; 19. a lower support section; 20. a connecting pipe; 21. a water inlet conduit; 22. a first atomizing nozzle; 23. a second atomizing nozzle.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper side", "lower side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the designated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that the terms "first", "second", and the like do not indicate a degree of importance to the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
Example 1
In the prior art, in a wet process mainly based on limestone-gypsum desulphurization, a folded plate demister or a wire mesh demister is generally adopted for flue gas demisting. However, the fluctuation of the waste incineration flue gas amount is large, the running gas speed of the folded plate demister is difficult to meet, and the high chloride ion content in the slurry obviously corrodes the metal wire mesh, so that the filler type demister 9 is frequently used. In practical application, the metal beam is additionally arranged in the wet tower, and the surface of the metal beam is coated with the anti-corrosion coating for supporting the filler type demister 9, so that the method is high in cost.
The invention relates to a wet tower, wherein an inner cavity of the wet tower is sequentially provided with a slurry area 13, a spraying layer 12 and a demisting area 11 from bottom to top, wherein:
the slurry area 13 is positioned at the bottom of the wet method tower and is used for storing slurry; the spraying layer 12 is positioned in the middle of the wet tower, and the spraying layer 12 is a plurality of nozzles spraying towards the slurry area 13; above-mentioned defogging zone 11 is located wet process tower upper portion, stores up defogging zone 11 and includes packing type defroster 9 and grid plate, and packing type defroster 9 bottom is provided with the grid plate, and packing type defroster 9 is arranged in intercepting the liquid drop in the flue gas, realizes the defogging function, and the grid plate is used for preventing dropping of packing.
The liquid required by the spraying layer 12 is liquid in the slurry area 13, the slurry area 13 is connected with a water inlet of the spraying layer 12 through a conveying pipeline 14, a circulating pump 15 is arranged at the end, close to the slurry area 13, of the conveying pipeline 14, the slurry in the slurry area 13 is conveyed to the spraying layer 12, and then the spraying layer 12 sprays the slurry area 13, so that circulation is formed.
An inlet flue 16 is arranged on the outer side wall of the wet method tower, and the position of the inlet flue 16 is higher than the slurry liquid level of the slurry area 13; an outlet flue 17 is arranged at the top of the wet tower; the wet tower is also provided with a pressure drop detector which monitors the pressure drop change of the wet tower in real time.
During operation of the wet deacidification system, flue gas enters the wet tower from an inlet flue 16 arranged on the side wall of the bottom of the wet tower, moves from bottom to top and is in reverse contact with absorption slurry sprayed by the spraying layer 12, and acidic pollutants in the flue gas are absorbed into liquid drops to realize flue gas deacidification. Then the flue gas passes through a filler type demister 9, small liquid drops carried in the flue gas are intercepted, and the flue gas is discharged from a top outlet flue 17.
Based on the above wet tower, as shown in fig. 1 and fig. 2, this embodiment provides a preferred embodiment, a demister support 7 having a cleaning function, which is used to solve the problem of high cost caused by no support piece for a demister or by additionally arranging a metal cross beam in the wet tower in the prior art.
Above-mentioned defroster support piece 7 is installed in grid plate below, and preferably, defroster support piece 7 can adopt glass steel, can satisfy the inside anticorrosive and reduce cost's of wet process deacidification system demand. The demister support 7 comprises an upper support portion 18, a lower support portion 19, a plurality of connecting pipes 20 and a water inlet duct 21, wherein:
the upper supporting part 18 is a hollow circular structure, and contacts with the bottom of the grid plate; the lower support part 19 is a hollow circular structure, is arranged below the upper support part 18, and is contacted with the inner wall of the wet process tower; the plurality of connecting pipes 20 are equidistantly arranged between the upper supporting part 18 and the lower supporting part 19, and the plurality of connecting pipes 20 communicate the upper supporting part 18 with the lower supporting part 19; the water inlet pipe 21 has one end connected to the lower support 19 and the other end extending from the inside of the wet tower to the outside environment along the horizontal plane and connected to the process water.
