Energy-saving efficient combined sludge drying equipment for sewage treatment plant

Abstract

The utility model provides energy-saving high-efficiency combined sludge drying equipment for a sewage treatment plant, which comprises a disc drying machine comprising a first-stage drying treatment area and a second-stage drying treatment area, sludge enters the second-stage drying treatment area after being primarily treated by the first-stage drying treatment area, and the sludge enters the second-stage drying treatment area after being treated by the second-stage drying treatment area; the water content of the sludge in the secondary drying treatment area is relatively low after primary treatment, so that the temperature of gas discharged after sludge treatment in the secondary drying treatment area is relatively high and relatively dry, and the gas discharged from the secondary drying treatment area is introduced into the primary drying treatment area to be reused at the moment, so that the energy utilization rate is increased, and the treatment efficiency is optimized. Meanwhile, according to the equipment, waste heat is recycled from gas with waste heat discharged from the first-stage drying treatment area through a heat cycle assembly, the influence on the environment is reduced, and effective utilization of resources is achieved. Therefore, the equipment can realize cyclic utilization of the heat energy, so that the energy is saved, and the cost is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge drying, in particular to energy-saving and high-efficiency combined sludge drying equipment for sewage treatment plants. Background Art

[0002] Sludge drying, also known as sludge dehydration, refers to the process of removing most of the water content from sludge through filtration or evaporation, generally using self-evaporation facilities such as sludge drying plants. After the sludge is concentrated, physical methods are used to further reduce the water content of the sludge to facilitate the transportation, accumulation, utilization or further treatment of the sludge.

[0003] At present, the sludge produced by most municipal sewage treatment plants in my country has a moisture content of about 80%. According to the sludge inspection report, when the sludge has a moisture content of 82%, its low calorific value is only 1.528MJ / kg, and its calorific value is very low, so it is impossible to achieve self-combustion disposal. In addition to its composition, the calorific value of the sludge entering the furnace is mainly related to the moisture content of the sludge. When the moisture content of the sludge is high, the heat generated by its incineration cannot meet the heat absorbed by the evaporation of its water, so the sludge cannot self-sustaining combustion. If the moisture content of the sludge is reduced and the calorific value of the sludge is increased, the heat generated by its unit weight incineration will increase. When its calorific value reaches the low calorific value of the sludge self-sustaining combustion, it can self-sustaining combustion. Even if it is burned in conjunction with other combustibles, due to the high moisture content and too little low calorific value, only a very small amount of 80% sludge can be used for mixing and burning, and the disposal capacity is naturally constrained by conditions. Therefore, further reducing the moisture content of the sludge has become the direction of people's efforts, and then finding a feasible means to dispose of sludge in large quantities.

[0004] In the prior art, sludge disc dryers are mostly used for sludge drying. Disc dryers generally use steam as a heat source, and steam has become a major component of system operating costs. The steam heat source is used to dry the sludge in the container through the coil, and the sludge with a moisture content of 80% is dried to a moisture content of 30%. However, the gas with residual heat from the dryer in the prior art is directly discharged after it comes out of the gas outlet of the dryer, and cannot be used again, resulting in a certain amount of energy waste. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides an energy-saving and efficient combined sewage treatment plant sludge drying equipment, which solves the problem in the prior art that the gas with waste heat from the dryer is directly discharged from the gas outlet of the dryer and cannot be reused, resulting in a certain amount of energy waste.

[0006] A energy-saving and efficient combined sewage treatment plant sludge drying equipment, comprising: a disc dryer, the disc dryer comprising a dryer housing and a primary drying treatment area and a secondary drying treatment area arranged in the dryer housing, the sludge outlet of the primary drying treatment area is connected to the sludge inlet of the secondary drying treatment area, and the air outlet of the secondary drying treatment area is connected to the air inlet of the primary drying treatment area; a heat circulation component, comprising a dust collector, a heater, and an evaporator, a compressor, a condenser, a liquid storage tank and an expansion valve circulated through a pipeline, the air inlet end of the dust collector is connected to the air outlet end of the primary drying treatment area, the air outlet end of the dust collector is connected to the evaporator, the air inlet end of the heater is connected to the air outlet end of the condenser, and the air outlet end of the heater is connected to the air inlet end of the secondary drying treatment area.

