CN201582808U - Prevention circulating fluidized bed boiler coking device - Google Patents
Prevention circulating fluidized bed boiler coking device Download PDFInfo
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- CN201582808U CN201582808U CN2009202696591U CN200920269659U CN201582808U CN 201582808 U CN201582808 U CN 201582808U CN 2009202696591 U CN2009202696591 U CN 2009202696591U CN 200920269659 U CN200920269659 U CN 200920269659U CN 201582808 U CN201582808 U CN 201582808U
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- steam
- boiler
- coking
- fluidized bed
- circulating fluidized
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Abstract
The utility model relates to a circulating fluidized bed boiler coking prevention device. The technical scheme of the device includes that a steam pipe is arranged on a primary air pipe between an air pre-heater and an air chamber of a circulating fluidized bed boiler, steam comes from middle steam pumping of a steam turbine or other over-heating steam, and an electric dish valve for adjusting steam is arranged on the steam pipe. When relevant parameters of boiler operation have big fluctuation, furnace fuel combustion conditions of a hearth can be changed, furnace material temperature and bed layer pressure drop exceed a range set by a controller, furnace fuel coking phenomena can be generated, in the moment, the electric dish valve on the steam pipe can be opened in time to add steam to the primary air pipe, the combustion temperature of furnace fuel of the hearth can be rapidly lowered through heat absorption of steam, heat absorption reaction of water steam decomposition of carbon in the steam and a high temperature burning zone and the like, and the prevention device can prevent or avoid coking phenomena of furnace fuel of the hearth in the operation process of the circulating fluidized bed boiler.
Description
Technical field
The utility model relates to a kind of measure that prevents circulating fluidized bed boiler coking, is used for CFBB, reduces the temperature of CFBB high temperature combustion zone, prevention or the coking of prevention fluidized-bed combustion boiler.
Background technology
The circulating fluidized bed boiler fuel wide adaptability, the energy burning inferior coal, have the efficiency of combustion height, discharged nitrous oxides is low, Load Regulation is fast, add advantages such as lime stone direct desulfurization, since the self-loopa fluidized bed combustion occurred, CFBB worldwide was widely used.
Practice shows, coking has become CFBB comparatively common phenomenon in service in the stove, the reason that causes circulating fluidized bed boiler coking have problem, the components of coal ash aspect of problem, boiler operatiopn and the operating aspect of air distribution plate design and installation quality aspect problem, advance the problem of stove fuel particle diameter distribution aspect etc.When relatively poor the or burner hearth furnace charge ignition temperature of furnace charge fluidisation situation is higher in circulating fluid bed boiler, the softening temperature that part or integral combustion temperature surpass coal ash can appear in the emulsion zone in the burner hearth, and then develop into inner of the boiler chamber material part or coking phenomenon appears in integral body, influence the normal fluidisation of furnace charge, and further worsen, at this moment, boiler must be out of service, and clear up and safeguard.The appearance of furnace charge coking phenomenon in the boiler furnace directly has influence on the safety and economic operation of boiler.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, thereby provide a kind of device for preventing circulating fluidized bed boiler from coking, that is: in the overall region of boiler furnace or the furnace charge ignition temperature of regional area rising trend appears, surpass the operating temperature of setting, in the time of the furnace charge coking phenomenon might occurring, temperature control executing agency in time opens the electric butterfly valve of steam regulation, in a wind, add steam, directly absorb the heat of burner hearth furnace charge by water vapour, carbon generation water vapour in water vapour and the high-temperature region burner hearth furnace charge decomposes the endothermic reaction and reduces the temperature of high-temperature region, thereby prevents or avoid burner hearth furnace charge generation coking phenomenon.
