阅读说明：本技术 一种分散式污水站出水余温回用加热节能系统及方法 (Distributed sewage station outlet water residual heat recycling heating energy-saving system and method ) 是由 鲍晓宇 付远 付然 李铭儒 于 2021-08-18 设计创作，主要内容包括：本发明提供一种分散式污水站出水余温回用加热节能系统及方法,按从前向后方向,依次设置预热水池、加热水池、生化处理池、中间水池和排水池；在预热水池设置换热装置,在中间水池设置液位计和循环水泵；所述循环水泵通过第一输水管道连通到所述换热装置的进水口；所述换热装置的排水口通过第二输水管道连通到所述排水池。本发明提供一种分散式污水站出水余温回用加热节能系统,应用于高寒或北方地区的污水处理,将污水设施排出的较高温度的出水,通过循环水泵循环回用至前端换热装置进行换热,使污水进水温度升高,利用余温回用技术大大降低能耗,达到实用节能目的。(The invention provides a distributed waste heat recycling heating energy-saving system and a method for sewage station outlet water, wherein a preheating water tank, a heating water tank, a biochemical treatment tank, a middle water tank and a drainage tank are sequentially arranged from front to back; a heat exchange device is arranged in the preheating water tank, and a liquid level meter and a circulating water pump are arranged in the middle water tank; the circulating water pump is communicated to a water inlet of the heat exchange device through a first water conveying pipeline; and the water outlet of the heat exchange device is communicated to the water drainage pool through a second water pipeline. The invention provides a distributed waste heat recycling heating energy-saving system for water discharged from a sewage station, which is applied to sewage treatment in alpine or northern areas.)

1. A distributed waste water temperature recycling heating energy-saving system for sewage station outlet water is characterized in that a preheating water tank, a heating water tank, a biochemical treatment tank, a middle water tank and a drainage tank are sequentially arranged from front to back;

a heat exchange device (1) is arranged in the preheating water tank, and a liquid level meter (2) and a circulating water pump (3) are arranged in the middle water tank; the circulating water pump (3) is communicated with a water inlet of the heat exchange device (1) through a first water conveying pipeline (4); the water outlet of the heat exchange device (1) is communicated with the water drainage pool through a second water pipeline (5);

the liquid level meter (2) and the circulating water pump (3) are both connected to a controller, and the start-stop action of the circulating water pump (3) is controlled through the liquid level of the middle water pool measured by the liquid level meter (2).

2. The distributed waste water station outlet waste water temperature recycling heating energy-saving system as claimed in claim 1, wherein the first water pipe (4) and the second water pipe (5) are coated with heat insulation material (6).

3. The decentralized waste water station outlet waste water temperature reuse heating energy saving system according to claim 1, wherein the first water pipe (4) and the second water pipe (5) both have a certain slope;

electromagnetic emptying valves (7) are installed on the low position sides of the first water conveying pipeline (4) and the second water conveying pipeline (5), and safety valves (8) are installed on the high position sides.

4. The decentralized waste water station outlet waste water temperature reuse heating energy saving system according to claim 1, wherein the first water pipe (4) is installed with an inlet water temperature thermometer (9); and the second water conveying pipeline (5) is provided with an outlet water temperature thermometer (10).

5. The decentralized waste water station outlet waste water temperature recycling heating energy saving system according to claim 1, wherein a first flange joint (11) is installed at a water inlet of the heat exchanging device (1) and is used for being communicated with the first water pipeline (4); and a water outlet of the heat exchange device (1) is provided with a second flange joint (12) which is used for being communicated and arranged with the second water pipeline (5).

6. The decentralized waste water station outlet waste water temperature reuse heating energy saving system according to claim 1, wherein the preheating water tank, the heating water tank, the biochemical treatment tank and the intermediate water tank are connected in series;

the water level of the communicating hole between the middle water tank and the drainage tank is higher than the high liquid level set by the liquid level meter; the middle water pool and the drainage pool are not communicated under a normal condition; only when the circulating water pump (3) fails and can not drain water or needs direct drainage temporarily, the water is drained through the communication hole.

