Municipal sludge drying device based on renewable energy sources

Abstract

The utility model discloses a municipal sludge drying device based on renewable energy sources, which comprises a drying shed, a drying layer is arranged at the bottom of the drying shed, a hot water heat exchange pipeline is laid below the drying layer, an air circulation system used for air heating and deodorization is assembled on the upper portion of the drying shed, and the air circulation system is connected with the drying shed. A double-glass photovoltaic assembly is arranged on the top of the drying shed. The sewage source heat pump is used for extracting waste heat energy of sewage to heat circulating water, a drying heat source is provided for sludge in the greenhouse to dry the sludge, meanwhile, harmful gas in generated dehydrated air can be treated, the whole sludge treatment process is simple, and the treatment cost is low.

Description

Technical Field

[0001] The utility model relates to a municipal sludge drying device based on renewable energy, belonging to the technical field of environmental protection equipment. Background Art

[0002] With the rapid economic development and the acceleration of urbanization, the amount of urban sewage treatment in my country has shown an increasing trend. In 2021, the output of urban sludge was 54.69 million tons (based on a water content of 80%), but its harmless treatment volume was only 36 million tons, and the harmless disposal volume was only 28 million tons. In 2025, the output of urban sludge in my country will reach 67 million tons (based on a water content of 80%), the harmless treatment rate will be 70%, and the harmless disposal rate will be 65%. It can be seen that sludge treatment and resource utilization in my country is still one of the environmental problems that need to be solved urgently.

[0003] Traditional sludge treatment methods have problems such as complex process flow, large amount of reagents added, high energy consumption and high treatment cost. In recent years, efficient use of clean energy has become one of the important ways and means for sewage treatment plants to reduce pollution and carbon emissions and increase efficiency. How to make full use of the remaining construction space of sewage treatment plants, arrange distributed photovoltaic power generation systems, and reduce the consumption and dependence on municipal electricity has become a key issue for sewage treatment plants to reduce costs and increase efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a municipal sludge drying device based on renewable energy, which brings a more efficient, environmentally friendly and economical technical route and implementation plan to solve the technical problems of sludge treatment and resource utilization.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a municipal sludge drying device based on renewable energy, comprising a drying shed, a drying layer is arranged at the bottom of the drying shed, hot water heat exchange pipes are laid under the drying layers, an air circulation system for air heating and deodorization is installed on the upper part of the drying shed, and a double-glass photovoltaic module is arranged on the roof of the drying shed.

[0006] The aforementioned municipal sludge drying device based on renewable energy also includes a heat exchanger, the output end of the heat exchanger is connected to the input end of the hot water heat exchange pipe, and the input end of the heat exchanger and the output end of the hot water heat exchange pipe are connected to the sewage treatment plant.

[0007] The aforementioned municipal sludge drying device based on renewable energy, the air circulation system includes a Roots blower, the output end of the Roots blower is connected to an air inlet duct, the output end of the air inlet duct is connected to the air input end of the heater, the air output end of the heater is connected to the drying shed, an exhaust duct is provided on the top of the side wall of the drying shed, the output end of the exhaust duct is connected to the input end of a wet air cooler, the output end of the wet air cooler is connected to the input end of a biological deodorization device, and the output end of the biological deodorization device is connected to the air inlet duct.

[0008] In the aforementioned municipal sludge drying device based on renewable energy, the heat medium input end of the heater is connected to the input end of the heat exchanger, and the heat medium output end of the heater is connected to the sewage treatment plant.

[0009] In the aforementioned municipal sludge drying device based on renewable energy, the refrigerant water of the wet air cooler is taken from a sewage treatment plant, and the wet air cooler is also provided with a condensed water outlet.

[0010] The aforementioned municipal sludge drying device based on renewable energy, wherein a deep sludge feeding screw is arranged on the side wall of the drying shed.

[0011] In the aforementioned municipal sludge drying device based on renewable energy, a dry sludge discharging spiral is arranged on the side wall of the drying shed.

[0012] The aforementioned municipal sludge drying device based on renewable energy, the double-glass photovoltaic module includes photovoltaic cells, glass, and EVA film, the glass is two layers, the photovoltaic cells are placed between the two layers of glass, and the photovoltaic cells and the glass are fixed with EVA film.

[0013] The aforementioned municipal sludge drying device based on renewable energy, wherein the glass is ultra-white tempered glass.

[0014] The aforementioned municipal sludge drying device based on renewable energy, wherein a sludge turning device is provided at the bottom of the drying shed and is placed on the upper surface of the drying layer.

