阅读说明：本技术 一种火力发电厂制粉系统用给煤系统 (Coal feeding system for coal pulverizing system of thermal power plant ) 是由 李守磊 董兆杰 鲁统浩 孙树人 徐潇悦 张瑾 于 2021-09-01 设计创作，主要内容包括：本发明公开了一种火力发电厂制粉系统用给煤系统,包括原煤仓,所述原煤仓的出口端连接有落煤管,所述落煤管的出口端滑动设置有能以任意开度往复运动的上煤闸门,所述原煤仓内设置有用于分隔煤仓的竖向第一分隔板,所述落煤管内设置有用于分隔煤管的竖向第二分隔板,所述第一分隔板与所述第二分隔板位于同一平面。本发明可自主灵活选择入炉煤煤质,消除了现有制粉系统只能使用根据煤场掺配的单一煤种,保证现有以及近期电力发展阶段锅炉燃烧稳定安全,极大地保证了火力发电厂快速响应电网升、降负荷的能力,为电力系统的安全提供了可靠的保证。(The invention discloses a coal supply system for a coal pulverizing system of a thermal power plant, which comprises a raw coal bin, wherein the outlet end of the raw coal bin is connected with a coal dropping pipe, the outlet end of the coal dropping pipe is slidably provided with a coal feeding gate capable of reciprocating at any opening degree, a vertical first partition plate for partitioning the coal bin is arranged in the raw coal bin, a vertical second partition plate for partitioning the coal pipe is arranged in the coal dropping pipe, and the first partition plate and the second partition plate are positioned on the same plane. The invention can independently and flexibly select the coal quality of the coal as fired, eliminates the problem that the existing coal pulverizing system can only use a single coal type mixed according to a coal yard, ensures the stable and safe combustion of the boiler in the existing and recent power development stages, greatly ensures the capability of a thermal power plant for rapidly responding to the power grid to rise and fall loads, and provides reliable guarantee for the safety of a power system.)

1. The utility model provides a coal feeding system for coal pulverizing system of thermal power factory, its characterized in that, includes raw coal bunker (1), the exit end of raw coal bunker (1) is connected with coal breakage pipe (2), the exit end of coal breakage pipe (2) slides and is provided with can be with arbitrary aperture reciprocating motion's last coal gate (3), be provided with vertical first division board (4) that are used for separating the coal bunker in raw coal bunker (1), be provided with vertical second division board (5) that are used for separating the coal pipe in coal breakage pipe (2), first division board (4) with second division board (5) are located the coplanar.

2. The coal feeding system for the pulverizing system of the thermal power plant as claimed in claim 1, wherein a traveling track (6) having the same reciprocating direction as the upper coal gate (3) is arranged below the outlet end of the coal dropping pipe (2), the upper coal gate (3) is installed on the traveling track (6), and the upper coal gate (3) is connected with a driving mechanism (7) for driving the reciprocating motion of the upper coal gate.

3. The coal feeding system for the pulverizing system of the thermal power plant as claimed in claim 2, wherein said driving mechanism (7) is a forward and reverse electric mechanism.

4. The coal feeding system for the coal pulverizing system of the thermal power plant as claimed in claim 1, wherein said raw coal bunker (1) is in the shape of a frustum with a large top and a small bottom.

5. The coal feeding system for the coal pulverizing system of the thermal power plant as claimed in claim 1, wherein the first partition plate (4) is located at the vertical central plane of the raw coal bunker (1), and the second partition plate (5) is located at the vertical central plane of the coal dropping pipe (2).

6. The coal feeding system for the coal pulverizing system of the thermal power plant as claimed in claim 1, wherein the diameter of the coal dropping pipe (2) is the same as the diameter of the outlet end of the raw coal bunker (1).

7. The coal feeding system for the coal pulverizing system of the thermal power plant as claimed in claim 1, wherein said upper coal gate (3) is a square plate, and the side length of the square plate is larger than the diameter of said coal dropping pipe (2).

