Sludge classification drying treatment system

Abstract

The utility model discloses a sludge classification drying treatment system which comprises a sludge temporary storage box, a water content detection device, a high-water-content sludge drying box, a medium-water-content sludge drying box, a low-water-content sludge drying box, a conveying device A, a conveying device B, a conveying device C and a dried sludge storage device. The lower end of the sludge temporary storage box is provided with three output ports, each output port is provided with a control valve, and the control valve at the corresponding output port is controlled according to the water content result of the water content detection equipment; and the conveying equipment A, the conveying equipment B and the conveying equipment C respectively correspond to the high-water-content sludge drying box, the medium-water-content sludge drying box and the low-water-content sludge drying box. Through water content detection and targeted drying equipment configuration, efficient and environment-friendly treatment of sludge with different water contents is realized, the problems of a traditional sludge drying treatment system are effectively solved, and the technical progress of the sludge treatment industry is promoted.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of sludge drying treatment, and specifically relates to a sludge classified drying treatment system. BACKGROUND

[0002] With the acceleration of industrialization and urbanization, the sewage treatment capacity continues to grow, and the large amount of sludge generated has become an urgent environmental problem. Sludge is complex in composition, containing not only a large amount of organic matter, pathogens, but also heavy metals and toxic and harmful substances that are difficult to degrade. If not properly treated, sludge can cause serious pollution to soil, water and air, threatening the ecological environment and human health.

[0003] Sludge drying, as an important part of sludge treatment process, can effectively reduce the moisture content of sludge, reduce the volume of sludge and improve the feasibility of subsequent sludge treatment. Through drying treatment, the calorific value of sludge is improved, creating favorable conditions for incineration and other resource utilization methods, and also helping to reduce the risk of secondary pollution of sludge during storage and transportation.

[0004] However, most of the traditional sludge drying treatment systems use a single drying method, without fully considering the diversity of sludge moisture content. Sludge from different sources has a large difference in initial moisture content, from more than 90% to relatively low 60% or so. For high-moisture sludge, ordinary drying method is inefficient and energy-consuming; while for low-moisture sludge, excessive drying not only wastes energy, but also may affect the subsequent resource utilization performance of sludge. In addition, during the drying process, due to the lack of targeted treatment measures, harmful gases and odors are easy to cause environmental pollution, and the heat utilization efficiency in the drying process is not high, and the resource waste phenomenon is serious.

[0005] Under this background, it is of great practical significance to develop a system that can classify and dry sludge according to its moisture content, while having the characteristics of high efficiency, energy saving and environmental protection. UTILITY MODEL CONTENT

[0006] Therefore, in order to solve the above problems, the utility model provides a sludge classified drying treatment system, which aims to provide a new sludge classified drying treatment system, realizes efficient and environmentally friendly treatment of sludge with different moisture contents through moisture content detection and targeted drying equipment configuration, effectively solves the problems existing in the traditional sludge drying treatment system, and promotes the technological progress of sludge treatment industry.

[0007] The utility model discloses a sludge classification drying treatment system which is characterized in that: the system comprises a sludge temporary storage tank, a water content detection device for detecting the water content of sludge in the sludge temporary storage tank, a high water content sludge drying tank, a medium water content sludge drying tank, a low water content sludge drying tank, a conveying device A, a conveying device B, a conveying device C, and a dried sludge storage device; the sludge temporary storage tank has three outlets at the lower end of the tank body, and a control valve is arranged at each outlet and is in communication with the inlet end of the conveying device A, the conveying device B or the conveying device C; the control valve at the corresponding outlet is controlled according to the water content result of the water content detection device; and the conveying device A, the conveying device B or the conveying device C corresponds to the high water content sludge drying tank, the medium water content sludge drying tank or the low water content sludge drying tank, so that the sludge is connected to the corresponding drying tank for drying treatment, and the sludge is subjected to classification drying treatment.

[0008] According to the sludge classification drying treatment system, the high water content sludge drying tank is provided with a centrifugal dryer or a belt vacuum dryer.

[0009] The medium water content sludge drying tank is provided with a paddle dryer or a fluidized bed dryer.

[0010] The low water content sludge drying tank is provided with a disc dryer or a spray dryer.

