CN114427761A - Energy-saving low-carbon sewage source heat pump system utilizing low-grade heat in sewage - Google Patents
Energy-saving low-carbon sewage source heat pump system utilizing low-grade heat in sewage Download PDFInfo
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- CN114427761A CN114427761A CN202210213734.2A CN202210213734A CN114427761A CN 114427761 A CN114427761 A CN 114427761A CN 202210213734 A CN202210213734 A CN 202210213734A CN 114427761 A CN114427761 A CN 114427761A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/04—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being spirally coiled
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
Abstract
The invention discloses an energy-saving low-carbon sewage source heat pump system utilizing low-grade heat in sewage, which comprises: the self-cleaning heat exchange coil assembly is arranged in a sewage outlet tank of a sewage treatment plant; the self-cleaning type heat exchange coil assembly is respectively connected with an evaporator and a condenser of the heat pump subsystem through a control pipe network subsystem, and can respectively form an evaporation heat exchange circulation loop with the evaporator and a condensation heat exchange circulation loop with the condenser; the tail end heat exchange subsystem is respectively connected with an evaporator and a condenser of the heat pump subsystem through the control pipe network subsystem, and can respectively form an evaporation heat exchange circulation loop with the evaporator and a condensation heat exchange circulation loop with the condenser. The system utilizes effluent of the sewage plant, directly exchanges heat in the effluent pool of the sewage plant through the self-cleaning heat exchange coil assembly, can fully utilize sewage heat to realize heating and refrigerating, cancels equipment such as a first-level sewage delivery pump, sewage filtering equipment and a first-level heat exchange, and improves energy efficiency.
Description
Technical Field
The invention relates to the field of sewage treatment and energy recycling, in particular to a system of an energy-saving low-carbon sewage source heat pump system.
Background
The principle of the water source heat pump technology is that low-grade heat energy resources contained in a water source are converted into utilizable high-grade heat energy by inputting a small amount of electric energy. The mode is most in line with the principles of heat source temperature matching, energy gradient utilization and energy conservation and low carbon, and the water source heat pump heating is the key point of the research on energy development of all countries in the world at present.
Compared with other energy sources, the urban sewage treated by the sewage treatment plant is an unavailable heat pump cold and heat source. The water quality and temperature of the water-saving heat pump are relatively stable throughout the year, the water yield is high, the temperature throughout the year is 10-25 ℃, and the temperature is 10-18 ℃ above in a severe cold area in winter (for example, the temperature of Harbin is about 10 ℃), so that the water-saving heat pump is a rich heat source; the temperature of 20-25 ℃ in summer is an ideal discharge place of the waste heat of the air conditioner. The sewage source heat pump technology can fully utilize the low-grade heat energy of the urban sewage, is evolved from a relatively mature geothermal water source heat pump technology, takes the urban sewage as a cold and heat source for extracting and storing energy, consumes a small amount of electric energy by virtue of a sewage source heat pump compressor system, extracts the low-grade heat energy stored in the sewage to supply heat for users, and can also extract indoor heat to be released into the sewage, thereby reducing the room temperature and achieving the refrigeration effect.
The existing commonly used sewage source heat pump system is complex, heat exchange is directly carried out at a sewage collecting station in the early stage for the purpose of heat exchange convenience and more temperature difference exchange, but untreated sewage has more impurities, and better pretreatment measures such as grating, sand setting, filtering and the like are needed to isolate pollutants and avoid pollution blockage of the heat pump system; later development needs heat exchange after sewage treatment, and heat supply and refrigeration are carried out on sewage plants or the periphery, and the heat exchange water source is obviously clean, but pretreatment systems such as filtration are still needed. The heat exchange of the sewage is indirect regardless of the sewage which is not treated or is properly treated, and mainly aims to avoid pollution blockage, corrosion and the like on a sewage source heat pump system. However, the heat loss of the indirect heat exchange is large, and the heat exchange efficiency is not high. Meanwhile, a primary lifting pump and pretreatment equipment are added for indirect heat exchange, and the overall energy consumption and the manufacturing cost of the system are also increased.
Besides, the inventor finds that in practical application, the existing sewage source heat pump at least has the following problems:
(1) the problem of limitation of available water source conditions.
