CN112827328A - Wet smoke plume processing device and method - Google Patents
Wet smoke plume processing device and method Download PDFInfo
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- CN112827328A CN112827328A CN201911168553.7A CN201911168553A CN112827328A CN 112827328 A CN112827328 A CN 112827328A CN 201911168553 A CN201911168553 A CN 201911168553A CN 112827328 A CN112827328 A CN 112827328A
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- B01D53/26—Drying gases or vapours
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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
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- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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Abstract
The invention provides a wet smoke plume processing unit, which comprises a smoke heat exchange device, a smoke purification device and a circulating cooling device which are connected in sequence, wherein a desulphurization demister is arranged between a cooling section and a desulphurization section of a desulphurization washing tower in the smoke purification device, so that a condenser and a heater are not required to be arranged in the desulphurization washing tower, the equipment is simple, the desulphurization demister can remove ash from smoke, the smoke contacting with circulating cooling liquid is cleaner, the load of the circulating cooling device is reduced, and the equipment requirement is lowered; the invention also provides a wet smoke plume processing method, which reduces the smoke saturation by adopting a mode of mixing the circulating cooling liquid sprayed condensed smoke and smoke air, heats the clean smoke by using the waste heat of the smoke, reduces the energy consumption and better solves the problem of wet smoke plume.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a wet smoke plume treatment device and a wet smoke plume treatment method.
Background
At present, in the domestic industries of electric power, chemical industry, metallurgy, coking and the like, a large amount of waste gas is required to be discharged due to the combustion of fossil fuels in the production process, and the waste gas contains various pollutant components, such as SO2、NOxDust, heavy metals and the like, and corresponding environment-friendly treatment facilities need to be matched. Wherein SO in the flue gas2The treatment process commonly adopts a wet desulphurization technology, namely sulfur-containing flue gas passes through a tower containing an alkaline absorbent (CaCO)3、Ca(OH)2、Mg(OH)2、NH3Etc.) to remove SO from the flue gas2Reaction removal is obtained, and the purified flue gas is discharged into the atmosphere through a chimney.
When a wet desulphurization process is adopted, the desulfurized flue gas is usually in a saturated humidity state, the water content in the saturated wet flue gas and the flue gas temperature are in an exponential relationship, and the higher the temperature is, the higher the water content in the flue gas is. The smoke under saturated humidity is rapidly cooled by the atmosphere with lower temperature after being discharged from the chimney, the water vapor in the smoke is condensed into liquid, the light transmittance is reduced, and the phenomenon of white smoke plume visible to naked eyes is caused. Along with the diffusion of the water vapor in the atmosphere, the concentration of the water vapor is reduced, the light transmittance is improved, and the white smoke plume is slowly reduced until disappears and cannot be seen.
When the ambient temperature is lower or the humidity is higher, the wet smoke plume length is more obvious; especially, when two factors exist simultaneously, the phenomenon of plume tailing is particularly serious, sometimes even lasting several kilometers, so that serious visual pollution is caused, and the physical and mental health of surrounding people is influenced.
There are generally three solutions to reduce the appearance of white smoke: (1) flue gas condensation: the temperature of the flue gas is reduced, the condensed moisture is extracted, and the absolute water content of the discharged flue gas is reduced. (2) Flue gas heating: raising the temperature of the flue gas to change saturated wet flue gas into unsaturated flue gas; (3) firstly, condensation and reheating: the smoke discharging moisture can be reduced, the wet smoke can be unsaturated, and the effect is best.
CN208927895U discloses a wet smoke plume removing system by condensing desulfurized flue gas slurry, which reduces the temperature of flue gas by adopting a spraying mode, and reduces the moisture content in the flue gas by removing liquid drops through a demister, but the flue gas is still saturated and has poor effect.
CN208927788U discloses a smoke plume de-whitening device, which is internally provided with a plurality of condensing tubes to condense water vapor in smoke, but the device has a complex structure and is not suitable for the existing desulfurizing tower system.
CN109999627A discloses a device and a method for catalytic cracking wet desulphurization, wherein a heat exchanger is arranged on an outlet flue of a desulphurization tower, and a flue gas heater or a condenser can be directly arranged on the outlet flue for generally heating or cooling the flue gas at a desulphurization outlet. However, the flue gas heater or condenser is large in size and weight, high in cost, and difficult to implement especially on a modification project in the form of a chimney arranged at the top of a desulfurizing tower.
