CN109798696B - High-temperature heat pump system for recovering waste heat of industrial wastewater by using water as working medium and control method thereof - Google Patents
High-temperature heat pump system for recovering waste heat of industrial wastewater by using water as working medium and control method thereof Download PDFInfo
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- CN109798696B CN109798696B CN201910063411.8A CN201910063411A CN109798696B CN 109798696 B CN109798696 B CN 109798696B CN 201910063411 A CN201910063411 A CN 201910063411A CN 109798696 B CN109798696 B CN 109798696B
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Abstract
The invention provides a high-temperature heat pump system and a method for recovering waste heat of industrial wastewater by using water as a working medium, wherein the high-temperature heat pump system comprises an evaporator, a water vapor compressor, a contact condenser, a first heat exchanger, a second heat exchanger and an electric water tank, a steam outlet of the evaporator is connected with an inlet of the water vapor compressor, an outlet of the water vapor compressor is connected with an inlet at the bottom of the contact condenser, one path of the industrial wastewater is connected with a heat exchange tube in the evaporator, the industrial wastewater flows out after being preheated by the first heat exchanger and supplemented with water, the other path of the industrial wastewater is heated by the second heat exchanger, one path of the heated supplemented water is sprayed into the evaporator, and the other. The industrial waste water waste heat recovery heat pump system provided by the invention takes water as a working medium, is non-toxic, environment-friendly and efficient, can recover the waste heat of the industrial waste water of more than 50 ℃, and provides high-quality high-temperature hot water for life use at the temperature of more than 80 ℃.
Description
Technical Field
The invention belongs to the field of energy conservation and emission reduction of power plant electricity, refrigeration and waste heat recovery, and particularly relates to a heat pump system for industrial wastewater waste heat recovery and a control method thereof.
Background
Along with the increasingly prominent energy and environmental problems and the improvement of the requirements of people on the living level, the energy consumption and the influence on the environment in the industrial production process are also continuously paid attention, and the significance and the importance of energy conservation and emission reduction are particularly prominent. In the industrial fields of printing and dyeing, steel and the like, a large amount of heat energy needs to be consumed in the production process, meanwhile, industrial wastewater with the temperature higher than 50 ℃ is discharged, the wastewater contains a large amount of waste heat, the direct discharge also can affect the environment and river ecology, how to effectively recycle and utilize the waste heat of the wastewater can be realized, and meanwhile, the technical development requirements of energy conservation and emission reduction of the industrial production or life need to be met.
The heat pump technology is an efficient technology recognized in the industry and capable of realizing waste heat recovery, can recover medium-low temperature waste heat, and can be continuously used in industrial production or domestic heat supply and heating processes after the energy grade or temperature of the waste heat is improved. The heat pump system can be combined with a plurality of industrial productions to recover low-grade waste heat in different forms, but the heat pump system is limited by a heat pump working medium, the temperature of a heat source provided by the heat pump system is usually not more than 80 ℃, the heat supply requirements of some industrial productions cannot be met, and the unnatural working medium also has the environmental influence of temperature rise effect and ozone layer destruction.
Researches show that when the evaporation temperature is higher than 30 ℃, the COP of a refrigeration system using water as a working medium is higher than that of systems using other working media, and the critical temperature of the water is 374.15 ℃, so that the two points show that the water is used as a non-toxic, pollution-free and easily-obtained natural working medium and can be used as a working medium of a high-temperature heat pump to overcome the limitation that the conventional refrigeration working medium is not higher than the heating temperature of 80 ℃.
In addition, in some remote areas, the industrial process can consume lake water, river water and the like to meet the technical process of industrial cooling and the like, and simultaneously generate industrial wastewater with a certain temperature.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, the invention provides a high-temperature heat pump system taking water as a working medium and a control method, which are used for recovering the waste heat of industrial wastewater with the temperature of more than 50 ℃, introducing a contact condenser, improving the heat exchange efficiency and the system performance of the condenser, simultaneously providing high-temperature distilled water with the temperature of more than 80 ℃, meeting the requirements of heat supply and heating in an industrial process and the domestic water of workers, further improving the energy efficiency in an industrial production process, reducing the cost and reducing the region limitation.