The sewage source heat pump system needs to have available sewage resources meeting certain conditions of water quality, temperature and water quantity, so that whether a proper water source can be found in actual engineering becomes a limiting condition for using the sewage source heat pump.
(2) Blockage, pollution, corrosion and the like.
Because the sewage contains more impurities and the components of the sewage are uncertain, the selection of the material of the sewage source heat pump system is a very key factor, at present, the sewage is not used to directly enter the heat pump to work, but the sewage is firstly subjected to heat exchange by the sewage heat exchanger and then is subjected to work by the heat pump, so that the process of indirect heat supply and heat supply is realized.
(3) A pretreatment facility.
Since the sewage contains many impurities and its composition is uncertain, how to reduce the pollutants by the pretreatment facilities is a problem to be solved.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an energy-saving low-carbon sewage source heat pump system utilizing low-grade heat in sewage, which can fully extract low-grade heat energy in the sewage, save a large amount of electric energy consumed by refrigeration and heating, further reduce carbon dioxide emission and further solve the technical problems in the prior art.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides an energy-saving low-carbon sewage source heat pump system utilizing low-grade heat in sewage, which comprises:
self-cleaning formula heat exchange coil subassembly, control pipe network subsystem, heat pump subsystem and terminal heat exchange subsystem: wherein, the first and the second end of the pipe are connected with each other,
the self-cleaning heat exchange coil assembly is arranged in a sewage outlet tank of a sewage treatment plant;
the self-cleaning type heat exchange coil assembly is respectively connected with an evaporator and a condenser of the heat pump subsystem through the control pipe network subsystem, and can respectively form an evaporation heat exchange circulation loop with the evaporator and a condensation heat exchange circulation loop with the condenser;
the tail end heat exchange subsystem is respectively connected with an evaporator and a condenser of the heat pump subsystem through the control pipe network subsystem, and can respectively form an evaporation heat exchange circulation loop with the evaporator and a condensation heat exchange circulation loop with the condenser.
Compared with the prior art, the energy-saving low-carbon sewage source heat pump system utilizing low-grade heat in sewage provided by the invention has the beneficial effects that:
the sewage treatment system has the advantages that the sewage treatment plant effluent is utilized, heat is directly exchanged in the sewage effluent pool of the sewage treatment plant through the self-cleaning heat exchange coil assembly, a primary sewage delivery pump, sewage filtering equipment, primary heat exchange equipment and the like are omitted, and the energy efficiency is improved; compared with the traditional petrochemical energy, the sewage source heat pump system has the characteristics of low carbon emission, higher energy efficiency ratio, energy conservation, economy, cleanness, no pollution and the like; the energy-saving air conditioner saves 50% of energy compared with an oil-fired boiler and 30% of energy compared with an air conditioner, can supply heat and refrigeration, can also provide domestic hot water, has multiple purposes, is not influenced by weather, and is stable in operation; can be used for heating, cooling and heating water for sewage plants, surrounding districts, commercial buildings, industrial and agricultural buildings and the like, and is a clean, environment-friendly, green, low-carbon, economic and efficient energy supply mode.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating an energy-saving low-carbon sewage source heat pump system for utilizing low-grade heat in sewage according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a sewage source heat pump in a heat supply mode of the energy-saving low-carbon sewage source heat pump system according to the embodiment of the invention;
fig. 3 is a schematic diagram of a sewage source heat pump in a refrigeration mode of an energy-saving low-carbon sewage source heat pump system according to an embodiment of the present invention;
in the figure: 1-a self cleaning heat exchange coil assembly; 11-a heat exchange coil; 12-water outlet pipeline; 13-a water inlet pipeline; 14-a lift pump; 15-liquid heat exchange medium supplement pipeline; 16-disc flushing perforated pipes; 17-flushing the line; 18-high pressure flush pump; 2-controlling the pipe network subsystem; 21-a first control line; 22-a first control line; 23-a second control line; 24-a third control line; 3-a heat pump subsystem; 31-a compressor; 32-an evaporator; 33-a condenser; 34-an expansion valve; 4-terminal heat exchange subsystem; 41-heat exchange equipment; 42-a water outlet pipe; 43-a water inlet pipe; 44-an outer screen water collector; 45-outer net water separator; 46-a medium water replenishing path; 5-a sewage outlet pool; 51-a sewage inlet; 52-Sewage outlet.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely described below by combining the specific content of the invention; it is to be understood that the described embodiments are merely exemplary of the invention, and are not intended to limit the invention to the particular forms disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The terms that may be used herein are first described as follows:
the term "and/or" means that either or both can be achieved, for example, X and/or Y means that both cases include "X" or "Y" as well as three cases including "X and Y".
