A low vacuum waste heat recovery integrated sludge drying method

Abstract

The present invention discloses a low-vacuum waste heat recovery integrated sludge drying method, which relates to the technical field of sludge drying, including: S1, using the initial raw mud to be processed to obtain tempered sludge; S2, performing filter press treatment on the tempered sludge to obtain high-water content sludge; S3, performing low-vacuum drying treatment on the high-water content sludge to obtain low-vacuum waste heat recovery integrated dried sludge. The present invention uses the technology of drying sludge in low temperature and vacuum environment to improve the sludge treatment efficiency, avoid the high energy loss caused by high-temperature heat source and reduce the operating cost; the present invention sets the parameters of the filter press device and the drying device according to the sludge characteristics to speed up the squeezing speed of water in the sludge, improve the sludge drying efficiency, shorten the drying time, and avoid the impact of a large amount of discharged overheated condensed water on the surrounding environment.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge drying, and in particular relates to a low vacuum waste heat recovery integrated sludge drying method. Background Art

[0002] Sludge is the end product of the sewage treatment process and an important source of pollution. If it is not treated, it will cause serious pollution to the atmosphere, water bodies and soil, and will also accelerate the spread of certain human diseases.

[0003] Among the numerous sludge treatment technologies, drying and incineration process is an important technology. Its basic process is to concentrate, dry and finally incinerate the sludge, and recover the heat energy generated by the incineration. The drying process is the key step of the process and the main energy consumer. At present, the process has problems such as high energy consumption and high operating costs. The dust generated during the drying and subsequent transmission processes is prone to cause environmental pollution. It has been difficult to adapt to the new situation and cannot meet the increasing amount of sludge and increasingly stringent environmental protection requirements.

[0004] In addition, in order to promote the use of clean energy, sewage treatment plants have begun to use heat pump systems to extract low-level heat energy for sludge drying processes. However, traditional heat pumps still have problems such as long drying cycles caused by low water supply temperature and low heat energy conversion rates, which results in additional energy consumption and increases operating costs. Therefore, a low-vacuum waste heat recovery integrated sludge drying method is urgently needed to address the deficiencies in existing technologies. Summary of the invention

[0005] The purpose of the present invention is to propose a low vacuum waste heat recovery integrated sludge drying method to solve the problems of high energy consumption, high operating cost, long cycle time and low efficiency in the drying process.

[0006] To achieve the above object, the present invention provides a low vacuum waste heat recovery integrated sludge drying method, comprising the following steps:

[0007] S1. Using the initial raw mud to be treated to obtain the conditioned sludge;

[0008] S2, performing filter press treatment on the conditioned sludge to obtain sludge with high water content;

[0009] S3. Performing low vacuum drying treatment on the high-water content sludge to obtain low vacuum waste heat recovery integrated drying sludge.

[0010] Optionally, obtaining the conditioned sludge by utilizing the initial raw sludge to be treated includes:

[0011] S1-1, using a flocculant to obtain initial conditioned sludge based on the initial raw sludge to be treated;

[0012] S1-2, using the initial conditioned sludge to obtain the moisture content, specific resistance, particle size and viscosity of the initial conditioned sludge as initial conditioned sludge characteristics;

[0013] S1-3, obtaining corresponding historical initial conditioned sludge characteristics according to the initial conditioned sludge characteristics;

[0014] S1-4. Determine whether the characteristics of the initial conditioned sludge are consistent with the characteristics of the historical initial conditioned sludge. If so, obtain the initial conditioned sludge as the conditioned sludge. Otherwise, obtain the initial conditioned sludge that is inconsistent with the characteristics of the historical initial conditioned sludge, add it to the initial raw mud to be processed, and return to S1-1.