7. The decentralized waste water station waste water temperature reuse heating energy saving system of any one of claims 1 to 6, characterized in that it comprises the following steps:

liquid level gauge (2) real-time detection middle pond's liquid level to open through opening of middle pond liquid level control circulating water pump (3) and stop the action, it is specific:

when the liquid level of the middle water tank reaches a preset high liquid level, the circulating water pump (3) acts to continuously pump warm water in the middle water tank into the heat exchange device (1) of the preheating water tank through the first water conveying pipeline (4) to exchange heat with sewage entering the preheating water tank;

after heat exchange, the temperature of the sewage in the preheating water tank rises, the sewage enters the heating water tank to be heated to a set temperature, the sewage enters the biochemical treatment tank to be subjected to biochemical treatment, and the treated warm water is discharged to the intermediate water tank;

the temperature of the water in the heat exchange device (1) is reduced after heat exchange, and the water is discharged to a drainage pool through a second water pipeline (5);

the discharge capacity of the circulating water pump (3) is determined according to the average water inflow of the intermediate water pool, and one water inflow period is controlled to realize uniform water pumping, so that the heat exchange device (1) achieves the optimal heat exchange effect;

when detecting that middle pond liquid level reaches and predetermineeing low liquid level, circulating water pump (3) stop, when treating that middle pond liquid level reaches and predetermineeing high liquid level, start once more, so relapse, realize the play water of biochemical treatment pond exhaust higher temperature, through circulating water pump (3) pump feed to heat transfer device (1) of front end, make the temperature of intaking that enters into the preheating water tank rise, utilize the surplus temperature retrieval and utilization to rise the temperature of intaking, reduce the energy consumption.

Technical Field

The invention belongs to the technical field of waste heat utilization, and particularly relates to a distributed sewage station outlet water waste heat recycling heating energy-saving system and method.

Background

When the sewage is treated by adopting a biochemical treatment mode in the alpine region, the following problems exist: the water inlet temperature of the sewage biochemical treatment facility is low, particularly in winter, which is far lower than 10-12 ℃ required by biological treatment, and the biochemical treatment is difficult to reach the standard. If the sewage is heated by adopting a pure heating mode at first and then is conveyed to a biochemical treatment tank for treatment, the problem of overhigh energy consumption exists.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a distributed sewage station outlet water residual heat recycling heating energy-saving system and a distributed sewage station outlet water residual heat recycling heating energy-saving method, which can effectively solve the problems.

The technical scheme adopted by the invention is as follows:

the invention provides a distributed waste heat recycling heating energy-saving system for effluent of a sewage station, which is sequentially provided with a preheating water tank, a heating water tank, a biochemical treatment tank, a middle water tank and a drainage tank from front to back;

a heat exchange device (1) is arranged in the preheating water tank, and a liquid level meter (2) and a circulating water pump (3) are arranged in the middle water tank; the circulating water pump (3) is communicated with a water inlet of the heat exchange device (1) through a first water conveying pipeline (4); the water outlet of the heat exchange device (1) is communicated with the water drainage pool through a second water pipeline (5);

the liquid level meter (2) and the circulating water pump (3) are both connected to a controller, and the start-stop action of the circulating water pump (3) is controlled through the liquid level of the middle water pool measured by the liquid level meter (2).

Preferably, the first water conveying pipeline (4) and the second water conveying pipeline (5) are coated with heat insulation materials (6) outside.

Preferably, the first water conveying pipeline (4) and the second water conveying pipeline (5) both have certain gradients;

electromagnetic emptying valves (7) are installed on the low position sides of the first water conveying pipeline (4) and the second water conveying pipeline (5), and safety valves (8) are installed on the high position sides.

Preferably, the first water conveying pipeline (4) is provided with an inlet water temperature thermometer (9); and the second water conveying pipeline (5) is provided with an outlet water temperature thermometer (10).

Preferably, a first flange joint (11) is arranged at a water inlet of the heat exchange device (1) and is used for being communicated with the first water conveying pipeline (4); and a water outlet of the heat exchange device (1) is provided with a second flange joint (12) which is used for being communicated and arranged with the second water pipeline (5).

Preferably, the preheating water tank, the heating water tank, the biochemical treatment tank and the intermediate water tank are connected in series;

the water level of the communicating hole between the middle water tank and the drainage tank is higher than the high liquid level set by the liquid level meter; the middle water pool and the drainage pool are not communicated under a normal condition; only when the circulating water pump (3) fails and can not drain water or needs direct drainage temporarily, the water is drained through the communication hole.

