CN112225272A - Evaporating pot and evaporative crystallization equipment - Google Patents
Evaporating pot and evaporative crystallization equipment Download PDFInfo
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- CN112225272A CN112225272A CN202010943860.4A CN202010943860A CN112225272A CN 112225272 A CN112225272 A CN 112225272A CN 202010943860 A CN202010943860 A CN 202010943860A CN 112225272 A CN112225272 A CN 112225272A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses an evaporating pot and evaporative crystallization equipment. The evaporation tank is used for evaporating and treating garbage percolate or industrial wastewater and comprises a horizontal tank body, a heating jacket for heating liquid to be treated so as to evaporate and concentrate the liquid is arranged outside the side wall of the horizontal tank body, a coil assembly is arranged on the outer ring of the heating jacket, the input end of the coil assembly is used for inputting the liquid to be treated, the output end of the coil assembly is communicated to the inner cavity of the horizontal tank body, and the coil assembly and the horizontal tank body form a double-layer liquid evaporation channel on the inner layer and the outer layer of the heating jacket; the upper part of the horizontal tank body is provided with a steam outlet, the bottom of the horizontal tank body is provided with a material outlet for outputting the evaporated and concentrated material, and the inner cavity of the horizontal tank body is also provided with a stirring mechanism for stirring, scraping and pushing for discharging. Whole simple structure, structural reliability is high, and the installation is maintained simply, need not just can the efficient retrieve water with the help of other equipment, and the concentration multiple of sewage evaporation is high. Is suitable for the evaporation treatment of various high-concentration wastewater.
Description
Technical Field
The invention relates to the technical field of high-concentration wastewater treatment equipment, in particular to an evaporation tank. In addition, the invention also relates to evaporative crystallization equipment comprising the evaporation tank.
Background
The landfill leachate is typical high-concentration wastewater, has the characteristics of high pollution, high harm, difficult disposal and the like, contains various organic matters which are listed as key control lists of environmental protection departments at home and abroad, and the harmless treatment of the landfill leachate is an important subject of the global environmental protection field. In order to realize zero emission of the landfill leachate, evaporation treatment is gradually a better process of the landfill leachate, but the existing evaporation equipment has problems of different degrees in actual use, and how to better perform evaporation, improve the system efficiency and improve the efficiency is still needed to be perfected.
When being used for landfill leachate and industrial waste water's evaporation treatment at present, mainly have: MVR evaporation equipment, reation kettle evaporation equipment, film heating evaporation equipment.
Wherein, MVR evaporation equipment: because the boiling point rises during the evaporation of the sewage, the liquid phase temperature and the gas phase temperature of high-pressure secondary steam in the evaporation process are caused, and the current compression temperature rise of the steam compressor is limited, so that the heating temperature difference between the secondary steam in the heat exchanger and the evaporated liquid is also limited, the concentration multiple of the evaporation of the sewage is not high, and the recovery rate of water is about 85 percent generally. Other equipment cooperation is also needed to realize 'zero emission'.
Wherein, reation kettle evaporation equipment: the liquid flow is limited, the inner wall of the cylinder body is easy to scale or pollute, and the heat transfer of the wall surface is blocked, so that the heat exchange efficiency of the system is low, and the steam energy consumption is high; the equipment is vertically installed, the discharge flow is difficult to control, the evaporated slag liquid needs to be discharged once during actual evaporation, and then the material can be fed again, so that the effective working time is shortened, and the evaporation efficiency is lower; influenced by heat exchange efficiency, the same evaporation capacity needs larger (longer) equipment or more equipment, and the matched machine frame and plant are complex, inconvenient to install and high in cost.
Wherein, film heating evaporation equipment: compared with reaction kettle equipment, single equipment is larger (longer) and poorer in installation performance; in addition, because the equipment needs to be heated into a film shape, if the equipment is in trouble or the medium is changed, the film distribution is not uniform, even the film is broken and the dry heat is generated, so that the heat exchange efficiency is greatly reduced.
Disclosure of Invention
The invention provides an evaporation tank and evaporation crystallization equipment, and aims to solve the technical problems that the existing evaporation treatment equipment is low in heat exchange efficiency, needs to be added with equipment for recovering water, and is low in concentration multiple of sewage evaporation.
According to one aspect of the invention, an evaporation tank is provided for carrying out evaporation treatment on landfill leachate or industrial wastewater, and comprises a horizontal tank body, wherein a heating jacket for heating liquid to be treated so as to evaporate and concentrate the liquid is arranged outside the side wall of the horizontal tank body, a coil assembly is arranged outside the heating jacket, the input end of the coil assembly is used for inputting the liquid to be treated, the output end of the coil assembly is communicated to the inner cavity of the horizontal tank body, and the coil assembly and the horizontal tank body form a double-layer liquid evaporation channel on the inner layer and the outer layer of the heating jacket; the upper part of the horizontal tank body is provided with a steam outlet, the bottom of the horizontal tank body is provided with a material outlet for outputting the evaporated and concentrated material, and the inner cavity of the horizontal tank body is also provided with a stirring mechanism for stirring, scraping and pushing for discharging.