[0015] Optionally, obtaining initial conditioned sludge by using a flocculant based on the initial raw sludge to be treated includes:

[0016] S1-1-1, using the initial raw mud to be processed to obtain the water content, specific resistance, particle size and viscosity of the initial raw mud to be dried;

[0017] S1-1-2, according to the specific resistance of the initial raw mud to be dried, obtaining a specific resistance threshold of the corresponding historical initial raw mud to be dried as a first specific resistance threshold;

[0018] S1-1-3, judging whether the specific resistance of the initial raw mud to be dried meets the first specific resistance threshold, if so, obtaining the moisture content, specific resistance, particle size and viscosity of the initial raw mud to be dried as the characteristics of the initial raw mud to be dried, and executing S1-1-4, otherwise, obtaining the initial raw mud to be dried as high-moisture content sludge, and directly executing S3;

[0019] S1-1-4, obtaining a target dosage of flocculant according to the characteristics of the initial raw mud to be dried;

[0020] S1-1-5. Obtaining initial conditioned sludge based on the target dose of flocculant and the initial raw sludge to be dried.

[0021] Optionally, performing filter press treatment on the conditioned sludge to obtain sludge with high moisture content includes:

[0022] S2-1, using the conditioned sludge to obtain the specific resistance, particle size and viscosity of the conditioned sludge as the conditioned sludge characteristics;

[0023] S2-2, obtaining initial parameters of the sludge filter press device according to the characteristics of the conditioned sludge;

[0024] S2-3. According to the initial parameters of the sludge filter press device, the sludge filter press device is used to perform filter press treatment on the tempered sludge to obtain the high-water content sludge.

[0025] Optionally, obtaining initial parameters of a sludge filter press device according to the conditioned sludge characteristics includes:

[0026] S2-2-1, using the conditioned sludge characteristics and the corresponding historical conditioned sludge characteristics to obtain a first particle size threshold, a first viscosity threshold, and a second viscosity threshold of the historical conditioned sludge as historical conditioned sludge characteristic thresholds;

[0027] S2-2-2. Obtaining initial parameters of the sludge filter press device according to the conditioned sludge characteristics and the historical conditioned sludge characteristic thresholds.

[0028] Optionally, obtaining the initial parameters of the sludge filter press device according to the conditioned sludge characteristics and the historical conditioned sludge characteristics threshold value includes:

[0029] S2-2-2-1, determining whether the specific resistance of the conditioned sludge is completely consistent with the first specific resistance threshold, if so, executing S2-2-2-2, otherwise, retaining the conditioned sludge consistent with the first specific resistance threshold, and using the conditioned sludge inconsistent with the first specific resistance threshold as the initial raw sludge to be processed, and returning to S1-1;

[0030] S2-2-2-2, determine whether the particle size of the conditioned sludge is completely consistent with the first particle size threshold, if so, execute S2-2-2-3, otherwise, retain the conditioned sludge consistent with the first particle size threshold, and use the conditioned sludge inconsistent with the first particle size threshold as the initial raw sludge to be processed, and return to S1-1;

[0031] S2-2-2-3, determining whether the viscosity of the conditioned sludge is completely consistent with the first viscosity threshold; if so, obtaining a first initial pressure and a first filter pressing time as initial parameters of the sludge filter pressing device according to the first specific resistance threshold, the first particle size threshold and the first viscosity threshold; otherwise, executing S2-2-2-4;

[0032] S2-2-2-4. Determine whether the viscosity of the tempered sludge is completely consistent with the second viscosity threshold. If so, obtain the second initial pressure and the second filtration time as the initial parameters of the sludge filter press device according to the first specific resistance threshold, the first particle size threshold and the second viscosity threshold. Otherwise, obtain the third initial pressure and the third filtration time as the initial parameters of the sludge filter press device according to the characteristics of the tempered sludge.

[0033] Optionally, performing low vacuum drying treatment on the high-water content sludge to obtain low vacuum waste heat recovery integrated dried sludge includes:

[0034] S3-1, using the high-water-content sludge to obtain the water content of the high-water-content sludge as a characteristic of the high-water-content sludge;

[0035] S3-2, obtaining the drying time process of the high-water-content sludge according to the characteristics of the high-water-content sludge;

[0036] S3-3, obtaining a first air volume, a first negative pressure and a first temperature parameter of the sludge drying device according to the drying time process of the high-water content sludge as first initial parameters of the sludge drying device;

[0037] S3-4. Based on the first initial parameters of the sludge drying device, the sludge drying device is used to perform low-vacuum drying treatment on the high-water content sludge to obtain the low-vacuum waste heat recovery integrated dried sludge.