The invention also provides a method for the distributed waste heat recycling heating energy-saving system for the effluent of the sewage station, which comprises the following steps:

liquid level gauge (2) real-time detection middle pond's liquid level to open through opening of middle pond liquid level control circulating water pump (3) and stop the action, it is specific:

when the liquid level of the middle water tank reaches a preset high liquid level, the circulating water pump (3) acts to continuously pump warm water in the middle water tank into the heat exchange device (1) of the preheating water tank through the first water conveying pipeline (4) to exchange heat with sewage entering the preheating water tank;

after heat exchange, the temperature of the sewage in the preheating water tank rises, the sewage enters the heating water tank to be heated to a set temperature, the sewage enters the biochemical treatment tank to be subjected to biochemical treatment, and the treated warm water is discharged to the intermediate water tank;

the temperature of the water in the heat exchange device (1) is reduced after heat exchange, and the water is discharged to a drainage pool through a second water pipeline (5);

the discharge capacity of the circulating water pump (3) is determined according to the average water inflow of the intermediate water pool, and one water inflow period is controlled to realize uniform water pumping, so that the heat exchange device (1) achieves the optimal heat exchange effect;

when detecting that middle pond liquid level reaches and predetermineeing low liquid level, circulating water pump (3) stop, when treating that middle pond liquid level reaches and predetermineeing high liquid level, start once more, so relapse, realize the play water of biochemical treatment pond exhaust higher temperature, through circulating water pump (3) pump feed to heat transfer device (1) of front end, make the temperature of intaking that enters into the preheating water tank rise, utilize the surplus temperature retrieval and utilization to rise the temperature of intaking, reduce the energy consumption.

The distributed waste heat recycling heating energy-saving system and the method for the water discharged from the sewage station have the following advantages that:

the invention provides a distributed waste heat recycling heating energy-saving system for water discharged from a sewage station, which is applied to sewage treatment in alpine or northern areas.

Drawings

FIG. 1 is a top view of a distributed waste water station waste heat recycling heating energy saving system provided by the present invention;

FIG. 2 is a front view of the distributed waste water station waste heat recycling heating energy saving system provided by the present invention;

fig. 3 is a usage scene diagram of the distributed sewage station outlet waste heat recycling heating energy-saving system provided by the 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 distributed waste heat recycling heating energy-saving system for water discharged from a sewage station, which is applied to sewage treatment in alpine or northern areas.

Referring to fig. 1 and 2, the invention provides a distributed waste water heating and energy-saving system for reusing waste heat of outlet water of a sewage station, which is provided with a preheating water tank, a heating water tank, a biochemical treatment tank, an intermediate water tank and a drainage tank in sequence from front to back;

a heat exchange device 1 is arranged in a preheating water tank, and a liquid level meter 2 and a circulating water pump 3 are arranged in a middle water tank; the circulating water pump 3 is communicated with a water inlet of the heat exchange device 1 through a first water conveying pipeline 4; the water outlet of the heat exchange device 1 is communicated with a water drainage pool through a second water pipeline 5;

wherein, level gauge 2 and circulating water pump 3 all are connected to the controller, and the action is stopped in opening of the middle pond of measuring through level gauge 2, control circulating water pump 3.

Specifically, the liquid level meter 2 is mainly used for controlling the start and stop actions of the circulating water pump 3, when the liquid level reaches a preset high liquid level, the circulating water pump 3 acts to uniformly and continuously pump out warm water in the middle water tank, the discharge capacity of the circulating water pump 3 is selected according to the average water inflow, and uniform water pumping is realized in a water inflow period by control, so that the heat exchange device 1 can achieve the best heat exchange effect. When the liquid level is the preset low liquid level, the circulating water pump 3 is stopped, and the water pump is started again when the water level reaches the high liquid level again. Repeating the steps to realize heat exchange circulation.

The main ideas of the invention are as follows:

the invention divides the original pretreatment tank into a preheating water tank and a heating water tank, wherein the preheating water tank is used for providing a heat exchange space for a heat exchange device, so that the low-temperature inlet water has enough heat exchange time to achieve the purpose of fully utilizing the residual temperature, and simultaneously, the preheating is provided for a rear-end heating water tank, thereby reducing the energy consumption of rear-end heating. The heat exchange device adopts a type and materials which meet the requirements of high heat exchange efficiency, long service life and difficult corrosion, leakage and blockage, and is convenient to install and disassemble. The circulating outlet water after heat exchange of the heat exchange device is conveyed to a drainage pool through a residual heat recycling return pipe to be discharged or used for other purposes.

In practical application, the following innovations are provided:

(1) the first water conveying pipeline 4 and the second water conveying pipeline 5 are coated with heat insulation materials 6.

Specifically, the first water conveying pipeline 4 and the second water conveying pipeline 5 can be made of PVC materials, slow heat dissipation is mainly considered, the heat preservation materials 6 are coated outside the first water conveying pipeline and the second water conveying pipeline, heat preservation of the exposed part in winter can be achieved, and other materials can be used as long as heat preservation is well achieved.

