CN210069903U

CN210069903U - Smoke volume balancing device for two smoke extraction ports of boiler in single draught fan operation

Info

Publication number: CN210069903U
Application number: CN201920906606.XU
Authority: CN
Inventors: 王承亮
Original assignee: Huadian International Electric Power Co Ltd Technical Services Branch
Current assignee: Huadian International Electric Power Co Ltd Technical Services Branch
Priority date: 2019-06-17
Filing date: 2019-06-17
Publication date: 2020-02-14
Anticipated expiration: 2029-06-17

Abstract

The utility model discloses a logical cigarette volume balancing unit of two smoke extraction mouths of boiler when single draught fan operation, including two draught fans, electrostatic precipitator, air preheater and the heat exchanger that the boiler used, its characterized in that: a communicating flue is arranged between two electric dust removal flue gas pipelines which are connected with two induced draft fans and an electric dust remover; the flue gas pipeline after electric precipitation is provided with a pipeline inner cavity opening adjusting device. The utility model discloses when single draught fan operation, can adapt to the needs that thermal power generating unit carries out ultralow load operation stage to the operation of the highly effective district of serious deviation when avoiding two draught fans operation, draught fan power consumption risees, draught fan regulation linearity difference can't stably maintain boiler negative pressure operation and fan entering stall district operation etc. influence boiler operation safety's problem, can balance the logical cigarette volume of boiler both sides moreover, prevent that the cigarette temperature of two outlet flues of furnace from deviating, guarantee boiler safety and economy operation.

Description

Smoke volume balancing device for two smoke extraction ports of boiler in single draught fan operation

Technical Field

The utility model relates to a dynamic adjustment device of the logical cigarette volume of two smoking mouths when single draught fan of boiler low-load moves belongs to thermal power boiler technical field, and specifically speaking is a logical cigarette volume balancing unit of two smoking mouths of boiler when single draught fan moves, and it is the improvement through boiler draught fan operation pipeline to overcome the cigarette temperature deviation problem that two smoking mouths of furnace appear when single draught fan moves.

Background

With the continuous increase of the power market and the generated energy of new energy, in order to improve the flexibility of deep peak regulation operation of the thermal power generating unit as much as possible and reduce the phenomena of wind and light abandonment of new energy, the thermal power generating unit performs ultra-low load operation by gradually starting to implement deep peak regulation flexibility transformation from 2017. After the boiler is operated in deep peak shaving and low load, because the high-efficiency area of the induced draft fan is designed according to the conventional load of 80% of full load, and the design margin is large, when two induced draft fans positioned at two sides of the boiler A, B operate in low load (lower than 60% of full load), the opening degree of movable blades of the induced draft fan is lower than 20%, the movable blades are seriously deviated from the high-efficiency area to operate, the power consumption rate of the induced draft fan is increased, the negative pressure operation of the boiler cannot be stably maintained due to poor regulation linearity, the induced draft fan is easy to enter the stall area of the induced. At present, a relatively ideal method is that a single induced draft fan operates. As is well known to those skilled in the same technical field, outlets of two induced draft fans used by a boiler are respectively connected into corresponding desulfurizing towers, inlets of the two induced draft fans are communicated with a flue communicated with inlets of the induced draft fans, two inlets of the flue communicated with inlets of the induced draft fans are respectively correspondingly connected with an A-side flue gas outlet and a B-side flue gas outlet of an electric dust remover through an A-side dust removal flue and a B-side dust removal flue, an A-side flue gas inlet and a B-side flue gas inlet of the electric dust remover are respectively communicated with a corresponding A-side air preheater and a corresponding B-side air preheater, flue gas inlets of the A-side air preheater and the B-side air preheater are respectively communicated with flue gas outlets of a corresponding A-side heat exchanger and a corresponding B-side heat exchanger, a flue gas inlet of an A-side heat exchanger is connected into one side of a top high temperature zone in a boiler furnace, a flue gas inlet of a B-side heat, when the induced draft fan on the flue gas pipeline corresponding to the side A is started and the induced draft fan on the flue gas pipeline corresponding to the side B is closed, the operation of a single induced draft fan is realized, so that the problems that the operation of two induced draft fans deviates from the operation of a high-efficiency area seriously, the power consumption rate of the induced draft fans is increased, the negative pressure operation of a boiler cannot be stably maintained due to poor adjustment linearity of the induced draft fans, the operation of the draught fans entering a stall area is prevented, and the like, which influence the operation; the disadvantages are that: after a single induced draft fan operates, flue resistance and a flow field on two sides generate large difference, suction power on the operation side of the induced draft fan is relatively large, the flow field is optimized, smoke volume is obviously higher than that of a flue on the closing side of the induced draft fan, the difference of smoke volume directly influences combustion power fields on two sides of a hearth, the temperature of a hearth outlet corresponding to the operation side of the induced draft fan is indirectly higher than that of a hearth outlet corresponding to the stopping side of the induced draft fan, temperature deviation of a smoke outlet of the hearth is large, and the pipe wall of a heating surface in the hearth is over-heated; meanwhile, the normal operation of electric dust removal, air pre-heaters, coal economizers and other equipment arranged on the flues at the two sides can be influenced due to the large difference of the flue gas flow at the two sides.

