CN102964047A - Treatment method of sludge drying - Google Patents
Treatment method of sludge drying Download PDFInfo
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- CN102964047A CN102964047A CN2012102534288A CN201210253428A CN102964047A CN 102964047 A CN102964047 A CN 102964047A CN 2012102534288 A CN2012102534288 A CN 2012102534288A CN 201210253428 A CN201210253428 A CN 201210253428A CN 102964047 A CN102964047 A CN 102964047A
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Abstract
The invention relates to a treatment method of sludge drying. The method consists of: metering wet sludge from a sewage treatment plant and sending it into a wet sludge stock bin for storage; sending the sludge in the wet sludge stock bin into a dryer to conduct continuous drying, thus decreasing the water content of dried sludge from 80% to 25-35%; bringing dried particles and gas into a cyclone separator, separating the solids from the gas by density difference, collecting the sludge particles at the bottom and discharging them by a rotary valve, sending the sludge particles into a cement kiln to perform burning; and sending the gas containing water vapor and a small amount of superfine solid particles into a bag type dust collector, reheating the filtered gas and vapor by a heater and returning them to the starting end of the dryer, leaving the rest vapor to enter a condensing tower to cool, and sending cooled wastewater to a sewage treatment unit. The invention has the advantages that: the heat source comes from the cement kiln, the heat drying equipment has high heat conversion efficiency, the dried sludge is directly transported into the cement kiln to burn, and the heat released from dried sludge combustion can replace part of fuel coal, thus realizing energy recovery and no secondary pollution.
Description
Technical field
The present invention relates to a kind for the treatment of process of sludge drying, it utilizes the high-temperature gas of cement kiln generation as the thermal source of sludge drying, and the mud after the mummification burns in decomposing furnace can Substitute For Partial fuel.
Background technology
Mud after city domestic sewage is processed, general water ratio is about 80%, is rich in the nutritive ingredients such as organic, contains again the objectionable impuritiess such as a certain amount of heavy metal and virus, pathogenic agent, parasitic ovum, and the improper meeting of sludge disposal causes serious secondary environmental pollution.At present the external main method of disposal of mud is landfill, burns, fills out sea and field application, European and American countries mainly is landfill and farmland utilization, the mud of Japan's marine reclamation land accounts for more than 70%, the main whereabouts of the sewage plant sludge of China is refuse landfill at present, along with improving constantly of wastewater treatment rate, the a large amount of output of mud is brought great burden to refuse landfill, shortened working life, and then caused again impact for treatment of urban garbage, and so that the place of suitable landfill seems more and more limited.Therefore seeking to solve outlet for the mud of municipal wastewater treatment plant, is vital.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind for the treatment of process of sludge drying, it utilizes the high-temperature gas of cement kiln generation as the thermal source of wet sludge anhydration, pass through again the thermal oil of moisture eliminator with the wet mud of heat transferred, make wet sludge anhydration, the mud after the mummification burns the heat that discharges in kiln tail decomposing furnace can the Substitute For Partial fire coal.
The objective of the invention is to realize that by following technical scheme it may further comprise the steps:
(1) from the wet mud of each sewage work after metering, at first enter mud and receive the storehouse, the drag conveyer that then receives the bottom, storehouse with mud is sent into wet sludge storage bin and is stored;
(2) mud in the wet sludge storage bin is admitted to moisture eliminator and carries out continuous mummification, the drying medium of described moisture eliminator is thermal oil, dry heat is all from cement kiln, by extract 850～900 degree high-temperature gases at the cement kiln decomposing furnace, the heat of high-temperature gas through heat exchanger the heat transferred thermal oil, thermal oil is recycled and is heated to 280～300 degree, the wet mud of heat transferred the most at last, make drying sludge (mud is heated drying in moisture eliminator), moisture is reduced to 25%～35% from 80%; Sludge volume after the mummification only is original 1/3～1/2.
(3) dried particle and gas enter cyclonic separator, and solid substance and gas are separated because of the density difference in cyclonic separator, and mud granule is collected in the bottom, is discharged by rotary valve;
(4) cooled mud granule is sent in the cement kiln decomposing furnace through handling equipment and is burned; Described dried sludge calorific value is about 2600 kilocalories, and burning in decomposing furnace can Substitute For Partial fuel.
