CN215247801U - Coal blending system for rapidly switching coal types between coal bunkers - Google Patents
Coal blending system for rapidly switching coal types between coal bunkers Download PDFInfo
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- CN215247801U CN215247801U CN202023281150.4U CN202023281150U CN215247801U CN 215247801 U CN215247801 U CN 215247801U CN 202023281150 U CN202023281150 U CN 202023281150U CN 215247801 U CN215247801 U CN 215247801U
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Abstract
The utility model relates to a thermal power factory coal kind blending coal mixes burns technical field, more specifically relates to a coal bunker bay coal kind fast switch-over blending system. A fully-closed bidirectional belt type conveyor arranged horizontally is arranged in the middle of the coal bunkers arranged side by side and contains a weighing module and a metering module; the two coal feeders are arranged on the side walls of the two raw coal bins respectively, the two coal feeders are arranged on the side walls of the two raw coal bins, the two coal feeders are connected with the coal inlet of the totally-enclosed two-way belt conveyor, the outlet pipelines of the two-way belt conveyor are communicated with the upper area of the outlet sides of the two coal feeders, and the normal conveying function of the coal feeders is not influenced. The utility model has the advantages that: the improved coal type matching machine has the advantages of simple transformation scheme, high reliability, less investment, huge benefit generation, quick coal type switching and accurate coal type matching, quick response, convenience in installation and maintenance, flexibility in operation, low failure rate and the like.
Description
Technical Field
The utility model relates to a coal blending technical field of coal bunker of thermal power plant, more specifically relates to a coal kind fast switch-over coal blending system between coal bunker.
Background
The electric power market is characterized by strong real-time performance, particularly along with the development of the spot market, the difficulty that a power plant must face is how to respond to external real-time load change under the condition of reducing the power generation cost, and the multiple peak power generation and the reduction of load limitation examination are also important profit growth points.
With the continuous upgrading and improvement of the energy-saving technology of the thermodynamic system, the energy-saving space deeply excavated on equipment is less and less, the investment is extremely large, the cost of fuel in a thermal power plant is close to 70%, and the search for new profit breakthrough points on the fuel is a great trend and large space, which is an important problem for cost reduction and efficiency improvement of the coal-fired power plant and even a key for determining the survival and death of the power plant. The main factors influencing the price of the fuel are the calorific value of the fuel and the sulfur content. Therefore, the reduction of fuel cost in coal-fired thermal power plants mainly reduces the calorific value of purchased fuel and improves the sulfur content of the fuel.
The continuous reduction of the heat value of the fuel fed into the boiler of the power plant causes the load carrying capacity of the unit to be reduced, the powder making system loses standby equipment and even cannot meet the dispatching requirement of a power grid, so that the income of the thermal power plant is reduced, the output is limited to be checked, the profit of the power plant is reduced, and the image of the power plant is damaged.
The increase of the sulfur content of the fuel exceeds the disposal capability of environmental protection equipment of a power plant, and the environmental protection index exceeds the standard, so that the benefits of the power plant and the society are damaged. The middle buffering function of the coal bunker of the coal pulverizing system causes that the fuel adjustment can not meet the real-time change requirement of the load. The design capacity specification of the coal bunker is to meet the 10-hour consumption of the unit. Even if the operating personnel operate at the low coal level of 150-300 tons by controlling part of coal bunkers so as to adjust the coal blending in time according to the load change and meet the load requirement, the replacement of the coal stored in the coal bunkers can be basically adjusted in place within more than 4 hours each time, the real-time change requirement and the environmental protection requirement of the load are difficult to meet, and the operation safety, the environmental protection and the economy are also reduced.
The power plant has to face the dilemma of responding to the external real-time load change under the condition of reducing the power generation cost; at present, seawater is mainly adopted for desulfurization treatment, the process has weak desulfurization capacity and high sulfur sensitivity, the sulfur content exceeds the limit, no effective and rapid adjustment means is provided except that the load is greatly reduced, and the environmental protection index control pressure is extremely high; the design capacity of the existing coal bunker is 660 tons, the consumption of 10 hours is met, but the replacement of coal stored in the coal bunker in each time can be basically adjusted in place within more than 4 hours, the real-time change requirement and the environmental protection requirement of the load are difficult to meet, and the operation safety, the environmental protection property and the economical efficiency are reduced.
