CN113731146A - Wet washing device and cooling method during flue gas washing - Google Patents
Wet washing device and cooling method during flue gas washing Download PDFInfo
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- CN113731146A CN113731146A CN202110953550.5A CN202110953550A CN113731146A CN 113731146 A CN113731146 A CN 113731146A CN 202110953550 A CN202110953550 A CN 202110953550A CN 113731146 A CN113731146 A CN 113731146A
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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 provides a wet-method washing device and a cooling method during flue gas washing, wherein the wet-method washing device comprises a flue gas washing circulating system and a dehumidifying circulating system, the flue gas washing circulating system is used for washing flue gas, the dehumidifying circulating system is used for dehumidifying the flue gas, the wet-method washing device also comprises an inlet spraying system, the inlet spraying system comprises a water tank, a spraying liquid conveying pipeline, a spraying piece and an inlet flue, the water tank is connected with the spraying liquid conveying pipeline, the spraying liquid conveying pipeline is connected with the spraying piece, and the spraying piece extends into the inlet flue for spraying. When the wet-method washing device washes flue gas, the inlet spraying system sprays the flue gas to the inlet flue so as to reduce the heat of the flue gas.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a wet washing device and a cooling method during flue gas washing.
Background
In the wet deacidification technology adopted by the current waste incineration plants, raw flue gas can be cooled after entering a washing tower from an inlet flue, and high-temperature flue gas is difficult to be completely cooled immediately after entering the washing tower due to the reasons of non-uniform flue gas flow field, insufficient gas-liquid contact and the like, and the lower part of the washing tower still has a local high-temperature region; high temperature can reduce the deacidification reaction efficiency, and can also reduce the solubility of absorbent in the absorption liquid to promote salt crystallization, and in addition, the lower barrel of the washing tower is generally required to be lined with heat insulation materials such as flint or refractory bricks, so that the cost and the construction difficulty are increased, and impurities of the circulating liquid can be increased. The existing accident spraying device utilizes a spraying layer for deacidification of a cooling absorption part, so that the problem that the accident spraying water quantity is not matched with the specification of the spraying layer exists, and as the capacity of an emergency water tank arranged at a high position is limited, the design flow of the spraying layer of the cooling absorption part is very large, the accident spraying time can only be maintained for a few minutes, the atomization effect is poor, and the ideal flue gas cooling effect is difficult to achieve; in addition, because the water outlet pipeline connected with the spray layer of the water tank is reserved for a long time, faults are difficult to find in time, and normal operation cannot be carried out possibly under the accident condition; therefore, the existing accident spraying mode has poor cooling effect and low reliability.
Disclosure of Invention
The embodiment of the invention provides a wet washing device and a cooling method during flue gas washing, which at least solve the problems that the temperature of flue gas entering a wet washing tower is higher, the cooling effect of an accident spraying device is poor and the reliability is not high in the related technology.
According to an embodiment of the invention, the wet scrubbing device comprises a smoke scrubbing circulation system and a dehumidifying circulation system, wherein the smoke scrubbing circulation system is used for scrubbing smoke, the dehumidifying circulation system is used for dehumidifying the smoke, the wet scrubbing device further comprises an inlet spraying system, the inlet spraying system comprises a water tank, a spraying liquid conveying pipeline, a spraying piece and an inlet flue, the water tank is connected with the spraying liquid conveying pipeline, the spraying liquid conveying pipeline is connected with the spraying piece, and the spraying piece extends into the inlet flue for spraying.
Furthermore, the inlet spraying system further comprises a dehumidifying and water supplementing pipeline and a process water pipeline, one end of the dehumidifying and water supplementing pipeline is connected with a dehumidifying and circulating pipeline of the dehumidifying and circulating system, the other end of the dehumidifying and water supplementing pipeline is connected with the water tank and used for conveying dehumidifying liquid into the water tank, one end of the process water pipeline is connected with a plant area process water outlet, and the other end of the process water pipeline is connected with the water tank and used for conveying process water into the water tank.
