CN104671633A - Steam condensate preheating and steam drying two-stage energy-saving sludge drying method - Google Patents
Steam condensate preheating and steam drying two-stage energy-saving sludge drying method Download PDFInfo
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- CN104671633A CN104671633A CN201510113359.4A CN201510113359A CN104671633A CN 104671633 A CN104671633 A CN 104671633A CN 201510113359 A CN201510113359 A CN 201510113359A CN 104671633 A CN104671633 A CN 104671633A
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to a steam condensate preheating and steam drying two-stage energy-saving sludge drying method. The method comprises the following steps: (1) driving wet sludge into a sludge preheater to be indirectly contacted with steam condensate obtained by steam drying to form preheated wet sludge and condensation water respectively, (2) continuously and uniformly adding the preheated wet sludge into a drier, allowing saturated steam or superheated steam to enter the drier at the same time to form dry sludge, high-temperature condensate and smelly high-humidity tail gas, (3) allowing the high-temperature condensate to enter a condensate tank, and enter the sludge preheater through a condensate pump to preheat the wet sludge, (4) after dedusting the smelly high-humidity tail gas with a duster, obtaining sludge powder and high-humidity tail gas respectively, allowing the sludge powder to return to the drier through a rotary discharger, and (5) allowing the high-humidity tail gas to enter a condenser for cooling and condensation, and obtaining cooling return water, sewage and tail gas respectively after heat exchange. The method can effectively improve steam heat utilization efficiency.
Description
Technical field
The present invention relates to sludge drying and energy-saving and cost-reducing technical field, particularly relate to a kind of steam condensate preheating+steam drying two-stage type energy-saving sludge drying means.
Background technology
In existing sludge drying full scale plant, the heat transfer by conduction type drying machine of the types such as drying plant many employings disc dryer, blade dryer and film drier, steam condensate is obtained after drying sludge, generally the pressure of steam condensate is 0.5 ~ 0.6MPa, temperature is 158 ~ 164 DEG C, and the temperature of steam condensate is high, and the sensible heat of steam condensate does not make full use of, steam heat utilization ratio is low, and drying process is relatively not energy-conservation.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of steam condensate preheating+steam drying two-stage type energy-saving sludge drying means of effective raising steam heat utilising efficiency.
For solving the problem, a kind of steam condensate preheating of the present invention+steam drying two-stage type energy-saving sludge drying means, comprises the following steps:
(1) by the water ratio being placed in feed bin be 60 ~ 85% wet mud be pressurized to 0.6 ~ 1.5MPa by the sludge pump of described bin bottom after squeeze in establish the mud preheater of two intermeshing band hollow blade hot boxs, now, from the steam condensate of steam drying gained and described wet mud indirect contact in described mud preheater, described wet mud is heated, and the preheating obtaining temperature≤99 DEG C is respectively wet the condensed water of mud and temperature≤50 DEG C;
(2) what mud continuous uniform was wet in the preheating of described temperature≤99 DEG C joins in drying machine; Simultaneously, temperature is that the saturation steam of 140 DEG C ~ 164 DEG C or superheated vapour distribute in hollow hot box, blade and the chuck also entering described drying machine by pipeline, transfer heat to described preheating to wet mud, wet part evaporation that described preheating is wet in mud, obtain temperature≤90 DEG C respectively, the dewatered sludge of water ratio≤40%, condensed 140 DEG C ~ 164 DEG C high temperature lime sets and temperature be 90 ~ 120 DEG C, pressure be-100 ~-500Pa, relative humidity be 70 ~ 90% contain smelly high humidity tail gas; The spiral conveyer of dewatered sludge through being connected with the outlet of described drying machine of described temperature≤90 DEG C, water ratio≤40% draws off collection;
(3) described condensed 140 DEG C ~ 164 DEG C high temperature lime sets enter in lime set tank, and enter in described mud preheater through lime set pump and carry out preheating for described wet mud;
(4) described temperature is 90 ~ 120 DEG C, pressure is-100 ~-500Pa, relative humidity be 70 ~ 90% containing smelly high humidity tail gas after fly-ash separator dedusting, obtain temperature≤90 after mud powder and purification DEG C respectively, relative humidity be 70 ~ 90% high humidity tail gas; Described mud powder is through returning in described drying machine with the rotary discharger be connected bottom described fly-ash separator;
(5) temperature≤90 after described purification DEG C, relative humidity be 70 ~ 90% high humidity tail gas enter condenser; Meanwhile, in the circulating cooling of temperature≤32 DEG C, water enters described condenser and carries out cooling and condensation, obtains the tail gas of the cooling backwater of temperature≤37 DEG C, the sewage of temperature≤40 DEG C and temperature≤40 DEG C after heat exchange respectively; The cooling backwater of described temperature≤37 DEG C is discharged through cooling back water pipe; The sewage of described temperature≤40 DEG C relies on deadweight to flow to sewage lagoon; The tail gas of described temperature≤40 DEG C enters follow-up exhaust system through induced draft fan and carries out aftertreatment.