Based on the above points, a flexible coal blending means is urgently needed by a coal-fired thermal power plant to rapidly change the current situation of severe mismatch between the inherent large cache change characteristic of fuel blending and the real-time change characteristic of external load.
Disclosure of Invention
An object of the utility model is to provide a thinking is reformed transform to coal blending flexibility, eliminates the very big buffer memory characteristic of powder process system coal bunker for fuel system zero time lag response load demand, but furthest has utilized equipment characteristic, and furthest's joining in marriage burns economic coal type, can create the coal type fast switch-over coal blending system between coal bunker of very big economic benefits for the power plant.
In order to solve the technical problem, the utility model discloses a technical scheme is:
a coal type fast switching coal blending system between coal bunkers comprises the coal bunkers arranged side by side, a fully-closed bidirectional belt conveyor arranged horizontally is arranged between the coal bunkers, a metering module is arranged in the fully-closed bidirectional belt conveyor, a coal inlet and a coal conveying port are arranged at two ends of the fully-closed bidirectional belt conveyor, downward connecting pipes are arranged on the side walls of the bottoms of the two coal bunkers, the bottom end of each connecting pipe is connected with the coal inlet of the fully-closed bidirectional belt conveyor, a first gate plate door is arranged in the middle of each connecting pipe, a coal outlet at the bottom of each coal bunker is connected with a coal feeder inlet pipeline, a second gate plate door is arranged in the middle of each coal feeder inlet pipeline, an output coal port of the fully-closed bidirectional belt conveyor is connected with the tail of the coal feeder and is arranged on the upper portion of a coal feeder discharge port, a third gate plate door is arranged in a shell area from the outlet of the fully-closed bidirectional belt conveyor to the upper portion of the tail of the coal feeder, and a discharge port of the coal feeder is connected to a coal mill through a coal dropping pipe, and a fourth flashboard door is arranged in the middle of the coal dropping pipe.
Preferably, the upper part of the feeder discharge port shell is provided with a feed feeder distribution baffle groove to ensure that the coal flow coming from the new conveyor does not collide with the belt of the existing feeder, is independent of each other, and has the function of keeping the two coal flows independent of each other and not colliding when in simultaneous operation.
Preferably, the first gate plate door, the second gate plate door, the third gate plate door and the fourth gate plate door are pneumatic or hydraulic double gate plate doors, so that coal flow, sealing air and hot primary air of each coal feeder are cut off and communicated in real time, mutually independent operation and parallel operation of 6 coal feeders and 6 coal mills are ensured when the unit operates normally, and the functions of ensuring convenience in maintenance and ensuring safety of human bodies and equipment are also realized.
Preferably, the connecting pipe and the outlet pipe section of the bidirectional belt conveyor are provided with rappers, so that the situation that the pipeline is blocked due to the blockage of the coal blocks can be prevented.
Preferably, the totally-enclosed bidirectional belt conveyor adopts a closed positive-pressure square shell, and two sides of the totally-enclosed bidirectional belt conveyor are provided with observation holes. Preferably, a scraper type cleaning device is arranged at the bottom of the totally-enclosed bidirectional belt conveyor. Preferably, a cleaning brush is arranged on an observation hole of the totally-enclosed bidirectional belt conveyor. By adopting the technical scheme, coal leakage and coal accumulation can be reduced to the maximum extent, and a small amount of scattered coal dust can be conveniently cleaned and the operation condition of equipment can be observed.
Preferably, the coal type fast switching coal blending system between the coal bunkers is controlled by PLC logic and is communicated with the existing coal feeding and combustion control system and is protected in an interlocking mode.
Preferably, the totally-enclosed bidirectional belt conveyor controls forward and reverse rotation and rotation speed through connection of a variable-frequency driving motor, and realizes the functions of supplying two coal feeders to one coal bunker simultaneously or supplying adjacent coal feeders to the coal bunker independently and performing subsequent blending adjustment and coal blending by matching with control opening and closing of each pneumatic double-gate plate door.
