Hyperbolic warehouse coal feeding electric power peak shaving system

Abstract

The invention discloses a hyperbolic bunker coal feeding electric peak shaving system which comprises a high-quality coal feeding bunker, a first hyperbolic bunker hopper, a first hyperbolic bunker hopper outlet gate, a high-quality coal feeding bunker outlet gate, a first coal feeder, a first second coal feeder, a first second coal feeder outlet gate, a second first coal feeder and an inferior coal feeding bunker. The system comprises a first coal feeder, a second hyperbola bin dividing hopper, a second hyperbola bin dividing hopper outlet flashboard door, a second coal feeder with one end connected with a bottom outlet of the second hyperbola bin dividing hopper and the other end connected with the first coal feeder, and a second coal feeder outlet flashboard door installed on a lower outlet of the second coal feeder. And the inferior coal feeding bunker outlet flashboard door is arranged on the lower outlet of the inferior coal feeding bunker. The flexible peak regulation requirement of a power grid of a coal-fired power plant is met, the storage efficiency is improved, material conveying is smooth, the material circulation effect is good, the bearing capacity is high, material conveying is safe, and the service life is long. The method can be widely applied to the technical field of coal-fired power plant peak regulation.

Description

Technical Field

[0001] The present invention relates to a hyperbolic compartment coal-feeding power peak-shaving system, which can be widely used in the technical field of peak-shaving in coal-fired power plants. Background Art

[0002] As new power systems are being built, the large-scale integration of distributed renewable energy sources such as wind and solar power into the grid has led to an explosive growth in demand for flexible regulation of traditional thermal power units. To meet the stringent requirements for grid flexibility, thermal power plants must retrofit and upgrade their units for increased flexibility. Failure to do so in a timely manner will result in significant peak-shaving compensation costs. Thermal power is shifting from its traditional power generation role to one of supporting and service capabilities, with load characteristics also becoming more flexible and rapid. Thermal power units must not only operate stably under high loads and achieve rated loads, but also possess deep peak-shaving capabilities.

[0003] However, current coal blending at thermal power plants presents numerous challenges. For example, a typical coal bunker configuration involves a feeder and a pulverizer per raw coal bunker, with each bunker capable of storing only one type of coal. New coal can only be replaced after the old coal in the bunker has been completely burned. This hinders rapid switching of coal types, hindering prompt response to the grid's peak-shaving needs and hindering peak-shaving rate compliance. Summary of the Invention

[0004] The purpose of the present invention is to provide a hyperbolic compartment coal-feeding power peak-shaving system that meets the flexibility peak-shaving requirements of coal-fired power plant power grids, improves storage efficiency, ensures smooth material transportation, has good material circulation effects, has strong carrying capacity, is safe in material transportation, and has a long service life.

[0005] In order to achieve the above-mentioned purpose, the hyperbolic coal-feeding power peak-shaving system of the present invention comprises a high-quality coal bunker, a No. 1 hyperbolic bunker hopper arranged on the side of the high-quality coal bunker, a No. 1 hyperbolic bunker hopper outlet gate installed on the lower outlet of the No. 1 hyperbolic bunker hopper, a high-quality coal bunker outlet gate installed on the lower outlet of the high-quality coal bunker, a No. 1 first coal feeder connected to the bottom port of the high-quality coal bunker, a No. 1 second coal feeder connected to the bottom port of the No. 1 hyperbolic bunker hopper, a No. 1 second coal feeder outlet gate installed on the lower outlet of the No. 1 second coal feeder, and a No. 1 first coal feeder connected to the bottom port of the No. 1 hyperbolic bunker hopper. The No. 2 first coal feeder connected to the bottom outlet of the second coal feeder, the low-quality coal bunker whose bottom outlet is connected to the No. 2 first coal feeder, the No. 2 hyperbolic sub-bin hopper connected to the side of the low-quality coal bunker, the No. 2 hyperbolic sub-bin hopper outlet gate installed on the lower outlet of the No. 2 hyperbolic sub-bin hopper, the No. 2 second coal feeder connected at one end to the bottom outlet of the No. 2 hyperbolic sub-bin hopper and at the other end to the No. 1 first coal feeder, the No. 2 second coal feeder outlet gate installed on the lower outlet of the No. 2 second coal feeder, the low-quality coal bunker outlet gate installed on the lower outlet of the low-quality coal bunker.

[0006] The hyperbolic coal-feeding and power peak-shaving system of the present invention comprises the high-quality coal feeding bin, the low-quality coal feeding bin, the No. 1 hyperbolic coal-feeding bin hopper, and the No. 2 hyperbolic coal-feeding bin hopper, all of which have rappers arranged on their bin walls.