Therefore, there is a need to develop a wet smoke plume treatment apparatus and method with low energy consumption, simple apparatus and good treatment effect.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a wet smoke plume processing device, wherein a desulfurization demister is arranged between a cooling section and a desulfurization section of a desulfurization washing tower in a smoke purification device, a smoke exhaust pipeline of the desulfurization washing tower is provided with a smoke-air mixer, the temperature rise or the temperature reduction of smoke can be realized without arranging a heat exchanger in the desulfurization washing tower, the equipment is simple, and the modification on the existing desulfurization washing tower is easy; the desulfurization demister can ensure that the circulating cooling liquid is cleaner, reduce the load of a circulating cooling device and reduce the equipment requirement; the wet smoke plume treatment method using the device not only well solves the problem of emission of wet smoke plume, but also heats clean smoke by using waste heat of the smoke to reduce energy consumption, and discharges cleaner cooling liquid which can be used as water supplement of a desulfurization washing tower or other industrial water, thereby improving the resource utilization rate and having higher industrial application value.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a wet smoke plume processing device, which comprises a smoke heat exchange device, a smoke purification device and a circulating cooling device which are connected in sequence; the flue gas purification device comprises a desulfurization washing tower, and the desulfurization washing tower sequentially comprises a cooling section and a desulfurization section from top to bottom; and a desulfurization demister is arranged between the cooling section and the desulfurization section.
According to the wet smoke plume processing device, the smoke heat exchange device, the smoke purification device and the circulating cooling device are sequentially connected, the temperature of smoke can be lowered and raised without arranging a heat exchanger in the desulfurization washing tower, and the equipment is small in size; the device still makes the recirculated cooling liquid cleaner through set up the desulfurization defroster between the cooling zone of desulfurization scrubbing tower and desulfurization section, makes discharged coolant liquid can regard as desulfurization scrubbing tower moisturizing or other industrial water when reducing equipment requirement, has reduced the energy consumption.
The wet smoke plume processing device provided by the invention is particularly suitable for project reconstruction of the existing desulfurization washing tower, because the heat exchanger is difficult to arrange on the chimney at the top of the existing desulfurization washing tower, and the cost for installing the heat exchanger in the tower is high.
Preferably, a cooling demister, a cooling spray layer and a circulating cooling liquid collector are sequentially arranged in the cooling section of the desulfurization washing tower from top to bottom.
Preferably, the desulfurization section in the desulfurization washing tower is provided with a desulfurization spraying layer.
Preferably, the number of desulfurization spray levels is at least 1, and may be, for example, 1, 2, 3, 4, 5, or 6, preferably 3.
According to the invention, the desulfurization spraying layer is preferably arranged into a plurality of layers, so that the desulfurization spraying liquid is contacted with the flue gas in a plurality of layers, the mass transfer and heat transfer of the flue gas and the desulfurization spraying liquid are further promoted, and the flue gas desulfurization and cooling effects are better.
Preferably, the bottom of the desulfurization washing tower is a slurry tank.
The liquid in the slurry tank is not limited in the invention, and any slurry or solution containing alkaline absorbent for desulfurization, such as CaCO, known to those skilled in the art can be used3、Ca(OH)2、Mg(OH)2Or NH3And the like.
Preferably, the desulfurization washing tower is provided with a flue gas inlet at one side of the tower body between the desulfurization section and the slurry tank.
Preferably, the flue gas purification device further comprises a desulfurization circulating pump arranged outside the desulfurization washing tower.
Preferably, the number of desulfurization circulating pumps is at least 1, and may be, for example, 1, 2, 3, 4, 5, or 6, preferably 3.
The invention preferably adopts a plurality of desulfurization circulating pumps, so that the desulfurization spray liquid can be respectively circulated to a plurality of desulfurization spray layers for spray desulfurization, and the adoption of a plurality of desulfurization circulating pumps can reduce the requirement of pump equipment and separately regulate and control the flow of the desulfurization circulating pumps.
Preferably, the outlet of the desulfurization circulating pump is connected with a desulfurization spraying layer.
Preferably, the top of the desulfurization washing tower is provided with a smoke outlet.
Preferably, a smoke exhaust pipeline is installed on the smoke outlet.
Preferably, the flue gas heat exchange device comprises a flue gas-air mixer arranged at a smoke exhaust pipeline of the desulfurization washing tower.
The flue gas mixer is further arranged at the position of the flue gas exhaust pipeline of the desulfurization washing tower, so that air after heat exchange with flue gas is mixed with clean flue gas, the temperature of the clean flue gas is increased, the flue gas becomes unsaturated flue gas and then is exhausted, the problem of wet smoke plume is better solved, the waste heat of the flue gas is utilized to exchange heat with the clean flue gas, the energy consumption is reduced, and the flue gas mixer has a higher industrial application prospect.
Preferably, the flue gas heat exchange device further comprises a flue gas-air heat exchanger arranged in front of the desulfurization washing tower.
Preferably, the flue gas-air heat exchanger comprises an air outlet, an air inlet, a flue gas outlet and a flue gas inlet.
Preferably, the flue gas heat exchange device further comprises a blower connected with an air inlet of the flue gas-air heat exchanger.
Preferably, the flue gas outlet of the flue gas-air heat exchanger is connected with the flue gas inlet of the desulfurization washing tower.
Preferably, the air outlet of the smoke-air heat exchanger is connected with the smoke-air mixer.
