Flexible coal blending device for separated bins

Abstract

The utility model relates to the technical field of coal blending devices, in particular to a flexible coal blending device with separated bins, which comprises a long-distance segmented weighing coal feeder with one end provided with a segmented weighing coal feeder driving device, and further comprises a raw coal bin A, a raw coal bin B, a raw coal bin C, a raw coal bin D, a raw coal bin E and a raw coal bin F which are positioned above the long-distance segmented weighing coal feeder. Through the action of the long-distance segmented weighing coal feeder and the adjustable coal plough, the device has the advantages of wide radiation range, flexible radiation, accurate coal blending combustion and investment reduction, and solves the problems that after an existing single bin is transformed, only a coal mill corresponding to the bin can be radiated, the radiation range is small, and the cost is low. The problems that accurate blending combustion cannot be achieved in intermittent blending combustion, coal feeding belt premixing blending combustion and separate grinding blending combustion modes, the blending combustion range is small, and the number of coal feeders is increased are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of coal blending devices, specifically a flexible coal blending device with compartments. Background Technology

[0002] To absorb new energy sources, coal-fired power plants are gradually transforming from pillar power sources to system-regulating power sources, with the frequency of peak shaving increasing. Simultaneously, to reduce the overall cost of coal-fired power plants, the types of coal used by coal-fired power units are becoming more complex and varied. Due to the limited adaptability of boilers to different coal types, coupled with the uncertainty of load, in order to maximize peak-shaving capacity during peak periods and minimize the negative impacts of using coal types that deviate significantly from the design specifications, power plants are gradually exploring coal-fired compartment modification technology and flexible coal blending technology.

[0003] Current coal bin conversion technologies mainly include partitioned bin conversion and converting part of the raw coal bin into peak-shaving bins, with additional feeders transporting the peak-shaving coal to the leading mill to achieve peak coal distribution. However, partitioned bin conversion uses a shared chute at the feeder inlet. When switching coal types, the raw coal in the shared chute must be burned before the new coal type can be fed, resulting in a significant delay. Secondly, single-bin conversion only benefits the corresponding mill, limiting the coverage area. While the peak-shaving bin with added feeders offers a wider coverage area than partitioned bin conversion, it still only benefits adjacent mills. Furthermore, when peak coal distribution is not needed, issues such as inter-layer mill operation, unstable combustion, or prolonged burning of peak-shaving coal in the peak-shaving bin can occur, failing to maximize the blending effect. Coal blending technologies mainly include intermittent blending, pre-mixing with conveyor belts, and blending between different mills. A smaller approach involves dividing the raw coal bin into two smaller bins and adding two feeders to achieve precise coal blending. Intermittent co-firing, pre-mixing co-firing via coal conveyor belt, and co-firing via separate grinding cannot achieve precise co-firing. Modifying the raw coal bunker and adding two coal feeders can achieve precise co-firing, but it cannot use the lead bunker for co-firing, the co-firing range is small, and the number of coal feeders increases significantly. Therefore, we propose a flexible coal blending device with separate bunkers. Utility Model Content

[0004] The purpose of this utility model is to provide a flexible coal blending device with a wide and flexible radiation range, precise coal blending and combustion, and reduced investment. It solves the problems of existing single-compartment modifications that can only radiate the corresponding coal mill in the same compartment, resulting in a small radiation range. When peak demand is not required, it is easy to encounter situations such as inter-layer mill operation, unstable combustion, or long-term combustion of peak-shaving coal in the peak-shaving compartment, which cannot maximize the blending effect. At the same time, intermittent blending, pre-mixing and blending on the coal conveyor belt, and blending in separate mills cannot achieve precise blending, have a small blending range, and require a large increase in the number of coal feeders.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a flexible coal distribution device with compartments, comprising a long-distance segmented weighing feeder with a drive device installed at one end, and further comprising:

[0006] The raw coal bunkers A, B, C, D, E and F are located above the long-distance segmented weighing coal feeder. Side bunkers A, B, C, D and E are respectively provided on one side of the raw coal bunkers A, B, C, D and E.

[0007] The original coal feeder is located below the long-distance segmented weighing coal feeder 1 and is set up in correspondence with the raw coal bunkers A, B, C, D, E and F.

[0008] An adjustable plow is installed at the junction of the long-distance segmented weighing coal feeder and the original coal feeder.

[0009] Preferably, the lower ends of side compartments A, B, C, D and E are each provided with a corresponding first electrically controlled valve 11.

[0010] Preferably, the bottom of the raw coal bunkers A, B, C, D, E, and F is provided with an original coal feeder inlet pipe between it and the rear end of the corresponding original coal feeder.

[0011] Preferably, a corresponding second electrically controlled valve is provided at the upper end of the original coal feeder inlet pipe.

