CN105202549A - Coal-sludge multi-fuel combustion system based on two-medium flue gas drying and pneumatic transportation - Google Patents
Coal-sludge multi-fuel combustion system based on two-medium flue gas drying and pneumatic transportation Download PDFInfo
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- CN105202549A CN105202549A CN201510678657.8A CN201510678657A CN105202549A CN 105202549 A CN105202549 A CN 105202549A CN 201510678657 A CN201510678657 A CN 201510678657A CN 105202549 A CN105202549 A CN 105202549A
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Abstract
The invention relates to a coal-sludge multi-fuel combustion system based on two-medium flue gas drying and pneumatic transportation. A sludge storage cabin is connected with a spraying drying pipe; the spraying drying pipe is connected with a mixing chamber; one path of an inlet of the mixing chamber is connected with an outlet flue of a cyclone separator, and the other path is connected with an outlet of a dust remover through a cold smoke draught fan; a spraying drying pipe outlet I is connected with a rotary feeder I; a spraying drying pipe outlet II is connected with the cyclone separator; an exhausting hole of the cyclone separator is connected with a circulating fluidized bed boiler through a cooling condenser and an exhausting steam draught fan; an unloading hole of the cyclone separator is connected with a rotary feeder II; a limestone cabin is connected with a rotary feeder III; the rotary feeder I, the rotary feeder II and the rotary feeder III are connected with the circulating fluidized bed boiler through a spraying feeder; and a gas inlet of the spraying feeder is connected with a Roots draught fan. With the adoption of the coal-sludge multi-fuel combustion system, functions of sludge desiccation and transportation, residual heat utilization of dry tail gas, multi-fuel combustion of sludge and coal, control of pollutants and the like can be realized, and the diffusion of stench and dust is facilitated; and the system has the characteristics of simplicity, environmental friendliness and high efficiency.
Description
Technical field
The present invention relates to a kind of waste treatment system, particularly relate to a kind of sludge drying and with the system of coal multifuel combustion.
Background technology
Along with the generation of municipal sewage and treating capacity increasing, the mud produced in the processing procedure of municipal sewage also grows with each passing day.The flock that mud is made up of moisture, organic granular and inorganic particle etc., wherein containing plurality of heavy metal, pathogen and difficult degradation toxic organic compound, also can emitting offensive odor.Therefore, must deal carefully with mud.
The pretreatment of mud has the technology such as conditioning, concentrated, dehydration, stabilisation and mummification, the final disposal of mud mainly contains the modes such as landfill, Land_use change, construction material utilization, biological treatment and burning, and the emerging technologies such as pyrolysis, gasification and pyrohydrolysis are also among research and development.Because all many-sided requirements such as soil protection, ground water protection and food security improve constantly, the application of the conventional art such as landfill and Land_use change faces increasing restraining factors, burns and develops rapidly with other sludge treatment new technology.
According to the fuel that CIU uses, sludge incineration can be divided into burns separately and burns two classes with other fuel mix; According to whether carrying out drying and other treatment, sludge incineration is divided into directly burns and burns two classes after mummification; According to adopted incinerator, sludge incineration can be divided into grate furnace burning, fluidized combustion, melting furnace burning, rotary kiln incineration and station boiler to mix burning etc.
Because the dewatered sludge from sewage treatment plant generally also has comparatively high-moisture percentage, calorific value is very low, and when directly entering stove burning, need more auxiliary fuel, the ratio of burning mixed mud is lower, and treatment scale is little, and the flue gas loss of boiler is large, and the thermal efficiency declines.Burning reentering stove after dewatered sludge mummification, stability and the treatment scale of stove combustion can be improved.
Mummification-incineration technology extensively adopts power plant's low-pressure steam and other heat medium dewatered sludge higher to the moisture content from sewage treatment plant to heat, make moisture in mud evaporate further and obtain the dewatered sludge that moisture content is lower, calorific value is higher, then send in boiler through dewatered sludge feeding system and burn; Burn the high-temperature flue gas produced to discharge after heat recovery and purified treatment, thus realize reducing sludge volume, decrement and innoxious.