[0011] According to the sludge classification drying treatment system, the system further comprises a ventilation system which is in communication with the high water content sludge drying tank, the medium water content sludge drying tank and the low water content sludge drying tank and is used for introducing fresh air into the sludge drying tank, so as to promote heat transfer and exchange, accelerate water evaporation and discharge, and reduce harmful gas accumulation and odor.

[0012] According to the sludge classification drying treatment system, the tail end of the high water content sludge drying tank, the medium water content sludge drying tank or the low water content sludge drying tank is provided with a cyclone separator, a condensation adsorption device and a waste gas purification device; dust is removed through the cyclone separator first, then the heat and moisture in the waste gas are recovered through the condensation adsorption device, the remaining waste gas is subjected to purification treatment, and the waste gas is discharged after reaching the standard.

[0013] The utility model has the following advantages: (1) accurate classification and efficient drying: the moisture content detection equipment is used for real-time monitoring of the moisture content of sludge in the sludge temporary storage box, and the opening and closing of the control valve at each output port is automatically controlled according to the detection result. For the newly transported sludge in the sludge temporary storage box, it can be transported to the corresponding high-moisture-content sludge drying box, medium-moisture-content sludge drying box or low-moisture-content sludge drying box according to the different moisture content of the sludge. This accurate classification processing method, combined with the dryers matched in each drying box, such as the centrifugal dryer or belt vacuum dryer in the high-moisture-content sludge drying box, the paddle dryer or fluidized bed dryer in the medium-moisture-content sludge drying box, and the disc dryer or spray dryer in the low-moisture-content sludge drying box, can fully utilize the advantages of various dryers, realize efficient drying of sludge with different moisture contents, greatly improve the drying efficiency, and reduce the drying time and energy consumption. (2) Improve drying quality and efficiency: sludge with different moisture contents is treated in the appropriate drying environment, avoiding the problems of over-drying or under-drying caused by improper drying method. For example, for high-moisture-content sludge, centrifugal dryers or belt vacuum dryers can effectively realize preliminary dewatering, laying a good foundation for further drying. Medium-moisture-content sludge is treated in paddle dryers or fluidized bed dryers, realizing uniform and efficient drying through sufficient heat transfer and stirring. Low-moisture-content sludge is deeply dried or shaped in disc dryers or spray dryers, ensuring stable quality of the dried sludge and meeting the requirements of subsequent incineration or other resource utilization. (3) Energy saving and environmental protection: the ventilation system is set to promote heat transfer and exchange when fresh air is introduced into each drying box, accelerating water evaporation and discharge, and reducing harmful gas accumulation and odor. This not only improves the drying efficiency, but also reduces the energy consumption. In addition, cyclone separators, condensation adsorption equipment and waste gas purification devices are arranged at the tail of the high-moisture-content sludge drying box, medium-moisture-content sludge drying box and low-moisture-content sludge drying box. Dust is removed by cyclone separators, heat and moisture are recovered by condensation adsorption equipment, and waste gas is purified and discharged after reaching the standard, realizing resource recycling and environmental protection treatment of waste, effectively reducing environmental pollution and energy waste. (4) Equipment cooperation and automatic operation: the components of the whole system, including the sludge temporary storage box, conveying equipment A, conveying equipment B, conveying equipment C and sludge drying and storage equipment, work cooperatively to form a high-automation sludge classification and drying process. The linkage control of the moisture content detection equipment and the control valve realizes automatic classification and transportation of sludge, reduces manual intervention, reduces labor intensity, improves the stability and reliability of the system operation. At the same time, the reasonable configuration of each drying box and subsequent treatment equipment ensures the continuity and efficiency of the whole drying process.(5) Strong adaptability and wide application: This system can adapt to the drying treatment needs of sludge from different sources and different water contents, whether it is sludge generated in municipal wastewater treatment plants or sludge generated in industrial wastewater treatment processes. It can be effectively treated through precise classification and adaptive drying methods. Its flexible equipment configuration and automated operation mode make it have good application prospects in sludge treatment projects of different scales, and the system size can be adjusted and optimized according to actual needs. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the present application.

