CN201568959U - Coking prevention device of gas-solid separator of circulating fluidized bed boiler - Google Patents
Coking prevention device of gas-solid separator of circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN201568959U CN201568959U CN2009202693076U CN200920269307U CN201568959U CN 201568959 U CN201568959 U CN 201568959U CN 2009202693076 U CN2009202693076 U CN 2009202693076U CN 200920269307 U CN200920269307 U CN 200920269307U CN 201568959 U CN201568959 U CN 201568959U
- Authority
- CN
- China
- Prior art keywords
- gas
- solid separator
- temperature
- thermocouple
- outlet
- 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.)
- Expired - Lifetime
Links
Images
Abstract
The utility model relates to a coking prevention device of a gas-solid separator of a circulating fluidized bed boiler. According to the technical scheme provided by the utility model, a low-temperature medium communicating pipe is arranged at an inlet of a gas-solid dust remover, and a low-temperature medium is from middle extraction steam of a turbine or smoke at an outlet of a boiler induced draught fan; and an electric butterfly valve is additionally arranged on the pipe, and a temperature measuring device is respectively arranged at an inlet, and an outlet and a discharge port of the gas-solid separator, When coal dust in the gas-solid separator continues to burn, and the temperature of smoke rises, the phenomenon that coal dust is coked in the gas-solid separator to block a discharge port possibly happens; at the moment, the temperature is set according to a controller, and the electric butterfly valve is opened by an actuator, and the low-temperature medium is timely mixed with high-temperature smoke, so that the temperature of the high-temperature smoke drops so as to eliminate the coking phenomenon of the coal dust in the gas-solid separator. The utility model adopts the low-temperature medium to reduce the temperature of the smoke in the gas-solid separator, and has fast temperature regulation speed and high temperature regulation reliability.
Description
Technical field
The utility model relates to a kind of boiler, and specifically a kind of device for preventing circulating fluidized bed boiler from coking is used for the cooling of gas-solid separator of boiler for circulating fluidized bed flue gas.
Background technology
Fluidized bed combustion belongs to the clean combustion of coal technology, advantages that they are a lot of unique, be conventional boiler can't realize: fuel tolerance is wide, can use unburnable coal and various low heat value, high ash content colm, and the solid refuse the like waste; Because the repeatedly circulation of coal ash and fuel for fuel provides enough tail-off times, obviously descends unburned carbon in flue dust, therefore, the efficiency of combustion height; The adjustable range of boiler load is more much bigger than coal-powder boiler; The combustion intensity height of boiler, lime-ash are easy to realize comprehensive utilization; Because the ignition temperature of coal in burner hearth is low, the NOx growing amount is few; When in burner hearth, adding agstone, can directly carry out flue gas desulfurization, reduced the investment of coal burning flue gas desulfurization equipment and the operating cost in the sweetening process widely.Therefore, CFBB enjoys user's favor, has stronger competitiveness, and the improvement development speed of equipment is very fast.
Because operating condition changes and the variation of coal, the overtemperature coking of the combustion chamber of CFBB, gas-solid separator, material returning device has become the ubiquitous serious problems of fluidized-bed combustion boiler.Particularly in that to use flammability relatively poor, the fuel that tail-off time is long, short grained fuel can not after-flame at burner hearth emulsion zone and dilute-phase zone, carried secretly by flue gas and to enter gas-solid separator, because the existence of oxygen in the flue gas, these fuel burn away in gas-solid separator, flue gas in the gas-solid separator heats up, when flue-gas temperature arrives the softening temperature of coal ash, coal dust in the gas-solid separator bonds and coking mutually, fall into gas separating device bottom discharging mouth, and obstruction discharge gate, the coal dust that hinders gas-solid separator to collect returns boiler combustion, simultaneously, piles up a large amount of coal dusts in the gas-solid separator, influence the separating effect of gas-solid separator, injured 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 coking device in a kind of prevention gas-solid separator of boiler for circulating fluidized bed, utilize the high-temperature flue gas in the cryogenic media gaseous mixture solid separator that is had in the operation boiler, flue-gas temperature in the gas-solid separator is descended, avoid the coal dust coking in the gas-solid separator and stop up discharge gate.