Described step (1) in wet mud refer to municipal sludge and comprise the industrial sludge of printing and dyeing sludge, electroplating sludge, paper mill sludge.
Described step (1) in mud preheater refer in the worm conveyor of blade dryer, disc dryer and jacketed any one.
Described step (1) in sludge pump be screw sludge pump or plunger tpe sludge pump.
Described step (2) in drying machine refer in blade dryer, disc dryer, steam-tube rotatory dryer any one.
Described step (4) in fly-ash separator be cyclonic separator, sack cleaner, any one in electric precipitation.
Described step (5) in condenser be shell-and-tube, board-like, finned in any one.
Described step (5) in temperature≤32 DEG C circulating cooling on water refer to the sewage of sewage work's settling pool.
The present invention compared with prior art has the following advantages:
1, dehumidification system steam heat rate is high, and system is relatively energy-conservation.
The wet mud of the steam condensate that the present invention utilizes drying sludge to produce to import carries out preheating, make full use of the heat in steam condensate, the steam that wet drying sludge after preheating consumes reduces, thus improves the utilization ratio of steam, decreases drying sludge steam consumption.In whole wet drying sludge process, steam heat utilization ratio compared with prior art, former basis can improve more than 20%.Flow process in hinge structure, the hot interest rate of steam is high, and drying process steam consumption is few, and systematicness is to energy-conservation.
2, dehumidification system is designed to closed type, and adopt negative-pressure operation, drying process environmental pollution is little.
Dehumidification system of the present invention adopts integral sealing design.The feed bin structure placing wet mud is closed type, and drying machine charging adopts sludge pumping mode, and after completing after drying, dewatered sludge is discharged through worm conveyor and entered delivery system, does not have mud to leak in drying process.Dried tail gas enters dust-removal system by sealing-duct, and discharge after fly-ash separator and condenser purification and enter follow-up system and process, dehumidification system process adopts negative-pressure operation, leaks during normal running without dried tail gas.The dry waste water produced enters settling tank through sealing-duct.Whole drying process is little to environmental hazard.
3, the tail gas of dehumidification system generation is few.
Dehumidification system of the present invention is designed to sealed structure, and the leakage of system is little.Mainly comprise wetting vapour and non-condensable gas and a small amount of dust that mud evaporates in dried tail gas, after fly-ash separator and condenser, remove dust and wetting vapour, the tail gas that dehumidification system produces is mainly the non-condensable gas that a small amount of mud evaporates.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is process flow sheet of the present invention.
In figure: 1-feed bin 2-sludge pump 3-mud preheater 4-induced draft fan 5-drying machine 6-spiral conveyer 7-rotary discharger 8-fly-ash separator 9-condenser 10-lime set tank 11-lime set pump.
Embodiment
As shown in Figure 1, a kind of steam condensate preheating+steam drying two-stage type energy-saving sludge drying means, comprises the following steps:
(1) by the water ratio being placed in feed bin 1 be 60 ~ 85% wet mud be pressurized to 0.6 ~ 1.5MPa by the sludge pump 2 bottom feed bin 1 after squeeze in establish the mud preheater 3 of two intermeshing band hollow blade hot boxs, now, from the steam condensate of steam drying gained and wet mud indirect contact in mud preheater 3, wet mud is heated, and the preheating obtaining temperature≤99 DEG C is respectively wet the condensed water of mud and temperature≤50 DEG C.