Sludge heat drying link has direct mummification, indirectly drying and associating mummification three kinds of typical process.Direct mummification is in operation, and thermal medium (hot-air, heat smoke or heat ash etc.) directly contacts with mud, and thermal medium low speed flows through sludge blanket, absorbs the moisture in mud in the process, and the dewatered sludge after process need be separated with thermal medium.A waste gas part of discharging to get back in original system use again by heat recovery system, and remaining part is discharged after innoxious.In indirectly drying process, thermal medium does not directly contact with mud, but transfers heat to mud by heat exchanger, and the moisture in mud is evaporated, and thermal medium is generally 160-200 DEG C of saturated steam or conduction oil.Condensation in addition in the moisture evaporated in drying sludge process to condenser, a part for thermal medium is got back in original system and is recycled, with economize energy.Directly-indirect associating mummification combines above-mentioned two kinds of technology.
In several conventional type of furnace of sludge incineration link, the process capacity of grate furnace, melting furnace and rotary kiln is all relatively little; The Fuel Consumption of large-scale fluidized bed boiler and pulverized-coal fired boiler is large, even if mix the mud of the lower ratio of burning, its mud handling capacity that can realize is still very large, and the mud mixing the lower ratio of burning can not have an impact to safe operation of the boiler, stove combustion is stablized, and temperature is high, pollutant complete decomposition, and these station boilers are often equipped with advanced flue gas purification system, the pollutant that it can bring sludge incineration carries out purified treatment.Visible, utilize station boiler to carry out cooperative disposal to mud and have a good application prospect.
In conjunction with different sludge dryings and burning mode, in the sludge drying of having gone into operation-burning engineering, just create steam mummification-fluidized combustion, steam mummification-pulverized-coal fired boiler mixes the different process route such as burning, flue gas mummification-rotary kiln incineration.Because most engineering undergoes technological transformation to the boiler controller system put into operation for many years, to increase sewage sludge storage, mummification and induction system, the needs of sludge incineration are not considered during initial design boiler controller system, so the sludge drying workshop set up generally adopts steam indirectly drying technique, distance between its position and boiler is usually far away, need the coal yard first dewatered sludge being transported to power plant to store up, then adopt Belt Conveying mode to send into pulverized coal preparation system, or directly send into burning in stove.This causes system flow complicated, and equipment is many, and floor space is large, and cost of investment is high; Again because the mud after mummification has airborne dust in stacking and course of conveying and foul smell distributes, and the sealing property of belt conveyor system is poor, so easily cause foul smell in plant area and near zone diffusion, cause work under bad environment, have a strong impact on the enthusiasm of power plant's burning sludge.At present, also the mud flue gas mummification-pulverized-coal fired boiler based on fanned powder-grinding system is had to mix firing technique scheme, but due to mud mummification the primary mixture produced in the process of grind into powder has stronger penetrating odor, corrosivity and very high dust concentration in fan mill, its gas powder is separated and acquires a certain degree of difficulty, requirement of explosion proof is also higher, there is not yet engineer applied.