The technical scheme is as follows: in order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows: a high-temperature heat pump system for recovering waste heat of industrial wastewater by using water as a working medium comprises an evaporator, a steam compressor, a contact condenser, a first heat exchanger, a make-up water pump, a second heat exchanger, an electric hot water tank and a spray water pump, wherein a heat exchange tube, a spray tube and a filter screen are arranged in the evaporator, a filler, the spray tube and the filter screen are arranged in the contact condenser, steam in the evaporator passes through the filter screen and then is connected with an inlet of the steam compressor through a first valve, an outlet of the steam compressor is connected to a bottom inlet of the contact condenser through a second valve, more than 50 ℃ of industrial wastewater flows out through the first regulating valve after passing through the heat exchange tube and the first heat exchanger, and flows out through the second regulating valve and the second heat exchanger,
the make-up water is connected to the inlet of the make-up water pump through the first heat exchanger and the third regulating valve, the outlet of the make-up water pump is connected to the second heat exchanger, the make-up water outlet of the second heat exchanger is divided into two paths, one path is connected to the spray pipe through the third valve, the other path is connected to the electric heating water tank through the fourth regulating valve, and the hot water outlet of the electric heating water tank is connected to the spray pipe through the spray water pump and the fifth regulating valve.
Furthermore, the outlets at the tops of the evaporator and the contact condenser are respectively connected with a vacuum pump through a fourth valve and a fifth valve, and the vacuum pumps are used for vacuumizing the system or regulating the vacuum degree in the evaporator and the contact condenser.
Furthermore, a hot water outlet of the evaporator is connected to an inlet of the supplementary water pump through a sixth regulating valve, so that water which is not evaporated in the evaporator continuously participates in system circulation; and the outlet of the contact condenser is connected with a water supply pump through a sixth valve, and high-temperature water with the temperature of more than 80 ℃ is supplied to the tail end of heat supply or water use.
Further, the contact condenser steam outlet is also connected to the inlet of the water vapor compressor through a seventh regulating valve.
The invention also comprises the control method of the high-temperature heat pump system for recovering the waste heat of the industrial wastewater by using water as the working medium, which comprises the following steps:
the method comprises the following steps: opening a second valve, a fourth valve and a fifth valve, starting a vacuum pump to vacuumize the system, and closing the second valve, the fourth valve, the fifth valve and the vacuum pump after the vacuum degree meets the requirement; meanwhile, an electric heater in the electric water heating tank is started to heat water in the electric water heating tank, and the electric heater in the electric water heating tank is turned off when the water temperature reaches a set value;
step two: opening a first regulating valve and a second regulating valve, enabling waste water with the temperature of more than 50 ℃ to enter a heat exchange pipe through the first regulating valve in one path, enabling the waste water flowing out of the heat exchange pipe to continuously flow into a first heat exchanger for heat release and then to be discharged, and enabling the waste water in the other path to flow into a second heat exchanger for heat release and then to be discharged through the second regulating valve; opening a third adjusting valve, a make-up water pump and a third valve at the same time, preheating make-up water by the first heat exchanger, then continuously heating in the second heat exchanger, and then spraying into the evaporator through the spray pipe, wherein when spray water flows through the surface of the heat exchange pipe, the heat of waste water in the absorption pipe is evaporated to generate low-temperature water vapor; when the temperature of the waste water is lower than 50 ℃, the feasibility and the economical efficiency of the system cannot be guaranteed because the temperature and the pressure of steam which can be evaporated are too low, so that the temperature of the waste water entering the system is required to be higher than 50 ℃;
step three: opening the first valve and the second valve, starting the water vapor compressor, filtering liquid drops of low-temperature water vapor obtained by evaporation in the evaporator by a filter screen, then entering the water vapor compressor through the first valve for compression, and allowing the compressed high-temperature water vapor to flow into the bottom inlet of the contact condenser through the second valve; simultaneously starting a spray water pump and a fifth regulating valve, spraying water in the electric water heating tank into the contact condenser through the spray water pump, the fifth regulating valve and a spray pipe, condensing the steam through contact heat exchange of the filler and the compressed steam, and storing the sprayed water at the bottom of the contact condenser after absorbing heat and heating and mixing with the condensed water;
step four: opening a fourth regulating valve to make part of the make-up water flowing out of the second heat exchanger pass through the fourth regulating valve and be made up into the electric water tank, and further making the temperature of the inflowing make-up water meet the requirement by using an electric heater in the electric water tank, and then spraying the make-up water into the contact condenser to exchange heat with the compressed steam;
step five: opening a seventh regulating valve to enable the uncondensed compressed steam in the contact condenser to return to a steam suction pipeline of the water vapor compressor, and continuing to enter the contact condenser to release heat and condense after being compressed by the water vapor compressor;
step six: the non-evaporated spray water in the evaporator is accumulated at the bottom of the evaporator, and when the liquid level reaches a set threshold value, the sixth regulating valve is opened, so that the non-evaporated spray water is mixed with the make-up water flowing out of the first heat exchanger and then continuously participates in circulation through the make-up water pump; and opening the sixth valve and the water supply pump, and pumping out the high-temperature water obtained in the contact condenser as a heat source to meet the application requirements of heat supply in the industrial process, industrial domestic water and the like.
