CN208504379U - A kind of adjustable straight-through pulverized coal burner of flow area - Google Patents

Abstract

The utility model belongs to coal powder burning technology field, in particular to a kind of adjustable straight-through pulverized coal burner of flow area, solving coal fired boiler of power plant not can guarantee in underload, stablize burning and the generation of low pollution object in ultra-low load environment, the problem of being easy to cause water wall high temperature corrosion simultaneously, burner inlet is connected with elbow, elbow is connected with burner body, it is horizontally disposed inside burner body to have back-fire side demarcation plate, to fiery side demarcation plate and divider passages baffle, and burner body internal cavity is divided into divider passages M, divider passages Z and divider passages H.If burner is separated into dry passage using demarcation plate by the utility model, adjust burner divider passages input quantity and burner flow area, and with combined burner put into operation the number of plies adapt to boiler load, many outstanding problems such as low-load combustion-stabilizing existing for current station boiler can be effectively solved, suit large area to popularize use.

Description

A kind of adjustable straight-through pulverized coal burner of flow area

Technical field

The utility model belongs to coal powder burning technology field, in particular to a kind of adjustable direct-flow pulverized coal combustion of flow area Device.

Background technique

Straight-through pulverized coal burner, one layer of four coal burner of each coal pulverizer band are widely used in coal fired boiler of power plant Quadrangle cuts garden mode and burns in burner hearth, when load variations, runs number of plies adjustment by exiting or increase burner and adapts to pot Furnace load, with China's energy resource structure profound change, this regulative mode be difficult adapt to boiler flexibly run, the need of depth peak regulation It wants, so that coal fired boiler of power plant not can guarantee stablizes burning and the life of low pollution object in underload, ultra-low load environment At, while it being easy to cause water wall high temperature corrosion, problem above is the current protrusion problem for restricting the development of China's station boiler.

Utility model content

The utility model not can guarantee the stable combustion in underload, ultra-low load environment to solve coal fired boiler of power plant It burns and the generation of low pollution object, while the problem of be easy to cause water wall high temperature corrosion, it is adjustable to provide a kind of flow area Straight-through pulverized coal burner.

The utility model is achieved by the following technical solution: a kind of adjustable straight-through pulverized coal burner of flow area, Burner inlet is connected with elbow, and elbow is connected with burner body, and burner body inside is horizontally disposed back fire Side demarcation plate and that one end close to elbow is provided with separation to fiery side demarcation plate, back-fire side demarcation plate and to fiery side demarcation plate is logical Burner body internal cavity is divided into separating and be led to by road baffle, back-fire side demarcation plate to fiery side demarcation plate and divider passages baffle Road M, divider passages Z and divider passages H, ventilation hole is provided on back-fire side demarcation plate, and one end of divider passages baffle passes through burning Device main body is simultaneously provided with dynamic and static sealing device between the shell of burner body, and divider passages baffle, which is connected with, can be such that it does to stretch The baffle executing agency of contracting movement, baffle executing agency are connected with actuating mechanism controls case, pass through the flexible of divider passages baffle Movement adjustment burner flow area, divider passages H are dense phase pulverized coal, the outlet area of divider passages Z in burner nozzle position The dilute phase coal dust or air of domain for the benefit of high temperature gases recirculating, the exit region of divider passages M are to avoid water-cooling wall high temperature rotten The air of erosion, the back-fire side shell of burner body are provided with air supply line, and burner is equipped with steady combustion tooth to fiery side spout.

The stroke range of divider passages baffle is burner body back-fire side shell to between fiery side demarcation plate, separates and leads to Road baffle is 0 ° < R≤90 ° with back-fire side demarcation plate, to the angular range value of fiery side demarcation plate.

Back-fire side demarcation plate is installed with expansion clearance between fiery side demarcation plate and the shell of burner body respectively.

Air supply line is connected with primary air fan or secondary air fan, and the adjusting for Boiler pressure control is provided on air supply line Valve.

The motion range of divider passages baffle is back-fire side burner body shell to between fiery side demarcation plate.

