CN113686021A - Device and method for heating and controlling temperature of sewage inlet water by adopting air-source heat pump - Google Patents
Device and method for heating and controlling temperature of sewage inlet water by adopting air-source heat pump Download PDFInfo
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- CN113686021A CN113686021A CN202110967650.3A CN202110967650A CN113686021A CN 113686021 A CN113686021 A CN 113686021A CN 202110967650 A CN202110967650 A CN 202110967650A CN 113686021 A CN113686021 A CN 113686021A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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Abstract
The invention provides a device and a method for heating and controlling temperature of sewage inlet water by adopting an air energy heat pump, wherein the device comprises the following steps: the system comprises an air energy heat pump (1), a heat exchange liquid heat preservation tank (2) and a temperature heat exchanger (3); the air energy heat pump (1) and the heat exchange liquid heat preservation tank (2) form a primary circulation system; the heat exchange liquid heat preservation tank (2) and the temperature heat exchanger (3) form a secondary circulation system. The invention provides a device and a method for heating and controlling temperature of sewage inlet water by adopting an air energy heat pump, which are applied to sewage treatment in alpine regions, so that the sewage inlet water is heated to a preset temperature, the sewage treatment effect is ensured, and the device and the method also have the advantages of high heating and heat exchange efficiency, low energy consumption, small heat loss and the like.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a device and a method for heating and controlling temperature of sewage inlet water by adopting an air-source heat pump.
Background
For winter gas in northern China, high-altitude rural areas and the likeIn cold regions, when conventional domestic sewage treatment processes are used, e.g. activated sludge process, AO, A2O, MBR or contact oxidation method or other deformation process, and the core is to purify water quality by the growth and breeding of microorganisms. However, when the above sewage treatment process is adopted, the following problems are mainly caused: because the sewage inlet temperature is low, the growth and the breeding of biological bacteria are obviously hindered, thereby seriously influencing the sewage treatment effect and even causing the paralysis problem of the whole sewage treatment process.
In order to solve the problem of low temperature of sewage in cold regions, the prior art tries to adopt the following method: 1. the common electric heating mode has the problems of high energy consumption and impracticality; 2. the solar or vacuum tube heating mode is adopted, but the problems of large occupied area, high cost, difficult maintenance in winter, unstable heating and the like exist; 3. building heat preservation measures or heat preservation modes of deep burying below a frozen soil layer are adopted, but the problem of low-temperature rise of inlet water cannot be solved; 4. the rear-end constructed wetland is adopted for compensation, but plants cannot grow in winter, and the constructed wetland is not practical in the north; 5. the cultivation of low-temperature strains is adopted, but the cost is high, the temperature is limited, and the method cannot be applied to most areas. 6. Other methods are more costly and not suitable for use in dispersed areas.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a device and a method for heating and controlling the temperature of sewage inlet water by adopting an air energy heat pump, which can effectively solve the problems.
The technical scheme adopted by the invention is as follows:
the invention provides a device for heating and controlling temperature of sewage water by adopting an air energy heat pump, which comprises: the system comprises an air energy heat pump (1), a heat exchange liquid heat preservation tank (2) and a temperature heat exchanger (3);
the air energy heat pump (1) is connected to the liquid inlet end of a heating heat exchanger in the heat exchange liquid heat preservation tank (2) through a heat pump liquid return pipe (RG 2); the liquid outlet end of a heating heat exchanger in the heat exchange liquid heat preservation tank (2) is connected to the liquid return end of the air energy heat pump (1) through a heat pump liquid supply pipe (RH2), wherein a primary circulating pump (4) is installed on the heat pump liquid supply pipe (RH2), so that a primary circulating system is formed, and a heat exchange medium in the primary circulating system is a refrigerant;
the antifreeze solution is stored in the heat exchange solution heat preservation tank (2), and is heated and preserved through a primary circulating system;
the liquid outlet end of the antifreeze liquid of the heat exchange liquid heat preservation tank (2) is connected to the liquid inlet end of the temperature heat exchanger (3) through a temperature rise liquid supply pipe (RG 1); a secondary circulating pump (5) is arranged in the temperature-rising liquid supply pipe (RG 1); the liquid outlet end of the temperature heat exchanger (3) is connected to the antifreeze liquid return end of the heat exchange liquid heat preservation tank (2) through a temperature rise liquid return pipe (RH1), so that a secondary circulation system is formed, and a heat exchange medium in the secondary circulation system is antifreeze liquid;
a liquid level sensor (14) is arranged in the heat exchange liquid heat preservation tank (2) and is used for detecting the liquid level height change of the antifreeze liquid, and when the liquid level change speed is detected to be abnormally high, an alarm is given out to indicate the leakage of the antifreeze liquid; when the liquid level is detected to be lower than the set liquid level limit value, prompting liquid supplement;
wherein the temperature heat exchanger (3) is arranged in the sewage pretreatment tank;
a first control valve is arranged in the heat pump liquid supply pipe (RH 2); the heat pump liquid return pipe (RG2) is provided with a second control valve; the temperature rising liquid supply pipe (RG1) is provided with a third control valve, and the temperature rising liquid returning pipe (RH1) is provided with a fourth control valve.
