CN111717949A - Low-temperature multi-effect evaporation sewage concentration device and process of finned heat pipe - Google Patents
Low-temperature multi-effect evaporation sewage concentration device and process of finned heat pipe Download PDFInfo
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- CN111717949A CN111717949A CN202010726789.4A CN202010726789A CN111717949A CN 111717949 A CN111717949 A CN 111717949A CN 202010726789 A CN202010726789 A CN 202010726789A CN 111717949 A CN111717949 A CN 111717949A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/02—Evaporators with heating coils
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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Abstract
The invention discloses a fin heat pipe low-temperature multi-effect evaporation sewage concentration device and a process thereof, wherein the device comprises at least two stages of series-connected concentration evaporation systems, a first heat exchange chamber, a second heat exchange chamber and a heat pipe, wherein the heat pipe comprises a heat pipe condensation end at the upper part and a heat pipe evaporation end at the lower part; the medium temperature fan and the heat pipe condensation end are sequentially arranged in the second heat exchange cavity from the medium temperature dry air inlet end according to the flowing direction of medium temperature circulating air, and the second heat exchange cavity air outlet, the medium temperature evaporator air inlet, the medium temperature evaporator air outlet, the medium temperature condenser air inlet, the medium temperature condenser air outlet and the second heat exchange cavity air inlet are sequentially connected through pipelines. The device has low energy consumption, low investment cost and popularization.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a fin heat pipe low-temperature multi-effect evaporation sewage concentration device and a process thereof.
Background
The existing wastewater treatment technologies have corresponding characteristics, evaporation concentration is commonly adopted for sewage which is difficult to treat at present, an electric/gas/coal boiler evaporation device is commonly adopted at home and abroad, and due to high operation temperature, high steam pressure and high requirements on corrosion resistance and pressure resistance of equipment materials, pressure-resistant operation is required, and pressure-bearing equipment is expensive; the coal boiler evaporation concentration device is basically eliminated or eliminated due to serious environmental pollution; the evaporation and concentration device of the gas heating boiler is not applied much at present due to the safety and the economical efficiency. Due to convenience and environmental concerns, electric heating concentration devices are currently in increasing use. The energy consumption of the single-stage electric boiler is very high, even if multi-stage evaporation is adopted, the energy consumption per ton of water of the evaporation and concentration device of the electric boiler is still about 200-300kwh, the equipment investment of the evaporation and concentration device of the electric boiler is high, and the energy consumption is still high. For an MVR vapor compression evaporation concentration system, the equipment requirement is high, the technological process is complex, and especially, the MVR vapor compressor is expensive, and the system investment cost is very high and is almost 3 times of that of boiler evaporation concentration equipment. For a heat pump low-temperature vacuum evaporation concentration system, the energy consumption per ton of water is still as high as 200kwh, and the process has vacuum pressure-bearing equipment, so that the equipment is expensive and the investment cost is high. The sewage is evaporated, dehumidified and concentrated by adopting the heat pump, the sewage can be evaporated and concentrated at low temperature and normal pressure, the equipment requirement is low, the investment is low, and the energy consumption can be reduced due to the 3-4 times of energy efficiency improvement effect of the heat pump, so that the heat pump is more likely to evaporate, dehumidify and concentrate in the field of sewage evaporation and concentration.
Disclosure of Invention
The invention aims to provide a low-temperature multi-effect evaporation sewage concentration device with a fin heat pipe, which has the advantages of low energy consumption, simple operation, automation degree, realization of standardized production, great investment and operation cost saving, and solves the problems of large equipment investment, high energy consumption, complex operation flow, non-standard manufacturing process of a conventional heat pipe heat exchanger, unstable quality and the like in the prior art.