The coal dust of the elbow section of burner inlet is blown into speed greater than critical coal dust sinking speed.

The utility model is divided burner body using horizontally arranged back-fire side demarcation plate and to fiery side demarcation plate At 3 divider passages, under the premise of guaranteeing that the coal dust for entering burner body does not deposit, hidden using divider passages baffle is flexible Back-fire side demarcation plate and the folding area to fiery side demarcation plate are kept off, it is covert to adjust to reach the function of adjusting burner flow area The investment power of whole burner so that in boiler coal dust firing can flexible modulation, adapt to depth peak regulation requirement.

The utility model coal burner to fiery side divider passages H be dense phase pulverized coal, the outlet of back-fire side divider passages M Region is pure air or oxygen-enriched air, and the exit region pressure of intermediate divider passages Z is lower, is conducive to high temperature gases recirculating, real Showed thick coal culm air-flow has upstream thermal-flame to light to fiery side, and the other side has high temperature reflux flue gas to support burning, to reach The purpose of coal dust stable ignition burning, facilitates steady combustion of the coal fired boiler of power plant under underload, ultra-low load.Wherein, it fires Burner back-fire side divider passages put into air, and making boiler water wall, nearby oxygen concentration increases, and avoid water wall high temperature corrosion.

By adjusting the travel position of divider passages baffle, the contract fully or half that intermediate divider passages may be implemented are closed It closes, and then adjusts the through-current capacity of coal dust in intermediate divider passages, so that the distribution of burner hearth horizontal direction coal powder density reaches reasonable value.

Design has ventilation hole on back-fire side demarcation plate, on the one hand ventilation hole can cool down burner nozzle, avoids it By high temperature scaling loss, horizontal direction burner nozzle recirculating zone size in burner hearth is on the other hand adjusted；Back-fire side divider passages M is set It is equipped with air supply line and regulating valve, can adjust the flow and pressure for entering air in back-fire side divider passages M by regulating valve, And burner nozzle has steady combustion tooth to the design of fiery side；Dynamic and static sealing device is used between divider passages baffle and burner housing, Connection executing agency and actuating mechanism controls case on the outside of divider passages baffle, so that the stretching motion of divider passages baffle can hand Dynamic operation, can also remotely operate.

The utility model simple structure and reasonable design is cut the above-mentioned outstanding problem of garden combusting coal fines boiler for power station and is set Flow area adjustable burner has been counted, it is entirely different with other burners in principle, structure, the method for operation.Burner benefit Burner internal is divided into 2~4 divider passages with demarcation plate, burner divider passages input quantity is adjusted and burner is logical Flow area, and boiler load is adapted to the combined burner number of plies that puts into operation, it can effectively solve low negative existing for current station boiler Lotus such as surely fires at many outstanding problems；Meanwhile the utility model has low cost, easy to operate, high reliablity, practical etc. are all More advantages, suit large area to popularize use.

Detailed description of the invention

Fig. 1 is the external structure schematic diagram of the utility model straight-through pulverized coal burner；

Fig. 2 is the structural schematic diagram of N-N section in Fig. 1；

Fig. 3 is the structural representation side view of straight-through pulverized coal burner spout in Fig. 1.

In figure: 1- elbow, 2- divider passages baffle, 3- back-fire side demarcation plate, 4- is to fiery side demarcation plate, 5- burner master Body, 6- surely fire tooth, 7- baffle executing agency, 8- dynamic and static sealing device, 9- actuating mechanism controls case, 10- regulating valve, 11- air feed Pipeline, 12- ventilation hole, 13- inlet elbow vertical section, the expansion clearance 17-, 18- divider passages M, 19- divider passages Z, 20- point Every channel H.