Disclosure of Invention

An object of the utility model is to provide a when the single draught fan operation of boiler, stably maintain the normal negative pressure operation of boiler, make the logical cigarette volume keep balance of two smoke exhaust mouths of boiler, avoid the cigarette temperature of two smoke exhaust mouths to deviate, guarantee the logical cigarette volume balancing unit of two smoke exhaust mouths of boiler when the single draught fan operation of boiler safe operation.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the smoke volume balancing device for the two smoke extraction ports of the boiler during operation of the single draught fan comprises two draught fans, an electric dust remover, an air preheater and a heat exchanger, wherein the two draught fans are used by the boiler; an A-side flue gas input pipeline and a B-side flue gas input pipeline of the electric dust remover are respectively communicated with two sides of a high-temperature area at the top in a boiler hearth, and an air preheater and a heat exchanger are arranged on the A-side flue gas input pipeline and the B-side flue gas input pipeline; the method is characterized in that: a communicating flue is arranged between two electric dust removal flue gas pipelines which are connected with two induced draft fans and an electric dust remover; the flue gas pipeline after electric precipitation is provided with a pipeline inner cavity opening adjusting device.

Pipeline inner chamber aperture adjusting device, including rectangle baffle and square pipe, the tip of square pipe be equipped with the flue interface, a side of rectangle baffle is fixed and is equipped with fixed pivot, fixed bearing and the sealed bearing that is equipped with mutual symmetry on the relative lateral wall of square pipe's inner chamber, fixed miniature low-speed motor and limit switch of being equipped with on the outer wall of square pipe, the inner of fixed pivot is established in the bearing, the outer end of fixed pivot passes behind the lateral wall of sealed bearing and square pipe, with miniature low-speed motor's pivot fixed connection, the outer tip of fixed pivot is fixed and is equipped with the swinging arms, respectively be equipped with a limit switch in the top and the below of swinging arms, limit switch of below is located the position of rectangle baffle when perpendicular downwards, the limit switch of top is located the clockwise position that upwards rotates 45 degrees of rectangle baffle.

The rectangle baffle be equipped with threely, evenly distributed is in square pipe cavity, the length of rectangle baffle and the inner chamber width looks adaptation of square pipe, the width of rectangle baffle is 1/3 of the inner chamber width of square pipe, every rectangle baffle all have with the bearing of its adaptation, sealed bearing, miniature low-speed motor and limit switch.

The inlet end of the A side flue gas input pipeline is provided with an A side temperature probe, and the inlet end of the B side flue gas input pipeline is provided with a B side temperature probe.

The power line of the miniature low-speed motor is connected with a power switch of the controller in the control room; and the temperature probe at the side A and the temperature probe at the side B are both accessed to the control indoor controller through corresponding signal transmission cables.

The beneficial effects of the utility model reside in that: when a single draught fan operates, the system can adapt to the requirement of a thermal power generating unit in an ultra-low load operation stage, avoids the power consumption rate of the draught fan from rising, can balance the smoke passing amount of two sides of the boiler, prevents the smoke temperature of two smoke outlets of the hearth from deviating, ensures the safe and economic operation of the boiler, and has the advantages of simple structure, convenience in use, low investment and maintenance cost, energy conservation and environmental protection.

Drawings

Fig. 1 is a schematic top view of the structure of the present invention.

Fig. 2 is an enlarged schematic view of the present invention along the sectional structure a-a in fig. 1.

Fig. 3 is a schematic structural sectional view along B-B in fig. 2.

In the figure: 1. an induced draft fan; 2. outputting the smoke pipe after pressurization; 3. a flue gas pipeline after electric precipitation; 4. an electric dust collector; 5. the flue is communicated; 6. a side A flue gas input pipeline; 7. a B side flue gas input pipeline; 8. an air preheater; 9. a heat exchanger; 10. an opening adjusting device for the inner cavity of the pipeline; 101. a rectangular baffle plate; 102. a square tube; 103. fixing the rotating shaft; 104. a bearing; 105. sealing the bearing; 106. a miniature low speed motor; 107. a swing lever; 108. a limit switch; 109. a flue interface; 11. a side A temperature probe; 12. and a B side temperature probe.