[0015] Among them: sludge temporary storage tank 1, water content detection equipment 2, high water content sludge drying box 3, medium water content sludge drying box 4, low water content sludge drying box 5, conveying equipment A 6, conveying equipment B 7, conveying equipment C 8, dry sludge storage equipment 9, ventilation system 10, cyclone separator 11, condensation adsorption equipment 12, waste gas purification device 13. DETAILED DESCRIPTION

[0016] The embodiments of the present application will be described below with reference to the accompanying drawings. Figure 1 The embodiments of the present application will be described below with reference to the accompanying drawings.

[0017] The present application provides a sludge classification and drying treatment system, as shown in the following manner: Figure 1 The composition of the system includes: a sludge temporary storage tank 1, a water content detection device 2 for detecting the water content of the sludge in the sludge temporary storage tank 1, a high water content sludge drying box 3, a medium water content sludge drying box 4, a low water content sludge drying box 5, a conveying equipment A 6, a conveying equipment B 7, a conveying equipment C 8, and a dry sludge storage equipment 9; the lower end of the tank body of the sludge temporary storage tank 1 has three output ports, each of which is provided with a control valve, and is in communication with the inlet end of the conveying equipment A 6, the conveying equipment B 7 and the conveying equipment C 8 respectively, the control valve at the corresponding output port is controlled according to the water content result of the water content detection device 2 (the control function can be realized by a control system or a control device), and the conveying equipment A 6, the conveying equipment B 7 and the conveying equipment C 8 correspond to the high water content sludge drying box 3, the medium water content sludge drying box 4 and the low water content sludge drying box 5 respectively, so as to connect the sludge to the corresponding drying box for drying treatment, and realize classification and drying treatment of the sludge.

[0018] The system also includes a ventilation system 10 that communicates with the high-moisture sludge drying tank 3, the medium-moisture sludge drying tank 4, and the low-moisture sludge drying tank 5, respectively, for introducing fresh air into the sludge during drying. This promotes heat transfer and exchange, accelerates moisture evaporation and removal, and reduces harmful gas accumulation and odor.

[0019] The benefits of introducing fresh air during sludge drying are as follows:

[0020] (1) Promote heat transfer and exchange:

[0021] Improve drying efficiency: For equipment that uses heat conduction and heat convection for drying, such as paddle dryers and fluidized bed dryers, the introduction of fresh air can better carry heat to the sludge. In a paddle dryer, the paddle stirring allows the sludge to come into contact with the heated wall while the fresh air flows inside the equipment, quickly bringing the heat from the heated wall to all parts of the sludge, accelerating the heating and evaporation of moisture in the sludge, and thus improving the overall drying efficiency. In a fluidized bed dryer, hot air acts as a fluidizing medium, and fresh air is added to maintain the high temperature and high enthalpy of the hot air, ensuring that the sludge continuously and efficiently absorbs heat in a fluidized state, resulting in rapid drying.

[0022] Temperature uniformity: The flow of fresh air helps to balance the temperature distribution in the dryer. In a disc dryer, multiple heating discs heat the sludge, and the introduction of fresh air can evenly distribute the heat around each heating disc, preventing local overheating or undercooling, ensuring uniform heating of the sludge throughout the drying process, improving drying quality, and preventing over-drying or under-drying of some sludge due to uneven temperature.

[0023] (2) Accelerate moisture evaporation and removal:

[0024] Lower humidity: Fresh air has a lower relative humidity, and when it enters the dryer, it can lower the local water vapor partial pressure in the dryer. For example, in a belt vacuum dryer, although the boiling point of water is lowered in a vacuum environment, the water vapor concentration in the dryer will increase as drying progresses. At this time, the introduction of fresh air can replace the high-humidity air, creating more favorable conditions for water evaporation, accelerating the diffusion rate of water from the surface of the sludge to the gas phase, and promoting further dewatering of the sludge.

[0025] Carry away water vapor: Fresh air directly participates in the water vapor transport during the drying process, quickly carrying the evaporated water out of the dryer. In a spray dryer, low-moisture sludge is sprayed into a hot gas stream in the form of mist, and fresh air not only provides heat but also acts as a carrier to quickly remove the evaporated water vapor, preventing the accumulation of water vapor in the dryer and affecting the drying effect and the formation of subsequent sludge particles.