Furthermore, the water tank is provided with a water tank liquid level meter for measuring the liquid level of the water tank, the dehumidification and water supply pipeline is provided with a dehumidification and water supply valve, the process water pipeline is provided with a process water valve, the dehumidification and water supply valve and the process water valve are interlocked with the water tank liquid level meter, and liquid level monitoring data is used as the basis for interlocking action of the dehumidification and water supply valve and the process water valve.
Further, the spraying part comprises a spraying main pipe, a spraying branch pipe and a nozzle, the main body of the spraying main pipe is located in the inlet flue, the spraying main pipe is connected with the spraying branch pipe, the spraying branch pipe is connected with the nozzle, the spraying main pipe, the spraying branch pipe and the nozzle are communicated with each other, the nozzle is used for spraying to the inlet flue, and the grain size range of atomized liquid drops of the nozzle is 400-500 microns.
Further, wash cigarette circulation system including washing cigarette portion tower body, circulation tank, washing cigarette circulating pump, washing cigarette circulating line, washing cigarette and spraying layer and tower level gauge, the circulation tank is located washing cigarette portion tower body bottom, wash the cigarette and spray the upper portion region that the level is located washing cigarette portion tower body, the inlet flue is connected in the circulation tank and is washed the cigarette and spray between the layer, the import of washing cigarette circulating pump links to each other with the circulation tank, it washes the cigarette through washing cigarette circulating line connection and sprays the layer to wash the cigarette circulating pump, it carries the circulating liquid to washing cigarette and sprays the layer to wash the cigarette, sprays the liquid and washes the back to the flue gas and fall into the circulation tank in washing cigarette portion tower body, the tower level gauge is located washing cigarette portion tower body bottom is used for monitoring the liquid level of circulation tank.
Furthermore, the spray liquid conveying pipeline is provided with a spray liquid adjusting valve which is interlocked with a tower liquid level meter arranged at the bottom of the smoke washing part tower body so as to automatically adjust the opening degree of the spray liquid adjusting valve according to the set tower liquid level, thereby controlling the flow of the spray liquid; the spray liquid regulating valve is also interlocked with an inlet temperature measuring device arranged in front of the inlet flue and used for controlling the flow of spray liquid according to the temperature of inlet flue gas.
Furthermore, the dehumidifying circulation system comprises a dehumidifying tower body, a dehumidifying water tank, a dehumidifying circulation pump, a heat exchanger, a dehumidifying circulation pipeline and a dehumidifying spray layer; the dehumidification portion tower body connect in washing cigarette portion tower body top, the dehumidification sprays the upper portion region that the level is located the dehumidification portion tower body, the import and the dehumidification water tank of dehumidification circulating pump link to each other, the export of dehumidification circulating pump links to each other with the heat exchanger, the dehumidification circulating pump passes through dehumidification circulating line and carries dehumidification liquid to the dehumidification and sprays the layer, sprays liquid and falls into dehumidification portion tower body bottom after the dehumidification portion tower body is washed the flue gas once more to carry extremely through the pipeline dehumidification water tank.
According to another embodiment of the present invention, a method for reducing temperature during flue gas scrubbing is provided, which includes:
the water in the water tank flows through a spraying liquid flowmeter, a spraying main pipe and a spraying branch pipe in sequence along a spraying liquid conveying pipeline after the flow is regulated by a spraying liquid regulating valve until reaching a nozzle, is atomized under the action of pressure to form fine liquid drops, is sprayed into an inlet flue to contact with high-temperature flue gas, evaporates and absorbs heat, and reduces the temperature of the flue gas;
monitoring the liquid level of the water tank through a water tank liquid level meter, opening a corresponding water replenishing valve to replenish water to the water tank when the water tank liquid level meter reaches a low liquid level, and closing the corresponding water replenishing valve to stop replenishing water when the water tank liquid level meter reaches a high liquid level, wherein when replenishing water to the water tank, when a whitening working condition operates, a dehumidifying water replenishing valve is opened, and a process water valve is closed; when the non-whitening working condition is operated, the process water valve is opened, and the dehumidifying and water-replenishing valve is closed;
when the temperature of the flue gas measured by the inlet temperature measuring device is lower than the set maximum temperature, the spray liquid regulating valve regulates the flow according to the monitoring data of the tower liquid level meter, and the liquid level is maintained at the set value;
when the flue gas temperature measured by the inlet temperature measuring device exceeds the set highest temperature, the spray liquid regulating valve regulates the flow of the spray liquid to be increased according to the degree of overtemperature so as to enhance the temperature reduction.