Specific embodiment

The utility model includes burner housing main body 5, the horizontally disposed back-fire side of streamwise separates in burner Plate 3 and to fiery side demarcation plate 4, divider passages baffle 2, divider passages baffle 2 and burner housing use static and dynamic sealing, furthermore this Utility model further comprises baffle executing agency 7, actuating mechanism controls case 9, air supply line 11 and regulating valve 10, is located at burner Main body 5 exports the steady combustion tooth 6 to fiery side.The elbow 1 of burner inlet end and primary wind pipe is welded to connect, burner internal coal Powder channel can be divided into 2~4 breeze airflow channels according to corresponding coal pulverizer and boiler parameter, and the utility model is illustrated as 3 divider passages, burner demarcation plate and burner body shell are welded or are cast and connect, the gear of divider passages entry position Plate oblique cutting enters divider passages arrival end, and angular range value is 0 ° < R≤90 °.Divider passages baffle 2 is set with 5 shell of burner body In respect of dynamic and static sealing device 8, dynamic and static sealing device 8 is connected with baffle executing agency 7 and can make to separate by baffle executing agency 7 The free movement in stroke range of channel blind 2, stroke range are that the motion range of divider passages baffle 2 is back-fire side burning 5 shell of device main body is to between fiery side demarcation plate 4.Air supply line 11 and regulating valve are provided in burner back-fire side divider passages 10, ventilation hole 12 is set on back-fire side demarcation plate 3, and the position of opening and perforated area size of ventilation hole 12 are according to concrete model Boiler-burner parameter determines.Wherein, in the air supply line 11 of burner body 5 wind quoted from First air or Secondary Air；Burning Device forms recirculating zone in intermediate divider passages nozzle area, so that high temperature gases recirculating, conducive to firing coal-dust is stablized；Burner master The nozzle area of body 5 forms classification of the breeze airflow from dense to dilute in the horizontal direction, to fiery side to back-fire side；When burner is logical When flow area standard-sized sheet, performance is consistent with original burner.

Specifically, the utility model is further elaborated in referring to Fig.1~Fig. 3, a kind of adjustable direct current of flow area Coal burner, burner inlet are connected with elbow 1, and elbow 1 is connected with burner body 5, along level inside burner body 5 Direction is provided with back-fire side demarcation plate 3 and to fiery side demarcation plate 4, back-fire side demarcation plate 3 and to fiery side demarcation plate 4 close to elbow 1 one end is provided with divider passages baffle 2, back-fire side demarcation plate, to fiery side demarcation plate 4 and divider passages baffle 2 by burner Body interior cavity is divided into divider passages M18, divider passages Z19 and divider passages H20, is provided with ventilation on back-fire side demarcation plate 3 Hole 12, one end of divider passages baffle 2 pass through burner body 5 and are provided with static and dynamic sealing between the shell of burner body 5 Device 8, divider passages baffle 2 are connected with the baffle executing agency 7 that it can be made to do stretching motion, and baffle executing agency 7 connects There is actuating mechanism controls case 9, burner flow area is adjusted by the stretching motion of divider passages baffle 2, divider passages H20 exists Burner nozzle position be dense phase pulverized coal, the exit region of divider passages Z19 for the benefit of the dilute phase coal dust of high temperature gases recirculating or Person's air, the exit region of divider passages M18 are the air for avoiding water wall high temperature corrosion, outside the back-fire side of burner body 5 Shell is provided with air supply line 11, and burner is equipped with steady combustion tooth 06 to fiery side spout.

Back-fire side demarcation plate 3 is installed with expansion clearance 17 between fiery side demarcation plate 4 and the shell of burner body 5 respectively. 1 section of elbow of burner inlet is blown into speed greater than critical coal dust sinking speed.

No matter burner internal described in the utility model by baffle is divided into three or four channels, only to fiery side No setting is required on demarcation plate ventilation hole 12.