The terms "comprising," "including," "containing," "having," or other similar terms of meaning should be construed as non-exclusive inclusions. For example: including a feature (e.g., material, component, ingredient, carrier, formulation, material, dimension, part, component, mechanism, device, process, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product, or article of manufacture), is to be construed as including not only the particular feature explicitly listed but also other features not explicitly listed as such which are known in the art.
The term "consisting of … …" is meant to exclude any technical feature elements not explicitly listed. If used in a claim, the term shall render the claim closed except for the inclusion of the technical features that are expressly listed except for the conventional impurities associated therewith. If the term occurs in only one clause of the claims, it is defined only as specifically listed in that clause, and elements recited in other clauses are not excluded from the overall claims.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured," etc., are to be construed broadly, as for example: can be fixedly connected, can also be detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms herein can be understood by those of ordinary skill in the art as appropriate.
When concentrations, temperatures, pressures, dimensions, or other parameters are expressed as ranges of values, the ranges are to be understood as specifically disclosing all ranges formed from any pair of upper, lower, and preferred values within the range, regardless of whether ranges are explicitly recited; for example, if a numerical range of "2 ~ 8" is recited, then the numerical range should be interpreted to include ranges of "2 ~ 7", "2 ~ 6", "5 ~ 7", "3 ~ 4 and 6 ~ 7", "3 ~ 5 and 7", "2 and 5 ~ 7", and the like. Unless otherwise indicated, the numerical ranges recited herein include both the endpoints thereof and all integers and fractions within the numerical range.
The terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship that is indicated based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description only, and are not intended to imply or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting herein.
The energy-saving low-carbon sewage source heat pump system utilizing low-grade heat in sewage provided by the invention is described in detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art. Those not specifically mentioned in the examples of the present invention were carried out according to the conventional conditions in the art or conditions suggested by the manufacturer. The reagents or instruments used in the examples of the present invention are not specified by manufacturers, and are all conventional products available by commercial purchase.
As shown in fig. 1, an embodiment of the present invention provides an energy-saving low-carbon sewage source heat pump system using low-grade heat in sewage, including:
self-cleaning formula heat exchange coil subassembly, control pipe network subsystem, heat pump subsystem and terminal heat exchange subsystem: wherein the content of the first and second substances,
the self-cleaning heat exchange coil assembly is arranged in a sewage outlet tank of a sewage treatment plant;
the self-cleaning type heat exchange coil assembly is respectively connected with an evaporator and a condenser of the heat pump subsystem through the control pipe network subsystem, and can respectively form an evaporation heat exchange circulation loop with the evaporator and a condensation heat exchange circulation loop with the condenser;
the tail end heat exchange subsystem is respectively connected with an evaporator and a condenser of the heat pump subsystem through the control pipe network subsystem, and can respectively form an evaporation heat exchange circulation loop with the evaporator and a condensation heat exchange circulation loop with the condenser.