[0007] Preferably, a water scrubber is provided between the dust collector and the evaporator. The provision of the water scrubber enables further removal of pollutants such as particulate matter and gaseous pollutants in the exhaust gas from the exhaust end of the dust collector, thereby effectively purifying the exhaust gas and reducing pollution to the environment. At the same time, the provision of the water scrubber can also prevent pollutants from entering subsequent equipment such as the evaporator, protect its normal operation, and extend the service life of the equipment.

[0008] Preferably, the primary drying treatment area and the secondary drying treatment area are both provided with a driving assembly, a rotating shaft connected to the driving assembly and arranged in the drying machine housing, and a plurality of groups of discs arranged outside the rotating shaft.

[0009] Preferably, the driving assembly includes a driving motor, a synchronous wheel is arranged on the output shaft of the driving motor, a driven wheel is arranged at the end of the rotating shaft corresponding to the synchronous wheel, and a driving belt is arranged between the synchronous wheel and the driven wheel.

[0010] Furthermore, the disc comprises a plurality of large discs and a plurality of small discs arranged from top to bottom, the large discs and the small discs are arranged at intervals, and the large discs and the small discs are provided with stirring components with opposite bending directions.

[0011] Furthermore, the stirring component is an arc-shaped stirring component.

[0012] Furthermore, the large disc and the small disc are both provided with a plurality of ventilation holes.

[0013] Preferably, the heater comprises a heater housing and a heating element arranged in the heater housing.

[0014] Preferably, an induced draft fan is provided between the condenser and the heater.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model provides an energy-saving and efficient combined sewage treatment plant sludge drying equipment, which includes a disc dryer and a heat cycle component; the disc dryer includes a primary drying treatment area and a secondary drying treatment area. After the sludge is preliminarily treated in the primary drying treatment area, it enters the secondary drying treatment area through the primary drying treatment area. The sludge in the secondary drying treatment area has a relatively low moisture content after the preliminary treatment. Therefore, the gas discharged after the sludge treatment in the secondary drying treatment area has a high temperature and is relatively dry. At this time, the gas discharged from the secondary drying treatment area is introduced into the primary drying treatment area for reuse, which improves the energy utilization rate and optimizes the treatment efficiency. At the same time, the equipment also recycles the waste heat of the gas with residual heat discharged from the primary drying treatment area through the heat cycle component and recycles it into the secondary drying treatment area, which reduces the impact on the environment and realizes the effective use of resources. Therefore, the energy-saving and efficient combined sewage treatment plant sludge drying equipment improves the energy utilization rate, optimizes the treatment efficiency, and can also realize the recycling of thermal energy, so that energy is saved, green and environmentally friendly, and the cost is correspondingly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the energy-saving and high-efficiency combined sewage treatment plant sludge drying equipment described in the utility model.

[0018] in:

[0019] 1-disc dryer, 10-primary drying treatment area, 30-secondary drying treatment area, 40-dust collector, 41-heater, 42-evaporator, 43-compressor, 44-condenser, 45-liquid storage tank, 46-expansion valve, 47-water washing tower, 50-dryer housing, 51-rotating shaft, 52-driving assembly, 53-large disc, 54-small disc, 55-stirring assembly, 56-ventilation hole. DETAILED DESCRIPTION