The first regulating valve is used for regulating the flow of the industrial wastewater with the temperature of more than 50 ℃ entering the heat exchange tube, the opening degree of the first regulating valve is inversely related to the temperature of the outlet water of the heat exchange tube of the evaporator, the second regulating valve is used for regulating the temperature of the make-up water flowing out of the second heat exchanger, and the opening degree of the second regulating valve is inversely related to the temperature of the make-up water flowing out of the second heat exchanger.
Furthermore, the third regulating valve is used for adjusting the supply water amount, the opening degree of the third regulating valve is positively correlated with the steam flow of the steam compressor, namely, the larger the compressed steam flow is, the larger the water spray amount which needs to be sprayed into the evaporator for heat absorption and evaporation and the water spray amount which needs to be sprayed into the contact condenser for heat absorption and temperature rise and condensation and compression of the steam are, and then the supply water flow needs to be increased.
Furthermore, the fourth regulating valve is used for regulating the flow of make-up water entering the electric water heating tank, and the opening degree of the fourth regulating valve is inversely related to the liquid level in the electric water heating tank; and the fifth regulating valve is used for regulating the flow of spray water in the contact condenser, and the opening degree of the fifth regulating valve is positively correlated with the water temperature at the bottom of the contact condenser.
Further, the sixth regulating valve is used for liquid level regulation in the evaporator, and the opening degree of the sixth regulating valve is positively correlated with the liquid level in the evaporator.
Further, the seventh regulating valve is used for pressure regulation in the contact condenser, and the opening degree of the seventh regulating valve is positively correlated with the pressure in the contact condenser.
The make-up water is sprayed into the evaporator to absorb waste heat of the waste water and evaporate to generate steam, and is sprayed into the contact condenser to absorb heat of the compressed steam to condense the steam.
Make-up water absorbs the waste water waste heat that the evaporimeter came out earlier, then is heated up by industrial waste water secondary, then sprays all the way to in the evaporimeter, and this part temperature is adjusted and can be realized through waste water flow regulation for the secondary heating, and the temperature that sprays in the contact condenser is further controlled by the electric heater in the electric water heating tank, and then can guarantee the stability of system operation condition.
Because the evaporation pressure of water below 100 ℃ is lower than the atmospheric pressure, the system is vacuumized so as to extract non-condensed air in the system and ensure the operation technical requirements of a water vapor compressor, and the vacuum degrees in an evaporator and a contact condenser can be further adjusted in the system operation process. The uncondensed steam in the contact condenser can also bypass to a steam suction port of the compressor, is continuously compressed and then returns to the contact condenser to release heat for condensation. The compressor exhaust steam directly lets in contact condenser bottom, removes the superheat degree with bottom comdenstion water heat transfer earlier and then with the condensation of shower water contact heat transfer, and the setting of packing can increase the area of contact of water and steam, promotes heat exchange efficiency.
In addition, according to the setting of water vapor compressor pressure ratio, can realize different exhaust pressure to the temperature of the high-temperature water of further control condensation satisfies different water supply temperature demands.
Has the advantages that: compared with the prior art, the invention has the following beneficial technical effects:
according to the heat pump system for recovering the waste heat of the industrial wastewater, provided by the invention, natural working medium water is taken as a circulating medium, the water is a high-efficiency and environment-friendly working medium of a high-temperature heat pump system, the temperature requirement of a heat source above 80 ℃ can be realized, the waste heat of the wastewater is further effectively recovered, the energy grade of the waste heat of the wastewater is improved, and the heat supply and heating requirements of wider and wider industrial processes are met; the method is also characterized in that a contact heat exchanger is adopted, spray water is used for condensing compressed water vapor, and irreversible loss and heat transfer efficiency of the condenser are effectively improved; when the quality of the make-up water is guaranteed, the high-temperature hot water generated by the system can meet the requirement of domestic water, the domestic water requirement of factory workers can be met, the cost of an industrial process is further reduced, and the region limitation is reduced; the system control aspect is characterized in that: the temperature of spray water in the evaporator and the temperature of spray water in the contact condenser are adjusted by respectively adopting the second heat exchanger and the electric water heating tank, and the stability of the operation working condition of the system can be ensured by combining the adjustment of the flow of make-up water and the pressure control in the evaporator and the contact condenser.