Preferably, the circulating cooling device comprises a cooling liquid collecting box, a cooling circulating pump and a circulating cooler which are connected in sequence, and the cooling circulating pump is connected with the middle part of the cooling liquid collecting box.
Preferably, the circulation cooler is provided with a condensed water inlet, a condensed water outlet, a circulating cooling liquid inlet and a circulating cooling liquid outlet.
Preferably, the circulating cooling liquid outlet of the circulating cooler is connected with the cooling spraying layer in the desulfurization washing tower.
Preferably, the cooling liquid collecting box is connected with a circulating cooling liquid collector in the desulfurization washing tower.
Preferably, the circulation cooling device further comprises a condensate discharge pump arranged at a bottom outlet of the coolant collection tank.
According to the invention, the condensate discharging pump is arranged at the bottom outlet of the cooling liquid collecting box, so that liquid condensed when flue gas contacts with circulating cooling liquid is discharged, and the water balance in the desulfurization washing tower system is ensured.
In a second aspect, the present invention provides a wet smoke plume processing method, which is performed by using the wet smoke plume processing apparatus according to the first aspect.
The wet smoke plume processing method provided by the invention is carried out by adopting the wet smoke plume processing device in the first aspect, so that the problem of wet smoke plume processing can be better solved, the energy consumption is reduced, the resource utilization rate is improved, and the method has a larger practical application value.
Preferably, the method comprises the steps of:
(1) the flue gas is subjected to heat exchange and temperature reduction through a flue gas heat exchange device;
(2) and the cooled flue gas enters a desulfurization washing tower, and is subjected to desulfurization in a desulfurization section, demisting in a desulfurization demister and cooling in a cooling section in sequence to obtain clean flue gas.
According to the wet smoke plume processing method provided by the invention, the smoke is introduced into the desulfurization washing tower after heat exchange, and then the demisting step of the desulfurization demister is added between desulfurization and cooling, so that the circulating cooling liquid is cleaner and can be used as water supplement for desulfurization washing or other industrial water, and the resource utilization rate is improved.
The invention is not particularly limited in terms of flue gas flow, temperature and source, and may be selected from any flue gas requiring a de-whitening treatment known to those skilled in the artThe source, the smoke with different temperatures and flow rates can be treated by the wet smoke plume treatment method provided by the invention, and the smoke flow rate can be 500Nm3/h、1000Nm3/h、5000Nm3/h、10000Nm3/h、20000Nm3/h、90000Nm3/h、150000Nm3/h、200000Nm3/h、450000Nm3/h、600000Nm3H or 900000Nm3H, etc.; the temperature of the flue gas may be, for example, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃, 130 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃ or 220 ℃.
Preferably, the flue gas exchanges heat with air through a flue gas-air heat exchanger to reduce the temperature.
Preferably, the flue gas exchanges heat with ambient air through a flue gas-air heat exchanger to reduce the temperature.
The invention has no special limit to the flow and initial temperature of the air exchanging heat with the flue gas, can adopt the ambient air temperature according to the local environment and season, and selects the flow of the air according to the flow and temperature of the treated flue gas.
The temperature of the flue gas after cooling is not particularly limited in the present invention, and can be reduced to any temperature suitable for entering the desulfurization scrubber, which is well known to those skilled in the art, for example, 80 ℃, 100 ℃, 112 ℃, 115 ℃, 118 ℃, 120 ℃, 122 ℃, 125 ℃, 128 ℃, 130 ℃, 140 ℃ or 150 ℃ and the like.
The invention has no special limit on the air temperature after heat exchange, and the air temperature after heat exchange can be obtained by carrying out heat exchange calculation according to different flue gas flow rates, temperatures before and after heat exchange of the flue gas, air flow rates and air initial temperatures.
Preferably, the desulfurization in the desulfurization section in the step (2) is spray desulfurization through a desulfurization spray layer.
Preferably, the desulfurization spray layer spray desulfurization is multi-layer desulfurization spray layer spray desulfurization, preferably 3 layers.
The invention preferentially sprays and desulfurizes the flue gas through a plurality of layers of desulfurization spraying layers, so that the flue gas is more fully contacted with desulfurization spraying liquid, the mass transfer and the heat transfer are more fully, and the desulfurization and the temperature reduction are more effective.
Preferably, the desulfurization spraying liquid sprayed by the desulfurization spraying layer flows into a slurry tank at the bottom of the desulfurization washing tower.
The desulfurization spray liquid of the present invention is not limited, and any slurry or solution containing an alkaline absorbent, such as CaCO, known to those skilled in the art, which can be used for desulfurization, can be used3、Ca(OH)2、Mg(OH)2Or NH3And the like.
Preferably, the desulfurization spraying liquid in the slurry tank is circulated to the desulfurization spraying layer through a desulfurization circulating pump for recycling.
Preferably, the cooling stage cooling comprises a cooled spray layer spraying step.
Preferably, the flue gas is condensed to produce a condensate when sprayed through the cooling spray layer.