[0020] The embodiments described below are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1The present embodiment provides an energy-saving and efficient combined sewage treatment plant sludge drying equipment, which includes a disc dryer 1 and a heat circulation component. The disc dryer 1 includes a dryer housing 50 and a primary drying treatment area 10 and a secondary drying treatment area 30 arranged in the dryer housing 50, the sludge outlet of the primary drying treatment area 10 is connected to the sludge inlet of the secondary drying treatment area 30, and the air outlet of the secondary drying treatment area 30 is connected to the air inlet of the primary drying treatment area 10; the thermal cycle component includes a dust collector 40, a heater 41, and an evaporator 42, a compressor 43, a condenser 44, a liquid storage tank 45 and an expansion valve 46 circulated through a pipeline, the air inlet end of the dust collector 40 is connected to the air outlet end of the primary drying treatment area 10, the air outlet end of the dust collector 40 is connected to the exhaust gas inlet arranged on the housing of the evaporator 42, the air inlet end of the heater 41 is connected to the air outlet end of the condenser 44, and the air outlet end of the heater 41 is connected to the air inlet end of the secondary drying treatment area 30.

[0022] It should be noted that when the energy-saving and efficient combined sewage treatment plant sludge drying equipment of the present application is used, first, the sludge enters the primary drying treatment area 10 for preliminary treatment. In the primary drying treatment area 10, the sludge is subjected to high temperature and mechanical action, and part of the water begins to evaporate, so that the water content of the sludge is reduced. The treated sludge is transported from the sludge outlet of the primary drying treatment area 10 to the secondary drying treatment area 30 for further treatment. Due to the treatment in the primary drying treatment area 10, the sludge has a relatively low water content when entering the secondary drying treatment area 30. In the secondary drying treatment area 30, the sludge is subjected to higher temperature and more sufficient drying, so that its water content is further reduced, and the treated sludge is discharged through the mud outlet of the secondary drying treatment area 30. At the same time, the relatively high temperature and dry gas discharged after the secondary drying treatment area 30 treats the sludge enters the primary drying treatment area 10 to perform primary drying treatment on the sludge in the primary drying treatment area 10.

[0023] At the same time, the gas discharged from the primary drying treatment area 10 contains a certain temperature and heat, and the heat energy therein will be effectively utilized and recycled in the subsequent processing stage. Specifically, the gas discharged from the primary drying treatment area 10 enters the dust collector 40 to remove dust, and then the gas with dust removed enters the casing of the evaporator 42, and the working medium (usually evaporated refrigerant) in the evaporator 42 absorbs the heat in the exhaust gas. At the same time, the gas after the residual heat is absorbed is discharged through the exhaust gas outlet provided on the casing of the evaporator 42. Then the working medium that absorbs the residual heat in the evaporator 42 enters the compressor 43 in a low-pressure state, and the compressor 43 compresses the low-pressure, low-temperature working medium into a high-pressure, high-temperature gas, so that it can release more heat. Then the high-temperature and high-pressure working medium enters the condenser 44. The working medium in the condenser 44 releases heat, causing it to cool and condense into a liquid state. At the same time, the released heat is absorbed by the air entering the condenser 44. The air after absorbing heat reaches the heater 41 via the condenser 44. The heater 41 further heats the air after absorbing heat to a suitable temperature and introduces it into the secondary drying treatment area 30, thereby drying the sludge in the secondary drying treatment area 30.

[0024] Preferably, a water scrubber 47 is provided between the dust collector 40 and the evaporator 42. The provision of the water scrubber 47 enables further removal of pollutants such as particulate matter and gaseous pollutants in the exhaust gas from the outlet of the dust collector, thereby effectively purifying the exhaust gas and reducing pollution to the environment. At the same time, the provision of the water scrubber 47 can also prevent pollutants from entering subsequent equipment such as the evaporator 42, protect its normal operation, and extend the service life of the equipment. It should be noted that in the present application, an induced draft fan can be connected to the end of the water scrubber 47 so that the exhaust gas can be discharged from the water scrubber faster, thereby allowing more waste heat to be preserved. At the same time, the water scrubber 47 uses efficient adsorption materials or washing liquids to absorb pollutants to the greatest extent, while also minimizing the loss of waste heat in the exhaust gas. When in use, the gas discharged from the primary drying treatment area 10 enters the dust collector 40 to remove dust, and then the gas from which the dust is removed enters the water scrubber 47, and the gas treated by the water scrubber 47 enters the compressor 43, and then performs subsequent operations.