Drawings
FIG. 1 is a schematic diagram of a system configuration of an embodiment of the present invention;
in the figure: the heat exchanger comprises an evaporator 1, a heat exchange pipe 1a, a spray pipe 1b, a filter screen 1c, a steam compressor 2, a contact condenser 3, a filler 3a, a spray pipe 3b, a filter screen 3c, a first heat exchanger 4, a make-up water pump 5, a second heat exchanger 6, an electric hot water tank 7, a spray water pump 8, a water supply pump 9, a vacuum pump 10, a first regulating valve 11, a second regulating valve 12, a fourth regulating valve 13, a first valve 14, a fifth valve 15, a seventh regulating valve 16, a sixth regulating valve 17, a third regulating valve 18, a third valve 19, a fourth regulating valve 20, a fifth regulating valve 21, a second valve 22 and a sixth valve 23.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
System embodiment
As shown in fig. 1: a high-temperature heat pump system for recovering waste heat of industrial wastewater and taking water as a working medium comprises an evaporator 1, a steam compressor 2, a contact condenser 3, a first heat exchanger 4, a make-up water pump 5, a second heat exchanger 6, an electric water heating tank 7 and a spray water pump 8, wherein a heat exchange tube 1a, a spray tube 1b and a filter screen 1c are arranged in the evaporator 1, the industrial wastewater with the temperature of more than 50 ℃ flows in the heat exchange tube 1a, the spray water 1b is sprayed with the heated make-up water, and the filter screen 1c is used for filtering liquid drops in the steam;
the contact condenser 3 is internally provided with a filler 3a, a spray pipe 3b and a filter screen 3c, the filler 3a is mainly used for increasing the contact area of spray water and water vapor and strengthening heat exchange, the spray pipe 3b sprays make-up water from the electric water heating tank, and the filter screen 3c filters liquid drops in condensed steam in the contact condenser 3;
the steam in the evaporator passes through the filter screen 1c and then is connected with the inlet of the steam compressor 2 through the first valve 14, the low-temperature steam generated in the evaporator 1 is compressed by the steam compressor, the outlet of the steam compressor 2 is connected to the bottom inlet of the contact condenser 3 through the second valve 22, the contact heat exchange between the steam and the bottom water is utilized, the superheat degree of the compressed steam can be reduced or eliminated, the steam with the reduced or eliminated superheat degree continuously flows upwards, the steam is directly contacted with sprayed spray water in the filler 3a for heat exchange and condensation, the elimination of the superheat degree can further reduce the heat transfer temperature difference between the steam and the water in the filler 3a, and the heat transfer efficiency is improved; the industrial wastewater with the temperature of more than 50 ℃ flows out through the first regulating valve 11 after passing through the heat exchange tube 1a and the first heat exchanger 4, the heat emitted by the heat exchange tube 1a enables the spray water sprayed onto the heat exchange tube 1a to be evaporated to generate steam, then the steam continues to enter the first heat exchanger 4, the make-up water is preheated by the first heat exchanger 4, and the heat of the wastewater can be fully recycled; the other path flows out after passing through a second regulating valve 12 and a second heat exchanger 6, and the other path mainly utilizes the waste water waste heat to further heat the make-up water flowing out of the first heat exchanger 4 so as to improve the temperature of the make-up water;
the make-up water is connected to an inlet of a make-up water pump 5 through a first heat exchanger 4 and a third regulating valve 18, an outlet of the make-up water pump 5 is connected to a second heat exchanger 6, an outlet of the make-up water of the second heat exchanger 6 is divided into two paths, one path is connected to a spray pipe 1b through a third valve 19, and the two paths are sprayed into an evaporator 1 through the spray pipe 1b to absorb waste water waste heat to evaporate to generate steam which enters a water vapor compressor 2; the other path is connected to an electric water tank 7 through a fourth regulating valve 20, the electric water tank 7 has the functions of electric heating temperature regulation and a circulating water tank, a hot water outlet of the electric water tank 7 is connected with a spray pipe 3b through a spray water pump 8 and a fifth regulating valve 21, the hot water is sprayed into the contact type condenser 3 through the spray pipe 3b, and the compressed steam flowing from the bottom carries out contact type heat exchange through a filler 3 a;
the top outlets of the evaporator 1 and the contact condenser 3 are respectively connected with a vacuum pump 10 through a fourth valve 13 and a fifth valve 15, before the system is started, the evaporator 1, the contact condenser 3 and a system pipeline can be vacuumized through the vacuum pump 10, non-condensable air is pumped out, and the vacuum degree in the evaporator 1 and the contact condenser 3 can be further adjusted through the vacuum pump in the system operation process;
the hot water outlet of the evaporator 1 is connected to the inlet of the make-up water pump 5 through a sixth regulating valve 17, so that the non-evaporated spray water continuously participates in circulation and is continuously sprayed into the evaporator 1 together with the make-up water for evaporation; the outlet of the contact condenser 3 is connected with a water supply pump 9 through a sixth valve 23, high-temperature hot water with the temperature of more than 80 ℃ at the bottom of the contact condenser 3 is pumped out through the water supply pump 9, and the hot end for supply is used as domestic water or industrial heating.