[0007] In the hyperbolic compartment coal-feeding and power peak-shaving system of the present invention, the No. 1 hyperbolic compartment hopper and the No. 2 hyperbolic compartment hopper are provided with multiple reinforcing ribs at the transition pipe sections.

[0008] The hyperbolic compartment coal-feeding and power peak-shaving system of the present invention, the No. 1 hyperbolic compartment hopper and the No. 2 hyperbolic compartment hopper are also provided with a hoisting reinforcement bracket.

[0009] In the hyperbolic compartment coal-feeding and power peak-shaving system of the present invention, the cross-sectional areas of the No. 1 hyperbolic compartment hopper and the No. 2 hyperbolic compartment hopper gradually decrease from top to bottom.

[0010] The hyperbolic compartment coal-feeding and power peak-shaving system of the present invention, wherein the first coal feeder No. 1, the second coal feeder No. 1, the first coal feeder No. 2, and the second coal feeder No. 2 are weighing-type belt frequency-modulated coal feeders, realize accurate material distribution.

[0011] The hyperbolic compartment coal-feeding power peak-shaving system of the present invention, the No. 1 hyperbolic compartment hopper outlet gate, the high-quality coal bunker outlet gate, the No. 1 second coal feeder outlet gate, the No. 2 hyperbolic compartment hopper outlet gate, the No. 2 second coal feeder outlet gate, and the low-quality coal bunker outlet gate are electric or pneumatic two-way gate doors.

[0012] The working principle of the hyperbolic coal-feeding power peak-shaving system of the present invention is as follows: (1) The present invention provides a high-quality coal bunker and a low-quality coal bunker. The difference between the high-quality coal output from the high-quality coal bunker and the low-quality coal output from the low-quality coal bunker is that high-quality coal can ensure good combustion performance, high combustion efficiency, can be fully burned, release more heat, and has a high calorific value, which means that it can release more energy during the combustion process; while low-quality coal has low combustion efficiency due to its own characteristics, such as containing a large amount of coal gangue, and is difficult to fully burn, and has a low calorific value. Therefore, the provision of the high-quality coal bunker and the low-quality coal bunker of the present invention can be applied to peak load regulation of coal-fired power plants.

[0013] (2) When upward peak adjustment is required, the delivery volume of the high-quality coal bunker feeder should be increased as much as possible, and the delivery volume of the low-quality coal bunker feeder should be appropriately increased or kept unchanged. At this time, the low-quality coal bunker outlet gate is closed, and the outlet gate of the No. 1 second coal feeder and the outlet gate of the No. 1 hyperbolic bin hopper are opened in sequence. The high-quality coal in the high-quality coal bunker passes through the outlet gate of the No. 1 hyperbolic bin hopper, enters the feed port of the No. 1 second coal feeder from the No. 1 hyperbolic bin hopper, is transported to the discharge port of the No. 1 second coal feeder through the No. 1 second coal feeder, and enters the No. 2 first coal feeder through the outlet gate of the No. 1 second coal feeder. In this way, the No. 1 first coal feeder and the No. 2 first coal feeder both input high-quality coal to the downstream equipment pulverizer, and at the same time adjust the operating speed of the No. 1 first coal feeder and the No. 2 first coal feeder. At this time, the theoretical maximum calorific value of the coal supplied to the boiler can be reached, and a change rate of 2.2% to 2.5% per minute can be achieved for a load of 50% or above, and a change rate of 1.0% to 1.2% per minute for a load of 30% to 50%, meeting the unit's requirements for rapid upward peak regulation.

[0014] (3) When downward peak adjustment is required, the delivery volume of the high-quality coal bunker feeder is reduced, and the delivery volume of the low-quality coal bunker feeder is increased. At this time, the high-quality coal bunker outlet gate is closed, and the outlet gate of the No. 2 second coal feeder and the outlet gate of the No. 2 hyperbolic bin hopper are opened in sequence. The low-quality coal in the low-quality coal bunker passes through the outlet gate of the No. 2 hyperbolic bin hopper, enters the feed port of the No. 2 second coal feeder from the No. 2 hyperbolic bin hopper, is transported to the discharge port of the No. 2 second coal feeder through the No. 2 second coal feeder outlet gate, and enters the No. 1 first coal feeder through the No. 2 second coal feeder outlet gate. At this time, the No. 1 first coal feeder and the No. 2 first coal feeder both input low-quality coal to the downstream equipment pulverizer. At the same time, the operating speeds of the No. 1 first coal feeder and the No. 2 first coal feeder are adjusted, so that the calorific value of the coal supplied to the boiler can reach the theoretical minimum point, meeting the peak-shaving rate requirements of the unit for rapid downward peak regulation, and the boiler load can be reduced to 30% or even 20% of the rated load, thus meeting the unit's rapid downward peak regulation requirements.

