CN112174483A - Thermal power generating unit sludge coupling power generation system utilizing flue gas drying - Google Patents
Thermal power generating unit sludge coupling power generation system utilizing flue gas drying Download PDFInfo
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- CN112174483A CN112174483A CN202011097743.7A CN202011097743A CN112174483A CN 112174483 A CN112174483 A CN 112174483A CN 202011097743 A CN202011097743 A CN 202011097743A CN 112174483 A CN112174483 A CN 112174483A
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- Prior art keywords
- sludge
- flue gas
- drying
- generating unit
- generation system
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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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/033—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment comminuting or crushing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
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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
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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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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- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a thermal power generating unit sludge drying coupling power generation system by utilizing flue gas, which comprises a sludge storage bin, a sludge conveying pipeline, a flue gas conveying pipeline, a sludge drier, a fan-mill type crusher, a dried sludge powder conveying pipeline, a sludge combustor and a boiler, wherein the sludge storage bin is used for storing sludge; wherein, the export in sludge storage storehouse communicates to the top sludge inlet of sludge drying ware through mud conveying pipeline, and the flue gas of boiler communicates to the top flue gas entry of sludge drying ware through flue gas conveying pipeline, and the mixed export of bottom sludge flue gas of sludge drying ware communicates to the sludge burner through fan mill formula breaker and mummified sludge powder conveying pipeline, sends into the boiler through the sludge burner. The invention can effectively decompose toxic and harmful substances in the sludge and can not influence the standard emission of the unit smoke pollutants.
Description
Technical Field
The invention belongs to the technical field of sludge treatment and disposal, and particularly relates to a flue gas drying sludge coupling power generation system for a thermal power generating unit.
Background
Along with the development of the industry and the acceleration of the urbanization process in China, the treatment rate of urban sewage is improved, and a large amount of sludge is generated. The sludge is a pollutant with complex properties, high pollutant content and huge potential environmental risk, is a liquid-solid substance with high water content, and contains a large amount of pathogenic bacteria, parasitic ova, and toxic and harmful substances of heavy metals such as chromium, mercury and the like. The sludge has seriously influenced the production and life of people and causes serious pollution to the environment, and the municipal sludge treatment problem becomes a large environmental protection problem to be urgently solved in the current society.
Odor emitted by sludge pollutes air, pathogenic bacteria can potentially threaten human health, and heavy metals and toxic and harmful organic matters pollute earth surfaces and underground water systems. Since the domestic sludge treatment starts late, many cities do not bring sludge treatment places into city general planning, so that many treatment plants are difficult to find suitable sludge treatment methods and sludge disposal places; the basic of sludge utilization in China is weak, people have serious defects in the understanding of sludge utilization, the problem of final treatment of sludge is lack of attention, and hidden dangers are left for the final treatment of some harmful sludge; the utilization rate of the sludge is not very high, and a part of sludge of a sewage plant is directly stacked in the outsides of the environmental sanitation departments only by storage, and particularly, the method is adopted in some southern cities in China.
The sludge coal-fired coupling power generation is an approach for effectively solving the problem of urban sludge treatment, and the national energy agency and the environmental protection department propose in 'notice on development of technical improvement and pilot work of coal-fired coupling biomass power generation': the method is characterized in that 36 key cities such as direct prefecture cities, provincial cities and planned single-row cities, large in garbage and sludge production amount and difficult in land utilization or limited in space, and a coal-electricity cogeneration unit is preferably selected and coal-fired coupling garbage and sludge power generation technical improvement projects are distributed in regions mainly based on landfill.
Disclosure of Invention
The invention provides a thermal power generating unit sludge drying coupling power generation system by utilizing flue gas, aiming at the existing defects of the thermal power generating unit.
The invention is realized by adopting the following technical scheme:
a thermal power generating unit sludge drying coupling power generation system utilizing flue gas comprises a sludge storage bin, a sludge conveying pump, a sludge conveying pipeline, a flue gas conveying pipeline, a sludge dryer, a fan-mill type crusher, a dried sludge powder conveying pipeline, a sludge combustor and a boiler; wherein the content of the first and second substances,
the export in sludge storage storehouse passes through sludge transfer pump and sludge conveying pipeline and communicates to the top sludge inlet of sludge drying ware, and the flue gas of boiler communicates to the top flue gas entry of sludge drying ware through flue gas conveying pipeline, and the mixed export of bottom sludge flue gas of sludge drying ware communicates to the sludge burner through fan mill formula breaker and mummified sludge powder conveying pipeline, sends into the boiler through the sludge burner.