According to the technical scheme that the utility model provides, the import of horizontal flue links to each other with the outlet of CFBB, and the outlet of horizontal flue is connected with gas-solid separator; One end of gas-solid separator exhaust pass and gas-solid separator in succession, the other end is connected with boiler back end ductwork; Between boiler back end ductwork and chimney, be provided with smoke duster, air-introduced machine successively; The material returning device that is installed under the gas-solid separator links to each other with CFBB; Gas approach place at gas-solid separator adds low-temperature cooling media; It is characterized in that on horizontal flue, being provided with a steam pipe, one end of steam pipe connects the low temperature superheater outlet of steam turbine intermediate extraction pipe or gland steam exhauster or boiler, the other end of steam pipe has spacing by the inside that the distributing pipe on the cryogenic media collection case inserts horizontal flue between the inwall of described distributing pipe and horizontal flue; Steam pipe is provided with the electric butterfly valve of a steam regulation; First thermocouple is set on horizontal flue, and the discharge gate of gas-solid separator is provided with second thermocouple, and the exhanst gas outlet of gas-solid separator is provided with three thermocouple; The executing agency of described first thermocouple, second thermocouple and three thermocouple and electric butterfly valve forms interlocking, is controlled by controller.
Perhaps, the import of horizontal flue links to each other with the outlet of CFBB, and the outlet of horizontal flue is connected with gas-solid separator; One end of gas-solid separator exhaust pass and gas-solid separator in succession, the other end is connected with boiler back end ductwork; Between boiler back end ductwork and chimney, be provided with smoke duster and air-introduced machine successively; The material returning device that is installed under the gas-solid separator links to each other with CFBB; Gas approach place at gas-solid separator adds low-temperature cooling media; It is characterized in that: flue is set on boiler horizontal gas pass; One end of described flue links to each other with the outlet of air-introduced machine, and the other end has spacing by the inside that the distributing pipe on the cryogenic media collection case inserts horizontal flue between the inwall of described automobile fitting pipe and horizontal flue; On steam pipe, be provided with the electric butterfly valve of a steam regulation; First thermocouple is set on horizontal flue, second thermocouple is set, three thermocouple is set at the exhanst gas outlet of gas-solid separator at the discharge gate of gas-solid separator; The executing agency of described first thermocouple, second thermocouple and three thermocouple and electric butterfly valve forms interlocking, is controlled by controller.
Import department at the gas-solid deduster is provided with the cryogenic media cross over pipe, and cryogenic media is set up electric butterfly valve from steam turbine intermediate extraction or boiler induced-draft fan outlet flue gas on the pipe, at gas-solid separator import, outlet and discharge gate temperature measuring equipment is set.Coal dust burns away when existing in the gas-solid separator, when flue gas raises, may cause coal dust coking in the gas-solid separator, stop up discharge gate, at this moment, according to the controller design temperature, executing agency opens electric butterfly valve, and cryogenic media in time ginseng is mixed in the high-temperature flue gas, high-temperature flue-gas descends, and avoids the generation of coal dust coking phenomenon in the gas-solid separator.The utility model adopts cryogenic media to reduce flue-gas temperature in the gas-solid separator, and temperature adjustment speed is fast, temperature adjustment reliability height.
Compared with the prior art the utility model has the following advantages:
Cryogenic media directly mixes with high-temperature flue gas, and heat transfer rate is fast, and good effect of heat exchange can in time stop the coal dust coking in the gas-solid separating device.The technology that this utility model is implemented is simple, and the reliability height helps the long safety and economic operation of CFBB.
Description of drawings
The schematic diagram of flue gas in Fig. 1 water vapour cold gas solid separator.
The schematic diagram of flue gas in Fig. 2 boiler tail flue gas cold gas solid separator.
The temperature controlled schematic diagram of Fig. 3.
The specific embodiment
Embodiment during following the utility model is incited somebody to action in conjunction with the accompanying drawings is further described:
As shown in Figure 1, 2, 3: the utility model is by CFBB 1, horizontal flue 2, first thermocouple 3, three thermocouple 4, gas-solid separator exhaust pass 5, gas-solid separator 6, boiler back end ductwork 7, smoke duster 8, air-introduced machine 9, chimney 10, steam turbine 11, steam turbine intermediate extraction pipeline 12, second thermocouple 13, material returning device 14, electric butterfly valve 15, cryogenic media collection case 16, distributing pipe 17, temperature controller 18.
The import of horizontal flue 2 links to each other with the outlet of CFBB 1, and the outlet of horizontal flue 2 is connected with gas-solid separator 6; One end of gas-solid separator exhaust pass 5 and gas-solid separator 6 in succession, the other end is connected with boiler back end ductwork 7; Between boiler back end ductwork 7 and chimney 10, be provided with smoke duster 8, air-introduced machine 9 successively; The material returning device 14 that is installed under the gas-solid separator 6 links to each other with CFBB 1; Gas approach place at gas-solid separator 6 adds low-temperature cooling media; Described low-temperature cooling media can be steam or boiler tail flue gas.