Compared with the prior art, the beneficial effects of the utility model are that:
1. aiming at a unit with deep peak regulation requirement, common coal quality, high volatile component and high heat value peak regulation coal are respectively stored in a dual-fuel coal bunker. When the load is normal, the flashboard door at the peak-shaving coal side is closed, the flashboard door of the common coal quality is opened, the common coal quality is combusted, and the fuel cost is reduced; when deep peak regulation is needed, the inserting plate door on the peak regulation coal quality side is opened, the inserting plate door of the common coal quality is closed, the peak regulation coal quality is combusted, and the low-load stable combustion capacity of the boiler is improved.
2. The utility model discloses a transformation scheme is simple, reliable, and the earlier stage drops into fewly, and it is huge to produce the benefit, calculates according to power plant unit year operation 7000 hours, and two tunnel bunker junctor are reformed transform to every unit, realize between the B/C bunker and between the E/F bunker altogether 4 bunkers in the excellent, the real-time fast switch-over of fuel of being poor mix join in marriage, expect about 2045.66 ten thousand yuan of new incremental benefit of every unit of reforming transform year.
3. The utility model provides a current reduction for satisfying loaded curve go on in advance between the loaded down with trivial details communication coordination work, the trouble problem of dispatch, through the utility model discloses can realize adjusting the distribution coal volume of each coal bunker of rational distribution fast directly by operating personnel according to the actual production demand in scene to reach the purpose that produces the output of optimal productivity through minimum coal consumption, improve production efficiency greatly.
4. The utility model discloses can be real-time, quick response require because of the coal type demand that the load curve change leads to, eliminate because of the coal bunker deposits the coal replacement and need wait for at least 4 hours the time, the most economic coal type of maximum burning improves economic benefits.
5. The utility model discloses a totally closed two-way belt conveyor and the cooperation of feeder, join in marriage the different coal types of burning, the realization stove that can be better is interior to burn thoughtlessly, reduces the interior thermal load of stove inhomogeneous, the pipe wall slagging scorification, the super temperature scheduling problem of wall temperature, improves boiler efficiency, equipment security.
6. The utility model discloses be equipped with metering module in the closed two-way belt conveyor who adopts, have controllable weighing measurement function, guarantee the precision that the coal blending was weighed, can realize the two-way transport function of coal charge, also can realize that two coal bunkers send the coal function to the coal blending proportion of same coal pulverizer as the demand.
7. The utility model discloses a but the integral erection, it is assembled according to hoist and mount condition branch two sections scene to do, and installation convenient operation is nimble.
8. The utility model discloses the two-way belt conveyor of sealing who chooses for use adopts belt measurement batcher, and through measuring weight, bed of material height and control area are fast, and feed stability is high, and later maintenance, maintenance work are simple relatively, and main maintenance part is belt and chain, and it is convenient to maintain, and the maintenance cost is low, and operating power is low, and the fault rate is low, has reduced manufacturing cost widely.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic side view of the present invention.
The graphic symbols are illustrated as follows:
1-coal bunker, 2-totally-enclosed bidirectional belt conveyor, 3-coal feeder, 4-connecting pipe, 5-first gate plate door, 7-second gate plate door, 9-third gate plate door, 11-fourth gate plate door, 13-coal feeder inlet pipe section, 14-coal dropping pipe, 15-coal feeder distributing baffle groove
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
To further clarify the objects, features and functions of the present invention, a review board will be described in connection with the following detailed description of the preferred embodiments of the invention:
referring to fig. 1-2, for the structural schematic view of the present invention, the present invention is a coal type fast switching coal blending system between coal bunkers, comprising coal bunkers 1 arranged side by side, a fully-enclosed bidirectional belt conveyor 2 horizontally arranged between the coal bunkers 1, a metering module arranged in the fully-enclosed bidirectional belt conveyor 2, a coal inlet and a coal conveying port arranged at both ends of the fully-enclosed bidirectional belt conveyor 2, a downward connecting pipe 4 arranged on the sidewall of the bottom of the coal bunker 1, a coal inlet pipe section connected to the bottom of the connecting pipe 4, a first gate plate door 5 arranged in the middle of the connecting pipe 4, a coal outlet at the bottom of the coal bunker 1 connected to a coal feeder inlet pipe 13, a second gate plate door 7 arranged in the middle of the coal feeder inlet pipe 13, a coal conveying port of the fully-enclosed bidirectional belt conveyor 2 connected to the upper portion of the tail of the coal feeder 3, and a third gate plate door 9 is arranged, and a fourth gate plate door 11 is arranged in the middle of the coal feeder outlet coal dropping pipe 14.