Further, the coil component adopts a circulating liquid spiral coil which is attached to the outside of the heating jacket in a spiral shape; or the coil assembly adopts a plurality of annular coil units which are arranged at intervals, and the adjacent annular coil units are communicated through branch pipes.
Further, the cross-sectional shape of the pipe body of the coil pipe assembly is one of a semi-circle shape, a semi-ellipse shape and a polygon shape.
Further, the output end of the coil pipe assembly is communicated to the inner cavity of the horizontal tank body through a nozzle, and the liquid to be treated is sprayed out of the inner cavity of the horizontal tank body at a high speed through the nozzle, so that the pressure of the liquid to be treated is instantaneously reduced and the liquid to be treated is sprayed out in a dispersed manner, and further the flash evaporation vaporization of the liquid to be treated in the inner cavity of the horizontal tank body is realized.
Furthermore, the output end and the steam outlet of the coil assembly are respectively arranged at two ends of the horizontal tank body, and the output end and the material outlet of the coil assembly are respectively arranged at two ends of the horizontal tank body, so that the process and time of heating and evaporating the liquid to be treated are prolonged.
Further, the stirring mechanism comprises a rotating shaft, a driving and rotating mechanism for driving the rotating shaft to rotate and stirring blades which are arranged on the rotating shaft and rotate along with the rotating shaft.
Further, the stirring blade is at least one of a long stirring blade which is radially arranged along the rotating shaft and extends to the position of the inner wall surface of the horizontal tank body, a short stirring blade which is radially arranged along the rotating shaft and extends to the peripheral position of the rotating shaft, and a spiral blade which spirally surrounds the rotating shaft and the outer edge of the maximum size is in contact with the inner wall surface of the horizontal tank body.
Furthermore, a filter screen for filtering the steam is arranged on the steam outlet.
According to another aspect of the invention, the evaporative crystallization equipment comprises the evaporation tank.
The material output port of the evaporating tank is communicated to the input end of the slag-liquid separator, the slag-liquid separator is communicated to the input end of the coil assembly of the evaporating tank through the liquid inlet and outlet system, the circulating pump is arranged on the liquid inlet and outlet system, and the liquid inlet and outlet system, the evaporating tank and the slag-liquid separator form a circulating processing system; the circulating pump provides conveying power, so that the liquid to be treated entering the liquid inlet and outlet system enters the evaporating pot for evaporation treatment, the evaporated material enters the slag-liquid separator for solid-liquid separation, the supernatant liquid formed by separation of the slag-liquid separator enters the liquid inlet and outlet system for circulation, and the concentrated liquid formed by separation of the slag-liquid separator is collected after being discharged through the slag-liquid outlet.
Further, business turn over liquid system includes pending liquid input tube and circulation conveyer pipe, and the sediment liquid separator communicates the input to the coil pipe subassembly of evaporating pot through the circulation conveyer pipe, and the circulating pump sets up on the circulation conveyer pipe, and pending liquid input tube communicates to be provided with the feed liquor valve on the circulation conveyer pipe and the pending liquid input tube.
Further, be equipped with the level gauge that is used for monitoring liquid level height in the evaporating pot, level gauge and feed liquor valve communicate respectively to be connected to controlling means, send signal to controlling means when the liquid level of level gauge monitoring is less than the predetermined height, open with the control feed liquor through controlling means control feed liquor valve, send signal to controlling means when the liquid level of level gauge monitoring is higher than the predetermined height, close with stopping the feed liquor through controlling means control feed liquor valve.
Further, be equipped with concentration detection appearance in the sediment liquid separator, be equipped with the bleeder valve on the sediment liquid discharge port of sediment liquid separator, concentration detection appearance and bleeder valve respectively communication connection to controlling means, send signal to controlling means when concentration detection appearance detects the concentrate in the sediment liquid separator and reaches predetermined concentration, open in order to arrange the material through controlling means control bleeder valve, send signal to controlling means when concentration detection appearance detects the concentrate in the sediment liquid separator and is less than predetermined concentration, close in order to stop the row material through controlling means control bleeder valve.