[0038] Optionally, based on the first initial parameter of the sludge drying device, using the sludge drying device to perform low vacuum drying treatment on the high-water content sludge to obtain the low vacuum waste heat recovery integrated dried sludge includes:

[0039] S3-4-1. Obtain a regenerator, a primary condenser and a secondary condenser as waste heat recovery equipment;

[0040] S3-4-2, obtaining first dry cold and hot air by using the secondary condenser and the regenerator according to the recycled water source;

[0041] S3-4-3, using a heater to obtain second dry cold and hot air according to the first dry cold and hot air as a first energy source for the sludge drying device;

[0042] S3-4-4, using the sludge drying device to perform low-vacuum sludge drying treatment on the high-water content sludge to obtain low-water content sludge based on the first energy source of the sludge drying device and the first initial parameter of the sludge drying device;

[0043] S3-4-5, obtaining the low vacuum waste heat recovery integrated drying sludge according to the low moisture content sludge;

[0044] The regenerated water source is urban sewage, the recycled water source obtained by the conditioned sludge filter press treatment, and the water source recycled from industrial wastewater.

[0045] Optionally, obtaining the low vacuum waste heat recovery integrated drying sludge according to the low moisture content sludge includes:

[0046] S3-4-5-1. Obtaining the moisture content of the low-moisture-content sludge according to the low-moisture-content sludge;

[0047] S3-4-5-2. According to the moisture content of the low-moisture content sludge, a moisture content threshold corresponding to the historical low-moisture content sludge is obtained as a first moisture content threshold;

[0048] S3-4-5-3, judging whether the moisture content of the low-moisture sludge is completely consistent with the first moisture content threshold, if so, using the low-moisture sludge as the low-vacuum waste heat recovery integrated drying sludge, otherwise, obtaining the moisture content of the low-moisture sludge as the low-moisture sludge characteristic, and executing S3-4-5-4;

[0049] S3-4-5-4, obtaining the drying time process of the low-moisture sludge according to the characteristics of the low-moisture sludge;

[0050] S3-4-5-5, obtaining the second air volume, the second negative pressure and the second temperature parameters of the sludge drying device according to the drying time process of the low-moisture content sludge as the second initial parameters of the low-true sludge drying device;

[0051] S3-4-5-6, obtain the wet hot air and hot air waste heat of the low moisture content sludge;

[0052] S3-4-5-7, using the waste heat recovery equipment to obtain the third dry cold hot air according to the wet hot air of the low-moisture sludge and the waste heat of the hot air;

[0053] S3-4-5-8, using the heater to obtain fourth dry cold and hot air as a second energy source for the sludge drying device according to the third dry cold and hot air and the first dry cold and hot air;

[0054] S3-4-5-9, using the sludge drying device to perform low-vacuum drying treatment on the low-water content sludge according to the second energy source of the sludge drying device and the second initial parameter of the sludge drying device to obtain the dried sludge;

[0055] Among them, the humid hot air of the low-moisture content sludge is the wind energy generated after the low-vacuum sludge drying device performs low-vacuum drying treatment on the tempered sludge, and the hot air waste heat is the low-vacuum waste heat recovery integrated drying sludge obtained by using the low-vacuum sludge drying device to perform low-vacuum drying treatment on the tempered sludge.

