CN114988510B - Total heat recovery static sewage evaporation dryer - Google Patents
Total heat recovery static sewage evaporation dryer Download PDFInfo
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- CN114988510B CN114988510B CN202210721977.7A CN202210721977A CN114988510B CN 114988510 B CN114988510 B CN 114988510B CN 202210721977 A CN202210721977 A CN 202210721977A CN 114988510 B CN114988510 B CN 114988510B
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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
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/28—Evaporating with vapour compression
- B01D1/2887—The compressor is integrated in the evaporation apparatus
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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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
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
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Abstract
The invention discloses a total heat recovery static sewage evaporation dryer, and relates to the field of energy-saving sewage treatment equipment. The invention comprises a vacuum box and a vacuum type vapor compressor, wherein the air suction end of the vacuum type vapor compressor is communicated with the vacuum box, a phase-change heat collection cavity heat pipe set is arranged in the vacuum box, the heating end of the phase-change heat collection cavity heat pipe set is communicated with the air exhaust end of the vacuum type vapor compressor, the heating end of the phase-change heat collection cavity heat pipe set is simultaneously communicated with a condensate water discharge pipe extending out of the vacuum box, the top surface of the phase-change heat collection cavity heat pipe set is connected with a lifting section of a lifting motor arranged on the outer top surface of the vacuum box, the heat conduction end of the phase-change heat collection cavity heat pipe set is always attached to the sewage water surface, and the operation heating steam of the phase-change heat collection cavity heat pipe set is provided by the vacuum type vapor compressor; so as to solve the problems that the existing evaporation crystallization equipment can not be completely dried, is easy to scale and corrode and has higher energy consumption.
Description
Technical Field
The invention relates to the field of energy-saving sewage treatment equipment, in particular to a total heat recovery static sewage evaporation dryer.
Background
The sewage is a necessary product in the process of human production and life, and comprises various difficult and complicated sewage and various domestic sewage discharged by various industrial industries, wherein the annual industrial sewage discharge of China reaches more than 200 hundred million tons, the urban domestic sewage reaches more than 5 hundred million tons, and various solid pollutants and volatile pollutants are contained in the sewage.
The high-salt or heavy metal and messy solid waste water which is difficult to treat generally needs to be subjected to solid-liquid separation in an evaporation mode, however, the evaporation of water needs to consume a large amount of energy, even though the evaporation of the water is a common 3-5-effect evaporator which is an already adopted energy-saving measure, the water vapor consumption of evaporating 1 ton of water also reaches 0.4-0.5 ton of steam, if the natural gas boiler is used for burning steam, even if the cost of evaporating one ton of water is about 350 yuan according to 4 yuan/square natural gas, the cost of evaporating one ton of water of a traditional energy-saving multi-effect evaporator or MVR system is also above 150 yuan, even if the cost of adopting power plants or other waste heat steam to purchase about 200 yuan is also about 200 yuan, the cost of evaporating one ton of water of the traditional energy-saving multi-effect evaporator is above 100 yuan, and although the difficult solid pollutants in sewage can be well separated, the energy consumption of the traditional multi-effect evaporator is huge, compared with the conventional biochemical treatment mode, the cost of about 10 yuan/ton of treatment is about 10 times, so that the multi-effect evaporator only has more crystallization treatment on part of industrial sewage and is used in terms of crystallization treatment or only after reverse osmosis treatment.
In recent years, in order to reduce energy consumption, an MVR system in which most of the distilled secondary steam can be recovered is newly developed, the MVR system only consumes about 50kWh of equipment power consumption for evaporating one ton of water, consumes a small amount of starting fresh steam, and generally needs about 0.1 ton of starting steam for evaporating one ton of water. Therefore, the traditional MVR system saves about 50% of energy compared with a multi-effect evaporator. However, no matter the multi-effect evaporator or the MVR system adopts a falling film evaporation system with a heat exchanger circulation, the solution is always in a forced circulation heat exchange evaporation state of a pump, and when the solid content in the solution is increased to about 30% from a few thousandths, the normal operation of the system is influenced by factors such as scale formation crystallization, so that the discharge concentration of the solution of the traditional multi-effect evaporator and MVR system is basically not more than 30%, and the water or other solvents in the solution still more than 70% are thoroughly distilled off, and further, a subsequent high-energy-consumption drying device is required for deep treatment.