Preferably, the primary circulating pump (4) adopts two circulating pumps which are arranged in parallel; the secondary circulating pump (5) adopts two circulating pumps which are arranged in parallel;
or the primary circulating pump (4) and the secondary circulating pump (5) are both single circulating pumps.
Preferably, the method further comprises the following steps: a main controller, a 1 st temperature measuring instrument (6) and a 2 nd temperature measuring instrument (7);
the 1 st temperature measuring instrument (6) is arranged in the heat exchange liquid heat preservation tank (2); the 2 nd temperature measuring instrument (7) is arranged in the sewage pretreatment tank;
the output ends of the 1 st temperature measuring instrument (6) and the 2 nd temperature measuring instrument (7) are connected to the input end of the main controller; and the output end of the main controller is respectively connected with the control ends of the primary circulating pump (4) and the secondary circulating pump (5).
Preferably, a heat meter (8) and a decontamination filter (9) are arranged in the warming liquid return pipe (RH 1);
the heat pump liquid supply pipe (RH2) is provided with a first pressure gauge (10); a second pressure gauge (11) is arranged on the temperature rising liquid supply pipe (RG 1);
the heat pump liquid return pipe (RG2) is arranged at a position close to the air energy heat pump (1) and is provided with a first thermometer (12);
and a second thermometer (13) is arranged at the position of the warming liquid return pipe (RH1) close to the temperature heat exchanger (3).
Preferably, the heat pump liquid supply pipe (RH2), the heat pump liquid return pipe (RG2), the warming liquid supply pipe (RG1) and the warming liquid return pipe (RH1) are all stainless steel pipes, and are externally coated with heat insulation cotton.
Preferably, the temperature heat exchanger (3) comprises a plurality of coils (3-1) arranged in parallel, or a plurality of coils (3-1) arranged in series;
both ends of each coil (3-1) are respectively communicated with corresponding positions of the warming liquid supply pipe (RG1) and the warming liquid return pipe (RH 1);
the coil pipe (3-1) is made of stainless steel.
The invention also provides a method for adopting the device for heating and controlling the temperature of the sewage inlet water by the air-source heat pump, which comprises the following steps:
selecting a heat exchange liquid heat preservation tank (2) with the matched volume according to the water inflow of the sewage in the same day; antifreeze is stored in the heat exchange liquid heat preservation tank (2);
step 3, the sewage enters a pretreatment tank, and in the process of pretreating the sewage in the pretreatment tank, the sewage in the pretreatment tank is heated to a set temperature through the heating and heat exchange action of a temperature heat exchanger (3); the heated sewage flows into sewage treatment equipment for sewage treatment;
wherein, the sewage in the pretreatment tank is heated by adopting the following method:
step 3.1, the heat preservation control process of the antifreeze in the heat exchange liquid heat preservation tank (2) is as follows:
antifreeze solution is stored in the heat exchange solution heat preservation tank (2), and the temperature of the antifreeze solution in the heat exchange solution heat preservation tank (2) is monitored in real time through a temperature measuring instrument (6) 1; if the temperature of the antifreeze liquid reaches a first set temperature T1, the primary circulating pump (4) is closed; if the temperature of the antifreeze is lower than the first set temperature T1, starting the primary circulating pump (4);
the air energy heat pump (1) adopts a refrigerant as a working medium; the air energy heat pump (1) continuously completes the thermodynamic cycle process of evaporating and absorbing heat in the environment, compressing, condensing to release heat, throttling and re-evaporating by a refrigerant, inputs the heat into a heating heat exchanger in the heat exchange liquid heat preservation tank (2) through a heat pump liquid return pipe (RG2), and performs heating heat exchange with antifreeze liquid stored in the heat exchange liquid heat preservation tank (2);
under the action of a primary circulating system, the antifreeze in the heat-exchange liquid heat-preservation tank (2) continuously raises the temperature of the antifreeze in the heat-exchange liquid heat-preservation tank (2) until the antifreeze reaches a first set temperature T1, and a primary circulating pump (4) is turned off;
step 3.2, the temperature heat exchanger (3) heats and exchanges heat to the sewage in the pretreatment tank:
the temperature of sewage in the pretreatment tank is monitored in real time by a 2 nd temperature measuring instrument (7); if the sewage temperature reaches a second set temperature T2, the secondary circulation pump (5) is closed; if the sewage temperature is lower than a second set temperature T2, starting a secondary circulating pump (5);
antifreeze in the heat-exchange liquid heat-preservation tank (2) is input into the temperature heat exchanger (3) through a temperature-rising liquid supply pipe (RG1) under the action of a secondary circulating pump (5), and the heating of the sewage in the pretreatment tank is realized through the heat exchange action between the temperature heat exchanger (3) and the sewage in the pretreatment tank;
the antifreeze after heat exchange flows back to the heat exchange liquid heat-preserving tank (2) through a heating liquid return pipe (RH1), so that the antifreeze heat exchange external circulation process between the heat exchange liquid heat-preserving tank (2) and the temperature heat exchanger (3) is realized; in the process, the temperature of the sewage in the pretreatment tank is continuously increased through the heat exchange effect until the second set temperature T2 is reached, and the secondary circulating pump (5) is closed;
through the processes, the heat exchange liquid heat preservation tank (2) is used as a buffer, and the antifreeze in the heat exchange liquid heat preservation tank (2) is heated through circulation between the air energy heat pump (1) and the heat exchange liquid heat preservation tank (2); through the circulation between heat transfer liquid heat preservation jar (2) and temperature heat exchanger (3), realize the heating to the interior sewage of preliminary treatment pond, and then realized the utilization of air energy.