In the sewage source heat pump system, the control pipe network subsystem consists of a first control pipeline component and a second control pipeline component; wherein the content of the first and second substances,
one end of the first control pipeline assembly is a first water inlet port, and the first water inlet port is connected with the water outlet end of the self-cleaning heat exchange coil assembly;
the other end of the first control pipeline assembly is a second water inlet port, and the first water inlet port is connected with the water outlet end of the tail end heat exchange subsystem;
one end of the control pipeline component II is a third water outlet port, and the third water outlet port is connected with the water inlet end of the self-cleaning type heat exchange coil component;
the other end of the second control pipeline assembly is a fourth water outlet port, and the fourth water outlet port is connected with the water inlet end of the tail end heat exchange subsystem;
the first control pipeline assembly consists of a first control pipeline and a second control pipeline which are arranged in parallel, and two control valves are respectively arranged at two ends of the first control pipeline and the second control pipeline; specifically, the two control valves of the first control pipeline are respectively a valve a1 and a valve B1, the control valve on the side of the first water inlet port is a valve B1, and the control valve on the side of the second water inlet port is a valve a 1; the two control valves of the second control pipeline are respectively a valve A2 and a valve B2, the control valve at one side of the first water inlet port is a valve A2, and the control valve at one side of the second water inlet port is a valve B2;
the second control pipeline assembly consists of a third control pipeline and a fourth control pipeline which are arranged in parallel, and two ends of the third control pipeline and the fourth control pipeline are respectively provided with a control valve; specifically, the two control valves of the third control line are valve A3 and valve B3, respectively, the control valve on the third water outlet port side is valve A3, and the control valve on the fourth water outlet port side is valve B3; the two control valves of the fourth control pipeline are respectively a valve A4 and a valve B4, the control valve at the side of the third water inlet port is a valve B4, and the control valve at the side of the fourth water inlet port is a valve A4;
an evaporator inlet is arranged between the two control valves on the second control pipeline, and the evaporator inlet is connected with an inlet of the evaporator through a pipeline;
an evaporator return port is arranged between the two control valves on the third control pipeline and is connected with an outlet of the evaporator through a pipeline;
a condenser inlet is arranged between the two control valves on the first control pipeline, and the condenser inlet is connected with an inlet of the condenser through a pipeline;
and a condenser return port is arranged between the two control valves on the fourth control pipeline and is connected with the return port of the condenser through a pipeline.
According to the control pipe network subsystem with the structure, the control valves on different control pipelines are controlled to be opened and closed, so that the evaporator and the condenser can be exchanged to be connected, the heating and refrigerating modes of the whole sewage source heat pump system are changed, and the system is particularly convenient to switch between different working modes.
In the above sewage source heat pump system, the self-cleaning heat exchange coil assembly includes:
the device comprises a heat exchange coil, a lifting pump, a water outlet pipeline, a water inlet pipeline and a self-cleaning component;
the heat exchange coil is arranged in a sewage outlet tank of the sewage treatment plant;
the water outlet of the heat exchange coil is connected with a first water inlet port of the control pipe network subsystem through a water outlet pipeline of the lifting pump;
the water inlet of the heat exchange coil is connected with the first water outlet port of the control pipe network subsystem through the water inlet pipeline;
and liquid heat exchange media are filled in the heat exchange coil, the water outlet pipeline and the water inlet pipeline. Preferably, the liquid heat exchange medium adopts water;
the self-cleaning component is arranged above the heat exchange coil, the cleaning through hole faces the surface of the heat exchange coil, and the water inlet end of the self-cleaning component is communicated with the water outlet tank of the sewage plant.
Because the self-cleaning heat exchange coil assembly which takes intermediate water as a liquid heat exchange medium is arranged in a water outlet pool of a sewage plant, the heat exchange with sewage can be directly carried out, the heat exchange area is larger, the efficiency is higher, and sewage does not enter the heat pump subsystem and is isolated from the inside of the heat pump subsystem. In addition, because the self-cleaning type heat exchange coil assembly capable of self-cleaning is adopted, the high-pressure automatic cleaning can be directly carried out in the sewage outlet pool, the problems of pollution, outer surface scaling, corrosion and the like of the heat exchange coil are reduced, and the heat exchange efficiency is further improved.
In the above sewage source heat pump system, the self-cleaning heat exchange coil assembly further includes: and the liquid heat exchange medium supplementing pipeline is connected with the water outlet pipeline.
The self-cleaning assembly described above comprises: the device comprises a disc type flushing perforated pipe, a high-pressure flushing pump and a flushing pipeline; wherein the content of the first and second substances,
the disc type washing perforated pipe is arranged above the heat exchange coil pipe, a plurality of washing through holes are formed in the bottom of the disc type washing perforated pipe, each washing through hole faces the surface of the heat exchange coil pipe, and the washing range of the disc type washing perforated pipe is matched with the area of the whole heat exchange coil pipe;
the disc type flushing perforated pipe is communicated with a flushing pipeline provided with the high-pressure flushing pump, and the other end of the flushing pipeline is communicated with the inside of the water outlet tank of the sewage plant.