(2) The first water conveying pipeline 4 and the second water conveying pipeline 5 both have certain gradients; electromagnetic emptying valves 7 are mounted on the low position sides of the first water conveying pipeline 4 and the second water conveying pipeline 5, and safety valves 8 are mounted on the high position sides of the first water conveying pipeline and the second water conveying pipeline.

Specifically, in order to avoid freezing caused by water stored in the first water conveying pipeline 4 and the second water conveying pipeline 5, the first water conveying pipeline 4 and the second water conveying pipeline 5 need to have slopes, for example, 0.03%, each water conveying pipeline is matched with an electromagnetic emptying valve 7 and a safety valve 8, water needs to be emptied and stored during pump shutdown or failure, the safety valve 8 at the top of the pipeline needs to be ventilated, and the electromagnetic emptying valve 7 at the bottom of the pipeline discharges water.

(3) The first water conveying pipeline 4 is provided with a water inlet temperature thermometer 9; the second water conveying pipeline 5 is provided with an outlet water temperature thermometer 10.

Through water temperature thermometer 9 and play water temperature thermometer 10 of intaking, business turn over temperature and the difference in temperature can be looked over, and then obtain the heat transfer effect, can suitably adjust circulating water pump 3 according to the heat transfer effect open the stop cycle, reach optimum heat transfer effect, when the difference in temperature is little to a certain extent, for example when 2, 3 degrees, can think that the heat transfer is not significant, can stop the heat transfer.

(4) A first flange joint 11 is arranged at a water inlet of the heat exchange device 1 and is used for being communicated with and arranged on the first water pipeline 4; and a second flange joint 12 is arranged at the water outlet of the heat exchange device 1 and is used for being communicated with the second water pipeline 5.

Specifically, heat transfer device 1 adopts stainless steel tubular product, and the radiating effect is good, and is difficult to corrode, and the cost is low, and other materials are all can satisfying under the prerequisite of heat transfer effect. The heat exchange device 1 can be prefabricated or processed in groups in a factory, so that the heat exchange device is convenient to assemble and install in a pool, and the joints of the water inlet and the water outlet of the heat exchange device 1 are respectively provided with a flange joint, so that the heat exchange device is convenient to connect with the water inlet and outlet joint of an external water pipeline. Has the advantage of convenient installation.

(5) The preheating water tank, the heating water tank, the biochemical treatment tank and the middle water tank are connected in series;

the water level of the communicating hole between the middle water tank and the drainage tank is higher than the high liquid level set by the liquid level meter; the middle water tank and the drainage tank are not communicated under normal conditions; only when the circulating water pump 3 fails and cannot drain water or direct drainage is temporarily required (such as direct drainage when heating is not required in summer), water is drained through the communication hole.

The invention also provides a method for the distributed waste heat recycling heating energy-saving system for the effluent of the sewage station, which comprises the following steps:

the liquid level in pond in the middle of the 2 real-time detection of level gauge to through opening of middle pond liquid level control circulating water pump 3 and stop the action, it is specific:

when the liquid level of the middle water tank reaches a preset high liquid level, the circulating water pump 3 acts to continuously pump warm water in the middle water tank into the heat exchange device 1 of the preheating water tank through the first water conveying pipeline 4 to exchange heat with sewage entering the preheating water tank;

after heat exchange, the temperature of the sewage in the preheating water tank rises, the sewage enters the heating water tank to be heated to a set temperature, the sewage enters the biochemical treatment tank to be subjected to biochemical treatment, and the treated warm water is discharged to the intermediate water tank;

after heat exchange, the temperature of the water in the heat exchange device 1 is reduced, and the water is discharged to a drainage pool through a second water pipeline 5;

the discharge capacity of the circulating water pump 3 is determined according to the average water inflow of the intermediate water tank, and one water inflow period is controlled to realize uniform water pumping, so that the heat exchange device 1 achieves the optimal heat exchange effect;

when detecting that middle pond liquid level reaches and predetermineeing low liquid level, circulating water pump 3 stops, when treating that middle pond liquid level reaches and predetermineeing high liquid level, restarts again, so relapse, realizes the play water of biochemical treatment pond exhaust higher temperature, pumps heat transfer device 1 to the front end through circulating water pump 3, makes the temperature of intaking that enters into the preheating water pool rise, utilizes the surplus temperature retrieval and utilization to rise the temperature of intaking, reduces the energy consumption.