Has the advantages that: compared with the prior art, the wet washing device sprays to the inlet flue through the inlet spraying system to reduce the heat of the introduced flue gas, and can solve the problems of high temperature of the flue gas entering the wet washing tower, poor cooling effect of the accident spraying device and low reliability. In the invention, a part of humidifying and cooling processes in the tower are carried out in the inlet flue, so that the temperature of the flue gas entering the tower can be obviously reduced; the reduction of the temperature of the flue gas entering the tower can not only improve the deacidification efficiency of the smoke washing part and reduce the crystallization in the tower, but also save the heat insulating material in the cylinder at the lower part of the washing tower, thereby reducing the weight of the washing tower, saving the cost and reducing the impurities. Meanwhile, the specially designed inlet spraying layer is adopted, so that the atomization effect is good, the spraying amount is small, the required volume of the water tank is small, and the enough spraying time can be maintained; and because the accident spraying and the pre-spraying are integrated, the equipment is in a common state, and faults can be found and eliminated in time. Therefore, the inlet spraying system has good cooling effect and high reliability when an accident happens.
In addition, the inlet spraying system has the function of assisting deacidification, so that the deacidification efficiency of the wet washing tower can be further improved; the inlet spraying system also has the function of automatically replenishing water for the wet scrubbing tower.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a wet scrubbing apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the arrangement of the main spray pipe, the branch spray pipes and the nozzles according to the embodiment of the invention.
The names of the parts represented by numbers or letters in the drawings are as follows:
1. a smoke washing circulating system; 101. a smoke washing part tower body; 102. a circulation tank; 103. a smoke washing circulating pump; 104. a smoke washing circulating pipeline; 105. a smoke washing spraying layer; 106. a tower level gauge; 2. a dehumidifying cycle system; 201. a dehumidifying part tower body; 202. a dehumidifying water tank; 203. a dehumidifying circulation pump; 204. a heat exchanger; 205. a dehumidifying circulation pipe; 206. a dehumidifying spray layer; 207. a spacer; 3. an inlet spray system; 301. a dehumidifying and water replenishing pipeline; 302. a dehumidifying and water replenishing valve; 303. a process water pipeline; 304. a process water valve; 305. a water tank; 306. a tank level gauge; 307. an isolation valve; 308. a spray liquid delivery conduit; 309. a spray liquid regulating valve; 310. a spray flow meter; 311. spraying a main pipe; 312. spraying branch pipes; 313. a nozzle; 314. an inlet temperature measuring device; 315. an inlet flue; 316. an insulating material.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. 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 the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Referring to fig. 1, an embodiment of the present invention provides a wet scrubbing apparatus for wet deacidification and whitening in waste incineration. The wet washing device comprises a smoke washing circulating system 1, a dehumidifying circulating system 2 and an inlet spraying system 3. The flue gas is discharged after being cooled by the inlet spraying system 3, washed by the flue gas washing circulating system 1 and dehumidified by the dehumidifying circulating system 2.
The smoke washing circulating system 1 comprises a smoke washing part tower body 101, a circulating pool 102, a smoke washing circulating pump 103, a smoke washing circulating pipeline 104, a smoke washing spraying layer 105 and a tower liquid level meter 106. The circulation tank 102 is positioned at the bottom of the smoke washing part tower body 101. The smoke washing spraying layer 105 is located in the upper area in the smoke washing part tower body 101. The inlet flue 315 is connected between the circulation tank 102 and the scrubber spray layer 105. The flue gas enters from the inlet flue 315 and then enters the flue gas washing section tower 101.
The inlet of the smoke washing circulating pump 103 is connected with the circulating tank 102. The smoke washing circulating pump 103 is connected with the smoke washing spraying layer 105 through a smoke washing circulating pipeline 104. The smoke washing circulating pump 103 conveys the circulating liquid to the smoke washing spraying layer 105. The spray liquid washes the flue gas in the flue gas washing part tower body 101 and then falls into the circulating tank 102. The tower liquid level meter 106 is arranged at the bottom of the smoke washing part tower body 101 and used for monitoring the liquid level of the circulating pool 102.