8. The coal feeding system for the coal pulverizing system of the thermal power plant as claimed in claim 1, wherein the first partition plate (4) is fixedly connected with the inner wall of the raw coal bunker (1), and the second partition plate (5) is fixedly connected with the inner wall of the coal dropping pipe (2).

Technical Field

The invention belongs to the technical field of thermal power generation, and particularly relates to a coal feeding system for a coal pulverizing system of a thermal power plant.

Background

Due to partial disadvantages of poor sustainability, frequent change, poor stability and the like, the new energy power generation form has higher occupation ratio in the whole power generation system and provides higher requirements and challenges for other traditional power generation forms. Therefore, the heat power plant is promoted to convert to the direction meeting the peak load regulation and frequency modulation requirements of the power grid. Among them, the coal-fired power plant is the main form of the thermal power plant in China. The technical indexes of the coal fired by the thermal power plant, which is also commonly called as power coal, mainly include moisture, ash content, volatile matters, calorific value, ignition temperature, grindability and the like, and are closely related to the combustion condition of the power coal. For example, the higher the volatile component of the power coal, the easier it is to catch fire and the combustion is stable, and we generally refer to as "brown coal", which has better economy, is suitable for ensuring the boiler combustion safety in the low-load state of a thermal power plant, and avoids the fire extinguishing of the boiler caused by poor combustion condition, and further easily causes abnormal shutdown of the unit; in addition, the higher the heat value of the power coal is, the lower the coal consumption required by the unit generating capacity of the power coal is, the lower the total fuel quantity is compared with the heat value, the less the coal type is, the power coal is generally called as the bituminous coal, the higher the price is compared with the lignite, the power coal is suitable for ensuring that a powder making system and a wind smoke system do not exceed the output under the high load state of a thermal power plant, and the safety and the stability of the operation of each device are ensured, and simultaneously, the power coal is beneficial to relevant parameters such as the plant power consumption, the unit coal consumption and the like. In the past, the coal with different volatile components and heat values is selected in a coal yard of a thermal power plant, is fully mixed and blended, and then is conveyed to a raw coal bin above a coal feeder through a belt to serve as a small storage area so as to meet the requirement of the coal in the same day or several days. However, with the change and development of the situation of the power industry, the thermal power plant is frequently changed from full load to 50% load, even 25% load, to full load within one day, and the cycle is repeated for many times, the coal as fired can not ensure the stable combustion of the boiler at low load and the peak output of the unit at high load according to the conventional single blending method, so that the hidden trouble that the unit is fully exposed in the actual production process is caused, and the safe and stable operation of the unit is greatly influenced.

The raw coal bunker of the Huaneng sunshine power plant powder preparation system is in a big-end-up small-type conical design, a vertical section coal dropping pipe is connected to the lower opening, a horizontal pull type coal gate driven by a single electric actuator is installed below the coal dropping pipe, the control of the coal gate can only meet two instructions of full opening and full closing, and the coal quantity of a coal mill is changed by a coal feeder driven by a variable frequency motor below.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a coal supply system for a coal pulverizing system of a thermal power plant, which can independently and flexibly select the coal quality of coal as fired, eliminates the problem that the existing coal pulverizing system only can use a single coal type mixed according to a coal yard, ensures the stable and safe combustion of a boiler in the existing and recent power development stages, greatly ensures the capability of the thermal power plant for rapidly responding to the power grid to rise and fall loads, and provides reliable guarantee for the safety of a power system.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the utility model provides a coal feeding system for coal pulverizing system of thermal power factory, includes the raw coal storehouse, the exit end of raw coal storehouse is connected with the coal breakage pipe, the exit end of coal breakage pipe slides and is provided with the last coal gate that can be with arbitrary aperture reciprocating motion, be provided with the vertical first division board that is used for separating the coal storehouse in the raw coal storehouse, the intraductal vertical second division board that is used for separating the coal pipe that is provided with of coal breakage, first division board with the second division board is located the coplanar.