The embodiment further comprises a plurality of fixing pieces 10, the plurality of fixing pieces 10 are fixed on the inner wall of the wet process tower, and the lower support part 19 is erected on the plurality of fixing pieces 10. The demister support 7 is supported by a plurality of fixing members 10, and the packed demister 9 is supported by the demister support 7.
In the prior art, an annular water distributor can be used based on the requirement of uniform water supplement in sewage treatment, but the annular water distributor has limited bearing capacity and no supporting function, and cannot support the packing type demister 9. Simultaneously, if the annular water-locator is used for the cleanness of packing type defroster 9 and grid tray, because lack the atomizing diffusion distance between nozzle and the packing type defroster 9, clean effect is limited.
In order to solve the above problem, further, the present embodiment further includes a plurality of first atomizing nozzles 22 and a plurality of second atomizing nozzles 23, the first atomizing nozzles 22 are vertically and upwardly arranged at the connecting pipe 20 near the upper support portion 18 toward the filler type demister 9; the second atomizing nozzle 23 is provided at the connecting pipe 20 near the lower support 19 vertically upward toward the stuffing type demister 9. The outer diameter of the upper support part 18 is smaller than the inner diameter of the lower support part 19, that is, the connecting pipes 20 are obliquely arranged between the upper support part 18 and the lower support part 19, and the upper support part 18, the connecting pipes 20 and the lower support part 19 form a circular truncated cone-shaped structure. Therefore, the first atomizing nozzles 22 and the second atomizing nozzles 23 are arranged on the connecting pipes 20, the first atomizing nozzles 22 and the second atomizing nozzles 23 are separated from the bottom of the packing type demister 9 by a certain distance, the atomizing diffusion distance is guaranteed, and the packing type demister 9 is sufficiently cleaned.
A horizontal section is cut below the packing type demister 9, and the flue gas flow speed in the center of the section is high, and the edge flow speed is low, so that the edge of the packing type demister 9 is easy to scale. In response to this problem, a plurality of second atomizing nozzles 23, which are located further away from the central region, require a greater flow rate of process water than a plurality of first atomizing nozzles 22, which are located closer to the central region. In this embodiment, therefore, the inner diameter of the outlet of the second plurality of atomizing nozzles 23 is larger than the inner diameter of the outlet of the first plurality of atomizing nozzles 22.
Furthermore, the spraying angles of the first atomizing nozzles 22 range from 120 degrees to 150 degrees, and the spraying angles of the second atomizing nozzles 23 range from 90 degrees to 120 degrees; the plurality of first atomizing nozzles 22 are closer to the bottom of the filler type demister 9 than the plurality of second atomizing nozzles 23, that is, the injection angle range of the plurality of first atomizing nozzles 22 is larger than the injection angle range of the plurality of second atomizing nozzles 23, so that the sufficient bottom area of the filler type demister 9 can be covered. The sum of the spraying range of the first atomizing nozzles 22 and the spraying range of the second atomizing nozzles 23 reaches 120-150% of the area of the bottom of the covering filler type demister 9; the sum of the injection range of the first atomizing nozzles 22 and the injection range of the second atomizing nozzles 23 needs to completely cover the bottom area of the packed demister 9 to clean the packed demister 9.
In the prior art, in the normal operation of a wet system, due to the evaporation of high-temperature unsaturated flue gas to slurry, water needs to be added to a wet tower to keep the liquid level stable, and the cavitation of a circulating pump 15 is avoided. However, the existing water replenishing mainly regulates and controls a water replenishing valve according to liquid level change, and in the water replenishing process, process water is mainly replenished to the slurry area 13 through a pipe orifice directly, so that full utilization is not realized.
