CN110701608A - Fluidized bed boiler fuel and coal slime conveying system - Google Patents
Fluidized bed boiler fuel and coal slime conveying system Download PDFInfo
- Publication number
- CN110701608A CN110701608A CN201910173805.9A CN201910173805A CN110701608A CN 110701608 A CN110701608 A CN 110701608A CN 201910173805 A CN201910173805 A CN 201910173805A CN 110701608 A CN110701608 A CN 110701608A
- Authority
- CN
- China
- Prior art keywords
- coal slime
- coal
- fluidized bed
- bed boiler
- slime
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/50—Blending
- F23K2201/501—Blending with other fuels or combustible waste
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2203/00—Feeding arrangements
- F23K2203/20—Feeding/conveying devices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention provides a fluidized bed boiler fuel, which comprises coal and coal slime, wherein the coal slime accounts for more than 30%. The fluidized bed boiler coal slime conveying system comprises at least two coal slime loaders, a scraper, a coal slime kneading machine, a stirring buffer bin, a pre-pressing screw, an MBS II coal slime pump, a coal slime conveying pipeline, a furnace top connector and a boiler. According to the invention, the structure of the coal slime conveying system is optimized, so that the coal slime mixing combustion ratio is increased from 30% to 80%, the fuel cost is greatly reduced, and a large profit margin is brought to enterprises. The confidence of the staff is enhanced, the cohesion and the centripetal force of the enterprise are enhanced, and the development competitiveness of the enterprise is improved. The planned power generation amount of the company is calculated by 6500 ten thousand degrees per year, and the fuel cost is saved by 1004.9 ten thousand yuan per year.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a fluidized bed boiler fuel proportioning and coal slime conveying system.
Background
The circulating fluidized bed boiler adopts the clean coal combustion technology with the highest industrialization degree. The circulating fluidized bed boiler adopts fluidized combustion, the biggest difference between the circulating fluidized bed boiler and the bubbling fluidized bed combustion technology is that the running wind speed is high, the heterogeneous reaction processes such as combustion, desulfurization and the like are strengthened, the boiler capacity can be expanded to a large capacity (600 MW or above grade) acceptable by the power industry, the circulating fluidized bed boiler well solves the basic problems such as thermology, mechanics, materials and the like and the engineering problems such as expansion, abrasion, over temperature and the like, and becomes an advanced technology for energy utilization of difficult-to-combust solid fuels (such as coal gangue, oil shale, municipal refuse, silt and other wastes).
The circulating fluidized bed boiler adopts a circulating combustion system consisting of a combustion chamber, a hearth, a cyclone separator and a material returning device. The fuel consists of 70% of coal (about 4000 kcal of calorific value) and 30% of coal slurry. Coal is conveyed to a hearth by a coal feeder, coal slime enters a furnace top connector, and in the process of forming blocks and falling into the hearth, due to rapid heating, the outer surface of the coal slime block is dried and solidified, external water of the internal coal slime of the coal slime block is quickly vaporized to generate explosion, the block coal slime is exploded into a crushed shape, and the coal slime is completely and fully combusted. The ash-containing flue gas is separated by the cyclone separator, and most of the ash-containing flue gas is returned to the hearth by the material returning device for circulating and reburning.
Coal slime conveying system work flow: the coal slime loader → the scraper → the coal slime mixing machine → the stirring buffer bin → the pre-pressing spiral → the MBS II coal slime pump → the coal slime conveying pipeline → the furnace top connector → the coal slime enters the combustion chamber of the boiler for combustion.
In the boiler fuel, the coal accounts for 70 percent, the coal slime accounts for 30 percent and the fuel cost is high. However, if the coal slime proportion is increased to more than 30%, the following two problems occur:
the first problem is that: after the coal slime mixing combustion ratio is more than 30%, the return material fluctuation is large or the return material is interrupted intermittently, so that the combustion condition of the boiler is deteriorated, the steam temperature and the steam pressure are gradually reduced, and the load of the boiler is difficult to maintain. The second problem is that: after the coal slime is subjected to the mixed combustion with the ratio of more than 30%, the coal slime conveying system is blocked, the conveying pipeline vibrates greatly, and the coal slime conveying is interrupted occasionally, so that the actual conveying capacity of the coal slime system cannot meet the mixed combustion requirement.