When adopting steam as cooling medium, as shown in Figure 1, on the horizontal flue 2 of CFBB 1, a jet chimney is set, steam pipe one end connects the low temperature superheater outlet of steam turbine intermediate extraction pipe 12 or gland steam exhauster or boiler, the inside that the other end inserts horizontal flue 2 by the distributing pipe on the cryogenic media collection case 16 17, the inwall of distributing pipe 17 dried up flat flues 2 has certain distance, on steam pipe, set up the electric butterfly valve 15 of a steam regulation, first thermocouple 3 is set on horizontal flue 2, at gas-solid separator discharge gate and exhanst gas outlet second thermocouple 13 and the three thermocouple 4 is set respectively, the executing agency of described three thermocouple temperature measuring apparatus and electric butterfly valve 15 forms interlocking.During normal the operation, the electric butterfly valve 15 of steam regulation cuts out; The temperature value that records when three thermocouples has one to be higher than the ceiling temperature T that sets separately
1The time, executing agency opens the electric butterfly valve 15 of steam regulation, and steam enters in the gas-solid separator 6 and fully mixes with flue gas, directly absorbs flue gas heat and heats up, and the flue-gas temperature in the gas-solid separator 6 is descended; The flue-gas temperature value of measuring when the three thermocouple 4 of the smoke outlet of gas-solid separator 6 is lower than the lower limit temperature T of setting
2The time, executing agency closes electric butterfly valve 15.Meanwhile, actively regulate the burner hearth fired state.
When adopting boiler tail flue gas as cooling medium, as shown in Figure 2, on the horizontal flue 2 of CFBB 1, a smoke conveying duct is set, flue gas delivery pipe one end connects the outlet of boiler induced-draft fan 9, the inside that the other end inserts horizontal flue 2 by the distributing pipe on the collection case 16 17, the inwall certain distance of distributing pipe 17 dried up flat flues 2 is set up an electric butterfly valve 15 of regulating flue gas on flue gas delivery pipe.Situation when the executing agency of the position of point for measuring temperature, temperature measuring equipment, control electric butterfly valve and execution are being moved with steam as cooling medium is consistent.
In order to prevent that thermocouple is worn; thermocouple is placed in the sleeve pipe; can in time respond to flue-gas temperature in order to make thermocouple; prevent that temperature sensor from lagging behind; box face is opened wide to flue gas one end; and a plurality of perforates on sleeve pipe, flue gas can be flowed at thermocouple temperature sensitive point, the lead-in wire of thermocouple is protected with porcelain bushing.
When cryogenic media is water vapour, need not set up power source in addition,, directly from steam generator system, draw steam according to the pressure requirement; If cryogenic media is the flue gas of air-introduced machine outlet, according to designing and calculating, whether decision gas-solid separator cooling system sets up smoking gas blower fan.
Claims (2)
1. device that prevents coking in the gas-solid separator of boiler for circulating fluidized bed, the import of horizontal flue (2) links to each other with the outlet of CFBB (1), and the outlet of horizontal flue (2) is connected with gas-solid separator (6); One end of gas-solid separator exhaust pass (5) and gas-solid separator (6) in succession, the other end is connected with boiler back end ductwork (7); Between boiler back end ductwork (7) and chimney (10), be provided with smoke duster (8), air-introduced machine (9) successively; The material returning device (14) that is installed under the gas-solid separator (6) links to each other with CFBB (1); Gas approach place at gas-solid separator (6) adds low-temperature cooling media; It is characterized in that: on horizontal flue (2), a steam pipe is set, one end of steam pipe connects the low temperature superheater outlet of steam turbine intermediate extraction pipe (12) or gland steam exhauster or boiler, the other end of steam pipe has spacing by the inside that the distributing pipe (17) on the cryogenic media collection case (16) inserts horizontal flue (2) between the inwall of described distributing pipe (17) and horizontal flue (2); Steam pipe is provided with the electric butterfly valve (15) of a steam regulation; First thermocouple (3) is set on horizontal flue (2), and the discharge gate of gas-solid separator (6) is provided with second thermocouple (13), and the exhanst gas outlet of gas-solid separator (6) is provided with three thermocouple (4); Described first thermocouple (3), second thermocouple (13) and three thermocouple (4) form interlocking with the executing agency of electric butterfly valve (15), are controlled by controller (18).