Therefore for the needs of power plant's burning sludge, development system is succinct, flow process is short, the sludge anhydration burning electricity generation system of environment-friendly high-efficiency is necessary.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of coal-mud mixture burning control system based on two medium flue gas dryings and Geldart-D particle, this system Absorbable organic halogens ground carries out sludge drying, and the multifuel combustion of mud and coal after realizing mummification, effective control foul smell and dust recycling, overcome the deficiency in existing sludge incineration engineering.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of coal-mud mixture burning control system based on two medium flue gas dryings and Geldart-D particle, comprise warehouse of sludge, screw pump, spraying dry pipe, rotary feeder one, cyclone separator, rotary feeder two, roots blower, spray loader, cooler condenser, weary gas blower fan, CFBB, Limestone silo, rotary feeder three, mixing chamber, cold smoke blower fan, described warehouse of sludge discharging opening connects the charging aperture of spraying dry pipe by screw pump, the air inlet of spraying dry pipe is connected with the outlet of mixing chamber, the entrance of mixing chamber divides two-way, one tunnel is connected with the Cyclone outlet flue of CFBB, from the Cyclone outlet flue extracting high-temperature flue gas of CFBB, cold smoke blower fan of separately leading up to connects the outlet of deduster, cold flue gas is extracted from house outlet by cold smoke blower fan, mixing temperature adjustment is carried out in mixing chamber, mixed heat smoke is as drying sludge medium, the outlet one of described spraying dry pipe connects rotary feeder one, the bulky grain mud by heated drying of the bottom being deposited to drying tube is made to enter rotary feeder one, the outlet two of described spraying dry pipe connects cyclone separator, make all the other mud granules enter cyclone separator together with dried tail gas and carry out gas solid separation, the exhaust outlet of cyclone separator passes through cooler condenser successively, weary gas blower fan connects CFBB, make the high weary gas containing wetting after cooler condenser cool-down dehumidification, the dilute-phase zone burning of CFBB is entered by weary gas blower fan, the discharge port of described cyclone separator connects rotary feeder two, isolated mud granule is made to enter rotary feeder two, described Limestone silo is connected with rotary feeder three, makes the limestone particle in Limestone silo enter rotary feeder three, described rotary feeder one, rotary feeder two are connected with the charging aperture spraying loader with the outlet of rotary feeder three, the air inlet spraying loader is connected with roots blower, the outlet of spraying loader is connected with CFBB, make, from the dewatered sludge of rotary feeder one, rotary feeder two with after entering injection loader from the lime stone of rotary feeder three, to carry by the compressed air exported from roots blower the emulsion zone sending into CFBB and participate in burning.
Described CFBB charging aperture connects feeding-coal bucket by feeder, makes the coal in feeding-coal bucket send into the emulsion zone burning of CFBB through feeder; The outlet of described CFBB connects chimney by deduster, desulfurizer, air-introduced machine successively, each heating surface that the high-temperature flue gas that burning is produced flows through CFBB releases heat, after deduster removing dust, be divided into two-way, one tunnel is extracted by cold smoke blower fan, another road enters in desulfurizer, enters smoke stack emission after removing the SOx in flue gas further through air-introduced machine.
The invention has the beneficial effects as follows: adopt technique scheme, by carrying out direct contact drying to mud after extracting high-temperature flue gas and low-temperature flue gas mixing temperature adjustment, compared with the steam indirectly drying technology extensively adopted at present, speed and the treating capacity of drying sludge can be significantly improved, and the waste heat of dry weary gas is reclaimed by cooler condenser, reduce energy consumption for drying, reduce the moisture that mud brings boiler into, thus reduce boiler export flue gas dew point temperature and heat loss due to exhaust gas, improve boiler thermal output; Burning facility adopts CFBB, the average grain diameter general control of the coal particle and mud granule that enter stove burning is the level of several millimeters, without the need to adopting the equipment such as fan mill that mud is ground to micron-sized particle diameter, thus reduce the difficulty of spraying dry tube inlet mud granulation and gas solid separation thereafter; From cyclone separator of circulating fluidized bed boiler exhaust pass extracting high-temperature flue gas, with in fan mill drying system near Pulverized Coal fired Boiler Furnace outlet extracting high-temperature Gas phase Smoke ratio, greatly reduce high-temperature flue gas extraction to the impact of boiler heating surface Temperature Deviation and job security; The function of circulating fluid bed boiler desulfurization, denitration and dedusting can be given full play to, effectively control the pollutant emission that mud mixes burning; Adopt pneumatic conveying mode to carry out the conveying of dewatered sludge and lime stone, be conducive to the seal improving course of conveying, prevent foul smell and dust to be outwards leaked in environment, do not need to arrange dewatered sludge warehouse, improve the flexibility that front-furnace feeding device is arranged.