[0056] Compared with the closest prior art, the present invention has the following beneficial effects:

[0057] The sludge drying device of the present invention obtains the drying time process according to the characteristics of high-water content sludge, and automatically adjusts the low vacuum degree and temperature parameters in the drying device, thereby achieving the purpose of saving heat energy and rapid drying. In addition, the sludge drying device can recover the waste heat of moist hot steam evaporated from the sludge, fully utilizes energy, and achieves the purpose of energy saving; the technology of using low temperature and vacuum environment to dry sludge in the present invention improves the sludge treatment efficiency, avoids the high energy loss caused by high-temperature heat source and reduces the operating cost; the parameters of the filter press device and the drying device are set according to the characteristics of the sludge, thereby accelerating the squeezing speed of water in the sludge, improving the drying efficiency of the sludge, shortening the drying time, and avoiding the impact of a large amount of discharged superheated condensed water on the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 The present invention is a flowchart of a low vacuum waste heat recovery integrated sludge drying method. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] The terms used in the embodiments of the present invention are only used to explain the specific embodiments of the present invention and are not intended to limit the present application.

[0062] Typical sludge thermal drying equipment includes paddle dryers, disc dryers and film dryers based on the principle of indirect heat transfer, and belt dryers, spray dryers and rotary sludge dryers based on the principle of direct heat transfer. Traditional sludge dryers directly dry the sludge, and the water content of the sludge is about 80%, resulting in high energy consumption for drying. Even if a heat pump is used in the drying process, the energy that can be saved is limited. Based on the traditional dryer and based on the characteristics of the sludge to be dried, the present invention first uses the corresponding sludge filter press device to preliminarily reduce the water content in the sludge, and then carries out the ordinary drying process to make full use of energy and achieve energy saving.

[0063] like Figure 1 As shown, the embodiment of the present application provides a low vacuum waste heat recovery integrated sludge drying method, comprising the following steps:

[0064] S1. Using the initial raw mud to be treated to obtain the conditioned sludge;

[0065] S2, performing filter press treatment on the conditioned sludge to obtain sludge with high water content;

[0066] S3. Performing low vacuum drying treatment on the high-water content sludge to obtain low vacuum waste heat recovery integrated drying sludge.

[0067] S1 specifically includes:

[0068] S1-1, using a flocculant to obtain initial conditioned sludge based on the initial raw sludge to be treated;

[0069] S1-2, using the initial conditioned sludge to obtain the moisture content, specific resistance, particle size and viscosity of the initial conditioned sludge as initial conditioned sludge characteristics;

[0070] S1-3, obtaining corresponding historical initial conditioned sludge characteristics according to the initial conditioned sludge characteristics;

[0071] S1-4. Determine whether the characteristics of the initial conditioned sludge are consistent with the characteristics of the historical initial conditioned sludge. If so, obtain the initial conditioned sludge as the conditioned sludge. Otherwise, obtain the initial conditioned sludge that is inconsistent with the characteristics of the historical initial conditioned sludge, add it to the initial raw mud to be processed, and return to S1-1.

[0072] S1-1 specifically includes:

[0073] S1-1-1, using the initial raw mud to be processed to obtain the water content, specific resistance, particle size and viscosity of the initial raw mud to be dried;

[0074] S1-1-2, according to the specific resistance of the initial raw mud to be dried, obtaining a specific resistance threshold of the corresponding historical initial raw mud to be dried as a first specific resistance threshold;

[0075] S1-1-3, judging whether the specific resistance of the initial raw mud to be dried meets the first specific resistance threshold, if so, obtaining the moisture content, specific resistance, particle size and viscosity of the initial raw mud to be dried as the characteristics of the initial raw mud to be dried, and executing S1-1-4, otherwise, obtaining the initial raw mud to be dried as high-moisture content sludge, and directly executing S3;

[0076] S1-1-4, obtaining a target dosage of flocculant according to the characteristics of the initial raw mud to be dried;

[0077] S1-1-5. Obtaining initial conditioned sludge based on the target dose of flocculant and the initial raw sludge to be dried.

[0078] In this embodiment, the first specific resistance threshold is set to <2.0×1012m / Kg. The flocculant is added to the initial raw mud to be dried in order to reduce the pressure and time required for the filter pressing process and reduce the moisture content of the sludge after the filter pressing.

