CN108954277A - One kind is with ball mill pulverized coal preparation system and utilizes flue gas dewatered sludge coupled electricity-generation system - Google Patents
One kind is with ball mill pulverized coal preparation system and utilizes flue gas dewatered sludge coupled electricity-generation system Download PDFInfo
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- CN108954277A CN108954277A CN201810886528.1A CN201810886528A CN108954277A CN 108954277 A CN108954277 A CN 108954277A CN 201810886528 A CN201810886528 A CN 201810886528A CN 108954277 A CN108954277 A CN 108954277A
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- sludge
- flue gas
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- drying
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- 239000010802 sludge Substances 0.000 title claims abstract description 98
- 239000003245 coal Substances 0.000 title claims abstract description 39
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000003546 flue gas Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000010865 sewage Substances 0.000 claims abstract description 9
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 7
- 231100000719 pollutant Toxicity 0.000 claims abstract description 7
- 238000010248 power generation Methods 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 16
- 238000000498 ball milling Methods 0.000 claims description 13
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 4
- 239000010801 sewage sludge Substances 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 244000052616 bacterial pathogen Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Food Science & Technology (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses one kind with ball mill pulverized coal preparation system and to utilize flue gas dewatered sludge coupled electricity-generation system, including drying machine, dewatered sludge warehouse and boiler etc.；Wherein, drying machine for the dewatered high moisture sluge of sewage treatment plant is dehydrated, desiccation, the outlet of drying machine is connected to the entrance of dewatered sludge warehouse, the outlet of dewatered sludge warehouse and the outlet of coal bunker are connected to the position of addition steel ball at the top of low speed coal mill, the outlet of low speed coal mill is connected to boiler furnace, desiccation heat source needed for the high-temperature flue gas at position is used to provide to drying machine between boiler economizer and air preheater.The present invention enters sludge drier by extracting high temperature flue-gas from boiler, dewatered sludge, reduction moisture percentage in sewage sludge in drying machine, sludge after drying be sent directly into powder processed in low speed coal mill, it is dry after flue gas be sent directly into boiler furnace burning, solve the problems, such as the pollutant process discharged in mud drying process while realizing sludge drying coupled electricity-generation.
Description
Technical Field
The invention belongs to the technical field of high-moisture sludge drying coupling power generation, and particularly relates to a steel-equipped ball milling powder making system and a flue gas drying sludge coupling power generation system.
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 steel-mixing ball milling powder making system and a power generation system coupled by using flue gas drying sludge, aiming at a thermal power generating unit of the steel-mixing ball milling powder making system, wherein the high-temperature flue gas of a boiler is extracted and enters a sludge dryer, the sludge is dried in the dryer, the water content of the sludge is reduced, the dried sludge is directly sent into a steel ball coal mill to be made into powder, and the dried flue gas is directly sent into a boiler hearth to be combusted, so that the sludge drying coupled power generation is realized, and the problem of pollutant treatment released in the sludge drying process is solved. The system is simple and efficient, and is easy to integrate with a thermal power generating unit.
The invention is realized by adopting the following technical scheme:
a steel-matching ball-milling pulverizing system and a flue gas drying sludge coupling power generation system comprise a dryer, a dried sludge storage bin, a steel ball coal mill, a coal bin, a boiler and an air preheater; wherein,
the dryer is used for dehydrating and drying high-moisture sludge dehydrated by a sewage treatment plant, an outlet of the dryer is connected to an inlet of the dried sludge storage bin, an outlet of the dried sludge storage bin and an outlet of the coal bin are both connected to a position where a steel ball is added at the top of the steel ball coal mill, an outlet of the steel ball coal mill is connected to a boiler furnace, and high-temperature flue gas at a position between the boiler economizer and the air preheater is used for providing a required drying heat source for the dryer.
The invention is further improved in that the sludge drying device further comprises a sludge feeding screw which is used for quantitatively feeding the high-moisture sludge into the drying machine.