It can be seen that a large amount of concentrated problematic sewage or sludge (with a water content of about 70%) can be produced no matter what kind of treatment mode is adopted for treating sewage by using a reverse osmosis treatment, a multi-effect evaporator or an MVR evaporation device, and at present, the treatment cost of the sewage and sludge is very high, so that enterprises generally entrust treatment for the sewage and sludge, the cost of the problematic sewage and sludge is generally up to 500-1000 yuan, and the treatment cost is a heavy cost for most enterprises. Therefore, the current research hot spot is how to reduce the difficult sewage greatly at low cost and reduce the cost of external commission treatment greatly.
It can be seen that the conventional multiple effect evaporator system suffers from the following drawbacks:
1. the external energy input is needed, the energy consumption is high, and the cost is generally more than 100 yuan/ton (the steam cost is 200 yuan/ton);
2. the sewage can not be completely dried, the water content is up to 70% in general discharge, and high-cost treatment is needed in the follow-up process, and the general treatment cost is up to 500-1000 yuan/ton;
3. because of various solid matters contained in the sewage, the system solution is dynamically evaporated, all parts and pipelines of the whole system are easy to scale and corrode, and the equipment maintenance cost is high;
4. the corrosion of the system is more serious due to the higher steam temperature;
5. the former several effects of steam have higher temperature and cannot be used for distilling some heat-sensitive media, such as certain medicine additives, the temperature is too high to be denatured or volatilized, even if the evaporation under vacuum can be ensured by additionally installing a vacuum pump, the operation of the vacuum pump increases the energy consumption to increase the failure rate of the system, and the solution contacted by the heat exchange tube at a high temperature is easily denatured or volatilized.
6. Since the evaporated solution must be dynamically circulated through the pump, besides the risks of easy scaling and blocking, the performance of part of the solid materials may be affected, so that the product quality and quantity of the solid materials recovered from the sewage (part of the materials are adhered to various components and pipelines of the system), for example, the solid-liquid separation of part of medicines and fine chemicals, and the continuous dynamic circulation collision friction will definitely reduce the quality and quantity of the solid products.
7. Because the system must design the components such as the circulating pump and the heat exchanger of the system according to the specific sewage type or solution type, the equipment cannot be generally used basically, for example, a multi-effect evaporator for evaporating concentrated brine is not necessarily used for evaporating landfill leachate, all the equipment is nonstandard, and the equipment cannot be standardized, so that the initial investment is increased and the equipment cannot be popularized on a large scale.
Conventional MVR evaporation systems suffer from the following drawbacks:
1. a small amount of external energy is required to be input and started, the energy consumption is high, the Roots compressor or the centrifugal compressor is adopted to pressurize and heat the recycled secondary steam, and the cost is generally over 50 yuan/ton (the electricity charge is 0.6 yuan/kWh);
2. the sewage cannot be dried to completely distill off water, the water content is generally discharged to be up to 70%, and the subsequent treatment is also required to be carried out at high cost, and the general treatment cost is up to 500-1000 yuan/ton;
3. because the solid matters contained in the sewage are various, the system solution is dynamically evaporated, all parts and pipelines of the whole system are easy to scale and corrode, and the equipment maintenance cost is high;
4. as the compression temperature rise of the centrifugal type vapor compressor is not more than 10 ℃ and the compression temperature rise of the Roots type vapor compressor is not more than 20 ℃, the running temperature of the general MVR system is more than 80 ℃, and if the running temperature is less than 80 ℃, a vacuum pump is required to be additionally arranged to maintain the vacuum in the system, so that the running energy consumption and the complexity degree of the system are increased;
5. since the evaporated solution must be dynamically circulated through the pump, besides the risks of easy scaling and blocking, the performance of part of the solid materials may be affected, so that the product quality and quantity of the solid materials recovered from the sewage (part of the materials are adhered to various components and pipelines of the system), for example, the solid-liquid separation of part of medicines and fine chemicals, and the continuous dynamic circulation collision friction will definitely reduce the quality and quantity of the solid products.
6. Because the system must design the components such as the circulating pump and the heat exchanger of the system according to the specific sewage type or solution type, the equipment cannot be generally used basically, for example, an MVR evaporator designed for evaporating concentrated brine cannot be used for evaporating landfill leachate, which causes all the equipment to be nonstandard, cannot be produced in a standardized way, and also causes the increase of initial investment and cannot be popularized on a large scale.
Disclosure of Invention
The invention aims to provide a total heat recovery static sewage evaporation dryer so as to solve the problems that the existing evaporation crystallization equipment cannot be completely dried, is easy to scale and corrode and has high energy consumption.