The dehumidifying cycle system 2 includes a dehumidifying tower 201, a dehumidifying water tank 202, a dehumidifying cycle pump 203, a heat exchanger 204, a dehumidifying cycle pipe 205, and a spray layer 206.
The dehumidification portion tower body 201 is connected above the smoke purge portion tower body 101. The dehumidifying spray layer 206 is located in an upper region within the dehumidifying part tower body 201. The dehumidification section tower 201 is provided with a partition 207 in a bottom region. The partition 207 is capable of allowing flue gas to pass and blocking liquid from falling into the flue gas scrubber section tower 101.
An inlet of the dehumidifying circulation pump 203 is connected to the dehumidifying water tank 202. The outlet of the dehumidifying circulation pump 203 is connected to a heat exchanger 204. The dehumidifying circulation pump 203 delivers the dehumidifying liquid to the dehumidifying spray layer 206 through the dehumidifying circulation pipe 205. The spray liquid washes the flue gas in the dehumidifying part tower body 201 again, falls into the bottom of the dehumidifying part tower body 201, and then is conveyed to the dehumidifying water tank 202 through a pipeline.
The inlet spray system 3 comprises a dehumidification and water supplement pipeline 301, a dehumidification and water supplement valve 302, a process water pipeline 303, a process water valve 304, a water tank 305, a water tank liquid level meter 306, an isolation valve 307, a spray liquid delivery pipeline 308, a spray liquid adjusting valve 309, a spray liquid flow meter 310, a spray main pipe 311, a spray branch pipe 312, a nozzle 313, an inlet temperature measuring device 314 and an inlet flue 315.
The main spray pipe 311, the branch spray pipes 312 and the nozzles 313 form a spray part. The spray member extends partially into the inlet flue to spray toward the inlet flue.
The dehumidifying and moisturizing pipe 301 has one end connected to the dehumidifying circulation pipe 205 and the other end connected to the water tank 305. The water tank 305 is disposed above the dehumidifying part tower 201. A dehumidifying and water-replenishing valve 302 is arranged on the dehumidifying and water-replenishing pipeline 301 and is used for controlling the delivery of dehumidifying liquid to the water tank 305. One end of the process water pipeline 303 is connected with a factory process water outlet, and the other end is connected with the water tank 305. A process water valve 304 is arranged on the process water pipe 303 and used for controlling the process water to be conveyed into the water tank 305.
The water tank 305 is provided with a water tank liquid level meter 306 for measuring the liquid level of the water tank, the dehumidification and water supply valve 302 and the process water valve 304 are interlocked with the water tank liquid level meter 306, and the liquid level monitoring data is used as the basis for the interlocking action of the dehumidification and water supply valve 302 and the process water valve 304. When the liquid level of the water tank 305 is lower than the preset value, the water replenishing is started.
The bottom of the water tank 305 is connected with a spray liquid conveying pipeline 308. The spray liquid delivery pipe 308 is provided with an isolation valve 307, a spray liquid regulating valve 309 and a spray liquid flow meter 310. The isolation valve 307 is provided upstream of the spray liquid adjustment valve 309 and the spray liquid flow meter 310.
The spray liquid regulating valve 309 is interlocked with the tower liquid level meter 106 arranged at the bottom of the smoke washing part tower body 101, and the opening degree of the spray liquid regulating valve 309 can be automatically regulated according to the set tower liquid level, so that the flow of the spray liquid is controlled. The spray liquid regulating valve 309 is also interlocked with an inlet temperature measuring device 314 arranged in front of the inlet flue 315 for spray liquid flow control according to the inlet flue gas temperature.