[0025] Preferably, the primary drying treatment area 10 and the secondary drying treatment area 30 are both provided with a driving assembly 52, a rotating shaft 51, and a plurality of groups of discs arranged outside the rotating shaft 51. One end of the rotating shaft 51 is connected to the output end of the driving assembly 52, and the other end of the rotating shaft 51 is rotatably connected to the rotary bearings arranged in the primary drying treatment area 10 and the secondary drying treatment area 30. When the driving assembly 52 is running, the rotating shaft 51 moves with the driving assembly 52, thereby driving the discs to move.

[0026] It should be noted that the primary drying treatment area 10 and the secondary drying treatment area 30 are both provided with a gas inlet and a gas outlet. Furthermore, the primary drying treatment area 10 and the secondary drying treatment area 30 are both provided with a sludge inlet and a sludge outlet, and the sludge inlet and the sludge outlet are both provided with electric valves to realize the control of sludge feeding and discharging. It should be noted that when the sludge outlet of the primary drying treatment area 10 comes out, the driving component 52 drives the rotating shaft 51 to rotate, and then drives the disc to move. At this time, the sludge is subjected to the extrusion force, and at the same time cooperates with the gravity of the sludge itself, so that it can smoothly enter the secondary drying treatment area 30.

[0027] In the present application, the driving assembly includes a driving motor, a synchronous wheel is arranged on the output shaft of the driving motor, a driven wheel is arranged at the end of the rotating shaft 51 corresponding to the synchronous wheel, and a driving belt is arranged between the synchronous wheel and the driven wheel.

[0028] Furthermore, the disc includes a plurality of large discs 53 and a plurality of small discs 54 arranged from top to bottom, the large discs 53 and the small discs 54 are arranged at intervals, and the large discs 53 and the small discs 54 are provided with stirring components 55 with opposite bending directions. After the sludge enters the disc dryer 1 from the feed port at the top of the disc dryer 1, it falls into the first disc (small disc 54), and after being stirred by the stirring component 55, the sludge moves to the outer surface of the disc, and then falls into the second disc (large disc 53); after the sludge falls from the small disc 54 into the large disc 53, it is gradually displaced along the surface of the large disc 53 by the action of the stirring component 55, and finally falls into the next small disc 54, and the cycle continues. This continuous displacement process helps the sludge to fully contact the heat source and improve the drying efficiency.

[0029] Furthermore, the stirring assembly 55 is an arc-shaped stirring assembly 55, and the arc-shaped bending directions of the arc-shaped stirring assembly 55 on the large disc 53 and the small disc 54 are opposite. Since the bending directions of the stirring assembly 55 on the large disc 53 and the small disc 54 are opposite, when the sludge passes through the disc, the movement of the stirring assembly 55 will produce a certain antagonistic effect, thereby increasing the stirring effect, which is beneficial to the full contact between the sludge and the heat source, and also helps to evenly distribute the sludge on the disc surface, promoting the drying effect.

[0030] Furthermore, a plurality of ventilation holes 56 are provided on the large disc 53 and the small disc 54. The provision of the ventilation holes 56 can enhance the ventilation effect inside the disc dryer 1. Through the ventilation holes 56, air can circulate more fully and transfer heat to the sludge evenly, thereby promoting the drying process of the sludge. This helps to improve the drying speed and efficiency of the sludge.

[0031] Preferably, the heater 41 includes a heater 41 shell and a heating element disposed in the heater 41 shell. In the present application, the heating element is an electric heating wire, so that the air entering the heater 41 can be heated.

[0032] Preferably, an induced draft fan is provided between the condenser 44 and the heater 41. By transferring hot air from the condenser 44 to the heater 41 through the induced draft fan, heat energy loss inside the system can be reduced, thereby reducing energy consumption.

