CN106746468B - Sludge treatment system and treatment process - Google Patents
Sludge treatment system and treatment process Download PDFInfo
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- CN106746468B CN106746468B CN201710061232.1A CN201710061232A CN106746468B CN 106746468 B CN106746468 B CN 106746468B CN 201710061232 A CN201710061232 A CN 201710061232A CN 106746468 B CN106746468 B CN 106746468B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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Abstract
The invention relates to a sludge treatment system and a treatment process, and belongs to the technical field of water treatment. The process comprises the steps of firstly, stabilizing the sludge quality of sludge by a sludge concentration tank; then the sludge enters a sludge conditioning tank to carry out sludge wall breaking through adding a conditioning agent; then, the mixture enters a high-pressure mechanical plate-and-frame filter press to be subjected to filter pressing until the water content is 55-60%; then the sludge enters a sludge drying furnace, and after indirect heat exchange is carried out on low-temperature flue gas generated by a sludge carbonization furnace, the dewatered sludge is dried until the water content is below 10 percent; then the sludge enters a sludge carbonization furnace, and dried sludge is pyrolyzed by high-temperature flue gas generated by a burning hot blast stove to generate biochar and tail gas; tail gas generated by the sludge drying furnace and the sludge carbonization furnace enters a tail gas purification tower for purification and separation, and generated combustible gas and waste oil are incinerated in an incineration hot blast furnace; the biochar is comprehensively utilized. The invention can economically and efficiently treat the sludge of the sewage treatment plant, thereby realizing the comprehensive utilization of the sludge of the sewage treatment plant.
Description
Technical Field
The invention belongs to the technical field of water treatment, particularly relates to a sludge treatment system and a treatment process, and particularly relates to a treatment system and a treatment process for sludge generated in a water treatment process of a sewage treatment plant.
Background
With the development of sewage treatment work in China, the problem of water pollution is effectively relieved, but the sludge yield of sewage plants is increased more and more. The amount of the sludge accounts for 0.3-0.5 percent (volume) of the amount of the sewage or 1-2 percent of the amount of the sewage to be treated, and if the advanced treatment is carried out, the amount of the sludge can be increased by 0.5-1 time. Due to the factors of high difficulty of sludge treatment technology, large investment, uncertain return and the like, domestic enterprises related to the field are few, the scale is small, and the gap is larger compared with the advanced foreign countries. In the existing sewage treatment facilities in China, the sludge stabilization treatment facilities are less than 25 percent, and the treatment process and the supporting equipment are less than 10 percent perfect. The sludge period is characterized in that: (1) the heavy metal content is high, and 50% of heavy metal is transferred to sludge in the sewage treatment process; (2) the content of organic matter and N, P is high, the content of organic matter is between 25 and 50 percent, the content of N is between 2 and 5 percent, and the content of P is between 0.5 and 2 percent; (3) the heat value is high and can reach 9 MJ/KG-20 MJ/KG (sludge dry basis heat value). At present, the research on new sludge treatment and recycling technologies has become a hot research topic of great concern for environmental protection workers at home and abroad.
At present, the domestic existing sludge treatment technologies comprise 4 types as follows:
(1) sanitary landfill
Sanitary landfill of sludge is currently developed as a mature sludge disposal technology. Its advantages are less investment, high capacity and quickly taking its effect. The basic mode is that the municipal sludge is directly dumped into landfill sites, low lands or valley lands to manufacture artificial plains after simple dehydration and sterilization treatment. The method has low technical requirements on the previous sludge treatment, and generally comprises the steps of digesting, reducing or naturally drying. Therefore, a large area of field and a large amount of transportation cost are needed, and the foundation needs to be subjected to anti-seepage treatment to avoid polluting underground water, so that the proportion of sludge landfill treatment is smaller and smaller in recent years, and the landfill can not finally avoid environmental pollution but only delays the generation time.
