CN214360347U - System for evaporating desulfurization wastewater by utilizing waste heat in flue - Google Patents
System for evaporating desulfurization wastewater by utilizing waste heat in flue Download PDFInfo
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- CN214360347U CN214360347U CN202022406628.5U CN202022406628U CN214360347U CN 214360347 U CN214360347 U CN 214360347U CN 202022406628 U CN202022406628 U CN 202022406628U CN 214360347 U CN214360347 U CN 214360347U
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Abstract
The utility model provides a system for evaporating desulfurization wastewater by utilizing waste heat in a flue, which comprises an air preheater, a flue, an electrostatic precipitator and a desulfurizing tower which are arranged in sequence along the circulation direction of flue gas; the desulfurization tower is connected with the triple box to obtain pretreated desulfurization wastewater; the air preheater is used for generating hot secondary air by utilizing the waste heat of the flue gas; a desulfurization wastewater atomization component is arranged in the flue, and the triple box is communicated with the desulfurization wastewater atomization component; a first hot secondary air injection pipe assembly is further arranged in the flue, transversely arranged at the bottom of the flue and connected with the air preheater; the electrostatic precipitator is used for catching crystal salt and dust in flue gas formed after the desulfurization wastewater is dried. The utility model discloses simple structure, it is convenient to make, can effectively improve the evaporation of desulfurization waste water and the precipitation of crystal salt, avoids flue bottom and electrostatic precipitator's corruption, has also practiced thrift the cost simultaneously, and the practicality is high.
Description
Technical Field
The utility model belongs to the technical field of energy utilization and environmental protection, concretely relates to utilize system of waste heat evaporation desulfurization waste water in flue.
Background
The flue evaporation zero-emission treatment is that the desulfurization wastewater is pumped and sprayed into a high-temperature flue between an air preheater of a power plant and an electric dust collector, the wastewater after spray refinement is evaporated by using high-temperature flue gas, and solid matters remained after liquid drops are evaporated are captured by an electrostatic dust collector. The desulfurization wastewater zero-discharge method has the advantages of simple process, simple equipment, low investment, small occupied area and the like, but the key point of the method is to ensure that the sprayed desulfurization wastewater is completely evaporated before entering the electrostatic precipitator, and the temperature of the evaporated flue gas is required to be higher than the acid dew point, otherwise, internal components such as an electrode plate of the electrostatic precipitator and the like can be corroded. Part of the waste water drops collide with the wall surface of the flue before being completely evaporated, so that the wall surface of the flue must be subjected to corrosion prevention measures. If the evaporation amount of the desulfurization waste water is large, the temperature of the flue gas before entering the electrostatic precipitator is too low and is lower than the acid dew point of the flue gas, so that the internal components such as an electrode plate of the electrostatic precipitator and the like are corroded.
Research has shown that coalescence (also known as coalescence) of particle populations within the flue is one of the most common and critical events in the evolution of fine particulates. Coalescence is the process in which two or more particles in a particle group collide with each other due to relative motion and are bonded together to form particles of a larger size. The spraying liquid of the desulfurization wastewater flue treatment system is dripped to accelerate the coalescence and evolution of particle groups in the dust-containing flue. The accelerated drying of the crystallized salt before the crystallization of the particles can effectively reduce the coalescence of the particles.
The deposited layer at the bottom of the flue is mutually influenced by particle coalescence. The research shows that the particle size in the flue is increased due to coalescence, the deposition in the flue is mainly based on gravity deposition, and as the spray amount is increased, the ash deposition phenomenon begins to occur in the flue. At present, the deposited dust in the flue is rarely treated correspondingly.
Researches show that the flow direction of flue gas in the electrostatic dust collector has great influence on the efficiency of the electrostatic dust collector, the best design scheme is to enable the flue gas to enter the electrostatic dust collector obliquely and upwards, the traditional electrostatic dust collector is designed to arrange a plurality of rows of perforated airflow distribution plates at the inlet of the electrostatic dust collector, and the pressure of the flue gas is changed according to the sizes of the perforations of the airflow distribution plates, so that the flow direction of the flue gas is changed. However, this method increases the resistance of the flue gas, and the openings of the air flow distribution plate are easily blocked by dust, so that the flow direction of the flue gas changes, which affects the efficiency of the electrostatic precipitator.