The invention has the further improvement that the invention also comprises a cyclone separator which is used for separating the dried sludge along with the dry flue gas, and separated particles are stored in a dried sludge storage bin.
The invention has the further improvement that in the working process, high-moisture sludge dehydrated by a sewage treatment plant is quantitatively fed into a dryer, the high-moisture sludge is dehydrated and dried in the dryer, the dried sludge enters a cyclone separator along with dry flue gas, separated particles are stored in a dried sludge storage bin, then are conveyed to a position where steel balls are added at the top of a steel ball coal mill through a fully-closed belt, and the dried sludge at the position directly enters the steel ball coal mill and a coal bunker of a power plant for coal mixing and grinding and then enters a boiler hearth for combustion; the drying heat source required by the dryer is taken from high-temperature flue gas between a boiler economizer and an air preheater, the dried waste flue gas is dedusted by a cyclone separator, is used as tertiary air and is sent to a position between secondary air and over-fire air of a boiler hearth for direct combustion, and is sent to a chimney to reach the standard for emission after passing through original pollutant removal equipment of the boiler.
The invention has the following beneficial technical effects:
compared with the original boiler system, the method has the advantages that high-temperature flue gas is extracted to dry sludge, the dried flue gas is fed into the boiler hearth again, and as 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 the combustion of the boiler and the heat absorption of each heated surface, and basically has no influence on the safe and stable operation of a unit. Waste gas generated in the sludge drying process, such as H2S, NH3, mercaptan, organic sulfide, ammonia and other trace organic component gases, and the extracted flue gas are directly sent into a boiler furnace for secondary combustion, so that secondary pollution caused by drying waste is avoided. The dried sludge is directly conveyed to the position of the top of the steel ball coal mill where steel balls are added through a fully-closed belt, and the dried sludge is conveyed into the coal mill at the position, so that the release of foul gas emitted by the dried sludge can be effectively avoided, and the field working environment is effectively improved.
The steel ball milling powder making system and the flue gas drying sludge coupling power generation system provided by the invention can effectively utilize the high-temperature flue gas heat of the boiler to dry high-moisture sludge, the dried sludge is directly sent into the steel ball coal mill to be made into powder, the harmless treatment of the sludge is realized, the system has good adaptability with a unit system, the safe and stable operation of the original system is not influenced, and the dried waste flue gas is directly sent into a boiler furnace as tertiary air to be combusted for the second time, so that the secondary pollution of sludge drying is avoided. The invention can provide a new way for harmless incineration treatment of high-moisture sludge, and has remarkable social and environmental benefits.
Drawings
FIG. 1 is a schematic diagram of a power generation system coupled with a steel ball milling powder system and utilizing flue gas drying sludge.
In the figure: 1-a dryer, 2-a dried sludge storage bin, 3-a steel ball coal mill, 4-a coal bin, 5-a boiler and 6-an air preheater.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the steel ball milling powder preparation system and the sludge coupling power generation system using flue gas drying provided by the invention comprise a dryer 1, a dried sludge storage bin 2, a steel ball mill 3, a coal bin 4, a boiler 5 and an air preheater 6; the drying machine 1 is used for dehydrating and drying high-moisture sludge dehydrated by a sewage treatment plant and fed by the sludge feeding spiral in a quantitative mode, an outlet of the drying machine 1 is connected to an inlet of a dried sludge storage bin 2, an outlet of the dried sludge storage bin 2 and an outlet of a coal bin 4 are connected to the position of a steel ball mill 3, steel balls are added to the top of the steel ball mill 3, an outlet of the steel ball mill 3 is connected to a hearth of a boiler 5, and high-temperature flue gas between a boiler economizer and an air preheater 6 is used for providing a required drying heat source for the drying machine 1.