Detailed Description

The present invention is manufactured with reference to fig. 1, 2, and 3. The smoke volume balancing device for the two smoke extraction ports of the boiler during operation of the single draught fan comprises two draught fans 1, an electric dust remover 4, an air preheater 8 and a heat exchanger 9, wherein the two draught fans 1 are used by the boiler, outlets of the two draught fans 1 are respectively provided with a pressurized output smoke pipe 2 connected to a corresponding desulfurizing tower, and inlets of the two draught fans 1 are respectively connected with a flue gas outlet after dust removal on the side A and a flue gas outlet after dust removal on the side B of the electric dust remover 4 through a flue gas pipeline 3 after electric dust removal; an A-side flue gas input pipeline 6 and a B-side flue gas input pipeline 7 of the electric dust collector 4 are respectively communicated with two sides of a top high-temperature area in a boiler furnace, an air preheater 8 and a heat exchanger 9 are arranged on the A-side flue gas input pipeline 6 and the B-side flue gas input pipeline 7, and the smoke extraction positions of two induced draft fans 1 correspond to two sides of the top high-temperature area in the boiler furnace; the method is characterized in that: a communicating flue 5 is arranged between two electric dust removal flue gas pipelines 3 connected with two induced draft fans 1 and an electric dust remover 4, and the flue gases at two sides can mutually circulate through the communicating flue 5; electric precipitation back flue gas pipeline 3 on be equipped with pipeline inner chamber aperture adjusting device 10, through the aperture of adjusting two pipeline inner chamber aperture adjusting device 10 to adjust the resistance that the flue gas flows through corresponding one side draught fan 1 behind the electric precipitation, if: when the induced draft fan 1 communicated with the flue gas outlet after dust removal of the side A of the electric dust remover 4 operates alone, the opening degree of the corresponding pipeline inner cavity opening degree adjusting device 10 is reduced, the flow resistance of the flue gas input pipeline 6 of the side A is increased, the suction amount of the flue gas at the high-temperature part of the boiler of the corresponding side is reduced, the flow speed is reduced, and the temperature is reduced; the opening of the pipeline inner cavity opening adjusting device 10 communicated with the flue gas outlet after the B side of the electric dust remover 4 is removed is adjusted to be in a maximum state, under the action of the draught fan 1 communicated with the flue gas outlet after the A side of the electric dust remover 4 is removed, the flue gas at the flue gas outlet after the B side of the electric dust remover 4 is removed is sucked into the draught fan 1 at the A side through the communicating flue 5, the flow of the flue gas at the B side is increased, so that the suction amount of the flue gas at the high-temperature part of the boiler at the corresponding side is increased, the flow is accelerated, the temperature is raised, the smoke through amount of two smoke outlets of the boiler is balanced finally, and the temperature difference at the high-temperature parts at; and vice versa.

The device 10 for adjusting the opening degree of the inner cavity of the pipeline comprises a rectangular baffle plate 101 and a square pipe 102, wherein a flue connector 109 is arranged at the end part of the square pipe 102, a fixed rotating shaft 103 is fixedly arranged at one side edge of the rectangular baffle plate 101, a bearing 104 and a sealing bearing 105 which are mutually symmetrical are fixedly arranged on the opposite side wall of the inner cavity of the square pipe 102, a micro low-speed motor 106 and a limit switch 108 are fixedly arranged on the outer wall of the square pipe 102, the inner end of the fixed rotating shaft 103 is arranged in the bearing 104, the outer end of the fixed rotating shaft 103 penetrates through the sealing bearing 105 and the side wall of the square pipe 102 and is fixedly connected with the rotating shaft of the micro low-speed motor 106, the rectangular baffle plate 101 is driven to slowly swing through the micro low-speed motor 106, a swing rod 107 is fixedly arranged at the outer end part of the fixed rotating shaft 103, a limit switch 108 is respectively arranged above and below the, the upper limit switch 108 is positioned at the position where the rectangular baffle 101 rotates clockwise and upwards by 45 degrees, so that when the micro low-speed motor 106 starts to rotate clockwise and rotates until the swinging rod 107 touches the upper limit switch 108, the micro low-speed motor 106 automatically stops and turns over a power supply electrode, the rectangular baffle 101 corresponding to the micro low-speed motor 106 rotates upwards by 45 degrees, the optimal rotating angle can be determined according to the temperature deviation of smoke at two sides, the inner cavity flue of the smoke pipeline 3 after electric precipitation is reduced, the resistance is increased, and the flow rate in the smoke pipeline 3 after electric precipitation is still maintained; when the power supply is started again, the miniature low-speed motor 106 rotates anticlockwise, the rectangular baffle 101 corresponding to the miniature low-speed motor 106 is turned downwards, when the miniature low-speed motor 106 rotates to the position that the swing rod 107 touches the limit switch 108 below, the miniature low-speed motor 106 is automatically stopped, the power supply electrode is turned over, at the moment, the rectangular baffle 101 is parallel to the flue gas pipeline 3 after electric precipitation, and the pipeline opening degree of the flue gas pipeline 3 after electric precipitation is the maximum.