The technical scheme that provides according to the utility model, the prevention circulating fluidized bed boiler burns device and comprises that the outlet of CFBB is connected with gas-solid separator, the upper end outlet of gas-solid separator is connected on the boiler back end ductwork, the lower end outlet is connected on the CFBB, air preheater is located in the boiler back end ductwork, one time the wind blower fan is connected with boiler back end ductwork, the boiler air compartment is located at the CFBB below, air preheater links to each other with the boiler air compartment, the pipeline of described connection air preheater and boiler air compartment is provided with the vapor collection case, on the steam pipe that connects steam turbine and vapor collection case, be provided with the steam turbine intermediate extraction successively, steam is regulated electric butterfly valve, burner hearth emulsion zone in CFBB is provided with 2～4 thermocouple temperature measuring apparatus, at dilute-phase zone 1～2 pressure sensor is set, described thermocouple temperature measuring apparatus, the executing agency that pressure sensor and steam are regulated electric butterfly valve forms interlocking, is controlled by controller.
Be provided with second steam pipe between the second vapor collection case of described steam turbine intermediate extraction and boiler air compartment inside, the outlet of second steam pipe is arranged in the lower end of the blast cap import of easy coking position in the burner hearth, with a certain distance from the blast cap import, described second steam pipe is provided with second steam and regulates butterfly valve, and controller is controlled second steam and regulated electric butterfly valve.
The utility model is provided with steam pipe on the air preheater of CFBB and a wind airduct between the air compartment, steam is from steam turbine intermediate extraction or other superheated steam, and steam pipe is provided with the electric butterfly valve of steam regulation.When the fluctuation of the relevant parameter of boiler operatiopn big, inner of the boiler chamber material combustion position can change, when charge-temperature and bed pressure drop surpass the scope of controller setting, the furnace charge coking phenomenon may appear, at this moment, in time open the electric butterfly valve on the steam pipe, in a wind, add steam, the endothermic reaction that the carbon generation water vapour of heat absorption, steam and high temperature combustion zone by steam decomposes etc., can reduce the ignition temperature of burner hearth furnace charge fast, prevent or avoid CFBB burner hearth furnace charge generation coking phenomenon in running.
Compared with the prior art the utility model has the following advantages: simple and reasonable for structure, easy to maintenance; Adopt the water vapour decomposition reaction that the steam heat absorption heats up and steam takes place in the high-temperature region can reduce the burner hearth charge-temperature fast; When steam has just entered burner hearth, with the furnace charge direct heat transfer, be rapidly heated, volume increases rapidly, can improve the fluidized state of furnace charge; The water vapour decomposition reaction takes place in steam in the high-temperature region, produce fuel gas H
2And CO, H
2With CO subsequently with oxygen generation combustion reaction, improved the fired state of burner hearth furnace charge, help whole fire box temperature evenly.A wind ginseng is mixed steam and is reduced boiler hearth temperature, can fundamentally prevent and avoid boiler hearth of circulating fluidized bed furnace charge coking problem, and temperature adjustment speed is fast, and temperature adjustment reliability height has improved the security that CFBB moves.
Description of drawings
Fig. 1 is the device for preventing circulating fluidized bed boiler from coking schematic diagram.
Fig. 2 is the measure schematic diagram of the local coking of prevention CFBB.
Fig. 3 is instrument control principle figure.
The specific embodiment
Embodiment during following the utility model is incited somebody to action in conjunction with the accompanying drawings is further described:
As Fig. 1, Fig. 2, shown in Figure 3: the utility model is by CFBB 1, gas-solid separator 2, boiler back end ductwork 3, air preheater 4, a wind blower fan 5, steam turbine 6, vapor collection case 7, steam turbine intermediate extraction 8, steam pipe 9, steam is regulated electric butterfly valve 10, second steam is regulated electric butterfly valve 11, second steam pipe 12, the second vapor collection case 13, boiler air compartment 14, the 4th thermocouple 15, three thermocouple 16, second thermocouple 17, first thermocouple 18, second pressure sensor 19, first pressure sensor 20, controller 21 compositions such as grade.