Preferably, the antifreeze is prepared by 99.9 percent of terylene grade glycol and other additives, the freezing point is-35 ℃, the boiling point is 108 ℃, and the PH value is 8.5-9.
Preferably, the method further comprises the following steps:
a first pressure gauge (10) is installed through a heat pump liquid supply pipe (RH2), a second pressure gauge (11) is installed through a temperature rise liquid supply pipe (RG1), the pressure of a pipeline is measured, and whether pipeline leakage or blockage occurs or not is judged through the pressure of the pipeline.
The device and the method for heating and controlling the temperature of the sewage inlet water by adopting the air energy heat pump have the following advantages that:
the invention provides a device and a method for heating and controlling temperature of sewage inlet water by adopting an air energy heat pump, which are applied to sewage treatment in alpine regions, so that the sewage inlet water is heated to a preset temperature, the sewage treatment effect is ensured, and the device and the method also have the advantages of high heating and heat exchange efficiency, low energy consumption, small heat loss and the like.
Drawings
FIG. 1 is a schematic structural diagram of a device for heating and controlling temperature of sewage water by using an air-source heat pump according to the present invention;
FIG. 2 is a detailed structural diagram of the device for heating and controlling temperature of sewage water by using an air-source heat pump according to the present invention;
fig. 3 is a schematic structural diagram of a temperature heat exchanger provided by the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a device and a method for heating and controlling temperature of sewage inlet water by adopting an air energy heat pump, which are applied to sewage treatment in alpine regions.
Referring to fig. 1 to 3, the present invention provides a device for heating and controlling temperature of sewage water by using an air energy heat pump, comprising: the system comprises an air energy heat pump 1, a heat exchange liquid heat preservation tank 2 and a temperature heat exchanger 3;
the air energy heat pump 1 is connected to the liquid inlet end of a heating heat exchanger in the heat exchange liquid heat preservation tank 2 through a heat pump liquid return pipe RG 2; the liquid outlet end of a heating heat exchanger in the heat exchange liquid heat preservation tank 2 is connected to the liquid return end of the air energy heat pump 1 through a heat pump liquid supply pipe RH2, wherein a primary circulating pump 4 is installed on the heat pump liquid supply pipe RH2, so that a primary circulating system is formed, and a heat exchange medium in the primary circulating system is a refrigerant;
the antifreeze solution is stored in the heat exchange solution heat preservation tank 2, and is heated and preserved through a primary circulating system;
the liquid outlet end of the antifreeze solution of the heat exchange solution heat preservation tank 2 is connected to the liquid inlet end of the temperature heat exchanger 3 through a heating liquid supply pipe RG 1; a secondary circulating pump 5 is arranged in the temperature-rising liquid supply pipe RG 1; the liquid outlet end of the temperature heat exchanger 3 is connected to the antifreeze liquid return end of the heat exchange liquid heat preservation tank 2 through a temperature rise liquid return pipe RH1, so that a secondary circulation system is formed, and a heat exchange medium in the secondary circulation system is antifreeze liquid;
a liquid level sensor 14 is arranged in the heat exchange liquid heat preservation tank 2 and is used for detecting the liquid level height change of the antifreeze liquid, and when the abnormal (over-fast) liquid level change speed is detected, an alarm is given out to indicate that the antifreeze liquid leaks and needs to be treated as soon as possible; and when the liquid level is detected to be lower than the set liquid level limit value, liquid supplementing is prompted.
Wherein, the temperature heat exchanger 3 is arranged in the sewage pretreatment tank;
a first control valve is arranged in the heat pump liquid supply pipe RH 2; a second control valve is arranged on a heat pump liquid return pipe RG 2; a third control valve is arranged on a heating liquid supply pipe RG1, and a fourth control valve is arranged on a heating liquid return pipe RH 1.
The principle is as follows:
the air energy heat pump 1 heats the heat exchange liquid in the heat exchange liquid heat preservation tank 2 through a primary circulation system closed pipeline (an internal flow refrigerant), and the primary circulation pump 4 stops running when the heat exchange liquid in the heat exchange liquid heat preservation tank 2 reaches a set temperature, so that the heat preservation and temperature control effects of the heat exchange liquid stored in the heat exchange liquid heat preservation tank 2 are realized.
The heat exchange liquid stored in the heat exchange liquid heat preservation tank 2 is pumped into the temperature heat exchanger 3 through a secondary circulation system (closed pipeline, internal flow heat exchange liquid) and a secondary circulation pump 5, the low-temperature water immersed in the sewage pretreatment tank is heated to the set temperature required by sewage treatment through the heat exchange effect of the temperature heat exchanger 3, and the secondary circulation pump 5 stops running.