(2) Incineration of
The burning can achieve the purpose of reducing the amount to the maximum extent. The burning can destroy all organic matters and kill all pathogens. If the urban sanitation requirement is high or the toxic substance content of the sludge is high, the sludge cannot be reused, but if the combustion heat value of the sludge is large, the sludge can be treated by adopting an incineration method. However, the ash content after sludge incineration does not have a reasonable treatment method at present. The smoke generated in the burning process can cause secondary pollution. In addition, the incineration treatment of sludge consumes a large amount of energy, and is uneconomical and expensive.
(3) Anaerobic digestion
Anaerobic digestion utilizes the decomposition effect of anaerobic microorganisms to decompose and stabilize organic matters in sludge. Anaerobic digestion is generally carried out in a closed digestion tank, and the digestion tank is stored for about 30 days at 30 ℃, mainly decomposes organic matters through the actions of facultative anaerobic bacteria and anaerobic bacteria, and finally generates methane which is mainly methane. The anaerobic digestion treatment can achieve the purpose of sludge reduction, can recover part of energy and also reduce the burden of subsequent treatment. However, the water content of the digested sludge is high, and further dehydration is still needed.
(4) Compost
Composting is the process of fermentation using microorganisms in the sludge. A certain proportion of leavening agent and conditioning agent (such as straw, rice straw, wood dust or domestic garbage) are added into the sludge, and a microbial community is utilized to carry out oxidative decomposition on a plurality of organic matters in a humid environment and convert the organic matters into humoid. The composted sludge has loose texture, significantly increased Cation Exchange Capacity (CEC), reduced volume weight, increased nutrient content available to plants, and almost completely killed pathogenic bacteria and parasitic ova. However, heavy metals such as arsenic, copper, chromium, mercury and the like and toxic and harmful substances in the sludge after composting cannot be removed, and the transfer of pollutants is easy to cause.
The operating conditions of several typical domestic and foreign sludge treatment process projects are listed in table 1.
TABLE 1
In order to more reasonably and comprehensively utilize organic matters and heat values thereof in the sludge, and particularly solve the problems of high heavy metal content, high investment cost, complex management and high operation cost in the sludge treatment process. A new technology which can meet the requirements of more advanced, more economical and more efficient landfill leachate treatment must be adopted. Therefore, how to overcome the defects of the prior art is a problem which needs to be solved urgently in the technical field of water treatment at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sludge treatment system and a treatment process.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a sludge treatment system comprises a sludge concentration tank, a sludge conditioning tank, a high-pressure mechanical plate-and-frame filter press, a sludge drying furnace, a sludge carbonization furnace, a biochar cooling device, a conditioner dosing system, an incineration hot blast furnace, a tail gas purification tower, a tail gas fan, a gas storage tank and an oil-water separator;
the sludge outlet of the sludge concentration tank is connected with the sludge inlet of the sludge conditioning tank through a pipeline; the dosing outlet of the conditioner dosing system is connected with the dosing port of the sludge conditioning tank through a pipeline; the sludge outlet of the sludge conditioning pool is connected with the inlet of the high-pressure mechanical plate-and-frame filter press through a pipeline; the sludge outlet of the high-pressure mechanical plate-and-frame filter press is connected with the sludge inlet of the sludge drying furnace through a pipeline; the sludge outlet of the sludge drying furnace is connected with the sludge inlet of the sludge carbonization furnace through a pipeline; a biochar outlet of the sludge carbonization furnace is connected with biochar cooling equipment through a pipeline;
the flue gas outlet of the incineration hot blast stove is connected with the air inlet of the sludge carbonization furnace through a pipeline;
the air outlet of the sludge carbonization furnace is connected with the air inlet of the sludge drying furnace through a pipeline;
the gas outlet of the sludge drying furnace is connected with the gas inlet of the tail gas purification tower through a pipeline;
the combustible gas outlet of the tail gas purification tower is connected with the air inlet of the tail gas fan through a pipeline; the air outlet of the tail gas fan is connected with the air inlet of the air storage tank through a pipeline; the air outlet of the air storage tank is connected with the air inlet of the burning hot blast stove through a pipeline;
an oily wastewater outlet of the tail gas purification tower is connected with a water inlet of the oil-water separator through a pipeline; the waste oil outlet of the oil-water separator is connected with the oil inlet of the burning hot blast stove through a pipeline.