[0079] S2 specifically includes:

[0080] S2-1, using the conditioned sludge to obtain the specific resistance, particle size and viscosity of the conditioned sludge as the conditioned sludge characteristics;

[0081] S2-2, obtaining initial parameters of the sludge filter press device according to the characteristics of the conditioned sludge;

[0082] S2-3. According to the initial parameters of the sludge filter press device, the sludge filter press device is used to perform filter press treatment on the tempered sludge to obtain the high-water content sludge.

[0083] S2-2 specifically includes:

[0084] S2-2-1, using the conditioned sludge characteristics and the corresponding historical conditioned sludge characteristics to obtain a first particle size threshold, a first viscosity threshold, and a second viscosity threshold of the historical conditioned sludge as historical conditioned sludge characteristic thresholds;

[0085] S2-2-2. Obtaining initial parameters of the sludge filter press device according to the conditioned sludge characteristics and the historical conditioned sludge characteristic thresholds.

[0086] In this embodiment, the first particle size threshold is set to <1mm, the first viscosity threshold is set to <500Mpa·s, and the second viscosity threshold μ is set to 500Mpa·s<μ<1000Mpa·s, wherein the first specific resistance threshold of the historically conditioned sludge varies according to actual conditions. For example, when filtering domestic sewage sludge, the specific resistance threshold can be initially set at about 1.0×1012m / Kg. However, if the sludge is produced from papermaking industrial wastewater, since it contains a large amount of complex components such as fibers, the specific resistance threshold may need to be set at 1.5-2.0×1012m / Kg.

[0087] S2-2-2 specifically includes:

[0088] S2-2-2-1, determining whether the specific resistance of the conditioned sludge is completely consistent with the first specific resistance threshold, if so, executing S2-2-2-2, otherwise, retaining the conditioned sludge consistent with the first specific resistance threshold, and using the conditioned sludge inconsistent with the first specific resistance threshold as the initial raw sludge to be processed, and returning to S1-1;

[0089] S2-2-2-2, determine whether the particle size of the conditioned sludge is completely consistent with the first particle size threshold, if so, execute S2-2-2-3, otherwise, retain the conditioned sludge consistent with the first particle size threshold, and use the conditioned sludge inconsistent with the first particle size threshold as the initial raw sludge to be processed, and return to S1-1;

[0090] S2-2-2-3, determining whether the viscosity of the conditioned sludge is completely consistent with the first viscosity threshold; if so, obtaining a first initial pressure and a first filter pressing time as initial parameters of the sludge filter pressing device according to the first specific resistance threshold, the first particle size threshold and the first viscosity threshold; otherwise, executing S2-2-2-4;

[0091] S2-2-2-4. Determine whether the viscosity of the tempered sludge is completely consistent with the second viscosity threshold. If so, obtain the second initial pressure and the second filtration time as the initial parameters of the sludge filter press device according to the first specific resistance threshold, the first particle size threshold and the second viscosity threshold. Otherwise, obtain the third initial pressure and the third filtration time as the initial parameters of the sludge filter press device according to the characteristics of the tempered sludge.

[0092] S3 specifically includes:

[0093] S3-1, using the high-water-content sludge to obtain the water content of the high-water-content sludge as a characteristic of the high-water-content sludge;

[0094] S3-2, obtaining the drying time process of the high-water-content sludge according to the characteristics of the high-water-content sludge;

[0095] S3-3, obtaining a first air volume, a first negative pressure and a first temperature parameter of the sludge drying device according to the drying time process of the high-water content sludge as first initial parameters of the sludge drying device;

[0096] S3-4. Based on the first initial parameters of the sludge drying device, the sludge drying device is used to perform low-vacuum drying treatment on the high-water content sludge to obtain the low-vacuum waste heat recovery integrated dried sludge.