The invention provides a fin heat pipe low-temperature multi-effect evaporation sewage concentration device, which comprises at least two stages of concentration evaporation devices connected in series, and the device comprises:
the first heat exchange cavity is provided with a liquid-gas heat exchanger, a heat pipe evaporation end of a second heat pipe, a high-temperature fan and a heat pump condenser in sequence from a high-temperature wet air inlet end of the first heat exchange cavity according to the flowing direction of high-temperature circulating air; the liquid-gas heat exchanger fins are vertically arranged, are parallel to the flowing direction of circulating air and are vertical to the direction of a fin transverse pipe (a flow path of a sewage stock solution), and absorb heat through the sewage stock solution of the liquid-gas heat exchanger and enable water vapor in high-temperature wet air to be condensed by condensation, so that the amount of condensed water is increased, the heat of the sewage stock solution is increased, the subsequent evaporation is facilitated, the evaporation energy efficiency of a system can be increased, and the lower part of the first heat exchange chamber is a high-temperature condenser; the liquid-gas heat exchanger is communicated with the medium temperature evaporator through a feed liquid port; the second heat pipe is divided into an upper part and a lower part, fins of the second heat pipe are horizontally arranged and are vertical to the direction of the refrigerant pipe, the upper part is positioned in the second heat exchange chamber to form a heat pipe condensation end, and the lower part is positioned in the first heat exchange chamber to form a heat pipe evaporation end; the air outlet of the first heat exchange cavity, the air inlet of the high-temperature evaporator, the air outlet of the high-temperature evaporator and the air inlet of the first heat exchange cavity are sequentially connected through pipelines to form a high-temperature circulating air flow path;
the second heat exchange cavity is internally provided with a medium temperature fan and a heat pipe condensation end of a second heat pipe in sequence from a medium temperature dry air inlet end according to the flowing direction of medium temperature circulating air; the second heat exchange cavity air outlet, the medium temperature evaporator air inlet, the medium temperature evaporator air outlet, the medium temperature condenser air inlet, the medium temperature condenser air outlet and the second heat exchange cavity air inlet are sequentially connected through pipelines to form a medium temperature circulating air flow path.
Furthermore, a high-temperature circulating pump is arranged at a discharge liquid port of the high-temperature evaporator, a high-temperature liquid circulating loop is formed between the high-temperature evaporator and the high-temperature circulating pump, and the high-temperature evaporator is communicated with a medium-temperature circulating pump pipeline.
Furthermore, a medium-temperature circulating pump is arranged at a discharge liquid port of the medium-temperature evaporator, and a medium-temperature liquid circulating loop is formed between the medium-temperature evaporator and the medium-temperature circulating pump.
Further, the heat pump unit comprises a heat pump evaporator and a heat pump condenser, and the heat pump unit is arranged between the heat pump condenser and the heat pump evaporator to perform refrigerant circulation and heat exchange.
Furthermore, a control valve is arranged on a communication pipeline between the high-temperature evaporator and the medium-temperature circulating pump.
The second purpose of the invention is to provide a fin heat pipe low-temperature multi-effect evaporation sewage concentration process, which at least comprises a medium-temperature-level concentration evaporation section and a high-temperature-level concentration evaporation section, wherein:
the medium-temperature stage concentration evaporation section comprises the following steps that sewage and high-temperature wet air are subjected to heat exchange to obtain temperature-rising sewage;
atomizing the heated sewage after absorbing heat to obtain water mist, and heating and evaporating the water mist through medium-temperature dry air to obtain medium-temperature wet air;
carrying out heat exchange and dehumidification on the medium-temperature and humid air to obtain low-temperature dry air and condensed water;
and exchanging heat with the low-temperature dry air to obtain the medium-temperature dry air.
The high-temperature-stage concentration evaporation section comprises the following steps: after the high-temperature wet air exchanges heat with the sewage stock solution, partial steam in the high-temperature wet air is condensed, the partially dehumidified higher-temperature wet air continuously exchanges heat with medium-temperature dry air outside a condensation end of the heat pipe at an evaporation end of the heat pipe through the heat pipe, the moisture is condensed into higher-temperature dry air, and the higher-temperature dry air exchanges heat with a heat pump condenser to be heated to obtain high-temperature dry air;
and circularly atomizing the high-temperature liquid to obtain water mist, and heating and evaporating the water mist by high-temperature dry air to obtain high-temperature wet air and a sewage concentrated solution.