The invention also provides a sludge treatment process, and the sludge treatment system comprises the following steps:
step (1), sludge produced in the water treatment process of a sewage treatment plant enters a sludge concentration tank to stabilize the sludge quality and enable the water content to reach 98% -99%, then the sludge enters a sludge conditioning tank, and a conditioning agent is added through a conditioning agent adding system until sludge flocs and sludge cell membranes are subjected to wall breaking effect;
step (2), the sludge conditioned in the step (1) enters a high-pressure mechanical plate-and-frame filter press to be subjected to filter pressing until the water content is reduced to 55% -60%, and dewatered sludge is obtained;
step (3), the dehydrated sludge obtained in the step (2) is sent into a sludge drying furnace, and low-temperature flue gas which is conveyed by a sludge carbonization furnace and has the temperature of 359-400 ℃ is used for drying until the water content of the sludge is below 10%;
step (4), the sludge dried in the step (3) enters a sludge carbonization furnace, high-temperature flue gas at 700-800 ℃ conveyed by a burning hot blast stove is pyrolyzed, and the sludge dried in the step (3) is pyrolyzed into tail gas and biochar;
step (5), cooling the biochar obtained in the step (4) in biochar cooling equipment to 40-50 ℃; bagging and transporting the cooled biochar out for comprehensive utilization;
step (6), tail gas generated in the sludge drying furnace enters a tail gas purification tower, and is purified by a wet deacidification method to obtain combustible gas and oily wastewater;
step (7), the combustible gas obtained in the step (6) enters a gas storage tank through a tail gas fan, and then is supplied to a burning hot blast stove for burning; and (4) carrying out oil-water separation on the oily wastewater obtained in the step (6) through an oil-water separator, sending the separated waste oil into a burning hot blast stove for burning treatment, and discharging the wastewater into a sewage plant for treatment.
Further, it is preferable that the biochar cooling device cools the biochar by using circulating cooling water.
Further, preferably, the conditioner is one or a mixture of several of polyacrylamide, polyferric chloride and fly ash. When a mixture, the proportions between the components are not required. The conditioner used in the present invention is not limited thereto, and a sewage conditioner conventionally used in the art may be used.
A sludge drying furnace: the furnace body is used for carrying out indirect heat exchange between low-temperature flue gas generated by burning of the burning hot-blast stove and sludge and drying the sludge dehydrated by the high-pressure mechanical plate-and-frame filter press.
A sludge carbonization furnace: the furnace body is used for carrying out indirect heat exchange between high-temperature flue gas generated by burning of the burning hot-blast stove and sludge and carrying out pyrolysis on the dried sludge.
Burning the hot blast stove: the incinerator body incinerates natural gas, combustible gas generated in the drying process of the sludge drying furnace, combustible gas generated in the pyrolysis process of the sludge carbonization furnace and separated waste oil.
Tail gas purification tower: a tower body for purifying and separating the smoke generated by the sludge drying furnace and the sludge carbonization furnace.
The invention reuses the waste oil, has good economic benefit, but the utilization mode is not limited to the method.
The invention is characterized in that combustible gas discharged from a gas storage tank is introduced into a burning hot-blast stove for burning treatment, the generated high-temperature flue gas is firstly introduced into a gap between a roller and an external heat insulation chamber of a sludge carbonization furnace, and dry sludge is heated and carbonized into biochar through the roller; then, low-temperature flue gas discharged from the sludge carbonization furnace is introduced into a gap between a roller and an external heat preservation chamber of the sludge drying furnace, and the dewatered sludge is heated and dried into dry sludge through the roller; finally, the generated standard gas is discharged into the atmosphere.