Preferably, the upper part of the discharge casing of the coal feeder 3 is provided with a coal feeder distributing baffle groove 15 to ensure that the coal flow from the new conveyor does not collide with the belt of the existing coal feeder, is independent of the existing belt of the coal feeder, and has the function of simultaneous operation if necessary.
Preferably, the first gate plate door 5, the second gate plate door 7, the third gate plate door 9 and the fourth gate plate door 11 are pneumatic or hydraulic double gate plate doors, so that real-time control is realized, normal operation of a unit is ensured, and when maintenance and isolation of each coal pulverizer are ensured, a pneumatic gate plate at an outlet of a corresponding coal feeder connecting pipe 4 is closed, sealing air and primary air of the coal feeder in operation are ensured not to be mixed with the stopped coal feeder, and personal and equipment safety is ensured.
Preferably, the communication pipe 4 is provided with a vibrator, so that the situation that the pipeline is blocked due to the blockage of the coal blocks can be prevented.
Preferably, the totally-enclosed bidirectional belt conveyor 2 adopts a closed square shell, and two sides of the shell are provided with observation holes.
Preferably, the bottom of the totally-enclosed bidirectional belt conveyor 2 is provided with a scraper type cleaning device.
Preferably, a cleaning brush is arranged on the observation hole of the totally-enclosed bidirectional belt conveyor 2.
By adopting the technical scheme, coal leakage and coal accumulation can be reduced to the maximum extent, and a small amount of scattered coal dust can be cleaned conveniently.
Preferably, the coal type fast switching coal blending system between the coal bunkers is controlled by PLC logic and is communicated with the existing coal feeding and combustion control system and is protected in an interlocking mode.
Preferably, the totally-enclosed bidirectional belt conveyor 2 is connected with a driving motor to control forward and reverse rotation, so that the functions of supplying two coal feeders to one coal bunker simultaneously or supplying adjacent coal feeders to the coal bunker independently and adjusting coal blending subsequently are realized.
The first embodiment: when the mixed coal blending treatment is needed, a first gate plate door 5 below a connecting pipe 4 of a coal bunker 1 on one side is opened, coal materials in the coal bunker 1 enter a fully-closed bidirectional belt conveyor 2 through the connecting pipe 4, a driving motor controls the fully-closed bidirectional belt conveyor 2 to directionally run and weigh, the coal materials on the inner belt of the fully-closed bidirectional belt conveyor 2 are conveyed to a coal feeder 3 connected with the coal bunker 1 on the other side according to a proportion, meanwhile, a second gate plate door 9 at the lower end of the coal bunker 1 on the other side is opened, the coal materials enter the coal feeder 3 through a third gate plate door 9, finally, the coal materials are mixed with coal flow on a belt of the coal feeder and fall into a coal dropping pipe 14 at the upper part of a coal mill, the coal mill is subjected to mixing and milling to realize mixed coal blending treatment, and the purpose of proportional mixing is achieved.
Second embodiment: when coal needs to be separately mixed to adjacent coal feeders, the embodiment is similar to the embodiment 1, except that the second gate plate door 7 at the lower end of the coal bunker 1 at one side of the embodiment is closed, coal is directly fed into the coal feeder 3 connected with the coal bunker 1 at the other side through the totally-enclosed bidirectional belt conveyor 2 by the coal bunker 1 at the other side through the connecting pipe, and enters the coal mill at the side through the coal dropping pipe for grinding and outputting; the coal quantity of two coal feeders and coal mills can be supplied by one coal bunker simultaneously, so that the heat value or the components of the coal can be switched quickly, the requirement of boiler combustion adjustment can be met, and the like.