The steam outlet of the contact condenser 3 is also connected to the inlet of the water vapor compressor 2 through a seventh regulating valve 16, so that the steam generated by the heat absorption and evaporation of the uncondensed steam and the spray water bypasses the air suction pipeline of the water vapor compressor 2, and the uncondensed steam and the spray water are compressed by the water vapor compressor 2 and then continuously return to the contact condenser 3 for condensation and heat release.
Control method embodiment
A control method of a high-temperature heat pump system for recovering waste heat of industrial wastewater by using water as a working medium comprises the following steps:
the method comprises the following steps: opening the second valve 22, the fourth valve 13 and the fifth valve 15, starting the vacuum pump 10 to vacuumize the system, and closing the second valve 22, the fourth valve 13, the fifth valve 15 and the vacuum pump 10 after the vacuum degree meets the requirement; meanwhile, an electric heater in the electric water heating tank 7 is started to heat water in the electric water heating tank 7, and the electric heater in the electric water heating tank 7 is turned off when the water temperature reaches a set value;
step two: opening a first regulating valve 11 and a second regulating valve 12, enabling waste water with the temperature of more than 50 ℃ to enter a heat exchange tube 1a through the first regulating valve 11 in one path, enabling the waste water flowing out of the heat exchange tube 1a to continuously flow into a first heat exchanger 4 for heat release and then to be discharged, and enabling the waste water in the other path to flow into a second heat exchanger 6 for heat release and then to be discharged through the second regulating valve 12; simultaneously opening a third adjusting valve 18, a make-up water pump 5 and a third valve 19, preheating make-up water by a first heat exchanger 4, continuously heating the make-up water in a second heat exchanger 6, spraying the heated make-up water into an evaporator 1 through a spray pipe 1b, and evaporating heat of waste water in an absorption pipe to generate low-temperature steam when the spray water flows through the surface of a heat exchange pipe 1 a;
step three: opening the first valve 14 and the second valve 22, starting the water vapor compressor 2, filtering droplets from the low-temperature water vapor obtained by evaporation in the evaporator 1 by using a filter screen 1c, allowing the low-temperature water vapor to enter the water vapor compressor 2 through the first valve 14 for compression, and allowing the compressed high-temperature water vapor to flow into the bottom inlet of the contact condenser 3 through the second valve 22; simultaneously starting the spray water pump 8 and the fifth regulating valve 21, spraying water in the electric hot water tank 7 into the contact condenser 3 through the spray water pump 8, the fifth regulating valve 21 and the spray pipe 3b, condensing steam through contact heat exchange of the filler 3a and the compressed steam, and storing the sprayed water at the bottom of the contact condenser 3 after absorbing heat and heating and mixing with condensed water;
step four: opening a fourth regulating valve 20 to make part of the make-up water flowing out of the second heat exchanger 6 pass through the fourth regulating valve 20 and be made up into the electric water tank 7, further making the temperature of the inflowing make-up water meet the requirement by using an electric heater in the electric water tank 7, and then spraying the make-up water into the contact condenser 3 to exchange heat with the compressed steam;
step five: opening a seventh regulating valve 16 to enable the uncondensed compressed steam in the contact condenser 3 to return to a steam suction pipeline of the water vapor compressor 2, and continuing to enter the contact condenser 3 for heat release and condensation after being compressed by the water vapor compressor 2;
step six: the unevaporated spray water in the evaporator 1 is accumulated at the bottom of the evaporator 1, when the liquid level reaches a set threshold value, the sixth regulating valve 17 is opened, so that the unevaporated spray water is mixed with the make-up water flowing out of the first heat exchanger 4 and then continuously participates in circulation through the make-up water pump 5; and opening the sixth valve 23 and the water supply pump 9, pumping out the high-temperature water obtained in the contact condenser 3 to be used as a heat source, and meeting the application requirements of heat supply in the industrial process, industrial domestic water and the like.