[0097] S3-4 specifically includes:

[0098] S3-4-1. Obtain a regenerator, a primary condenser and a secondary condenser as waste heat recovery equipment;

[0099] S3-4-2, obtaining first dry cold and hot air by using the secondary condenser and the regenerator according to the recycled water source;

[0100] S3-4-3, using a heater to obtain second dry cold and hot air according to the first dry cold and hot air as a first energy source for the sludge drying device;

[0101] S3-4-4, using the sludge drying device to perform low-vacuum sludge drying treatment on the high-water content sludge to obtain low-water content sludge based on the first energy source of the sludge drying device and the first initial parameter of the sludge drying device;

[0102] S3-4-5, obtaining the low vacuum waste heat recovery integrated drying sludge according to the low moisture content sludge;

[0103] The regenerated water source is urban sewage, the recycled water source obtained by the conditioned sludge filter press treatment, and the water source recycled from industrial wastewater.

[0104] S3-4-5 specifically includes:

[0105] S3-4-5-1. Obtaining the moisture content of the low-moisture-content sludge according to the low-moisture-content sludge;

[0106] S3-4-5-2. According to the moisture content of the low-moisture content sludge, a moisture content threshold corresponding to the historical low-moisture content sludge is obtained as a first moisture content threshold;

[0107] S3-4-5-3, judging whether the moisture content of the low-moisture sludge is completely consistent with the first moisture content threshold, if so, using the low-moisture sludge as the low-vacuum waste heat recovery integrated drying sludge, otherwise, obtaining the moisture content of the low-moisture sludge as the low-moisture sludge characteristic, and executing S3-4-5-4;

[0108] S3-4-5-4, obtaining the drying time process of the low-moisture sludge according to the characteristics of the low-moisture sludge;

[0109] S3-4-5-5, obtaining the second air volume, the second negative pressure and the second temperature parameters of the sludge drying device according to the drying time process of the low-moisture content sludge as the second initial parameters of the low-true sludge drying device;

[0110] S3-4-5-6, obtain the wet hot air and hot air waste heat of the low moisture content sludge;

[0111] S3-4-5-7, using the waste heat recovery equipment to obtain the third dry cold hot air according to the wet hot air of the low-moisture sludge and the waste heat of the hot air;

[0112] S3-4-5-8, using the heater to obtain fourth dry cold and hot air as a second energy source for the sludge drying device according to the third dry cold and hot air and the first dry cold and hot air;

[0113] S3-4-5-9, using the sludge drying device to perform low-vacuum drying treatment on the low-water content sludge according to the second energy source of the sludge drying device and the second initial parameter of the sludge drying device to obtain the dried sludge;

[0114] Among them, the humid hot air of the low-moisture content sludge is the wind energy generated after the low-vacuum sludge drying device performs low-vacuum drying treatment on the tempered sludge, and the hot air waste heat is the low-vacuum waste heat recovery integrated drying sludge obtained by using the low-vacuum sludge drying device to perform low-vacuum drying treatment on the tempered sludge.

[0115] In this embodiment, the first moisture content threshold is set to <30%.