The spray flow meter 310 is used to measure the spray flow rate. The lower end of the spray liquid delivery pipe 308 is connected with a spray main pipe 311 of a spray piece, the main body of the spray main pipe 311 is positioned in an inlet flue 315, a spray branch pipe 312 is connected with the spray main pipe 311, a nozzle 313 is connected with the spray branch pipe 312, and the spray main pipe 311, the spray branch pipe 312 and the nozzle 313 are communicated with each other. Through the design of the spray pipe structure, the outlet flow of each nozzle 313 is basically uniformly distributed and is uniformly distributed on the same section of the inlet flue 315; the spraying direction of the nozzles 313 is the same as the flow direction of the flue gas. The main spray pipe 311, the branch spray pipes 312 and the nozzles 313 are all made of heat-resistant and corrosion-resistant materials. Because the flue gas temperature in the inlet flue is higher, a heat insulating material 316 is laid outside the anticorrosive layer on the inner wall of the inlet flue 315 to protect the anticorrosive layer.
The particle diameter of the atomized liquid drops of the nozzle 313 should not be too large or too small, too large does not achieve good cooling effect, too small is likely to cause the liquid drops to be entrained out of the tower, and the particle diameter of the atomized liquid drops of the nozzle 313 is preferably between 400 and 500 μm.
Referring to fig. 2, the number of spray nozzles 313 and the arrangement of spray members are different according to the size of the inlet flue 315, and fig. 2 only shows one arrangement of the main spray pipe 311, the branch spray pipes 312 and the spray nozzles 313 corresponding to 4 spray nozzles, for example. Wherein, a plurality of spray branch pipes 312 are arranged vertically to the main spray pipe 311. A plurality of spray nozzles 313 are spaced apart on the shower branch pipe 312. To ensure full coverage of the spray on the cross-section of the inlet stack 315, the spray coverage at a spray distance of 1m is preferably not less than 200%.
When the wet system normally operates, the isolation valve 307 is opened, water in the water tank 305 automatically flows downwards along the spraying liquid conveying pipeline 307 under the action of gravity, flows through the spraying liquid flowmeter 310, the spraying main pipe 311 and the spraying branch pipe 312 in sequence after the flow is regulated by the spraying liquid regulating valve 309 until reaching the nozzle 313, is atomized under the action of pressure to form fine liquid drops, and is sprayed into the inlet flue 315. The liquid drops contact with the high-temperature flue gas in the inlet flue 315 and then evaporate and absorb heat, so that the temperature of the flue gas is reduced, and the liquid drops which are not completely evaporated enter the tower body 102 of the smoke washing part along with the airflow or along the inner wall of the inlet flue. The water tank 305 is supplied with water in two ways, one from the dehumidification circulation fluid and the other from the plant area process water. When the dehydration working condition is operated, because the dehumidification function of the dehumidification part generates a large amount of redundant dehumidification liquid, the dehumidification and water supplement valve 302 is opened, the process water valve 304 is closed, and the dehumidification liquid is used for inlet spraying; when the non-whitening working condition is operated, no redundant dehumidifying liquid is generated, at the moment, the process water valve 304 is opened, the dehumidifying and water supplementing valve 302 is closed, and the process water is used for inlet spraying. The dehumidifying and water supplementing valve 302 or the process water valve 304 is automatically opened and closed according to the monitoring data of the water tank liquid level meter 306, the water tank liquid level is maintained between a low liquid level and a high liquid level, when the water tank liquid level meter 306 reaches the low liquid level, the corresponding water supplementing valve is automatically opened, and when the water tank liquid level meter 306 reaches the high liquid level, the corresponding water supplementing valve is automatically closed. When the flue gas temperature measured by the inlet temperature measuring device 314 is lower than the set maximum temperature, the spray liquid regulating valve 309 automatically regulates according to the monitoring data of the tower liquid level meter 106, and the liquid level of the washing tower is maintained at the set value.
When an accident happens, such as when the smoke washing circulating pump 103 is shut down all at once, the inside of the washing tower cannot be damaged by high-temperature smoke due to the pre-cooling effect of the inlet spraying system 3 on the smoke; or when the flue gas temperature measured by the inlet temperature measuring device 314 exceeds the set maximum temperature, the spray liquid regulating valve 309 automatically increases the spray liquid flow according to the degree of overtemperature to enhance the temperature reduction. The spray liquid regulating valve 309 is set to be switched on when power is lost or switched off when gas is lost, so that water in the water tank 305 can still automatically flow to the inlet flue for pre-spraying cooling even if the valve is switched off or the gas is switched off, and the spraying time can be maintained for a long time.