For solving above-mentioned problem, this embodiment still provides a water charging system who contains defroster support 7 that possesses cleaning function, and this water charging system includes flue gas pipeline 14, flue gas volume detection device, first thermometer 2, hygrometer 3, level gauge 4, second thermometer 5, remote control valve 6 and controller, wherein:
the flue gas conveying pipeline 14 is communicated with a wet method tower inlet flue 16, and the flue gas conveying pipeline 14 is used for conveying flue gas to the interior of the wet method tower; the smoke gas quantity detection device is arranged on the smoke gas conveying pipeline 14 and is used for detecting the smoke gas quantity at the inlet of the wet process tower; the first thermometer 2 is arranged on the flue gas conveying pipeline 14 and is used for detecting the temperature of the flue gas at the inlet of the wet tower; the hygrometer 3 is arranged on the flue gas conveying pipeline 14 and is used for detecting the moisture content of the flue gas at the inlet of the wet tower; the liquid level meter 4 is used for detecting the liquid level height of the slurry area 13 at the bottom of the wet method tower; the second thermometer 5 is provided in the transfer pipe 14, and detects the temperature of the slurry circulating in the transfer pipe 14; the remote regulating valve 6 is installed between the water inlet pipeline 21 and the process water, and is used for controlling when the process water is introduced into the wet tower and the flow rate of the introduced process water; the controller respectively controls the smoke volume detection device, the first thermometer 2, the hygrometer 3, the liquid level meter 4, the second thermometer 5, the remote regulating valve 6 and the pressure drop tester.
In this embodiment, the process water passes through water inlet pipeline 21 and lets in defroster support piece 7, then from a plurality of first atomizing nozzle 22 and a plurality of second atomizing nozzle 23 blowout on defroster support piece 7, not only cleans filler type defroster 9 bottom, and the process water falls into the thick liquid district 13 of wet process tower bottom in addition, has realized the moisturizing purpose.
In the prior art, when a wet deacidification system operates, high-temperature unsaturated flue gas entering a tower can evaporate part of wet slurry in gas-liquid contact, the slurry concentration is increased, and meanwhile, the liquid level in the tower is reduced, so that the cavitation of a circulating pump 15 is easily caused. In order to ensure that the amount of the slurry in the tower is kept stable, water needs to be supplemented in time. In the prior art, the water replenishing of a wet system is mainly based on the liquid level in the tower, and after the liquid level is reduced to a preset liquid level, the process water is replenished to a slurry area 13 at the bottom of the wet tower. However, the method does not fully utilize the part of the water supplement, and has certain hysteresis, particularly when the temperature of the flue gas is suddenly increased, the liquid level is reduced too fast, and the water supplement is not timely, so that the circulating pump 15 is easy to generate cavitation.
The embodiment also provides a water replenishing method, and when the slurry area 13 needs water replenishing, the specific steps are as follows:
step S1, operating the wet deacidification system;
step S2, detecting the liquid level height of the wet tower bottom slurry area 13 by the liquid level meter 4 in real time, and feeding back the liquid level height to the controller; meanwhile, the second thermometer 5 detects the temperature of the circulating slurry in the conveying pipeline 14 in real time and feeds the temperature back to the controller;
step S3, introducing flue gas into the wet tower: the flue gas is conveyed to a wet tower inlet flue 16 through a flue gas conveying pipeline 14 and then enters the wet tower;
step S4, detecting the flow rate of the flue gas at the inlet of the wet tower, the temperature of the flue gas at the inlet of the wet tower and the moisture content of the flue gas at the inlet of the wet tower in real time respectively by using a flue gas volume detection device, a first thermometer 2 and a hygrometer 3, and feeding the detected values back to a controller;
step S5, according to information fed back to the controller by the liquid level meter 4, the second thermometer 5, the smoke amount detection device, the first thermometer 2 and the hygrometer 3, because the moisture content of the smoke reaches a saturation state after the smoke passes through the spray layer 12, the water amount V evaporated by the smoke is obtained through water balance calculation, and the water amount V evaporated by the smoke is the water supplement amount;
step S6, the controller controls the remote regulating valve 6 to be opened, and water starts to be supplied into the wet tower; meanwhile, the controller obtains the opening time T of the remote regulating valve 6 according to the process water flow rate controlled by the remote regulating valve 6 and the water supplementing amount calculated in the step S5;
step S7, when the opening time of the remote regulating valve 6 reaches T, the controller controls the remote regulating valve 6 to close, namely the water replenishing work is finished;
in the time period that the opening time of the remote regulating valve 6 does not reach T, the liquid level meter 4 detects that the liquid level of the slurry area 13 exceeds the maximum liquid level, information is fed back to the controller, the controller controls the remote regulating valve 6 to be closed in advance, and water supplementing work is finished.