The invention has the following beneficial effects:
the evaporation tank adopts the horizontal tank body which is a horizontal structure main body, and has simple structure, high structural reliability and simpler installation and maintenance; the horizontal tank body is provided with a heating jacket, a coil assembly is arranged outside the heating jacket, a liquid to be treated is firstly input into the coil assembly, the heat dissipated outwards by the heating jacket while flowing in the coil assembly is used for heating and evaporating the liquid to be treated in the coil assembly, the liquid to be treated in the coil assembly is input into an inner cavity of the horizontal tank body and is further heated and evaporated by the heat dissipated inwards by the heating jacket, the coil assembly and the horizontal tank body form a double-layer liquid evaporation channel on the inner layer and the outer layer of the heating jacket, the heat dissipated by the heating jacket is fully utilized, the utilization rate of the heat is high, and the heat exchange efficiency is high; after the liquid to be treated is heated and evaporated by the double-layer liquid evaporation channel, the generated water vapor is discharged through the steam discharge port and is collected and utilized. Moisture in the periphery of the horizontal tank body and in the outside air is evaporated and collected by condensation in the heating jacket, and condensed water can be recovered for further utilization. After the liquid to be treated is heated and evaporated through the double-layer liquid evaporation channel, the concentration multiple of sewage evaporation is high; and the concentrated solution can be output through the material output port and then subjected to solid-liquid separation, and the liquid is input through the input end of the coil assembly again to be subjected to cyclic heating and evaporation, so that the concentration multiple of sewage evaporation is further increased. The stirring mechanism is arranged in the inner cavity of the horizontal tank body, so that the liquid to be treated flows more uniformly and rapidly along the radial direction and the circumferential direction of the horizontal tank body under the stirring of the stirring mechanism in the heating and evaporating process of the liquid to be treated, and is further uniformly heated and evaporated to form a concentrated solution; and simultaneously, under the stirring of the stirring mechanism, the accumulated scale deposited at the bottom of the inner cavity of the horizontal tank body is separated from the horizontal tank body and is discharged towards the material output port under the thrust action of the stirring mechanism. Whole simple structure, structural reliability is high, and the installation is maintained simply, need not just can the efficient retrieve water with the help of other equipment, and thermal utilization ratio is high, and the concentration multiple of sewage evaporation is high. Is suitable for the evaporation treatment of various high-concentration wastewater.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the structure of an evaporative crystallization apparatus according to a preferred embodiment of the present invention;
fig. 2 is a sectional view a-a of fig. 1.
Illustration of the drawings:
1. a horizontal tank body; 101. a steam outlet; 102. a filter screen; 2. a heating jacket; 3. a coil assembly; 4. a stirring mechanism; 401. a rotating shaft; 402. a drive mechanism; 403. a long stirring blade; 404. a short stirring blade; 405. a helical blade; 5. a nozzle; 6. a fluid inlet and outlet system; 601. a liquid to be treated input pipe; 602. a circulating delivery pipe; 603. a liquid inlet valve; 7. a circulation pump; 8. a residue-liquid separator; 801. a discharge valve; 9. a liquid level meter.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
FIG. 1 is a schematic view of the structure of an evaporative crystallization apparatus according to a preferred embodiment of the present invention; fig. 2 is a sectional view a-a of fig. 1.
As shown in fig. 1, the evaporation tank of the present embodiment is used for performing evaporation treatment on landfill leachate or industrial wastewater, and includes a horizontal tank body 1, a heating jacket 2 for heating a liquid to be treated to evaporate and concentrate the liquid is disposed outside a sidewall of the horizontal tank body 1, a coil assembly 3 is disposed outside the heating jacket 2, an input end of the coil assembly 3 is used for inputting the liquid to be treated, an output end of the coil assembly 3 is communicated to an inner cavity of the horizontal tank body 1, and the coil assembly 3 and the horizontal tank body 1 form a double-layer liquid evaporation channel of an inner layer and an outer layer of the heating jacket 2; the upper part of the horizontal tank body 1 is provided with a steam outlet 101, the bottom of the horizontal tank body 1 is provided with a material outlet for outputting the evaporated and concentrated material, and the inner cavity of the horizontal tank body 1 is also provided with a stirring mechanism 4 for stirring, scraping and pushing for discharging. The evaporation tank adopts the horizontal tank body 1 which is a horizontal structure main body, has simple structure and high structural reliability, and is simpler to install and maintain; the horizontal tank body 1 is externally provided with a heating jacket 2, the heating jacket 2 is externally provided with a coil assembly 3, a liquid to be treated is firstly input into the coil assembly 3, the heat dissipated outwards through the heating jacket 2 while flowing in the coil assembly 3 is used for heating and evaporating the liquid to be treated in the coil assembly 3, the liquid to be treated in the coil assembly 3 is input into an inner cavity of the horizontal tank body 1 again and is further heated and evaporated through the heat dissipated inwards through the heating jacket 2, the coil assembly 3 and the horizontal tank body 1 form a double-layer liquid evaporation channel on the inner layer and the outer layer of the heating jacket 2, the heat dissipated by the heating jacket 2 is fully utilized, the heat utilization rate is high, and the heat exchange efficiency is high; after the liquid to be treated