Further, the steps specifically include: cold sewage stock solution flows through a liquid-gas heat exchanger in a second heat exchange chamber of the high-temperature condenser with the high-temperature-level concentration evaporation section, and the sewage stock solution in the pipe absorbs heat and is heated;
the heated sewage stock solution enters a medium-temperature stage concentration evaporation section, is pressurized by a circulating pump of the medium-temperature section and is mixed with circulating liquid from a medium-temperature evaporator, and is sprayed on the top of the medium-temperature evaporator, and fog drops exchange heat with medium-temperature circulating dry air heated by a condensation end of a heat pipe for evaporation; the medium-temperature circulating dry air absorbs moisture to become medium-temperature wet air, then flows into a heat pump evaporator in a medium-temperature condenser to release heat and dehumidify, then flows into a condensation end of a heat pipe through a medium-temperature fan to heat and absorb heat to become medium-temperature circulating dry air, and then flows into a medium-temperature evaporator to absorb moisture circularly; discharging purified medium-temperature condensed water from a medium-temperature condensed water outlet at the bottom of the medium-temperature condenser;
part of the pre-concentrated sewage enters a high-temperature stage concentration evaporation section through a control valve, is mixed with circulating liquid pressurized by a high-temperature circulating pump and coming from a high-temperature evaporator, is sprayed on the top of the high-temperature evaporator, and fog drops exchange heat with high-temperature circulating dry air heated by a heat pump condenser for evaporation; the moisture absorption becomes high-temperature wet air, the high-temperature wet air flows into the evaporation end of the heat pipe in the high-temperature condenser to release heat and remove moisture, then the high-temperature wet air enters the heat pump condenser through the high-temperature fan to be heated and absorb heat to become high-temperature circulating dry air, and the high-temperature circulating dry air flows into the high-temperature evaporator to absorb moisture in a circulating manner; the purified high-temperature condensed water is discharged from a high-temperature condensed water outlet at the bottom of the high-temperature condenser; the concentrated solution is discharged from a concentrated solution outlet at the bottom of the high-temperature evaporator.
Description of the principle: cold sewage stock solution flows through the liquid-gas heat exchanger arranged in the second heat exchange chamber of the high-temperature-level concentration evaporation section high-temperature condenser, the sewage stock solution in the pipe absorbs heat and is heated, high-temperature wet air outside the pipe releases heat and is condensed and dewed, so that the condensation capacity of the high-temperature condenser is improved, and meanwhile, the evaporation efficiency of the system can be increased by absorbing heat of the sewage stock solution.
The heated sewage stock solution enters a medium-temperature stage concentration evaporation section, is pressurized by a circulating pump at a medium-temperature section, is mixed with circulating liquid from a medium-temperature evaporator, is sprayed at the top of the medium-temperature evaporator, and is subjected to heat exchange evaporation by fog drops and medium-temperature circulating dry air heated by a condensation end of a heat pipe; the medium-temperature circulating dry air absorbs moisture to become medium-temperature wet air, then flows into a heat pump evaporator in a medium-temperature condenser to release heat and dehumidify, then flows into a condensation end of a heat pipe through a medium-temperature fan to heat and absorb heat to become medium-temperature circulating dry air, and then flows into a medium-temperature evaporator to absorb moisture circularly; the purified middle-temperature condensed water is discharged from a middle-temperature condensed water outlet at the bottom of the middle-temperature condenser.
Part of the pre-concentrated sewage enters a high-temperature stage concentration evaporation section through a control valve, is mixed with circulating liquid pressurized by a high-temperature circulating pump and coming from a high-temperature evaporator, is sprayed on the top of the high-temperature evaporator, and fog drops exchange heat with high-temperature circulating dry air heated by a heat pump condenser for evaporation; the moisture absorption becomes high-temperature wet air, the high-temperature wet air flows into the evaporation end of the heat pipe in the high-temperature condenser to release heat and remove moisture, then the high-temperature wet air enters the heat pump condenser through the high-temperature fan to be heated and absorb heat to become high-temperature circulating dry air, and the high-temperature circulating dry air flows into the high-temperature evaporator to absorb moisture in a circulating manner; the purified high-temperature condensed water is discharged from a high-temperature condensed water outlet at the bottom of the high-temperature condenser; the concentrated solution is discharged from a concentrated solution outlet at the bottom of the high-temperature evaporator.