When the filler type demister 9 needs to be cleaned, the specific steps are as follows:
step S8, washing the packing demister 9
Step S8-1, setting the time length of opening the remote control valve 6 when the controller carries out the primary cleaning process;
step S8-2, when the pressure drop detector detects that the pressure drop of the wet tower changes greatly, the controller controls the remote regulating valve 6 to open to carry out a cleaning process, which is the first cleaning, wherein:
the cleaning process comprises the following specific steps: the remote control valve 6 is opened, the process water enters the lower supporting part 19 from the water inlet pipeline 21, and then the process water is sprayed out from the first atomizing nozzles 22 and the second atomizing nozzles 23 through the connecting pipes 20 to clean the stuffing type demister 9 at regular time;
s8-3, after the first cleaning in the S8-2, when the pressure drop detector detects that the pressure drop change of the wet tower is recovered stably, the cleaning of the packed demister 9 is finished;
when the pressure drop change of the wet tower is still large, repeating the cleaning process in the step S8-2, wherein the cleaning process is a second cleaning;
step S8-4, after the second cleaning in step S8-3, when the pressure drop change of the wet tower is recovered to be stable, the cleaning of the packed demister 9 is finished;
when the pressure drop detector detects that the pressure drop change of the wet tower is still large, repeating the cleaning process in the step S8-2, wherein the cleaning process is the third cleaning;
s8-5, after the third cleaning in the step S8-4, when the pressure drop detector detects that the pressure drop change of the wet tower is recovered stably, the cleaning of the packed demister 9 is finished;
when the pressure drop detector detects that the pressure drop change of the wet tower is still large, the wet tower needs to be subjected to comprehensive fault detection.
After the remote regulating valve 6 of the embodiment receives the water replenishing signal sent by the controller, the opening degree of the remote regulating valve 6 is regulated and controlled. Process water enters the demister supporting piece 7 through the remote control valve 6, is vertically sprayed upwards through the first atomizing nozzle 22 and the second atomizing nozzle 23, washes the bottom of the packing type demister 9, scours crystallization scales at the bottom of the packing type demister 9, and simultaneously, under the entrainment of upward movement flue gas, process water mist drops enter the bottom of the packing type demister 9, so that the slurry concentration at the bottom of the packing type demister 9 is reduced, and the packing type demister 9 is cleaned. During the period, part of process water mist drops can also collide with liquid drops in the flue gas, the demisting efficiency is improved, and the liquid drops formed by convergence enter the bottom slurry area 13 under the action of gravity to complete water supplement to the wet tower.
This embodiment is not increasing extra technology water consumption, when guaranteeing the water balance in the wet process tower, washes filled type defroster 9, prevents scale deposit, crystallization. Atomizing nozzle on the defroster support piece 7 adopts double-deck annular to arrange, and first atomizing nozzle 22 and second atomizing nozzle 23 distinguish according to the difference of atomizing distance, simple structure, and the cost is lower, and the corrosion risk of conventional girder steel structure has been avoided in integral design, has better application prospect.
This embodiment calculates the flue gas evaporation water yield through entry flue gas volume, flue gas temperature and moisture content, then the controller control carries out the moisturizing, has realized moisturizing in advance, avoids delaying the interior liquid level fluctuation of wet process tower that the moisturizing brought, guarantees the continuous stability of liquid level in the wet process tower.
