CMFSD solid waste drying treatment system and method thereof

Abstract

The invention belongs to the technical field of deep drying and dehydration of mixed sludge, and particularly relates to a CMFSD solid waste drying treatment system and method, and the CMFSD solid waste drying treatment system comprises mechanical dehydration equipment, pre-crushing equipment, mixing and stirring equipment, a discharging pit, crushing equipment, transfer equipment and a temporary storage warehouse, discharging of the mechanical dehydration equipment and discharging of the pre-crushing equipment are combined and sequentially connected with mixing and stirring equipment and a discharging pit, cured materials enter the crushing equipment to be crushed and then enter a temporary storage warehouse through transferring equipment, the materials are conveyed to a cement kiln when the water content of the materials in the temporary storage warehouse is reduced to 30% or below, and temperature detection devices are arranged in the discharging pit and the temporary storage warehouse. According to the invention, heat generated by curing is utilized to carry out deep dehydration treatment on water-containing solid hazardous wastes such as sludge, oil clay, wax clay, waste adsorbents and the like generated by an industrial sewage treatment plant. Compared with the prior art, the method has the beneficial effects of short process flow, less equipment, extremely low failure rate, stable finished product quality, easiness in operation and extremely low material dehydration cost.

Description

Technical Field

[0001] The invention belongs to the technical field of mixed sludge deep drying and dehydration, and in particular relates to a CMFSD solid waste drying treatment system and a method thereof. Background Art

[0002] In the field of sludge deep drying, the widely used technologies are mainly mechanical sludge dehydration methods represented by centrifugal dehydrators, plate and frame filter presses, and belt presses, and thermal sludge drying methods represented by drum drying technology, blade drying technology, disc drying technology, fluidized bed sludge drying technology, and low-temperature thermal drying technology. The former can reduce the sludge moisture content to 60% at most under the premise of adding a large amount of reagents; the latter can reduce the sludge moisture content to 30% or even below 10% under the premise of consuming a large amount of energy. At the same time, the above equipment each has its own adaptive materials, and generally one equipment can only process a certain type of sludge at a time. When there are many types of sludge, various different equipment needs to be set up. Once a certain type of sludge is no longer produced, the corresponding equipment may be scrapped, causing waste.

[0003] Different equipment can achieve different drying effects when processing different materials. In the end, they still need to enter the mixer for mixing. After two or more dry materials are mixed, the humidity of the mixed materials cannot be uniform immediately. They still need to stand in the storage area for a certain period of time. The lower the moisture content, the longer the standing time, which affects production efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a CMFSD solid waste drying treatment system and method, which overcomes the shortcomings of the prior art, utilizes the diffusion principle of liquid molecules, and provides the diffusion power of liquid molecules through the heat generated by the fermentation process of organic matter remaining in biochemical sludge, so that water molecules and oil molecules are combined with the network structure of dry solid materials, and the excess water molecules are evaporated and removed during the stirring and standing process, thereby realizing a shorter process and more effective mixed solid waste drying process.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] One of the technical solutions: a CMFSD solid waste drying treatment system, characterized in that it includes mechanical dehydration equipment, pre-crushing equipment, mixing and stirring equipment, a discharge pit, crushing equipment, transfer equipment and a temporary storage warehouse. The discharges of the mechanical dehydration equipment and the pre-crushing equipment are combined and connected in sequence to the mixing and stirring equipment and the discharge pit. The matured materials are crushed in the crushing equipment and then enter the temporary storage warehouse through the transfer equipment. The moisture content of the materials in the temporary storage warehouse drops below 30% and is sent to the cement kiln. Temperature detection devices are provided in the discharge pit and the temporary storage warehouse.

[0007] The mechanical dehydration equipment is a plate and frame filter press or a vacuum dehydrator.

[0008] The pre-crushing equipment is any one of an excavator with hammer digging teeth, a manual hammer blunt instrument, and a wide-pitch pulverizer.

[0009] The mixing and stirring equipment is any one of a bridge grab crane, an excavator or a loader.

[0010] The crushing equipment is a soil screening bucket installed at the front end of the excavator's boom, which is a hydraulic crushing and screening device.

[0011] The unloading pit and temporary storage are relatively closed spaces, and the parts in contact with the materials are provided with anti-corrosion and anti-seepage layers. Pipes and drainage ditches for collecting water vapor are arranged on the surface of the anti-corrosion and anti-seepage layers.

[0012] At least one of the unloading pit and the temporary storage is converted from a semi-underground concrete structure closed factory building with good lighting.