Furthermore, a traveling track in the same reciprocating motion direction as the upper coal gate is arranged below the outlet end of the coal dropping pipe, the upper coal gate is mounted on the traveling track, and a driving mechanism for driving the upper coal gate to reciprocate is connected to the upper coal gate.

Further, the driving mechanism is a forward and reverse rotation electric mechanism.

Further, the raw coal bunker is in a frustum shape with a large upper part and a small lower part.

Furthermore, the first partition plate is located at the vertical central plane of the raw coal bin, and the second partition plate is located at the vertical central plane of the coal dropping pipe.

Further, the diameter of the coal dropping pipe is the same as that of the outlet end of the raw coal bin.

Furthermore, the coal feeding gate is a square plate, and the side length of the square plate is larger than the diameter of the coal dropping pipe.

Furthermore, the first partition plate is fixedly connected with the inner wall of the raw coal bin, and the second partition plate is fixedly connected with the inner wall of the coal dropping pipe.

Compared with the prior art, the invention has at least the following beneficial effects: the invention provides a coal feeding system for a coal pulverizing system of a thermal power plant, wherein a partition plate is arranged in a vertical section coal dropping pipe connected with a raw coal bin and a lower port of the raw coal bin, and two or more coal types can be respectively placed, for example, one bin is used for placing high-volatile lignite, and the other bin is used for placing high-calorific-value bituminous coal. The upper coal gate which can reciprocate with any opening degree is arranged below the coal dropping pipe, and different coal dropping areas of the two sub-bins can be adjusted by adjusting the opening degree of the upper coal gate, so that the proportion of the bituminous coal and the lignite can be flexibly and changeably selected. Meanwhile, the requirement of full opening and full closing of the coal feeding gate can be met. In conclusion, the invention can independently and flexibly select the coal quality of the coal as fired, eliminates the problem that the existing coal pulverizing system can only use a single coal type mixed according to a coal yard, ensures the stable and safe combustion of the boiler in the existing and recent electric power development stages, greatly ensures the capability of a thermal power plant for rapidly responding to the load rise and the load fall of a power grid, and provides reliable guarantee for the safety of the electric power system.

Furthermore, an advancing track with the same reciprocating direction as the upper coal gate is arranged below the outlet end of the coal dropping pipe, the upper coal gate is arranged on the advancing track, a driving mechanism for driving the upper coal gate to reciprocate is connected to the upper coal gate, and the opening degree of the upper coal gate is safely and reliably adjusted through the driving mechanism.

Furthermore, the driving mechanism is a forward and reverse rotation electric mechanism, so that the cost is saved, and the forward and reverse directions of the coal feeding gate in the advancing track can be advanced only by realizing forward and reverse rotation of the motor by using a single electric actuating mechanism.

Furthermore, the first partition plate is located at the vertical central plane of the raw coal bin, and the second partition plate is located at the vertical central plane of the coal dropping pipe, so that the coal dropping amount can be calculated and controlled conveniently.

Furthermore, the diameter of the coal dropping pipe is the same as that of the outlet end of the raw coal bin, so that the coal dropping amount can be calculated and controlled conveniently.

Furthermore, the coal feeding gate is a square plate, and the side length of the square plate is larger than the diameter of the coal dropping pipe, so that the coal feeding gate can reliably control the coal dropping opening of the coal dropping pipe.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a front view of a coal feeding gate of a coal feeding system for a coal pulverizing system of a thermal power plant according to the present invention in a fully closed state;

FIG. 2 is a front view of a coal feeding system of a coal supply system of a thermal power plant coal pulverizing system in an opened state of a right side bin of a coal feeding gate;

FIG. 3 is a front view of a coal feeding system of a coal supply system of a thermal power plant coal pulverizing system in an opened state of a left side bin of a coal feeding gate;

FIG. 4 is a front view of a coal feeding gate of a coal feeding system for a coal pulverizing system of a thermal power plant according to the present invention in a fully opened state;

FIG. 5 is a side view of a coal feeding system for a coal pulverizing system of a thermal power plant in accordance with the present invention;

FIG. 6 is a top view of a coal feeding system for a coal pulverizing system of a thermal power plant according to the present invention.