In conclusion, the existing desulfurization wastewater zero-discharge system is prone to depositing dust at the bottom of a flue due to incomplete evaporation of desulfurization wastewater, and is prone to corroding an electrostatic dust collector after the temperature is reduced, and meanwhile, an airflow distribution plate of the electrostatic dust collector is prone to being blocked by dust.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an utilize system of waste heat evaporation desulfurization waste water in flue to solve at least that the desulfurization waste water dropping liquid evaporation in the present flue does not lead to the liquid drop completely to corrode the flue or at flue bottom deposition, the temperature reduces the problem that easily causes the corruption to electrostatic precipitator simultaneously.
In order to achieve the above object, the present invention provides the following technical solutions:
a system for evaporating desulfurization wastewater by using waste heat in a flue comprises an air preheater, the flue, an electrostatic dust collector and a desulfurization tower which are sequentially arranged along the circulation direction of flue gas;
the desulfurization tower is connected with the triple box, and the triple box is used for pretreating desulfurization wastewater in the desulfurization tower to obtain pretreated desulfurization wastewater;
the air preheater is used for generating hot secondary air by utilizing the waste heat of the flue gas;
a desulfurization wastewater atomization component is arranged in the flue, and the triple box is communicated with the desulfurization wastewater atomization component;
the first hot secondary air injection pipe assembly is transversely arranged at the bottom of the flue and is connected with the air preheater so as to inject the hot secondary air upwards in the flue;
the electrostatic precipitator is used for catching crystal salt and dust in flue gas formed after the desulfurization wastewater is dried.
In the system for evaporating desulfurization wastewater by using residual heat in a flue, preferably, a second hot secondary air injection pipe assembly connected with the air preheater and arranged at the tail part of the flue is further arranged in the flue, and a second hot air nozzle for injecting the hot secondary air obliquely upwards towards the electrostatic dust collector is arranged on the second hot secondary air injection pipe assembly;
the spraying direction of the second hot air nozzle is inclined upwards by an angle of 45 degrees;
the air preheater is also connected with a hot secondary air supply system so as to supply hot secondary air generated by the air preheater to the first hot secondary air injection pipe assembly and the second hot secondary air injection pipe assembly.
In the above system for evaporating desulfurization wastewater by using residual heat in a flue, preferably, the desulfurization wastewater atomization component is further connected with a compressed air communication pipeline, and the atomization mode of the desulfurization wastewater atomization component is compressed air flow atomization, high pressure atomization or rotary atomization.
In the above system for evaporating desulfurization wastewater by using residual heat in a flue, preferably, the desulfurization wastewater atomization component is arranged perpendicular to the axis of the flue and fixed on the wall of the head part of the flue, and the desulfurization wastewater atomization component comprises a desulfurization wastewater inlet pipeline, a desulfurization wastewater collection tank and a desulfurization wastewater atomization pipe group which are sequentially communicated;
the desulfurization waste water atomization pipe group comprises a plurality of desulfurization waste water atomization pipelines which are arranged in parallel, and at least one atomization nozzle is arranged in the desulfurization waste water atomization pipeline along the length direction;
the spraying direction of the atomizing nozzle faces to the flowing direction of the flue gas.
In the system for evaporating desulfurization wastewater by using waste heat in a flue, preferably, the desulfurization wastewater atomization component comprises a plurality of groups, and the plurality of groups of desulfurization wastewater atomization components are arranged in parallel.
In the system for evaporating desulfurization wastewater by using waste heat in a flue as described above, preferably, the first hot secondary air injection pipe assembly includes a first hot secondary air inlet pipeline, a first hot secondary air header and a first hot secondary air injection pipe group which are sequentially communicated;
the first hot secondary air injection pipe group comprises a plurality of first hot secondary air injection pipelines, the first hot secondary air injection pipelines are arranged in parallel, and at least one first hot air nozzle is arranged on each first hot secondary air injection pipeline along the length direction.
In the above system for evaporating desulfurization wastewater using residual heat in a flue, preferably, the injection direction of the first hot air nozzle is vertically upward.