[0012] Preferably, the original coal feeder is provided with a long-distance segmented coal feeder drop pipe corresponding to the adjustable coal plow at the middle of the top.

[0013] Preferably, the upper end of the discharge pipe of the long-distance segmented coal feeder is connected to a discharge hopper that fits against one side of the long-distance segmented weighing coal feeder.

[0014] Preferably, the original coal feeder is provided with a downcomer pipe from the original coal feeder outlet to the coal mill at the front end of the bottom.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model greatly improves the coverage of the distribution bins, enabling coal from one bin to be transported to various lower-level coal mills, thereby increasing the flexibility of peak and precise coal blending and improving overall operating efficiency.

[0017] 2. Once the peak-shaving bin is determined, when peak demand is required, and provided the feed volume of the peak-shaving bin is sufficient, the adjustable coal plow can be used to transport high-calorific-value coal to all subsequent mills, significantly increasing the calorific value of the coal entering the furnace, greatly improving peak-shaving capacity, peak-shaving flexibility and coverage, and solving the problems of small coverage or limited peak-shaving capacity and inflexibility when the mills being covered are under maintenance, which are problems with the original bin technology.

[0018] 3. When peak demand is not required, this utility model can utilize the upper-level side chamber of the peak-shaving warehouse to transport low-calorific-value coal to the corresponding coal mill in the peak-shaving warehouse, thus avoiding the situation of interlayer mill operation.

[0019] 4. When there is a need for coal blending, this utility model enables multiple coal mills to simultaneously feed two types of coal by using the existing coal feeder and the long-distance segmented weighing coal feeder, thereby achieving a precise coal blending and co-firing effect.

[0020] 5. This utility model adopts a long-distance segmented weighing coal feeder. Compared with setting a separate coal feeder for each compartment, it reduces the space occupied in the raw coal bunker area, reduces the number of unidirectional coal feeders, and reduces investment. Attached Figure Description

[0021] Figure 1 This is a first-view structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the second-view structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the third-view portion of the present invention.

[0024] Figure 4 This is a schematic diagram of the fourth-view portion of the present invention.

[0025] In the diagram: 1. Long-distance segmented weighing coal feeder; 2. Drive unit for long-distance segmented weighing coal feeder; 3. Adjustable coal plow; 4. Discharge pipe of long-distance segmented coal feeder; 5. Existing coal feeder; 6. Outlet pipe of existing coal feeder to downcomer of coal mill; 7. Inlet pipe of existing coal feeder; 8. Raw coal bunker A; 801. Raw coal bunker B; 802. Raw coal bunker C; 803. Raw coal bunker D; 804. Raw coal bunker E; 805. Raw coal bunker F; 9. Side bunker A; 901. Side bunker B; 902. Side bunker C; 903. Side bunker D; 904. Side bunker E; 10. Discharge hopper; 11. First solenoid valve; 12. Second solenoid valve. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The components of this application, including the long-distance segmented weighing coal feeder 1, the long-distance segmented weighing coal feeder drive device 2, the adjustable coal plow 3, the long-distance segmented coal feeder discharge pipe 4, the original coal feeder 5, the original coal feeder outlet to the pulverizer downcomer pipe 6, the original coal feeder inlet pipe 7, the raw coal bunker A8, the raw coal bunker B801, the raw coal bunker C802, the raw coal bunker D803, the raw coal bunker E804, the raw coal bunker F805, the side bunker A9, the side bunker B901, the side bunker C902, the side bunker D903, the side bunker E904, the discharge hopper 10, the first solenoid valve 11, and the second solenoid valve 12, are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0030] Example 1

[0031] Please see Figures 1-4 As shown, this utility model provides a technical solution: a flexible coal distribution device with compartments, including a long-distance segmented weighing feeder 1 with one end installed at a distance from the segmented weighing feeder drive device 2, and further including:

[0032] The raw coal bunkers A8, B801, C802, D803, E804 and F805 are located above the long-distance segmented weighing coal feeder 1. Side bunkers A9, B901, C902, D903 and E804 are respectively provided on one side of the raw coal bunkers A8, B801, C802, D803 and E804.

[0033] The original coal feeder 5 is located below the long-distance segmented weighing coal feeder 1 and is set up in correspondence with the raw coal bunkers A8, B801, C802, D803, E804 and F805.

[0034] An adjustable plow 3 is installed at the intersection of the long-distance segmented weighing coal feeder 1 and the original coal feeder 5.

[0035] The bottom of raw coal bunkers A8, B801, C802, D803, E804 and F805 are connected to the rear end of the corresponding original feeders 5 by the original feeder inlet pipe 7. The middle of the top of the original feeder 5 is connected to the long-distance segmented feeder drop pipe 4 corresponding to the adjustable plow 3. The front end of the bottom of the original feeder 5 is connected to the original feeder outlet to the coal mill downcomer pipe 6.