The disc type flushing perforated pipe, the high-pressure flushing pump and the flushing pipeline form a self-cleaning system of the self-cleaning type heat exchange coil assembly, and the reclaimed water in a water outlet pool of a sewage plant is used as a high-pressure flushing water source. The disk type washing perforated pipe is located 15-20 cm above the heat exchange coil, the bottom of the disk type washing perforated pipe is perforated, and when the washing water pump is started, high-pressure water can be sprayed out through perforation, so that the following heat exchange coil is directly washed and cleaned, and the heat exchange efficiency is kept. The flow of the high-pressure flushing pump is determined according to the area of the heat exchange coil pipe to be flushed, the flushing pipe diameter, the number of the through holes and the arrangement form are designed and determined according to the heat exchange area, the distance and the flow of the high-pressure pump, and the flushing pressure of the through holes is generally not lower than 5MPa and not higher than 10 MPa. The underwater flushing perforated pipe road material can adopt SS304 stainless steel grade and above. The high-pressure flushing pump is started through automatic control, flushing is automatically set once per week, flushing time is 5min each time, and a flushing period and flushing times can be adjusted and set according to needs.
In the above sewage source heat pump system, the heat pump subsystem includes:
a compressor, an expansion valve, a pipeline, the evaporator and the condenser; wherein the content of the first and second substances,
the compressor is sequentially connected with the condenser, the expansion valve and the evaporator through pipelines to form a loop structure;
the pipeline is filled with a refrigerant.
The falling film evaporator can improve the heat exchange efficiency; compared with a flooded heat exchanger, the efficiency is improved by more than 20%; compared with the conventional sewage source heat pump, the total efficiency is improved by 15%, the energy consumption is reduced by 10%, and the operation effect is excellent.
Among the above-mentioned sewage source heat pump system, terminal heat transfer subsystem includes:
the heat exchange device, the circulating water pump, the water inlet pipe and the water outlet pipe; wherein the content of the first and second substances,
the heat exchange equipment is provided with a water inlet and a water outlet respectively, the water inlet is connected with a fourth water outlet port of the control pipe network subsystem through a water supply pipe, and the water outlet is connected with a second water inlet port of the control pipe network subsystem through a water outlet pipe.
In the terminal heat exchange subsystem, the heat exchange equipment is at least one of a radiator, a fan coil and floor auxiliary heat.
In the above terminal heat exchange subsystem, the terminal heat exchange subsystem further includes:
an outer net water collector and an outer net water separator; wherein the content of the first and second substances,
the outer net water collector is connected between the water inlet pipe and a second water inlet port of the control pipe network subsystem;
and the outer network water separator is connected between a fourth water outlet port of the control pipe network subsystem and the water inlet pipe.
The terminal heat exchange subsystem further comprises: and the intermediate water replenishing pipe is connected with the water outlet pipe.
The sewage source heat pump system can work in different modes according to needs, and comprises:
the discharge temperature (namely the water temperature of a water outlet tank of a sewage plant) of the secondary sedimentation tank of the urban sewage treatment plant varies with the geographical latitude, generally 8-20 ℃ in winter and 23-28 ℃ in summer.
