CN208504373U - Use the circulating fluidized bed boiler of Indonesia coal - Google Patents

Abstract

The utility model relates to boiler plant fields, specially a kind of circulating fluidized bed boiler for using Indonesia coal, it can effectively solve the problem that coking and chute blockage problem, burner hearth lower end is provided with coal supply system, primary air system and secondary air system, burner hearth upper end connects back-end ductwork by cyclone separator, revert system is provided between the lower part outlet and burner hearth lower end of cyclone separator, coal supply system includes the coal spout being in tilted layout, coal spout upper end connects feeder with expansion joint by adapter tube, primary air system includes First air ignition air duct and wind area cloth wind structure, secondary air system includes upper layer secondary air intake pipe and lower layer's secondary air intake pipe, it is characterized in that, coal spout includes top coal spout and lower part coal spout, top coal spout and the angle of Y-axis are less than the angle of lower part coal spout and Y-axis, lower part is led in the outlet of top coal spout The entrance of coal spout, the entrance of lower part coal spout are set to its side, and the lower section of lower part coal spout outlet is provided with coal breakage plate.

Description

Use the circulating fluidized bed boiler of Indonesia coal

Technical field

The utility model relates to boiler plant field, specially a kind of circulating fluidized bed boiler for using Indonesia coal.

Background technique

Country in Southeast Asia's coal electricity industry is gradually developed in recent years, and especially based on Indonesia, Indonesia's coal for power generation is main For local lignite, feature is that moisture is high, ash content is low, volatile matter is high.Though can be burnt with coal-powder boiler, due to NOx and SO₂Row It puts value and is higher than local environmental protection policy requirement, need mating corresponding environment friendly system, lead at high cost, system complex.Therefore environmental protection characteristic Excellent circulating fluidized bed boiler receives the favor of local government and enterprise.

Domestic boiler maker is when providing boiler product for Indonesia locality user, and not to be noted Indonesia coal is special Property, still use with domestic same or similar structure, such as Patent No. ZL2017201356402, with more and more following Circulation fluidized bed boiler puts into operation, and some problems gradually expose out, the problems such as such as chute blockage, coking occurs.

Summary of the invention

In order to solve the problem of that existing burning overtemperature causes coking to be easy to happen chute blockage, the utility model provides one kind The circulating fluidized bed boiler for using Indonesia coal can effectively solve the problem that coking and chute blockage problem.

Its technical solution is such that a kind of circulating fluidized bed boiler for using Indonesia coal comprising burner hearth, the burner hearth Lower end is provided with coal supply system, primary air system and secondary air system, and the burner hearth upper end connects tail portion by cyclone separator Flue is provided with revert system, the coal supply system packet between the lower part outlet of the cyclone separator and the burner hearth lower end The coal spout of inclination arrangement is included, the coal spout upper end connects feeder, the primary air system packet with expansion joint by adapter tube First air ignition air duct and wind area cloth wind structure are included, the secondary air system includes upper layer secondary air intake pipe and lower layer's Secondary Air Blast pipe, which is characterized in that the coal spout includes top coal spout and lower part coal spout, the top coal spout and Y-axis Angle is less than the angle of lower part coal spout and Y-axis, and lead to the entrance of the lower part coal spout for the outlet of the top coal spout, institute The entrance for stating lower part coal spout is set to its side, and the lower section of the lower part coal spout outlet is provided with coal breakage plate, along coal breakage Direction, the top coal spout, lower part coal spout, the top of the entrance of coal breakage plate, top coal spout exit are respectively arranged with / coal spread wind mouth is sent, the coal spread wind mouth positioned at top coal spout exit is disposed vertically downward；The First air igniting Air duct bottom is provided with primary air intake pipe, the upper layer secondary air intake pipe and lower layer's secondary air intake pipe and horizontal plane Angle is 27-33 °, and First air and Secondary Air ratio are 45:55.