[0033] The utility model provides an energy-saving and efficient combined sewage treatment plant sludge drying equipment, which includes a disc dryer 1 and a heat cycle component; the disc dryer 1 includes a primary drying treatment area 10 and a secondary drying treatment area 30. After the sludge is preliminarily treated in the primary drying treatment area 10, it enters the secondary drying treatment area 30 through the primary drying treatment area 10. The sludge in the secondary drying treatment area 30 has a relatively low moisture content after the primary drying treatment area 10. Therefore, the gas discharged from the secondary drying treatment area 30 after the sludge treatment is relatively high in temperature and relatively dry. At this time, the gas discharged from the secondary drying treatment area 30 is introduced into the primary drying treatment area 10 for reuse, thereby improving energy utilization and optimizing treatment efficiency. At the same time, the equipment also recycles the waste heat of the gas with residual heat discharged from the primary drying treatment area 10 through the heat cycle component, thereby reducing the impact on the environment and realizing the effective utilization of resources. Therefore, this energy-saving and high-efficiency combined sewage treatment plant sludge drying equipment improves energy utilization, optimizes treatment efficiency, and can also realize the recycling of thermal energy, thereby saving energy, being green and environmentally friendly, and reducing costs accordingly.

[0034] The above disclosures are only several preferred embodiments of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. An energy-saving and efficient combined sewage treatment plant sludge drying equipment, Features: It contains: A disc dryer, comprising a dryer housing, and a primary drying treatment area and a secondary drying treatment area arranged in the dryer housing, wherein the sludge outlet of the primary drying treatment area is connected to the sludge inlet of the secondary drying treatment area, and the air outlet of the secondary drying treatment area is connected to the air inlet of the primary drying treatment area; A heat circulation component includes a dust collector, a heater, and an evaporator, a compressor, a condenser, a liquid storage tank and an expansion valve circulating through pipelines, wherein the air inlet end of the dust collector is connected to the air outlet end of the primary drying treatment area, the air outlet end of the dust collector is connected to the evaporator, the air inlet end of the heater is connected to the air outlet end of the condenser, and the air outlet end of the heater is connected to the air inlet end of the secondary drying treatment area.

2. The energy-saving and high-efficiency combined sewage treatment plant sludge drying equipment according to claim 1, It is characterized in that A water washing tower is arranged between the dust collector and the evaporator.

3. The energy-saving and high-efficiency combined sewage treatment plant sludge drying equipment according to claim 1, It is characterized in that The primary drying treatment area and the secondary drying treatment area are both provided with a driving assembly, a rotating shaft connected to the driving assembly and arranged in the drying machine housing, and a plurality of groups of discs arranged outside the rotating shaft.

4. The energy-saving and high-efficiency combined sewage treatment plant sludge drying equipment according to claim 3, It is characterized in that The driving assembly comprises a driving motor, a synchronous wheel is arranged on the output shaft of the driving motor, a driven wheel is arranged at the end of the rotating shaft corresponding to the synchronous wheel, and a driving belt is arranged between the synchronous wheel and the driven wheel.

5. The energy-saving and high-efficiency combined sewage treatment plant sludge drying equipment according to claim 3, It is characterized in that The discs include a plurality of large discs and a plurality of small discs arranged from top to bottom, the large discs and the small discs are arranged at intervals, and stirring components with opposite bending directions are arranged on the large discs and the small discs.

6. The energy-saving and high-efficiency combined sewage treatment plant sludge drying equipment according to claim 5, It is characterized in that The stirring component is an arc-shaped stirring component.

7. The energy-saving and high-efficiency combined sewage treatment plant sludge drying equipment according to claim 5, It is characterized in that The large disc and the small disc are both provided with a plurality of ventilation holes.

8. The energy-saving and high-efficiency combined sewage treatment plant sludge drying equipment according to claim 1, It is characterized in that The heater comprises a heater housing and a heating element arranged in the heater housing.

9. The energy-saving and high-efficiency combined sewage treatment plant sludge drying equipment according to claim 1, It is characterized in that An induced draft fan is arranged between the condenser and the heater.

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