Referring to fig. 1, during heating in winter, the sewage source heat pump system is in a heating mode, at this time, a valve a2 of a second control pipeline of a first control pipeline component of a control pipeline sub-system is opened, a valve B2 is closed, a valve A3 of a third control pipeline of a second control pipeline component of the control pipeline component is opened, and a valve B3 is closed, so that the self-cleaning heat exchange coil component and an evaporator of the heat pump sub-system are connected to form an evaporation heat exchange circulation loop;
and the valve A1 of the first control pipeline assembly is opened, the valve B1 is closed, the valve A4 of the fourth control pipeline of the second control pipeline assembly is opened, and the valve B4 is closed, so that the tail end heat exchange subsystem and the condenser of the heat pump subsystem are connected to form a condensation heat exchange circulation loop. The system operating in heating mode is connected as shown in fig. 2;
referring to fig. 2, in the heat supply process, the self-cleaning heat exchange coil assembly placed in the effluent pool of the sewage plant directly exchanges heat with sewage, extracts heat in the sewage to intermediate water in the self-cleaning heat exchange coil assembly, enters an evaporator of the heat pump subsystem through circulation lifting, transfers the heat to a refrigerant in a low-temperature and low-pressure liquid form, the refrigerant is compressed by a compressor to be in a high-temperature and high-pressure gaseous form, releases the heat to a circulating water system through a condenser, supplies heat to users through a terminal heat exchange subsystem, and the high-pressure gaseous refrigerant is changed into a low-pressure liquid state through an expansion valve, absorbs the heat from the evaporator again, and circulates; specifically, during the heat supply operation in winter, the water in the water outlet pool of the sewage plant exchanges heat with the intermediate water in the coil pipe arranged in the water outlet pool, the intermediate water is lifted by the lifting pump and flows through the evaporator of the heat pump subsystem in a pressurized manner, and the enthalpy of the waste water in the evaporator is evaporated and absorbed by the low-temperature liquid working medium entering the evaporator; and (4) cooling the reclaimed water by 1-3 ℃ and then discharging. The low-temperature working medium gas vaporized in the evaporator enters a compressor through an air suction pipe, becomes high-temperature high-pressure working medium hot gas after adiabatic compression, enters a condenser of a heat pump through an exhaust pipe, in the condenser, the temperature of the vaporization latent heat absorbing high-temperature high-pressure working medium gas rises to 45-55 ℃ through the backwater of a tail end heat exchange subsystem (a heating and/or air conditioning system), then heat is supplied to a user, the high-temperature working medium gas is condensed into liquid, and enters the evaporator after throttling, the process is repeated, and the heat in the waste water is continuously absorbed.
Referring to fig. 1, during refrigeration in summer, the sewage source heat pump system is in a refrigeration mode, at this time, a valve B2 of a second control pipeline of a first control pipeline component of a control pipeline sub-system is opened, a valve a2 is closed, a valve B3 of a third control pipeline of a second control pipeline component is opened, and a valve A3 is closed, so that the tail end heat exchange sub-system and an evaporator of the heat pump sub-system are connected to form an evaporation heat exchange circulation loop;
and the valve B1 of the first control pipeline assembly is opened, the valve A1 is closed, the valve B4 of the fourth control pipeline of the second control pipeline assembly is opened, and the valve A4 is closed, so that the tail end heat exchange subsystem and the condenser of the heat pump subsystem are connected into a condensation heat exchange circulation loop. The system connection for operating in the cooling mode is shown in fig. 3;
referring to fig. 3, in the refrigeration process, the terminal heat exchange subsystem absorbs indoor heat into the circulating water, the refrigerant is transferred to the low-temperature low-pressure liquid form through the evaporator, the refrigerant is compressed by the compressor to become a high-temperature high-pressure gaseous form, the heat is released into the intermediate water through the condenser, and the heat is directly released into the sewage through the self-cleaning heat exchange coil assembly in the sewage outlet pool, so that refrigeration for users is realized, the high-pressure gaseous refrigerant is changed into a low-pressure liquid form through the expansion valve, the heat is absorbed from the evaporator again, and the cycle is performed; specifically, in the cooling mode: high-temperature high-pressure refrigerant gas enters the condenser from the compressor to form high-temperature high-pressure liquid, heat is released from intermediate water in the condenser, and the intermediate water releases heat into low-temperature heat source water (sewage) through a self-cleaning type heat exchange coil assembly connected with an evaporator in a water outlet pool of a sewage plant, so that the temperature of cooling water (sewage) is raised. The refrigerant is expanded into low-temperature and low-pressure liquid through the expansion valve, enters the evaporator to absorb the heat in the chilled water, is evaporated into low-pressure steam, and lowers the temperature of the chilled water. The low pressure refrigerant vapor is compressed into high temperature and high pressure gas in the compressor. The chilled water obtained in the evaporator is circulated in such a way and is supplied to the tail end heat exchange subsystem.
Compared with the traditional petrochemical energy, the sewage source heat pump system improves the heat exchange efficiency through the heat pump subsystem (namely the sewage source heat pump), and saves a large amount of electric energy consumed by refrigeration and heating, thereby reducing the emission of carbon dioxide and reducing the cost of electricity charge. Meanwhile, heating and heat supply benefits are increased for the sewage plant, and environmental benefits and economic benefits are obtained; the method has the characteristics of low carbon emission, higher energy efficiency ratio, more energy conservation, more economy, cleanness, no pollution and the like; the energy-saving air conditioner saves 50% of energy compared with an oil-fired boiler and 30% of energy compared with an air conditioner, can supply heat and refrigeration, can also provide domestic hot water, has multiple purposes, is not influenced by weather, and is stable in operation; can be used for heating, cooling and heating water for sewage plants, surrounding districts, commercial buildings, industrial and agricultural buildings and the like, and is a clean, environment-friendly, green, low-carbon, economic and efficient energy supply mode.