The invention does not specially limit the flow of the generated condensate, because different environmental temperatures have different requirements on the temperature and the humidity of the wet smoke plume after treatment, the temperature difference of spraying and condensing has larger difference according to different requirements and the smoke flow, and the invention is not specially limited.
Preferably, the cooling section cooling further comprises a demisting step of the cooling demister after the cooling spray layer is sprayed.
The invention also comprises a demisting step after cooling, further removes water vapor in the smoke, and can better eliminate the trailing phenomenon of the wet smoke plume.
Preferably, the method further comprises step (3):
(3) and (3) the purified flue gas enters a flue gas-air mixer to be mixed with the air subjected to heat exchange in the step (1) to form unsaturated flue gas, and then the unsaturated flue gas is discharged.
The invention preferably mixes the clean smoke with the air after heat exchange and then discharges the mixture, on one hand, the temperature of the smoke is increased to become unsaturated smoke, and the phenomenon of wet smoke plume is eliminated; on the other hand, the air is mixed with the air after heat exchange, so that the overall energy consumption is reduced.
The present invention does not specially limit the temperature of the unsaturated flue gas, because different environmental temperatures have different requirements for the treatment of the wet smoke plume, the requirement for the temperature of the unsaturated flue gas is lower when the environmental temperature is high in summer, the wet smoke plume phenomenon is less, and the requirement for the temperature of the unsaturated flue gas is higher when the environmental temperature is low in winter, the present invention does not specially limit the present invention, and the temperature suitable for the unsaturated flue gas with different environmental temperatures, which is well known to those skilled in the art, can be adopted, for example, 40 ℃, 45 ℃, 50 ℃, 51 ℃, 52 ℃, 52.5 ℃, 53 ℃, 53.5 ℃, 54 ℃, 54.5 ℃, 55 ℃, 55.5 ℃, 56 ℃, 56.5 ℃, 57 ℃, 58 ℃, 58.5 ℃, 59 ℃, 60 ℃, 65 ℃ or 70 ℃.
Preferably, the unsaturated flue gas is discharged from a smoke exhaust duct.
Preferably, the method further comprises step (4):
(4) and cooling liquid collected by the circulating cooling liquid collector is introduced into the cooling liquid collecting box, is sent into the circulating cooler through the cooling circulating pump for heat exchange and cooling, and is then circularly introduced into the cooling spraying layer for spraying.
According to the invention, the flue gas is preferably cooled by spraying after the circulating cooling liquid is collected and cooled, a mode of directly cooling the flue gas in the prior art is replaced, an indirect cooling mode of cooling the circulating cooling liquid is adopted, the discharged circulating cooling liquid has good water quality, and can be used as water supplement of a desulfurization washing tower, so that the resource utilization rate is improved.
The flow rate and temperature of the circulating cooling liquid are not particularly limited, and it should be understood by those skilled in the art that the flow rate and temperature of the circulating cooling liquid are determined according to the flow rate and temperature of the flue gas, and those skilled in the art can obtain the flow rate and temperature of the flue gas according to the process calculation.
The flow rate of cooling water, the temperature of the feeding water and the temperature of the return water in the circulating cooler are also not particularly limited, and those skilled in the art should understand that the flow rate of the cooling water, the temperature of the feeding water and the temperature of the return water depend on the flow rate and the temperature of the circulating cooling liquid, and those skilled in the art can obtain the flow rate and the temperature of the flue gas according to the process calculation.
Preferably, a part of the coolant in the coolant collection tank is discharged from the system by a condensate discharge pump.
Preferably, the outlet flow rate of the condensate discharging pump is the same as the condensate flow rate generated when the flue gas is sprayed through the cooling spraying layer.
The outlet flow of the condensate discharge pump is consistent with the condensate flow generated when the flue gas is sprayed by the cooling spraying layer, so that the water balance in the desulfurization washing tower is better ensured.
As a preferred technical scheme of the invention, the method comprises the following steps:
(1) the smoke exchanges heat with air through a smoke-air heat exchanger to reduce the temperature;
(2) the cooled flue gas enters a desulfurization washing tower, and is subjected to spray desulfurization by a plurality of desulfurization spray layers, demisting by a desulfurization demister, spraying by a cooling spray layer and demisting by a cooling demister in sequence to obtain clean flue gas, wherein the flue gas generates condensate when being sprayed by the cooling spray layer, the desulfurization spray liquid sprayed by the desulfurization spray layer flows into a slurry tank at the bottom of the desulfurization washing tower, and the desulfurization spray liquid in the slurry tank is circulated to the desulfurization spray layer by a desulfurization circulating pump for recycling;
(3) the purified flue gas enters a flue gas-air mixer to be mixed with the air subjected to heat exchange in the step (1) to become unsaturated flue gas, and then the unsaturated flue gas is discharged from a smoke discharge pipeline;
(4) and cooling liquid collected by the circulating cooling liquid collector is introduced into a cooling liquid collecting box, wherein the cooling liquid is sent into a circulating cooler through a cooling circulating pump for heat exchange and cooling, then is circulated and introduced into a cooling spraying layer for cooling and spraying, and condensate in the cooling liquid collecting box is discharged out of the system through a condensate discharge pump.
