Bath sewage waste heat coupling air compressor waste heat utilization device

Abstract

The utility model relates to the technical field of waste heat utilization, in particular to a bathing sewage waste heat coupling air compressor waste heat utilization device, which has remarkable economic benefits, can enjoy all energy-saving and emission-reducing benefits, effectively reduces the dependence of a bathing water supply system on brick factory steam, and improves the stability of the bathing water supply system. Comprising a bath sewage waste heat coupling air compressor waste heat utilization technology; the utility model relates to a bath sewage waste heat coupling air compressor waste heat utilization technology which is composed of three subsystems including a bath sewage filtering system, a cold water heating system and a bath water supply system.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of waste heat utilization, in particular to bathing sewage waste heat coupling air compressor waste heat utilization device. BACKGROUND

[0002] At present, in order to rectify environmental pollution, manage atmospheric pollution, gradually ban coal-fired boiler in all walks of life, and green and environment-friendly heat pump unit is widely used.

[0003] In the existing bathing sewage waste heat coupling air compressor waste heat utilization device, for example, the bathing sewage waste heat utilization system of application sewage heat exchanger disclosed in the utility model patent with application No. 201822043852.5, the utility model utilizes sewage heat exchanger to preheat the water source of heat pump unit, and the heat pump unit can operate without well drilling, and the purpose of bathing sewage waste heat utilization is achieved, and heat waste is reduced; the cleaning device draws sand to the sewage heat exchanger through the sand suction mechanism to clean the inside of the sewage heat exchanger, and the cost is low.

[0004] The coal mine industrial square has bathing water demand all the year round, for the preparation of bathing water, shower water is prepared by directly injecting steam into a water tank, and pool bathing is prepared by directly injecting steam into a bath pool, and there are problems of high energy consumption and dependence on external brick factory steam, etc., the coal mine industrial square can utilize clean heat sources including air compressor waste heat and bathing wastewater waste heat. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides the utility model has remarkable economic benefits, enjoys all energy saving and emission reduction benefits, effectively reduces the dependence of the bathing water supply system on brick factory steam, and improves the stability of the bathing water supply system.

[0006] The bathing sewage waste heat coupling air compressor waste heat utilization device of the utility model, including bathing sewage waste heat coupling air compressor waste heat utilization technology, the bathing sewage waste heat coupling air compressor waste heat utilization technology is composed of three subsystems of bathing sewage filtration system, cold water heating system and bathing water supply system, through recycling of external preheating, the utility model has remarkable economic benefits, enjoys all energy saving and emission reduction benefits, effectively reduces the dependence of the bathing water supply system on brick factory steam, and improves the stability of the bathing water supply system.

[0007] The preferred bathing sewage filtering system adds a first hair filter at the front end of the bathing sewage drain pipe, adds a gate valve at the end of the drain pipe, and guides the bathing sewage originally drained into the sewage well to a second hair filter. Then, the bathing sewage enters the sand tank filter after being pressurized by the water pump, and finally enters the water tank of the closed self-cleaning heat exchanger. The bathing sewage releases heat to the cold water in the coil pipe. The amount of sewage in the water tank increases over time. When the water level rises to the position of the overflow pipe, the bathing sewage will return to the drain pipe after the gate valve through the overflow pipe and be drained into the sewage well and finally into the domestic sewage treatment station. It can filter out 80% of the hair and further filter the hair. It can also filter out impurities such as silt and small dirt in the water.

[0008] The preferred bathing water supply system sends the 55℃ bathing water in the hot water tank to the bath or for showering through the water pump. The bathing water supply pump selects a full-automatic self-priming pipeline booster pump. In addition, an automatic temperature control device is installed on the cold water replenishment pipeline of the hot water tank to stabilize the water temperature at a suitable temperature and ensure the comfort of the staff's bathing.