The heat pipe can be simply modified by adopting a fin heat exchanger which is a standard product for a conventional air conditioner and a heat pump, the inlet and the outlet of a refrigerant pipe of the fin heat exchanger are sealed, a small amount of refrigerant is charged into the refrigerant pipe after the refrigerant pipe is vacuumized, and the charging amount of the refrigerant is about 1/5 of the mass corresponding to the saturated vapor pressure of the refrigerant at the working temperature of the heat pipe. During installation, the refrigerant pipe is kept in the vertical direction, so that efficient heat transfer of the heat pipe is facilitated, and the fins are in the horizontal direction. The fins of the heat pipe are partitioned by partition plates, the upper part of the heat pipe is a heat pipe condensation end, and the heat pipe condensation end is arranged behind a medium-temperature fan at a medium-temperature-level concentration evaporation section; the lower part is a heat pipe evaporation end which is arranged in a high-temperature condenser at a high-temperature stage concentration evaporation section, and the heat pipe adopts a general product fin heat exchanger, which is beneficial to simultaneously improving the heat exchange efficiency of the heat pipe and reducing the equipment cost.
The liquid-gas heat exchanger can be modified by adopting a fin heat exchanger which is a standard product for a conventional air conditioner and a heat pump, raw liquid flows in the tube, high-temperature wet air from a high-temperature evaporator outside the tube exchanges heat with the fins, and the fin heat exchanger which is a universal product is adopted, so that the heat exchange efficiency is improved, and the equipment cost is reduced.
The device and the process for concentrating sewage by low-temperature multi-effect evaporation of the finned heat pipe adopt a heat pump countercurrent two-stage evaporation concentration technology under the conditions of low-temperature and low-pressure evaporation concentration, and have low energy consumption and low investment cost; the heat pipe technology of the fin heat exchanger is adopted, so that the heat exchange efficiency is high and the cost is low; the heat pipe is simply modified by adopting a fin heat exchanger which is a universal product, so that the heat exchange efficiency and reliability of the heat pipe can be improved, and the cost can be reduced; the liquid-gas heat exchanger heat recovery technology is adopted, and the double effects of heat recovery/cold recovery are achieved; the liquid-gas heat exchanger directly adopts a general product fin heat exchanger, which is beneficial to simultaneously improving the heat exchange efficiency and reliability and reducing the cost.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention.
In the figure, a liquid-gas heat exchanger-1, a medium-temperature evaporator-2, a medium-temperature condenser-3, a second heat pipe-4, a medium-temperature fan-5, a heat pipe condensation end-6, a refrigerant pipe-7, a heat pipe evaporation end-8, a high-temperature condenser-9, a heat pump evaporator-10, a heat pump condenser-11, a high-temperature evaporator-12, a medium-temperature circulating pump-13, a high-temperature circulating pump-14, a control valve-15, a high-temperature fan-16, fins-17, an atomizing pipe-18, a heat pump unit-19, a first heat exchange chamber-20 and a second heat exchange chamber-21.
