A double-bunker intercommunication crossing coal blending mechanism for raw coal bunker

Abstract

The utility model relates to a kind of original coal bin double bin intercommunication cross coal blending mechanism, including bin body assembly, feeding assembly, and cross conveying assembly, original coal bin is formed left sub-bin and right sub-bin by mid-parting wall separation, store different coal, two sub-bins are respectively connected two conical hoppers, conical hopper bottom is provided with central feeder and is connected corresponding coal feeder, the cross conveying assembly includes two cross-arranged screw conveyors, its feed end is arranged in conical hopper interior, upper installation feed gate, its discharge end is connected to the inlet of opposite coal feeder by coal drop pipe, and is installed with discharge gate, so that the coal of two conical hoppers can be exchanged and transported to opposite coal feeder. The utility model can realize intercommunication and blending control of coal between two sub-bins by the combination operation mode of screw conveyor and central feeder, so as to realize the quick switching and blending of different coal, with good reliability and maintainability, suitable for coal-fired system with multiple coal supply requirements.

Description

Technical Field

[0001] This utility model relates to the field of coal feeding technology, specifically to a cross-connection coal distribution mechanism for two raw coal bunkers. Background Technology

[0002] In the field of thermal power generation, raw coal bunkers, as core facilities for coal storage and supply, directly affect boiler efficiency and equipment operational stability. Traditional raw coal bunkers mostly adopt a single storage and single coal supply channel design. With the popularization of coal blending technology and the increasing requirements of the power grid system for the deep peak-shaving and flexible operation capabilities of thermal power units, boilers have placed higher demands on the stability of the coal quality entering the furnace and the control of blending ratios. The single-bunker coal supply mode can no longer meet the needs of switching between multiple coal types and dynamic blending.

[0003] To reduce the peak capacity assessment of generating units, increase the amount of low-quality coal blended, and improve the flexibility of adjusting the calorific value of coal fed into the furnace, it is necessary to carry out coal quality quick-cut technology transformation on the existing raw coal bunkers and design a new type of coal bunker structure with flexible functions that can realize bidirectional coal blending and interconnection, so that thermal power plants can regain their advantage in the fierce market competition. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, this utility model provides a cross-connection coal blending mechanism for a dual-compartment raw coal bunker, solving the problem that the coal conveying system cannot switch coal types in real time and flexibly blend coal for combustion when the load of a coal-fired power unit is adjusted. A screw conveyor is used to cross-transport coal types from the two cone hoppers of the raw coal bunker, and different coal types are mixed in proportion by controlling the opening and closing of the gate valve, meeting the requirements of multi-coal supply and flexible control of the boiler.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A cross-connection coal distribution mechanism for a dual-compartment raw coal bunker, characterized in that it comprises:

[0007] The silo assembly includes a left compartment and a right compartment separated by a central partition wall, which store different types of coal respectively. The bottom of the left compartment is connected to a first cone hopper, and the bottom of the right compartment is connected to a second cone hopper. The first cone hopper and the second cone hopper are each equipped with an independent discharge channel.

[0008] The feeding assembly includes a first central feeder disposed at the bottom of a first cone hopper and a second central feeder disposed at the bottom of a second cone hopper. A first coal feeder is connected below the first central feeder, and a second coal feeder is connected below the second central feeder.

[0009] The cross-conveying assembly includes a gate valve, a screw conveyor, and a coal drop pipe. The feed end of the first screw conveyor is located inside the first cone hopper, and a first feed gate valve is installed above it. The discharge end of the first screw conveyor is connected to the feed inlet of the second coal feeder through the first coal drop pipe, and a first discharge gate valve is installed thereon. The feed end of the second screw conveyor is located inside the second cone hopper, and a second feed gate valve is installed above it. The discharge end of the second screw conveyor is connected to the feed inlet of the first coal feeder through the second coal drop pipe, and a second discharge gate valve is installed thereon. The first and second screw conveyors are arranged crosswise, forming a material path where the coal in the two cone hoppers can be exchanged and transported to the coal feeder on the opposite side.

[0010] The first and second screw conveyors each include blades, thrust bearings, gravity bearings, couplings, reducers, and motors arranged axially. The output end of the motor is connected to the reducer, and the reducer is connected to the thrust bearings and gravity bearings via the coupling. The blades are fixedly sleeved on the screw shaft and are connected to the thrust bearings and gravity bearings, forming a transmission chain in which the motor drives the blades to rotate sequentially through the reducer, coupling, thrust bearings, and gravity bearings, thereby realizing the directional transport of coal within the screw conveyor.