In order to solve the problems, the invention adopts the following technical means:
the utility model provides a total heat recovery static sewage evaporation dryer, includes vacuum box, vacuum type vapor compressor's the end intercommunication of breathing in the vacuum box, be provided with phase transition heat collection chamber heat pipe group in the vacuum box, phase transition heat collection chamber heat pipe group's heating end with vacuum type vapor compressor's exhaust end intercommunication, phase transition heat collection chamber heat pipe group's heating end intercommunication has the extension vacuum box's comdenstion water discharge pipe simultaneously, phase transition heat collection chamber heat pipe group's top surface is connected with the elevating motor's of installing vacuum box top surface lifting section, phase transition heat collection chamber heat pipe group's heat conduction end is laminated with the sewage surface of water all the time, just phase transition heat collection chamber heat pipe group's operation heating steam only by vacuum type vapor compressor provides.
Preferably, a solution container for containing solution is arranged in the vacuum box, a sewage supplementing pipe is further communicated with the vacuum box, and a liquid outlet end of the sewage supplementing pipe is communicated with the solution container.
Further, the phase-change heat collection cavity heat pipe group comprises a phase-change heat collection box communicated with the exhaust end of the vacuum type vapor compressor, the top surface of the phase-change heat collection box is connected with the lifting section of the lifting motor, a heat conduction pipe is arranged in the phase-change heat collection box, the heat conduction pipe extends downwards to extend out of the phase-change heat collection box, and the bottom end of the heat conduction pipe is used as the heat conduction end.
Furthermore, the phase-change heat collection box is provided with a steam passing channel which penetrates up and down.
Further, a filter screen is arranged in the vacuum box, and covers the suction end of the vacuum type steam compressor and the communication port of the vacuum box.
Still further, the condensate drain communicates with a condensate storage tank, the top surface of the condensate storage tank communicates with an exhaust system, a purification device is disposed in the condensate storage tank, and the condensate storage tank also communicates with the cooling system of the vacuum vapor compressor through a compressor liquid injection pump.
Further, the exhaust system includes an exhaust pipe in communication with the top of the condensate storage tank, the exhaust pipe being provided with a gas discharge valve, an exhaust purification device, and an exhaust backup vacuum pump from the bottom to the top.
Still further, be provided with in the vacuum box respectively with the level sensor and the water content sensor of sewage contact, level sensor with water content sensor and control detection terminal signal communication, control monitoring terminal's control signal output with elevator motor's signal communication.
The invention has the following beneficial effects in the using process:
1. external steam is not required to be additionally input to start equipment or maintain equipment to run, only the vacuum type steam compressor and auxiliary equipment thereof need to consume electricity in the whole evaporation drying process, and because the surface solution is accurately heated through the heat conduction pipe to generate surface local boiling evaporation, the heat transfer is accurate and efficient, the energy consumption required for evaporating and drying 1 ton of water is between 20 and 50kWh, the energy consumption is more than 90 percent of the traditional multi-effect evaporation system plus the comprehensive energy conservation of the subsequent traditional drying, and the energy consumption is more than 80 percent of the traditional MVR evaporation system plus the comprehensive energy conservation of the subsequent traditional drying.
2. The integrated evaporation concentration and drying can evaporate and concentrate the water content of the sewage from more than 95% to the water content approaching zero, thoroughly dry various solid solutes in the sewage completely, and can directly outsource a small amount of solid substances without any subsequent decrement treatment or outsource treatment measures, or recycle useful substances, thereby greatly reducing the complexity and operation maintenance cost of the sewage whole-flow treatment system, and a large amount of condensed water can be recycled to achieve zero discharge of sewage treatment.
3. The invention can adopt an independent solution container to contain sewage, the sewage is placed in a vacuum box, the surface of the solution is precisely heated through the heat transfer superconducting pipe fitting to generate surface local boiling static evaporation, the solution does not need to circulate and any mechanical circulation equipment, and the solution is not contacted with any part of an evaporation drying system and any pipeline except for the heat pipe which is used for corrosion prevention and scaling prevention, so that the equipment is completely free from various corrosion or scaling, the operation reliability of the equipment is greatly improved, and the operation maintenance management cost is greatly reduced. A step of
4. The equipment can be used universally and can be standardized to facilitate the large-scale popularization of cost reduction, because the solution container arranged in the evaporation drying vacuum box is completely independent, the heat pipe group vacuum type steam unit and the box body are all universal, the solution container can be taken out of the vacuum box freely, the solution container can be used for evaporation drying of water solution, for example, seawater can be filled in the container, seawater can be evaporated and dried, garbage percolate can be evaporated and dried in the container, and electroplating waste liquid or other industrial sewage and wastewater can be evaporated and dried to corresponding sewage; only that individual container needs to be changed to a container of a different material according to the kind of solution.