[0015] Compared with the prior art, the utility model utilizes the waste heat energy of sewage extracted by the sewage source heat pump to heat the circulating water, thereby providing a drying heat source for the sludge in the greenhouse, so that the sludge can be dried. At the same time, the harmful gases in the generated dehydrated air can be treated. The overall sludge treatment process is simple and the treatment cost is low. The utility model also effectively utilizes the construction space, arranges a distributed photovoltaic system on the roof of the greenhouse, and the radiant heat of the photovoltaic backplane provides thermal energy for the sludge in the greenhouse. The double-glass photovoltaic modules are used, and the backplane glass can prevent the photovoltaic modules from being corroded by the methane generated by the sludge drying, thereby increasing the service life of the photovoltaic modules. The design is optimized according to the sludge drying needs, and the utilization rate of solar energy is improved to power the entire system, which is more efficient, economical and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the double-glass photovoltaic module of the utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of a double-glass photovoltaic module of the present utility model.

[0019] Reference numerals:

[0020] 1-drying shed, 2-photovoltaic cells, 3-glass, 4-EVA film, 5-heat exchanger, 6-exhaust duct, 7-biological deodorization device, 8-condensate outlet, 9-air inlet duct, 10-dry mud discharge screw, 11-hot water heat exchange pipe, 12-Roots blower, 13-heater, 14-wet air cooler, 15-deep sludge feeding screw, 16-drying layer, 17-sludge turning device.

[0021] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0022] Embodiment 1 of the utility model: A municipal sludge drying device based on renewable energy, including a drying shed 1, a drying layer 16 is arranged at the bottom of the drying shed 1, a hot water heat exchange pipe 11 is laid under the drying layer 16, the sludge laid on the drying layer 16 can exchange heat with the hot water heat exchange pipe 11 to evaporate the moisture in the sludge, the upper part of the drying shed 1 is equipped with an air circulation system for air heating and deodorization, harmful gases in the dehydrated air are treated, the air is heated at the same time, and the sludge drying process is strengthened by convection, the roof of the drying shed 1 is arranged with double-glass photovoltaic modules, the construction space is effectively utilized, the double-glass photovoltaic modules are adopted to increase the service life of photovoltaics, and the design is optimized according to the sludge drying needs to improve the utilization rate of solar energy and power the entire system.

[0023] In the sludge treatment process, the residual sludge in the secondary sedimentation tank of the sewage treatment plant and the chemical sludge in the high-density sedimentation tank (water content of about 97%) are transported by a screw pump, and after adding a small amount of flocculant polyacrylamide PAM seasoning, they are transported to the sludge dehydration integrated machine. First, the sludge moisture content is reduced to 80%-84% after the first-level dehydration using a stacked screw dehydrator, and then enters the second-level dehydration high-pressure belt machine. The tension of the filter belt squeezes and shears the sludge, squeezes out the water in the sludge layer, and obtains sludge with a moisture content of 60-70%. The deeply dehydrated sludge is transported to the sludge drying shed through the conveying screw, and the deeply dehydrated sludge is spread on the drying layer 16. The sludge is on the drying layer 16 through the hot water laid under the layer. The heat exchange pipe 11 performs heat exchange. The circulating water of the hot water heat exchange pipe 11 comes from the effluent of the secondary sedimentation tank of the sewage treatment plant (recycled water). The wastewater source heat pump is used to extract the residual heat energy of the sewage to heat the circulating water, providing a drying heat source for the sludge in the shed. The humid hot air in the drying shed 1 is converted into dry hot air through the air circulation system. The clean dry hot air returns to the sludge drying shed 1, and the sludge drying process is enhanced by convection. A distributed photovoltaic system is arranged on the roof of the drying shed 1, and double-glass photovoltaic modules are used. The radiant heat of the photovoltaic backplane provides thermal energy for the sludge in the shed. The double-glass design improves the utilization of the remaining construction space on the roof, reduces the vertical height between the backplane and the sludge, enhances the thermal effect, and increases the temperature at the bottom of the shed by 3 to 5°C.