Detailed Description
In a first embodiment, the present invention provides a low-temperature multi-effect evaporation sewage concentration apparatus with fin heat pipes, as shown in fig. 1, the apparatus includes: including the concentrated evaporation plant of at least second grade series connection, the device includes first heat transfer cavity 20 and second heat transfer cavity 21 and liquid-gas heat exchanger 1, medium temperature evaporimeter 2, medium temperature condenser 3, second heat pipe 4, medium temperature fan 5, heat pipe condensation end 6, refrigerant pipe 7, heat pipe evaporation end 8, high temperature condenser 9, heat pump evaporimeter 10, heat pump condenser 11, high temperature evaporimeter 12, medium temperature circulating pump 13, high temperature circulating pump 14, control flap 15, high temperature fan 16, fin 17, wherein:
the liquid-gas heat exchanger 1, the heat pipe evaporation end 8 of the second heat pipe 4, the high-temperature fan 16 and the heat pump condenser 11 are sequentially arranged from the high-temperature wet air inlet end of the first heat exchange chamber according to the flowing direction of high-temperature circulating air; the liquid-gas heat exchanger fins are vertically arranged, are parallel to the flowing direction of circulating air and are vertical to the direction of a fin transverse pipe (a flow path of a sewage stock solution), and absorb heat through the sewage stock solution of the liquid-gas heat exchanger and enable water vapor in high-temperature wet air to be condensed by condensation, so that the amount of condensed water is increased, the heat of the sewage stock solution is increased, the subsequent evaporation is facilitated, the evaporation energy efficiency of a system is increased, and a high-temperature condenser 9 is arranged at the lower part of a first heat exchange chamber; the medium temperature evaporator 2 is provided with a feeding liquid port, a medium temperature humid air outlet, a discharging liquid port and a medium temperature dry air inlet, the liquid-gas heat exchanger is communicated with the medium temperature evaporator through the feeding liquid port, and the medium temperature evaporator outlet is connected with the medium temperature condenser 3; the second heat exchange cavity is provided with a second heat pipe, fins of the second heat pipe are horizontally arranged and are vertical to the direction of the refrigerant pipe 7, the second heat pipe is divided into an upper part and a lower part, the upper part is positioned in the second heat exchange cavity to form a heat pipe condensation end 6, the lower part is positioned in the first heat exchange cavity to form a heat pipe evaporation end 8, the second heat exchange cavity is communicated with the medium temperature condenser and the medium temperature evaporator, and the air inlet is provided with a medium temperature fan 5; a high-temperature fan 16 is arranged at an air outlet of the first heat exchange chamber, and a high-temperature condenser 9 is arranged between the evaporation end of the heat pipe and the high-temperature fan; and a heat pump unit 19 is arranged between the medium-temperature condenser and the high-temperature condenser for heat exchange.
In the embodiment, a medium-temperature circulating pump 13 is arranged at a discharge liquid port of the medium-temperature evaporator, a medium-temperature liquid circulating loop is formed between the medium-temperature evaporator and the medium-temperature circulating pump, and the medium-temperature evaporator is communicated with a medium-temperature circulating pump pipeline.
In this embodiment, a high-temperature circulating pump 14 is disposed at a discharge liquid outlet of the high-temperature evaporator 12, and a high-temperature liquid circulating loop is formed between the high-temperature evaporator and the high-temperature circulating pump 16.
The heat pump unit 19 of this embodiment includes a heat pump evaporator 10 and a heat pump condenser 11, and a heat pump unit is disposed between the heat pump condenser and the heat pump evaporator to perform refrigerant circulation and heat exchange.
The high-temperature evaporator and the medium-temperature circulating pump communicating pipe of the embodiment is provided with a control valve 15.
Example 2: a concentration process of low-temperature multi-effect evaporation sewage of a finned heat pipe uses the concentration device of low-temperature multi-effect evaporation sewage of the finned heat pipe in embodiment 1, and comprises the following steps:
the method at least comprises a medium-temperature-level concentration evaporation section and a high-temperature-level concentration evaporation section, wherein the medium-temperature-level concentration evaporation section comprises the following steps: heat exchange is carried out between the sewage and the high-temperature humid air to obtain heat absorption sewage;
carrying out atomization treatment on the sewage after heat absorption to obtain water mist, and heating and evaporating the water mist through medium-temperature dry air to obtain medium-temperature wet air;
condensing the medium-temperature humid air to obtain low-temperature dry air and condensed water;
and exchanging heat with the low-temperature dry air to obtain the medium-temperature dry air.
The high-temperature-stage concentration evaporation section comprises the following steps: after the high-temperature wet air exchanges heat with the sewage stock solution, partial steam in the high-temperature wet air is condensed, the partially dehumidified higher-temperature wet air continuously exchanges heat with medium-temperature dry air outside a condensation end of the heat pipe at an evaporation end of the heat pipe through the heat pipe, the moisture is condensed into higher-temperature dry air, and the higher-temperature dry air exchanges heat with a heat pump condenser to be heated to obtain high-temperature dry air;
and atomizing the high-temperature liquid to obtain water mist, and heating and evaporating the water mist by high-temperature dry air to obtain high-temperature wet air and a sewage concentrated solution.