(5) gas that contains water vapour and a small amount of ultrafine particle is sent to bag filter, and filtering gas and steam in bag filter are separated the superfine product of small particle size, and the fine particle product of separating sinks in the bottom, is sent to handling equipment; Mud granule in step (4) is sent in the cement kiln decomposing furnace and is burned;
(6) after the isolated vapor portion of bag filter extracted circulation through whizzer, a part was heated the top that returns to moisture eliminator again through well heater, and all the other steam enter the condensing tower cooling;
(7) cooled water of condensation (being waste water) is collected in the outflow of condensing tower bottom, then delivers to sewage treatment unit; The waste gas of discharging from the condensing tower top is sent to cement kiln by the centrifugal blower extraction and burns.Water after sewage treatment unit is processed can come back in the technique and utilize, and accomplishes the zero release of sewage.
Described mud receives the storehouse and is divided into 2, can hold altogether 80 tons of wet mud.
Described wet sludge storage bin divides a storehouse and b storehouse, can hold altogether 300 tons of wet mud.
Described moisture eliminator adopts turbine thin layer drying machine.
In the described step (2), being admitted to the maximum that moisture eliminator carries out the wet mud of continuous mummification is 4 tons/hour.
The heat of described well heater comes automatic heat-exchanger.
Described handling equipment can be machine for zipper.
Described rotary valve is directly installed on the lower nozzle of cyclonic separator.
Described cyclonic separator and bag filter all have the heat tracing of hot-water return, to avoid vapor condensation.
For guarantee that dry loop carries out under normal pressure and little negative pressure, from the drying sludge process loop, extract a small amount of steam and enter condensing tower, water vapour is by the water condensation of reverse circulation.Condensation process adopts closed cycle to save the consumption of water.
In the described step (7), in condensing tower leads to the pipeline of cement kiln, be provided with mist eliminator, be used for filtering the droplet of saturated gas (waste gas of namely discharging from the condensing tower top), and droplet isolated to get off and be back in the condensing tower.
The principle of work of turbine thin layer drying machine:
The cardinal principle of turbine-dry technology is to produce the raw material thin layer.Raw material under powerful eddy effect at inner continuous moving and be attached to inboard wall of cylinder block.By the thin layer of this material, can under very high heat exchange coefficient and thermo-efficiency, carry out heat exchange.
The product that need be dried is admitted in the cylindrical container of horizontal, turbine agitator wherein with the raw material centrifugation to inwall.
Thermal conduction mainly is the indirect conduction by the deep fat in cylinder body container concentric liner, and part is to obtain by the preheated air convection current.This drying process only need use a small amount of air, need not direct flame heating.Therefore, be specially adapted to not change the raw material recycling system of product property.
The mud that is dried enters turbine thin layer drying machine by loader, and the lining internal recycle of drying machine has temperature up to the thermal oil of 280～300 degree, makes the inwall of reactor obtain evenly effectively heating.On charging ground simultaneously, the process air of 220～260 degree enters drying machine from homonymy.Be equipped with the blade of different curves at different positions from the coaxial rotor of cylindrical reactor, water-containing sludge is formed one deck material thin layer by the eddy current that the high speed rotating blade forms at reactor wall under the process air of following current drives, this thin layer moves from reactor feed one side direction opposite side spiral with certain speed, finishes the operations such as dry.
Continous way turbine thin layer drying machine is furnished with the hot oiling lining.Mud is by heating mud with the thermal conduction of hot wall and with two kinds of indirect heat exchange of thermal convection of the cycling hot air-flow that flows in the same way and dry.Turbodrier produces eddy current, and product travels forward along the inwall of turbodrier heat under the action of the centrifugal.
Turbine is by a three-phase machine and belt drives.The preheated air inlet mouth is arranged in the ingress, and the entrance of the mud that need be dried.Rotatable parts are coated with high-abrasive material.The hot oiling lining is by the carbon steel manufacturing, and by rock wool non-conductive fibre parcel heat insulation (100mm is thick), the outside is protected by stainless steel casing (0.5mm is thick).
Advantage of the present invention is:
1, heat-obtaining derives from the cement kiln decomposing furnace, needn't build separately boiler.