The principle diagram of the invention is shown in fig. 1, and the key technology is as follows:
high-moisture sludge dehydrated by a sewage treatment plant is quantitatively conveyed into a dryer 1 through a sludge feeding screw, the high-moisture sludge is dehydrated and dried in the dryer 1, the dried sludge enters a cyclone separator along with dry flue gas, separated particles are stored in a dried sludge storage bin 2, then the dried sludge is conveyed to a position where steel balls are added at the top of a steel ball coal mill 3 through a fully-closed belt, and the dried sludge at the position directly enters the steel ball coal mill 3 and a coal bunker 4 of a power plant to be mixed and ground, and then enters a hearth of a boiler 5 for combustion; the drying heat source required by the dryer 1 is taken from high-temperature flue gas between a boiler economizer and an air preheater 6, the dried waste flue gas is dedusted by a cyclone separator, and is used as tertiary air to be sent to a position between secondary air and over-fire air of a hearth of the boiler 5 for direct combustion, and the tertiary air is sent to a chimney to reach the standard and is discharged after passing through original pollutant removal equipment of the boiler 5.
The technical points protected by the invention are as follows:
1. the invention aims at a thermal power generating unit of a steel ball milling powder making system;
2. the invention adopts the high-temperature flue gas between the boiler economizer and the air preheater as a drying heat source;
3. after being dried, the sludge is conveyed to a position where steel balls are added at the top of a steel ball coal mill through a fully-closed belt, and the dried sludge at the position directly enters the steel ball coal mill and a coal bunker of a power plant to carry out coal blending and powder preparation;
4. the waste flue gas after sludge drying is dedusted by a cyclone separator and is sent to the position between secondary air and over-fire air of a boiler hearth through a pipeline to be directly combusted as tertiary air.
Claims (4)
1. A steel ball milling powder preparation system and a sludge coupling power generation system dried by using flue gas are characterized by comprising a dryer (1), a dried sludge storage bin (2), a steel ball coal mill (3), a coal bin (4), a boiler (5) and an air preheater (6); wherein,
the dryer (1) is used for dehydrating and drying high-moisture sludge dehydrated by a sewage treatment plant, an outlet of the dryer (1) is connected to an inlet of the dried sludge storage bin (2), an outlet of the dried sludge storage bin (2) and an outlet of the coal bin (4) are connected to a position where a steel ball is added at the top of the steel ball coal mill (3), an outlet of the steel ball coal mill (3) is connected to a hearth of a boiler (5), and high-temperature flue gas at a position between a boiler economizer and an air preheater (6) is used for providing a required drying heat source for the dryer (1).
2. The steel-matching ball-milling powder-making system and sludge coupling power generation system using flue gas drying as claimed in claim 1, further comprising a sludge feeding screw for quantitatively feeding high-moisture sludge into the dryer (1).
3. The steel-matching ball-milling powder making system and the sludge coupling power generation system using smoke drying as claimed in claim 1, further comprising a cyclone separator for separating dried sludge with dry smoke, and the separated particles are stored in a dried sludge storage bin (2).