Compared with the traditional treatment method adopting landfill after mechanical dehydration and anaerobic or composting process, the invention has the following remarkable advantages and effects:
1. by adopting a biological sludge wall breaking method and a high-pressure mechanical plate-and-frame filter pressing mode, the water content of the dewatered sludge is lower than 60 percent, no other chemical agent is increased, and the reduction of the water content of the sludge and the controllability of pollutants are ensured.
2. Deep dehydration is carried out on the sludge by adopting sludge drying furnace equipment (the temperature is between 350 and 400 ℃), so that the water content of the sludge is reduced to be below 10 percent, and the energy consumption of the sludge carbonization stage is reduced.
3. And (3) carbonizing the sludge by adopting sludge carbonization furnace equipment (the temperature is between 700 and 800 ℃), so that the water content of the sludge is reduced to be below 5 percent, and the reduction and the recycling of the sludge are realized.
4. The tail gas purification tower and the oil-water separator are adopted to treat and collect the flue gas generated by the sludge drying furnace and the sludge carbonization furnace, so that the environmental protection of the flue gas is ensured to reach the standard and the recovery of available resources is ensured.
5. Combustible gas generated in the sludge carbonization section is recovered and combusted by adopting the gas storage tank and the hot blast stove, so that the energy consumption in the sludge drying and carbonization stages is reduced.
6. The process method can realize resource utilization of the sludge, protect the ecological environment and solve the key problem for the treatment of the sludge in the sewage plant.
The carbonization process of the system of the present invention was compared to the existing sludge treatment process and analyzed as shown in table 1.
TABLE 1
Drawings
FIG. 1 is a schematic view showing the structure of a sludge treatment system according to the present invention.
Wherein, 1, a sludge concentration tank; 2. a sludge conditioning tank; 3. a high-pressure mechanical plate-and-frame filter press; 4. a sludge drying furnace; 5. a sludge carbonization furnace; 6. a biochar cooling device; 7. a conditioner dosing system; 8. burning the hot blast stove; 9. a tail gas purification tower; 10. a tail gas fan; 11. an air tank; 12. an oil-water separator; (ii) a
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The devices or materials used are not indicated by the manufacturer, and are all conventional products available by purchase.
As shown in fig. 1, a sludge treatment system comprises a sludge concentration tank 1, a sludge conditioning tank 2, a high-pressure mechanical plate-and-frame filter press 3, a sludge drying furnace 4, a sludge carbonization furnace 5, a biochar cooling device 6, a conditioner dosing system 7, an incineration hot-blast furnace 8, a tail gas purification tower 9, a tail gas fan 10, a gas storage tank 11 and an oil-water separator 12;
the sludge outlet of the sludge concentration tank 1 is connected with the sludge inlet of the sludge conditioning tank 2 through a pipeline; a dosing outlet of the conditioner dosing system 7 is connected with a dosing port of the sludge conditioning tank 2 through a pipeline; the sludge outlet of the sludge conditioning pool 2 is connected with the inlet of the high-pressure mechanical plate-and-frame filter press 3 through a pipeline; the sludge outlet of the high-pressure mechanical plate-and-frame filter press 3 is connected with the sludge inlet of the sludge drying furnace 4 through a pipeline; the sludge outlet of the sludge drying furnace 4 is connected with the sludge inlet of the sludge carbonization furnace 5 through a pipeline; a biochar outlet of the sludge carbonization furnace 5 is connected with biochar cooling equipment 6 through a pipeline;
the flue gas outlet of the incineration hot blast stove 8 is connected with the air inlet of the sludge carbonization furnace 5 through a pipeline;
the air outlet of the sludge carbonization furnace 5 is connected with the air inlet of the sludge drying furnace 4 through a pipeline;
the gas outlet of the sludge drying furnace 4 is connected with the gas inlet of the tail gas purification tower 9 through a pipeline;
the combustible gas outlet of the tail gas purification tower 9 is connected with the air inlet of the tail gas fan 10 through a pipeline; an air outlet of the tail gas fan 10 is connected with an air inlet of the air storage tank 11 through a pipeline; the air outlet of the air storage tank 11 is connected with the air inlet of the incineration hot blast stove 8 through a pipeline;
an oily wastewater outlet of the tail gas purification tower 9 is connected with a water inlet of the oil-water separator 12 through a pipeline; the waste oil outlet of the oil-water separator 12 is connected with the oil inlet of the burning hot blast stove 8 through a pipeline.