The heat exchanger is arranged in the heat exchange liquid heat preservation tank 2 through a temperature measuring instrument 6 of the 1 st; the 2 nd temperature measuring instrument 7 is arranged in the sewage pretreatment tank; the output ends of the 1 st temperature measuring instrument 6 and the 2 nd temperature measuring instrument 7 are connected to the input end of the main controller; the output end of the main controller is respectively connected with the control ends of the primary circulating pump 4 and the secondary circulating pump 5.
Therefore, the 1 st temperature measuring instrument 6 and the 2 nd temperature measuring instrument 7 are used for starting and stopping the circulating pump in the primary and secondary circulating system, and automatic control of heating, heat preservation and circulation is realized.
Specifically, the method comprises the following steps: a primary circulation system: when the temperature in the heat exchange liquid heat preservation tank 2 is lower than the set temperature, the primary circulating pump 4 is started, and the heat exchange liquid is heated through the heating heat exchanger until the temperature of the heat exchange liquid in the heat exchange liquid heat preservation tank 2 is consistent with the set temperature.
A secondary circulation system: when the water temperature in the pool where the temperature heat exchanger 3 is located is lower than the set temperature, the secondary circulating pump 5 is started, and the heat exchange liquid in the heat exchange liquid heat preservation tank 2 is pumped into the temperature heat exchanger 3 until the water temperature in the pool where the temperature heat exchanger 3 is located is consistent with the set temperature.
In practical application, the following improvements and innovations can be further adopted:
(1) the primary circulating pump 4 adopts two circulating pumps which are arranged in parallel; the secondary circulation pump 5 adopts two circulation pumps arranged in parallel.
Of course, in practical application, a single circulation pump can be adopted according to the requirement degree of the operation on the system reliability.
(2) A heating liquid return pipe RH1 is provided with a heat meter 8 and a decontamination filter 9;
specifically, the decontamination filter 9 is located at the outlet of the temperature heat exchanger, and impurities in the heat exchange liquid which flows back are prevented from entering the heat exchange liquid heat preservation tank by filtering the heat exchange liquid, so that the impurities finally enter the air-source heat pump, and the air-source heat pump is blocked and damaged. And simultaneously used as a discharge port when impurities in the pipeline are blocked during initial installation or maintenance.
(3) A heat pump liquid supply pipe RH2 is provided with a first pressure gauge 10; a second pressure gauge 11 is arranged on a temperature rising liquid supply pipe RG 1;
install first manometer 10 through heat pump liquid feed pipe RH2, second manometer 11 is installed to intensification liquid feed pipe RG1, and the manometer is close to the circulating pump of corresponding position for survey pipeline pressure, and then judge whether take place the pipeline leakage condition through pipeline pressure.
(4) A heat pump liquid return pipe RG2 is arranged at a position close to the air-source heat pump 1, and a first temperature meter 12 is arranged;
the first thermometer 12 is arranged at the liquid supply end of the air-source heat pump 1, the return temperature of the antifreeze is detected through the first thermometer 12, whether the return temperature of the antifreeze is consistent with the temperature of the antifreeze in the heat exchange liquid heat preservation tank 2 or not is compared, and if the return temperature of the antifreeze is consistent with the temperature of the antifreeze in the heat exchange liquid heat preservation tank 2, a heat exchange fault is indicated; in addition, the first thermometer 12 can also detect whether the temperature exceeds the boiling point temperature of the heat exchange liquid, thereby ensuring the use safety.
A second thermometer 13 is installed at a position close to the temperature heat exchanger 3 in the temperature rising liquid returning pipe RH 1.
The second thermometer 13 is installed at the liquid outlet end of the temperature heat exchanger 3, the second thermometer 13 is used for detecting the secondary reflux temperature of the antifreeze, whether the secondary reflux temperature of the antifreeze is consistent with the temperature of the antifreeze in the heat exchange liquid heat preservation tank 2 or not is compared, and if the secondary reflux temperature of the antifreeze is consistent with the temperature of the antifreeze in the heat exchange liquid heat preservation tank 2, the heat exchange is failed, and the possible reason is that: the heat exchange liquid is removed when the temperature is not successfully exchanged due to overlarge flow of the circulating pump, and the heat exchange cannot be carried out due to failure of the temperature heat exchanger due to a second reason;
(5) heat pump liquid feed pipe RH2, heat pump liquid return pipe RG2, intensification liquid feed pipe RG1 and intensification liquid return pipe RH1 all adopt stainless steel pipeline, and the outside cladding keeps warm cottonly, increases the anticorrosive function of pipeline and reduces the temperature loss.
(6) As shown in fig. 3, the temperature heat exchanger 3 includes a plurality of coils 3-1 arranged in parallel; two ends of each coil pipe 3-1 are respectively communicated with corresponding positions of a heating liquid supply pipe RG1 and a heating liquid return pipe RH 1;
in practical application, the coils can also be arranged in series according to requirements.