5. The pressure ratio of the single-screw type compressed steam adopted by the vacuum type steam compressor can reach more than 5 and is far more than that of a conventional Roots type steam compressor or a centrifugal type compressor, so that the vacuum type steam compressor can play a role of a vacuum pump when the equipment is just started, the vacuum degree is pumped to a low vacuum degree which can be evaporated when the vacuum degree is 20-60 ℃, and the compression temperature rise of the vacuum type steam compressor on secondary steam can reach 50 ℃ and far more than that of the 18 ℃ of the conventional MVR Roots type compressor and 9 ℃ of the centrifugal type compressor, so that the normal operation temperature can be controlled and stabilized at the required low temperature state of 50-80 ℃, and certain heat sensitive substances such as vitamins can be evaporated and dried without additionally installing the operation vacuum pump, the system is greatly simplified, and the operation energy consumption and the system failure rate are reduced.
6. Because the evaporated solution is always in a static state, besides the advantages of high efficiency, high speed and energy saving of evaporation, the system also has no risks of scaling, blocking and the like, and the product quality and quantity of the solid materials recovered from the sewage are not influenced by the influence of severe collision friction on the performance of the solid materials (the solid materials are all in independent containers after being dried, and can be independently recovered and treated without any loss and leakage).
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a schematic diagram of a front view structure of a heat pipe set of the phase-change heat collection cavity of the invention.
Fig. 3 is a schematic top view of a heat pipe set of the phase-change heat collection cavity of the present invention.
FIG. 4 is a schematic diagram of a heat pipe set cross-sectional structure of a phase-change heat collection chamber according to the present invention.
The device comprises a 1-vacuum box, a 2-vacuum type vapor compressor, a 3-phase change heat collection cavity heat pipe group, a 31-phase change heat collection box, a 32-heat conduction pipe, a 33-steam passing channel, a 4-condensate water discharge pipe, a 5-lifting motor, a 6-solution container, a 7-sewage supplementing pipe, an 8-filter screen, a 9-condensate water storage box, a 10-purifying device, an 11-compressor liquid injection pump, a 12-exhaust pipe, a 13-gas discharge valve, a 14-exhaust purifying device and a 15-exhaust standby vacuum pump. .
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, or are directions or positional relationships conventionally understood by those skilled in the art, are merely for convenience of describing the present invention and for simplifying the description, and are not to indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Please refer to fig. 1, a total heat recovery static sewage evaporation dryer includes a vacuum box 1 and a vacuum type vapor compressor 2, wherein an air suction end of the vacuum type vapor compressor 2 is communicated with the vacuum box 1, a phase-change heat collection cavity heat pipe group 3 is arranged in the vacuum box 1, a heating end of the phase-change heat collection cavity heat pipe group 3 is communicated with an air exhaust end of the vacuum type vapor compressor 2, a condensed water discharge pipe 4 extending out of the vacuum box 1 is simultaneously communicated with the heating end of the phase-change heat collection cavity heat pipe group 3, a top surface of the phase-change heat collection cavity heat pipe group 3 is connected with a lifting section of a lifting motor 5 arranged on an outer top surface of the vacuum box 1, a heat conduction end of the phase-change heat collection cavity heat pipe group 3 is always attached to a sewage water surface, and operation heating steam of the phase-change heat collection cavity heat pipe group 3 is provided by the vacuum type vapor compressor 2 only.
In this way, in the using process, the mixed liquid to be dried and evaporated is placed in the vacuum box 1, in the starting process, the vacuum type vapor compressor 2 is started, in the operation process of the vacuum type vapor compressor 2, the original gas in the vacuum box 1 is pumped out, the vacuum state is formed in the vacuum box 1, and when the original gas is pumped out, the original gas is heated under the action of the vacuum type vapor compressor 2 after passing through the vacuum type vapor compressor 2 and is blown into the phase-change heat collection cavity heat pipe group 3, the heat conducting end of the phase-change heat collection pipe is heated, and the heat is conducted through the heat conducting section to heat sewage in the vacuum box 1, so that the evaporation of water in the sewage is accelerated by utilizing the conditions of low pressure and low sewage boiling point in the vacuum box 1. And then in the evaporation and drying process, the solution in the sewage is continuously evaporated to form solution steam, and the solution steam is heated by a vacuum compressor unit to serve as the only heat source of the phase-change heat collecting tube to heat the phase-change heat collecting tube. Meanwhile, the heat conduction end of the phase-change heat collection tube is always attached to the water surface of sewage, so that the energy required by separating water molecules (solvent molecules) on the surface of the solution from the solution is minimum, and therefore the water is evaporated efficiently in the whole evaporation drying process, and the heat generated by the vacuum compressor unit can be utilized to continuously dry the sewage.