2. device that prevents coking in the gas-solid separator of boiler for circulating fluidized bed, the import of horizontal flue (2) links to each other with the outlet of CFBB (1), and the outlet of horizontal flue (2) is connected with gas-solid separator (6); One end of gas-solid separator exhaust pass (5) and gas-solid separator (6) in succession, the other end is connected with boiler back end ductwork (7); Between boiler back end ductwork (7) and chimney (10), be provided with smoke duster (8) and air-introduced machine (9) successively; The material returning device (14) that is installed under the gas-solid separator (6) links to each other with CFBB (1); Gas approach place at gas-solid separator (6) adds low-temperature cooling media; It is characterized in that: flue is set on boiler horizontal gas pass; One end of described flue links to each other with the outlet of air-introduced machine (9), and the other end has spacing by the inside that the distributing pipe (17) on the cryogenic media collection case (16) inserts horizontal flue (2) between the inwall of described automobile fitting pipe (17) and horizontal flue (2); On steam pipe, be provided with the electric butterfly valve (15) of a steam regulation; First thermocouple (3) is set on horizontal flue (2), second thermocouple (13) is set, three thermocouple (4) is set at the exhanst gas outlet of gas-solid separator (6) at the discharge gate of gas-solid separator (6); Described first thermocouple (3), second thermocouple (13) and three thermocouple (4) form interlocking with the executing agency of electric butterfly valve (15), are controlled by controller (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202693076U CN201568959U (en) | 2009-10-31 | 2009-10-31 | Coking prevention device of gas-solid separator of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202693076U CN201568959U (en) | 2009-10-31 | 2009-10-31 | Coking prevention device of gas-solid separator of circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201568959U true CN201568959U (en) | 2010-09-01 |
Family
ID=42661250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202693076U Expired - Lifetime CN201568959U (en) | 2009-10-31 | 2009-10-31 | Coking prevention device of gas-solid separator of circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201568959U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997271A (en) * | 2012-12-19 | 2013-03-27 | 上海艾能电力工程有限公司 | Method and system for avoiding slagging of circulating fluid bed boiler furnace |
| CN104373163A (en) * | 2013-08-16 | 2015-02-25 | 冯伟忠 | Method for expanding application of steam extracted by steam turbine |
-
2009
- 2009-10-31 CN CN2009202693076U patent/CN201568959U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997271A (en) * | 2012-12-19 | 2013-03-27 | 上海艾能电力工程有限公司 | Method and system for avoiding slagging of circulating fluid bed boiler furnace |
| CN104373163A (en) * | 2013-08-16 | 2015-02-25 | 冯伟忠 | Method for expanding application of steam extracted by steam turbine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201599791U (en) | Device for eliminating coking of material returner of fluidized-bed boiler | |
| CN201885203U (en) | Horizontal type internal combustion three-return shell boiler capable of burning biomass, fuel oil or gas | |
| CN203517771U (en) | Middle-temperature separating circulating fluidized bed boiler applicable to combusting high-sodium coal | |
| CN101701707B (en) | Device for preventing coal dust in gas-solid separator of boiler for circulating fluidized bed from coking | |
| CN203190418U (en) | Novel garbage pyrolysis incineration equipment | |
| CN204574017U (en) | A kind of CFBB with air stage feeding combustion system | |
| CN102818257A (en) | Heat accumulating type direct-fired boiler using biomass fuel | |
| CN101881433A (en) | Steam boiler capable of burning biomass | |
| US9927119B2 (en) | Dual-bed system for preventing boiler heating surface from being contaminated | |
| CN101696799B (en) | Device for preventing circulating fluidized bed boiler from coking | |
| CN201568959U (en) | Coking prevention device of gas-solid separator of circulating fluidized bed boiler | |
| CN102563858B (en) | Complementary combustion device for low temperature waste heat power generation | |
| CN102252325B (en) | Circulating fluidized bed boiler capable of burning rice husks | |
| CN201059534Y (en) | Boiler for chemical industry producing | |
| CN203880691U (en) | Chimney-free multifunctional oil/gas-fired boiler | |
| CN206073089U (en) | It is a kind of to relate to boiler thermodynamic system of the cigarette garbage as fuel | |
| CN205991483U (en) | Pluralities of fuel high-temperature gasification boiler using reducing process denitration | |
| CN205174352U (en) | Prevention coking device of circulating fluidized bed boiler | |
| CN204986988U (en) | Bed boiler fuel detonation suppressant system that damps down is vulcanized in circulation | |
| CN201212729Y (en) | Biomass granular fuel boiler | |
| CN204084433U (en) | Two drum longitudinal chain grate boiler | |
| CN105588114A (en) | Vertical type semi-gasification biomass burning boiler | |
| CN201582808U (en) | Prevention circulating fluidized bed boiler coking device | |
| CN201373554Y (en) | New energy gasified no-chimney energy-saving environment-friendly boiler | |
| CN106090893A (en) | A kind of high performance clean burning method of coal-burning boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100901 Effective date of abandoning: 20091031 |