The embodiment of the invention also provides a cooling method during flue gas washing, which comprises the following steps:
the water in the water tank flows through a spraying liquid flowmeter, a spraying main pipe and a spraying branch pipe in sequence along a spraying liquid conveying pipeline after the flow is regulated by a spraying liquid regulating valve until reaching a nozzle, is atomized under the action of pressure to form fine liquid drops, is sprayed into an inlet flue to contact with high-temperature flue gas, evaporates and absorbs heat, and reduces the temperature of the flue gas;
monitoring the liquid level of the water tank through a water tank liquid level meter, opening a corresponding water replenishing valve to replenish water to the water tank when the water tank liquid level meter reaches a low liquid level, and closing the corresponding water replenishing valve to stop replenishing water when the water tank liquid level meter reaches a high liquid level, wherein when replenishing water to the water tank, when a whitening working condition operates, a dehumidifying water replenishing valve is opened, and a process water valve is closed; when the non-whitening working condition is operated, the process water valve is opened, and the dehumidifying and water-replenishing valve is closed;
when the temperature of the flue gas measured by the inlet temperature measuring device is lower than the set maximum temperature, the spray liquid regulating valve regulates the flow according to the monitoring data of the tower liquid level meter, and the liquid level is maintained at the set value;
when the flue gas temperature measured by the inlet temperature measuring device exceeds the set highest temperature, the spray liquid regulating valve regulates the flow of the spray liquid to be increased according to the degree of overtemperature so as to enhance the temperature reduction.
The inlet spraying system of the scheme solves the problem of cooling of the wet scrubbing tower under the accident condition. On one hand, the specially designed inlet spraying layer is adopted, so that the atomization effect is good, the spraying amount is small, the required volume of the water tank is small, and the enough spraying time can be maintained; on the other hand, because the accident spraying and the pre-spraying are integrated, the equipment is in a common state, and faults can be found and eliminated in time. Therefore, the inlet spraying system has good cooling effect and high reliability when an accident happens.
In the prior art, the humidifying and cooling of the washing tower are all carried out in the tower, and according to the material energy balance calculation and the actual operation condition, if the inlet flue gas temperature is 110 ℃, the flue gas temperature at the outlet of the smoke washing part can be reduced to about 65 ℃. The technical scheme is that a part of humidification and temperature reduction processes are carried out in an inlet flue, the evaporation water in the tower is reduced, but the total evaporation water of the system is unchanged. Neglecting the sensible heat absorbed by liquid water to saturation state, according to energy balance, the heat released by the flue gas Q1= latent heat of vaporization of liquid water Q2I.e. specific heat capacity of flue gas c1Temperature drop Δ t of flue gas1Mass m of flue gas1= water evaporation rate lambda water vaporization latent heat R water mass m2If the water evaporation rate is lambda = smoke specific heat capacity c1Temperature of smoke Δ t1Mass m of flue gas1/(latent heat of vaporization of Water R. Water mass m2) When other parameters are not changed, the evaporation rate lambda and the temperature of the flue gas are decreased1Is in direct proportion. Because the amount of the inlet spray liquid is the amount of water supplement required by the washing tower, when the evaporation rate is 100%, the temperature of the flue gas entering the tower can be reduced to about 65 ℃, when the evaporation rate of the inlet spray liquid is 70%, the temperature of the flue gas entering the tower can be reduced to 78.5 ℃, and when the evaporation rate of the inlet spray liquid is 60%, the temperature of the flue gas entering the tower can be reduced to 83 ℃. Therefore, the inlet spraying can obviously reduce the temperature of the flue gas entering the tower, not only can improve the deacidification efficiency of the smoke washing part and reduce the crystallization in the tower, but also can save the heat insulation material in the cylinder at the lower part of the washing tower, thereby reducing the weight of the washing tower and saving the energyCost and impurity reduction.
The inlet spray liquid is dehumidifying liquid or process water and can absorb acid gas, so that the primary deacidification is added when the wet washing tower is used for spraying at the inlet in normal operation, and the contact reaction time of the flue gas and the washing liquid is prolonged; in addition, the inlet spraying also reduces the temperature of the flue gas entering the tower, thereby reducing the gas phase partial pressure of gas-liquid reaction and being beneficial to the absorption of acid gas at a smoke washing part. Therefore, the inlet spraying system has the function of assisting deacidification, and can further improve the deacidification efficiency of the wet washing tower.