The coil 3-1 is made of stainless steel. Has the advantages that: the heat-conducting material has good heat conductivity, corrosion resistance and low manufacturing cost; the prefabricated coil pipe structure is manufactured in a modularized mode according to the heat exchange quantity and the size of the pool body after being processed in a factory, and installation in a field pool is facilitated.
In practical application, the material of the coil 3-1 can also be other materials with high heat dissipation efficiency.
(7) In the invention, the heat exchange liquid adopts antifreeze.
The antifreeze fluid comprises the following components in percentage by weight: is prepared by 99.9 percent of terylene grade glycol and other additives (slow release scale inhibitor, defoamer, preservative, slow release agent and the like), and has the freezing point of-35 ℃, the boiling point of 108 ℃ and the PH value of 8.5-9.
The selection principle of the antifreeze is as follows: according to the lowest local temperature in winter and the purity of the raw material formula of the anti-freezing solution, the performances of low temperature resistance, low corrosion resistance, long service life and the like are ensured.
The antifreeze liquid is adopted as the heat exchange liquid, and has the following advantages:
1) the freezing point of the antifreeze is suitable for being used in low-temperature climate in winter in the north;
2) the boiling point of the antifreeze meets the condition that air can be heated;
3) the antifreeze has good heat transfer performance and can be suitable for a temperature heat exchanger to heat sewage;
4) has no corrosion to metal and good chemical stability.
5) The volatility is small, the vapor pressure is low, and the times of supplement of the antifreeze liquid due to volatilization are reduced;
6) the viscosity is moderate, the temperature change is small, the thermal stability is good, the price is moderate, the field requirement of a heat source pump is met, and the cost is low.
In the invention, the air energy heat pump operates through the operation of the compressor system, absorbs heat in the air to produce hot water, saves energy by more than 25% compared with other heating modes, and is suitable for northern areas. The whole system is not limited by installation conditions, has the advantages of low temperature resistance, corrosion resistance, good heat preservation and safe use, and has no electric leakage danger and high safety because no electric element is directly contacted with water.
The invention also provides a method for adopting the device for heating and controlling the temperature of the sewage inlet water by the air-source heat pump, which comprises the following steps:
selecting a heat exchange liquid heat preservation tank 2 with the matched volume according to the water inflow of the sewage in the same day; the antifreeze solution is stored in the heat exchange solution heat preservation tank 2;
step 3, the sewage enters a pretreatment tank, and in the process of pretreating the sewage in the pretreatment tank, the sewage in the pretreatment tank is heated to a set temperature through the heating and heat exchange effect of a temperature heat exchanger 3; the heated sewage flows into sewage treatment equipment for sewage treatment;
wherein, the sewage in the pretreatment tank is heated by adopting the following method:
step 3.1, the heat preservation control process of the antifreeze in the heat exchange liquid heat preservation tank 2 is as follows:
antifreeze solution is stored in the heat exchange solution heat preservation tank 2, and the temperature of the antifreeze solution in the heat exchange solution heat preservation tank 2 is monitored in real time through a temperature measuring instrument 1; if the antifreeze temperature reaches the first set temperature T1, the primary circulation pump 4 is turned off; if the temperature of the antifreeze is lower than the first set temperature T1, starting the primary circulating pump 4;
the air energy heat pump 1 adopts a refrigerant as a working medium; the air energy heat pump 1 continuously completes the thermodynamic cycle processes of evaporating and absorbing heat in the environment, compressing, condensing to release heat, throttling and re-evaporating by a refrigerant, inputs the heat into a heating heat exchanger in the heat exchange liquid heat preservation tank 2 through a heat pump liquid return pipe RG2, and performs heating heat exchange with antifreeze liquid stored in the heat exchange liquid heat preservation tank 2;
the air energy heat pump 1 absorbs the energy of the surrounding environment, and the primary circulating system heats the antifreeze solution; in the process, the temperature of the antifreeze in the heat exchange liquid heat preservation tank 2 is continuously increased until the first set temperature T1 is reached, and the primary circulating pump 4 is closed;
step 3.2, the temperature heat exchanger 3 heats and exchanges heat processes to the sewage in the pretreatment tank:
monitoring the temperature of sewage in the pretreatment tank in real time through a 2 nd temperature measuring instrument 7; if the sewage temperature reaches the second set temperature T2, turning off the secondary circulation pump 5; if the sewage temperature is lower than the second set temperature T2, starting the secondary circulating pump 5;
the antifreeze solution in the heat exchange liquid heat preservation tank 2 is input into the temperature heat exchanger 3 through a temperature rise liquid supply pipe RG1 under the action of a secondary circulating pump 5, and the heating of the sewage in the pretreatment tank is realized through the heat exchange action of the temperature heat exchanger 3 and the sewage in the pretreatment tank;
the antifreeze after heat exchange flows back to the heat exchange liquid heat preservation tank 2 through the heating liquid return pipe RH1, so that the antifreeze heat exchange external circulation process between the heat exchange liquid heat preservation tank 2 and the temperature heat exchanger 3 is realized; in the process, the temperature of the sewage in the pretreatment tank is continuously increased through the heat exchange effect until the second set temperature T2 is reached, and the secondary circulating pump 5 is closed;
through the processes, the heat exchange liquid heat preservation tank 2 is used as a buffer, and the antifreeze in the heat exchange liquid heat preservation tank 2 is heated through circulation between the primary circulation system and the heat exchange liquid heat preservation tank 2; through the circulation between heat transfer liquid heat preservation jar 2 and the temperature heat exchanger 3, realize the heating to the interior sewage of preliminary treatment pond, and then realized the utilization of air energy.