Meanwhile, for the whole evaporation process, the application adopts the surface boiling static evaporation technology, namely the phase-change heat collecting tube is always in contact with the surface of sewage, the evaporation of sewage solution is carried out until the sewage solution is completely dried, the solution for evaporation in the whole evaporation process is always in a static state, and pump mechanical circulating equipment is not needed to circulate materials, thereby effectively avoiding the problem of scaling corrosion caused by the circulating transfer of sewage,
as the secondary steam (namely the steam generated in the vacuum box 1) can be used for heating the phase-change heat collection cavity heat pipe group 3 through total heat recovery, and the vacuum type steam compressor 2 with large compression ratio is adopted, the vacuum type steam compressor 2 can start vacuumizing evaporation from low temperature, no external steam is needed in the whole operation process from starting, the energy consumption can be reduced by about 20-50kWh when the evaporation and drying of 1 ton of water are carried out, the comprehensive energy consumption can be reduced by more than 50% compared with the traditional MVR evaporation system, and the energy consumption can be saved by more than 90% compared with the traditional multi-effect evaporation system.
Furthermore, a solution container 6 for containing sewage solution can be placed in the vacuum box 1, so that the convenience of placing sewage into the vacuum box 1 can be effectively improved, and the sewage is only contacted with the corrosion-resistant solution container 6 and the heat conduction end of the phase-change heat collection cavity heat pipe group 3 and is not contacted with other pipeline components of the evaporation drying system, so that the equipment is completely free from various pipeline corrosion or pipeline scaling, the operation reliability of the equipment is greatly improved, and the operation maintenance management cost is greatly reduced.
The solution container 6 can be freely taken out of the vacuum box 1, and the solution container 6 can be used for evaporating and drying any water solution, for example, seawater can be filled in the container, the seawater can be evaporated and dried, the landfill leachate can be evaporated and dried in the container, and the electroplating waste liquid or other industrial sewage can be evaporated and dried to obtain corresponding sewage; the solution container 6 is only required to be changed into different materials according to the types of the solutions.
Simultaneously, utilize sewage to supply pipe 7, can supply the material in the solution container 6 simultaneously to when supplying the material, need not open whole vacuum box 1, avoid the charging process to cause vacuum in the vacuum box 1 to reduce by a wide margin, and influence availability factor.
Specifically, as shown in fig. 2 to 4, the aforesaid heat pipe group 3 of the phase-change heat collecting chamber includes a phase-change heat collecting box 31 connected to the exhaust end of the vacuum type vapor compressor 2, the phase-change heat collecting box 31 is configured to receive the heating steam from the vacuum type vapor compressor 2, the top surface of the phase-change heat collecting box 31 is connected to the lifting section of the lifting motor 5, so that the lifting section of the lifting motor 5 is utilized to lift the heat conducting end of the heat pipe group 3 of the phase-change heat collecting chamber to move up and down along with the liquid surface in the solution container 6, a heat conducting pipe 32 is disposed in the aforesaid phase-change heat collecting box 31, the heat conducting pipe 32 extends downward to extend out of the phase-change heat collecting box 31, and the part of the heat conducting pipe 32 disposed in the phase-change heat collecting box 31 contacts with the heat steam input into the phase-change heat collecting box 31 of the vacuum type vapor compressor 2 to be heated, and the bottom end of the aforesaid heat conducting pipe 32 is used as the heat conducting end.
In addition, in order to enable the vapor generated in the solution container 6 to flow upward more effectively, the phase change heat collection tank 31 is provided with a vapor passage 33 penetrating up and down.
A filter screen 8 is provided in the vacuum box 1, and the filter screen 8 covers a communication port between the suction end of the vacuum vapor compressor 2 and the vacuum box 1.
Further, the condensed water drain pipe 4 is communicated with a condensed water storage tank 9, the top surface of the condensed water storage tank 9 is communicated with an exhaust system, a purifying device 10 is arranged in the condensed water storage tank 9, and the condensed water storage tank 9 is also communicated with a cooling system of the vacuum type vapor compressor 2 through a compressor spray pump 11.
In this way, condensed water which is changed into clean water after the water vapor is changed into phase in the phase change header of the phase change heat collection cavity heat pipe group 3 is discharged into the condensed water storage tank 9 through the condensed water discharge pipe 4, and part of condensed water in the condensed water storage tank 9 is sent to the vacuum type vapor compressor 2 through the compressor liquid spraying pump 11 to cool and lubricate the compressor in operation.