Garden burning boiler coal burner is cut using a kind of adjustable direct current coal of flow area of the utility model in power station quadrangle After powder burner, flexible modulation may be implemented within the scope of full load.The burner flow area when burner oepration at full load Standard-sized sheet, it is consistent with the conventional burners method of operation, and the air capacity due to increasing back-fire side divider passages M 18, improve burning Device exports back-fire side water cooling wall region oxygen concentration, it is possible to prevente effectively from high temperature corrosion；When burner is in underload, ultra-low load shape When being run under state, divider passages switch, half-open, closure are adjusted by baffle stretching motion, adjust the coal dust for entering divider passages Air flow rate, when half-open, a small amount of dilute phase coal dust enters divider passages under the effect of elbow centrifugal force, cooperates back-fire side air stream Amount makes the exit of divider passages Z19 among burner form low-pressure area recirculating zone, is thick coal culm to fiery side divider passages H20 Area, back-fire side divider passages M18 are air zone, realize lateral fuel and combustion process classification；There is upstream height in thick coal culm windward side Warm flame ignition, thick coal culm back side have high temperature gases recirculating to light, and guarantee stable ignition and the burning of a small amount of coal dust；Intermediate reflux Area's high-temperature flue gas that should flow back avoids scaling loss nozzle again；Back-fire side air guarantees that water-cooling wall avoids high temperature corrosion.This is practical new Type realizes fuel and combustion process classification in the horizontal direction, extends the time of anoxycausis, greatly reduces oxynitrides Discharge.

It is that the utility model burner is suitable for having been put into operation and just cut garden burning boiler in the power station of installation and debugging, Have many advantages, such as that structure is simple, runs simple, easy to maintain and economy, there is extensive Social benefit and economic benefit, It is equally applicable to the transformation of old boiler simultaneously.

Claims (6)

1. a kind of adjustable straight-through pulverized coal burner of flow area, it is characterised in that: burner inlet is connected with elbow (1), curved Head (1) is connected with burner body (5), burner body (5) it is internal it is horizontally disposed have back-fire side demarcation plate (3) and to Fiery side demarcation plate (4), back-fire side demarcation plate (3) and that one end close to elbow (1) is provided with separation to fiery side demarcation plate (4) is logical Road baffle (2), back-fire side demarcation plate divide burner body internal cavity to fiery side demarcation plate (4) and divider passages baffle (2) At divider passages M(18), divider passages Z(19) and divider passages H(20), ventilation hole (12) are provided on back-fire side demarcation plate (3), One end of divider passages baffle (2) passes through burner body (5) and is provided with static and dynamic sealing between the shell of burner body (5) Device (8), divider passages baffle (2) are connected with the baffle executing agency (7) that it can be made to do stretching motion, baffle executing agency (7) actuating mechanism controls case (9) are connected with, burner flow area is adjusted by the stretching motion of divider passages baffle (2), point Every channel H(20) burner nozzle position be dense phase pulverized coal, divider passages Z(19) exit region for the benefit of high-temperature flue gas return The dilute phase coal dust or air of stream, divider passages M(18) exit region be the air for avoiding water wall high temperature corrosion, burner The back-fire side shell of main body (5) is provided with air supply line (11), and burner is equipped with steady combustion tooth (06) to fiery side spout.

2. the adjustable straight-through pulverized coal burner of a kind of flow area according to claim 1, it is characterised in that: divider passages The stroke range of baffle (2) is burner body (5) back-fire side shell to between fiery side demarcation plate (4), divider passages baffle It (2) is 0 ° < R≤90 ° with back-fire side demarcation plate (3), to the angular range value of fiery side demarcation plate (4).

3. the adjustable straight-through pulverized coal burner of a kind of flow area according to claim 2, it is characterised in that: back-fire side point Partition (3) is installed with expansion clearance (17) between fiery side demarcation plate (4) and the shell of burner body (5) respectively.

4. the adjustable straight-through pulverized coal burner of a kind of flow area according to claim 1, it is characterised in that: air supply line (11) it is connected with primary air fan or secondary air fan, the regulating valve (10) for Boiler pressure control is provided on air supply line (11).

5. the adjustable straight-through pulverized coal burner of a kind of flow area according to claim 1 or 2, it is characterised in that: separate The motion range of channel blind (2) is back-fire side burner body (5) shell to between fiery side demarcation plate (4).

6. the adjustable straight-through pulverized coal burner of a kind of flow area according to claim 1, it is characterised in that: burner The coal dust of elbow (1) section of entrance is blown into speed greater than critical coal dust sinking speed.