[0024] Embodiment 2 of the present utility model: A municipal sludge drying device based on renewable energy, comprising a drying shed 1, a drying layer 16 is arranged at the bottom of the drying shed 1, a hot water heat exchange pipe 11 is laid under the drying layer 16, the sludge laid on the drying layer 16 can exchange heat with the hot water heat exchange pipe 11 to evaporate the moisture in the sludge, the upper part of the drying shed 1 is equipped with an air circulation system for air heating and deodorization, harmful gases in the dehydrated air are treated, the air is heated at the same time, and the sludge drying process is strengthened by convection, the roof of the drying shed 1 is arranged with double-glass photovoltaic modules, the construction space is effectively utilized, the double-glass photovoltaic modules are adopted to increase the service life of photovoltaics, and the design is optimized according to the sludge drying needs to improve the utilization rate of solar energy and power the entire system. It also includes a heat exchanger 5, the output end of the heat exchanger 5 is connected to the input end of the hot water heat exchange pipe 11, the input end of the heat exchanger 5 and the output end of the hot water heat exchange pipe 11 are connected to the sewage treatment plant, the circulating water in the heat exchanger 5 comes from the effluent (recycled water) of the secondary sedimentation tank of the sewage treatment plant, and the waste heat energy of the sewage is extracted by a sewage source heat pump to heat the circulating water.

[0025] Embodiment 3 of the present utility model: A municipal sludge drying device based on renewable energy, comprising a drying shed 1, a drying layer 16 is arranged at the bottom of the drying shed 1, a hot water heat exchange pipe 11 is laid under the drying layer 16, the sludge laid on the drying layer 16 can exchange heat with the hot water heat exchange pipe 11 to evaporate the moisture in the sludge, the upper part of the drying shed 1 is equipped with an air circulation system for air heating and deodorization, harmful gases in the dehydrated air are treated, the air is heated at the same time, and the sludge drying process is strengthened by convection, the roof of the drying shed 1 is arranged with double-glass photovoltaic modules, the construction space is effectively utilized, the double-glass photovoltaic modules are adopted to increase the service life of photovoltaics, and the design is optimized according to the sludge drying needs to improve the utilization rate of solar energy and power the entire system. It also includes a heat exchanger 5, the output end of the heat exchanger 5 is connected to the input end of the hot water heat exchange pipe 11, the input end of the heat exchanger 5 and the output end of the hot water heat exchange pipe 11 are connected to the sewage treatment plant, the circulating water in the heat exchanger 5 comes from the effluent (recycled water) of the secondary sedimentation tank of the sewage treatment plant, and the waste heat energy of the sewage is extracted by a sewage source heat pump to heat the circulating water.

[0026] The air circulation system includes a Roots blower 12, the output end of the Roots blower 12 is connected to an air inlet duct 9, the output end of the air inlet duct 9 is connected to the air input end of a heater 13, the air output end of the heater 13 is connected to the drying shed 1, an exhaust duct 6 is provided on the top of the side wall of the drying shed 1, the output end of the exhaust duct 6 is connected to the input end of a wet air cooler 14, the output end of the wet air cooler 14 is connected to the input end of a biological deodorization device 7, the output end of the biological deodorization device 7 is connected to the air inlet duct 9, the heat medium input end of the heater 13 is connected to the input end of a heat exchanger 5, the heat medium output end of the heater 13 is connected to a sewage treatment plant, the refrigerant water of the wet air cooler 14 is taken from the sewage treatment plant, and the wet air cooler 14 is also provided with a condensate outlet 8. The hot and humid air in the drying shed 1 is extracted through the exhaust duct 6, and first enters the wet air cooler 14 to discharge condensed water. The refrigerant water of the wet air cooler 14 is taken from the effluent of the secondary sedimentation tank of the sewage treatment plant (recycled water), and is converted from hot and humid air to dehydrated air. Then it enters a separately arranged biological deodorization device 7, or is directly incorporated into the biological deodorization system of the sewage treatment plant to treat harmful gases in the dehydrated air. Subsequently, the clean dehydrated air enters the heater 13. The heater 1 uses sewage source heat pump hot water to heat the deodorized dehydrated air to convert it into dry hot air. Finally, the clean dry hot air returns to the drying shed 1, and the sludge drying process is enhanced by convection. The air circulation system controls the air volume and flow rate through a variable frequency fan.