2, the heat drying automation degree of equipment is high, safety performance is good, thermal transition efficient is higher.
3, mud directly is delivered to burning in the decomposing furnace after the drying, has avoided the danger of existence in the dewatered sludge storage, can utilize the alternative decomposing furnace partial fuel coal of heat of dewatered sludge burning release simultaneously, the energy recovery of realization dewatered sludge.
4, mud burns under the high temperature of 850 ℃ of decomposing furnaces, the long burning thoroughly of the residence time, solve tradition and burn the problem that has the De generation of dioxin, the flying dust of sludge creation is fired into cement as cement raw material after burning under 1450 ℃ of high temperature of cement kiln, does not exist tradition to burn the problem of the flying ash that exists.
5, the waste gas that produces in the sludge drying is delivered to cement kiln by pipeline and burns, and burns thoroughly, compares with traditional deodorizing to have advantage.
6, the mud lime-ash is in being fired into the process of cement, and the heavy metal in the lime-ash is cured in the lattice of cement clinker, solves thoroughly heavy metal pollution problem.Comparing cement kiln mummification disposing sludge with traditional mummification is a kind of disposal options of processing the most thoroughly.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Accompanying drawing is the process flow sheet of the treatment process of sludge drying.
Embodiment
The treatment process of the described a kind of sludge drying of present embodiment, technical process be as shown in drawings:
(1) from the wet mud of each sewage work after metering, at first enter mud and receive the storehouse, the drag conveyer that then receives the bottom, storehouse with mud is sent into wet sludge storage bin and is stored;
(2) mud in the wet sludge storage bin is admitted to moisture eliminator and carries out continuous mummification, the drying medium of described moisture eliminator is thermal oil, dry heat is all from cement kiln, by extract 850～900 degree high-temperature gases at the cement kiln decomposing furnace, the heat of high-temperature flue gas through heat exchanger the heat transferred thermal oil, thermal oil is recycled and is heated to 280～300 degree, the wet mud of heat transferred the most at last, make drying sludge (mud is heated drying in moisture eliminator), moisture is reduced to 25%～35% from 80%; Sludge volume after the mummification only is original 1/3～1/2.
(3) dried particle and gas enter cyclonic separator, and solid substance and gas are separated because of the density difference in cyclonic separator, and mud granule is collected in the bottom, is discharged by rotary valve;
(4) cooled mud granule is sent in the cement kiln decomposing furnace through handling equipment and is burned; Described dried sludge calorific value is about 2600 kilocalories, and burning in decomposing furnace can Substitute For Partial fuel.
(5) gas that contains water vapour and a small amount of ultrafine particle is sent to bag filter, and filtering gas and steam in bag filter are separated the superfine product of small particle size, and the fine particle product of separating sinks in the bottom, is sent to handling equipment; Mud granule in step (4) is sent in the cement kiln decomposing furnace and is burned;
(6) after the isolated vapor portion of bag filter extracted circulation through whizzer, a part was heated the top that returns to moisture eliminator again through well heater, and all the other steam enter the condensing tower cooling;
(7) cooled water of condensation (being waste water) is collected in the outflow of condensing tower bottom, then delivers to sewage treatment unit; The waste gas of discharging from the condensing tower top is sent to cement kiln by the centrifugal blower extraction and burns.Water after sewage treatment unit is processed can come back in the technique and utilize, and accomplishes the zero release of sewage.
Described mud receives the storehouse and is divided into 2, can hold altogether 80 tons of wet mud.
Described wet sludge storage bin divides a storehouse and b storehouse, can hold altogether 300 tons of wet mud.
Described moisture eliminator adopts turbine thin layer drying machine.In the present embodiment, described moisture eliminator adopts VOMM turbine thin layer drying machine.
In the described step (2), being admitted to the maximum that moisture eliminator carries out the wet mud of continuous mummification is 4 tons/hour.
The heat of described well heater comes automatic heat-exchanger.
In the present embodiment, described handling equipment is machine for zipper.
Described rotary valve is directly installed on the lower nozzle of cyclonic separator.
Described cyclonic separator and bag filter all have the heat tracing of hot-water return, to avoid vapor condensation.