The steps are specifically as follows: cold sewage stock solution flows through a liquid-gas heat exchanger in a second heat exchange chamber of the high-temperature condenser with the high-temperature-level concentration evaporation section, and the sewage stock solution in the pipe absorbs heat and is heated; the high-temperature wet air outside the pipe releases heat, condenses and dews, so that the condensation amount of the high-temperature condenser is increased, and meanwhile, the sewage stock solution absorbs heat to increase the evaporation energy efficiency of the system;
the heated sewage stock solution enters a medium-temperature stage concentration evaporation section, is pressurized by a circulating pump at a medium-temperature section, is mixed with circulating liquid from a medium-temperature evaporator, is sprayed at the top of the medium-temperature evaporator through a spraying pipe 18, and fog drops exchange heat with medium-temperature circulating dry air heated by a condensation end of a heat pipe for evaporation; the medium-temperature circulating dry air absorbs moisture to become medium-temperature wet air, then flows into a heat pump evaporator in a medium-temperature condenser to release heat and dehumidify, then flows into a condensation end of a heat pipe through a medium-temperature fan to heat and absorb heat to become medium-temperature circulating dry air, and then flows into a medium-temperature evaporator to absorb moisture circularly; the purified middle-temperature condensed water is discharged from a middle-temperature condensed water outlet at the bottom of the middle-temperature condenser.
Part of the pre-concentrated sewage enters a high-temperature stage concentration evaporation section through a control valve, is mixed with circulating liquid which is pressurized by a high-temperature circulating pump and comes from a high-temperature evaporator, is sprayed on the top of the high-temperature evaporator (the spraying pipe 18 is also arranged), and fog drops exchange heat with high-temperature circulating dry air heated by a heat pump condenser for evaporation; the moisture absorption becomes high-temperature wet air, the high-temperature wet air flows into the evaporation end of the heat pipe in the high-temperature condenser to release heat and remove moisture, then the high-temperature wet air enters the heat pump condenser through the high-temperature fan to be heated and absorb heat to become high-temperature circulating dry air, and the high-temperature circulating dry air flows into the high-temperature evaporator to absorb moisture in a circulating manner; the purified high-temperature condensed water is discharged from a high-temperature condensed water outlet at the bottom of the high-temperature condenser; the concentrated solution is discharged from a concentrated solution outlet at the bottom of the high-temperature evaporator.
The second heat pipe 4 of the embodiment is simply modified by adopting a fin heat exchanger which is a standardized product for a conventional air conditioner and a heat pump, the inlet and the outlet of a refrigerant pipe of the fin heat exchanger are sealed, a small amount of refrigerant is charged after the pipe is vacuumized, and the charging amount of the refrigerant is about 1/5 of the mass corresponding to the saturated vapor pressure of the refrigerant at the working temperature of the heat pipe. During installation, the refrigerant pipe is kept in the vertical direction, so that efficient heat transfer of the heat pipe is facilitated, and the fins are in the horizontal direction. The fins 17 of the heat pipe are partitioned by partition plates, the upper part of the heat pipe is a heat pipe condensation end, and the heat pipe condensation end is arranged behind a medium-temperature fan at a medium-temperature-level concentration evaporation section; the lower part is a heat pipe evaporation end and is arranged in a high-temperature condenser of a high-temperature stage concentration evaporation section. The fin heat exchanger is a mature product with high efficiency and low cost produced in large scale, and the heat pipe adopts a general product fin heat exchanger, which is beneficial to simultaneously improving the heat exchange efficiency of the heat pipe and reducing the equipment cost.
The liquid-gas heat exchanger 1 of the embodiment is directly refitted by a fin heat exchanger which is a standard product for a conventional air conditioner and a heat pump, raw liquid is led out of the tube, a plurality of fins are longitudinally arranged and are vertical to the flowing direction of sewage, and high-temperature wet air coming from a high-temperature evaporator outside the tube exchanges heat with the fins. The fin heat exchanger is a mature product with high efficiency and low cost produced in large scale, and the fin heat exchanger adopting a general product is beneficial to simultaneously improving the heat exchange efficiency and reducing the equipment cost.