One embodiment is described below:

the distributed waste water temperature recycling heating energy-saving system provided by the invention is used for the rural sewage treatment project of a certain town of Qinghai in winter by combining with a figure 3, the integrated equipment is buried, two sets of biochemical treatment pools are parallel, the effluent of the biochemical treatment pools are respectively pumped into a heat recycling water storage tank (namely an intermediate pool) by corresponding self-sucking pumps, the volume of the heat recycling water storage tank is matched with the effluent of the self-sucking pumps per hour, the circulating pump is ensured to uniformly and continuously pump the effluent with higher temperature of about 20 ℃ into a heat exchange coil of a front-end pretreatment pool, the influent with low temperature of about 4 ℃ in the pretreatment pool is subjected to heat exchange to about 12 ℃, the influent flows into a rear-end heating pool automatically and is heated to the proper water temperature for biological treatment, such as 20 ℃. The 12-degree effluent water after heat exchange in the heat exchange coil of the pretreatment tank flows into a landscape tank (equivalent to a drainage tank) to be drained.

Wherein, install level gauge, high-order overflow pipe and low level drain pipe in the hot retrieval and utilization water storage tank, the level gauge opens and stops as aforementioned control circulating pump, and high-order overflow pipe overflows to the clean water basin when trouble or water yield are big, and low level drain pipe is used for overhauing or trouble drainage.

When the residual heat is not needed to be returned in summer, the two self-sucking pumps directly discharge the effluent of the biochemical treatment tank into the landscape tank through the flow dividing valve.

Other electromagnetic emptying valves and safety valves are as described above, and can empty the accumulated water in the reuse pipeline to prevent freezing when the electromagnetic emptying valve is not used.

The project is used in winter (11 months to 4 months in the next year, nearly six months, and 20 ℃ below zero at the lowest temperature), the effect is obvious, the heating energy consumption is reduced by nearly half, the economic burden of local town governments and villagers is greatly reduced, and as the temperature is suitable for the growth of microorganisms, the water quality is stably discharged up to the standard all the time in winter and is uniformly approved by local departments, the project becomes a typical demonstration point for treating the agricultural pollutants in the Qinghai and the Qinghai, and has great popularization value in the Qinghai and the northern regions.

The distributed waste heat recycling heating energy-saving system and the method for the water discharged from the sewage station have the following advantages that:

1. the problem of high energy consumption in sewage heating in alpine regions is solved, and 30-50% of heat energy can be utilized.

Through actual measurement in one month in winter, the average temperature of inlet water of the preheating water tank is 8 ℃, the temperature is increased by 4 ℃ after residual temperature recycling to 12 ℃ and is increased by 8 ℃ through heating of a heat source pump to 20 ℃ from data counted every day when residual temperature recycling starts to operate.

Before the residual temperature recycling is started, the average daily power consumption of the heat source pump is about 200 ℃. Since the effect of waste heat recycling is shown, the power consumption of the heat source pump is obviously reduced, the 15-day average daily power consumption is 135.7 ℃, and therefore, the energy consumption is saved by 64.3 ℃ every day, and the energy is saved by 32.1%.

2. Because the energy consumption is greatly reduced, the application and popularization value is higher.

In the past, because of high power consumption, high operation and maintenance cost and heavy burden on governments or residents, a plurality of sewage treatment schemes cannot be implemented due to low temperature, so that the effluent in most northern areas cannot reach the standard in winter.

3. The technology is not limited by the process, any process can be added, the process or structure change is not needed, the structure is simple, the technical requirement is low, the transformation or investment cost is extremely low, the maintenance is basically not needed, and the effect is obvious.

4. The main components are as follows: circulating pump, circulating line and heat transfer device, processing is convenient, and the general market of material all can purchase the configuration, and the construction is simple, and constructor does not need higher qualification.

5. The technical process is simple, the installation and the operation are convenient, independent equipment does not need to be built or the device is buried under a frozen soil layer deeply, and the engineering quantity is small.

6. The control logic is simple, the start and stop of the pump are controlled only by the participation of the upper liquid level and the lower liquid level, and a simple controller or a local PLC (programmable logic controller) is accessed.

7. The invention ingeniously circulates the wastewater discharged from the biochemical treatment tank to the front end for heat exchange, realizes the utilization of the heat energy of the wastewater discharged from the biochemical treatment tank, has extremely low energy consumption in circulation, very obvious energy-saving effect, environmental protection, accordance with the low-carbon concept, strong practicability and huge social and economic benefits, is very suitable for the popularization and application of biotechnology sewage treatment in alpine regions, and greatly changes the appearance of dispersed sewage treatment in northern regions.

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.