Under various process conditions, the activity of denitrifying bacteria (removing total nitrogen) is optimal at about 20-25 ℃; along with the reduction of the water temperature, the activity of denitrifying bacteria is gradually reduced; when the water temperature is lower than 15 ℃, the activity of denitrifying bacteria is greatly influenced; the water temperature is lower than 12 ℃, and the activity of other microorganisms (including an activated sludge method and a biofilm method) begins to be obviously reduced; the water temperature is lower than 8 ℃, and the microbial activity is reduced by more than 50%. Due to the climate and geographical conditions of long winter time in alpine regions, rural domestic sewage in most regions can be lowered to about 4 ℃ in winter, the water temperature in extreme condition regions is lowered to 2-3 ℃ in winter, once the water temperature does not meet the requirement of microorganism survival, the sewage cannot be effectively treated, the effluent does not reach the standard, the smell is stink, and the environment is not friendly. Therefore, the heating temperature control is the primary condition for the sewage treatment station to operate under the low temperature condition.
The device and the method for heating and controlling the temperature of the sewage by adopting the air energy heat pump solve the difficult problem of the biotechnology sewage treatment in the alpine region, and have the following advantages:
1. compared with other heating modes (a gas boiler, an electric boiler, a heating rod, an air conditioner, a heater, solar energy and the like), the air energy heating can effectively save energy by more than 25%. Such as 1/4 for a common electric water heater, 1/3 for a gas water heater, and 1/2 for a solar water heater.
2. Accurate temperature control ensures that the sewage inlet can be stabilized at any reasonable temperature required, a good growth environment is created for the water outlet stability, and stable water outlet in four seasons, particularly in winter, is further realized.
3. Because the accurate temperature control is realized, the links such as aeration, reflux, bacteria addition (low-temperature bacteria), medicine addition (when required by the process) and the like required by biological treatment are simple and easy to control, so that the energy consumption is reduced, the operation and maintenance are reduced, the water outlet stability is improved, and the comprehensive effect is obvious.
4. Deep burying or plant building arrangement is not needed, and the construction cost is reduced;
5. the treatment capacity is the same, the occupied area is small, no wetland is needed, and the influence of climate is avoided;
6. the adoption of proper media and materials can ensure that the complete set of equipment has low temperature resistance, corrosion resistance, good heat preservation and easy maintenance.
7. According to the invention, the heat exchange liquid heat preservation tank is adopted as an intermediate heat exchange link to play two roles, (1) the heat exchange liquid heat preservation tank with a proper volume can be selected according to the daily sewage inflow flow to be heated, the antifreeze liquid is stored, the highest heating and heat exchange efficiency is ensured, the matching of a heat source pump is most economical, the energy consumption is low, and the burden of a user is reduced; (2) through heat preservation, the heat dissipation loss at low temperature in winter at night is reduced.
8. According to the invention, the sewage pretreatment tanks at the front end of the sewage treatment equipment are generally completed by connecting a plurality of sewage pretreatment tanks in series, so that different sewage pretreatment operations are realized, one or more sewage pretreatment tanks with matched volumes can be selected according to the daily sewage inflow, and the temperature heat exchangers are respectively installed in parallel or in series, so that the heating is realized in the sewage pretreatment process, the heated water is ensured to directly enter the sewage treatment equipment, the heating energy consumption is low, the heat loss is minimum, the biochemical treatment degradation effect of the pretreatment section can be improved, and part of the inflow load is reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (9)
1. The utility model provides an adopt air energy heat pump to sewage intake device of heating accuse temperature which characterized in that includes: the system comprises an air energy heat pump (1), a heat exchange liquid heat preservation tank (2) and a temperature heat exchanger (3);
the air energy heat pump (1) is connected to the liquid inlet end of a heating heat exchanger in the heat exchange liquid heat preservation tank (2) through a heat pump liquid return pipe (RG 2); the liquid outlet end of a heating heat exchanger in the heat exchange liquid heat preservation tank (2) is connected to the liquid return end of the air energy heat pump (1) through a heat pump liquid supply pipe (RH2), wherein a primary circulating pump (4) is installed on the heat pump liquid supply pipe (RH2), so that a primary circulating system is formed, and a heat exchange medium in the primary circulating system is a refrigerant;
the antifreeze solution is stored in the heat exchange solution heat preservation tank (2), and is heated and preserved through a primary circulating system;
the liquid outlet end of the antifreeze liquid of the heat exchange liquid heat preservation tank (2) is connected to the liquid inlet end of the temperature heat exchanger (3) through a temperature rise liquid supply pipe (RG 1); a secondary circulating pump (5) is arranged in the temperature-rising liquid supply pipe (RG 1); the liquid outlet end of the temperature heat exchanger (3) is connected to the antifreeze liquid return end of the heat exchange liquid heat preservation tank (2) through a temperature rise liquid return pipe (RH1), so that a secondary circulation system is formed, and a heat exchange medium in the secondary circulation system is antifreeze liquid;
a liquid level sensor (14) is arranged in the heat exchange liquid heat preservation tank (2) and is used for detecting the liquid level height change of the antifreeze liquid, and when the liquid level change speed is detected to be abnormally high, an alarm is given out to indicate the leakage of the antifreeze liquid; when the liquid level is detected to be lower than the set liquid level limit value, prompting liquid supplement;
wherein the temperature heat exchanger (3) is arranged in the sewage pretreatment tank;
a first control valve is arranged in the heat pump liquid supply pipe (RH 2); the heat pump liquid return pipe (RG2) is provided with a second control valve; the temperature rising liquid supply pipe (RG1) is provided with a third control valve, and the temperature rising liquid returning pipe (RH1) is provided with a fourth control valve.