[0116] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0117] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0118] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0119] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A low vacuum waste heat recovery integrated sludge drying method, characterized in that: The specific steps include: S1. Using the initial raw mud to be treated to obtain the conditioned sludge; S2, performing filter press treatment on the conditioned sludge to obtain sludge with high water content; S3, performing low vacuum drying treatment on the high-water content sludge to obtain low vacuum waste heat recovery integrated drying sludge; The high-water content sludge is subjected to low-vacuum drying treatment to obtain low-vacuum waste heat recovery integrated drying sludge, which includes: S3-1, using the high-water-content sludge to obtain the water content of the high-water-content sludge as a characteristic of the high-water-content sludge; S3-2, obtaining the drying time process of the high-water-content sludge according to the characteristics of the high-water-content sludge; S3-3, obtaining a first air volume, a first negative pressure and a first temperature parameter of the sludge drying device according to the drying time process of the high-water content sludge as first initial parameters of the sludge drying device; S3-4, based on the first initial parameters of the sludge drying device, using the sludge drying device to perform low vacuum drying treatment on the high-water content sludge to obtain the low vacuum waste heat recovery integrated dried sludge; Based on the first initial parameter of the sludge drying device, using the sludge drying device to perform low vacuum drying treatment on the high moisture content sludge to obtain the low vacuum waste heat recovery integrated dried sludge includes: S3-4-1. Obtain a regenerator, a primary condenser and a secondary condenser as waste heat recovery equipment; S3-4-2, obtaining first dry cold and hot air by using the secondary condenser and the regenerator according to the recycled water source; S3-4-3, using a heater to obtain second dry cold and hot air according to the first dry cold and hot air as a first energy source for the sludge drying device; S3-4-4, using the sludge drying device to perform low-vacuum sludge drying treatment on the high-water content sludge to obtain low-water content sludge based on the first energy source of the sludge drying device and the first initial parameter of the sludge drying device; S3-4-5, obtaining the low vacuum waste heat recovery integrated drying sludge according to the low moisture content sludge; Wherein, the regenerated water source is urban sewage, the recycled water source obtained by the conditioned sludge filter press treatment, and the water source recycled from industrial wastewater; Obtaining the low vacuum waste heat recovery integrated drying sludge according to the low moisture content sludge includes: S3-4-5-1. Obtaining the moisture content of the low-moisture-content sludge according to the low-moisture-content sludge; S3-4-5-2. According to the moisture content of the low-moisture content sludge, a moisture content threshold corresponding to the historical low-moisture content sludge is obtained as a first moisture content threshold; S3-4-5-3, judging whether the moisture content of the low-moisture sludge is completely consistent with the first moisture content threshold, if so, using the low-moisture sludge as the low-vacuum waste heat recovery integrated drying sludge, otherwise, obtaining the moisture content of the low-moisture sludge as the low-moisture sludge characteristic, and executing S3-4-5-4; S3-4-5-4, obtaining the drying time process of the low-moisture sludge according to the characteristics of the low-moisture sludge; S3-4-5-5, obtaining the second air volume, the second negative pressure and the second temperature parameters of the sludge drying device according to the drying time process of the low-moisture content sludge as the second initial parameters of the low-true sludge drying device; S3-4-5-6, obtain the wet hot air and hot air waste heat of the low moisture content sludge; S3-4-5-7, using the waste heat recovery equipment to obtain the third dry cold hot air according to the wet hot air of the low-moisture sludge and the waste heat of the hot air; S3-4-5-8, using the heater to obtain fourth dry cold and hot air as a second energy source for the sludge drying device according to the third dry cold and hot air and the first dry cold and hot air; S3-4-5-9, using the sludge drying device to perform low-vacuum drying treatment on the low-water content sludge according to the second energy source of the sludge drying device and the second initial parameter of the sludge drying device to obtain the dried sludge; Among them, the humid hot air of the low-moisture content sludge is the wind energy generated after the low-vacuum sludge drying device performs low-vacuum drying treatment on the tempered sludge, and the hot air waste heat is the low-vacuum waste heat recovery integrated drying sludge obtained by using the low-vacuum sludge drying device to perform low-vacuum drying treatment on the tempered sludge.

2. The low vacuum waste heat recovery integrated sludge drying method according to claim 1 is characterized in that: The process of obtaining conditioned sludge using the initial raw sludge to be treated includes: S1-1, using a flocculant to obtain initial conditioned sludge based on the initial raw sludge to be treated; S1-2, using the initial conditioned sludge to obtain the moisture content, specific resistance, particle size and viscosity of the initial conditioned sludge as initial conditioned sludge characteristics; S1-3, obtaining corresponding historical initial conditioned sludge characteristics according to the initial conditioned sludge characteristics; S1-4. Determine whether the characteristics of the initial conditioned sludge are consistent with the characteristics of the historical initial conditioned sludge. If so, obtain the initial conditioned sludge as the conditioned sludge. Otherwise, obtain the initial conditioned sludge that is inconsistent with the characteristics of the historical initial conditioned sludge, add it to the initial raw mud to be processed, and return to S1-1.