Cause of problem one: after the coal slime combustion ratio is more than 30%, the return material fluctuation is large or the return material is interrupted, and two reasons mainly exist, namely, coking is generated in the return material device. Secondly, the material returning device is partially blocked.
Possible causes of coking in the material returning device are as follows:
1. the structural design of the furnace top connector is unreasonable, the coal slime enters the furnace top connector to form large blocks which cannot be completely and fully combusted in the short process of falling into a hearth, so that the carbon content of the returned material is too high, and the returned material is secondarily combusted in the returning device to cause coking of the returning device.
2. The coal slime concentration adjustment is unreasonable, the coal slime is too thin, the moisture is too big, and the transient process that falls into furnace can't separate out, can't burst completely, influences bed material fluidization quality, causes incomplete combustion, leads to the returning charge carbon content too high, and secondary combustion in the returning charge ware causes the returning charge ware coking. Too thin water content is too large, and the furnace fire is easy to extinguish.
3. The flanges at the bottom of the material returning device such as the access hole, the observation hole and the like leak air, and cold air leaks into the flange, so that the inner part of the material returning device is easily coked.
4. The bed temperature is unreasonable in fixed value and too low (lower than the ash deformation temperature), coking may occur in the material returning device.
5. The negative pressure fixed value range of the hearth is unreasonable, the negative pressure fixed value is overlarge, and returned materials are easily carried out of the hearth by smoke, so that the returned materials are large in fluctuation or interrupted.
(II) reasons for partial blockage of material returning device
1. The castable in the material returning device falls off;
2. the blast cap of the material returning device is blocked or damaged, the air quantity of the returned material is insufficient, the returned material cannot normally return to the hearth, and a large amount of the material is accumulated to block the hearth;
3. the fixed values of the returned material air quantity and the air pressure are unreasonable and are too small, so that the returned material cannot normally return to a hearth and is accumulated in a large amount to be blocked.
The cause of the second problem: the coal slime conveying system has the jam during, pipeline vibration is big and has the interruption during the transport, leads to the coal slime system actual delivery capacity can not satisfy the needs of mixing burning, the leading cause:
1. the equipment structure of the coal slime conveying system is unreasonable.
2. How to select the optimal concentration of the coal slime, namely, according to which parameter water is mixed, the coal slime is not too thin and is not too thick. The coal slurry feeder can not only ensure that the conveying system equipment does not vibrate and block, meet the blending combustion requirement, but also ensure that the coal slurry is completely and fully combusted in the furnace.
3. Only one coal slurry loader is aged, and due to high-load and high-frequency operation, faults are easy to occur, so that coal slurry conveying is interrupted.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fuel proportioning and system of a fluidized bed boiler.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the fluidized bed boiler fuel comprises coal and coal slime, wherein the coal slime accounts for more than 30%.
The utility model provides a fluidized bed boiler coal slime conveying system, includes coal slime loader, scrapes trigger, coal slime kneading machine, stirring surge bin, pre-compaction spiral, MBS II coal slime pump, coal slime pipeline, furnace roof connector, boiler, the coal slime loader be two at least.
The diameter of the coal slime conveying pipeline is 133 cm.
The aperture of a blanking sieve plate of the stirring buffer bin is 17cm x 10 cm.
The coal slime chain plate machine is connected between the coal slime kneading machine and the stirring buffer bin, and a discharging chute is arranged at a machine head discharging opening of the coal slime chain plate machine.
The coal slime conveying pipeline is provided with a shock absorption fixing frame at a certain distance.
And a water spraying pipe is arranged at the feed opening of the chain plate machine.
A clean water pipeline is connected between the chemical water and the coal slime clean water tank, and an electromagnetic valve is installed on the clean water pipeline.
The invention has the beneficial effects that: according to the invention, the structure of the coal slime conveying system is optimized, so that the coal slime mixing combustion ratio is increased from 30% to 80%, the fuel cost is greatly reduced, and a large profit margin is brought to enterprises. The confidence of the staff is enhanced, the cohesion and the centripetal force of the enterprise are enhanced, and the development competitiveness of the enterprise is improved. The planned power generation amount of the company is calculated by 6500 ten thousand degrees per year, and the fuel cost is saved by 1004.9 ten thousand yuan per year.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention increases the total number of the coal slime loaders to 2, realizes a one-use one-standby operation mode and ensures the continuity of coal slime delivery. And adjusting the optimized operation mode, testing and adjusting related operation control parameters of the coal slurry conveying system and the boiler combustion, and determining scientific, reasonable and optimal operation control parameters and combustion adjustment modes.