If the heat pump subsystem uses a high-temperature heat pump series, the high-temperature effluent with the effluent temperature being increased to about 80 ℃ can be used for heating sludge and the like;
the sewage source heat pump system utilizes urban sewage as a cold and heat source to perform energy conversion, and has multiple remarkable advantages of high efficiency, energy conservation, remarkable environment-friendly effect, development and utilization of renewable clean energy and the like. In addition, the sewage source heat pump can provide domestic hot water all the year round, really achieves multiple purposes, has very wide prospect, realizes sewage treatment which needs to consume a large amount of energy, is transformed from a large energy consumption user to a capacity generating unit, realizes energy conservation and consumption reduction, and reduces the emission of indirect carbon.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (10)
1. An energy-saving low-carbon type sewage source heat pump system using low-grade heat in sewage is characterized by comprising:
self-cleaning formula heat exchange coil subassembly, control pipe network subsystem, heat pump subsystem and terminal heat exchange subsystem: wherein the content of the first and second substances,
the self-cleaning heat exchange coil assembly is arranged in a sewage outlet tank of a sewage treatment plant;
the self-cleaning type heat exchange coil assembly is respectively connected with an evaporator and a condenser of the heat pump subsystem through the control pipe network subsystem, and can respectively form an evaporation heat exchange circulation loop with the evaporator and a condensation heat exchange circulation loop with the condenser;
the tail end heat exchange subsystem is respectively connected with an evaporator and a condenser of the heat pump subsystem through the control pipe network subsystem, and can respectively form an evaporation heat exchange circulation loop with the evaporator and a condensation heat exchange circulation loop with the condenser.
2. The energy-saving low-carbon sewage source heat pump system utilizing the low-grade heat in the sewage as claimed in claim 1, wherein the control pipe network subsystem is composed of a first control pipeline component and a second control pipeline component; wherein the content of the first and second substances,
one end of the first control pipeline assembly is a first water inlet port, and the first water inlet port is connected with the water outlet end of the self-cleaning heat exchange coil assembly;
the other end of the first control pipeline assembly is a second water inlet port, and the first water inlet port is connected with the water outlet end of the tail end heat exchange subsystem;
one end of the control pipeline component II is a third water outlet port, and the third water outlet port is connected with the water inlet end of the self-cleaning type heat exchange coil component;
the other end of the second control pipeline assembly is a fourth water outlet port, and the fourth water outlet port is connected with the water inlet end of the tail end heat exchange subsystem;
the first control pipeline assembly consists of a first control pipeline and a second control pipeline which are arranged in parallel, and two ends of the first control pipeline and the second control pipeline are respectively provided with a control valve;
the second control pipeline assembly consists of a third control pipeline and a fourth control pipeline which are arranged in parallel, and two ends of the third control pipeline and the fourth control pipeline are respectively provided with a control valve;
an evaporator inlet is arranged between the two control valves on the second control pipeline, and the evaporator inlet is connected with an inlet of the evaporator through a pipeline;
an evaporator return port is arranged between the two control valves on the third control pipeline and is connected with an outlet of the evaporator through a pipeline;
a condenser inlet is arranged between the two control valves on the first control pipeline, and the condenser inlet is connected with an inlet of the condenser through a pipeline;
and a condenser return port is arranged between the two control valves on the fourth control pipeline and is connected with the return port of the condenser through a pipeline.
3. The energy-saving low-carbon sewage source heat pump system using low-grade heat in sewage according to claim 1 or 2, wherein the self-cleaning heat exchange coil assembly comprises:
the device comprises a heat exchange coil, a lifting pump, a water outlet pipeline, a water inlet pipeline and a self-cleaning component;
the heat exchange coil is arranged in a sewage outlet tank of the sewage treatment plant;
the water outlet of the heat exchange coil is connected with a first water inlet port of the control pipe network subsystem through a water outlet pipeline of the lifting pump;
the water inlet of the heat exchange coil is connected with the first water outlet port of the control pipe network subsystem through the water inlet pipeline;
liquid heat exchange media are filled in the heat exchange coil, the water outlet pipeline and the water inlet pipeline;
the self-cleaning component is arranged above the heat exchange coil, the cleaning through hole faces the surface of the heat exchange coil, and the water inlet end of the self-cleaning component is communicated with the water outlet tank of the sewage plant.