In the above system for evaporating desulfurization wastewater by using residual heat in a flue, preferably, the second hot secondary air injection pipe assembly is arranged perpendicular to the axis of the flue and is fixed on the pipe wall at the tail part of the flue, and the second hot secondary air injection pipe assembly comprises a second hot secondary air inlet pipeline, a second hot secondary air header and a second hot secondary air injection pipe group which are sequentially communicated;
the second hot secondary air injection pipe group comprises a plurality of second hot secondary air injection pipelines, the second hot secondary air injection pipelines are arranged in parallel, and at least one second hot air nozzle is arranged on each second hot secondary air injection pipeline along the length direction.
Compared with the closest prior art, the utility model provides a technical scheme has following excellent effect:
the utility model ensures that the desulfurization waste water in the flue is fully evaporated before entering the electrostatic dust collector, avoids the corrosion of the electrostatic dust collector caused by incomplete evaporation of the desulfurization waste water, avoids the corrosion of the wet crystallized salt scale with higher moisture content on the wall surface of the flue, integrates the salt and the metal wall surface, and avoids the continuous bonding of the hardened crystallized salt to grow up or even block the flue;
fully disturbing crystals generated in the evaporation process of the desulfurization wastewater in the flue, so that the crystals are evaporated more thoroughly, reducing large-particle crystals generated by coalescence, and destroying a laminar boundary layer in the flue, thereby reducing the phenomenon that the crystals form dust deposition at the bottom of the flue due to the action of gravity and block the flue;
at electrostatic precipitator entrance, hot overgrate air promotes the flow direction that the flue gas changes the flue gas, make the flue gas direction slope that gets into electrostatic precipitator upwards, reduce the secondary raise dust in the electrostatic precipitator, improve electrostatic precipitator's efficiency, improve the flue gas temperature in the electrostatic precipitator simultaneously, the compensation is because the flue gas temperature that the evaporation of desulfurization waste water arouses reduces, thereby avoid the corruption of parts such as electrostatic precipitator internal electrode plate, airflow distribution plate's setting among the electrostatic precipitator has been saved, avoid airflow distribution plate's jam, guarantee electrostatic precipitator safe efficient operation, the cost is also practiced thrift simultaneously, but the high practicality of high installation.
Drawings
The accompanying drawings, which form a part of the present application, 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. Wherein:
FIG. 1 is a flow chart of a system for evaporating desulfurization waste water by using waste heat in a flue according to an embodiment of the present invention;
FIG. 2 is a top view of the stack of FIG. 1;
FIG. 3 is a side view of the desulfurized wastewater atomization assembly of FIG. 1;
FIG. 4 is an elevation view of the first hot overfire air injection tube assembly of FIG. 1;
fig. 5 is a side view of the second hot secondary air injection tube assembly of fig. 1.
In the figure: 1. air heater, 1.1, first control valve, 1.2, second control valve, 2, electrostatic precipitator, 3, desulfurizing tower, 4, the triplex case, 5, desulfurization waste water atomization component, 5.1, desulfurization waste water inlet pipeline, 5.2, desulfurization waste water collection case, 5.3, desulfurization waste water atomization pipeline, 5.4, atomizing nozzle, 6, first hot overgrate air injection pipe subassembly, 6.1, first hot overgrate air inlet pipeline, 6.2, first hot overgrate air collection case, 6.3, first hot overgrate air injection pipeline, 6.4, first hot air nozzle, 7, second hot overgrate air injection pipe subassembly, 7.1, second hot overgrate air inlet pipeline, 7.2, second hot overgrate air collection case, 7.3, second hot overgrate air injection pipeline, 7.4, second hot air nozzle, 8, flue, 9, compressed air.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, and may be, for example, either fixed or detachable; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The utility model discloses at 2 entrances of electrostatic precipitator, change 8 interior air currents flow state in the flue for the evaporation of desulfurization waste water makes 2 entry front air currents of electrostatic precipitator incline upwards, and the flue gas forms oblique air current in 2 electrostatic precipitator, secondary raise dust in can effectual reduction electrostatic precipitator 2.