Wherein:
Wet mud refers to municipal sludge and comprises the industrial sludge of printing and dyeing sludge, electroplating sludge, paper mill sludge.
Mud preheater 3 refer in the worm conveyor of blade dryer, disc dryer and jacketed any one.
Sludge pump 2 is screw sludge pump or plunger tpe sludge pump.
(2) the wet mud continuous uniform after the preheating of temperature≤99 DEG C join in drying machine 5; Simultaneously, temperature is that the saturation steam of 140 DEG C ~ 164 DEG C or superheated vapour distribute in hollow hot box, blade and the chuck also entering drying machine 5 by pipeline, transfer heat to wet mud, make the wet part evaporation in wet mud, obtain temperature≤90 DEG C respectively, the dewatered sludge of water ratio≤40%, condensed 140 DEG C ~ 164 DEG C high temperature lime sets and temperature be 90 ~ 120 DEG C, pressure be-100 ~-500Pa, relative humidity be 70 ~ 90% contain smelly high humidity tail gas; The spiral conveyer 6 of dewatered sludge through being connected with the outlet of drying machine 5 of temperature≤90 DEG C, water ratio≤40% draws off collection.
Wherein: drying machine 5 refer in blade dryer, disc dryer, steam-tube rotatory dryer any one.
(3) condensed 140 DEG C ~ 164 DEG C high temperature lime sets enter in lime set tank 10, and enter in mud preheater 3 as wet mud carries out preheating through lime set pump 11.
(4) temperature is 90 ~ 120 DEG C, pressure is-100 ~-500Pa, relative humidity be 70 ~ 90% containing smelly high humidity tail gas after fly-ash separator 8 dedusting, obtain temperature≤90 after mud powder and purification DEG C respectively, relative humidity be 70 ~ 90% high humidity tail gas; Mud powder is through returning in drying machine 5 with the rotary discharger 7 be connected bottom fly-ash separator 8.
Wherein: fly-ash separator 8 is cyclonic separator, sack cleaner, any one in electric precipitation.
(5) temperature≤90 DEG C after purification, relative humidity be 70 ~ 90% high humidity tail gas enter condenser 9; Meanwhile, in the circulating cooling of temperature≤32 DEG C, water enters condenser 9 and carries out cooling and condensation, obtains the tail gas of the cooling backwater of temperature≤37 DEG C, the sewage of temperature≤40 DEG C and temperature≤40 DEG C after heat exchange respectively; The cooling backwater of temperature≤37 DEG C is discharged through cooling back water pipe; The sewage of temperature≤40 DEG C relies on deadweight to flow to sewage lagoon; The tail gas of temperature≤40 DEG C enters follow-up exhaust system through induced draft fan 4 and carries out aftertreatment.
Wherein: condenser 9 be shell-and-tube, board-like, finned in any one.
In the circulating cooling of temperature≤32 DEG C, water refers to the sewage of sewage work's settling pool.
Claims (8)
1. steam condensate preheating+steam drying two-stage type energy-saving sludge drying means, comprises the following steps:
(1) by the water ratio being placed in feed bin (1) be 60 ~ 85% wet mud be pressurized to 0.6 ~ 1.5MPa by the sludge pump (2) of described feed bin (1) bottom after squeeze in establish the mud preheater (3) of two intermeshing band hollow blade hot boxs, now, from the steam condensate of steam drying gained and described wet mud indirect contact in described mud preheater (3), described wet mud is heated, and the preheating obtaining temperature≤99 DEG C is respectively wet the condensed water of mud and temperature≤50 DEG C;