3. The low vacuum waste heat recovery integrated sludge drying method according to claim 2 is characterized in that: Based on the initial raw mud to be treated, obtaining the initial conditioned sludge by using a flocculant comprises: S1-1-1, using the initial raw mud to be processed to obtain the water content, specific resistance, particle size and viscosity of the initial raw mud to be dried; S1-1-2, according to the specific resistance of the initial raw mud to be dried, obtaining a specific resistance threshold of the corresponding historical initial raw mud to be dried as a first specific resistance threshold; S1-1-3, judging whether the specific resistance of the initial raw mud to be dried meets the first specific resistance threshold, if so, obtaining the moisture content, specific resistance, particle size and viscosity of the initial raw mud to be dried as the characteristics of the initial raw mud to be dried, and executing S1-1-4, otherwise, obtaining the initial raw mud to be dried as high-moisture content sludge, and directly executing S3; S1-1-4, obtaining a target dosage of flocculant according to the characteristics of the initial raw mud to be dried; S1-1-5. Obtaining initial conditioned sludge based on the target dose of flocculant and the initial raw sludge to be dried.

4. The low vacuum waste heat recovery integrated sludge drying method according to claim 3 is characterized in that: The sludge with high water content is obtained by filter pressing according to the conditioned sludge, which includes: S2-1, using the conditioned sludge to obtain the specific resistance, particle size and viscosity of the conditioned sludge as the conditioned sludge characteristics; S2-2, obtaining initial parameters of the sludge filter press device according to the characteristics of the conditioned sludge; S2-3. According to the initial parameters of the sludge filter press device, the sludge filter press device is used to perform filter press treatment on the tempered sludge to obtain the high-water content sludge.

5. The low vacuum waste heat recovery integrated sludge drying method according to claim 4 is characterized in that: The initial parameters of the sludge filter press device obtained according to the conditioned sludge characteristics include: S2-2-1, using the conditioned sludge characteristics and the corresponding historical conditioned sludge characteristics to obtain a first particle size threshold, a first viscosity threshold, and a second viscosity threshold of the historical conditioned sludge as historical conditioned sludge characteristic thresholds; S2-2-2. Obtaining initial parameters of the sludge filter press device according to the conditioned sludge characteristics and the historical conditioned sludge characteristic thresholds.

6. The low vacuum waste heat recovery integrated sludge drying method according to claim 5, characterized in that: Acquiring the initial parameters of the sludge filter press device according to the conditioned sludge characteristics and the historical conditioned sludge characteristics thresholds includes: S2-2-2-1, determining whether the specific resistance of the conditioned sludge is completely consistent with the first specific resistance threshold, if so, executing S2-2-2-2, otherwise, retaining the conditioned sludge consistent with the first specific resistance threshold, and using the conditioned sludge inconsistent with the first specific resistance threshold as the initial raw sludge to be processed, and returning to S1-1; S2-2-2-2, determine whether the particle size of the conditioned sludge is completely consistent with the first particle size threshold, if so, execute S2-2-2-3, otherwise, retain the conditioned sludge consistent with the first particle size threshold, and use the conditioned sludge inconsistent with the first particle size threshold as the initial raw sludge to be processed, and return to S1-1; S2-2-2-3, determining whether the viscosity of the conditioned sludge is completely consistent with the first viscosity threshold; if so, obtaining a first initial pressure and a first filter pressing time as initial parameters of the sludge filter pressing device according to the first specific resistance threshold, the first particle size threshold and the first viscosity threshold; otherwise, executing S2-2-2-4; S2-2-2-4. Determine whether the viscosity of the tempered sludge is completely consistent with the second viscosity threshold. If so, obtain the second initial pressure and the second filtration time as the initial parameters of the sludge filter press device according to the first specific resistance threshold, the first particle size threshold and the second viscosity threshold. Otherwise, obtain the third initial pressure and the third filtration time as the initial parameters of the sludge filter press device according to the characteristics of the tempered sludge.

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