[0015] The hyperbolic compartmented coal-feeding power peak-shaving system of this invention not only ensures stable operation of thermal power units at high loads and reaches rated load, but also achieves load adjustment requirements of 2.2% to 2.5% per minute for units with loads of 50% or above, 1.0% to 1.2% per minute for units with loads of 30% to 50%, and can reduce loads to 30% or even 20% of rated load. Therefore, it meets the peak-shaving requirements of coal-fired power plant grid flexibility.

[0016] The hyperbolic compartment coal-feeding and power peak-shaving system of the present invention, the No. 1 hyperbolic compartment hopper and the No. 2 hyperbolic compartment hopper adopt a hyperbolic structure that is wide at the top and narrow at the bottom, and use the hyperbolic shape to optimize the material flow performance. The hyperbolic silo structure helps the material to slide down naturally, while reducing the friction between the material and the silo wall, thereby reducing the possibility of material jamming, reducing blockage, and improving storage efficiency.

[0017] The hyperbolic bin-type coal-feeding and power peak-shaving system of the present invention features, firstly, a vibrator, also known as an anti-blocking device, for preventing and eliminating "blockage" and "arching" phenomena in various bins caused by internal friction, deliquescence, electrification, and component segregation of materials. Secondly, the cross-sectional areas of the No. 1 and No. 2 hyperbolic bin-type hoppers gradually decrease from top to bottom. The cross-sectional contraction rate of the hoppers conforms to the flow laws of coal particles and the principle of tracing the descending curve, making coal blockage less likely. As a result, material transportation is smooth and material circulation is effective.

[0018] The present invention's hyperbolic coal-feeding peak-shaving system features multiple reinforcing ribs at the transition pipe sections of the No. 1 and No. 2 hyperbolic hoppers, increasing their strength and rigidity. Hoisting reinforcement brackets also enhance the hoppers' load-bearing capacity. This ensures strong load-bearing capacity, safe material transportation, and a long service life.

[0019] In summary, the hyperbolic coal-feeding power peak-shaving system of the present invention meets the peak-shaving requirements of the coal-fired power plant power grid flexibility, improves storage efficiency, ensures smooth material transportation, good material circulation effect, strong carrying capacity, safe material transportation, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments thereof.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a structural schematic diagram of the present invention; Figure 3 yes Figure 2 Left view of; Figure 4 yes Figure 3 A magnified view of the part at point I in the figure. DETAILED DESCRIPTION

[0022] exist Figures 1 to 4 The hyperbolic coal-feeding power peak-shaving system of the present invention comprises a high-quality coal bunker 1, a No. 1 hyperbolic bunker hopper 2 arranged on the side of the high-quality coal bunker, a No. 1 hyperbolic bunker hopper outlet gate 3 installed on the lower outlet of the No. 1 hyperbolic bunker hopper, a high-quality coal bunker outlet gate 4 installed on the lower outlet of the high-quality coal bunker, a No. 1 first coal feeder 5 connected to the bottom port of the high-quality coal bunker, a No. 1 second coal feeder 6 connected to the bottom port of the No. 1 hyperbolic bunker hopper, a No. 1 second coal feeder outlet gate 7 installed on the lower outlet of the No. 1 second coal feeder, and a No. 1 second coal feeder outlet gate 8 connected to the bottom port of the No. 1 second coal feeder. The outlet of the No. 2 first coal feeder 8 is connected to the No. 2 first coal feeder 8, the low-quality coal bunker 9 with the bottom outlet connected to the No. 2 first coal feeder 8, the No. 2 hyperbolic sub-bin hopper 10 connected to the side of the low-quality coal bunker, the No. 2 hyperbolic sub-bin hopper outlet gate 11 installed on the lower outlet of the No. 2 hyperbolic sub-bin hopper, the No. 2 second coal feeder 12 with one end connected to the bottom outlet of the No. 2 hyperbolic sub-bin hopper and the other end connected to the No. 1 first coal feeder, the No. 2 second coal feeder outlet gate 13 installed on the lower outlet of the No. 2 second coal feeder, and the low-quality coal bunker outlet gate 14 installed on the lower outlet of the low-quality coal bunker.

[0023] In the hyperbolic coal-feeding and power peak-shaving system of the present invention, the high-quality coal feeding bunker, the low-quality coal feeding bunker, the No. 1 hyperbolic coal-feeding bunker, and the No. 2 hyperbolic coal-feeding bunker are all provided with rappers 15 on their bunker walls.

[0024] In the hyperbolic compartment coal-feeding power peak-shaving system of the present invention, the No. 1 hyperbolic compartment hopper and the No. 2 hyperbolic compartment hopper are provided with multiple reinforcing ribs 16 at the transition pipe sections.