The invention uses the environment temperature of 3-20 ℃, the processing temperature of 140-180 ℃, and the flow rate of 90000-100000 Nm3The smoke of/h is taken as an example to illustrate a specific wet smoke plume treatment method, which comprises the following steps:
(1) the temperature is 140-180 ℃, and the flow rate is 90000-100000 Nm3The temperature of the smoke is lowered to 110-135 ℃ through heat exchange between the smoke and air through a smoke-air heat exchanger and air, wherein the flow rate of the air is 10000-30000 Nm3The initial temperature is 3-20 ℃, and the temperature after heat exchange is 80-130 ℃;
(2) the cooled flue gas enters a desulfurization washing tower and sequentially passes through a plurality of desulfurization spraying layers for spray desulfurization, desulfurization demister demisting, cooling spraying layer for spray and cooling demister demisting to obtain clean flue gas, wherein the temperature of the flue gas after being demisted by the desulfurization demister is 50-65 ℃, the temperature after being demisted by the cooling demister is 30-48 ℃, condensate is generated at 2.0-3.0 t/h when the flue gas is sprayed by the cooling spraying layers, the desulfurization spraying liquid sprayed by the desulfurization spraying layers flows into a slurry tank at the bottom of a desulfurization washing tower, and the desulfurization spraying liquid in the slurry tank is circulated to the desulfurization spraying layers through a desulfurization circulating pump for recycling;
(3) the clean flue gas enters a flue gas-air mixer to be mixed with the air subjected to heat exchange in the step (1) to become unsaturated flue gas with the temperature of 50-60 ℃ and then is discharged from a smoke discharge pipeline;
(4) the cooling liquid collected by the circulating cooling liquid collector is 460-560 m3Introducing the mixture into a cooling liquid collecting box, wherein the temperature is 44-50 ℃, and the flow rate is 450-550 m3The cooling liquid per hour is sent into a circulating cooler through a cooling circulating pump for heat exchange and is cooled to 38-43 ℃, then the cooling liquid is circularly introduced into a cooling spraying layer for cooling spraying, condensate with the flow rate of 2.0-3.0 t/h in a cooling liquid collecting box is discharged out of the system through a condensate discharging pump, wherein the flow rate of the cooling water in the circulating cooler is 110-140 m3And h, the water supply temperature of the cooling water of the circulating cooler is 28-32 ℃, and the water return temperature is 36-44 ℃.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) the wet smoke plume processing device provided by the invention can realize the cooling and heating of the smoke without arranging a smoke cooler and a smoke heater in the desulfurization washing tower, and the equipment volume is small;
(2) the wet smoke plume processing device is particularly suitable for the reconstruction of a chimney project arranged on the top of a desulfurization tower, does not need to additionally arrange a heat exchanger on the top of the tower, and has small construction amount;
(3) the wet smoke plume processing device provided by the invention also has the advantages that the desulphurization demister is arranged between the cooling section and the desulphurization section of the desulphurization washing tower, so that the circulating cooling liquid is cleaner, the discharged cooling liquid can be used as supplementary water or other industrial water of the desulphurization washing tower, and the energy consumption is reduced;
(4) the wet smoke plume processing method provided by the invention heats the clean smoke by using the waste heat of the smoke, not only has good processing effect on the wet smoke plume, but also greatly reduces the energy consumption, simultaneously, the cooling liquid is separately collected and recycled, the cooling liquid is prevented from directly entering a desulfurization system, the water balance of the system is not influenced, and simultaneously, the resources are saved.
Drawings
Fig. 1 is a schematic view of a wet smoke plume processing apparatus provided in embodiment 1 of the present invention.