In the figure: 1-raw coal bunker; 2-a coal dropping pipe; 3-a coal feeding gate; 4-a first divider plate; 5-a second divider plate; 6-a travel track; 7-a driving mechanism.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In one embodiment of the present invention, a coal supply system for a coal pulverizing system of a thermal power plant includes a raw coal bunker 1, and the raw coal bunker 1 is in a frustum shape with a large top and a small bottom. The outlet end of the raw coal bunker 1 is connected with a coal dropping pipe 2, and preferably, the diameter of the coal dropping pipe 2 is the same as that of the outlet end of the raw coal bunker 1. The outlet end of the coal dropping pipe 2 is provided with a coal feeding gate 3 capable of reciprocating at any opening degree in a sliding manner, a vertical first partition plate 4 used for separating the coal bunker is arranged in the raw coal bunker 1, the first partition plate 4 is fixedly connected with the inner wall of the raw coal bunker 1, a vertical second partition plate 5 used for separating the coal pipe is arranged in the coal dropping pipe 2, the second partition plate 5 is fixedly connected with the inner wall of the coal dropping pipe 2, and the first partition plate 4 and the second partition plate 5 are located on the same plane. Preferably, the first partition plate 4 is located at the vertical central plane position of the raw coal bin 1, and the second partition plate 5 is located at the vertical central plane position of the coal dropping pipe 2.

In a preferred embodiment, a traveling rail 6 having the same reciprocating direction as the upper coal gate 3 is provided below the outlet end of the coal dropping pipe 2, the upper coal gate 3 is mounted on the traveling rail 6, and a driving mechanism 7 for driving the upper coal gate 3 to reciprocate is connected to the upper coal gate 3. Preferably, the driving mechanism 7 is a forward and reverse rotation electric mechanism.

Preferably, the upper coal gate 3 is a square plate, and the side length of the square plate is larger than the diameter of the coal dropping pipe 2.

The invention is optimized and reformed on the basis of the original structure, and the baffle plates are arranged in the coal dropping pipes of the vertical sections connected with the original coal bins with the large upper part and the small lower part in the conical design and the lower openings thereof, so that two or more coal types can be respectively placed, for example, one bin is used for placing high-volatile lignite, and the other bin is used for placing high-calorific-value bituminous coal. The lower part of the coal dropping pipe is provided with a horizontal pull-out type coaling gate driven by a single electric actuating mechanism, and different coal dropping areas of the two sub-bins can be adjusted through different staying positions of the coaling gate in a traveling track, so that the proportion of bituminous coal and lignite can be flexibly and changeably selected. Meanwhile, the requirement of full opening and full closing of the coal feeding gate can be met. The design of a single electric actuating mechanism is different from the design of a plurality of double electric actuating mechanisms on the market, so that the cost is saved, and the coal gate can move forwards and backwards in the guide rail only by realizing the forward and reverse rotation of the motor by the single electric actuating mechanism.

That is to say, according to the invention, according to the arrangement of different coal types in different bins, the horizontal pull-type coal feeding gate and the traveling track which are driven by the single electric actuating mechanism are optimized, the high volatile coal and the high heat value coal are adjusted to the opening change of the coal dropping port at the raw coal bin through the position change of the coal feeding gate at the inlet of the coal feeder, and the convenient transformation that the quality of the coal entering the furnace is adjusted flexibly according to the required proportion can be realized. The modification can be carried out during the normal operation of the unit, and can be realized by adopting fewer isolation measures and shorter modification period by switching the shutdown powder making system without influencing the load carrying capacity of the unit. The invention ensures the stable and safe combustion of the boiler in the current and recent power development stages, has the function of flexibly adjusting the quality of coal entering the boiler, greatly ensures the capability of a thermal power plant for rapidly responding to the load rise and the load fall of a power grid, and provides reliable guarantee for the safety of a power system.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.