The three rectangular baffles 101 are uniformly distributed in the cavity of the square pipe 102, the length of each rectangular baffle 101 is matched with the width of the cavity of the square pipe 102, the width of each rectangular baffle 101 is 1/3 of the width of the cavity of the square pipe 102, and each rectangular baffle 101 is provided with a bearing 104, a sealing bearing 105, a micro low-speed motor 106 and a limit switch 108 which are matched with the rectangular baffle 101.

The inlet end of the A side flue gas input pipeline 6 is provided with an A side temperature probe 11, and the inlet end of the B side flue gas input pipeline 7 is provided with a B side temperature probe 12 for measuring the temperature of two sides of a high-temperature area at the top of a boiler furnace.

The power line of the miniature low-speed motor 106 is connected with a power switch of a controller in the control room; temperature probe 11 of side A and temperature probe 12 of side B all insert the control room controller through corresponding signal transmission cable, through the temperature difference of controller demonstration side A and side B, operating personnel according to the temperature difference size, confirm which miniature low-speed motor 106 or several miniature low-speed motor 106 of start, confirm the inner chamber aperture of suitable electric precipitation back flue gas pipeline 3.

The induced draft fan 1, the miniature low-speed motor 106, the electric dust collector 4, the air preheater 8 and the heat exchanger 9 are all existing equipment, so that the number is not more.

Claims

1. The smoke volume balancing device for the two smoke extraction ports of the boiler during operation of the single draught fan comprises two draught fans (1), an electric dust remover (4), an air preheater (8) and a heat exchanger (9), wherein the two draught fans (1) are used by the boiler, outlets of the two draught fans (1) are respectively provided with a pressurized output smoke pipe (2) connected to a corresponding desulfurizing tower, and inlets of the two draught fans (1) are respectively connected with a flue gas outlet after dust removal on the side A and a flue gas outlet after dust removal on the side B of the electric dust remover (4) through a flue gas pipeline (3) after electric dust removal; an A-side flue gas input pipeline (6) and a B-side flue gas input pipeline (7) of the electric dust collector (4) are respectively communicated with two sides of a high-temperature area at the top in a boiler hearth, and an air preheater (8) and a heat exchanger (9) are arranged on the A-side flue gas input pipeline (6) and the B-side flue gas input pipeline (7); the method is characterized in that: a communicating flue (5) is arranged between two electric dust removal flue gas pipelines (3) which are connected with two induced draft fans (1) and an electric dust remover (4); the flue gas pipeline (3) after electric precipitation is provided with a pipeline inner cavity opening degree adjusting device (10);

the device (10) for adjusting the opening of the inner cavity of the pipeline comprises a rectangular baffle plate (101) and a square pipe (102), wherein a flue connector (109) is arranged at the end part of the square pipe (102), a fixed rotating shaft (103) is fixedly arranged at one side edge of the rectangular baffle plate (101), bearings (104) and sealing bearings (105) which are mutually symmetrical are fixedly arranged on the opposite side wall of the inner cavity of the square pipe (102), a miniature low-speed motor (106) and a limit switch (108) are fixedly arranged on the outer wall of the square pipe (102), the inner end of the fixed rotating shaft (103) is arranged in the bearing (104), the outer end of the fixed rotating shaft (103) penetrates through the sealing bearings (105) and the side wall of the square pipe (102) and then is fixedly connected with the rotating shaft of the miniature low-speed motor (106), a swinging rod (107) is fixedly arranged at the outer end part of the fixed rotating shaft (103), and limit switches (108) are respectively arranged above and, the lower limit switch (108) is positioned at the position when the rectangular baffle plate (101) is vertically downward, and the upper limit switch (108) is positioned at the position when the rectangular baffle plate 101 rotates clockwise upward by 45 degrees.

2. The smoke throughput balancing device for the two smoke extraction ports of the boiler in the operation of the single induced draft fan according to claim 1, wherein: the three rectangular baffles (101) are uniformly distributed in the cavity of the square pipe (102), the length of each rectangular baffle (101) is matched with the width of the inner cavity of the square pipe (102), and the width of each rectangular baffle (101) is 1/3 of the width of the inner cavity of the square pipe (102).

3. The smoke throughput balancing device for the two smoke extraction ports of the boiler in the operation of the single induced draft fan according to claim 1, wherein: the inlet end of the A-side flue gas input pipeline (6) is provided with an A-side temperature probe (11), and the inlet end of the B-side flue gas input pipeline (7) is provided with a B-side temperature probe (12).