[0011] The installation height of the first screw conveyor and the installation height of the second screw conveyor form a height difference, which ranges from 300 to 800 mm.

[0012] The central partition wall is composed of H-shaped steel beams and sealing plates. The H-shaped steel beams are arranged at intervals in the vertical direction, and their two ends are welded and fixed to the side wall of the raw coal bunker. The sealing plates are welded to both sides of the H-shaped steel beams to form a sealed isolation surface.

[0013] The cross conveyor assembly includes a maintenance platform located below it. The maintenance platform has a maintenance channel parallel to the axis of the screw conveyor, and the channel width is not less than 800mm.

[0014] When the first central feeder, the first screw conveyor, the first inlet gate, and the first outlet gate are in the open state, and the second central feeder, the second screw conveyor, the second inlet gate, and the second outlet gate are in the closed state, the coal in the left compartment is diverted to the first central feeder and the first screw conveyor via the first cone bucket. The coal conveyed by the first central feeder enters the first coal feeder below, and the coal conveyed by the first screw conveyor enters the second coal feeder through the first coal drop pipe driven by the blades. The two coal feeders output the coal type from the left compartment simultaneously.

[0015] The junction of the silo assembly and the cross conveyor assembly is provided with a sealing structure consisting of an elastic sealing ring and a wear-resistant liner.

[0016] This includes an electrical control system, which is electrically connected to the screw conveyor, gate valve, and central feeder to achieve remote synchronous control.

[0017] By adopting the above technical solution, the beneficial effects obtained by this utility model are:

[0018] Two staggered screw conveyors cross-transport coal from two cone-shaped hoppers in the raw coal bunker. The screw conveyors and the central feeder can work independently or collaboratively, with quantitative proportioning control implemented by the electrical control system. The modified raw coal bunker is divided into two sections: the first cone-shaped hopper contains high-calorific-value coal, and the second cone-shaped hopper contains low-calorific-value coal. When full-load or high-load power generation is required, the first screw conveyor is activated and the second central feeder is shut down, with both feeders simultaneously supplying high-calorific-value coal from the first cone-shaped hopper to the boiler. Conversely, after peak periods and when load levels decrease, both feeders can simultaneously supply low-calorific-value coal to the boiler, or a certain proportion of low-calorific-value coal can be blended by controlling the opening of the gate valve to reduce fuel costs.

[0019] The present invention will now be described in detail with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a dual-compartment interconnected cross-coal distribution mechanism for raw coal bunkers according to this utility model.

[0021] Figure 2 This is a side view of a dual-compartment interconnected cross-coal distribution mechanism for raw coal bunkers according to this utility model.

[0022] Figure 3 This is a top view of a dual-compartment interconnected cross-coal distribution mechanism for raw coal bunkers according to this utility model.

[0023] In the diagram: 1-First cone bucket; 2-Second cone bucket; 3-First feed gate; 4-Second feed gate; 5-First central feeder; 6-Second central feeder; 7-First screw conveyor; 71-Blade; 72-Thrust and gravity bearings; 73-Coupling; 74-Reducer; 75-Motor; 8-Second screw conveyor; 9-First coal drop pipe; 10-Second coal drop pipe; 11-First discharge gate; 12-Second discharge gate; 13-First coal feeder; 14-Second coal feeder; 15-H-beam; 16-Sealing plate; 17-Maintenance platform; Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] like Figure 1As shown, a dual-compartment interconnected cross-coal distribution mechanism for raw coal bunkers is characterized by comprising a bunker body assembly, a feeding assembly, and a cross-conveying assembly.

[0026] like Figure 1 As shown, the silo assembly includes a left compartment and a right compartment formed by a central partition wall, which store different types of coal respectively. The bottom of the left compartment is connected to a first cone hopper 1, and the bottom of the right compartment is connected to a second cone hopper 2. The first cone hopper 1 and the second cone hopper 2 are respectively equipped with independent discharge channels.

[0027] like Figure 1 As shown, the feeding assembly includes a first central feeder 5 disposed at the bottom of the first cone hopper 1 and a second central feeder 6 disposed at the bottom of the second cone hopper 2. The first central feeder 5 is connected to a first coal feeder 13 below, and the second central feeder 6 is connected to a second coal feeder 14 below.