In the figure: 1-a desulfurization washing tower; 2-a smoke exhaust pipeline; 3-cooling the demister; 4-cooling the spray layer; 5-a circulating cooling liquid collector; 6-a desulfurization demister; 7-desulfurization spraying layer; 8-a flue gas inlet; 9-a pulp tank; 10-desulfurization circulating pump; 11-a smoke and air mixer; 12-a smoke-air heat exchanger; 13-a blower; 14-coolant collection tank; 15-cooling circulation pump; 16-a circulation cooler; 17-condensate removal pump.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
First, an embodiment
Example 1
The embodiment provides a wet smoke plume processing device, as shown in fig. 1, the device includes a smoke heat exchange device, a smoke purification device and a circulating cooling device which are connected in sequence;
the flue gas purification device comprises: the device comprises a desulfurization washing tower 1, wherein the desulfurization washing tower 1 sequentially comprises a cooling section, a desulfurization demister 3, a desulfurization section and a slurry pool 9 from top to bottom, the top of the desulfurization washing tower 1 is provided with a smoke outlet, and a smoke exhaust pipeline 2 is arranged on the smoke outlet; the cooling section is sequentially provided with a cooling demister 3, a cooling spray layer 4 and a circulating cooling liquid collector 5 from top to bottom, and the desulfurization section is provided with 3 desulfurization spray layers 7; a flue gas inlet 8 is formed in one side of the tower body of the desulfurization washing tower 1 between the desulfurization section and the slurry tank 9; 3 desulfurization circulating pumps 10 are arranged outside the desulfurization washing tower 1, and outlets of the desulfurization circulating pumps 10 are connected with the desulfurization spraying layer 7;
flue gas heat transfer device includes: a smoke-air mixer 11 arranged at the smoke exhaust pipeline 2 of the desulfurization washing tower 1, a smoke-air heat exchanger 12 arranged in front of the desulfurization washing tower 1 and a blower 13; the smoke-air heat exchanger 12 comprises an air outlet, an air inlet, a smoke outlet and a smoke inlet, wherein the smoke outlet is connected with the smoke inlet 8 of the desulfurization washing tower 1, the air outlet is connected with the smoke-air mixer 11, and the air inlet is connected with the blower 13;
the circulation cooling device includes: a cooling liquid collection tank 14, a cooling circulation pump 15 and a circulation cooler 16 which are connected in sequence, and a condensate discharge pump 17 arranged at the bottom outlet of the cooling liquid collection tank 14; the cooling liquid collecting box 14 is connected with the circulating cooling liquid collector 5 in the desulfurization washing tower 1, the cooling circulating pump 15 is connected with the middle part of the cooling liquid collecting box 14, the circulating cooler 16 is provided with a condensed water inlet, a condensed water outlet, a circulating cooling liquid inlet and a circulating cooling liquid outlet, and the circulating cooling liquid outlet is connected with the cooling spraying layer 4 in the desulfurization washing tower 1.
Second, application example
Application example 1
The application example provides a wet smoke plume processing method, and the method utilizes the device provided in embodiment 1 to perform wet smoke plume processing, and specifically comprises the following steps:
(1) at a temperature of 150 ℃ and a flow rate of 100000Nm3The temperature of the smoke is lowered to 130 ℃ through heat exchange between the smoke and air through a smoke-air heat exchanger and air, wherein the flow rate of the air is 20000Nm3The initial temperature is 10 ℃, and the temperature after heat exchange is 110 ℃;
(2) the cooled flue gas enters a desulfurization washing tower and sequentially passes through 3 desulfurization spraying layers for spray desulfurization, desulfurization demister demisting, cooling spraying layer for spray and cooling demister demisting to obtain clean flue gas, wherein the demisting temperature of the flue gas after the desulfurization demister is 50 ℃, the demisting temperature of the flue gas after the cooling demister is 45 ℃, the flue gas generates condensate at 2.5t/h when being sprayed by the cooling spraying layer, the desulfurization spraying liquid sprayed by the desulfurization spraying layer flows into a slurry tank at the bottom of the desulfurization washing tower, and the desulfurization spraying liquid in the slurry tank is circulated to the desulfurization spraying layer through a desulfurization circulating pump for recycling;
(3) the purified flue gas enters a flue gas-air mixer to be mixed with the air subjected to heat exchange in the step (1) to form unsaturated flue gas with the temperature of 56 ℃ and then is discharged from a smoke discharge pipeline;
(4) the cooling liquid collected by the cooling liquid collector was circulated at 502.5m3The mixture is led into a cooling liquid collecting box, wherein the temperature is 45.6 ℃, and the flow rate is 500m3Cooling liquid of/h is sent into a circulating cooler through a cooling circulating pump for heat exchange and is cooled to 43 ℃, then the cooling liquid is circularly introduced into a cooling spraying layer for cooling spraying, condensate with the flow of 2.5t/h in a cooling liquid collecting box is discharged out of the system through a condensate discharging pump, wherein the flow of the cooling water in the circulating cooler is 135m3And h, the water supply temperature of the cooling water of the circulating cooler is 25 ℃, and the water return temperature is 35 ℃.
The application example can realize that the final discharge temperature of unsaturated flue gas is 56 ℃ and the moisture content is 7.8 v% at the environment temperature of 10 ℃, and no visible white smoke exists at the outlet of the chimney, thereby thoroughly eliminating the trailing phenomenon of wet smoke plume.