[0026] (3) Reduce harmful gas accumulation and odor:

[0027] Oxidative decomposition: During the drying process, sludge can release harmful gases such as hydrogen sulfide, ammonia, and odor substances. Oxygen in fresh air can react with some harmful gases, converting them into relatively harmless substances. For example, hydrogen sulfide can be oxidized to sulfur dioxide under the action of oxygen, which can be further removed by reacting with alkaline substances, thereby reducing harmful gas emissions and improving the working environment and surrounding air quality.

[0028] Dilution effect: The introduction of a large amount of fresh air can dilute the concentration of harmful gases and odor substances in the dryer, reducing their impact on the health of operating personnel. In centrifugal dryers and other equipment, odor gases generated during sludge dewatering can be diluted by fresh air, reducing their concentration below the odor threshold and reducing the impact of odors on the surrounding environment.

[0029] (4) Ensure the safety of equipment operation:

[0030] Prevent dust explosion: During the drying process, sludge may produce dust, which can easily explode when it reaches the explosion limit in a certain space and encounters a fire source. The continuous introduction of fresh air can reduce the concentration of dust, keeping it below the explosion limit. At the same time, the flow of fresh air can also remove static electricity generated during equipment operation, reducing the risk of dust explosion caused by static electricity accumulation and ensuring the safe operation of the drying equipment, which is particularly important in equipment such as fluidized bed dryers that may generate more dust.

[0031] Reduce equipment corrosion: The flow of fresh air helps to reduce the accumulation of corrosive gases in the dryer, such as acidic gases released during the drying process of acidic substances contained in sludge. By introducing fresh air, these acidic gases can be promptly removed, reducing the corrosiveness of the internal environment of the equipment, prolonging the service life of the drying equipment, and reducing equipment maintenance costs.

[0032] In the implementation of the present application; the high-moisture sludge drying box 3, the medium-moisture sludge drying box 4, and the low-moisture sludge drying box 5 are respectively provided with a cyclone separator 11, a condensation adsorption device 12, and a waste gas purification device 13; usually first remove dust through the cyclone separator, then use the condensation adsorption device to recover heat and moisture, and purify the remaining waste gas, which is discharged after meeting the standards.

[0033] The following describes the links of the sludge drying process:

[0034] Inlet: The sludge to be dried is stored in the sludge temporary storage tank 1, and the moisture content of the sludge in the sludge temporary storage tank 1 is detected by the moisture content detection device 2. If the moisture content is > 80%, the C outlet at the bottom of the sludge temporary storage tank 1 is controlled to be opened, so that the sludge enters the high-moisture sludge drying tank 3 for drying. If the moisture content is between 60%-80%, the B outlet at the bottom of the sludge temporary storage tank 1 is controlled to be opened, so that the sludge enters the medium-moisture sludge drying tank 4 for drying. If the moisture content is < 60%, the A outlet at the bottom of the sludge temporary storage tank 1 is controlled to be opened, so that the sludge enters the low-moisture sludge drying tank 5 for drying. The conveying equipment involved can be a belt conveyor, a screw conveyor, etc.

[0035] Outlet: When the sludge is dried to the target moisture content, it is discharged from the outlet of the drying equipment. A screw conveyor, a scraper conveyor, etc. can be used to convey the dried sludge to subsequent treatment or storage equipment.

[0036] Tail gas treatment: The tail gas discharged during drying contains water vapor, a small amount of dust, and possibly odor substances. Generally, the dust is first removed by a cyclone separator, a bag filter, etc., and then the heat and moisture in it are recovered by condensation, adsorption, etc. The remaining waste gas is purified and treated, and discharged after reaching the standard.

[0037] During drying, the high-moisture sludge drying tank 3 is provided with a centrifugal dryer or a belt vacuum dryer; the medium-moisture sludge drying tank 4 is provided with a paddle dryer or a fluidized bed dryer; and the low-moisture sludge drying tank 5 is provided with a disc dryer or a spray dryer.