This embodiment can improve 9 defogging efficiency of filler type defroster through moisturizing in 9 bottom atomizing modes of filler type defroster to the wet process tower, improves the moisturizing degree of consistency simultaneously, avoids the direct emergence of the uneven problem of wet process bottom thick liquid concentration that gets into the thick liquid district 13 through the mouth of pipe of process water and leads to.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" in this application is intended to include both the individual and the simultaneous presence of both.
The term "connected" in the present application may mean either a direct connection between the components or an indirect connection between the components through other components.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The utility model provides a defroster support piece that possesses cleaning function, its characterized in that, defroster support piece installs in the inside defroster below of wet process tower, defroster support piece includes:
the upper supporting part is of a hollow circular structure and is in contact with the bottom of the demister;
the lower supporting part is of a hollow circular structure, is arranged below the upper supporting part and is in contact with the inner wall of the wet process tower;
the connecting pipes are arranged between the upper supporting part and the lower supporting part at equal intervals and communicate the upper supporting part with the lower supporting part;
the first atomizing nozzles are vertically and upwards arranged at the connecting pipe close to the upper supporting part towards the demister;
the second atomizing nozzles are vertically and upwards arranged at the connecting pipe close to the lower supporting part towards the demister;
and one end of the water inlet pipeline is connected with the lower supporting part, and the other end of the water inlet pipeline extends to the external environment along the horizontal plane and is connected with the process water.
2. A demister support with a cleaning function as set forth in claim 1, wherein: the outer diameter of the upper support part is smaller than the inner diameter of the lower support part.
3. A demister support with a cleaning function as set forth in claim 2, wherein: and the inner diameter of the outlet of the second atomizing nozzle is larger than that of the outlet of the first atomizing nozzle.
4. A demister support with a cleaning function according to claim 3, wherein: still include a plurality of mounting, it is a plurality of the mounting is fixed wet process tower inner wall, just the lower supporting part erects in a plurality of on the mounting.
5. The demister support having a cleaning function according to claim 4, wherein: the spraying angle range of the first atomizing nozzles is 120-150 degrees.
6. The demister support with a cleaning function of claim 5, wherein: the spraying angle of the second atomizing nozzles ranges from 90 degrees to 120 degrees.
7. A water replenishing system including the demister support having a washing function according to any one of claims 1 to 6, characterized in that: including flue gas pipeline, flue gas volume detection device, first thermometer, hygrometer, level gauge, second thermometer, remote control governing valve and controller, wherein:
the flue gas conveying pipeline is communicated with the inlet flue of the wet tower;
the flue gas quantity detection device is arranged on the flue gas conveying pipeline and is used for detecting the flue gas quantity at the inlet of the wet process tower;
the first thermometer is arranged on the flue gas conveying pipeline and used for detecting the temperature of the flue gas at the inlet of the wet process tower;
the hygrometer is arranged on the flue gas conveying pipeline and used for detecting the moisture content of the flue gas at the inlet of the wet tower;
the liquid level meter is used for detecting the liquid level height of a slurry area at the bottom of the wet method tower;
the second thermometer is used for detecting the temperature of the circulating slurry of the wet tower;
the remote regulating valve is arranged between the water inlet pipeline and the process water and is used for controlling when the process water is introduced into the wet tower and the flow rate of the introduced process water;
the controller respectively controls the flue gas volume detection device, the first thermometer, the hygrometer, the liquid level meter, the second thermometer and the remote regulating valve.