[0009] The preferred cold water heating system heats the 15℃ cold water to 27℃ in the coil pipe of the closed self-cleaning heat exchanger through the water tank bathing sewage, and then sends it to the air compressor heat recovery unit after being pressurized by the water pump. After being heated to 55℃ by the high-temperature lubricating oil from the air compressor, it is delivered to the current 200m3 hot water tank through the pipeline. At present, the mineral content of the water used in the mining area is relatively high. After being heated to more than 50℃, it is easy to scale, which deteriorates the heat transfer of the heat exchanger and greatly reduces the heat transfer efficiency, causing serious waste of heat energy. In addition, the existence of scale will block the passage of the heat exchanger, increase the resistance of the system, and affect the normal operation of the system. Therefore, a scale inhibitor is installed on the water pipe before the air compressor heat recovery unit. Scale inhibitor (12g / ton of bathing water) is injected into the water. The scale inhibitor and the scale-forming cations Ca2+, Mg2+, Fe2+ in the water are chelated at a ratio of 1:500 to form a stable and soluble complex, which can effectively prevent these cations from reacting with scale-forming anions CO32-, SO42- to form carbonate scale and sulfate scale. The scale inhibitor is DES-M type scale and corrosion inhibitor. The scale inhibitor is composed of food-grade polyphosphate and synergist, has excellent chelating performance, and has good corrosion inhibition effect on carbon steel and copper. The scale inhibitor has strong scale inhibition and good corrosion inhibition effect, and can operate under ultra-high hardness and water temperature below 105℃.

[0010] Preferably, a closed self-cleaning heat exchanger (ZL202020164753.7, 202010088174.3) is used to heat 15℃ tap water to 27℃ by using 30℃ bathing sewage; then, an air compressor heat recovery unit is used to heat 27℃ tap water to more than 55℃ by using high-temperature oiling of the air compressor; the closed self-cleaning heat exchange technology is used to recover the waste heat of bathing sewage for bathing workers, and the fluctuation of water volume can be adjusted by using a water tank to ensure that the heat of bathing sewage is released as needed.

[0011] Preferably, the cold water heating system comprises a bathing sewage pipe network, a cold water heating pipeline, a bathing water supply pipeline, and a hot water tank cold water replenishment pipeline. The bathing sewage pipe network comprises a bathing sewage water supply pipeline and a bathing sewage overflow pipeline. The bathing sewage water supply pipeline is connected to the bathing sewage drain pipe before the gate valve, and then connected in sequence with a secondary hair filter, a bathing sewage pump, and a sand cylinder filter, and finally connected to the bathing sewage inlet of the closed self-cleaning heat exchanger. The bathing sewage overflow pipeline is connected to the bathing sewage outlet of the closed self-cleaning heat exchanger at the beginning, and connected to the bathing sewage drain pipe after the gate valve at the end. The cold water heating pipeline is connected to the tap water pipeline near the closed self-cleaning heat exchanger at the beginning, and then connected in sequence with the closed self-cleaning heat exchanger coil, a pressurized water pump, a scale inhibitor, and an air compressor heat recovery unit, and finally connected to the hot water tank. The bathing water supply pipeline is connected to the hot water tank outlet at the beginning, connected in sequence with a bathing water supply pump, and finally connected to the shower main pipeline and the bath in the bathroom. The hot water tank cold water replenishment pipeline is connected to the tap water supply pipeline, and an automatic temperature control device is installed thereon to ensure stable water temperature.