2. The device for heating and controlling the temperature of the sewage inlet water by adopting the air-source heat pump as claimed in claim 1, wherein the primary circulating pump (4) adopts two circulating pumps which are arranged in parallel; the secondary circulating pump (5) adopts two circulating pumps which are arranged in parallel;
or the primary circulating pump (4) and the secondary circulating pump (5) are both single circulating pumps.
3. The device for heating and controlling the temperature of the sewage inlet water by the air-source heat pump according to claim 1, further comprising: a main controller, a 1 st temperature measuring instrument (6) and a 2 nd temperature measuring instrument (7);
the 1 st temperature measuring instrument (6) is arranged in the heat exchange liquid heat preservation tank (2); the 2 nd temperature measuring instrument (7) is arranged in the sewage pretreatment tank;
the output ends of the 1 st temperature measuring instrument (6) and the 2 nd temperature measuring instrument (7) are connected to the input end of the main controller; and the output end of the main controller is respectively connected with the control ends of the primary circulating pump (4) and the secondary circulating pump (5).
4. The device for heating and controlling the temperature of the sewage inlet water by using the air-source heat pump as claimed in claim 1, wherein a heat meter (8) and a decontamination filter (9) are installed in the heating liquid return pipe (RH 1);
the heat pump liquid supply pipe (RH2) is provided with a first pressure gauge (10); a second pressure gauge (11) is arranged on the temperature rising liquid supply pipe (RG 1);
the heat pump liquid return pipe (RG2) is arranged at a position close to the air energy heat pump (1) and is provided with a first thermometer (12);
and a second thermometer (13) is arranged at the position of the warming liquid return pipe (RH1) close to the temperature heat exchanger (3).
5. The device for heating and controlling the temperature of the sewage inlet water by using the air-source heat pump as claimed in claim 1, wherein the heat pump liquid supply pipe (RH2), the heat pump liquid return pipe (RG2), the temperature rise liquid supply pipe (RG1) and the temperature rise liquid return pipe (RH1) are all stainless steel pipes, and are externally covered with heat preservation cotton.
6. The device for heating and controlling the temperature of sewage inlet water by adopting the air-source heat pump as claimed in claim 1, wherein the temperature heat exchanger (3) comprises a plurality of coils (3-1) arranged in parallel, or a plurality of coils (3-1) arranged in series;
both ends of each coil (3-1) are respectively communicated with corresponding positions of the warming liquid supply pipe (RG1) and the warming liquid return pipe (RH 1);
the coil pipe (3-1) is made of stainless steel.
7. The method for the sewage water inlet heating and temperature controlling device adopting the air-source heat pump as claimed in any one of claims 1 to 6, is characterized by comprising the following steps:
step 1, selecting a pretreatment tank with a matched volume according to the current sewage inflow; placing a temperature heat exchanger (3) in a pretreatment pool;
selecting a heat exchange liquid heat preservation tank (2) with the matched volume according to the water inflow of the sewage in the same day; antifreeze is stored in the heat exchange liquid heat preservation tank (2);
step 2, completing the relevant connection among the air energy heat pump (1), the heat exchange liquid heat preservation tank (2) and the temperature heat exchanger (3);
step 3, the sewage enters a pretreatment tank, and in the process of pretreating the sewage in the pretreatment tank, the sewage in the pretreatment tank is heated to a set temperature through the heating and heat exchange action of a temperature heat exchanger (3); the heated sewage flows into sewage treatment equipment for sewage treatment;
wherein, the sewage in the pretreatment tank is heated by adopting the following method:
step 3.1, the heat preservation control process of the antifreeze in the heat exchange liquid heat preservation tank (2) is as follows:
antifreeze solution is stored in the heat exchange solution heat preservation tank (2), and the temperature of the antifreeze solution in the heat exchange solution heat preservation tank (2) is monitored in real time through a temperature measuring instrument (6) 1; if the temperature of the antifreeze liquid reaches a first set temperature T1, the primary circulating pump (4) is closed; if the temperature of the antifreeze is lower than the first set temperature T1, starting the primary circulating pump (4);
the air energy heat pump (1) adopts a refrigerant as a working medium; the air energy heat pump (1) continuously completes the thermodynamic cycle process of evaporating and absorbing heat in the environment, compressing, condensing to release heat, throttling and re-evaporating by a refrigerant, inputs the heat into a heating heat exchanger in the heat exchange liquid heat preservation tank (2) through a heat pump liquid return pipe (RG2), and performs heating heat exchange with antifreeze liquid stored in the heat exchange liquid heat preservation tank (2);