In addition, the exhaust system includes an exhaust pipe 12 communicating with the top surface of the condensate storage tank 9, the exhaust pipe 12 being provided with a gas discharge valve 13, an exhaust purification device 14, and an exhaust backup vacuum pump 15 from the bottom to the top.
Meanwhile, a liquid level sensor and a water content sensor which are respectively in contact with the sewage are arranged in the vacuum box 1, the liquid level sensor and the water content sensor are in signal communication with a control detection terminal, and a control signal output end of the control detection terminal is in signal communication with the lifting motor 5.
Like this, when the liquid level in solution container 6 along with the evaporation of surface boiling, the liquid level can slowly reduce, at this moment elevator motor 5 can let the phase change heat collection chamber heat pipe group 3 reciprocate according to the signal of the level sensor in vacuum chamber 1 and guarantee that the heat pipe 32 of phase change heat collection chamber heat pipe group 3 is 20cm in the liquid level top layer all the time, guarantee accurate high-efficient surface heating, along with the concentration of remaining solution is higher and lower the moisture content more and more, when the signal that water content sensor received shows that the moisture of solution has evaporated about 50% is in semi-dry state, the phase change heat collection chamber heat pipe group 3 stops moving fixed position heating until thoroughly stoving solution. The position of the phase-change heat collection cavity heat pipe group 3 is controlled by controlling the liquid level and the water content of the solution collected by the detection terminal in the whole operation process, so that the materials in the solution container 6 can be heated at high efficiency all the time.
In addition, the present invention can also provide two other practical embodiments:
use example 1
Belonging to batch evaporation drying:
taking 1000 kg of landfill leachate (COD is 5000mg/L and ammonia nitrogen is 2000 mg/L) with the TDS of 15000PPM as an example for evaporation and drying, placing a plastic barrel filled with 1000 kg of landfill leachate into a vacuum box 1, taking the plastic barrel as a solution container 6, starting a vacuum type vapor compressor 2 to pump out air in the vacuum box 1, when the vacuum degree is pumped to the vacuum degree of 5-10kPa with the initial boiling temperature of about 20-50 ℃ of the landfill leachate, starting surface boiling of the landfill leachate in the solution container 6, sucking the generated steam by the vacuum type vapor compressor 2, compressing and heating to 50-100 ℃, sending saturated steam with the temperature of 50-100 ℃ into a phase change heat collection box 31 of a phase change heat collection cavity heat pipe group 3 through a pipeline for phase change heat release, transferring heat to the surface of the solution through a heat conduction pipe 32 for heating, supplementing the heat lost by the boiling of the solution surface, continuously evaporating water on the solution surface, pumping the water by the vacuum type vapor compressor 2, changing the phase of the water vapor in the phase-change heat collection tank 31 of the phase-change heat collection cavity heat pipe group 3 into clean condensed water, then discharging the clean condensed water into the condensed water storage tank 9, and conveying part of the condensed water in the condensed water storage tank 9 to the vacuum type vapor compressor 2 by the compressor liquid-injection pump 11 to cool and lubricate the running compressor, wherein a deep water purifying device is arranged in the condensed water storage tank 9 for treating trace residual volatile COD and ammonia nitrogen contained in the condensed water, and the redundant condensed water is discharged or recycled through zero pollution of a valve. The condensed water storage tank 9 is provided with a valve for discharging noncondensable gas, which is in turn connected by piping to an exhaust purification device 14 and an exhaust backup vacuum pump 15. The liquid level in the solution container 6 is gradually reduced along with the surface boiling evaporation, at this time, the lifting motor 5 can control the phase-change heat collection cavity heat pipe group 3 to move up and down according to the liquid level signal and the water content signal received by the control monitoring terminal, so that the heat conduction pipe 32 of the phase-change heat collection cavity heat pipe group 3 is always 20cm on the surface layer of the liquid level, accurate and efficient surface heating is ensured, along with the higher concentration of the residual solution and the lower water content, when the water content of the solution is about 50% and is in a semi-dry state, the phase-change heat collection cavity heat pipe group 3 stops moving, the fixed position is heated until the solution is thoroughly dried, a plurality of steam passing channels 33 are arranged between the phase-change heat collection cavity heat pipe group 3 heat pipes, and the mesh-shaped pipelines which can be inserted into the semi-dry solution are arranged in the steam passing channels 33 so that the residual water in the semi-dry or basically full-dry state sewage is evaporated into water vapor and is absorbed by the vacuum type vapor compressor 2. The control monitoring terminal collects parameters such as the liquid level, temperature, water content, steam temperature, liquid level and temperature of the condensed water storage tank 9 and the like of the solution in the whole operation process, and controls the water supplementing time (when no water is just started) of the water supplementing device according to the position of the heat pipe group 3 of the phase-change heat collection cavity, the operation frequency and outlet steam temperature of the vacuum type steam compressor 2, the opening time of the gas discharging valve 13 and the opening time of the condensed water discharging valve, and the water level control water supplementing time (when no water is just started) of the condensed water storage tank 9.