8. The method for replenishing water in a water replenishing system comprising a demister support with a cleaning function according to claim 7, is characterized by comprising the following steps:
step S1, operating the wet deacidification system;
step S2, detecting the liquid level height of the slurry area at the bottom of the wet method tower in real time by the liquid level meter, and feeding the liquid level height back to the controller; the second thermometer detects the temperature of the circulating slurry of the wet tower in real time and feeds the temperature back to the controller;
step S3, introducing flue gas into the wet tower;
step S4, the flue gas quantity detection device, the first thermometer and the hygrometer respectively start to detect the wet process tower inlet flue gas flow, the wet process tower inlet flue gas temperature and the wet process tower inlet flue gas water content and feed back the detected values to the controller;
step S5, calculating and obtaining the water volume V evaporated by the flue gas according to the information fed back to the controller by the liquid level meter, the second thermometer, the flue gas volume detection device, the first thermometer and the hygrometer, wherein the water volume V evaporated by the flue gas is the water supplement volume;
step S6, the controller controls the remote regulating valve to open, and water is supplemented into the wet tower; meanwhile, the controller obtains the opening time T of the remote regulating valve 6 according to the process water flow rate controlled by the remote regulating valve and the water supplementing amount calculated in the step S5;
and step S7, when the opening time of the remote regulating valve reaches T, the controller controls the remote regulating valve to close.
9. The method of replenishing water of claim 8, wherein: in the step S7, in the time period when the opening time of the remote regulating valve does not reach T, the liquid level meter detects that the liquid level of the slurry area exceeds the maximum liquid level, and feeds back information to the controller, and the controller controls the remote regulating valve to close in advance.
10. The method of replenishing water of claim 9, wherein: further comprising step S8;
step S8, demister cleaning
Step S8-1, setting the time length of opening the remote regulating valve when the controller is used for carrying out a cleaning process;
step S8-2, when the pressure drop change of the wet tower is large, the controller controls the remote regulating valve to open to carry out a cleaning process, which is the first cleaning, wherein:
the cleaning process comprises the specific steps that process water enters the lower supporting part from the water inlet pipeline and then is sprayed out from the first atomizing nozzles and the second atomizing nozzles through the connecting pipes to clean the demister;
s8-3, after the first cleaning in the S8-2, when the pressure drop change of the wet tower is recovered to be stable, the cleaning of the demister is finished;
when the pressure drop change of the wet tower is still large, repeating the cleaning process in the step S8-2, wherein the cleaning process is a second cleaning;
step S8-4, after the second cleaning in step S8-3, when the pressure drop change of the wet tower is stable, the cleaning of the demister is finished;
when the pressure drop change of the wet tower is still large, repeating the cleaning process in the step S8-2, wherein the cleaning process is a third cleaning;
step S8-5, after the third cleaning of the step S8-4, when the pressure drop change of the wet tower is recovered to be stable, the cleaning of the demister is finished;
and when the pressure drop change of the wet tower is still large, the wet tower needs to be subjected to comprehensive fault detection.
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| CN202110942766.1A CN113842712B (en) | 2021-08-17 | 2021-08-17 | Demister support with cleaning function, water supplementing system and water supplementing method |
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| CN204395729U (en) * | 2014-12-04 | 2015-06-17 | 湖北宜清环保科技有限公司 | A kind of fume desulfurizing tower |
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| US20190184336A1 (en) * | 2017-12-19 | 2019-06-20 | Doosan Heavy Industries & Construction Co., Ltd. | Wet desulfurization apparatus capable of improving desulfurization efficiency and wet desulfurization method using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204395729U (en) * | 2014-12-04 | 2015-06-17 | 湖北宜清环保科技有限公司 | A kind of fume desulfurizing tower |
| US20190184336A1 (en) * | 2017-12-19 | 2019-06-20 | Doosan Heavy Industries & Construction Co., Ltd. | Wet desulfurization apparatus capable of improving desulfurization efficiency and wet desulfurization method using the same |
| CN108355457A (en) * | 2018-04-24 | 2018-08-03 | 青岛达能环保设备股份有限公司 | Wet desulfurization flue gas disappears white system |
| CN109364698A (en) * | 2018-12-07 | 2019-02-22 | 威海天宇新材料科技有限公司 | A kind of packed absorber |
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