Therefore, the coal-mud mixture burning control system based on two medium flue gas dryings and CFBB that the present invention proposes, integrates sludge drying, burning and pollutant catabolic gene function, have system succinctly, the feature of environment-friendly high-efficiency.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, at the coal-mud mixture burning control system based on two medium flue gas dryings and CFBB of the present invention, comprise warehouse of sludge 1, screw pump 2, spraying dry pipe 3, rotary feeder 1, cyclone separator 5, rotary feeder 26, roots blower 7, spray loader 8, cooler condenser 9, weary gas blower fan 10, CFBB 11, feeding-coal bucket 12, feeder 13, Limestone silo 14, rotary feeder 3 15, mixing chamber 16, deduster 17, cold smoke blower fan 18, desulfurizer 19, air-introduced machine 20 and chimney 21.
The outlet of feeding-coal bucket 12 is connected with feeder 13, and the outlet of feeder 13 is connected with CFBB 11, and the outlet of CFBB 11 is connected successively with deduster 17, desulfurizer 19, air-introduced machine 20, chimney 21;
Warehouse of sludge 1 is connected to screw pump 2, the outlet of screw pump 2 is connected to the charging aperture of spraying dry pipe 3, the air inlet of spraying dry pipe 3 is connected with the outlet of mixing chamber 16, the entrance of mixing chamber 16 divides two-way, one tunnel is connected with the Cyclone outlet flue of CFBB 11, one tunnel is connected with the outlet of cold smoke blower fan 18, the entrance of cold smoke blower fan 18 is connected with the outlet of deduster 17, the outlet one of spraying dry pipe 3 is connected with rotary feeder 1, the outlet two of spraying dry pipe 3 is connected with cyclone separator 5, the discharge port of cyclone separator 5 is connected with rotary feeder 26, the exhaust outlet of cyclone separator 5 and cooler condenser 9, weary gas blower fan 10 connects successively, the outlet of weary gas blower fan 10 is connected to CFBB 11.
Limestone silo 14 is connected with rotary feeder 3 15, rotary feeder 1, rotary feeder 26 are connected with the charging aperture spraying loader 8 with the outlet of rotary feeder 3 15, the air inlet spraying loader 8 is connected with roots blower 7, and the outlet of spraying loader 8 is connected with CFBB 11.
Should be based on the operation principle of the coal-mud mixture burning control system of two medium flue gas dryings and CFBB:
From the Cyclone outlet flue extracting high-temperature flue gas of CFBB 11, export extraction cold flue gas by cold smoke blower fan 18 from deduster 17, in mixing chamber 16, carry out mixing temperature adjustment, mixed heat smoke is as drying sludge medium; Be stored in the mud in warehouse of sludge 1, spraying dry pipe 3 is transported to through screw pump 2, mix with the heat smoke from mixing chamber 16, and by heated drying, oarse-grained sludge settling is to the bottom of drying tube 3, enter rotary feeder 1, all the other mud granules enter cyclone separator 5 and carry out gas solid separation together with dried tail gas, the high weary gas containing wetting is after cooler condenser 9 cool-down dehumidification, entered the dilute-phase zone burning of CFBB 11 by weary gas blower fan 10, isolated mud granule enters rotary feeder 26; Limestone particle in Limestone silo 14 enters rotary feeder 3 15; From the dewatered sludge of rotary feeder 1, rotary feeder 26 with after entering injection loader 8 from the lime stone of rotary feeder 3 15, carry by the compressed air exported from roots blower 7 emulsion zone sending into CFBB 11 and participate in burning; Each heating surface that the high-temperature flue gas that burning produces flows through CFBB 11 releases heat, after deduster 17 removes dust, be divided into two-way, one tunnel is extracted by cold smoke blower fan 18, another road enters in desulfurizer 19, enters chimney 21 discharge after removing the SOx in flue gas further through air-introduced machine 20.