The first regulating valve 11 is used for regulating the flow of the industrial wastewater with the temperature of more than 50 ℃ entering the heat exchange tube 1a, and the opening degree of the first regulating valve is inversely related to the outlet water temperature of the heat exchange pipeline 1a of the evaporator 1, namely when the outlet water temperature of the heat exchange tube 1a is low, the heat absorption amount of spray water evaporation is increased, and the high-temperature industrial wastewater entering the heat exchange tube 1a needs to be increased; the second regulating valve 12 is used for regulating the temperature of the spraying water sprayed into the evaporator 1, the industrial wastewater with the temperature of more than 50 ℃ is used for further heating the make-up water flowing out of the first heat exchanger 4, then the make-up water is sprayed into the evaporator 1, the opening degree of the second regulating valve 12 is in negative correlation with the temperature of the make-up water flowing out of the second heat exchanger 6, namely the temperature of the make-up water flowing out is increased, which indicates that the flow of the supplied industrial wastewater is larger, the opening degree of the second regulating valve 12 can be reduced, and the industrial wastewater flowing into the second heat exchanger 6 is reduced; in actual work, a make-up water temperature threshold can be set, and when the make-up water temperature threshold is larger than the threshold, the flow of the supplied industrial wastewater is larger;
the third regulating valve 18 is used for regulating the make-up water amount, and the opening degree of the third regulating valve 18 is positively correlated with the steam flow of the steam compressor 2, namely, the larger the compressed steam flow is, the larger the water injection amount which needs to be sprayed into the evaporator 1 for heat absorption and evaporation and the water injection amount which needs to be sprayed into the contact condenser 3 for heat absorption and temperature rise and condensation and compression of steam are, and the opening degree of the third regulating valve 18 needs to be increased to increase the make-up water flow;
the fourth regulating valve 20 is used for regulating the flow of the make-up water entering the electric water tank 7, the opening degree of the fourth regulating valve 20 is inversely related to the liquid level in the electric water tank 7, when the liquid level in the electric water tank 7 is reduced, the amount of the water sprayed into the contact type condenser 3 is increased, and the make-up water amount needs to be increased, so the opening degree of the fourth regulating valve 20 needs to be increased; the fifth regulating valve 21 is used for regulating the flow of spray water in the contact condenser 3, the opening degree of the fifth regulating valve is positively correlated with the water temperature at the bottom of the contact condenser 3, when the flow of the compressed steam is increased, if the water spray quantity in the contact condenser 3 is insufficient, the compressed steam cannot be effectively condensed, the pressure in the contact condenser 3 is increased, the temperature of the condensed water at the bottom and the spray water after heat absorption is increased, the opening degree of the fifth regulating valve 21 needs to be increased, the spray water quantity is increased, and the temperature of the generated hot water is maintained at a set value;
the sixth regulating valve 17 is used for regulating the liquid level in the evaporator 1, and the opening degree of the sixth regulating valve 17 is positively correlated with the liquid level in the evaporator 1, namely when the liquid level in the evaporator 1 rises, the opening degree of the sixth regulating valve 17 is increased, and the system circulating water flow which continuously participates in the spray evaporation together with the make-up water is increased;
the seventh regulating valve 16 is used for regulating the pressure in the contact condenser 3, and the opening degree of the seventh regulating valve 16 is positively correlated with the pressure in the contact condenser 3, that is, when the pressure in the contact condenser increases, which indicates that the amount of uncondensed steam increases, the opening degree of the seventh regulating valve 16 can be increased, the flow rate of the steam bypassing the compressor steam suction port is increased, and the pressure in the contact condenser 3 is maintained at a set value.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a high temperature heat pump system for industrial waste water waste heat recovery is with water as working medium, its characterized in that, this system includes evaporimeter (1), vapor compressor (2), contact condenser (3), first heat exchanger (4), make-up water pump (5), second heat exchanger (6), electric hot water tank (7) and spray water pump (8), establish heat exchange tube (1a), shower (1b), filter screen (1c) in evaporimeter (1), establish filler (3a), shower (3b) and filter screen (3c) in contact condenser (3), the entry of vapor compressor (2) is connected through first valve (14) behind filter screen (1c) in evaporimeter (1), and vapor compressor (2) export connects to the bottom entry of contact condenser (3) through second valve (22), and industrial waste water all the way more than 50 ℃ is through first governing valve (11) through heat exchange tube (1a) and first heat exchanger (1a), filter screen (1c), filter screen (3) are connected to (4) And then flows out, the other path of water flows out after passing through a second regulating valve (12) and a second heat exchanger (6), the make-up water is connected to an inlet of a make-up water pump (5) through a first heat exchanger (4) and a third regulating valve (18), an outlet of the make-up water pump (5) is connected to the second heat exchanger (6), a make-up water outlet of the second heat exchanger (6) is divided into two paths, one path of water is connected to a spray pipe (1b) through a third valve (19), the other path of water is connected to an electric water heating tank (7) through a fourth regulating valve (20), and a hot water outlet of the electric water heating tank (7) is connected with the spray pipe (3b) through a spray water pump (.
2. The high-temperature heat pump system for recovering the waste heat of the industrial wastewater by using water as a working medium according to claim 1, wherein top outlets of the evaporator (1) and the contact condenser (3) are respectively connected with a vacuum pump (10) through a fourth valve (13) and a fifth valve (15) and used for vacuumizing the system or regulating the vacuum degree in the evaporator (1) and the contact condenser (3).