4. The steel-mixing ball-milling powder-making system and the power generation system coupled by using the flue gas dried sludge as claimed in claim 3, wherein in operation, high-moisture sludge dehydrated by a sewage treatment plant is quantitatively fed into the dryer (1), the high-moisture sludge is dehydrated and dried in the dryer (1), the dried sludge enters the cyclone separator along with the dried flue gas, separated particles are stored in the dried sludge storage bin (2), and then are conveyed to the position of adding steel balls at the top of the steel ball coal mill (3) through a fully-closed belt, and the dried sludge directly enters the steel ball coal mill (3) and the coal bunker (4) of the power plant for coal mixing and grinding and then enters the hearth of the boiler (5) for combustion; the drying heat source required by the dryer (1) is taken from high-temperature flue gas between a boiler economizer and an air preheater (6), the dried waste flue gas is dedusted by a cyclone separator, and is used as tertiary air to be sent to a furnace hearth of the boiler (5) for direct combustion at a position between secondary air and over-fire air, and the tertiary air is sent to a chimney to reach the standard for emission after passing through original pollutant removal equipment of the boiler (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810886528.1A CN108954277A (en) | 2018-08-06 | 2018-08-06 | One kind is with ball mill pulverized coal preparation system and utilizes flue gas dewatered sludge coupled electricity-generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810886528.1A CN108954277A (en) | 2018-08-06 | 2018-08-06 | One kind is with ball mill pulverized coal preparation system and utilizes flue gas dewatered sludge coupled electricity-generation system |
Publications (1)
| Publication Number | Publication Date |
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| CN108954277A true CN108954277A (en) | 2018-12-07 |
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| CN201810886528.1A Pending CN108954277A (en) | 2018-08-06 | 2018-08-06 | One kind is with ball mill pulverized coal preparation system and utilizes flue gas dewatered sludge coupled electricity-generation system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631044A (en) * | 2018-12-19 | 2019-04-16 | 曲靖云能投新能源发电有限公司 | A kind of refuse incinerator of circulating fluid bed and its incinerating method |
| CN111320352A (en) * | 2020-03-19 | 2020-06-23 | 中国能源建设集团广东省电力设计研究院有限公司 | Sludge treatment equipment |
| CN111365728A (en) * | 2020-04-13 | 2020-07-03 | 华能国际电力股份有限公司 | Garbage and biomass coupling power generation system and method |
| CN112174483A (en) * | 2020-10-14 | 2021-01-05 | 华能国际电力股份有限公司 | Thermal power generating unit sludge coupling power generation system utilizing flue gas drying |
| CN112178671A (en) * | 2020-09-30 | 2021-01-05 | 西安热工研究院有限公司 | Method and system suitable for increasing direct blending combustion proportion of wet coal slime for pulverized coal fired boiler |
| CN112197278A (en) * | 2020-10-28 | 2021-01-08 | 西安热工研究院有限公司 | System for coupling sludge drying incineration of secondary reheating power station boiler |
| CN112984529A (en) * | 2021-04-09 | 2021-06-18 | 西安热工研究院有限公司 | Mix powder process system who burns mud |
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| CN207659297U (en) * | 2017-11-08 | 2018-07-27 | 上海锅炉厂有限公司 | Sludge drying couples coal generating system |
| CN208687698U (en) * | 2018-08-06 | 2019-04-02 | 西安热工研究院有限公司 | One kind is with ball mill pulverized coal preparation system and utilizes flue gas dewatered sludge coupled electricity-generation system |
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| CN106439892A (en) * | 2016-09-30 | 2017-02-22 | 上海垒锦环境科技中心 | Mixed powder preparation system with coal and sludge coupling combustion power generation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631044A (en) * | 2018-12-19 | 2019-04-16 | 曲靖云能投新能源发电有限公司 | A kind of refuse incinerator of circulating fluid bed and its incinerating method |
| CN111320352A (en) * | 2020-03-19 | 2020-06-23 | 中国能源建设集团广东省电力设计研究院有限公司 | Sludge treatment equipment |
| CN111320352B (en) * | 2020-03-19 | 2022-05-17 | 中国能源建设集团广东省电力设计研究院有限公司 | Sludge treatment equipment |
| CN111365728A (en) * | 2020-04-13 | 2020-07-03 | 华能国际电力股份有限公司 | Garbage and biomass coupling power generation system and method |
| CN112178671A (en) * | 2020-09-30 | 2021-01-05 | 西安热工研究院有限公司 | Method and system suitable for increasing direct blending combustion proportion of wet coal slime for pulverized coal fired boiler |
| CN112174483A (en) * | 2020-10-14 | 2021-01-05 | 华能国际电力股份有限公司 | Thermal power generating unit sludge coupling power generation system utilizing flue gas drying |
| CN112197278A (en) * | 2020-10-28 | 2021-01-08 | 西安热工研究院有限公司 | System for coupling sludge drying incineration of secondary reheating power station boiler |
| CN112984529A (en) * | 2021-04-09 | 2021-06-18 | 西安热工研究院有限公司 | Mix powder process system who burns mud |
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Application publication date: 20181207 |
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