The invention is further improved in that a sludge atomizer is arranged at a top flue gas inlet of the sludge drier.
The invention has at least the following beneficial technical effects:
according to the thermal power generating unit coupling power generation system utilizing the flue gas dried sludge, provided by the invention, the high-temperature flue gas of the boiler is extracted to enter the sludge drying section, the sludge is dried in the drying section, the water content of the sludge is reduced, the dried sludge immediately enters the crushing section to be crushed and pulverized, and the mixture of the dried flue gas and the dried sludge powder is directly sent to the hearth for combustion, so that the sludge drying coupling power generation is realized, and the problem of pollutant treatment released in the sludge drying process is thoroughly solved. The system is simple and efficient, is easy to be integrated with a thermal power generating unit, can effectively realize reduction, harmless and recycling treatment of sludge, can effectively decompose toxic and harmful substances in the sludge, and cannot influence the standard emission of unit smoke pollutants.
Drawings
FIG. 1 is a schematic diagram of a thermal power generating unit utilizing a flue gas dried sludge coupling power generation system.
Description of reference numerals:
1. a sludge storage bin; 2. a sludge delivery pump; 3. a sludge conveying pipeline; 4. a sludge atomizer; 5. a flue gas conveying pipeline; 6. a sludge drier; 7. a fan mill crusher; 8. a dried sludge powder conveying pipeline; 9. a sludge burner; 10. a boiler.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the thermal power generating unit sludge drying coupling power generation system using flue gas provided by the invention comprises a sludge storage bin 1, a sludge delivery pump 2, a sludge delivery pipeline 3, a sludge atomizer 4, a flue gas delivery pipeline 5, a sludge dryer 6, a fan mill type crusher 7, a dried sludge powder delivery pipeline 8, a sludge burner 9 and a boiler 10.
The technical principle of the invention is as follows: sludge from a sewage treatment plant is conveyed into a sludge storage bin 1 of the system to be stored, the sludge is pressurized by a sludge conveying pump 2 at the bottom of the sludge storage bin 1, is conveyed in a sealing way by a conveying pipeline 3 and is sprayed into a sludge drier 6 by a sludge atomizer 4. The sludge drying heat source is high-temperature flue gas in a flue at the tail part of the boiler 10 and is sent into a sludge drier 6 through a flue gas conveying pipeline 5. In the sludge drier 6, sludge directly contacts with high-temperature flue gas for heat exchange, the sludge realizes the drying process and is changed into particles, then the particles enter a fan mill type crusher 7 for crushing and pulverizing, and the mixture of the dried sludge powder and the flue gas after the powder pulverization is conveyed to a sludge combustor 9 through a dried sludge powder conveying pipeline 8 and sprayed into a boiler 10 for combustion.
The invention has at least the following advantages:
(1) the technical scheme of combining sludge drying and crushing powder making is adopted, the technical problems of release of toxic and harmful odor and difficulty in treatment in the traditional sludge drying process and the mixing and conveying process of dried sludge and coal are completely solved, and waste gas generated in the sludge drying process, such as H2S, NH3, mercaptan, organic sulfide, ammonia and other trace organic component gases, and the pumped flue gas are directly sent into a hearth of the boiler 10 to be combusted, so that secondary pollution of the dried waste gas is avoided;
(2) the fan mill type crusher 7 is adopted to provide strong negative pressure while crushing and pulverizing the dried sludge so as to extract high-temperature flue gas in the boiler 10, simplify system equipment, and avoid the problems of easy abrasion and deformation, short overhaul period, large maintenance workload and the like caused by the adoption of a high-temperature fan;
(3) the sludge atomizer 4 is adopted, so that the contact area of the sludge and the high-temperature flue gas can be effectively increased, and the drying effect and process are enhanced;
(4) the high-temperature flue gas is extracted as a drying heat source, and the risk of explosion, spontaneous combustion and the like in the drying process can be effectively avoided due to the low oxygen content in the flue gas;
(5) the sludge is dried by extracting high-temperature flue gas, the dried flue gas is used as a medium for conveying sludge powder and is sent into a boiler furnace again, and for the whole system, the part of the flue gas belongs to internal circulation, has a certain effect of reducing the generation concentration of NOx in the boiler, has small influence on boiler combustion and heat absorption of all heating surfaces, and basically has no influence on the safe and stable operation of a unit.