is heated and evaporated through the double-layer liquid evaporation channel, the generated water vapor is discharged through the vapor discharge port 101 and collected and utilized. Moisture in the periphery of the horizontal tank body 1 and in the outside air entering the heating jacket 2 is evaporated and collected by condensation, and condensed water can be recovered for further utilization. After the liquid to be treated is heated and evaporated through the double-layer liquid evaporation channel, the concentration multiple of sewage evaporation is high; and the concentrated solution can be output through the material output port and then subjected to solid-liquid separation, and the liquid is input through the input end of the coil assembly 3 again to be subjected to cyclic heating and evaporation, so that the concentration multiple of sewage evaporation is further increased. The stirring mechanism 4 is arranged in the inner cavity of the horizontal tank body 1, so that in the process of heating and evaporating the liquid to be treated, the liquid to be treated flows more uniformly and rapidly along the radial direction and the circumferential direction of the horizontal tank body 1 under the stirring of the stirring mechanism 4, and is further uniformly heated and evaporated to form a concentrated solution; and simultaneously, under the stirring of the stirring mechanism 4, the accumulated scale deposited at the bottom of the inner cavity of the horizontal tank body 1 is separated from the horizontal tank body 1 and moves towards the material output port to be discharged under the thrust action of the stirring mechanism 4. Whole simple structure, structural reliability is high, and the installation is maintained simply, need not just can the efficient retrieve water with the help of other equipment, and thermal utilization ratio is high, and the concentration multiple of sewage evaporation is high. Is suitable for the evaporation treatment of various high-concentration wastewater. Alternatively, steam generated around the horizontal tank 1, external steam or steam generated by self-contained electric heating passes through the heating jacket 2, is condensed from the bottom of the other end of the heating jacket 2 and then is discharged, and is collected.
As shown in fig. 1 and 2, in the present embodiment, a circulating liquid spiral coil spirally attached to the outside of the heating jacket 2 is used as the coil unit 3. The circulating liquid spiral coil is made of a half-section pipeline and is welded on the outer side of the heating jacket, so that on one hand, the contact heat exchange area with the heating jacket is increased, on the other hand, the flow velocity and the heat exchange effect in the pipe can be improved by using a low-power circulating pump 7, and the liquid is prevented from being accumulated in the pipe wall. The half-section pipeline is a relative concept with respect to the regular-section pipeline, that is, the regular-section pipeline is divided into half and half to form the half-section pipeline, for example, a round pipe is divided into half and half to form a half-round pipe, and a square pipe is divided into half and half to form a groove-shaped pipe. Optionally, the coil assembly 3 adopts a plurality of annular coil units arranged at intervals, adjacent annular coil units are communicated through branch pipes, and the annular coil units are regular structural bodies, so that the annular coil units are convenient for batch processing and assembly connection.
As shown in fig. 1 and 2, in the present embodiment, the cross-sectional shape of the tube body of the coil assembly 3 is one of a semi-circle, a semi-ellipse, and a polygon. According to the parameters of the shape of the outer surface of the horizontal tank body 1, the shape of the outer surface of the heating jacket 2, the liquid flow requirement and the like, the section shape of the pipe body of the coil pipe component 3 is designed, and the requirements of equipment are further met.
As shown in fig. 1 and fig. 2, in this embodiment, the output end of the coil assembly 3 is communicated to the inner cavity of the horizontal tank 1 through the nozzle 5, and the liquid to be treated is ejected at a high speed to the inner cavity of the horizontal tank 1 through the nozzle 5, so that the pressure of the liquid to be treated is instantaneously reduced and the liquid to be treated is ejected dispersedly, thereby realizing flash evaporation vaporization of the liquid to be treated in the inner cavity of the horizontal tank 1, and greatly increasing the evaporation speed.
As shown in fig. 1 and fig. 2, in this embodiment, the output end and the steam outlet 101 of the coil assembly 3 are respectively located at two ends of the horizontal tank 1, and the output end and the material outlet of the coil assembly 3 are respectively located at two ends of the horizontal tank 1, so as to prolong the process and time of the evaporation of the liquid to be treated. The liquid to be treated enters the coil assembly 3 from the output end of the coil assembly 3 at the first end of the horizontal tank body 1 to flow spirally and be heated and evaporated, and is input into the inner cavity of the horizontal tank body 1 from the second end of the horizontal tank body 1, the liquid to be treated in the inner cavity of the horizontal tank body 1 flows from the second end to the first end and is stirred by the stirring mechanism 4 to flow spirally and be heated and evaporated, the whole process prolongs the heat exchange process of the liquid to be treated, the liquid to be treated fully exchanges heat with the heating jacket 2, and evaporation of the liquid and increase of concentration multiple of residual materials are realized.
As shown in fig. 1 and fig. 2, in the present embodiment, the stirring mechanism 4 includes a rotating shaft 401, a driving mechanism 402 for driving the rotating shaft 401 to rotate, and a stirring blade disposed on the rotating shaft 401 and rotating with the rotating shaft 401. The rotation speed of the stirring blade can be controlled by the driving mechanism 402, and the flow rate and flow rate of the liquid to be treated can be controlled, so that the liquid to be treated can be sufficiently heated, evaporated and concentrated.