Coal slime conveying system equipment technical transformation condition:
1. and (3) modifying a coal slime conveying pipeline, namely changing an original Ø 120cm rubber lining pipe into a Ø 133cm high-pressure pipe, so that the rubber lining is prevented from falling off to block the pipeline, and simultaneously vibration is caused, and the conveying capacity cannot meet the requirement of blending combustion.
2. Coal slime stirring storehouse unloading sieve transformation: the aperture of the original sieve plate is changed from 10cm to 17cm to 15cm, so that the inlet of the coal slurry pump is prevented from being blocked.
3. The stirrer blades of the coal slime stirring bin are lengthened, so that the coal slime is uniformly stirred (the original stirring teeth are short, and the coal slime is not uniformly stirred).
4. The coal slime chain trigger aircraft nose feed opening installs the unloading chute additional, ensures that the unloading is smooth and easy, prevents that the clout from piling up the jam.
5. The machine tail feed opening of the coal slime chain plate machine is reformed, the large blockage of the coal slime is prevented, and the uniform material feeding is ensured.
6. The coal slime pipeline installs the shock attenuation mount, prevents vibration.
7. A water spraying pipe (Ø 6 mm) is additionally arranged at the feed opening of the chain plate machine, so that the feed opening is prevented from being blocked.
8. A clean water pipeline is additionally arranged from the water dissolving tank to the coal slime clean water tank, and an electromagnetic valve is additionally arranged on the clean water pipeline, so that the coal slime water mixing amount is effectively controlled.
9. A clean water pipe (Ø 50 mm) is additionally arranged on the coal slime chain plate machine, so that the water doping amount can meet the requirement and the feeding is smooth.
10. A high water level overflow pipe is additionally arranged at the upper opening of the coal slime stirring bin, so that the water doping amount meets the requirement.
11. The coal slime pump switch is changed into two sets of control, so that the pump operation is more stable and reliable.
12. The scraper conveyor is provided with a frequency converter, frequency conversion control is changed, and the conveying capacity is timely controlled to meet the blending combustion requirement (the original rotating speed is too fast and cannot be controlled).
13. A monitoring device is additionally arranged in the coal slime workshop, and a monitoring means is provided for operating the device.
14. The coal slime stirring bin lower port screw conveyer is provided with an observation hole, so that the trouble shooting is convenient.
15. And a splitter plate is arranged in a coal slime feed opening of the furnace top connector. After the coal slime enters the feed opening of the connector at the top of the furnace, the original one coal slime is separated into two coal slime blocks, and the formed blocks are reduced by one time, so that the aims of completely and fully burning the coal slime in the furnace and preventing the return feeder from coking are fulfilled.
Through the technical transformation and the realization of the one-use one-standby operation mode of the coal slime loader, the equipment performance of the coal slime conveying system is effectively improved, a reliable foundation is provided for solving the problems that the coal slime conveying system is blocked, the conveying pipeline vibrates greatly and the coal slime conveying is interrupted occasionally, so that the conveying capacity of the coal slime system cannot meet the mixed combustion requirement, and necessary conditions are provided for completely and fully combusting the coal slime in the furnace.
Adjusting an optimized operation mode, determining an optimal operation control parameter and a combustion adjustment mode:
the method is characterized in that the related operation control parameters of the coal slurry conveying system and the boiler combustion are tested and adjusted, and scientific, reasonable and optimal operation control parameters and combustion adjustment modes are determined. So as to solve the problem of large return material fluctuation or intermittent interruption of the return material.
Through repeated tests, the best operation and combustion adjustment mode of our company is found out: feeding point of coal slime combustion, coal slime optimal concentration control, hearth temperature control, hearth negative pressure control and material returning air volume control (air pressure).
Coal slime feeding working condition points: the boiler combustion condition is stable, when the temperature of the smoke at the outlet of the hearth is more than 750 ℃, the coal slime feeding can be carried out, the coal slime feeding amount is gradually increased along with the increase of the unit load, the unit load reaches more than 2/3 rated load (8 MW), and the coal slime mixed combustion proportion can be improved to more than 80%.