[0012] Preferably, the air compressor mainly comprises an air filter, a motor, a body, an oil-gas separator, a temperature controller, an oil filter, an oil cooler, an air cooler, and other parts. The recoverable heat includes three parts: first, the heat taken away by the circulating cooling water in the air cooler; second, the heat taken away by the circulating cooling water in the oil cooler; third, the heat released by the condensation of water vapor in the wet air in the air cooler; the heat released by the high-temperature lubricating oil in the oil cooler accounts for the highest proportion, accounting for 70%-75% of the input power of the air compressor. Therefore, the most economical heat recovery method for the air compressor is to install a heat recovery unit after the oil-gas separator to recover the heat in the high-temperature lubricating oil. This technology uses an external heat exchanger for heat exchange, which is not restricted by the performance of the air compressor, and the inlet water temperature of the heat exchanger can be appropriately reduced. Generally, natural water sources can be directly used, and the water supply temperature can reach more than 55℃. To improve the safety factor, the heat recovery unit is connected in series with the original cooling system. The lubricating oil is cooled in the heat recovery unit, and then enters the temperature controller to detect the oil temperature by using a temperature sensing element. If the oil temperature is higher than the set value, the lubricating oil should first enter the oil cooler for further cooling, and then enter the oil filter for filtration before entering the body. If the oil temperature is lower than the set value, the lubricating oil does not need to be further cooled and can directly enter the oil filter for filtration before entering the body.

[0013] Preferably, the main equipment of the reformed bathing water supply system includes air compressor heat recovery unit, closed self-cleaning heat exchanger, scale inhibitor, hair filter, sand tank filter, water pump, power distribution control system, the air compressor heat recovery unit is configured with four units, which are arranged in the air compressor room and correspond to the air compressor one by one, the closed self-cleaning heat exchanger is composed of a water tank and a heating coil, two units are selected, which can be arranged in the open space outside the sewage treatment station, or can be arranged in the open space on the south side of the air compressor room, the hair filter and the sand tank filter are selected according to the maximum hourly use of bathing water, and the remaining amount is considered, the treatment capacity is 50 m3 / h, the bathing water supply pump is arranged near the hot water pool, the first-stage hair filter is arranged in the bathroom, the second-stage hair filter, the bathing sewage pump, the pressurized water pump and the sand tank filter are arranged near the closed self-cleaning heat exchanger, and the power distribution control system can be arranged in the on-duty room of the staff bathroom, the main electrical equipment of the system includes the bathing sewage pump, the pressurized water pump and the bathing water supply pump, the total power consumption is 18 kW, the power supply is 330 VAC, 50 Hz, three-phase four-wire system, the automatic control system monitors the data including the oil inlet and outlet temperature, the heat recovery unit outlet water temperature, the hot water pool water temperature and liquid level, the closed self-cleaning heat exchanger water tank water temperature and liquid level, and the closed self-cleaning heat exchanger coil inlet and outlet water temperature; the linkage control includes dynamically supplementing cold water to the hot water pool according to the hot water pool water temperature, and dynamically controlling the pressurized water pump flow according to the heat recovery unit outlet water temperature, the bathing sewage pipe network size of the heat pipe network is DN125, the cold water heating pipeline size is DN65, and the bathing water supply pipeline size is DN125.

[0014] Compared with the prior art, the utility model has the beneficial effects that: through the recycling of external preheating, the utility model has significant economic benefits, enjoys all energy-saving and emission-reducing benefits, effectively reduces the dependence of the bathing water supply system on the steam of the brick factory, and improves the stability of the bathing water supply system. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is the bathing sewage waste heat coupling air compressor waste heat utilization technical process flow diagram of the utility model;

[0016] Fig. 2 is the air compressor waste heat recovery working flow chart of the utility model;

[0017] The attached diagram is labeled as follows: 1. Air compressor heat recovery unit; 2. Hot water tank; 3. Thermostatic valve; 4. Bath water supply pump; 5. Shower; 6. Bathtub; 7. Booster pump; 8. Water tank; 9. Coil; 10. Closed-loop self-cleaning heat exchanger; 11. Sand filter; 12. Bath sewage pump; 13. Secondary hair filter; 14. Gate valve one; 15. Bath sewage drain pipe; 16. Primary hair filter; 17. Scale inhibitor; 18. Electric motor; 19. Filter; 20. Control valve; 21. Machine body; 22. Safety valve; 23. Pressure maintaining valve; 24. Air cooler; 25. Oil-gas separator; 26. Heat recovery unit; 27. Gate valve two; 28. Thermostat; 29. ​​Oil cooler; 30. Oil filter. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0019] Example 1