As shown in fig. 1 and 2, in the present embodiment, the stirring blade is at least one of a long stirring blade 403 which is arranged along the radial direction of the rotating shaft 401 and extends to the position of the inner wall surface of the horizontal tank 1, a short stirring blade 404 which is arranged along the radial direction of the rotating shaft 401 and extends to the position of the periphery of the rotating shaft 401, and a helical blade 405 which is spirally wound around the rotating shaft 401 and has the maximum outer edge in contact with the inner wall surface of the horizontal tank 1. Optionally, the long stirring blade 403, the short stirring blade 404, and the helical blade 405 are respectively located in different radial directions and different axial positions of the rotating shaft 401, so as to form an inner, middle, and outer three-dimensional stirring system in the inner cavity space of the horizontal tank 1, so that the liquid to be treated in the inner cavity of the horizontal tank 1 is heated more uniformly and rapidly. Optionally, the helical blade 405 is arranged on the outer ring, and is in clearance fit or contact fit with the inner wall surface of the horizontal tank body 1, so as to play multiple roles of stirring, wall scraping and material pushing, so as to realize multiple functions of promoting the liquid to be treated to flow uniformly, removing the scale on the inner wall of the horizontal tank body 1, and pushing the material to move directionally. Optionally, the long stirring blade 403 and the short stirring blade 404 are respectively located in different radial directions and different axial positions of the rotating shaft 401, so as to form an inner, middle and outer three-dimensional stirring system in the inner cavity space of the horizontal tank 1, so that the liquid to be treated in the inner cavity of the horizontal tank 1 is heated more uniformly and rapidly. Optionally, the outward extending end of the long stirring blade 403 is in clearance fit or contact fit with the inner wall surface of the horizontal tank 1, and plays multiple roles of stirring and scraping walls, so as to realize multiple functions of promoting the liquid to be treated to flow uniformly and removing the scale on the inner wall of the horizontal tank 1. Alternatively, the free ends of the long stirring blades 403 and/or the short stirring blades 404 are twisted in the axial direction, thereby forming oblique blades,
as shown in fig. 1, in the present embodiment, a filter screen 102 for filtering steam is provided on the steam outlet 101. Optionally, the output end of the steam outlet 101 is arranged obliquely upwards, the steam is discharged after passing through the filter screen 102 and collected for use, and the filtered solid particles fall back into the inner cavity of the horizontal tank 1 by gravity. Optionally, a chemical spraying device for applying a biological deodorant or a chemical deodorant to the steam to be output is further provided on the steam outlet 101 to eliminate the odor of the steam to be output by evaporation. Optionally, the nozzle of the medicament injection device is located outside the filter screen 102 and injects along the flow direction of the steam to avoid the medicament from flowing back into the horizontal tank 1.
As shown in FIG. 1, the evaporative crystallization apparatus of the present embodiment includes the above-described evaporation tank.
As shown in fig. 1, in this embodiment, the system further includes a liquid inlet and outlet system 6, a circulation pump 7 and a slag-liquid separator 8, a material outlet of the evaporation tank is communicated to an input end of the slag-liquid separator 8, the slag-liquid separator 8 is communicated to an input end of the coil assembly 3 of the evaporation tank through the liquid inlet and outlet system 6, the circulation pump 7 is disposed on the liquid inlet and outlet system 6, and the liquid inlet and outlet system 6, the evaporation tank and the slag-liquid separator 8 form a circulation processing system. The circulating pump 7 provides conveying power, so that the liquid to be treated entering the liquid inlet and outlet system 6 enters the evaporating tank for evaporation treatment, the evaporated material enters the slag-liquid separator 8 for solid-liquid separation, the supernatant liquid separated by the slag-liquid separator 8 enters the liquid inlet and outlet system 6 for circulation, and the concentrated liquid separated by the slag-liquid separator 8 is discharged through the slag-liquid outlet and then collected. The liquid inlet and outlet system 6, the evaporating pot and the slag-liquid separator 8 form a liquid circulating flow system, so that the liquid to be treated is circularly evaporated, and the concentration multiple of the concentrated liquid separated from the slag-liquid separator 8 is increased.
As shown in fig. 1, in this embodiment, the liquid inlet and outlet system 6 includes a to-be-treated liquid input pipe 601 and a circulation delivery pipe 602, the slag-liquid separator 8 is communicated to the input end of the coil assembly 3 of the evaporation tank through the circulation delivery pipe 602, the circulation pump 7 is disposed on the circulation delivery pipe 602, the to-be-treated liquid input pipe 601 is communicated to the circulation delivery pipe 602, and the to-be-treated liquid input pipe 601 is provided with a liquid inlet valve 603. Because the heating and evaporation process of the liquid to be treated is a cyclic process, and the discharge process of the concentrated solution is an intermittent discharge process, when the concentrated solution reaches the mobile concentration, the liquid to be treated can be properly opened by the input pipe 601 so as to supplement the liquid to be treated into the liquid inlet and outlet system 6, the coil assembly 3 and the horizontal tank body 1; or when the liquid to be treated is lacked in the horizontal tank body 1, the liquid to be treated can be immediately supplemented into the horizontal tank body 1; the liquid to be treated can be supplemented at any time, a specific time does not need to be selected, the process does not need to wait until the previous batch of materials is completely treated, the use is more convenient, the treatment process can be continuously carried out, and the treatment efficiency and the treatment amount are further improved.