During normal operation, this scheme entry sprays the volume and controls according to the tower liquid level, and the entry sprays the volume and realizes for the required moisturizing volume of scrubbing tower promptly, and the mode that the scrubbing tower moisturizing sprayed through the entry promptly need not additionally to give the scrubbing tower moisturizing again, can not produce unnecessary waste water yet. Therefore, the inlet spraying system also has the function of automatic water replenishing.
The high-level water tank can be used as a buffer container to provide a stable and continuous water source for inlet spraying, and the height difference of more than ten meters between the high-level water tank and the spraying layer at the inlet flue is utilized to provide the pressure required by nozzle spraying; the high-level water tank has two modes of water replenishing, one mode is that the original dehumidifying circulating pump is used for providing power to replenish relatively clean dehumidifying water to the water tank instead of the absorption liquid at the bottom of the washing tower, so that the utilization rate of the dehumidifying liquid is improved, and the phenomena of scaling and serious crystallization can be avoided; and the other method is to supplement the process water to the water supply tank by utilizing the pressure of the process water of the plant area, so that the water supplement is reliable. Therefore, the inlet spraying system is simple in structure and high in feasibility.
In a word, the invention fully considers the self characteristics of the waste incineration wet deacidification system, provides a wet washing device and a cooling method during flue gas washing, and an inlet spraying system of the wet washing device has the functions of accident spraying, pre-cooling, deacidification and water replenishing at the same time, has simple structure and high feasibility, is convenient to transform on the existing wet system, is beneficial to the efficient, safe and stable operation of the wet deacidification system, and has better engineering application value.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a wet scrubbing device, is including washing cigarette circulating system and dehumidification circulating system, its characterized in that, it is used for washing the flue gas to wash cigarette circulating system, dehumidification circulating system is used for dehumidifying for the flue gas, wet scrubbing device still includes entry spraying system, entry spraying system includes the water tank, sprays liquid pipeline, sprays a and entry flue, the water tank is connected spray liquid pipeline, spray liquid pipeline connects spray the piece, spray the piece and stretch into the entry flue and spray.
2. The wet scrubbing apparatus as set forth in claim 1, wherein: the inlet spraying system further comprises a dehumidifying and water supplementing pipeline and a process water pipeline, one end of the dehumidifying and water supplementing pipeline is connected with a dehumidifying and circulating pipeline of the dehumidifying and circulating system, the other end of the dehumidifying and water supplementing pipeline is connected with the water tank and used for conveying dehumidifying liquid into the water tank, one end of the process water pipeline is connected with a plant area process water outlet, and the other end of the process water pipeline is connected with the water tank and used for conveying process water into the water tank.
3. A wet scrubbing apparatus as set forth in claim 2, wherein: the water tank is provided with a water tank liquid level meter for measuring the liquid level of the water tank, the dehumidification and water supply pipeline is provided with a dehumidification and water supply valve, the process water pipeline is provided with a process water valve, the dehumidification and water supply valve and the process water valve are interlocked with the water tank liquid level meter, and liquid level monitoring data is used as the basis for interlocking action of the dehumidification and water supply valve and the process water valve.
4. The wet scrubbing apparatus as set forth in claim 1, wherein: the spraying part comprises a spraying main pipe, a spraying branch pipe and a nozzle, the main body of the spraying main pipe is located in the inlet flue, the spraying main pipe is connected with the spraying branch pipe, the spraying branch pipe is connected with the nozzle, the spraying main pipe, the spraying branch pipe and the nozzle are communicated with each other, the nozzle is used for spraying to the inlet flue, and the grain size range of atomized liquid drops of the nozzle is 400-500 mu m.