It is further characterized by, the angle between the top coal spout and the adapter tube is 148-152 °, it is described on The angle of portion's coal spout and the lower part coal spout is 13-17 °, and the angle of the lower part coal spout and the coal breakage plate is 15 °, The coal spread wind pipe is flattened rectangular pipe；

The First air ignition air duct is arranged side by side with 2-4, the section of the First air ignition air duct along First air into Wind wind direction becomes larger, and the centerlines of the center line of the primary air intake pipe and the First air ignition air duct are 30- 45°；

The upper layer secondary air intake pipe and lower layer's secondary air intake pipe is arranged independently of each other and inside is provided with Control valve, it is 30%-35% that the air output of lower layer's secondary air intake pipe, which accounts for the total air output ratio of Secondary Air, and the upper layer is secondary Wind blast pipe is apart from 4 meters of air distribution plate, and lower layer's secondary air intake pipe is apart from 2 meters of air distribution plate；

There are two the cyclone separator is arranged side by side, the cyclone separator includes separator inlet flue duct and separator Ontology, the separator inlet flue duct are arranged at left and right sides of the top Hou Qiang of the burner hearth, and the separator inlet flue duct is long Degree is more than or equal to 7 meters, and angle is 174 ± 5 ° between the separator inlet flue duct lateral wall and the side wall of the burner hearth, described Separator inlet flue duct inner sidewall is two sections of folding faces, outside the folding face being connected with the burner hearth and the separator inlet flue duct The angle of side wall is 39 ± 5 °, and the angle of another section of folding face and the separator inlet flue duct lateral wall is 10 ± 1 °；

The revert system includes U-shaped return box, and U-shaped return box one end connects the rotation by inlet connecting branch road The outlet of wind separator bottom, the U-shaped return box other end connect the burner hearth, the U-shaped returning charge by outlet connecting pipe road Case includes top material returning device case and lower part returning charge bellows, and the lower part returning charge bellows include the loosening air compartment sequentially arranged, flowing Air compartment and returning charge air compartment, the loosening air compartment are set to immediately below the cyclone separator outlet at bottom, the returning charge air compartment cloth It is disposed adjacent to the burner hearth side, it is described to loosen air compartment, flow air compartment, the side wall of returning charge air compartment is provided with air-vent and compresses sky Gas blow valve port, it is described loosen air compartment, flowing air compartment, returning charge air compartment bottom be provided with ash port, the ash port bottom connection Ash tube is provided with air distribution plate, is equipped on the air distribution plate between the top material returning device case and the lower part returning charge bellows Through the material returning device blast cap of the air distribution plate；

Outlet connecting pipe road end face is provided with lime stone import, and the lime stone import is continuously fed to agstone.

After the utility model, since coal spout is divided into top coal spout and lower part coal spout, along coal breakage direction, on Portion's coal spout, lower part coal spout, coal breakage plate entrance above be respectively arranged with and send/coal spread wind mouth, top coal spout exit Coal spread wind mouth is set, and coal spread wind mouth is disposed vertically downward, and can be preferably sent into coal dust by coal spread wind pipe and air port of delivering coal Burner hearth will not block in coal spout, efficiently solve the problems, such as chute blockage, meanwhile, primary air intake pipe is set to First air igniting Air duct bottom, air inlet is more uniform, improves fluidization efficiency, and the angle of secondary air intake pipe is rationally arranged, upper layer Secondary Air Blast pipe passes through setting possible angle face coal by the way that reasonable angle preferably supplemental oxygen, lower layer's secondary air intake pipe is arranged Powder combustion zone, has been effectively ensured efficiency of combustion, and first and second wind system can effectively solve Indonesia coal coking after optimizing is asked Topic.

Detailed description of the invention

Fig. 1 is the utility model structure diagram；

Fig. 2 is the structural schematic diagram of coal supply system in the utility model；

Fig. 3 is the structural schematic diagram of primary air system in the utility model；

Fig. 4 is the top view of Fig. 3；

Fig. 5 is the structural schematic diagram of secondary air system in the utility model；

Fig. 6 is the structural schematic diagram of cyclone separator in the utility model；

Fig. 7 is the overlooking state schematic diagram in Fig. 6；

Fig. 8 is the structural schematic diagram of revert system in the utility model.