3. The high-temperature heat pump system for recovering the waste heat of the industrial wastewater by using water as a working medium according to claim 2, wherein a hot water outlet of the evaporator (1) is connected to an inlet of the supplementary water pump (5) through a sixth regulating valve (17), so that the water which is not evaporated in the evaporator (1) continuously participates in the system circulation; the outlet of the contact condenser (3) is connected with a water supply pump (9) through a sixth valve (23).
4. The high-temperature heat pump system for recovering the waste heat of the industrial wastewater by using water as a working medium according to claim 3, wherein the steam outlet of the contact condenser (3) is also connected to the inlet of the steam compressor (2) through a seventh regulating valve (16).
5. The method for controlling the high-temperature heat pump system for recovering the waste heat of the industrial wastewater by using water as the working medium according to claim 4, characterized by comprising the following steps of:
the method comprises the following steps: opening a second valve (22), a fourth valve (13) and a fifth valve (15), starting a vacuum pump (10) to vacuumize the system, and closing the second valve (22), the fourth valve (13), the fifth valve (15) and the vacuum pump (10) after the vacuum degree meets the requirement; meanwhile, an electric heater in the electric water heating tank (7) is started to heat water in the electric water heating tank (7), and the electric heater in the electric water heating tank (7) is turned off when the water temperature reaches a set value;
step two: opening a first regulating valve (11) and a second regulating valve (12), enabling waste water with the temperature of more than 50 ℃ to enter a heat exchange pipe (1a) through the first regulating valve (11) on one path, enabling the waste water flowing out of the heat exchange pipe (1a) to continuously flow into a first heat exchanger (4) for heat release and then to be discharged, and enabling the waste water on the other path to flow into a second heat exchanger (6) through the second regulating valve (12) for heat release and then to be discharged; simultaneously opening a third adjusting valve (18), a make-up water pump (5) and a third valve (19), preheating make-up water by a first heat exchanger (4), continuously heating the make-up water in a second heat exchanger (6), spraying the make-up water into an evaporator (1) through a spray pipe (1b), and absorbing heat of wastewater in the heat exchange pipe (1a) to evaporate to generate low-temperature water vapor when the spray water flows through the surface of the heat exchange pipe (1 a);
step three: opening a first valve (14) and a second valve (22), starting a water vapor compressor (2), filtering liquid drops of low-temperature water vapor obtained by evaporation in an evaporator (1) through a filter screen (1c), entering the water vapor compressor (2) through the first valve (14) for compression, and allowing the compressed high-temperature water vapor to flow into a bottom inlet of a contact condenser (3) through the second valve (22); simultaneously starting a spray water pump (8) and a fifth regulating valve (21), spraying water in the electric hot water tank (7) into the contact condenser (3) through the spray water pump (8), the fifth regulating valve (21) and a spray pipe (3b), condensing steam through contact heat exchange of a filler (3a) and compressed steam, and storing the sprayed water which absorbs heat by itself and heats up and condensed water mixed and accumulated at the bottom of the contact condenser (3);
step four: opening a fourth regulating valve (20) to make part of the make-up water flowing out of the second heat exchanger (6) be made up into the electric water tank (7) through the fourth regulating valve (20), and then the temperature of the inflowing make-up water can further reach the requirement by utilizing an electric heater in the electric water tank (7), and then the inflowing make-up water is sprayed into the contact condenser (3) to exchange heat with the compressed steam;
step five: opening a seventh regulating valve (16) to enable the uncondensed compressed steam in the contact condenser (3) to return to a steam suction pipeline of the water vapor compressor (2), and continuing to enter the contact condenser (3) for heat release and condensation after being compressed by the water vapor compressor (2);
step six: the non-evaporated spray water in the evaporator (1) is accumulated at the bottom of the evaporator (1), and when the liquid level in the evaporator (1) reaches a set threshold value, a sixth regulating valve (17) is opened to enable the non-evaporated spray water to be mixed with the make-up water flowing out of the first heat exchanger (4) and then continue to participate in circulation through a make-up water pump (5); and opening a sixth valve (23) and a water supply pump (9), and pumping out the high-temperature water obtained in the contact condenser (3) to be used as a heat source.
6. The control method of the industrial wastewater waste heat recovery high-temperature heat pump system using water as working medium according to claim 5, characterized in that the first regulating valve (11) is used for regulating the flow of the industrial wastewater with the temperature of more than 50 ℃ entering the heat exchange pipe (1a), the opening degree of the first regulating valve is inversely related to the temperature of the outlet water of the heat exchange pipe (1a) of the evaporator (1), the second regulating valve (12) is used for regulating the temperature of the make-up water flowing out of the second heat exchanger (6), and the opening degree of the second regulating valve is inversely related to the temperature of the make-up water flowing out of the second heat exchanger (6).