Native system has following characteristics:
(1) after extracting high-temperature flue gas and low-temperature flue gas mixing as the drier of mud, this two medium drying systems, by regulating the extraction ratio of high-temperature flue gas and low-temperature flue gas, can adapt to the needs of drying sludge Load Regulation; Greatly, mud conveying process is few, good leak tightness, and foul smell and dust can be prevented to be leaked in environment for mud and the direct contact drying speed of flue gas;
(2) burning facility adopts CFBB, compares with coal-powder boiler, and the average grain diameter entering the coal particle of stove burning and mud granule is comparatively large, reduces the difficulty of spraying dry tube inlet mud granulation and gas solid separation thereafter; From cyclone separator of circulating fluidized bed boiler exhaust pass extracting high-temperature flue gas, also reduce high-temperature flue gas and extract impact on boiler heating surface Temperature Deviation and job security;
(3) unit condensate water can be adopted as the cooling medium in cooler condenser, reclaim the waste gas residual heat after drying sludge, reduce energy consumption for drying, reduce the moisture that mud brings boiler into, thus reduce boiler export flue gas dew point temperature and heat loss due to exhaust gas, improve boiler thermal output.
(4) pneumatic conveying mode is adopted to carry out the conveying of dewatered sludge and lime stone, compare with helical feed with Belt Conveying, be conducive to the seal improving course of conveying, foul smell and dust is prevented outwards to be leaked in environment, do not need to arrange dewatered sludge warehouse, improve the flexibility that front-furnace feeding device is arranged.
Therefore, be somebody's turn to do the coal-mud mixture burning control system based on two medium flue gas dryings and CFBB, sludge drying can be realized and conveying, dried tail gas waste heat utilize, mud and the controlling functions such as coal multifuel combustion and pollutant, be conducive to preventing foul smell and dust recycling, having that system is succinct, the feature of environment-friendly high-efficiency, is a kind of novel sludge treatment system.
Claims (2)
1., based on coal-mud mixture burning control system of two medium flue gas dryings and Geldart-D particle, comprise warehouse of sludge (1), screw pump (2), spraying dry pipe (3), rotary feeder one (4), cyclone separator (5), rotary feeder two (6), roots blower (7), spray loader (8), cooler condenser (9), weary gas blower fan (10), CFBB (11), Limestone silo (14), rotary feeder three (15), mixing chamber (16), cold smoke blower fan (18), it is characterized in that: described warehouse of sludge (1) discharging opening connects the charging aperture of spraying dry pipe (3) by screw pump (2), the air inlet of spraying dry pipe (3) is connected with the outlet of mixing chamber (16), the entrance of mixing chamber (16) divides two-way, one tunnel is connected with the Cyclone outlet flue of CFBB (11), from the Cyclone outlet flue extracting high-temperature flue gas of CFBB (11), cold smoke blower fan (18) of separately leading up to connects the outlet of deduster (17), cold flue gas is extracted from deduster (17) outlet by cold smoke blower fan (18), in mixing chamber (16), carry out mixing temperature adjustment, mixed heat smoke is as drying sludge medium, the outlet one of described spraying dry pipe (3) connects rotary feeder one (4), the bulky grain mud by heated drying of the bottom being deposited to drying tube (3) is made to enter rotary feeder one (4), the outlet two of described spraying dry pipe (3) connects cyclone separator (5), make all the other mud granules enter cyclone separator (5) together with dried tail gas and carry out gas solid separation, the exhaust outlet of cyclone separator (5) is successively by cooler condenser (9), weary gas blower fan (10) connects CFBB (11), make the high weary gas containing wetting after cooler condenser (9) cool-down dehumidification, the dilute-phase zone burning of CFBB (11) is entered by weary gas blower fan (10), the discharge port of described cyclone separator (5) connects rotary feeder two (6), isolated mud granule is made to enter rotary feeder two (6), Limestone silo (14) is connected with rotary feeder three (15), makes the limestone particle in Limestone silo (14) enter rotary feeder three (15), described rotary feeder one (4), rotary feeder two (6) is connected with the charging aperture spraying loader (8) with the outlet of rotary feeder three (15), the air inlet spraying loader (8) is connected with roots blower (7), the outlet of spraying loader (8) is connected with CFBB (11), make from rotary feeder one (4), the dewatered sludge of rotary feeder two (6) and after entering spray loader (8) from the lime stone of rotary feeder three (15), carry by the compressed air exported from roots blower (7) emulsion zone sending into CFBB (11) and participate in burning.