[0027] Embodiment 4 of the present utility model: A municipal sludge drying device based on renewable energy, comprising a drying shed 1, a drying layer 16 is arranged at the bottom of the drying shed 1, a hot water heat exchange pipe 11 is laid under the drying layer 16, the sludge laid on the drying layer 16 can exchange heat with the hot water heat exchange pipe 11 to evaporate the moisture in the sludge, the upper part of the drying shed 1 is equipped with an air circulation system for air heating and deodorization, harmful gases in the dehydrated air are treated, the air is heated at the same time, and the sludge drying process is strengthened by convection, the roof of the drying shed 1 is arranged with double-glass photovoltaic modules, the construction space is effectively utilized, the double-glass photovoltaic modules are adopted to increase the service life of photovoltaics, and the design is optimized according to the sludge drying needs to improve the utilization rate of solar energy and power the entire system. It also includes a heat exchanger 5, the output end of the heat exchanger 5 is connected to the input end of the hot water heat exchange pipe 11, the input end of the heat exchanger 5 and the output end of the hot water heat exchange pipe 11 are connected to the sewage treatment plant, the circulating water in the heat exchanger 5 comes from the effluent (recycled water) of the secondary sedimentation tank of the sewage treatment plant, and the waste heat energy of the sewage is extracted by the sewage source heat pump to heat the circulating water, and a deep sludge feeding screw 15 is arranged on the side wall of the drying shed 1 for conveying the sludge into the drying shed 1, and a dry mud discharging screw 10 is arranged on the side wall of the drying shed 1 for discharging the dried sludge from the drying shed 1.

[0028] Embodiment 5 of the present utility model: A municipal sludge drying device based on renewable energy, comprising a drying shed 1, a drying layer 16 is arranged at the bottom of the drying shed 1, a hot water heat exchange pipe 11 is laid under the drying layer 16, the sludge laid on the drying layer 16 can exchange heat with the hot water heat exchange pipe 11 to evaporate the moisture in the sludge, the upper part of the drying shed 1 is equipped with an air circulation system for air heating and deodorization, harmful gases in the dehydrated air are treated, the air is heated at the same time, and the sludge drying process is strengthened by convection, the roof of the drying shed 1 is arranged with double-glass photovoltaic modules, the construction space is effectively utilized, the double-glass photovoltaic modules are adopted to increase the service life of photovoltaics, and the design is optimized according to the sludge drying needs to improve the utilization rate of solar energy and power the entire system. It also includes a heat exchanger 5, the output end of the heat exchanger 5 is connected to the input end of the hot water heat exchange pipe 11, the input end of the heat exchanger 5 and the output end of the hot water heat exchange pipe 11 are connected to the sewage treatment plant, the circulating water in the heat exchanger 5 comes from the effluent (recycled water) of the secondary sedimentation tank of the sewage treatment plant, and the waste heat energy of the sewage is extracted by the sewage source heat pump to heat the circulating water, and a deep sludge feeding screw 15 is arranged on the side wall of the drying shed 1 for conveying the sludge into the drying shed 1, and a dry mud discharging screw 10 is arranged on the side wall of the drying shed 1 for discharging the dried sludge from the drying shed 1.

[0029] In order to effectively utilize the construction space, a distributed photovoltaic system is arranged on the roof. The distributed photovoltaic system adopts a double-glass photovoltaic module, which includes a photovoltaic cell 2, glass 3, and EVA film 4. The glass 3 is two layers, and the photovoltaic cell 2 is placed between the two layers of the glass 3. The photovoltaic cell 2 and the glass 3 are fixed with EVA film 4, and the glass 3 is ultra-white tempered glass. The radiant heat of the photovoltaic backplane provides heat energy for the sludge in the drying shed 1. The backplane glass 3 can avoid being corroded by the methane generated by the sludge drying, and improve the service life of the photovoltaic. It is optimized according to the sludge drying requirements, improves the utilization rate of solar energy, and supplies power to the entire system. The double-glass design improves the utilization of the remaining construction space on the roof, reduces the vertical height between the backplane and the sludge, enhances the thermal effect, and increases the temperature at the bottom of the greenhouse by 3 to 5°C.

[0030] Specifically, a sludge turning device 17 placed on the upper surface of the drying layer 16 is provided at the bottom of the drying shed 1 to evenly spread the deeply dehydrated sludge fragments on the drying layer 16 in the drying shed 1. The sludge turning device 17 moves along the track to turn over the sludge fragments to improve the heat transfer efficiency.