7. The method for controlling the high-temperature heat pump system using water as working medium for industrial wastewater waste heat recovery according to claim 5 or 6, characterized in that the third regulating valve (18) is used for adjusting the make-up water amount, and the opening degree thereof is positively correlated with the steam flow of the steam compressor (2), i.e. the larger the compressed steam flow is, the larger the water injection amount which needs to be injected into the evaporator (1) for heat absorption and evaporation and the water injection amount which is injected into the contact condenser (3) for heat absorption and temperature rise and condenses the compressed steam is, and the larger the make-up water flow is needed to be increased.
8. The control method of the industrial wastewater waste heat recovery high-temperature heat pump system using water as working medium according to claim 5 or 6, characterized in that the fourth regulating valve (20) is used for regulating the flow of the make-up water entering the electric heating water tank (7), and the opening degree of the fourth regulating valve is inversely related to the liquid level in the electric heating water tank (7); the fifth regulating valve (21) is used for regulating the flow of spray water in the contact condenser (3), and the opening degree of the fifth regulating valve is positively correlated with the water temperature at the bottom of the contact condenser (3).
9. The control method of the high-temperature heat pump system using water as the working medium for industrial wastewater waste heat recovery according to claim 5 or 6, characterized in that the sixth regulating valve (17) is used for regulating the liquid level in the evaporator (1), and the opening degree of the sixth regulating valve is positively correlated to the liquid level in the evaporator (1).
10. The control method of the high-temperature heat pump system for recovering the waste heat of the industrial wastewater by using water as the working medium according to the claim 5 or 6, characterized in that the seventh regulating valve (16) is used for regulating the pressure in the contact condenser (3), and the opening degree of the seventh regulating valve is positively correlated with the pressure in the contact condenser (3).
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| CN110332579B (en) * | 2019-08-05 | 2024-03-08 | 北京华电东晟科技有限公司 | Heat accumulating and supplying system of high-temperature heat pipe heat pump |
| CN112325254B (en) * | 2020-11-06 | 2023-05-09 | 淄博能源研究院 | Steam generator for recovering waste heat of low-temperature tail gas |
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| EP1767257A1 (en) * | 2005-09-22 | 2007-03-28 | Vlaamse Instelling Voor Technologisch Onderzoek (Vito) | Installation for the treatment of liquid |
| JP2010133696A (en) * | 2008-11-06 | 2010-06-17 | Kobe Steel Ltd | Vapor compression device |
| CN204574237U (en) * | 2015-04-03 | 2015-08-19 | 山西文龙煤矿工程设计有限公司 | A kind of system of publilc baths waste water reuse |
| KR20160133762A (en) * | 2015-05-13 | 2016-11-23 | 한밭대학교 산학협력단 | Steam storing and steam compressing device for waste heat boiler |
| CN106439766A (en) * | 2016-09-30 | 2017-02-22 | 中能服能源科技股份有限公司 | Steam production device and direct compression type heat pump system |
| CN206130947U (en) * | 2016-09-30 | 2017-04-26 | 中能服能源科技股份有限公司 | Steam making devices and direct compression formula heat pump system |
| CN206787320U (en) * | 2016-12-22 | 2017-12-22 | 北京瑞宝利热能科技有限公司 | A kind of negative pressure cools down steam compression heat pump and its system certainly |
| CN206609156U (en) * | 2017-02-22 | 2017-11-03 | 北京瑞宝利热能科技有限公司 | A kind of oil field reinjection water heat pump of recovering residual heat unit and its system |
| CN106986358A (en) * | 2017-04-13 | 2017-07-28 | 安徽广信农化股份有限公司 | A kind of purifying technique of pyraclostrobin by-product sodium sulphate |
| CN107192171B (en) * | 2017-06-14 | 2019-07-16 | 江苏科技大学 | A kind of cascade recovery system and recovery method of industrial wastewater waste heat |
| CN107461961B (en) * | 2017-07-28 | 2019-09-27 | 江苏科技大学 | A kind of the double flash evaporation two stages of compression formula heat pump assembly and working method of double heat sources |
| CN207581566U (en) * | 2017-11-21 | 2018-07-06 | 重庆运城制版有限公司 | A kind of waste water high-efficiency processing system |
| CN108592444B (en) * | 2018-02-06 | 2023-10-31 | 华北电力大学 | Heat exchange unit combining electric heat pump and absorption heat pump |
| CN109114829A (en) * | 2018-08-09 | 2019-01-01 | 宁夏欣达节能技术有限公司 | Sewage treatment plant's low temperature exhaust heat recycling and reusing system and method |
| CN109611167A (en) * | 2018-11-23 | 2019-04-12 | 华北电力大学（保定） | Recycle method, apparatus, equipment, system and the storage medium of low temperature exhaust heat steam |
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