2. coal-mud the mixture burning control system based on two medium flue gas dryings and Geldart-D particle according to claim 1, it is characterized in that: described CFBB (11) charging aperture connects feeding-coal bucket (12) by feeder (13), make the coal in feeding-coal bucket (12) send into the emulsion zone burning of CFBB (11) through feeder (13); The outlet of described CFBB (11) connects chimney (21) by deduster (17), desulfurizer (19), air-introduced machine (20) successively, each heating surface that the high-temperature flue gas that burning is produced flows through CFBB (11) releases heat, after deduster (17) removing dust, be divided into two-way, one tunnel is extracted by cold smoke blower fan (18), another road enters in desulfurizer (19), enters chimney (21) discharge after removing the SOx in flue gas further through air-introduced machine (20).
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| CN201510678657.8A CN105202549B (en) | 2015-10-20 | 2015-10-20 | Coal sludge mixture burning control system based on two medium flue gas dryings and Geldart-D particle |
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| CN201510678657.8A CN105202549B (en) | 2015-10-20 | 2015-10-20 | Coal sludge mixture burning control system based on two medium flue gas dryings and Geldart-D particle |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN107388263A (en) * | 2017-05-05 | 2017-11-24 | 江苏绿威环保科技有限公司 | A kind of sludge collaboration burning processing system and processing method |
| CN107970725A (en) * | 2017-12-05 | 2018-05-01 | 浙江千尧环境工程有限公司 | Flue gas recirculation system |
| CN111408230A (en) * | 2020-04-22 | 2020-07-14 | 华能国际电力股份有限公司 | Wastewater recoverable integrated treatment system and method suitable for coal-fired power plant |
| CN112178623A (en) * | 2020-08-27 | 2021-01-05 | 烟台清泉实业有限公司 | Generating set for large-proportion mixed combustion of dried sludge |
| CN112387108A (en) * | 2020-12-09 | 2021-02-23 | 北京京城环保股份有限公司 | Double-stage dry deacidification complete device and method for sludge incineration flue gas |
| CN112762461A (en) * | 2020-12-30 | 2021-05-07 | 上海市政工程设计研究总院（集团）有限公司 | Sludge incineration equipment |
| CN113105130A (en) * | 2021-04-19 | 2021-07-13 | 河南省新思源电力科学研究院有限公司 | Circulating fluidized bed boiler structure |
| CN115949949A (en) * | 2022-12-29 | 2023-04-11 | 广东广业投资集团有限公司 | System and method for household garbage collaborative drying incineration of sludge |
| CN117466516A (en) * | 2023-11-24 | 2024-01-30 | 河北长润环保科技有限公司 | Sludge drying coupling combustion system and process thereof |
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| CN111408230A (en) * | 2020-04-22 | 2020-07-14 | 华能国际电力股份有限公司 | Wastewater recoverable integrated treatment system and method suitable for coal-fired power plant |
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| CN112387108A (en) * | 2020-12-09 | 2021-02-23 | 北京京城环保股份有限公司 | Double-stage dry deacidification complete device and method for sludge incineration flue gas |
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| CN115949949B (en) * | 2022-12-29 | 2023-10-20 | 广东广业投资集团有限公司 | System and method for cooperatively drying and incinerating sludge by using household garbage |
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