[0031] The working principle of an embodiment of the utility model: during use, the utility model delivers the deeply dehydrated sludge to the sludge drying shed 1 through the conveying screw 15, and the deeply dehydrated sludge fragments are evenly spread on the drying layer 16 in the drying shed 1. The sludge turning device 17 moves along the track to turn over the sludge fragments to improve the heat transfer efficiency. The sludge exchanges heat on the drying layer 16 through the hot water heat exchange pipe 11 laid under the layer. The circulating water of the hot water heat exchange pipe 11 comes from the effluent (recycled water) of the secondary sedimentation tank of the sewage treatment plant. The waste heat energy of the sewage is extracted by the sewage source heat pump to heat the circulating water, providing a drying heat source for the sludge in the shed; the hot and humid air in the drying shed 1 is extracted through the exhaust duct 6, and first enters the wet air cooler 14 to discharge condensed water. The refrigerant water of the wet air cooler 14 is taken from the effluent (recycled water) of the secondary sedimentation tank of the sewage treatment plant. The air is converted into dehydrated air, and then enters a separately arranged biological deodorization device 7, or is directly incorporated into the biological deodorization system of the sewage treatment plant to treat harmful gases in the dehydrated air. Subsequently, the clean dehydrated air enters the heater 13. The heater 1 uses hot water from a sewage source heat pump to heat the dehydrated air after deodorization, so that it is converted into dry hot air. Finally, the clean dry hot air returns to the drying shed 1, and the sludge drying process is enhanced by convection. The air circulation system controls the air volume and flow rate through a variable frequency fan; a distributed photovoltaic system is arranged on the roof of the drying shed 1, and double-glass photovoltaic modules are used. The radiant heat of the photovoltaic backplane provides thermal energy for the sludge in the shed. The double-glass design improves the utilization of the remaining construction space on the roof, reduces the vertical height between the backplane and the sludge, enhances the thermal effect, and increases the temperature at the bottom of the shed by 3 to 5°C; the dried sludge is discharged and transported through the dry mud discharge spiral 10.

Claims

1. A municipal sludge drying device based on renewable energy, characterized in that: The invention comprises a drying shed (1), wherein a drying layer (16) is arranged at the bottom of the drying shed (1), a hot water heat exchange pipe (11) is laid under the drying layer (16), an air circulation system for air heating and deodorization is installed at the top of the drying shed (1), and a double-glass photovoltaic module is arranged on the roof of the drying shed (1).

2. A municipal sludge drying device based on renewable energy according to claim 1, characterized in that: It also comprises a heat exchanger (5), the output end of the heat exchanger (5) is connected to the input end of the hot water heat exchange pipe (11), and the input end of the heat exchanger (5) and the output end of the hot water heat exchange pipe (11) are connected to a sewage treatment plant.

3. A municipal sludge drying device based on renewable energy according to claim 2, characterized in that: The air circulation system comprises a Roots blower (12), the output end of the Roots blower (12) is connected to an air inlet duct (9), the output end of the air inlet duct (9) is connected to an air input end of a heater (13), the air output end of the heater (13) is connected to the inside of a drying shed (1), an exhaust duct (6) is arranged at the top of a side wall of the drying shed (1), the output end of the exhaust duct (6) is connected to an input end of a wet air cooler (14), the output end of the wet air cooler (14) is connected to an input end of a biological deodorization device (7), and the output end of the biological deodorization device (7) is connected to the air inlet duct (9).

4. A municipal sludge drying device based on renewable energy according to claim 3, characterized in that: The heat medium input end of the heater (13) is connected to the input end of the heat exchanger (5), and the heat medium output end of the heater (13) is connected to the sewage treatment plant.

5. A municipal sludge drying device based on renewable energy according to claim 3, characterized in that: The refrigerant water of the wet air cooler (14) is taken from a sewage treatment plant, and the wet air cooler (14) is also provided with a condensed water outlet (8).

6. A municipal sludge drying device based on renewable energy according to claim 1 or 2, characterized in that: A deep sludge feeding screw (15) is arranged on the side wall of the drying shed (1).

7. A municipal sludge drying device based on renewable energy according to claim 1 or 2, characterized in that: A dry mud discharging screw (10) is arranged on the side wall of the drying shed (1).

8. A municipal sludge drying device based on renewable energy according to claim 1 or 2, characterized in that: The double-glass photovoltaic module comprises a photovoltaic cell (2), glass (3), and an EVA adhesive film (4); the glass (3) is two layers, the photovoltaic cell (2) is placed between the two layers of glass (3), and the photovoltaic cell (2) and the glass (3) are fixed by using the EVA adhesive film (4).

9. A municipal sludge drying device based on renewable energy according to claim 8, characterized in that: The glass (3) is ultra-white tempered glass.

10. The municipal sludge drying device based on renewable energy according to claim 1, characterized in that: The bottom of the drying shed (1) is provided with a sludge turning device (17) placed on the upper surface of the drying layer (16).

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