(2) what mud continuous uniform was wet in the preheating of described temperature≤99 DEG C joins in drying machine (5); Simultaneously, temperature is that the saturation steam of 140 DEG C ~ 164 DEG C or superheated vapour distribute in hollow hot box, blade and the chuck also entering described drying machine (5) by pipeline, transfer heat to described preheating to wet mud, wet part evaporation that described preheating is wet in mud, obtain temperature≤90 DEG C respectively, the dewatered sludge of water ratio≤40%, condensed 140 DEG C ~ 164 DEG C high temperature lime sets and temperature be 90 ~ 120 DEG C, pressure be-100 ~-500Pa, relative humidity be 70 ~ 90% contain smelly high humidity tail gas; The spiral conveyer (6) of dewatered sludge through being connected with the outlet of described drying machine (5) of described temperature≤90 DEG C, water ratio≤40% draws off collection;
(3) described condensed 140 DEG C ~ 164 DEG C high temperature lime sets enter in lime set tank (10), and enter in described mud preheater (3) through lime set pump (11) and carry out preheating for described wet mud;
(4) described temperature is 90 ~ 120 DEG C, pressure is-100 ~-500Pa, relative humidity be 70 ~ 90% containing smelly high humidity tail gas after fly-ash separator (8) dedusting, obtain temperature≤90 after mud powder and purification DEG C respectively, relative humidity be 70 ~ 90% high humidity tail gas; The rotary discharger (7) of described mud powder through being connected with described fly-ash separator (8) bottom returns in described drying machine (5);
(5) temperature≤90 after described purification DEG C, relative humidity be 70 ~ 90% high humidity tail gas enter condenser (9); Meanwhile, in the circulating cooling of temperature≤32 DEG C, water enters described condenser (9) and carries out cooling and condensation, obtains the tail gas of the cooling backwater of temperature≤37 DEG C, the sewage of temperature≤40 DEG C and temperature≤40 DEG C after heat exchange respectively; The cooling backwater of described temperature≤37 DEG C is discharged through cooling back water pipe; The sewage of described temperature≤40 DEG C relies on deadweight to flow to sewage lagoon; The tail gas of described temperature≤40 DEG C enters follow-up exhaust system through induced draft fan (4) and carries out aftertreatment.
2. a kind of steam condensate preheating as claimed in claim 1+steam drying two-stage type energy-saving sludge drying means, is characterized in that: described step (1) in wet mud refer to municipal sludge and comprise the industrial sludge of printing and dyeing sludge, electroplating sludge, paper mill sludge.
3. a kind of steam condensate preheating as claimed in claim 1+steam drying two-stage type energy-saving sludge drying means, is characterized in that: described step (1) in mud preheater (3) refer in the worm conveyor of blade dryer, disc dryer and jacketed any one.
4. a kind of steam condensate preheating as claimed in claim 1+steam drying two-stage type energy-saving sludge drying means, is characterized in that: described step (1) in sludge pump (2) be screw sludge pump or plunger tpe sludge pump.
5. a kind of steam condensate preheating as claimed in claim 1+steam drying two-stage type energy-saving sludge drying means, is characterized in that: described step (2) in drying machine (5) refer in blade dryer, disc dryer, steam-tube rotatory dryer any one.
6. a kind of steam condensate preheating as claimed in claim 1+steam drying two-stage type energy-saving sludge drying means, is characterized in that: described step (4) in fly-ash separator (8) be cyclonic separator, sack cleaner, any one in electric precipitation.
7. a kind of steam condensate preheating as claimed in claim 1+steam drying two-stage type energy-saving sludge drying means, is characterized in that: described step (5) in condenser (9) be shell-and-tube, board-like, finned in any one.
8. a kind of steam condensate preheating as claimed in claim 1+steam drying two-stage type energy-saving sludge drying means, is characterized in that: described step (5) in temperature≤32 DEG C circulating cooling on water refer to the sewage of sewage work's settling pool.