The utility model discloses consider the abundant degree of desulfurization waste water evaporation in the flue 8 to and the temperature of flue gas when getting into electrostatic precipitator 2, still considered the problem of 8 bottom deposition of flue before the flue gas gets into electrostatic precipitator 2 simultaneously. After desulfurization waste water gets into flue 8, evaporate waste water spray by the flue gas waste heat in the flue 8, before spray crystallization, add the hot overgrate air of higher temperature, further evaporate waste water spray, the while disturbs the flow of the granule of crystallization, flue gas bottom laminar flow boundary layer has been destroyed, the crystallization salt of having avoided big granule falls flue 8 bottom under the effect of gravity and forms the deposit layer, 2 entrances at electrostatic precipitator, hot overgrate air promotes the flow direction that the flue gas changes the flue gas, the flue gas direction slope that makes entering electrostatic precipitator 2 is upwards, be favorable to the improvement of 2 efficiency of electrostatic precipitator. Meanwhile, the addition of hot secondary air ensures that the temperature of the flue gas entering the electrostatic dust collector 2 is above the acid dew point, and internal components such as an electrode plate of the electrostatic dust collector 2 are protected from being corroded.
As shown in fig. 1 to 5, the embodiment of the utility model provides a system for evaporating desulfurization waste water by utilizing waste heat in a flue, the system comprises an air preheater 1, a flue 8, an electrostatic precipitator 2 and a desulfurizing tower 3 which are arranged in sequence along the direction of flue gas circulation.
Be provided with desulfurization waste water atomization component 5 in the flue 8, triplex box 4 and desulfurization waste water atomization component 5 intercommunication.
In the specific embodiment of the utility model, the desulfurization waste water atomization component 5 is also connected with a compressed air communication pipeline, the compressed air communication pipeline is communicated with the compressed air 9, and the atomization mode of the desulfurization waste water atomization component 5 is compressed air flow atomization, high pressure type atomization or rotary type atomization; the grain size of the drops of the desulfurized wastewater atomized by the desulfurized wastewater atomization component 5 is between 30 and 200 μm (for example, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm). The compressed air communicating pipeline is communicated with a gas phase inlet of the desulfurization waste water atomization component 5 through a gas pipeline.
Desulfurization waste water atomization component 5 perpendicular to 8 axis settings of flue, and fix on the flue gas head pipeline wall between air heater 1 and electrostatic precipitator 2, desulfurization waste water atomization component 5 is including desulfurization waste water inlet pipe way 5.1, desulfurization waste water header 5.2 and the desulfurization waste water atomizing nest of tubes that communicate in proper order. The desulfurization waste water header 5.2 is used for storing liquid.
Desulfurization waste water atomizing nest of tubes includes a plurality of desulfurization waste water atomization pipelines 5.3 that have the same shape, and desulfurization waste water header 5.2 and every desulfurization waste water atomization pipeline 5.3 intercommunication for balanced each desulfurization waste water atomization pipeline 5.3's pressure ensures that pressure is the same, realizes the same atomization effect. A plurality of desulfurization waste water atomization pipeline 5.3 are parallel to each other and set up, and desulfurization waste water atomization pipeline 5.3 has five in this embodiment, also can set up to other quantity in other embodiments, and desulfurization waste water atomization pipeline 5.3 is provided with at least one atomizing nozzle 5.4 along length direction, and atomizing nozzle 5.4's injection direction is towards the flow direction of flue gas. The size and the shape of the atomizing nozzle 5.4 are selected as required, the desulfurization wastewater atomization component 5 can be one layer or multiple layers, when the multiple layers are arranged, the layers are arranged in a parallel staggered manner, the desulfurization wastewater atomization component 5 arranged in multiple layers is vertically arranged, the desulfurization wastewater atomization pipeline 5.3 arranged in each layer is arranged in a staggered manner, the atomization nozzle 5.4 on the pipeline behind is prevented from being directly sprayed to the pipeline in front, and the spraying direction is in front. One or more atomizing nozzles 5.4 are adopted in each layer according to the actual evaporation capacity, and the arrangement mode of the atomizing nozzles 5.4 in each layer adopts regular arrangement or irregular arrangement.
The air preheater 1 is used for generating hot secondary air by utilizing the residual heat of the flue gas.