[0020] like Figs. 1-2 As shown, the waste heat utilization device for bathing wastewater coupled with air compressor waste heat utilization includes the waste heat utilization technology for bathing wastewater coupled with air compressor waste heat utilization. The waste heat utilization technology for bathing wastewater coupled with air compressor waste heat utilization consists of three subsystems: a bathing wastewater filtration system, a cold water heating system, and a bathing water supply system.

[0021] The bath wastewater filtration system adds a primary hair filter at the front end of the bath wastewater drain pipe and a gate valve at the end of the drain pipe to divert the bath wastewater that was originally discharged into the sewage well to a secondary hair filter. Then, the bath wastewater is pressurized by a water pump and enters a sand filter. Finally, it enters the water tank of a closed self-cleaning heat exchanger. The bath wastewater releases heat to the cold water in the coil. The amount of wastewater in the water tank increases over time. When the water level rises to the position of the overflow pipe, the bath wastewater will return through the overflow pipe to the drain pipe after the gate valve, be discharged into the sewage well, and finally enter the domestic sewage treatment plant.

[0022] The bathing water supply system delivers 55°C bathing water from the hot water tank to the bath or for showering via a water pump. The bathing water supply pump is a fully automatic self-priming pipeline booster pump. In addition, an automatic temperature control device is installed on the cold water supply pipeline of the hot water tank.

[0023] The cold water heating system enters the coil of the closed self-cleaning heat exchanger through 15℃ cold water, is heated to 27℃ by the bathing sewage in the water tank, is then pressurized by the water pump and is sent to the air compressor heat recovery unit, is heated to 55℃ by the high-temperature lubricating oil from the air compressor, and is then delivered to the current 200m3 hot water tank through the pipeline. At present, the mineral content of the water used for life in the mining area is relatively high, and it is easy to scale after being heated to above 50℃, which causes the heat transfer of the heat exchanger to deteriorate and greatly reduces the heat transfer efficiency, resulting in serious waste of heat energy. In addition, the existence of scale will block the channel of the heat exchanger, increase the resistance of the system, and affect the normal operation of the system. In view of this, a scale inhibitor is installed on the water pipe before the air compressor heat recovery unit, and a scale inhibitor (12g / ton of bathing water) is injected into the water. The scale inhibitor and the scale-forming cations Ca2+, Mg2+, Fe2+ in the water are chelated at a ratio of 1:500 to form a stable and soluble complex, which can effectively prevent the cations from reacting with the scale-forming anions CO32-, SO42- to form carbonate scale and sulfate scale. The scale inhibitor uses DES-M type scale and corrosion inhibitor;

[0024] The closed self-cleaning heat exchanger (ZL202020164753.7, 202010088174.3) is used to heat 15℃ tap water to 27℃ by using 30℃ bathing sewage. Then, the air compressor heat recovery unit is used to heat 27℃ tap water to above 55℃ by using high-temperature lubricating oil of the air compressor.

[0025] The cold water heating system includes a bathing sewage pipe network, a cold water heating pipeline, a bathing water supply pipeline, and a hot water tank cold water replenishment pipeline. The bathing sewage pipe network includes a bathing sewage water supply pipeline and a bathing sewage overflow pipeline. The bathing sewage water supply pipeline is connected to the bathing sewage drainage pipe before the gate valve, and then sequentially connected to a two-stage hair filter, a bathing sewage pump, and a sand cylinder filter. The terminal is arranged above the bathing sewage inlet of the closed self-cleaning heat exchanger water tank. The bathing sewage overflow pipeline is connected to the bathing sewage outlet of the closed self-cleaning heat exchanger water tank at the beginning, and connected to the bathing sewage drainage pipe after the gate valve at the end. The cold water heating pipeline is connected to the tap water pipeline near the closed self-cleaning heat exchanger at the beginning, and then sequentially connected to the closed self-cleaning heat exchanger coil, a pressurized water pump, a scale inhibitor, and an air compressor heat recovery unit. The terminal is connected to the hot water tank. The bathing water supply pipeline is connected to the hot water tank outlet at the beginning, and then connected to the bathing water supply pump. The terminal is connected to the shower main pipeline and the bath in the bathroom. The hot water tank cold water replenishment pipeline is connected to the tap water supply pipeline, and an automatic temperature control device is installed thereon.