Application example 2
The application example provides a wet smoke plume processing method, and the method utilizes the device provided in embodiment 1 to perform wet smoke plume processing, and specifically comprises the following steps:
(1) at a temperature of 200 ℃ and a flow rate of 500000Nm3The temperature of the smoke is reduced to 165 ℃ through heat exchange between the smoke and air through a smoke-air heat exchanger and air, wherein the flow rate of the air is 130000Nm3The initial temperature is 0 ℃, and the temperature after heat exchange is 150 ℃;
(2) the cooled flue gas enters a desulfurization washing tower and sequentially passes through 3 desulfurization spraying layers for spray desulfurization, desulfurization demister demisting, cooling spraying layer for spray and cooling demister demisting to obtain clean flue gas, wherein the demisting temperature of the flue gas after the desulfurization demister is 55 ℃, the demisting temperature of the flue gas after the cooling demister is 42 ℃, condensate is generated at 35t/h when the flue gas is sprayed through the cooling spraying layer, the desulfurization spraying liquid sprayed by the desulfurization spraying layer flows into a slurry tank at the bottom of a desulfurization washing tower, and the desulfurization spraying liquid in the slurry tank is circulated to the desulfurization spraying layer through a desulfurization circulating pump for recycling;
(3) the purified flue gas enters a flue gas-air mixer to be mixed with the air subjected to heat exchange in the step (1) to form unsaturated flue gas with the temperature of 63 ℃ and then is discharged from a smoke discharge pipeline;
(4) circulating the cooling liquid collected by the cooling liquid collector to 2035m3The cooling liquid is led into a cooling liquid collecting box, wherein the temperature is 47.3 ℃, and the flow rate is 2000m3Cooling liquid of/h is sent into a circulating cooler through a cooling circulating pump for heat exchange and is cooled to 38 ℃, then the cooling liquid is circularly introduced into a cooling spraying layer for cooling spraying, condensate with the flow rate of 35t/h in a cooling liquid collecting box is discharged out of a system through a condensate discharging pump, wherein the flow rate of cooling water in the circulating cooler is 1450m3And h, the water supply temperature of the cooling water of the circulating cooler is 25 ℃, and the water return temperature is 38 ℃.
The application example can realize that the final discharge temperature of unsaturated flue gas is 63 ℃ and the moisture content is 6.4 v% at the ambient temperature of 0 ℃, and no visible white smoke exists at the outlet of the chimney, thereby thoroughly eliminating the trailing phenomenon of wet smoke plume.
In conclusion, the wet smoke plume processing device provided by the invention has the advantages that the desulfurization demister is arranged between the cooling section and the desulfurization section of the desulfurization washing tower in the smoke purification device, so that a condenser and a heater are not required to be arranged in the desulfurization washing tower, the equipment is simple, and the load of a circulating cooling device is reduced; the wet smoke plume treatment method applying the device can carry out wet smoke plume treatment aiming at different smoke gases and environment temperatures, no visible white smoke exists at the outlet of the chimney, and the trailing phenomenon of the wet smoke plume can be thoroughly eliminated; meanwhile, the method reduces the saturation of the smoke by adopting a mode of spraying the condensed smoke by the circulating cooling liquid and mixing the smoke with air, reduces the energy consumption and has higher industrial application value.
The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A wet smoke plume treatment device is characterized by comprising a smoke heat exchange device, a smoke purification device and a circulating cooling device which are sequentially connected;
the flue gas purification device comprises a desulfurization washing tower, and the desulfurization washing tower sequentially comprises a cooling section and a desulfurization section from top to bottom;
and a desulfurization demister is arranged between the cooling section and the desulfurization section.
2. The device of claim 1, wherein a cooling demister, a cooling spray layer and a circulating cooling liquid collector are sequentially arranged in the cooling section of the desulfurization washing tower from top to bottom;
preferably, a desulfurization spraying layer is arranged at a desulfurization section in the desulfurization washing tower;
preferably, the number of desulfurization spray layers is at least 1, preferably 3;
preferably, the bottom of the desulfurization washing tower is a slurry tank;
preferably, a flue gas inlet is formed in one side of the tower body of the desulfurization washing tower between the desulfurization section and the slurry tank;
preferably, the flue gas purification device further comprises a desulfurization circulating pump arranged outside the desulfurization washing tower;
preferably, the number of desulfurization circulating pumps is at least 1, preferably 3;
preferably, the outlet of the desulfurization circulating pump is connected with a desulfurization spraying layer;
preferably, the top of the desulfurization washing tower is provided with a smoke outlet;
preferably, a smoke exhaust pipeline is installed on the smoke outlet.
3. The apparatus of claim 2, wherein the flue gas heat exchange device comprises a flue gas air mixer disposed at a flue gas duct of the desulfurization scrubber;
preferably, the flue gas heat exchange device further comprises a flue gas-air heat exchanger arranged in front of the desulfurization washing tower;
preferably, the smoke-air heat exchanger comprises an air outlet, an air inlet, a smoke outlet and a smoke inlet;
preferably, the flue gas heat exchange device further comprises a blower connected with an air inlet of the flue gas-air heat exchanger;
preferably, the flue gas outlet of the flue gas-air heat exchanger is connected with the flue gas inlet of the desulfurization washing tower;
preferably, the air outlet of the smoke-air heat exchanger is connected with the smoke-air mixer.