In the described step (7), in condensing tower leads to the pipeline of cement kiln, be provided with mist eliminator, be used for filtering the droplet of saturated gas (waste gas of namely discharging from the condensing tower top), and droplet isolated to get off and be back in the condensing tower.
In the present embodiment, the sludge water content after the mummification is reduced to 25% from 80%, and volume only is original 1/3.
Per-cents all among the present invention all are weight percentage.
Claims (9)
1. the treatment process of a sludge drying, it is characterized in that: it may further comprise the steps:
(1) from the wet mud of each sewage work after metering, at first enter mud and receive the storehouse, the drag conveyer that then receives the bottom, storehouse with mud is sent into wet sludge storage bin and is stored;
(2) mud in the wet sludge storage bin is admitted to moisture eliminator and carries out continuous mummification, the drying medium of described moisture eliminator is thermal oil, dry heat is all from cement kiln, by extract 850～900 degree high-temperature gases at the cement kiln decomposing furnace, the heat transferred thermal oil, thermal oil is recycled and is heated to 280～300 degree the heat of high-temperature gas, the most at last the wet mud of heat transferred through heat exchanger, make drying sludge, moisture is reduced to 25%～35% from 80%;
(3) dried particle and gas enter cyclonic separator, and solid substance and gas are separated because of the density difference in cyclonic separator, and mud granule is collected in the bottom, is discharged by rotary valve;
(4) cooled mud granule is sent in the cement kiln decomposing furnace through handling equipment and is burned;
(5) gas that contains water vapour and a small amount of ultrafine particle is sent to bag filter, and filtering gas and steam in bag filter are separated the superfine product of small particle size, and the fine particle product of separating sinks in the bottom, is sent to handling equipment; Mud granule in step (4) is sent in the cement kiln decomposing furnace and is burned;
(6) after the isolated vapor portion of bag filter extracted circulation through whizzer, a part was heated the top that returns to moisture eliminator again through well heater, and all the other steam enter the condensing tower cooling;
(7) cooled water of condensation is collected in the outflow of condensing tower bottom, then delivers to sewage treatment unit; The waste gas of discharging from the condensing tower top is sent to cement kiln by the centrifugal blower extraction and burns.
2. the treatment process of sludge drying as claimed in claim 1 is characterized in that: described mud receives the storehouse and is divided into 2, holds altogether 80 tons of wet mud.
3. the treatment process of sludge drying as claimed in claim 1, it is characterized in that: described wet sludge storage bin divides a storehouse and b storehouse, holds altogether 300 tons of wet mud.
4. the treatment process of sludge drying as claimed in claim 1 is characterized in that: described moisture eliminator employing turbine thin layer drying machine.
5. the treatment process of sludge drying as claimed in claim 1 is characterized in that: in the described step (2), being admitted to the maximum that moisture eliminator carries out the wet mud of continuous mummification is 4 tons/hour.
6. the treatment process of sludge drying as claimed in claim 1, it is characterized in that: described handling equipment is machine for zipper.
7. the treatment process of sludge drying as claimed in claim 1, it is characterized in that: described rotary valve is directly installed on the lower nozzle of cyclonic separator.
8. the treatment process of sludge drying as claimed in claim 1, it is characterized in that: described cyclonic separator and bag filter all have the heat tracing of hot-water return, to avoid vapor condensation.
9. the treatment process of sludge drying as claimed in claim 1, it is characterized in that: in the described step (7), in condensing tower leads to the pipeline of cement kiln, be provided with mist eliminator, be used for filtering the droplet of saturated gas, and droplet isolated to get off and be back in the condensing tower.