Be provided with first hot overgrate air injection pipe subassembly 6 in the flue 8, first hot overgrate air injection pipe subassembly 6 transversely sets up in the bottom of flue 8 to be connected with air heater 1, first hot overgrate air injection pipe subassembly 6 is used for upwards spraying hot overgrate air in flue 8, and desulfurization waste water evaporates under the effect of flue gas and hot overgrate air after the preliminary treatment and dries and form the salt of crystallization, is caught in electrostatic precipitator 2.
A second hot secondary air injection pipe assembly 7 connected with the air preheater 1 and arranged at the tail part of the flue 8 is also arranged in the flue 8, and a second hot air nozzle 7.4 with an injection direction facing the electrostatic dust collector 2 in an inclined upward direction is arranged on the second hot secondary air injection pipe assembly; preferably, the direction of the second hot air nozzle 7.4 is inclined upwards at an angle of 45 degrees.
The hot secondary air supply system is a blower connected with the air preheater, the hot secondary air used for supplying comes from the air heated by the air preheater 1, the temperature of the hot secondary air is about 400 ℃, the hot secondary air is led out to bypass into a flue 8 behind the air preheater 1, the hot secondary air respectively enters the flue 8 in two paths and is divided into a hot secondary air inlet pipeline I and a hot secondary air inlet pipeline II, the air volume entering the hot secondary air inlet pipeline I and the hot secondary air inlet pipeline II is respectively controlled by a first control valve 1.1 and a second control valve 1.2, the first control valve 1.1 controls the air volume entering a first hot secondary air injection pipe assembly 6, and the second control valve 1.2 controls the air volume entering a second hot secondary air injection pipe assembly 7.
Desulfurization waste water from a desulfurization tower 3 and treated by a triple box 4 is atomized in a flue 8 through a desulfurization waste water atomization component 5, atomized liquid drop groups move forward under the driving of smoke at the outlet of an air preheater 1, and simultaneously gradually evaporated under the action of smoke heat and crystallization salt begins to be separated out, a first hot secondary air injection pipe component 6 is arranged at the position where the atomized liquid drop groups begin to generate the crystallization salt, high-temperature hot secondary air is subjected to radial jet flow through the first hot secondary air injection pipe component, the hot secondary air jet flow sprayed by the first hot secondary air injection pipe component accelerates the separation of the crystallization salt in the area around the first hot secondary air injection pipe component 6, and the generated crystallization salt is further dried, so that the crystallization salt particles lose water and lose dirt-staining property.
In order to avoid large-particle crystallized salt to fall to the bottom of the flue 8 under the action of gravity to form a settled layer, the flow rate of flue gas is further influenced, hot secondary air is arranged along the direction of the flue 8, the spraying direction of the hot secondary air is vertical upward, a laminar boundary layer at the bottom of the flue gas is destroyed, the large-particle crystallized salt is prevented from falling to the bottom of the flue 8 under the action of gravity to form a settled layer, and therefore the normal and stable safe operation of a system is guaranteed. The crystallized salt in the flue gas fully disturbs and heats the drying, under the combined action of the horizontal driving force of flue gas and the perpendicular power of hot overgrate air, drives and continues to move forward, 2 entrances at electrostatic precipitator, hot overgrate air sprays at an angle of 45 degrees upwards in the slope, and the flue gas forms oblique air current in electrostatic precipitator 2 in the air current slope upwards under the effect of slope upward force, can effectual reduction electrostatic precipitator 2 in the secondary raise dust.