[0013] Technical Solution 2: A CMFSD solid waste drying treatment method, characterized in that the heat generated by maturation is used to deeply dehydrate the water-containing solid hazardous wastes such as sludge, oil clay, wax clay, and waste adsorbent generated by industrial sewage treatment plants, and the specific steps are as follows:

[0014] 1) Pretreatment: Soft sludge with a moisture content of 60-80% is dehydrated to 60% by mechanical dehydration equipment, and hard materials with a low moisture content of less than 60% are pre-crushed to a particle size of less than 400mm;

[0015] 2) Mixing and stirring evenly according to the weight ratio of sludge: clay: adsorbent: lime = 12:5:2:1;

[0016] 3) Maturation: The mixture is matured in the unloading pit and stirred every 7 days. In the third cycle, the temperature of the pile is monitored. When the temperature rises to about 60°C, the reaction is considered to be normal. Otherwise, the static period should be appropriately extended.

[0017] 4) Pile the material. The matured material is crushed to 8-12 mm by crushing equipment, and then transported to a temporary storage warehouse by transporting equipment. The material is turned over every 5 days. The temperature of the pile is monitored in the second cycle. When the temperature rises to about 60°C, the reaction is considered to be normal. Otherwise, the static period should be appropriately extended.

[0018] 5) Dehydration is completed. When the moisture content of the mixed material drops below 30%, the material meets the requirements of subsequent cement kiln coordinated processing and is sent to the cement kiln.

[0019] In the step 2), for the oily clay and waxy clay with high oil content, it is necessary to sample the mixture at intervals of 1 m, and the calorific value deviation should be less than 5% to ensure uniform oil distribution.

[0020] The maturation requires at least 5 cycles; the stockpiling requires at least 4 cycles.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The process of the present invention is short, the equipment is small, the failure rate is extremely low, the quality of the finished product is stable, and it is easy to operate;

[0023] 2) The present invention integrates storage and processing, with a small footprint, long storage time, and strong adaptability to fluctuations in the flow of upstream and downstream materials; for example, for a 40,000 ton / year processing project, the project covers an area of ​​only 6,000 m 2 ;

[0024] 3) The present invention is operated in a relatively closed space and has little impact on the environment;

[0025] 4) The present invention saves energy. Except for a small amount of electricity and fuel consumed in mixing, deep dehydration does not require an additional heat source, and the dehydration cost per ton of material is extremely low. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic block diagram of the structure of an embodiment of the present invention;

[0027] Figure 2-3 It is a schematic diagram of the process flow of an embodiment of the present invention. The two figures are spliced ​​together to form the entire process flow diagram. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0030] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the invention claimed, but merely represents selected embodiments of the present invention.

[0031] See Figure 1, is a schematic structural diagram of an embodiment of a CMFSD solid waste drying treatment system of the present invention, comprising a mechanical dehydration device, a pre-crushing device, a mixing and stirring device, a discharge pit, a crushing device, a transfer device and a temporary storage warehouse. The discharges of the mechanical dehydration device and the pre-crushing device are combined and connected in sequence to the mixing and stirring device and the discharge pit. The matured material enters the crushing device for crushing and then enters the temporary storage warehouse through the transfer equipment. The moisture content of the material in the temporary storage warehouse drops below 30% and is sent to the cement kiln. A temperature detection device is provided in the discharge pit and the temporary storage warehouse.

[0032] The mechanical dehydration equipment is a plate and frame filter press or a vacuum dehydrator, preferably a plate and frame filter press.

[0033] The pre-crushing equipment is any one of an excavator with hammer teeth, a manual hammer blunt instrument, and a wide-pitch powder machine. For materials with high oil content and materials with increased viscosity after heating, avoid using crushing equipment based on the extrusion principle.

[0034] The mixing and stirring equipment is any one of a bridge grab crane, an excavator or a loader, which performs rough mixing and stirring.

[0035] The crushing equipment is a soil screening bucket installed at the front end of the excavator's boom. It is a hydraulic crushing and screening device used in the field of soil crushing. The powder screening bucket has three functions of excavation, crushing and screening in one.

[0036] The unloading pit and temporary storage are relatively closed spaces, and the parts in contact with the materials are provided with anti-corrosion and anti-seepage layers. Pipes and drainage ditches for collecting water vapor are arranged on the surface of the anti-corrosion and anti-seepage layers.

[0037] At least one of the unloading pit and the temporary storage is converted from a semi-underground concrete structure enclosed factory building with good lighting.

[0038] See Figure 2-3 The present invention provides a CMFSD solid waste drying treatment method, which utilizes the heat generated by aging to perform deep dehydration treatment on water-containing solid hazardous wastes such as sludge, oil clay, wax clay, and waste adsorbent generated by industrial sewage treatment plants. The specific steps are as follows:

[0039] 1) Pretreatment: Soft sludge with high moisture content (about 80%) is dehydrated to 60% by mechanical dehydration equipment (plate and frame filter press), and hard materials with low moisture content (<60%) are pre-crushed to a particle size of less than 400 mm;

[0040] 2) Mixing: Use a bridge grab crane to mix and stir evenly according to the weight ratio of sludge: clay: adsorbent: lime = 12:5:2:1; for oily clay and waxy clay with high oil content, it is necessary to sample the mixed material at intervals of 1m, and the calorific value deviation should be less than 5% to ensure uniform oil distribution.