[0025] In the hyperbolic compartment coal-feeding and power peak-shaving system of the present invention, the No. 1 hyperbolic compartment hopper and the No. 2 hyperbolic compartment hopper are further provided with a hoisting reinforcement bracket 17 .

[0026] In the hyperbolic compartment coal-feeding and power peak-shaving system of the present invention, the cross-sectional areas of the No. 1 hyperbolic compartment hopper and the No. 2 hyperbolic compartment hopper gradually decrease from top to bottom.

[0027] The hyperbolic compartment coal-feeding and power peak-shaving system of the present invention, wherein the first coal feeder No. 1, the second coal feeder No. 1, the first coal feeder No. 2, and the second coal feeder No. 2 are weighing-type belt frequency-modulated coal feeders, realize accurate material distribution.

[0028] The hyperbolic compartment coal-feeding power peak-shaving system of the present invention, the No. 1 hyperbolic compartment hopper outlet gate, the high-quality coal bunker outlet gate, the No. 1 second coal feeder outlet gate, the No. 2 hyperbolic compartment hopper outlet gate, the No. 2 second coal feeder outlet gate, and the low-quality coal bunker outlet gate are electric or pneumatic two-way gate doors.

[0029] The hyperbolic compartment coal-feeding power peak-shaving system of the present invention is only described above as a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent replacements and improvements made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A hyperbolic coal-feeding power peak-shaving system, characterized in that: It includes a high-quality coal bunker, a No. 1 hyperbolic sub-bin hopper arranged on the side of the high-quality coal bunker, a No. 1 hyperbolic sub-bin hopper outlet gate installed on the lower outlet of the No. 1 hyperbolic sub-bin hopper, a high-quality coal bunker outlet gate installed on the lower outlet of the high-quality coal bunker, a No. 1 first coal feeder connected to the bottom port of the high-quality coal bunker, a No. 1 second coal feeder connected to the bottom port of the No. 1 hyperbolic sub-bin hopper, a No. 1 second coal feeder outlet gate installed on the lower outlet of the No. 1 second coal feeder, and a No. 1 second coal feeder outlet gate connected to the bottom outlet of the No. 1 second coal feeder. The No. 2 first coal feeder, the low-quality coal bunker with its bottom outlet connected to the No. 2 first coal feeder, the No. 2 hyperbolic sub-bin hopper connected to the side of the low-quality coal bunker, the No. 2 hyperbolic sub-bin hopper outlet gate installed on the lower outlet of the No. 2 hyperbolic sub-bin hopper, the No. 2 second coal feeder with one end connected to the bottom outlet of the No. 2 hyperbolic sub-bin hopper and the other end connected to the No. 1 first coal feeder, the No. 2 second coal feeder outlet gate installed on the lower outlet of the No. 2 second coal feeder, and the low-quality coal bunker outlet gate installed on the lower outlet of the low-quality coal bunker.

2. The hyperbolic coal-feeding power peak-shaving system according to claim 1 is characterized in that: The high-quality coal feeding bunker, the low-quality coal feeding bunker, the No. 1 hyperbolic bin hopper, and the No. 2 hyperbolic bin hopper are all provided with vibrators on their bin walls.

3. The hyperbolic coal-feeding power peak-shaving system according to claim 1 is characterized in that: The No. 1 hyperbolic bin hopper and the No. 2 hyperbolic bin hopper are provided with multiple reinforcing ribs at the transition pipe sections.

4. The hyperbolic coal-feeding power peak-shaving system according to claim 1 is characterized in that: The No. 1 hyperbolic bin hopper and the No. 2 hyperbolic bin hopper are also provided with a hoisting reinforcement bracket.

5. The hyperbolic coal-feeding power peak-shaving system according to claim 1 is characterized in that: The cross-sectional areas of the No. 1 hyperbolic bin hopper and the No. 2 hyperbolic bin hopper gradually decrease from top to bottom.

6. The hyperbolic coal-feeding power peak-shaving system according to claim 1 is characterized in that: The No. 1 first coal feeder, No. 1 second coal feeder, No. 2 first coal feeder, and No. 2 second coal feeder are weighing-type belt frequency-modulated coal feeders, which realize precise material distribution.

7. The hyperbolic coal-feeding power peak-shaving system according to claim 1 is characterized in that: The No. 1 hyperbolic bin hopper outlet gate door, high-quality coal bunker outlet gate door, No. 1 second coal feeder outlet gate door, No. 2 hyperbolic bin hopper outlet gate door, No. 2 second coal feeder outlet gate door, and low-quality coal bunker outlet gate door are electric or pneumatic two-way gate doors.

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