In a specific embodiment of the present invention, the first hot overfire air injection pipe assembly 6 comprises a first hot overfire air inlet pipeline 6.1, a first hot overfire air header 6.2 and a first hot overfire air injection pipe assembly which are sequentially communicated. The first hot secondary air header 6.2 is used for storing gas, the first hot secondary air injection pipe group comprises a plurality of first hot secondary air injection pipelines 6.3 with the same shape, and the first hot secondary air header 6.2 is communicated with each first hot secondary air injection pipeline 6.3 and used for balancing the pressure of each first hot secondary air injection pipeline 6.3, ensuring the same pressure and realizing the same injection effect. In the embodiment, five first hot secondary air injection pipelines 6.3 are provided, and other embodiments can be provided, the first hot secondary air injection pipelines 6.3 are transversely and uniformly arranged at the bottom of the flue 8, the plurality of first hot secondary air injection pipelines 6.3 are arranged in parallel, and the first hot secondary air injection pipelines 6.3 are provided with at least one first hot air nozzle 6.4 along the length direction; the first hot air nozzle 6.4 has a spray direction directed vertically upwards. The size and the shape of the small hole at the joint of the used nozzle or the nozzle are selected as required, so that the hot secondary air quantity and the rigidity of the jet flow are adjusted, the first hot secondary air injection pipe assembly 6 can be arranged in one layer or multiple layers according to the condition, the wet surface of the crystal particles generated by evaporative concentration of the desulfurization wastewater is ensured to be in a complete drying state, and the flue gas is fully disturbed, so that the crystals of the large particles cannot form dust deposition at the bottom of the flue 8 due to gravity. The first hot secondary air injection pipe assemblies 6 arranged in multiple layers are arranged in a parallel staggered mode, the first hot secondary air inlet pipelines 6.1 in each layer are arranged in a staggered mode, and the first hot air nozzles 6.4 on the pipelines behind are prevented from being directly injected to the pipelines in front.
Preferably, the first hot secondary air injection pipe assembly 6 is arranged at the bottom of the flue 8 below the desulfurization waste water atomization assembly so as to maximally dry and evaporate droplets of desulfurization waste water. The first hot secondary air injection pipe assembly 6 is fixed on the pipe wall at the bottom of the flue 8, and the axis of the first hot secondary air inlet pipeline 6.1 is vertical to the axis direction of the first hot secondary air injection pipeline 6.3, so that the first hot secondary air inlet pipeline 6.1 is connected with the first hot secondary air inlet pipeline, and hot secondary air is introduced.
The utility model discloses an in the concrete embodiment, the setting of second hot overgrate air injection pipe subassembly 7 perpendicular to flue 8 axis, and fix on the afterbody pipe wall of flue 8, second hot overgrate air injection pipe subassembly 7 is including the hot overgrate air inlet pipe way 7.1 of second, the hot overgrate air collection case 7.2 of second and the hot overgrate air injection pipe group of second that communicate in proper order. The second hot secondary air header 7.2 is used for storing gas, the second hot secondary air injection pipe group comprises a plurality of second hot secondary air injection pipes 7.3 with the same shape, and the second hot secondary air header 7.2 is communicated with each second hot secondary air injection pipe 7.3 and used for balancing the pressure of each second hot secondary air injection pipe 7.3, ensuring the same pressure and realizing the same injection effect. In this embodiment, there are five second hot secondary air injection pipes 7.3, and in other embodiments, there may be other numbers of second hot secondary air injection pipes 7.3, and a plurality of second hot secondary air injection pipes 7.3 are arranged in parallel, and at least one second hot air injection nozzle 7.4 is arranged in the second hot secondary air injection pipe 7.3 along the length direction. Preferably, the second hot air nozzle 7.4 is provided with a plurality of nozzles, which are uniformly distributed on the second hot secondary air injection duct 7.3. The magnitude of the injection pressure of the second hot air nozzles 7.4 increases from top to bottom. The axis of the second hot secondary air inlet pipeline 7.1 is vertically parallel to the axis of the second hot secondary air injection pipeline 7.3, so that the second hot secondary air inlet pipeline 7.1 is conveniently connected with the second hot secondary air inlet pipeline, and hot secondary air is introduced. The second hot secondary air injection pipe group is vertically arranged at the inlet of the electrostatic dust collector 2, the size and the shape of the second hot air nozzle 7.4 or a small hole connected with the nozzle are selected according to requirements, and the pressure is increased from top to bottom, so that the jet flow hot secondary air quantity and the rigidity are adjusted, and meanwhile, the scouring degree of the flue gas on the upper flue 8 and the upper part of the electrostatic dust collector 2 is also reduced. Thereby guarantee that the direction slope is upwards when the flue gas gets into electrostatic precipitator 2, reduce the secondary raise dust in the electrostatic precipitator 2, improve the interior flue gas temperature of electrostatic precipitator 2, the compensation is because the flue gas temperature that the evaporation of desulfurization waste water arouses reduces, thereby avoid the corruption of parts such as the plate electrode in the electrostatic precipitator 2, airflow distribution plate's setting among the electrostatic precipitator 2 has been saved, avoid airflow distribution plate's jam, guarantee the operation of 2 safe efficient of electrostatic precipitator, the cost has also been practiced thrift simultaneously, but the practicality of device is improved. One or more layers of the second hot secondary air injection pipe assemblies 7 can be adopted according to the conditions, the second hot secondary air injection pipe assemblies 7 arranged in multiple layers are arranged in a parallel staggered mode, the second hot secondary air inlet pipelines 7.1 in each layer are arranged in a staggered mode, and the situation that the first hot air nozzles 6.4 on the pipelines behind are directly injected to the pipelines in front is avoided.