Specific embodiment

As shown in Fig. 1 to Fig. 8 comprising burner hearth 1,1 lower end of burner hearth are provided with coal supply system 2, primary air system 3 and secondary Wind system 4,1 upper end of burner hearth connect back-end ductwork 6 by cyclone separator 5, are disposed with reheater 7, superheater in back-end ductwork 6 8, economizer 9, air preheater 10 are provided with revert system 11 between 1 lower end of lower part outlet and burner hearth of cyclone separator 5, give coal System 2 includes the top coal spout 12 and lower part coal spout 13 of the inclination arrangement of two-part, and coal spout 12 upper end in top is by connecing Pipe 14 and expansion joint 15 connect feeder 16, and top coal spout 12 is less than the folder of lower part coal spout 13 and Y-axis with the angle of Y-axis Angle guarantees the reliable landing of coal dust, and lead to the entrance of lower part coal spout 13 for the outlet of top coal spout 12, lower part coal spout 13 Entrance is set to its side, and the lower section that lower part coal spout 13 exports is provided with coal breakage plate 17, along coal breakage direction, top coal spout 12, air port 19 of delivering coal, the setting of top coal spout exit are respectively arranged with above the entrance of lower part coal spout 13, coal breakage plate 17 Coal spread wind mouth 18, coal spread wind mouth 18 are disposed vertically downward；Angle between top coal spout 12 and adapter tube 14 is 148-152 °, on Coal spread wind pipe 18 at portion's coal spout 12 is disposed vertically downward, and the angle of top coal spout 12 and lower part coal spout 13 is 13- 17 °, lower part coal spout 13 and the angle of coal breakage plate 17 are 15 °, and the falling speed that reasonable angle guarantees coal dust, coal spread wind is arranged Pipe 18 is flattened rectangular pipe, and flattened rectangular pipe can be improved coal spread wind speed, prevent chute blockage and sow coal dust in burner hearth 1 Even, the coal dust fallen from adapter tube 14 is sent into top coal spout 12 and fallen by air hose 19 of delivering coal, and enters lower clan when reaching bottom Coal pipe 13, the coal spread wind pipe 18 of 12 lower end of top coal spout give one downward blowing force of coal dust, guarantee herein will not chute blockage, enter The coal dust of lower part coal spout 13 drops down onto plate 17 of delivering coal via the coal spread wind pipe 18 of upper end, and coal is sent into furnace by coal spread wind pipe 18 herein Thorax 1, each turning point have coal spread wind pipe 18 to deliver coal, solve the problems, such as chute blockage.

Primary air system 3 includes First air ignition air duct 20 and wind area cloth wind structure 21, and First air ignition air duct 20 is side by side 2-4 are disposed with, the section of First air ignition air duct 20 becomes larger along First air air inlet wind direction, 20 bottom of First air ignition air duct Portion is provided with primary air intake pipe 22, and the centerlines of the center line and First air ignition air duct 20 of primary air intake pipe 22 are 30-45 °, integral arrangement can make First air uniformly distributed along entire fluidisation bed surface equipressure, formed in wind area cloth wind structure 23 etc. Air compartment is pressed, guarantees that fluidisation uniformly, further solves coking problem.

Secondary air system 4 includes upper layer secondary air intake pipe 24 and lower layer's secondary air intake pipe 25, upper layer Secondary Air air inlet Pipe 24 and 25 angle with horizontal plane of lower layer's secondary air intake pipe are 27-33 °, and most preferably 30 °, First air and Secondary Air ratio are 45:55 guarantees that the reducing atmosphere of bottom section, upper layer secondary air intake pipe 24 and lower layer's secondary air intake pipe 25 are set independently of each other It sets and inside is provided with control valve 38, it is 30%- that the air output of lower layer's secondary air intake pipe 25, which accounts for the total air output ratio of Secondary Air, 35%, may be implemented individually to control air quantity, can make to burn more uniform, upper layer secondary air intake pipe 24 apart from 4 meters of air distribution plate, under Layer secondary air intake pipe 25 is apart from 2 meters of air distribution plate, so that bed temperature is reasonably distributed.