As shown in fig. 1, in the present embodiment, a liquid level meter 9 for monitoring a liquid level in the evaporation tank is disposed in the evaporation tank, and the liquid level meter 9 and the liquid inlet valve 603 are respectively connected to the control device in a communication manner. Optionally, the level gauge 9 and the inlet valve 603 are electrically connected to the control device, respectively. When the liquid level monitored by the liquid level meter 9 is lower than the preset height, a signal is sent to the control device, the liquid inlet valve 603 is controlled to be opened through the control device to control liquid inlet, when the liquid level monitored by the liquid level meter 9 is higher than the preset height, a signal is sent to the control device, and the liquid inlet valve 603 is controlled to be closed through the control device to stop liquid inlet.
As shown in fig. 1, in this embodiment, a concentration detector is disposed in the slag-liquid separator 8, a discharge valve 801 is disposed on a slag-liquid discharge port of the slag-liquid separator 8, and the concentration detector and the discharge valve 801 are respectively connected to a control device in a communication manner. Optionally, the concentration detector and the outlet valve 801 are electrically connected to the control device, respectively. When the concentration detector detects that the concentrated solution in the slag-liquid separator 8 reaches the preset concentration, a signal is sent to the control device, the discharge valve 801 is controlled to be opened through the control device to discharge materials, when the concentration detector detects that the concentrated solution in the slag-liquid separator 8 is lower than the preset concentration, a signal is sent to the control device, and the discharge valve 801 is controlled to be closed through the control device to stop discharging materials.
When in implementation, the multi-liquid-channel evaporative crystallization equipment comprises a liquid inlet and outlet system 6, a horizontal tank body 1, a stirring mechanism 4 and a control system. Wherein the liquid inlet and outlet system 6 comprises a slag-liquid separator 8, a circulating pump 7, a liquid inlet valve 603 and a discharge valve 801; the horizontal tank body 1 comprises a circulating liquid spiral coil (coil component 3), a heating jacket 2, a secondary steam outlet device (steam outlet 101), a liquid level meter 9 and a nozzle 5; the stirring mechanism 4 includes a driving mechanism 402, a helical blade 405, a long stirring blade 403, and a short stirring blade 404. The structural scheme is shown in figure 1.
When the equipment works, the liquid inlet valve 603 of the liquid to be treated is opened for feeding, and when the liquid level meter 9 in the horizontal tank body 1 reaches a set high liquid level, the liquid inlet valve 603 is closed; then, the stirring mechanism 4 is started to generate primary steam (external steam or steam generated by self-carried electric heating) or other heat carriers to heat and evaporate the liquid entering the horizontal tank body 1, and secondary steam generated by evaporation is discharged through a steam outlet device (a steam outlet 101) to be condensed or reused; the condensed water after the primary steam condensation is respectively discharged from the other end of the bottom of the horizontal tank body 1 for subsequent treatment or reuse. After the liquid level of the horizontal tank 1 is reduced to a set low liquid level by the evaporation of the liquid, the liquid inlet valve 603 is opened to feed the liquid, and the liquid is repeatedly heated and evaporated.
After the liquid is evaporated, the liquid is gradually concentrated in the horizontal tank body 1 and is pushed to the slag-liquid separator 8 through the helical blade 405, crystals at the bottom of the slag-liquid separator 8 are further thickened and settled, after the liquid is concentrated for a period of time (set time is determined according to a slag-liquid sampling test, or a concentration detection instrument is adopted for automatic monitoring), the discharge valve 801 is opened to discharge slag liquid (or is sucked and discharged by a pump), after the set discharge time is reached, the discharge valve is closed, and the discharge is stopped; the intermittent discharge is repeated in this way. The continuous heating and intermittent discharging of the system are ensured, and the working efficiency is higher.
For improving the heat exchange effect, the design of this scheme has circulation liquid spiral coil (coil pipe subassembly 3) and nozzle 5 in heating jacket 2 outside. The supernatant in the slag-liquid separator 8 is conveyed to the spiral coil (coil component 3) through the circulating pump 7 to absorb the heat in the heating jacket 2 for further temperature rise, and then is sprayed out at high speed through the nozzle 5, the liquid pressure drops instantly, the evaporation is carried out in the horizontal tank body 1 through flash evaporation, and the evaporation speed is greatly improved. The circulating liquid spiral coil (coil component 3) adopts a spiral coil made of a half-section pipeline, and is welded outside the heating jacket 2, so that on one hand, the contact heat exchange area of the circulating liquid spiral coil and the heating jacket 2 is increased, on the other hand, the flow velocity and the heat exchange effect in the pipe can be improved by using a low-power circulating pump 7, and the liquid is prevented from being accumulated on the pipe wall.