Compared with the electric boiler evaporation concentration/MVR vapor compression evaporation concentration/heat pump low-temperature vacuum evaporation concentration device, the device and the treatment process disclosed by the embodiments 1 and 2 of the invention have the advantages that the cost can be greatly reduced by about 80-40%;
compared with the ton water evaporation energy consumption of about 250kwh of a conventional heat pump evaporation, dehumidification and concentration device, the low-temperature multi-effect evaporation sewage concentration technology can reach the ton water evaporation energy consumption of about 125kwh, the energy consumption can be greatly reduced by about 50%, and the energy is saved and the cost is reduced;
compared with other heat pipe heat exchangers, the fin heat exchanger has the advantages of high reliability, high efficiency and low cost.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a fin heat pipe low temperature multiple effect evaporation sewage enrichment facility which characterized in that, the device includes the concentrated vaporization system of at least second grade series connection, and the system includes: the heat pipe comprises an upper heat pipe condensation end and a lower heat pipe evaporation end, the liquid-gas heat exchanger, the heat pipe evaporation end, the high-temperature fan and the heat pump condenser are sequentially arranged from a high-temperature wet air inlet end of the first heat exchange chamber according to the flowing direction of high-temperature circulating air, and the high-temperature condenser is arranged at the lower part of the first heat exchange chamber; the medium temperature fan and the heat pipe condensation end are sequentially arranged in the second heat exchange cavity from the medium temperature dry air inlet end according to the flowing direction of medium temperature circulating air, and the second heat exchange cavity air outlet, the medium temperature evaporator air inlet, the medium temperature evaporator air outlet, the medium temperature condenser air inlet, the medium temperature condenser air outlet and the second heat exchange cavity air inlet are sequentially connected through pipelines to form a medium temperature circulating air flow path.
2. The finned heat pipe low-temperature multi-effect evaporation sewage concentration device as claimed in claim 1, wherein the heat pipe is a finned heat exchanger, and a plurality of fins are horizontally arranged and are vertical to the direction of the refrigerant pipe.
3. The finned heat pipe low-temperature multi-effect evaporation sewage concentration device as claimed in claim 2, wherein the heat pipe is a standardized finned heat exchanger for a conventional air conditioner or heat pump, an inlet and an outlet of a refrigerant pipe of the finned heat exchanger are closed, and refrigerant is filled in the pipe.
4. The finned heat pipe low-temperature multi-effect evaporation sewage concentration device as claimed in claim 3, wherein the amount of the refrigerant is about 1/5 of the mass corresponding to the saturated vapor pressure of the refrigerant at the working temperature of the heat pipe.
5. The finned heat pipe low-temperature multi-effect evaporation sewage concentration device according to claim 1, wherein the liquid-gas heat exchanger is a standardized finned heat exchanger for a conventional air conditioner or heat pump, raw liquid flows in the pipe, and a plurality of fins are vertically arranged and perpendicular to the flowing direction of the raw sewage.
6. The finned heat pipe low-temperature multi-effect evaporation sewage concentration device according to claim 4 or 5, wherein a medium-temperature circulating pump is arranged at a discharge liquid port of the medium-temperature evaporator, and a medium-temperature liquid circulating loop is formed between the medium-temperature evaporator and the medium-temperature circulating pump; the high-temperature evaporator discharge liquid opening is provided with a high-temperature circulating pump, and a high-temperature feed liquid circulating loop is formed between the high-temperature evaporator and the high-temperature circulating pump.
7. The fin heat pipe low-temperature multi-effect evaporation sewage concentration device as claimed in claim 6, wherein the heat pump unit comprises a heat pump evaporator and a heat pump condenser, and the heat pump unit is arranged between the heat pump condenser and the heat pump evaporator to perform refrigerant circulation and heat exchange.
8. The finned heat pipe low-temperature multi-effect evaporation sewage concentration device according to claim 7, wherein a control valve is arranged on a communication pipeline between the high-temperature evaporator and the medium-temperature circulating pump.