4. The energy-saving low-carbon sewage source heat pump system using low-grade heat in sewage as claimed in claim 3, wherein the self-cleaning heat exchange coil assembly further comprises:
the liquid heat exchange medium supplementing pipeline is connected with the water outlet pipeline;
the self-cleaning assembly comprises: the device comprises a disc type flushing perforated pipe, a high-pressure flushing pump and a flushing pipeline; wherein the content of the first and second substances,
the disc type washing perforated pipe is arranged above the heat exchange coil pipe, a plurality of washing through holes are formed in the bottom of the disc type washing perforated pipe, and each washing through hole faces the surface of the heat exchange coil pipe;
the disc type flushing perforated pipe is communicated with a flushing pipeline provided with the high-pressure flushing pump, and the other end of the flushing pipeline is communicated with the inside of the water outlet tank of the sewage plant.
5. The energy-saving low-carbon sewage source heat pump system using low-grade heat in sewage according to claim 1 or 2, wherein the heat pump subsystem comprises:
a compressor, an expansion valve, a pipeline, the evaporator and the condenser; wherein, the first and the second end of the pipe are connected with each other,
the compressor is sequentially connected with the condenser, the expansion valve and the evaporator through pipelines to form a loop structure;
the pipeline is filled with a refrigerant.
6. The energy-saving low-carbon sewage source heat pump system using low-grade heat in sewage as claimed in claim 1 or 2, wherein the evaporator is a falling film evaporator.
7. The energy-saving low-carbon sewage source heat pump system using low-grade heat in sewage according to claim 1 or 2, wherein the terminal heat exchange subsystem comprises:
the heat exchange device, the circulating water pump, the water inlet pipe and the water outlet pipe; wherein the content of the first and second substances,
the heat exchange equipment is provided with a water inlet and a water outlet respectively, the water inlet is connected with a fourth water outlet port of the control pipe network subsystem through a water supply pipe, and the water outlet is connected with a second water inlet port of the control pipe network subsystem through a water outlet pipe.
8. The energy-saving low-carbon sewage source heat pump system using low-grade heat in sewage according to claim 7, wherein the heat exchange device is at least one of a radiator, a fan coil and floor auxiliary heat.
9. The energy-saving low-carbon sewage source heat pump system using low-grade heat in sewage according to claim 7, wherein the terminal heat exchange subsystem further comprises:
an outer net water collector and an outer net water separator; wherein the content of the first and second substances,
the outer net water collector is connected between the water inlet pipe and a second water inlet port of the control pipe network subsystem;
and the outer network water separator is connected between a fourth water outlet port of the control pipe network subsystem and the water inlet pipe.
10. The energy-saving low-carbon sewage source heat pump system using low-grade heat in sewage according to claim 7, wherein the terminal heat exchange subsystem further comprises:
and the intermediate water replenishing pipe is connected with the water outlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210213734.2A CN114427761A (en) | 2022-03-04 | 2022-03-04 | Energy-saving low-carbon sewage source heat pump system utilizing low-grade heat in sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210213734.2A CN114427761A (en) | 2022-03-04 | 2022-03-04 | Energy-saving low-carbon sewage source heat pump system utilizing low-grade heat in sewage |
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| CN114427761A true CN114427761A (en) | 2022-05-03 |
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|---|---|---|---|
| CN202210213734.2A Pending CN114427761A (en) | 2022-03-04 | 2022-03-04 | Energy-saving low-carbon sewage source heat pump system utilizing low-grade heat in sewage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234964A (en) * | 2022-07-27 | 2022-10-25 | 中国建筑西北设计研究院有限公司 | Sewage source heat pump simulation heating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234964A (en) * | 2022-07-27 | 2022-10-25 | 中国建筑西北设计研究院有限公司 | Sewage source heat pump simulation heating system |
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