4. The apparatus according to claim 2 or 3, wherein the circulation cooling apparatus comprises a cooling liquid collection tank, a cooling circulation pump and a circulation cooler connected in sequence, the cooling circulation pump being connected to the middle of the cooling liquid collection tank;
preferably, the circulation cooler is provided with a condensed water inlet, a condensed water outlet, a circulating cooling liquid inlet and a circulating cooling liquid outlet;
preferably, a circulating cooling liquid outlet of the circulating cooler is connected with a cooling spraying layer in the desulfurization washing tower;
preferably, the cooling liquid collecting box is connected with a circulating cooling liquid collector in the desulfurization washing tower;
preferably, the circulation cooling device further comprises a condensate discharge pump arranged at a bottom outlet of the coolant collection tank.
5. A method for treating a wet smoke plume, which comprises using the wet smoke plume treatment apparatus according to any one of claims 1 to 4.
6. The method according to claim 5, characterized in that it comprises the steps of:
(1) the flue gas is subjected to heat exchange and temperature reduction through a flue gas heat exchange device;
(2) and the cooled flue gas enters a desulfurization washing tower, and is subjected to desulfurization in a desulfurization section, demisting in a desulfurization demister and cooling in a cooling section in sequence to obtain clean flue gas.
7. The method according to claim 6, wherein in the step (1), the flue gas exchanges heat with air through a flue-air heat exchanger to reduce the temperature;
preferably, the flue gas exchanges heat with ambient air through a flue gas-air heat exchanger to reduce the temperature.
8. The method according to claim 6 or 7, wherein the desulfurization section desulfurization in the step (2) is desulfurization spray-layer spray desulfurization;
preferably, the spray desulfurization through the desulfurization spray layer is spray desulfurization through a plurality of desulfurization spray layers, preferably 3 layers;
preferably, the desulfurization spraying liquid sprayed by the desulfurization spraying layer flows into a slurry tank at the bottom of the desulfurization washing tower;
preferably, the desulfurization spraying liquid in the slurry tank is circulated to the desulfurization spraying layer through a desulfurization circulating pump for recycling;
preferably, the cooling section cooling comprises a step of spraying through a cooling spraying layer;
preferably, the flue gas is condensed to produce condensate when being sprayed by the cooling spraying layer;
preferably, the cooling section cooling further comprises a demisting step of the cooling demister after the cooling spray layer is sprayed.
9. The method according to any one of claims 6 to 8, further comprising step (3):
(3) the purified flue gas enters a flue gas-air mixer to be mixed with the air subjected to heat exchange in the step (1) to form unsaturated flue gas, and then the unsaturated flue gas is discharged;
preferably, the unsaturated flue gas is discharged from a smoke exhaust duct;
preferably, the method further comprises step (4):
(4) cooling liquid collected by the circulating cooling liquid collector is introduced into the cooling liquid collecting box, is sent into a circulating cooler through a cooling circulating pump for heat exchange and cooling, and is then circularly introduced into a cooling spraying layer for spraying;
preferably, part of the cooling liquid in the cooling liquid collecting tank is discharged out of the system through a condensate discharge pump;
preferably, the outlet flow rate of the condensate discharging pump is the same as the condensate flow rate generated when the flue gas is sprayed through the cooling spraying layer.
10. A method according to any one of claims 5 to 9, characterized in that the method comprises the steps of:
(1) the smoke exchanges heat with air through a smoke-air heat exchanger to reduce the temperature;
(2) the cooled flue gas enters a desulfurization washing tower, and is subjected to spray desulfurization by a plurality of desulfurization spray layers, demisting by a desulfurization demister, spraying by a cooling spray layer and demisting by a cooling demister in sequence to obtain clean flue gas, wherein the flue gas generates condensate when being sprayed by the cooling spray layer, the desulfurization spray liquid sprayed by the desulfurization spray layer flows into a slurry tank at the bottom of the desulfurization washing tower, and the desulfurization spray liquid in the slurry tank is circulated to the desulfurization spray layer by a desulfurization circulating pump for recycling;
(3) the purified flue gas enters a flue gas-air mixer to be mixed with the air subjected to heat exchange in the step (1) to become unsaturated flue gas, and then the unsaturated flue gas is discharged from a smoke discharge pipeline;
(4) and cooling liquid collected by the circulating cooling liquid collector is introduced into a cooling liquid collecting box, wherein the cooling liquid is sent into a circulating cooler through a cooling circulating pump for heat exchange and cooling, then is circulated and introduced into a cooling spraying layer for cooling and spraying, and condensate in the cooling liquid collecting box is discharged out of the system through a condensate discharge pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911168553.7A CN112827328A (en) | 2019-11-25 | 2019-11-25 | Wet smoke plume processing device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911168553.7A CN112827328A (en) | 2019-11-25 | 2019-11-25 | Wet smoke plume processing device and method |
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| CN112827328A true CN112827328A (en) | 2021-05-25 |
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