In conclusion, the thermal power generating unit utilizing the flue gas dried sludge coupled power generation system can effectively utilize the high-temperature flue gas heat of the boiler to dry the high-moisture sludge, synchronously crush and pulverize the high-moisture sludge, then send the high-moisture sludge into the boiler for high-temperature combustion, realize harmless treatment of the sludge, have good adaptability with the unit system, and cannot influence the safe and stable operation of the original system. The invention can provide a new way for harmless incineration treatment of high-moisture sludge, and has remarkable social and environmental benefits.
Claims (6)
1. A thermal power generating unit sludge drying coupling power generation system by using flue gas is characterized by comprising a sludge storage bin (1), a sludge delivery pump (2), a sludge drier (6), a crusher, a sludge combustor (9) and a boiler (10); wherein the content of the first and second substances,
the export of sludge storage storehouse (1) communicates to the top sludge inlet of sludge drying ware (6) through sludge transfer pump (2), and the exhanst gas outlet of boiler (10) communicates to the top flue gas inlet of sludge drying ware (6), and the mixed export of bottom sludge flue gas of sludge drying ware (6) communicates to sludge burner (9) through the breaker, sends into boiler (10) through sludge burner (9).
2. The thermal power generating unit sludge-drying coupling power generation system using flue gas as claimed in claim 1, wherein a sludge atomizer (4) is further arranged at a top flue gas inlet of the sludge dryer (6).
3. The thermal power generating unit sludge coupling power generation system using flue gas drying as defined in claim 1, wherein the crusher is a fan mill type crusher (7).
4. The thermal power generating unit sludge coupling power generation system adopting flue gas drying as well as according to claim 1, wherein an outlet of the sludge storage bin (1) is communicated to a top sludge inlet of the sludge dryer (6) through a sludge delivery pump (2) and a sludge delivery pipeline (3).
5. The thermal power generating unit sludge-drying coupling power generation system using flue gas as claimed in claim 1, wherein a flue gas outlet of the boiler (10) is communicated to a top flue gas inlet of the sludge dryer (6) through a flue gas conveying pipeline (5).
6. The thermal power generating unit sludge-drying coupling power generation system using flue gas as claimed in claim 1, wherein a bottom sludge-flue gas mixing outlet of the sludge dryer (6) is communicated to the sludge combustor (9) through the crusher and a dried sludge powder conveying pipeline (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011097743.7A CN112174483A (en) | 2020-10-14 | 2020-10-14 | Thermal power generating unit sludge coupling power generation system utilizing flue gas drying |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011097743.7A CN112174483A (en) | 2020-10-14 | 2020-10-14 | Thermal power generating unit sludge coupling power generation system utilizing flue gas drying |
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| CN112174483A true CN112174483A (en) | 2021-01-05 |
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| CN202011097743.7A Pending CN112174483A (en) | 2020-10-14 | 2020-10-14 | Thermal power generating unit sludge coupling power generation system utilizing flue gas drying |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113603332A (en) * | 2021-09-03 | 2021-11-05 | 西安热工研究院有限公司 | Device and method for treating sludge by using high-temperature flue gas |
Citations (9)
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|---|---|---|---|---|
| JPS5795516A (en) * | 1980-12-04 | 1982-06-14 | Ebara Infilco Co Ltd | Incineration of sludge |
| JP2009091496A (en) * | 2007-10-10 | 2009-04-30 | Toshiba Corp | Apparatus for converting sludge into fuel |
| CN103822213A (en) * | 2014-03-19 | 2014-05-28 | 大连容大资源循环利用咨询设计有限公司 | Integrated technology and system for urban sludge heat dehydration, waste heat drying and fluidized incineration |
| CN105318337A (en) * | 2015-10-20 | 2016-02-10 | 上海理工大学 | Coal-sludge co-combustion system based on high-temperature smoke drying and circulating fluidized bed boiler |
| CN106224997A (en) * | 2016-09-30 | 2016-12-14 | 上海垒锦环境科技中心 | The Combined type pulverizing system generated electricity for coal and mud coupling combustion |
| CN107572740A (en) * | 2017-09-26 | 2018-01-12 | 江苏中圣高科技产业有限公司 | A kind of sludge at low temperature desiccation burning integral method and system using fume afterheat |
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2020
- 2020-10-14 CN CN202011097743.7A patent/CN112174483A/en active Pending
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113603332A (en) * | 2021-09-03 | 2021-11-05 | 西安热工研究院有限公司 | Device and method for treating sludge by using high-temperature flue gas |
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Application publication date: 20210105 |