On a wind air channel between air preheater 4 and the boiler air compartment 14, set up a steam pipe 9, on steam pipe 9, be provided with a steam and regulate electric butterfly valve 10 and vapor collection case 7, steam is from steam turbine intermediate extraction 8 or other superheated steam, vapor collection case 7 by a wind airduct outside, the steam demultiplexing is sent in wind, be convenient to the rapid mixing of steam and a wind.Be provided with the second vapor collection case 13 in the boiler air compartment 14 below CFBB 1, the second steam collection case 13 is provided with the electric butterfly valve 11 of second steam regulation by second steam pipe 12 UNICOMs steam turbine intermediate extraction or other superheated steam on second steam pipe 12.4 points for measuring temperature are set around the emulsion zone of burner hearth, be provided with the 4th thermocouple 15, three thermocouple 16, second thermocouple 17 and first thermocouple 18, dilute-phase zone at burner hearth is provided with 2 pressure taps, and forms differential pressure with air compartment, is provided with second pressure sensor 19 and first pressure sensor 20.The pressure detecting of the temperature detection of 4 thermocouples and 2 pressure sensors and the executing agency of electric butterfly valve form interlocking, by controller 21 controls.
For under various load operation situations, burner hearth furnace charge fluidisation is good, the boiler of local coking seldom occurs, cancels second steam pipe 12, second steam adjusting butterfly valve 11 and the second steam collection case 13.When boiler normally moved, the steam on the steam pipe 9 was regulated butterfly valve 10 and is closed; When the some temperature value measured in 4 temperature thermocouples of burner hearth emulsion zone reach design temperature upper limit T1, executing agency regulates electric butterfly valve 10 with the steam on the steam pipe 9 and opens, steam adds in the wind of preheating, steam absorbs heat in the burner hearth emulsion zone and heats up and carry out the water vapour decomposition reaction, fire box temperature reduces, when temperature value measured occurring in 4 temperature thermocouples of burner hearth emulsion zone and be lower than design temperature lower limit T2, and when having other temperature thermocouple measurement temperature to be lower than design temperature T1, executing agency closes electric butterfly valve 10; First pressure sensor 19 when 2 pressure taps of burner hearth dilute-phase zone) and the furnace pressure difference fluctuation measured of second pressure sensor 20 when surpassing setting value, control system is reported to the police, simultaneously, executing agency opens steam and regulates electric butterfly valve 10, after keeping certain hour, executing agency's steam off is regulated electric butterfly valve 10, if it is normal that the pressure differential that sensor is measured is recovered, then destroyed further developing of coking process, if the pressure differential that sensor is measured can not recover normal, then coking appears in burner hearth, needs further to handle.
The boiler that occurs the local coking of furnace charge for burner hearth easily, except that the front is provided with steam pipe 9 and steam adjusting butterfly valve 10, the second vapor collection case 13 is set in boiler air compartment 14, the second vapor collection case 13 is by the 12 UNICOMs steam turbine intermediate extraction 8 of second steam pipe or other superheated steam, and second steam pipe 12 is provided with the electric butterfly valve 11 of second steam regulation.The position of furnace charge coking often occurs according to boiler, at the blast cap import department certain distance of coking position correspondence, steam is set adds point, the steam that adds some is connected with the second vapor collection case 13 by pipeline, and an adding steam enters 10～15 blast caps through diffusion energy.When boiler normally moves, executing agency opens the second steam electric butterfly valve 11 on second steam pipe 12 at regular intervals, steam enters the burner hearth regional area by adding point, cool off position to the easy coking of furnace charge, and keep a period of time, then, executing agency closes the second steam electric butterfly valve, 11, the second steam electric butterfly valves, 11 cycle switches.When steam adjusting electric butterfly valve 10 was opened, the second steam electric butterfly valve 11 cut out.