[0041] 3) Maturation: The mixture is matured in the unloading pit and stirred every 7 days. In the third cycle, the temperature of the pile is monitored. When the temperature rises to about 60°C, the reaction is considered to be normal. Otherwise, the static period should be appropriately extended. Maturation requires at least 5 cycles;

[0042] 4) Stacking: The matured materials are crushed into 8-12 mm by crushing equipment, and transported to a temporary storage warehouse via transfer equipment (belt conveyor). The materials are turned over every 5 days. The temperature of the pile is monitored during the second cycle. When the temperature rises to about 60°C, the reaction is considered to be proceeding normally. Otherwise, the static period should be appropriately extended. Stacking requires at least 4 cycles.

[0043] 5) Dehydration is completed. When the moisture content of the mixed material drops below 30%, the material meets the requirements of subsequent cement kiln coordinated processing and is sent to the cement kiln.

[0044] In the present invention, CMFSD is the abbreviation of Crush-Mix-Ferment-Solid waste Dry.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CMFSD solid waste drying treatment system, characterized in that: It includes mechanical dehydration equipment, pre-crushing equipment, mixing and stirring equipment, a discharge pit, crushing equipment, transfer equipment and a temporary storage warehouse. The outputs of the mechanical dehydration equipment and the pre-crushing equipment are combined and connected to the mixing and stirring equipment and the discharge pit in sequence. The matured materials are crushed in the crushing equipment and then enter the temporary storage warehouse through the transfer equipment. The moisture content of the materials in the temporary storage warehouse drops below 30% and is sent to the cement kiln. The discharge pit and the temporary storage warehouse are provided with temperature detection devices.

2. A CMFSD solid waste drying treatment system according to claim 1, characterized in that: The mechanical dehydration equipment is a plate and frame filter press or a vacuum dehydrator.

3. A CMFSD solid waste drying treatment system according to claim 1, characterized in that: The pre-crushing equipment is any one of an excavator with hammer digging teeth, a manual hammer blunt instrument, and a wide-pitch pulverizer.

4. A CMFSD solid waste drying treatment system according to claim 1, characterized in that: The mixing and stirring equipment is any one of a bridge grab crane, an excavator or a loader.

5. A CMFSD solid waste drying treatment system according to claim 1, characterized in that: The crushing equipment is a soil screening bucket installed at the front end of the excavator's boom, which is a hydraulic crushing and screening device.

6. A CMFSD solid waste drying treatment system according to claim 1, characterized in that: The unloading pit and temporary storage are relatively closed spaces, and the parts in contact with the materials are provided with anti-corrosion and anti-seepage layers. Pipes and drainage ditches for collecting water vapor are arranged on the surface of the anti-corrosion and anti-seepage layers.

7. A CMFSD solid waste drying treatment system according to claim 6, characterized in that: At least one of the unloading pit and the temporary storage is converted from a semi-underground concrete structure closed factory building with good lighting.

8. A CMFSD solid waste drying treatment method, characterized in that: The heat generated by maturation is used to deeply dehydrate the water-containing solid hazardous wastes such as sludge, oil clay, wax clay, and waste adsorbent generated by industrial sewage treatment plants. The specific steps are as follows: 1) Pretreatment: Soft sludge with a moisture content of 60-80% is dehydrated to 60% by mechanical dehydration equipment, and hard materials with a moisture content of less than 60% are pre-crushed to a particle size of less than 400mm; 2) Mixing and stirring evenly according to the weight ratio of sludge: clay: adsorbent: lime = 12:5:2:1; 3) Maturation: The mixture is subjected to material aging reaction in the unloading pit, and the mixture is stirred once every 7 days. In the third cycle, the temperature of the pile is monitored. When the temperature rises to about 60°C, the reaction is considered to be proceeding normally, otherwise the static period should be appropriately extended; 4) Pile the material. The matured material is crushed to 8-12 mm by crushing equipment, and then transported to a temporary storage warehouse by transporting equipment. The material is turned over every 5 days. The temperature of the pile is monitored in the second cycle. When the temperature rises to about 60°C, the reaction is considered to be normal. Otherwise, the static period should be appropriately extended. 5) Dehydration is completed. When the moisture content of the mixed material drops below 30%, the material meets the requirements of subsequent cement kiln coordinated processing and is sent to the cement kiln.

9. A CMFSD solid waste drying treatment method according to claim 8, characterized in that: In the step 2), for the oily clay and waxy clay with high oil content, it is necessary to sample the mixture at intervals of 1 m, and the calorific value deviation should be less than 5% to ensure uniform oil distribution.

10. A CMFSD solid waste drying treatment method according to claim 8, characterized in that: The maturation requires at least 5 cycles; the stockpiling requires at least 4 cycles.

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