The sludge treatment system comprises the following steps:
step (1), sludge produced in the water treatment process of a sewage treatment plant enters a sludge concentration tank 1 to stabilize the sludge quality and enable the water content to reach 98% -99%, then the sludge enters a sludge conditioning tank 2, and a conditioner is added through a conditioner dosing system 7 until sludge floc and sludge cell membranes are subjected to wall breaking effect;
step (2), the sludge conditioned in the step (1) enters a high-pressure mechanical plate-and-frame filter press 3 to be subjected to filter pressing until the water content is reduced to 55% -60%, and dewatered sludge is obtained;
step (3), the dehydrated sludge obtained in the step (2) is sent into a sludge drying furnace 4, and low-temperature flue gas with the temperature of 359-400 ℃ conveyed by a sludge carbonization furnace 5 is used for drying until the water content of the sludge is below 10%;
step (4), the sludge dried in the step (3) enters a sludge carbonization furnace 5, high-temperature flue gas with the temperature of 700-800 ℃ conveyed by an incineration hot blast stove 8 is subjected to pyrolysis, and the sludge dried in the step (3) is pyrolyzed into tail gas and biochar;
step (5), cooling the biochar obtained in the step (4) in biochar cooling equipment 6 to 40-50 ℃; bagging and transporting the cooled biochar out for comprehensive utilization;
step (6), tail gas generated in the sludge drying furnace 4 enters a tail gas purification tower 9, and is purified by a wet deacidification method to obtain combustible gas and oily wastewater;
step (7), the combustible gas obtained in the step (6) enters a gas storage tank 11 through a tail gas fan 10, and then is supplied to a burning hot blast stove 8 for burning; and (4) carrying out oil-water separation on the oily wastewater obtained in the step (6) through an oil-water separator 12, sending the separated waste oil into a burning hot blast stove 8 for burning treatment, and discharging the wastewater into a sewage plant for treatment.
In a preferred embodiment, the biochar cooling equipment adopts cooling circulating water to cool the biochar. The conditioner is one or a mixture of more of polyacrylamide, polyferric chloride and fly ash. When a mixture, the proportions between the components are not required. The conditioner used in the present invention is not limited thereto, and a sewage conditioner conventionally used in the art may be used.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. The sludge treatment process is characterized by adopting the following sludge treatment system:
comprises a sludge concentration tank (1), a sludge conditioning tank (2), a high-pressure mechanical plate-and-frame filter press (3), a sludge drying furnace (4), a sludge carbonization furnace (5), a biochar cooling device (6), a conditioner dosing system (7), an incineration hot blast stove (8), a tail gas purification tower (9), a tail gas fan (10), a gas storage tank (11) and an oil-water separator (12);
the sludge outlet of the sludge concentration tank (1) is connected with the sludge inlet of the sludge conditioning tank (2) through a pipeline; a dosing outlet of the conditioner dosing system (7) is connected with a dosing port of the sludge conditioning tank (2) through a pipeline; the sludge outlet of the sludge conditioning pool (2) is connected with the inlet of the high-pressure mechanical plate-and-frame filter press (3) through a pipeline; the sludge outlet of the high-pressure mechanical plate-and-frame filter press (3) is connected with the sludge inlet of the sludge drying furnace (4) through a pipeline; the sludge outlet of the sludge drying furnace (4) is connected with the sludge inlet of the sludge carbonization furnace (5) through a pipeline; a biochar outlet of the sludge carbonization furnace (5) is connected with biochar cooling equipment (6) through a pipeline;