There are two cyclone separator 5 is arranged side by side, cyclone separator 5 includes separator inlet flue duct 25 and separator body 26, separator inlet flue duct 25 is arranged at left and right sides of the top Hou Qiang of burner hearth 1, and 25 length of separator inlet flue duct is more than or equal to It 7 meters, increases the flow of flue gas for after flue to enter and stablizes, it is not easy to occur because flue gas disorder shows caused by flue is too short As angle is 174 ± 5 ° between 25 lateral wall of separator inlet flue duct and the side wall 39 of burner hearth 1, in separator inlet flue duct 25 Side wall is two sections of folding faces, and the folding face being connected with burner hearth 1 and the angle of 25 lateral wall of separator inlet flue duct are 39 ± 5 °, Ling Yiduan The angle of folding face and 25 lateral wall of separator inlet flue duct is 10 ± 1 °, and 25 inner sidewall of separator inlet flue duct is by three original foldings Face is changed to two folding faces, and opening angle increases, and is conducive to flue gas air inlet, and after integral layout changes, flue gas and dust be can be easily separated, Dust is sent into rear end revert system, and flue gas will not enter, and improves separative efficiency, to reduce burning in returning charge rear hearth 1 Temperature further prevents coking.

Revert system 11 includes U-shaped return box, and U-shaped return box one end connects cyclone separator by inlet connecting branch road 27 5 outlet at bottom, the U-shaped return box other end connect burner hearth 1 by outlet connecting pipe road 28, and U-shaped return box includes top material returning device Case 29 and lower part returning charge bellows, lower part returning charge bellows include the loosening air compartment 30 sequentially arranged, flowing air compartment 31 and returning charge air compartment 32, it loosens air compartment 30 and is set to immediately below 5 outlet at bottom of cyclone separator, returning charge air compartment 32 is arranged in close to 1 side of burner hearth, pine Dynamic air compartment 30, flowing air compartment 31, returning charge air compartment 32 side wall be provided with air-vent 33 and compressed air purging mouth 34, when in air compartment It when chute blockage occurs, can be carried out purging by compressed air purging mouth 34, ensure that operational reliability, loosen air compartment 30, stream Move air compartment 31, the bottom of returning charge air compartment 32 is provided with ash port, ash port bottom connection ash tube 35,29 He of top material returning device case It is provided with air distribution plate 36 between lower part returning charge bellows, the material returning device blast cap through air distribution plate 36 is installed on air distribution plate 36；Going out 28 upper surface of mouth connecting line is provided with lime stone import 37, and lime stone import 37 is continuously fed to agstone, lime stone and returning charge Burner hearth 1 is returned after mixing and participates in Matter Transfer, conducive to improving desulfuration efficiency and increasing material concentration in furnace.

Described under utility model works schematic diagram: Indonesia coal enters burner hearth 1 from coal supply system 2, and from primary air system 3, secondary air system 4 enter burner hearth 1 primary and secondary air, 1 internal classification of burner hearth burn, and with by be located at revert system 11 at The agstone that outlet connecting pipe road 28 is accessed carries out desulphurization reaction, sloughs sulfur dioxide most in flue gas, generation Calcium sulfate has been supplemented in circulating ash, and after flue gas is separated by cyclone separator 5, most circulating ash is returned by what is optimized Material system 11 returns to burner hearth 1, the flying dust of remaining fraction relatively fine particle pass sequentially through the reheater 7 of back-end ductwork 6, superheater 8, Economizer 9, air preheater 10, finally enter the dust-extraction unit of rear end from exhaust pass.

Compared with prior art, the utility model has the advantage that

(1) into coal it is smooth-by advanced coal spout structure, even if the moisture of lignite is big again, also can guarantee not chute blockage.

(2) bed temperature rationally-the efficient circulation circuit of separator and revert system composition, the recycle stock increased in furnace is dense Degree, and then the caloric receptivity of furnace internal heating surface is increased, the ignition temperature of burner hearth is reduced, ensure that the power output of boiler.

(3) reliable and stable-by the reasonable Arrangement of a Secondary Air, the generation of coking is avoided, while that no setting is required is online Bed material system is added, guarantees that boiler is safely operated steadily in the long term.