The reason that steam reduces the burner hearth charge-temperature has two aspects: the vapor (steam) temperature that 1. enters boiler furnace is low more than the temperature of burner hearth furnace charge, and steam evenly disperses by a wind, and with the direct contact heat-exchanging of furnace charge particle of fluidisation in the burner hearth, the heat transfer rate is exceedingly fast; 2. the carbon generation water vapour decomposition reaction in steam and the high-temperature region burner hearth furnace charge, that is: C+H
2O → CO+H
2-131.5MJ/kmol, C+2H
2O → CO
2+ 2H
2-90.0MJ/kmol, the water vapour decomposition reaction is the endothermic reaction, by the high-temperature region water vapour decomposition reaction takes place and reduces fire box temperature.For the water vapour decomposition reaction, more than 1000 ℃ the time, the reaction speed that generates CO is far above generating CO
2Reaction speed, the caloric receptivity of water vapour decomposition reaction is big; And below 800 ℃, the water vapour decomposition reaction velocity is slow, and the burner hearth cooling is by the intensification of water vapour.
Claims (2)
1. device for preventing circulating fluidized bed boiler from coking, the outlet of CFBB (1) is connected with gas-solid separator (2), the upper end outlet of gas-solid separator (2) is connected on the boiler back end ductwork (3), the lower end outlet of gas-solid separator (2) is connected on the CFBB (1), air preheater (4) is located in the boiler back end ductwork (3), a wind blower fan (5) is connected with boiler back end ductwork (3), boiler air compartment (14) is located at the below of CFBB (1), air preheater (4) links to each other with boiler air compartment (14), it is characterized in that described connection air preheater (4) is provided with vapor collection case (7) with the pipeline of boiler air compartment (14); On the steam pipe (9) that connects steam turbine (6) and vapor collection case (7), be provided with steam turbine intermediate extraction (8) successively and regulate electric butterfly valve (10) with steam; Burner hearth emulsion zone in CFBB (1) is provided with 2～4 thermocouple temperature measuring apparatus, at dilute-phase zone 1～2 pressure sensor is set; The executing agency that described thermocouple temperature measuring apparatus, pressure sensor and steam are regulated electric butterfly valve forms interlocking, is controlled by controller (21).
2. device for preventing circulating fluidized bed boiler from coking according to claim 1, it is characterized in that, be provided with second steam pipe (12) between the second vapor collection case (13) of described steam turbine intermediate extraction (8) and boiler air compartment (14) inside, the outlet of second steam pipe (12) is arranged in the burner hearth lower end of the blast cap import of coking position easily, and and the blast cap import between spacing is arranged; Described second steam pipe (12) is provided with second steam and regulates butterfly valve (11), and controller (21) control second steam is regulated electric butterfly valve (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202696591U CN201582808U (en) | 2009-10-31 | 2009-10-31 | Prevention circulating fluidized bed boiler coking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202696591U CN201582808U (en) | 2009-10-31 | 2009-10-31 | Prevention circulating fluidized bed boiler coking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201582808U true CN201582808U (en) | 2010-09-15 |
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ID=42724809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202696591U Expired - Lifetime CN201582808U (en) | 2009-10-31 | 2009-10-31 | Prevention circulating fluidized bed boiler coking device |
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| Country | Link |
|---|---|
| CN (1) | CN201582808U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696799B (en) * | 2009-10-31 | 2011-05-25 | 无锡华光工业锅炉有限公司 | Device for preventing circulating fluidized bed boiler from coking |
| CN106678787A (en) * | 2017-02-08 | 2017-05-17 | 国家电投集团江西电力有限公司分宜发电厂 | Banked fire protection method and system |
-
2009
- 2009-10-31 CN CN2009202696591U patent/CN201582808U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696799B (en) * | 2009-10-31 | 2011-05-25 | 无锡华光工业锅炉有限公司 | Device for preventing circulating fluidized bed boiler from coking |
| CN106678787A (en) * | 2017-02-08 | 2017-05-17 | 国家电投集团江西电力有限公司分宜发电厂 | Banked fire protection method and system |
| CN106678787B (en) * | 2017-02-08 | 2019-02-15 | 国家电投集团江西电力有限公司分宜发电厂 | Banking fire guard method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100915 Effective date of abandoning: 20091031 |