Thus, various sewage with the solid content of about 1% can be continuously evaporated until the sewage is completely dried without any additional steam or other drying energy sources outside the system. And taking out the dried solid container, putting new sewage into the vacuum box 1, and repeating the same flow to dry.
Use of example 2
Belongs to continuous evaporation and drying:
taking 1000 kg of landfill leachate (COD is 5000mg/L and ammonia nitrogen is 2000 mg/L) with the TDS of 15000PPM as an example for evaporation and drying, placing a plastic barrel filled with 1000 kg of landfill leachate into a vacuum box 1, taking the plastic barrel as a solution container 6, starting a vacuum type vapor compressor 2 to pump out air in the vacuum box 1, when the vacuum degree is pumped to the vacuum degree of 5-10kPa with the initial boiling temperature of about 20-50 ℃ of the landfill leachate, starting surface boiling of the landfill leachate in the solution container 6, sucking the generated steam by the vacuum type vapor compressor 2, compressing and heating to 50-100 ℃, sending saturated steam with the temperature of 50-100 ℃ into a phase change heat collection box 31 of a phase change heat collection cavity heat pipe group 3 through a pipeline for phase change heat release, transferring heat to the surface of the solution through a heat conduction pipe 32 for heating, supplementing the heat lost by the boiling of the solution surface, continuously evaporating water on the solution surface, pumping the water by the vacuum type vapor compressor 2, changing the phase of the water vapor in the phase-change heat collection tank 31 of the phase-change heat collection cavity heat pipe group 3 into clean condensed water, then discharging the clean condensed water into the condensed water storage tank 9, and conveying part of the condensed water in the condensed water storage tank 9 to the vacuum type vapor compressor 2 by the compressor liquid-injection pump 11 to cool and lubricate the running compressor, wherein a deep water purifying device is arranged in the condensed water storage tank 9 for treating trace residual volatile COD and ammonia nitrogen contained in the condensed water, and the redundant condensed water is discharged or recycled through zero pollution of a valve. The condensed water storage tank 9 is provided with a valve for discharging noncondensable gas, which is in turn connected by piping to an exhaust purification device 14 and an exhaust backup vacuum pump 15. The liquid level in the solution container 6 is slowly reduced along with the surface boiling evaporation, at this time, sewage is added towards the solution container 6 through the sewage supplementing pipe 7, and then the ingress pipe is always positioned at a position 20cm below the liquid level, after the sewage is stopped to be added from the sewage supplementing pipe 7, and along with the liquid level in the solution container 6 descending, at this time, the lifting motor 5 can control the phase-change heat collecting cavity heat pipe group 3 to move up and down according to the liquid level signal and the water content signal received by the control monitoring terminal, so that the heat conducting pipe 32 of the phase-change heat collecting cavity heat pipe group 3 is always positioned at the surface layer of 20cm of the liquid level, and accurate and efficient surface heating is ensured, along with the higher and lower concentration of the residual solution, the phase-change heat collecting cavity heat pipe group 3 stops moving when the water content of the solution is evaporated to be about 50%, the fixed position is heated until the solution is thoroughly dried, a plurality of steam passing channels 33 are arranged between the phase-change heat collecting cavity heat pipe group 3, and the net-shaped pipeline which can be inserted into the solution is arranged in the channel 33 so that the residual evaporation in the semi-dry or basically dry state is the water vapor in the semi-dry state is completely evaporated into the water vapor compressor 2. The control monitoring terminal collects parameters such as the liquid level, temperature, water content, steam temperature, liquid level and temperature of the condensed water storage tank 9 and the like of the solution in the whole operation process, and controls the water supplementing time (when no water is just started) of the water supplementing device according to the position of the heat pipe group 3 of the phase-change heat collection cavity, the operation frequency and outlet steam temperature of the vacuum type steam compressor 2, the opening time of the gas discharging valve 13 and the opening time of the condensed water discharging valve, and the water level control water supplementing time (when no water is just started) of the condensed water storage tank 9.