[0026] The air compressor mainly comprises an air filter, a motor, a body, an oil-gas separator, a temperature controller, an oil filter, an oil cooler, an air cooler and the like, and the heat that can be recycled includes three parts: first, the heat taken away by the circulating cooling water in the air cooler; second, the heat taken away by the circulating cooling water in the oil cooler; and third, the heat released by the condensation of water vapor in the wet air in the air cooler.

[0027] The main equipment of the modified bathing water supply system includes the air compressor heat recovery unit, the closed self-cleaning heat exchanger, the scale inhibitor, the hair filter, the sand tank filter, the water pump and the power distribution control system.

[0028] The present utility model has remarkable economic benefits, enjoys the whole energy-saving and emission-reducing benefits, effectively reduces the dependence of the bathing water supply system on the steam of the brick factory, and improves the stability of the bathing water supply system.

[0029] As shown in Fig. 1 and Fig. 2 , the bathing sewage waste heat coupling air compressor waste heat utilization device of the present utility model recovers the external waste heat in working.

[0030] The main function realized by the present utility model is that the present utility model has remarkable economic benefits, enjoys the whole energy-saving and emission-reducing benefits, effectively reduces the dependence of the bathing water supply system on the steam of the brick factory, and improves the stability of the bathing water supply system in the waste heat utilization working process.

[0031] The above merely is the preferred implementation manner of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A device for utilizing waste heat of air compressor coupled with waste heat of bathing sewage, characterized in that, The bathing sewage waste heat coupling air compressor waste heat utilization technology is composed of three subsystems of bathing sewage filtration system, cold water heating system and bathing water supply system. The bathing sewage filtration system adds a primary hair filter at the front end of the bathing sewage drain pipe and a gate valve at the end of the drain pipe. The bathing water supply system makes the 55℃ bathing water in the hot water pool be delivered to the bath pool or used for shower through the water pump, and the bathing water supply pump is a full-automatic self-suction pipeline booster pump. The cold water heating system includes bathing sewage pipe network, cold water heating pipeline, bathing water supply pipeline and hot water pool cold water makeup pipeline. The bathing sewage pipe network includes bathing sewage water supply pipeline and bathing sewage overflow pipeline. The bathing sewage water supply pipeline is connected to the bathing sewage drain pipe at the front end of the gate valve, and then connected to the secondary hair filter, bathing sewage pump and sand cylinder filter in sequence, and finally connected to the inlet of the closed self-cleaning heat exchanger water tank. The bathing sewage overflow pipeline is connected to the bathing sewage outlet of the closed self-cleaning heat exchanger water tank at the beginning, and then connected to the bathing sewage drain pipe at the rear end of the gate valve at the end. The cold water heating pipeline is connected to the tap water pipeline near the closed self-cleaning heat exchanger at the beginning, and then connected to the closed self-cleaning heat exchanger coil, booster pump, scale inhibitor and air compressor heat recovery unit in sequence, and finally connected to the hot water pool. The bathing water supply pipeline is connected to the hot water pool outlet at the beginning, and then connected to the bathing water supply pump, and finally connected to the shower main pipeline and bath pool in the bathroom. The hot water pool cold water makeup pipeline is connected to the tap water supply pipeline, and an automatic temperature control device is needed to be installed.

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