under the action of a primary circulating system, the antifreeze in the heat-exchange liquid heat-preservation tank (2) continuously raises the temperature of the antifreeze in the heat-exchange liquid heat-preservation tank (2) until the antifreeze reaches a first set temperature T1, and a primary circulating pump (4) is turned off;
step 3.2, the temperature heat exchanger (3) heats and exchanges heat to the sewage in the pretreatment tank:
the temperature of sewage in the pretreatment tank is monitored in real time by a 2 nd temperature measuring instrument (7); if the sewage temperature reaches a second set temperature T2, the secondary circulation pump (5) is closed; if the sewage temperature is lower than a second set temperature T2, starting a secondary circulating pump (5);
antifreeze in the heat-exchange liquid heat-preservation tank (2) is input into the temperature heat exchanger (3) through a temperature-rising liquid supply pipe (RG1) under the action of a secondary circulating pump (5), and the heating of the sewage in the pretreatment tank is realized through the heat exchange action between the temperature heat exchanger (3) and the sewage in the pretreatment tank;
the antifreeze after heat exchange flows back to the heat exchange liquid heat-preserving tank (2) through a heating liquid return pipe (RH1), so that the antifreeze heat exchange external circulation process between the heat exchange liquid heat-preserving tank (2) and the temperature heat exchanger (3) is realized; in the process, the temperature of the sewage in the pretreatment tank is continuously increased through the heat exchange effect until the second set temperature T2 is reached, and the secondary circulating pump (5) is closed;
through the processes, the heat exchange liquid heat preservation tank (2) is used as a buffer, and the antifreeze in the heat exchange liquid heat preservation tank (2) is heated through circulation between the air energy heat pump (1) and the heat exchange liquid heat preservation tank (2); through the circulation between heat transfer liquid heat preservation jar (2) and temperature heat exchanger (3), realize the heating to the interior sewage of preliminary treatment pond, and then realized the utilization of air energy.
8. The method of claim 7, wherein the anti-freeze fluid is made of 99.9% terylene grade glycol and other additives, and has a freezing point of-35 ℃, a boiling point of 108 ℃, and a pH value of 8.5-9.
9. The method for using the air-source heat pump to heat and control temperature of sewage inlet water as claimed in claim 7, further comprising:
a first pressure gauge (10) is installed through a heat pump liquid supply pipe (RH2), a second pressure gauge (11) is installed through a temperature rise liquid supply pipe (RG1), the pressure of a pipeline is measured, and whether pipeline leakage or blockage occurs or not is judged through the pressure of the pipeline.
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| CN202110967650.3A CN113686021A (en) | 2021-08-23 | 2021-08-23 | Device and method for heating and controlling temperature of sewage inlet water by adopting air-source heat pump |
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| CN202110967650.3A CN113686021A (en) | 2021-08-23 | 2021-08-23 | Device and method for heating and controlling temperature of sewage inlet water by adopting air-source heat pump |
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| GB2054549A (en) * | 1979-06-18 | 1981-02-18 | Grosse W D | Process and apparatus for the anaerobic treatment of sewage |
| DE2945035A1 (en) * | 1979-11-08 | 1981-05-27 | Tecon Technische Beratungs-Gesellschaft mbH, 7140 Ludwigsburg | Energy saving in biological sewage treatment - by heat pumps and heat exchangers |
| CN204880484U (en) * | 2015-08-05 | 2015-12-16 | 黄国和 | Steam ability and sewage source coupling air conditioning system |
| CN109000362A (en) * | 2018-08-24 | 2018-12-14 | 马志明 | A kind of sewage temperature-raising device |
| CN111547845A (en) * | 2020-06-02 | 2020-08-18 | 石河子大学 | Anaerobic ammonia oxidation reactor stable operation system based on multi-energy complementation |
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2021
- 2021-08-23 CN CN202110967650.3A patent/CN113686021A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2054549A (en) * | 1979-06-18 | 1981-02-18 | Grosse W D | Process and apparatus for the anaerobic treatment of sewage |
| DE2945035A1 (en) * | 1979-11-08 | 1981-05-27 | Tecon Technische Beratungs-Gesellschaft mbH, 7140 Ludwigsburg | Energy saving in biological sewage treatment - by heat pumps and heat exchangers |
| CN204880484U (en) * | 2015-08-05 | 2015-12-16 | 黄国和 | Steam ability and sewage source coupling air conditioning system |
| CN109000362A (en) * | 2018-08-24 | 2018-12-14 | 马志明 | A kind of sewage temperature-raising device |
| CN111547845A (en) * | 2020-06-02 | 2020-08-18 | 石河子大学 | Anaerobic ammonia oxidation reactor stable operation system based on multi-energy complementation |
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Application publication date: 20211123 |