The stirring mechanism 4 is provided with a helical blade 405, a long stirring blade 403 and a short stirring blade 404 to form three-dimensional stirring inside and outside the cavity of the horizontal tank body 1, and the liquid in the horizontal tank body 1 is heated more uniformly and rapidly. Wherein, the helical blade 405 is arranged on the outer ring, has small distance with the inner wall of the cylinder body of the horizontal tank body 1, plays roles of stirring and scraping the wall, and cleans the possible scale deposit on the inner wall of the horizontal tank body 1; the long stirring blades 403 and the short stirring blades 404 are of conventional paddle type structures, stirring ranges with different radiuses are formed in the section of the cylinder, stirring is more uniform, and heat exchange efficiency is improved.
The multi-liquid-channel evaporation crystallization equipment has the technical effects that:
1. a horizontal heating structure is adopted, so that the system is simple and reliable, and the installation and maintenance are simple;
2. a circulating liquid spiral coil and a nozzle are designed, so that two liquid channels are formed inside and outside the heating jacket 2, the heating area of the unit volume of the heater is increased, the liquid can be heated again and form flash evaporation vaporization, and the heat exchange efficiency and the evaporation speed are greatly improved;
3. the helical blade 405, the long stirring blade 403 and the short stirring blade 404 are designed to form three-dimensional stirring inside, inside and outside, and the liquid in the cylinder is heated more uniformly and rapidly. And helical blade 405 arranges in the outer lane, has ejection of compact and wall scraping effect concurrently, not only can clear up the possible scaling of barrel inner wall in the stirring in-process, can also discharge the sediment liquid.
4. The design has the slag-liquid separator 8 and the circulating pump 7, the concentration multiple of the evaporated slag liquid is high, continuous intermittent discharge can be realized, the feeding is not required after the previous liquid is emptied (namely batch operation) like the conventional heating evaporation equipment, and the working efficiency of the system is greatly improved. The circulating pump 7 can make the supernatant in the slag-liquid separator 8 flow through the spiral coil (coil component 3) and the nozzle 5 at high speed, absorb heat and raise temperature, and evaporate in the horizontal tank 1 by flash evaporation, so that the evaporation speed is greatly improved. The design has a slag-liquid separator 8, so that the evaporated slag-liquid has high concentration multiple and can realize continuous intermittent discharge.
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 (13)
1. An evaporation tank for evaporating landfill leachate or industrial wastewater, which comprises a horizontal tank body (1),
it is characterized in that the preparation method is characterized in that,
a heating jacket (2) for heating the liquid to be treated so as to evaporate and concentrate the liquid is arranged outside the side wall of the horizontal tank body (1),
a coil assembly (3) is arranged on the outer ring of the heating jacket (2), the input end of the coil assembly (3) is used for inputting liquid to be treated, the output end of the coil assembly (3) is communicated to the inner cavity of the horizontal tank body (1), and the coil assembly (3) and the horizontal tank body (1) form a double-layer liquid evaporation channel on the inner layer and the outer layer of the heating jacket (2);
the steam discharging device is characterized in that a steam discharging port (101) is formed in the upper portion of the horizontal tank body (1), a material discharging port for discharging evaporated and concentrated materials is formed in the bottom of the horizontal tank body (1), and a stirring mechanism (4) for stirring, scraping and pushing discharging is further arranged in the inner cavity of the horizontal tank body (1).
2. An evaporation tank according to claim 1,
the coil component (3) adopts a circulating liquid spiral coil which is spirally attached to the outside of the heating jacket (2); or
The coil assembly (3) adopts a plurality of annular coil units which are arranged at intervals, and adjacent annular coil units are communicated through branch pipes.
3. An evaporation tank according to claim 2,
the section of the pipe body of the coil pipe component (3) is in one of a semi-circle shape, a semi-ellipse shape and a polygon shape.
4. An evaporation tank according to claim 1,
the output end of the coil pipe component (3) is communicated to the inner cavity of the horizontal tank body (1) through a nozzle (5),
and (3) spraying the liquid to be treated to the inner cavity of the horizontal tank body (1) at a high speed through the nozzle (5) so that the pressure of the liquid to be treated is instantaneously reduced and the liquid to be treated is sprayed out in a dispersed manner, thereby realizing the flash evaporation vaporization of the liquid to be treated in the inner cavity of the horizontal tank body (1).