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| CN201510113359.4A CN104671633A (en) | 2015-03-16 | 2015-03-16 | Steam condensate preheating and steam drying two-stage energy-saving sludge drying method |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105417919A (en) * | 2015-11-12 | 2016-03-23 | 上海环境卫生工程设计院有限公司 | Sludge indirect heat drying system and drying process thereof |
| CN105509459A (en) * | 2016-01-14 | 2016-04-20 | 江苏搏斯威化工设备工程有限公司 | Heat energy utilizing system of hollow blade drying machine |
| CN106839735A (en) * | 2017-04-09 | 2017-06-13 | 赵永潮 | A kind of hot-air drying unit of large-size particles |
| CN107487979A (en) * | 2017-09-19 | 2017-12-19 | 深圳市能源环保有限公司 | A kind of backheat method sludge heat drying system |
| CN107915389A (en) * | 2017-10-27 | 2018-04-17 | 北京中电联节能技术有限公司 | The indirect heat drying method of two-part Integral sludge and anhydration system |
| CN108362096A (en) * | 2018-02-12 | 2018-08-03 | 南京高源环保工程有限公司 | A kind of material drying system and its drying means containing escaping gas |
| CN109028887A (en) * | 2017-06-08 | 2018-12-18 | 中国石油化工股份有限公司 | A kind of glue residue low temperature reduction treatment system and its application method |
| CN109368981A (en) * | 2018-12-25 | 2019-02-22 | 烟台清泉实业有限公司 | A kind of sludge semi-dry processing system and processing method |
| CN109761474A (en) * | 2019-03-11 | 2019-05-17 | 深圳市瑞升华科技股份有限公司 | Energy-saving sludge drying system and drying method for sludge |
| CN110215790A (en) * | 2019-07-02 | 2019-09-10 | 江苏康泰环保股份有限公司 | A kind of low-heat steam total heat recovery dedusting dehumidifying seperator |
| CN110627343A (en) * | 2019-11-01 | 2019-12-31 | 福建龙净环保股份有限公司 | Disc dryer |
| CN110746081A (en) * | 2019-11-27 | 2020-02-04 | 中国华能集团清洁能源技术研究院有限公司 | Sludge drying system with gradient utilization of heat source energy |
| CN111138067A (en) * | 2019-12-30 | 2020-05-12 | 江苏绿威环保科技有限公司 | Dryer waste heat recovery system |
| CN111437562A (en) * | 2020-05-06 | 2020-07-24 | 大唐环境产业集团股份有限公司 | Fly ash ammonium removal system with preheating device and ammonium removal method |
| CN114538741A (en) * | 2022-03-04 | 2022-05-27 | 杰瑞环保科技有限公司 | Sludge drying system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105417919A (en) * | 2015-11-12 | 2016-03-23 | 上海环境卫生工程设计院有限公司 | Sludge indirect heat drying system and drying process thereof |
| CN105509459A (en) * | 2016-01-14 | 2016-04-20 | 江苏搏斯威化工设备工程有限公司 | Heat energy utilizing system of hollow blade drying machine |
| CN106839735A (en) * | 2017-04-09 | 2017-06-13 | 赵永潮 | A kind of hot-air drying unit of large-size particles |
| CN109028887A (en) * | 2017-06-08 | 2018-12-18 | 中国石油化工股份有限公司 | A kind of glue residue low temperature reduction treatment system and its application method |
| CN107487979A (en) * | 2017-09-19 | 2017-12-19 | 深圳市能源环保有限公司 | A kind of backheat method sludge heat drying system |
| CN107915389A (en) * | 2017-10-27 | 2018-04-17 | 北京中电联节能技术有限公司 | The indirect heat drying method of two-part Integral sludge and anhydration system |
| CN108362096A (en) * | 2018-02-12 | 2018-08-03 | 南京高源环保工程有限公司 | A kind of material drying system and its drying means containing escaping gas |
| CN109368981A (en) * | 2018-12-25 | 2019-02-22 | 烟台清泉实业有限公司 | A kind of sludge semi-dry processing system and processing method |
| CN109761474A (en) * | 2019-03-11 | 2019-05-17 | 深圳市瑞升华科技股份有限公司 | Energy-saving sludge drying system and drying method for sludge |
| CN110215790A (en) * | 2019-07-02 | 2019-09-10 | 江苏康泰环保股份有限公司 | A kind of low-heat steam total heat recovery dedusting dehumidifying seperator |
| CN110627343A (en) * | 2019-11-01 | 2019-12-31 | 福建龙净环保股份有限公司 | Disc dryer |
| CN110746081A (en) * | 2019-11-27 | 2020-02-04 | 中国华能集团清洁能源技术研究院有限公司 | Sludge drying system with gradient utilization of heat source energy |
| CN111138067A (en) * | 2019-12-30 | 2020-05-12 | 江苏绿威环保科技有限公司 | Dryer waste heat recovery system |
| CN111437562A (en) * | 2020-05-06 | 2020-07-24 | 大唐环境产业集团股份有限公司 | Fly ash ammonium removal system with preheating device and ammonium removal method |
| CN114538741A (en) * | 2022-03-04 | 2022-05-27 | 杰瑞环保科技有限公司 | Sludge drying system |
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