The utility model discloses set up perfect sealed wind, do airtight test and operation debugging after the on-the-spot installation is accomplished.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A coal blending system for fast switching coal types between coal bunkers comprises coal bunkers arranged side by side, and is characterized in that a fully-closed bidirectional belt conveyor arranged horizontally is arranged on a coal feeder platform between the coal bunkers, a weighing module and a metering module are arranged in the fully-closed bidirectional belt conveyor, a coal inlet and a coal conveying port are arranged at two end parts of the fully-closed bidirectional belt conveyor, downward connecting pipes are arranged on the side walls of the bottoms of the two coal bunkers, the bottom end of each connecting pipe is connected with the coal inlet of the fully-closed bidirectional belt conveyor, a first gate plate door is arranged in the middle of each connecting pipe, a coal outlet at the bottom of each coal bunker is connected with a coal feeder inlet pipeline, a second gate plate door is arranged in the middle of each coal feeder inlet pipeline, and an output coal outlet of the fully-closed bidirectional belt conveyor is connected with the tail part of the coal feeder and is arranged at the upper part of a coal feeder discharge port, and a third gate plate door is arranged from the outlet of the totally-enclosed bidirectional belt conveyor to the tail part of the coal feeder, a discharge port of the coal feeder is connected to a coal mill through a coal dropping pipe, and a fourth gate plate door is arranged in the middle of the coal dropping pipe.
2. The coal bunker coal type rapid switching coal blending system as claimed in claim 1, wherein a coal feeder distributing baffle groove is added in an upper access pipe area of the coal feeder discharge port shell and used for dividing a raw coal flow and a newly added pipe entering coal flow.
3. The coal blending system for rapidly switching coal types between coal bunkers according to claim 1, wherein the first gate door, the second gate door, the third gate door and the fourth gate door are pneumatic double gate doors.
4. The coal blending system for rapidly switching coal types between coal bunkers according to claim 1, wherein the first gate door, the second gate door, the third gate door and the fourth gate door are hydraulic double gate doors.
5. The coal bunker coal type rapid switching coal blending system as claimed in claim 1 or 2, wherein rappers are arranged on the connecting pipe and the outlet pipe section of the bidirectional belt conveyor.
6. The coal bunker bay coal kind rapid switching coal blending system of claim 1, wherein the totally enclosed bi-directional belt conveyor employs a closed positive pressure square housing.
7. The coal bunker coal type rapid switching coal blending system as claimed in claim 1, wherein the totally-enclosed bidirectional belt conveyor is in a belt conveying mode, and a scraper type cleaning device is arranged at the bottom of the totally-enclosed bidirectional belt conveyor.
8. The coal bunker coal kind rapid switching coal blending system of claim 1, wherein the two sides and the end of the totally-enclosed bidirectional belt conveyor are provided with observation holes and cleaning brushes.
9. The system of claim 1, wherein the system is controlled by PLC logic and is in communication and interlocking protection with existing coal feeding and combustion control systems.
10. The coal bunker bay coal kind rapid switching coal blending system as claimed in claim 1, wherein the totally enclosed bidirectional belt conveyor is connected and controlled in forward and reverse rotation and rotation speed through a variable frequency drive motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023281150.4U CN215247801U (en) | 2020-12-29 | 2020-12-29 | Coal blending system for rapidly switching coal types between coal bunkers |
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| CN202023281150.4U CN215247801U (en) | 2020-12-29 | 2020-12-29 | Coal blending system for rapidly switching coal types between coal bunkers |
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| CN215247801U true CN215247801U (en) | 2021-12-21 |
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| CN202023281150.4U Active CN215247801U (en) | 2020-12-29 | 2020-12-29 | Coal blending system for rapidly switching coal types between coal bunkers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117657815A (en) * | 2023-12-13 | 2024-03-08 | 万平 | Coal-fired power plant compartment coal blending device and method |
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2020
- 2020-12-29 CN CN202023281150.4U patent/CN215247801U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117657815A (en) * | 2023-12-13 | 2024-03-08 | 万平 | Coal-fired power plant compartment coal blending device and method |
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