[0038] High-moisture sludge (moisture content > 80%):

[0039] Centrifugal dryer: The centrifugal force generated by high-speed rotation is used to quickly separate the water and solids in the sludge. The horizontal screw centrifuge has a large processing capacity and can quickly reduce the moisture content of the sludge, thereby reducing the load of subsequent drying. It is suitable for preliminary dewatering of a large amount of high-moisture sludge and can be placed after the sludge dewatering device 2 and before the drying device 10.

[0040] Belt vacuum dryer: In a vacuum environment, a heating plate is used to heat the sludge conveyed by a conveyor belt. The water boiling point of high-moisture sludge is reduced in a vacuum state, and the evaporation is accelerated. This equipment has a large processing capacity and is suitable for continuous processing of a large amount of high-moisture sludge. It can work cooperatively with the drying device 10.

[0041] Medium-moisture sludge (moisture content between 60%-80%):

[0042] Paddle dryer: The internal paddle stirring makes the sludge fully contact with the heated wall surface, and through heat conduction, efficiently promotes the evaporation of water. Because of its large heat transfer area and uniform stirring, it can effectively utilize heat, and is suitable for medium moisture content sludge, and can be used as the core equipment of the drying device 10.

[0043] Fluidized bed dryer: With hot air as the fluidizing medium, the sludge is in a fluidized state and quickly contacts the hot air to realize heat transfer and water evaporation. It has strong adaptability to sludge and fast drying speed, and is suitable for the case where the drying time is required and the moisture content of the sludge is in the medium range, and can be used for the drying device 10.

[0044] Low-moisture sludge (moisture content < 60%):

[0045] Disc dryer: composed of multiple heating discs, the sludge slowly turns on the heating disc, and is deeply dried through heat conduction. It has high heat transfer efficiency and low energy consumption, and can be used as the last fine drying equipment when the moisture content of the sludge is reduced to below 60%, to meet the strict requirements of incineration on the moisture content of the sludge.

[0046] Spray dryer: The low-moisture sludge is sprayed into a mist into a hot air stream, and the water is evaporated instantaneously. It is suitable for scenes where the particle form of the dried sludge is required, such as making pellet fuel, and can be used in the later stage of the drying device 10.

[0047] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sludge classification and drying treatment system, characterized by; The system comprises: a sludge temporary storage tank (1), a water content detection device (2) for detecting the water content of the sludge in the sludge temporary storage tank (1), a high-water-content sludge drying tank (3), a medium-water-content sludge drying tank (4), a low-water-content sludge drying tank (5), conveying equipment A (6), conveying equipment B (7), conveying equipment C (8), and a dried sludge storage device (9); the lower end of the tank body of the sludge temporary storage tank (1) has three outlets, each of which is provided with a control valve and is in communication with the inlet end of the conveying equipment A (6), the conveying equipment B (7), and the conveying equipment C (8), respectively; the control valves at the corresponding outlets are controlled according to the water content results of the water content detection device (2), and the conveying equipment A (6), the conveying equipment B (7), and the conveying equipment C (8) correspond to the high-water-content sludge drying tank (3), the medium-water-content sludge drying tank (4), and the low-water-content sludge drying tank (5), respectively, so as to connect the sludge to the corresponding drying tank for drying treatment, thereby realizing classified drying treatment of the sludge.

2. The sludge classification and drying system of claim 1, wherein: The high-water-content sludge drying tank (3) is provided with a centrifugal dryer or a belt vacuum dryer; The medium-water-content sludge drying tank (4) is provided with a paddle dryer or a fluidized bed dryer; The low-water-content sludge drying tank (5) is provided with a disc dryer or a spray dryer.

3. The sludge classification and drying system of claim 1, wherein: The system further comprises a ventilation system (10) in communication with the high-water-content sludge drying tank (3), the medium-water-content sludge drying tank (4), and the low-water-content sludge drying tank (5) respectively, for introducing fresh air into the sludge drying tank.

4. The sludge classification and drying system of claim 1, wherein; The tail ends of the high-water-content sludge drying tank (3), the medium-water-content sludge drying tank (4), and the low-water-content sludge drying tank (5) are respectively provided with a cyclone separator (11), a condensation adsorption device (12), and a waste gas purification device (13); dust is removed through the cyclone separator first, then the heat and moisture in the waste gas are recovered through the condensation adsorption device, and the remaining waste gas is purified and treated, and discharged after reaching the standard.

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