5. An evaporation tank according to any of claims 1 to 4,
the output end of the coil assembly (3) and the steam outlet (101) are respectively arranged at two ends of the horizontal tank body (1), and the output end of the coil assembly (3) and the material outlet are respectively arranged at two ends of the horizontal tank body (1), so that the process and time of heating and evaporating the liquid to be treated are prolonged.
6. An evaporation tank according to any of claims 1 to 4,
the stirring mechanism (4) comprises a rotating shaft (401), a driving and rotating mechanism (402) used for driving the rotating shaft (401) to rotate and stirring blades arranged on the rotating shaft (401) and rotating along with the rotating shaft (401).
7. An evaporation tank according to claim 6,
the stirring blade adopts at least one of a long stirring blade (403) which is radially arranged along the rotating shaft (401) and extends to the position of the inner wall surface of the horizontal tank body (1), a short stirring blade (404) which is radially arranged along the rotating shaft (401) and extends to the peripheral position of the rotating shaft (401), and a spiral blade (405) which spirally surrounds the rotating shaft (401) and has the maximum size outer edge contacting with the inner wall surface of the horizontal tank body (1).
8. An evaporation tank according to any of claims 1 to 4,
and a filter screen (102) for filtering the steam is arranged on the steam outlet (101).
9. An evaporative crystallisation apparatus comprising an evaporative canister as claimed in any one of claims 1 to 8.
10. The evaporative crystallization apparatus of claim 9,
also comprises a liquid inlet and outlet system (6), a circulating pump (7) and a slag-liquid separator (8),
a material output port of the evaporating pot is communicated to an input end of a slag-liquid separator (8), the slag-liquid separator (8) is communicated to an input end of a coil assembly (3) of the evaporating pot through a liquid inlet and outlet system (6), a circulating pump (7) is arranged on the liquid inlet and outlet system (6), and the liquid inlet and outlet system (6), the evaporating pot and the slag-liquid separator (8) form a circulating processing system;
the circulating pump (7) provides conveying power, so that the liquid to be treated entering the liquid inlet and outlet system (6) enters the evaporating tank for evaporation treatment, the evaporated material enters the slag-liquid separator (8) for solid-liquid separation, the supernatant separated by the slag-liquid separator (8) enters the liquid inlet and outlet system (6) for circulation, and the concentrated solution separated by the slag-liquid separator (8) is discharged through the slag-liquid outlet and then collected.
11. The evaporative crystallization apparatus of claim 10,
the liquid inlet and outlet system (6) comprises a liquid input pipe (601) to be treated and a circulating conveying pipe (602),
the slag-liquid separator (8) is communicated with the input end of the coil pipe component (3) of the evaporating pot through a circulating conveying pipe (602), a circulating pump (7) is arranged on the circulating conveying pipe (602),
the liquid to be treated input pipe (601) is communicated to the circulating delivery pipe (602), and a liquid inlet valve (603) is arranged on the liquid to be treated input pipe (601).
12. The evaporative crystallization apparatus of claim 11,
a liquid level meter (9) for monitoring the liquid level height in the evaporation tank is arranged in the evaporation tank, the liquid level meter (9) and the liquid inlet valve (603) are respectively communicated and connected to the control device,
when the liquid level monitored by the liquid level meter (9) is lower than the preset height, a signal is sent to the control device, the liquid inlet valve (603) is controlled to be opened by the control device to control the liquid inlet,
when the liquid level monitored by the liquid level meter (9) is higher than a preset height, a signal is sent to the control device, and the liquid inlet valve (603) is controlled to be closed by the control device to stop feeding liquid.
13. The evaporative crystallization apparatus of any one of claims 10 to 12,
a concentration detector is arranged in the slag-liquid separator (8), a discharge valve (801) is arranged on a slag-liquid outlet of the slag-liquid separator (8), the concentration detector and the discharge valve (801) are respectively connected to a control device in a communication way,
when the concentration detector detects that the concentrated solution in the slag-liquid separator (8) reaches the preset concentration, a signal is sent to the control device, the control device controls the discharge valve (801) to be opened for discharging,
when the concentration detector detects that the concentrated solution in the slag-liquid separator (8) is lower than the preset concentration, a signal is sent to the control device, and the discharge valve (801) is controlled to be closed by the control device to stop discharging.
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| CN115420092A (en) * | 2022-09-29 | 2022-12-02 | 上海同迅环保科技有限公司 | Air heat energy stirrer |
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Effective date of registration: 20220124 Address after: No. 288, Linyu Road, high tech Development Zone, Changsha, Hunan Province, 410205 Applicant after: ZOOMLION ENVIRONMENTAL INDUSTRY Co.,Ltd. Applicant after: Changsha Zhongfeng Environmental Protection Technology Co.,Ltd. Address before: No. 288, Linyu Road, high tech Development Zone, Changsha, Hunan Province, 410205 Applicant before: ZOOMLION ENVIRONMENTAL INDUSTRY Co.,Ltd. |
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