[0036] This technical solution utilizes suspended small coal bunkers to transport the coal from bunkers A8, B801, C802, D803, E804, and F805 to a long-distance segmented weighing feeder 1. With the assistance of the original feeder inlet pipe 7, the coal from bunkers A8, B801, C802, D803, E804, and F805 can be transported to the corresponding original feeders 5. The coal from the upstream bunkers is then transported to the downstream mill via the outlet of the original feeder and the downcomer 6 of the mill.

[0037] If a coal bunker in the middle is used as a peak-shaving bunker (for high-calorific-value coal), when the unit needs to reach its peak load, the coal from the peak-shaving bunker can be transported through the corresponding side bunker to the long-distance segmented weighing feeder 1 and the adjustable plow 3, and then into the corresponding original feeder 5 for use by the next-stage coal mill. This increases the calorific value of the coal entering the furnace and achieves the peak-shaving effect. When peak loading is not required, the non-peak-shaving bunker (i.e., low-calorific-value coal) can be transported through the corresponding side bunker to the corresponding coal mill of the peak-shaving bunker via the long-distance segmented weighing feeder 1 and the adjustable plow 3, thereby increasing the combustion ratio of low-calorific-value coal.

[0038] When precise coal blending is required, flexible and precise coal blending can be achieved by using the existing coal feeder 5 and the long-distance segmented weighing coal feeder 1. That is, the long-distance segmented weighing coal feeder 1 and the existing coal feeder 5 respectively transport a certain amount of the two types of coal, which are finally sent to the corresponding lower-level coal mill through the existing coal feeder 5.

[0039] It should be noted that the long-distance segmented weighing coal feeder 1, the long-distance segmented weighing coal feeder drive device 2, the adjustable coal plow 3, and the original coal feeder 5 are all mature products that can be directly purchased on the market. For example, the long-distance segmented weighing coal feeder 1 can be the product model: GLD series weighing coal feeder. Since it is existing technology, it will not be described in detail here.

[0040] Example 2

[0041] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, the lower ends of side compartments A9, B901, C902, D903 and E904 are all equipped with corresponding first solenoid valves 11, and the upper end of the original coal feeder inlet pipe 7 is equipped with corresponding second solenoid valves 12.

[0042] This technical solution facilitates remote control of the device through the installation of the first solenoid valve 11 and the second solenoid valve 12.

[0043] Example 3

[0044] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, the upper end of the long-distance segmented coal feeder discharge pipe 4 is connected to a discharge hopper 10 that is attached to one side of the long-distance segmented weighing coal feeder 1.

[0045] This technical solution ensures that the coal conveyed by the adjustable plow 3 is fully collected by the long-distance segmented coal feeder discharge pipe 4 through the setting of the discharge hopper 10.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A flexible coal distribution device with compartments, comprising a long-distance segmented weighing feeder (1) with one end installed at a distance from the segmented weighing feeder drive device (2), characterized in that, Also includes: The raw coal bunkers A (8), B (801), C (802), D (803), E (804) and F (805) are located above the long-distance segmented weighing coal feeder (1). Side bunkers A (9), B (901), C (902), D (903) and E (904) are respectively provided on one side of the raw coal bunkers A (8), B (801), C (802), D (803) and E (904). The original coal feeder (5) is located below the long-distance segmented weighing coal feeder (1) and is set up in correspondence with the raw coal bunkers A (8), B (801), C (802), D (803), E (804) and F (805); An adjustable plow (3) is installed at the intersection of the long-distance segmented weighing coal feeder (1) and the original coal feeder (5).

2. The flexible coal blending device with compartments according to claim 1, characterized in that: The lower ends of side compartments A (9), B (901), C (902), D (903) and E (904) are each equipped with a corresponding first solenoid valve (11).

3. The flexible coal blending device with compartments according to claim 1, characterized in that: The bottom of the raw coal bunkers A (8), B (801), C (802), D (803), E (804) and F (805) are connected to the rear end of the corresponding original coal feeder (5) by the original coal feeder inlet pipe (7).

4. The flexible coal blending device with compartments according to claim 3, characterized in that: The upper end of the original coal feeder inlet pipe (7) is equipped with a corresponding second electric control valve (12).

5. The flexible coal blending device with compartments according to claim 1, characterized in that: The original coal feeder (5) is equipped with a long-distance segmented coal feeder drop pipe (4) at the middle of the top, which corresponds to the adjustable coal plow (3).

6. The flexible coal blending device with compartments according to claim 5, characterized in that: The upper end of the long-distance segmented coal feeder discharge pipe (4) is connected to a discharge hopper (10) that is attached to one side of the long-distance segmented weighing coal feeder (1).

7. The flexible coal blending device with compartments according to claim 1, characterized in that: The original coal feeder (5) is provided with a downcomer pipe (6) from the outlet of the original coal feeder to the coal mill at the front end of the bottom.

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