Claims (7)

1. a kind of circulating fluidized bed boiler for using Indonesia coal comprising burner hearth, the burner hearth lower end are provided with coal supply system, one Secondary wind system and secondary air system, the burner hearth upper end connect back-end ductwork by cyclone separator, the cyclone separator Revert system is provided between lower part outlet and the burner hearth lower end, the coal supply system includes the coal spout being in tilted layout, institute It states coal spout upper end and feeder is connected with expansion joint by adapter tube, the primary air system includes First air ignition air duct and Feng Qu Cloth wind structure, the secondary air system include upper layer secondary air intake pipe and lower layer's secondary air intake pipe, which is characterized in that described Coal spout includes top coal spout and lower part coal spout, and the angle of the top coal spout and Y-axis is less than lower part coal spout and Y-axis Angle, lead to the entrance of the lower part coal spout for the outlet of the top coal spout, the setting of the entrance of the lower part coal spout In its side, the lower section of the lower part coal spout outlet is provided with coal breakage plate, along coal breakage direction, the top coal spout, under Portion's coal spout, the top of the entrance of coal breakage plate, top coal spout exit, which are respectively arranged with, send/coal spread wind mouth, is located on described The coal spread wind mouth in portion coal spout exit is disposed vertically downward；First air ignition air duct bottom be provided with First air into Air hose, the upper layer secondary air intake pipe and lower layer's secondary air intake pipe angle with horizontal plane be 27-33 °, First air with Secondary Air ratio is 45:55.

2. a kind of circulating fluidized bed boiler for using Indonesia coal according to claim 1, which is characterized in that the upper clan Angle between coal pipe and the adapter tube is 148-152 °, and the angle of the top coal spout and the lower part coal spout is 13- 17 °, the angle of the lower part coal spout and the coal breakage plate is 15 °, and the coal spread wind pipe is flattened rectangular pipe.

3. a kind of circulating fluidized bed boiler for using Indonesia coal according to claim 1, which is characterized in that the First air Ignition air duct is arranged side by side with 2-4, and the section of the First air ignition air duct becomes larger along First air air inlet wind direction, described The centerlines of the center line of primary air intake pipe and the First air ignition air duct are 30-45 °.

4. a kind of circulating fluidized bed boiler for using Indonesia coal according to claim 1, which is characterized in that the upper layer two Secondary wind blast pipe and lower layer's secondary air intake pipe are arranged independently of each other and inside is provided with control valve, the lower layer two It is 30%-35% that the air output of secondary wind blast pipe, which accounts for the total air output ratio of Secondary Air, and the upper layer secondary air intake pipe is apart from air distribution plate 4 Rice, lower layer's secondary air intake pipe is apart from 2 meters of air distribution plate.

5. a kind of circulating fluidized bed boiler for using Indonesia coal according to claim 1, which is characterized in that the whirlwind point There are two being arranged side by side from device, the cyclone separator includes separator inlet flue duct and separator body, the separator into Mouth flue is arranged at left and right sides of the top Hou Qiang of the burner hearth, and the separator inlet flue duct length is described more than or equal to 7 meters Angle is 174 ± 5 ° between separator inlet flue duct lateral wall and the side wall of the burner hearth, on the inside of the separator inlet flue duct Wall is two sections of folding faces, the angle of the folding face being connected with the burner hearth and the separator inlet flue duct lateral wall is 39 ± 5 °, another section of folding face and the angle of the separator inlet flue duct lateral wall are 10 ± 1 °.

6. a kind of circulating fluidized bed boiler for using Indonesia coal according to claim 1, which is characterized in that the returning charge system System includes U-shaped return box, and U-shaped return box one end connects the cyclone separator outlet at bottom by inlet connecting branch road, The U-shaped return box other end connects the burner hearth by outlet connecting pipe road, and the U-shaped return box includes top material returning device case With lower part returning charge bellows, the lower part returning charge bellows include the loosening air compartment sequentially arranged, flow air compartment and returning charge air compartment, described It loosens air compartment to be set to immediately below the cyclone separator outlet at bottom, the returning charge air compartment is arranged in close to the burner hearth one Side, it is described loosen air compartment, flowing air compartment, returning charge air compartment side wall be provided with air-vent and compressed air purging mouth, the loosening Air compartment, flowing air compartment, returning charge air compartment bottom be provided with ash port, the ash port bottom connects ash tube, and the top is returned It is provided with air distribution plate between glassware case and the lower part returning charge bellows, returning through the air distribution plate is installed on the air distribution plate Glassware blast cap.

7. a kind of circulating fluidized bed boiler for using Indonesia coal according to claim 6, which is characterized in that the outlet connects Adapter tube road end face is provided with lime stone import, and the lime stone import is continuously fed to agstone.