9. A sewage concentration process by low-temperature multi-effect evaporation of a finned heat pipe at least comprises a medium-temperature-level concentration evaporation section and a high-temperature-level concentration evaporation section, and is characterized in that the medium-temperature-level concentration evaporation section comprises the following steps: obtaining temperature-rising sewage after the sewage exchanges heat with high-temperature wet air;
atomizing the heated sewage after absorbing heat to obtain water mist, and heating and evaporating the water mist through medium-temperature dry air to obtain medium-temperature wet air;
medium-temperature dry air and condensate water are obtained by heat exchange and dehumidification of the medium-temperature wet air;
the medium-temperature dry air is subjected to heat exchange to become the medium-temperature dry air;
the high-temperature-stage concentration evaporation section comprises the following steps: after the high-temperature wet air exchanges heat with the sewage stock solution, partial steam in the high-temperature wet air is condensed, the partially dehumidified higher-temperature wet air continuously exchanges heat with medium-temperature dry air outside a condensation end of the heat pipe at an evaporation end of the heat pipe through the heat pipe, the moisture is condensed into higher-temperature dry air, and the higher-temperature dry air exchanges heat with a heat pump condenser to be heated to obtain high-temperature dry air;
and circularly atomizing the high-temperature liquid to obtain water mist, and heating and evaporating the water mist by high-temperature dry air to obtain high-temperature wet air and a sewage concentrated solution.
10. The fin heat pipe low-temperature multi-effect evaporation sewage concentration process according to claim 8, characterized in that the steps specifically are as follows: cold sewage stock solution flows through a liquid-gas heat exchanger in a second heat exchange chamber of the high-temperature condenser with the high-temperature-level concentration evaporation section, and the sewage stock solution in the pipe absorbs heat and is heated;
the heated sewage stock solution enters a medium-temperature stage concentration evaporation section, is pressurized by a circulating pump at a medium-temperature section, is mixed with circulating liquid from a medium-temperature evaporator, is sprayed at the top of the medium-temperature evaporator, and is subjected to heat exchange evaporation by fog drops and medium-temperature circulating dry air heated by a condensation end of a heat pipe; the medium-temperature circulating dry air absorbs moisture to become medium-temperature wet air, then flows into a heat pump evaporator in a medium-temperature condenser to release heat and dehumidify, then flows into a condensation end of a heat pipe through a medium-temperature fan to heat and absorb heat to become medium-temperature circulating dry air, and then flows into a medium-temperature evaporator to absorb moisture circularly; discharging purified medium-temperature condensed water from a medium-temperature condensed water outlet at the bottom of the medium-temperature condenser;
part of the pre-concentrated sewage enters a high-temperature stage concentration evaporation section through a control valve, is pressurized by a high-temperature circulating pump, is mixed with circulating liquid from a high-temperature evaporator, is sprayed on the top of the high-temperature evaporator, and is subjected to heat exchange evaporation by fog drops and high-temperature circulating dry air heated by a heat pump condenser; the moisture absorption becomes high-temperature wet air, the high-temperature wet air flows into the evaporation end of the heat pipe in the high-temperature condenser to release heat and remove moisture, then the high-temperature wet air enters the heat pump condenser through the high-temperature fan to be heated and absorb heat to become high-temperature circulating dry air, and the high-temperature circulating dry air flows into the high-temperature evaporator to absorb moisture in a circulating manner; the purified high-temperature condensed water is discharged from a high-temperature condensed water outlet at the bottom of the high-temperature condenser; the concentrated solution is discharged from a concentrated solution outlet at the bottom of the high-temperature evaporator.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113979500A (en) * | 2021-11-09 | 2022-01-28 | 山东凯翔传热科技有限公司 | Concentrated water purification equipment and purification method thereof |
| CN114103592A (en) * | 2021-11-22 | 2022-03-01 | 泉州装备制造研究所 | Movable container type heat pump drying system, transport vehicle and drying method |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113979500A (en) * | 2021-11-09 | 2022-01-28 | 山东凯翔传热科技有限公司 | Concentrated water purification equipment and purification method thereof |
| CN114103592A (en) * | 2021-11-22 | 2022-03-01 | 泉州装备制造研究所 | Movable container type heat pump drying system, transport vehicle and drying method |
| CN114103592B (en) * | 2021-11-22 | 2023-11-21 | 泉州装备制造研究所 | Movable container type heat pump drying system, transport vehicle and drying method |
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