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| CN201210253428.8A CN102964047B (en) | 2012-07-23 | 2012-07-23 | Treatment method of sludge drying |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103708701A (en) * | 2013-12-31 | 2014-04-09 | 一重集团大连设计研究院有限公司 | After-treatment system of dried fine-powder sludge and treatment method |
| CN104341084A (en) * | 2013-08-02 | 2015-02-11 | 天华化工机械及自动化研究设计院有限公司 | Energy-saving type dyeing sludge drying system for combined heat and power generation |
| CN105152503A (en) * | 2015-08-28 | 2015-12-16 | 大连爱德摩设备制造有限公司 | Efficient treatment system of oil sludge |
| CN105222533A (en) * | 2015-10-21 | 2016-01-06 | 上海市离心机械研究所有限公司 | The method of operating of centrifugal drying system |
| CN107879594A (en) * | 2017-12-20 | 2018-04-06 | 贝莱特空调有限公司 | A kind of energy recovery type temperature adjusting and dehumidifying sludge drier system |
| CN109650695A (en) * | 2018-12-25 | 2019-04-19 | 广东闻扬环境科技有限公司 | Sludge drying mechanism and drying method for sludge |
| CN110586620A (en) * | 2019-09-18 | 2019-12-20 | 北京金隅琉水环保科技有限公司 | Metering and weighing device, fly ash treatment system and fly ash treatment method |
| CN110759625A (en) * | 2019-11-11 | 2020-02-07 | 烟台润达垃圾处理运营有限公司 | Sludge drying system |
| CN112443849A (en) * | 2020-11-20 | 2021-03-05 | 安徽国祯生态科技有限公司 | Biomass power plant coupling sludge drying incineration method |
| CN112919518A (en) * | 2021-02-05 | 2021-06-08 | 丁学锋 | Method for recovering granular calcium fluoride product from calcium fluoride sludge resource |
| CN115286208A (en) * | 2022-08-25 | 2022-11-04 | 华新水泥股份有限公司 | System and method for drying and co-processing sludge by using waste heat of cement kiln |
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| CN101643305A (en) * | 2009-08-20 | 2010-02-10 | 浙江大学 | Method for integrating sludge drying by using brickkiln fume afterheat and brick making by using sludge |
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Patent Citations (3)
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| JPH0615297A (en) * | 1992-07-02 | 1994-01-25 | Onoda Cement Co Ltd | Dehydrating, drying and incinerating system for sludge |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104341084A (en) * | 2013-08-02 | 2015-02-11 | 天华化工机械及自动化研究设计院有限公司 | Energy-saving type dyeing sludge drying system for combined heat and power generation |
| CN104341084B (en) * | 2013-08-02 | 2015-12-02 | 天华化工机械及自动化研究设计院有限公司 | For the energy-saving printing and dyeing sludge dehumidification system of cogeneration |
| CN103708701A (en) * | 2013-12-31 | 2014-04-09 | 一重集团大连设计研究院有限公司 | After-treatment system of dried fine-powder sludge and treatment method |
| CN105152503A (en) * | 2015-08-28 | 2015-12-16 | 大连爱德摩设备制造有限公司 | Efficient treatment system of oil sludge |
| CN105222533A (en) * | 2015-10-21 | 2016-01-06 | 上海市离心机械研究所有限公司 | The method of operating of centrifugal drying system |
| CN107879594A (en) * | 2017-12-20 | 2018-04-06 | 贝莱特空调有限公司 | A kind of energy recovery type temperature adjusting and dehumidifying sludge drier system |
| CN109650695A (en) * | 2018-12-25 | 2019-04-19 | 广东闻扬环境科技有限公司 | Sludge drying mechanism and drying method for sludge |
| CN110586620A (en) * | 2019-09-18 | 2019-12-20 | 北京金隅琉水环保科技有限公司 | Metering and weighing device, fly ash treatment system and fly ash treatment method |
| CN110759625A (en) * | 2019-11-11 | 2020-02-07 | 烟台润达垃圾处理运营有限公司 | Sludge drying system |
| CN112443849A (en) * | 2020-11-20 | 2021-03-05 | 安徽国祯生态科技有限公司 | Biomass power plant coupling sludge drying incineration method |
| CN112919518A (en) * | 2021-02-05 | 2021-06-08 | 丁学锋 | Method for recovering granular calcium fluoride product from calcium fluoride sludge resource |
| CN115286208A (en) * | 2022-08-25 | 2022-11-04 | 华新水泥股份有限公司 | System and method for drying and co-processing sludge by using waste heat of cement kiln |
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Effective date of registration: 20161025 Address after: 102202 Beijing city Changping District Machi Town Beixiaoying village of Beijing cement factory Patentee after: Beijing Jinyu North Water Environmental Protection Science and technology limited company Address before: 102202 Beijing city Changping District Machi Town Beixiaoying Village East Patentee before: Beijing Cement Plant Co., Ltd. |