Controlling the optimal concentration of coal slime: when the pumping pressure is in the range of 6-8 MPa, the coal slime concentration is optimal, the coal slime is not too thin and thick, the conveying system equipment is not vibrated and blocked, the blending combustion requirement is met, the coal slime can be completely and fully combusted in the furnace, and the coking in a material returning device is prevented. Meanwhile, the lowest alarm value of the measurement cannot be less than 5 MPa.
Controlling the temperature of the hearth: the optimal hearth temperature control range is 850-950 ℃, and over high temperature, coking is easy to occur, and over low temperature, fire is easy to extinguish.
And (3) controlling negative pressure of the hearth: the optimal control range is between 0 and-50 Pa. The normal returning charge can be ensured, and the coal slime particles can not be carried out of the furnace chamber by the flue gas and are combusted in the tail flue of the boiler.
And (3) controlling the wind pressure of the return wind: the optimum control range is 12KPa to 14 KPa. Can ensure normal return material and does not influence fluidized combustion.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, and that various modifications and alterations can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a fluidized bed boiler fuel, includes coal and coal slime, its characterized in that: the coal slime accounts for more than 30%.
2. The utility model provides a fluidized bed boiler coal slime conveying system, includes the coal slime loader, scrapes trigger, coal slime rub with hands machine, stirring surge bin, pre-compaction spiral, MBS II coal slime pump, coal slime pipeline, furnace roof mouth-piece, boiler, its characterized in that: the number of the coal slime loaders is at least two.
3. The system of claim 2, wherein: the diameter of the coal slime conveying pipeline is 133 cm.
4. The system of claim 2, wherein: the aperture of a blanking sieve plate of the stirring buffer bin is 17cm x 10 cm.
5. The system of claim 2, wherein: the coal slime chain plate machine is connected between the coal slime kneading machine and the stirring buffer bin, and a discharging chute is arranged at a machine head discharging opening of the coal slime chain plate machine.
6. The system of claim 2, wherein: the coal slime conveying pipeline is provided with a shock absorption fixing frame at a certain distance.
7. The system of claim 5, wherein: and a water spraying pipe is arranged at the feed opening of the chain plate machine.
8. The system of claim 2, wherein: a clean water pipeline is connected between the chemical water and the coal slime clean water tank, and an electromagnetic valve is installed on the clean water pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910173805.9A CN110701608A (en) | 2019-03-08 | 2019-03-08 | Fluidized bed boiler fuel and coal slime conveying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910173805.9A CN110701608A (en) | 2019-03-08 | 2019-03-08 | Fluidized bed boiler fuel and coal slime conveying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110701608A true CN110701608A (en) | 2020-01-17 |
Family
ID=69193101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910173805.9A Pending CN110701608A (en) | 2019-03-08 | 2019-03-08 | Fluidized bed boiler fuel and coal slime conveying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110701608A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871651A (en) * | 2010-06-29 | 2010-10-27 | 北京中矿环保科技股份有限公司 | Method and device for cleanly storing and feeding coal slurry fuel of electric power plant |
| CN201944868U (en) * | 2010-11-12 | 2011-08-24 | 北京中矿环保科技股份有限公司 | Double-helical coal mud feeder |
| CN102330973A (en) * | 2011-10-13 | 2012-01-25 | 邹城市圣瑞达能源有限公司 | Blending gas-solid mixed fuel technology of CFB (circulating fluid bed) boiler |
| CN106642185A (en) * | 2016-11-14 | 2017-05-10 | 北京中矿环保科技股份有限公司 | Process and system for mixed burning of coal slime in big proportion in coal-powder boiler |
| CN108479125A (en) * | 2018-05-31 | 2018-09-04 | 淮北矿业股份有限公司 | One kind being used for underground coal mine tank coal mud clearing device |
| CN208082675U (en) * | 2018-03-09 | 2018-11-13 | 内蒙古蒙达钛业股份有限公司 | A kind of titanium ore filter plant |