5. The wet scrubbing apparatus as set forth in claim 1, wherein: wash cigarette circulation system and spray layer and tower level gauge including washing cigarette portion tower body, circulation tank, washing cigarette circulating pump, washing cigarette circulating line, washing cigarette, the circulation tank is located washing cigarette portion tower body bottom, it sprays the upper portion region that the level is located washing cigarette portion tower body to wash the cigarette, the inlet flue is connected in the circulation tank and is washed between the cigarette portion spraying layer, the import and the circulation tank of washing cigarette circulating pump link to each other, it washes the cigarette through washing cigarette circulating line connection and sprays the layer to wash the cigarette circulating pump, it sprays the layer with the circulating liquid to carry to washing cigarette to wash the cigarette circulating pump, sprays the liquid and washes the back and fall into the circulation tank in washing cigarette portion tower body, the tower level gauge is located washing cigarette portion tower body bottom is used for the monitoring the liquid level of circulation tank.
6. The wet scrubbing apparatus as set forth in claim 5, wherein: the dehumidifying circulation system comprises a dehumidifying part tower body, a dehumidifying water tank, a dehumidifying circulation pump, a heat exchanger, a dehumidifying circulation pipeline and a dehumidifying spray layer; the dehumidification portion tower body connect in washing cigarette portion tower body top, the dehumidification sprays the upper portion region that the level is located the dehumidification portion tower body, the import and the dehumidification water tank of dehumidification circulating pump link to each other, the export of dehumidification circulating pump links to each other with the heat exchanger, the dehumidification circulating pump passes through dehumidification circulating line and carries dehumidification liquid to the dehumidification and sprays the layer, sprays liquid and falls into dehumidification portion tower body bottom after the dehumidification portion tower body is washed the flue gas once more to carry extremely through the pipeline dehumidification water tank.
7. The wet scrubbing apparatus as set forth in claim 5, wherein: the spray liquid conveying pipeline is provided with a spray liquid adjusting valve which is interlocked with the tower liquid level meter so as to automatically adjust the opening degree of the spray liquid adjusting valve according to the set tower liquid level and further control the flow of the spray liquid; the spray liquid regulating valve is also interlocked with an inlet temperature measuring device arranged in front of the inlet flue and used for controlling the flow of spray liquid according to the temperature of inlet flue gas.
8. A cooling method for flue gas washing is characterized by comprising the following steps:
the water in the water tank flows through a spraying liquid flowmeter, a spraying main pipe and a spraying branch pipe in sequence along a spraying liquid conveying pipeline after the flow is regulated by a spraying liquid regulating valve until reaching a nozzle, is atomized under the action of pressure to form fine liquid drops, is sprayed into an inlet flue to contact with high-temperature flue gas, evaporates and absorbs heat, and reduces the temperature of the flue gas;
monitoring the liquid level of the water tank through a water tank liquid level meter, opening a corresponding water replenishing valve to replenish water to the water tank when the water tank liquid level meter reaches a low liquid level, and closing the corresponding water replenishing valve to stop replenishing water when the water tank liquid level meter reaches a high liquid level, wherein when replenishing water to the water tank, when a whitening working condition operates, a dehumidifying water replenishing valve is opened, and a process water valve is closed; when the non-whitening working condition is operated, the process water valve is opened, and the dehumidifying and water-replenishing valve is closed;
when the temperature of the flue gas measured by the inlet temperature measuring device is lower than the set maximum temperature, the spray liquid regulating valve regulates the flow according to the monitoring data of the tower liquid level meter, and the liquid level is maintained at the set value;
when the flue gas temperature measured by the inlet temperature measuring device exceeds the set highest temperature, the spray liquid regulating valve regulates the flow of the spray liquid to be increased according to the degree of overtemperature so as to enhance the temperature reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110953550.5A CN113731146A (en) | 2021-08-19 | 2021-08-19 | Wet washing device and cooling method during flue gas washing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110953550.5A CN113731146A (en) | 2021-08-19 | 2021-08-19 | Wet washing device and cooling method during flue gas washing |
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| CN113731146A true CN113731146A (en) | 2021-12-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115382391A (en) * | 2022-08-29 | 2022-11-25 | 中节能(象山)环保能源有限公司 | Domestic waste burns flue gas processing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115382391A (en) * | 2022-08-29 | 2022-11-25 | 中节能(象山)环保能源有限公司 | Domestic waste burns flue gas processing system |
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