Thus, various sewage with the solid content of about 1% can be continuously evaporated until the sewage is completely dried without any additional steam or other drying energy sources outside the system. And taking out the dried solid container, putting new sewage into the vacuum box 1, and repeating the same flow to dry.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (9)
1. A total heat recovery static sewage evaporation dryer is characterized in that: including vacuum chamber (1), vacuum vapor compressor (2)'s the end intercommunication of breathing in vacuum chamber (1), be provided with phase transition heat collection chamber heat pipe group (3) in vacuum chamber (1), the heating end of phase transition heat collection chamber heat pipe group (3) with vacuum vapor compressor (2)'s exhaust end intercommunication, the heating end of phase transition heat collection chamber heat pipe group (3) communicates simultaneously has and stretches out condensate water discharge pipe (4) of vacuum chamber (1), the top surface of phase transition heat collection chamber heat pipe group (3) is connected with the lift section of installing elevator motor (5) of vacuum chamber (1) outer top surface, the heat conduction end of phase transition heat collection chamber heat pipe group (3) is laminated with the sewage surface of water all the time, just the operation heating steam of phase transition heat collection chamber heat pipe group (3) is only provided by vacuum vapor compressor (2).
2. A total heat recovery static waste water evaporation dryer as claimed in claim 1, wherein: the vacuum box (1) is internally provided with a solution container (6) for containing solution, the vacuum box (1) is also communicated with a sewage supplementing pipe (7), and the liquid outlet end of the sewage supplementing pipe (7) is communicated with the solution container (6).
3. A total heat recovery static waste water evaporation dryer as claimed in claim 1, wherein: the phase-change heat collection cavity heat pipe group (3) comprises a phase-change heat collection box (31) communicated with the exhaust end of the vacuum type vapor compressor (2), the top surface of the phase-change heat collection box (31) is connected with the lifting section of the lifting motor (5), a heat conduction pipe (32) is arranged in the phase-change heat collection box (31), the heat conduction pipe (32) extends downwards to extend out of the phase-change heat collection box (31), and the bottom end of the heat conduction pipe (32) serves as the heat conduction end.
4. A total heat recovery static waste water evaporation dryer as claimed in claim 3, wherein: the phase-change heat collection box (31) is provided with a steam passing channel (33) which penetrates up and down.
5. A total heat recovery static waste water evaporation dryer as claimed in claim 1, wherein: a filter screen (8) is arranged in the vacuum box (1), and the filter screen (8) covers the air suction end of the vacuum type steam compressor (2) and the communication port of the vacuum box (1).
6. A total heat recovery static waste water evaporation dryer as claimed in claim 1, wherein: the condensate water discharge pipe (4) is communicated with the condensate water storage tank (9), the top surface of the condensate water storage tank (9) is communicated with an exhaust system, a purification device (10) is arranged in the condensate water storage tank (9), and the condensate water storage tank (9) is also communicated with the cooling system of the vacuum type vapor compressor (2) through a compressor liquid spraying pump (11).
7. The total heat recovery static wastewater evaporation dryer according to claim 6, wherein: the exhaust system comprises an exhaust pipe (12) communicated with the top surface of the condensed water storage tank (9), and the exhaust pipe (12) is provided with a gas discharge valve (13), an exhaust purification device (14) and an exhaust standby vacuum pump (15) from bottom to top.
8. A total heat recovery static waste water evaporation dryer as claimed in claim 1, wherein: the sewage treatment device is characterized in that a liquid level sensor and a water content sensor which are respectively in contact with sewage are arranged in the vacuum box (1), the liquid level sensor and the water content sensor are in signal communication with a control detection terminal, and a control signal output end of the control detection terminal is in signal communication with the lifting motor (5).
9. A total heat recovery static waste water evaporation dryer as claimed in claim 1, wherein: the vacuum type steam compressor (2) is a single screw type steam compressor.
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| CN112856942A (en) * | 2021-01-22 | 2021-05-28 | 四川建源节能科技有限公司 | Energy-saving drying-machine |
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| JP2006000851A (en) * | 2005-08-09 | 2006-01-05 | Ebara Corp | Vacuum evaporation distillation apparatus |
| CN201344649Y (en) * | 2009-01-24 | 2009-11-11 | 张斌 | Novel double-loop circulation solar water heater |
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| CN209399660U (en) * | 2018-10-30 | 2019-09-17 | 湖北东漳实业有限公司 | A kind of novel type silkworm cocoon drying apparatus |
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