[0028] like Figure 1 As shown, the cross-conveying assembly includes a gate, a screw conveyor, and a coal drop pipe. The feed end of the first screw conveyor 7 is located inside the first cone hopper 1, and a first feed gate 3 is installed above it. The discharge end of the first screw conveyor 7 is connected to the feed inlet of the second coal feeder 14 through the first coal drop pipe 9, and a first discharge gate 11 is installed there. The feed end of the second screw conveyor 8 is located inside the second cone hopper 2, and a second feed gate 4 is installed above it. The discharge end of the second screw conveyor 8 is connected to the feed inlet of the first coal feeder 13 through the second coal drop pipe 10, and a second discharge gate 12 is installed there. The first screw conveyor 7 and the second screw conveyor 8 are arranged in a cross configuration, forming a material path where the coal in the two cone hoppers can be exchanged and transported to the opposite coal feeder.

[0029] In one embodiment of this utility model, both the first screw conveyor 7 and the second screw conveyor 8 include blades 71 arranged axially, thrust and gravity bearings 72, couplings 73, reducers 74, and motors 75. The output end of the motor 75 is connected to the reducer 74. The reducer 74 is axially connected to the thrust and gravity bearings 72 via the couplings 73. The blades 71 are fixedly sleeved on the screw shaft, made of high-hardness and wear-resistant material, and are connected to the thrust and gravity bearings 72, forming a transmission chain in which the motor 75 drives the blades 71 to rotate sequentially through the reducer 74, couplings 73, thrust and gravity bearings 72, thereby realizing the directional transport of coal in the screw conveyor.

[0030] In one embodiment of this utility model, the installation height of the first screw conveyor 7 and the installation height of the second screw conveyor 8 form a height difference, which ranges from 300 to 800 mm.

[0031] In one embodiment of this utility model, the partition wall is composed of H-shaped steel beams 15 and sealing plates 16. The H-shaped steel beams 15 are arranged at intervals in the vertical direction, and their two ends are welded and fixed to the side wall of the raw coal bunker. The sealing plates 16 are welded to both sides of the H-shaped steel beams 15 to form a sealed isolation surface.

[0032] In one embodiment of the present invention, a maintenance platform 17 is provided below the cross conveyor assembly. The maintenance platform 17 is provided with a maintenance channel parallel to the axis of the screw conveyor, and the channel width is not less than 800mm.

[0033] In one embodiment of this utility model, when the first central feeder 5, the first screw conveyor 7, the first feed gate 3, and the first discharge gate 11 are in the open state, and the second central feeder 6, the second screw conveyor 8, the second feed gate 4, and the second discharge gate 12 are in the closed state, the coal in the left compartment is diverted to the first central feeder 5 and the first screw conveyor 7 via the first cone hopper 1. The coal conveyed by the first central feeder 5 enters the first coal feeder 13 below, and the coal conveyed by the first screw conveyor 7 enters the second coal feeder 14 through the first coal drop pipe 9 under the drive of the blades 71. The two coal feeders output the coal type of the left compartment synchronously.

[0034] In one embodiment of this utility model, the joint between the hopper assembly and the cross conveying assembly is provided with a sealing structure consisting of an elastic sealing ring and a wear-resistant liner.

[0035] In one embodiment of this utility model, an electrical control system is included. The electrical control system is electrically connected to the screw conveyor, the gate valve, and the central feeder to achieve remote synchronous control. The screw conveyor and the central feeder can work independently or in coordination and can perform quantitative proportion control, which is suitable for coal blending needs under different loads.

[0036] In summary, the dual-compartment interconnected cross-coal distribution mechanism for raw coal bunkers of this utility model has the following advantages: Two cross-arranged screw conveyors cross-transport coal from the two cone hoppers of the raw coal bunker. The screw conveyors and the central feeder can operate independently or collaboratively along dual paths, and with the help of the electrical control system, quantitative proportioning control can be achieved to meet coal scheduling requirements under different operating conditions. The modified raw coal bunker is divided into two parts: the first cone hopper contains high-calorific-value coal, and the second cone hopper contains low-calorific-value coal. When full-load or high-load power generation is required, the first screw conveyor is activated and the second central feeder is deactivated, with both feeders simultaneously supplying high-calorific-value coal from the first cone hopper to the boiler. Conversely, when the peak period has passed and the load level has decreased, both feeders can simultaneously supply low-calorific-value coal to the boiler, or a certain proportion of low-calorific-value coal can be blended by controlling the opening of the gate valve, thus reducing fuel costs. The dual-compartment interconnected cross-coal distribution mechanism for raw coal bunkers of this utility model has a compact structure, requires little space, is easy to modify and maintain, and is suitable for precise combustion control of boilers, improving the operating efficiency of coal-fired systems.