| CN109297016A (en) * | 2018-10-10 | 2019-02-01 | 贵州新能源开发投资股份有限公司 | It is a kind of to mix the circulating fluidized bed boiler front water wall pipe structure for burning coal slime |
-
2019
- 2019-03-08 CN CN201910173805.9A patent/CN110701608A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871651A (en) * | 2010-06-29 | 2010-10-27 | 北京中矿环保科技股份有限公司 | Method and device for cleanly storing and feeding coal slurry fuel of electric power plant |
| CN201944868U (en) * | 2010-11-12 | 2011-08-24 | 北京中矿环保科技股份有限公司 | Double-helical coal mud feeder |
| CN102330973A (en) * | 2011-10-13 | 2012-01-25 | 邹城市圣瑞达能源有限公司 | Blending gas-solid mixed fuel technology of CFB (circulating fluid bed) boiler |
| CN106642185A (en) * | 2016-11-14 | 2017-05-10 | 北京中矿环保科技股份有限公司 | Process and system for mixed burning of coal slime in big proportion in coal-powder boiler |
| CN208082675U (en) * | 2018-03-09 | 2018-11-13 | 内蒙古蒙达钛业股份有限公司 | A kind of titanium ore filter plant |
| CN108479125A (en) * | 2018-05-31 | 2018-09-04 | 淮北矿业股份有限公司 | One kind being used for underground coal mine tank coal mud clearing device |
| CN109297016A (en) * | 2018-10-10 | 2019-02-01 | 贵州新能源开发投资股份有限公司 | It is a kind of to mix the circulating fluidized bed boiler front water wall pipe structure for burning coal slime |
Non-Patent Citations (1)
| Title |
|---|
| 何新宏: "大型循环流化床锅炉大比例掺烧煤泥研究", 《中国煤炭工业》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104832915B (en) | Method of blending combustion of fuel coal fly ash in biomass circulating fluidized bed boiler and a device thereof | |
| CN110107890B (en) | Method for preventing circulating fluidized bed boiler from coking | |
| CN102418920B (en) | Circulating fluidized bed power generating boiler capable of blended combustion of industrial waste residues | |
| CN112675691A (en) | Flue gas semi-dry desulfurization system and desulfurization method | |
| CN112032725A (en) | Ultrahigh-temperature thermal cyclone type household garbage treatment equipment and treatment method thereof | |
| CN110701608A (en) | Fluidized bed boiler fuel and coal slime conveying system | |
| CN116123558A (en) | Direct-fired utilization system of quality-improving gasification fine slag pulverized coal furnace and operation method thereof | |
| CN206786708U (en) | A kind of CFBB dilute phase coal dust co-combustion system | |
| CN202392781U (en) | Power generating boiler of circulating fluidized bed for co-combustion of industrial waste residue | |
| CN201046951Y (en) | Oil shale refining furnace dry method decoking apparatus | |
| CN214881305U (en) | Low-calorific-value gas generating device for photovoltaic glass melting furnace | |
| CN100545236C (en) | Dry decoking process for shale oil extracting furnace | |
| CN212339254U (en) | Ultrahigh-temperature thermal cyclone type household garbage treatment equipment | |
| CN212370013U (en) | Sludge anti-blocking conveying system | |
| CN110553504B (en) | Method for drying semi-coke by taking calcium carbide furnace purified ash as fuel | |
| CN102654283B (en) | Cyclone combustion system for coal slag powder | |
| CN101144618A (en) | High temperature fluidized bed combustion process | |
| CN111102566A (en) | Clean power generation method by blending and burning coal slime in large circulating fluidized bed boiler | |
| CN111102564A (en) | Clean power generation method for mixed-burning coal slime based on bed temperature and bed pressure control | |
| CN111102565A (en) | Method for controlling emission of pollutants generated by mixed combustion of coal slime | |
| CN111102563A (en) | Clean power generation method by blending and burning coal slime based on low-position coal slime feeding mode | |
| CN218864157U (en) | Fly ash recycling device for replenishing fluidized bed boiler bed material | |
| CN217875824U (en) | Material layer and SO of circulating fluidized bed boiler 2 Monitoring and adjusting device for emission | |
| CN220541073U (en) | Metal foreign matter removing device in biomass fluidized bed boiler | |
| CN219494108U (en) | Material conveying device of fly ash fuel incineration boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200117 |
|
| WD01 | Invention patent application deemed withdrawn after publication |