The utility model also provides a method for utilize waste heat evaporation desulfurization waste water in the flue, including following step:
firstly, the desulfurization wastewater from a desulfurization tower 3 treated by a triple box 4 is atomized in a flue 8 through a desulfurization wastewater atomization component 5, atomized liquid drop groups move forward under the driving of flue gas at the outlet of an air preheater 1, and meanwhile, heat exchange is carried out by the air preheater 1 to form hot secondary air;
secondly, arranging a first hot secondary air injection pipe assembly 6 at the position where the atomized liquid drop group generates the crystallized salt, and generating a vertical upward hot air injection flow by hot secondary air through the first hot secondary air injection pipe assembly 6, so that the drying and the separation of the crystallized salt in the desulfurization wastewater are accelerated, and the large-particle crystallized salt is prevented from forming a deposition layer at the bottom of a flue 8;
and step three, arranging a second hot secondary air injection pipe assembly 7 at the tail part of the flue 8, generating hot air injection flow which obliquely faces the electrostatic dust collector 2 by hot secondary air through the second hot secondary air injection pipe assembly 7, and enabling mixed flue gas to enter the electrostatic dust collector 2 to form oblique air flow so as to reduce secondary dust in the electrostatic dust collector 2.
The system of the utility model is an independent module which integrates the primary flue gas, the desulfurization waste water atomization component and the hot secondary air injection component to replace the original flue so as to complete the whole process of atomization evaporation and drying in the desulfurization waste water flue; or the original flue is additionally provided with a desulfurization waste water atomization component and a hot secondary air injection component so as to complete flue spraying evaporation zero-emission treatment.
The temperature of primary flue gas is low, but the flue gas amount is large, so that the atomized desulfurization wastewater can be heated, vaporized and evaporated by integral jet flow, and salt in the desulfurization wastewater is crystallized and separated out; the hot secondary air injection assembly ensures that the atomized desulfurization wastewater jet flow or the liquid drop group is quickly evaporated and does not fall to the bottom of the flue under the action of gravity, so that the flue is prevented from being seriously corroded by the desulfurization wastewater, and the low-temperature flue gas temperature on the wall surface of the flue can be obviously improved to accelerate the evaporation process; the hot secondary air jet flow sprayed by the hot secondary air spraying assembly quickly evaporates and dries the surface of the crystallized salt, so that the crystallized salt is prevented from being adhered to the bottom of the flue under the action of gravity due to the fact that the surface of the crystallized salt is wet and increased, the wet crystallized salt scale with high moisture content on the wall surface of the flue is corroded, the salt and the metal wall surface are integrated, and the phenomenon that the hardened crystallized salt is continuously adhered to grow and even blocks the flue is avoided.
To sum up, the utility model discloses a system and method, the desulfurization waste water atomization component of adoption, the hot overgrate air of first injection subassembly and the hot overgrate air injection subassembly of second simple structure, it is convenient to make, sets up it in the flue, utilizes hot overgrate air and flue gas combined action, can effectively improve the evaporation of desulfurization waste water and the precipitation of crystallization salt, avoids the corruption of flue bottom and electrostatic precipitator, guarantees electrostatic precipitator safe efficient operation, has also practiced thrift the cost simultaneously, and the practicality is high.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A system for evaporating desulfurization wastewater by using waste heat in a flue is characterized by comprising an air preheater, a flue, an electrostatic precipitator and a desulfurization tower which are sequentially arranged along the circulation direction of flue gas;
the desulfurization tower is connected with the triple box, and the triple box is used for pretreating desulfurization wastewater in the desulfurization tower to obtain pretreated desulfurization wastewater;
the air preheater is used for generating hot secondary air by utilizing the waste heat of the flue gas;
a desulfurization wastewater atomization component is arranged in the flue, and the triple box is communicated with the desulfurization wastewater atomization component;
the first hot secondary air injection pipe assembly is transversely arranged at the bottom of the flue and is connected with the air preheater so as to inject the hot secondary air upwards in the flue;
the electrostatic precipitator is used for catching crystal salt and dust in flue gas formed after the desulfurization wastewater is dried.