[0037] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A double-bunker intercommunication crossing coal blending mechanism for raw coal bunker, characterized in that, include: The silo assembly includes a left compartment and a right compartment separated by a central partition wall, which store different types of coal respectively. The bottom of the left compartment is connected to a first cone hopper (1), and the bottom of the right compartment is connected to a second cone hopper (2). The first cone hopper (1) and the second cone hopper (2) are respectively equipped with independent discharge channels. The feeding assembly includes a first central feeder (5) disposed at the bottom of the first cone hopper (1) and a second central feeder (6) disposed at the bottom of the second cone hopper (2). The first central feeder (5) is connected to a first coal feeder (13) below, and the second central feeder (6) is connected to a second coal feeder (14) below. The cross-conveying assembly includes a gate, a screw conveyor, and a coal drop pipe. The feed end of the first screw conveyor (7) is located inside the first cone hopper (1), and a first feed gate (3) is installed above it. The discharge end of the first screw conveyor (7) is connected to the inlet of the second coal feeder (14) through the first coal drop pipe (9), and a first discharge gate (11) is installed thereon. The feed end of the second screw conveyor (8) is located inside the second cone hopper (2), and a second feed gate (4) is installed above it. The discharge end of the second screw conveyor (8) is connected to the inlet of the first coal feeder (13) through the second coal drop pipe (10), and a second discharge gate (12) is installed thereon. The first screw conveyor (7) and the second screw conveyor (8) are arranged in a cross configuration, forming a material path where the coal in the two cone hoppers can be exchanged and transported to the coal feeder on the opposite side.

2. The double-bunker intercommunication cross coal blending mechanism for raw coal bunker according to claim 1, characterized in that, Both the first screw conveyor (7) and the second screw conveyor (8) include blades (71) arranged along the axial direction, thrust and gravity bearings (72), couplings (73), reducers (74) and motors (75). The output end of the motor (75) is connected to the reducer (74) for transmission. The reducer (74) is connected to the thrust and gravity bearings (72) through the couplings (73). The blades (71) are fixedly sleeved on the screw shaft and are connected to the thrust and gravity bearings (72) for transmission, forming a transmission chain in which the motor (75) drives the blades (71) to rotate in sequence through the reducer (74), couplings (73), and thrust and gravity bearings (72), thereby realizing the directional transmission of coal in the screw conveyor.

3. The double-bunker intercommunication cross coal blending mechanism for raw coal bunker according to claim 1, characterized in that, The installation height of the first screw conveyor (7) and the installation height of the second screw conveyor (8) form a height difference, which ranges from 300 to 800 mm.

4. The double-bunker intercommunication cross coal blending mechanism for raw coal bunker according to claim 1, characterized in that, The partition wall consists of H-shaped steel beams (15) and sealing plates (16). The H-shaped steel beams (15) are arranged at intervals along the vertical direction, and their two ends are welded and fixed to the side wall of the raw coal bunker. The sealing plates (16) are welded to both sides of the H-shaped steel beams (15) to form a sealed isolation surface.

5. The double-bunker intercommunication cross blending mechanism of raw coal bunker according to claim 1, characterized in that, A maintenance platform (17) is provided below the cross conveyor assembly. The maintenance platform (17) has a maintenance channel parallel to the axis of the screw conveyor, and the channel width is not less than 800mm.

6. The double-bunker intercommunication cross coal blending mechanism of raw coal bunker according to claim 1, characterized in that, When the first central feeder (5), the first screw conveyor (7), the first feed gate (3) and the first discharge gate (11) are in the open state, and the second central feeder (6), the second screw conveyor (8), the second feed gate (4) and the second discharge gate (12) are in the closed state, the coal in the left compartment is diverted to the first central feeder (5) and the first screw conveyor (7) through the first cone bucket (1). The coal conveyed by the first central feeder (5) enters the first coal feeder (13) below, and the coal conveyed by the first screw conveyor (7) enters the second coal feeder (14) through the first coal drop pipe (9) driven by the blades (71). The two coal feeders output the coal in the left compartment simultaneously.

7. The double-bunker intercommunication cross coal blending mechanism of raw coal bunker according to claim 1, characterized in that, The junctions between the hopper assembly and the cross-conveying assembly are each provided with a sealing structure consisting of an elastic sealing ring and a wear-resistant liner.

8. The double-bunker intercommunication cross coal blending mechanism of raw coal bunker according to claim 1, characterized in that, It also includes an electrical control system, which is electrically connected to the screw conveyor, gate valve and central feeder to achieve remote synchronous control.

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