the smoke outlet of the incineration hot blast stove (8) is connected with the air inlet of the sludge carbonization furnace (5) through a pipeline;
the air outlet of the sludge carbonization furnace (5) is connected with the air inlet of the sludge drying furnace (4) through a pipeline;
the gas outlet of the sludge drying furnace (4) is connected with the gas inlet of the tail gas purification tower (9) through a pipeline;
a combustible gas outlet of the tail gas purification tower (9) is connected with an air inlet of a tail gas fan (10) through a pipeline; an air outlet of the tail gas fan (10) is connected with an air inlet of the air storage tank (11) through a pipeline; the air outlet of the air storage tank (11) is connected with the air inlet of the incineration hot blast stove (8) through a pipeline;
an oily wastewater outlet of the tail gas purification tower (9) is connected with a water inlet of the oil-water separator (12) through a pipeline; a waste oil outlet of the oil-water separator (12) is connected with an oil inlet of the incineration hot blast stove (8) through a pipeline;
the method comprises the following steps:
step (1), sludge produced in a water treatment process of a sewage treatment plant enters a sludge concentration tank (1) to stabilize the amount of argillaceous sludge and enable the water content of the argillaceous sludge to reach 98% -99%, then the sludge enters a sludge conditioning tank (2), and a conditioning agent is added through a conditioning agent adding system (7) until sludge floc and sludge cell membranes generate a wall breaking effect;
step (2), the sludge conditioned in the step (1) enters a high-pressure mechanical plate-and-frame filter press (3) to be subjected to filter pressing until the water content is reduced to 55-60%, so that dewatered sludge is obtained;
step (3), the dehydrated sludge obtained in the step (2) is sent into a sludge drying furnace (4), and low-temperature flue gas which is conveyed by a sludge carbonization furnace (5) and has the temperature of 359-400 ℃ is used for drying until the water content of the sludge is below 10%;
step (4), the sludge dried in the step (3) enters a sludge carbonization furnace (5), high-temperature flue gas at 700-800 ℃ conveyed by a burning hot-blast stove (8) is pyrolyzed, and the sludge dried in the step (3) is pyrolyzed into tail gas and biochar;
step (5), cooling the biochar obtained in the step (4) in biochar cooling equipment (6) to 40-50 ℃; bagging and transporting the cooled biochar out for comprehensive utilization;
step (6), tail gas generated in the sludge drying furnace (4) enters a tail gas purification tower (9), and is purified by adopting a wet deacidification method to obtain combustible gas and oily wastewater;
step (7), the combustible gas obtained in the step (6) enters a gas storage tank (11) through a tail gas fan (10), and then is supplied to a burning hot blast stove (8) for burning; carrying out oil-water separation on the oily wastewater obtained in the step (6) through an oil-water separator (12), sending the separated waste oil into a burning hot blast stove (8) for burning treatment, and discharging the wastewater into a sewage plant for treatment;
the biochar cooling equipment (6) adopts cooling circulating water to carry out heat exchange with the biochar for cooling;
the conditioner is one or a mixture of more of polyacrylamide and fly ash.
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| CN111678152B (en) * | 2020-06-29 | 2020-12-08 | 山东龙之源节能环保科技有限公司 | Indirect sludge drying and incinerating system and drying and incinerating method thereof |
| CN113998866A (en) * | 2021-10-29 | 2022-02-01 | 广东尚鼎环境科技有限公司 | Organic solid waste treatment system and treatment process thereof |
| CN114133126A (en) * | 2021-12-17 | 2022-03-04 | 天津壹新环保工程有限公司 | Sludge carbonization treatment system and method |
| CN115490411B (en) * | 2022-11-21 | 2023-03-17 | 广东昕旺环保科技发展有限公司 | Sludge treatment agent and sludge treatment process |
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