2. The system for evaporating desulfurization waste water by using the residual heat in the flue as claimed in claim 1, wherein a second hot secondary air injection pipe assembly connected with the air preheater and arranged at the tail part of the flue is further arranged in the flue, and a second hot air nozzle for injecting the hot secondary air obliquely upwards towards the electrostatic precipitator is arranged on the second hot secondary air injection pipe assembly;
the spraying direction of the second hot air nozzle is inclined upwards by an angle of 45 degrees;
the air preheater is also connected with a hot secondary air supply system so as to supply hot secondary air generated by the air preheater to the first hot secondary air injection pipe assembly and the second hot secondary air injection pipe assembly.
3. The system for evaporating desulfurization waste water by using waste heat in a flue as set forth in claim 2, wherein the desulfurization waste water atomization assembly is further connected with a compressed air communication pipe, and the desulfurization waste water atomization assembly is used for atomizing compressed air in an air flow type, a pressure type or a rotary type.
4. The system for evaporating desulfurization waste water by using the waste heat in the flue as claimed in claim 3, wherein said desulfurization waste water atomization assembly is arranged perpendicular to the axis of the flue and fixed on the wall of the head portion of the flue, and said desulfurization waste water atomization assembly comprises a desulfurization waste water inlet pipeline, a desulfurization waste water header and a desulfurization waste water atomization pipe group which are sequentially communicated;
the desulfurization waste water atomization pipe group comprises a plurality of desulfurization waste water atomization pipelines which are arranged in parallel, and at least one atomization nozzle is arranged in the desulfurization waste water atomization pipeline along the length direction;
the spraying direction of the atomizing nozzle faces to the flowing direction of the flue gas.
5. The system for evaporating desulfurization waste water by using waste heat in a flue of claim 4, wherein the desulfurization waste water atomization assembly comprises a plurality of groups, and the groups of desulfurization waste water atomization assemblies are arranged in parallel.
6. The system for evaporating desulfurization waste water by using waste heat in a flue as claimed in any one of claims 1 to 5, wherein the first hot secondary air injection pipe assembly comprises a first hot secondary air inlet pipeline, a first hot secondary air header and a first hot secondary air injection pipe assembly which are sequentially communicated;
the first hot secondary air injection pipe group comprises a plurality of first hot secondary air injection pipelines, the first hot secondary air injection pipelines are arranged in parallel, and at least one first hot air nozzle is arranged on each first hot secondary air injection pipeline along the length direction.
7. The system for evaporating desulfurization waste water by using the residual heat in the flue as set forth in claim 6, wherein the spraying direction of the first hot air nozzle is vertically upward.
8. The system for evaporating desulfurization waste water by using the residual heat in the flue as claimed in any one of claims 2 to 5, wherein the second hot secondary air injection pipe assembly is arranged perpendicular to the axis of the flue and fixed on the wall of the tail portion of the flue, and the second hot secondary air injection pipe assembly comprises a second hot secondary air inlet pipeline, a second hot secondary air header and a second hot secondary air injection pipe assembly which are sequentially communicated;
the second hot secondary air injection pipe group comprises a plurality of second hot secondary air injection pipelines, the second hot secondary air injection pipelines are arranged in parallel, and at least one second hot air nozzle is arranged on each second hot secondary air injection pipeline along the length direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022406628.5U CN214360347U (en) | 2020-10-26 | 2020-10-26 | System for evaporating desulfurization wastewater by utilizing waste heat in flue |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022406628.5U CN214360347U (en) | 2020-10-26 | 2020-10-26 | System for evaporating desulfurization wastewater by utilizing waste heat in flue |
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