Coal storage system for thermal power plant
By dividing the raw coal bunker of a thermal power plant into two compartments and equipping them with gate valves and anti-coal-blocking devices, the problem that thermal power plants can only burn the same type of coal has been solved. This enables rapid switching between superior and inferior coal types and rapid boiler response to variable load conditions, thereby reducing production costs and equipment costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HARBIN POWER SYST ENG & RES INST OF CNEEC
- Filing Date
- 2025-08-27
- Publication Date
- 2026-07-14
AI Technical Summary
The fixed structural design of the raw coal bunker in thermal power plants means that only the same type of coal can be burned, which increases the difficulty and cost of coal procurement. The boilers have poor response to variable load conditions and cannot meet peak-shaving requirements.
A partition is installed inside the raw coal bunker to divide it into two compartments for storing high-quality coal and low-quality coal respectively. Gate valves and anti-blocking devices are also installed to enable rapid switching and monitoring of high-quality and low-quality coal, thereby improving the variable load response capability of the boiler pulverizing system.
It enables rapid adjustment of coal type under different load conditions, reduces procurement costs, improves the boiler's response to variable load conditions, and solves the coal supply problem during peak shaving.
Smart Images
Figure CN224492288U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of thermal power plant equipment, specifically relating to a raw coal bunkering system for thermal power plants. Background Technology
[0002] To adapt to the current coal market, ensure the load-bearing capacity of units under the existing coal supply conditions, and absorb inferior coal in the supply, thereby reducing the limitation of unit load-bearing capacity due to coal supply issues, existing thermal power plant units are required to have the ability to burn different types of coal under different load conditions.
[0003] However, in thermal power plants that have been in operation for many years, the coal loading system is still designed based on the coal type used for initial design and verification. The function of the coal loading system has a certain degree of fixedness, especially the structural design of the raw coal bunker, which has limitations, manifested in the following ways:
[0004] (1) Only the same type of coal can be used under different working conditions and load conditions, which results in the basic fixed requirements for the quality of coal entering the furnace, increasing the difficulty and cost of coal procurement;
[0005] (2) The coal type in the raw coal bunker is unique. The boiler cannot adjust the coal type in time to adapt to the load conditions. The unit cannot accurately change the coal type. The boiler pulverizing system has poor rapid response capability to changing load conditions, which makes it impossible to meet the peak shaving period. In order to shave the peak, high calorific value coal type is replaced, resulting in waste of high calorific value coal and increasing the unit operating cost. Summary of the Invention
[0006] In order to solve the above problems, this utility model provides a raw coal bunkering system for thermal power plants, which modifies the raw coal bunkering system to improve the rapid response capability of the boiler pulverizing system to variable load conditions.
[0007] The technical solution adopted by this utility model is:
[0008] A coal bunkering system for a thermal power plant includes a coal bunker, a partition, a gate valve, and an anti-blocking device. The partition is fixed inside the coal bunker, dividing it into two compartments for storing high-quality coal and low-quality coal, respectively. The upper surfaces of the two compartments have unloading ports for feeding coal, and gate valves are installed at the unloading ports of the two compartments. An anti-blocking device is installed on the coal bunker.
[0009] Furthermore, the partition is made of stainless steel single plate.
[0010] Furthermore, the reinforcing hoops on the outside of the coal bunker are made of stainless steel plates, the walls of the coal bunker are made of stainless steel plates, and the inner walls of the coal bunker are reinforced with transverse support steel pipes.
[0011] Furthermore, the gate valve is an electric bidirectional double-slide gate valve, and the two valve ports of the electric bidirectional double-slide gate valve are respectively set to correspond to the coal outlets of the two compartments of the coal bunker.
[0012] Furthermore, both of the aforementioned compartments are equipped with level gauges to monitor changes in the coal level within the compartments.
[0013] Furthermore, the anti-coal-blocking device comprises multiple bin wall vibrating hammers, which are respectively installed on the outer walls of the two bins and located above the gate valve.
[0014] Furthermore, a pressure-resistant weighing coal feeder is installed at the coal outlet below the coal bunker.
[0015] Compared with the prior art, the present invention has the following advantages:
[0016] 1. This utility model modifies the raw coal bunker by adding a partition in the middle of the existing raw coal bunker, dividing the interior into two parts. One half stores high-quality coal, and the other half stores low-quality coal. Without changing the combustion system, the coal source entering the coal mill can be quickly adjusted to achieve the purpose of rapid switching between high-quality and low-quality coal. This solves the demand for high-quality coal supply when the operating unit is at its peak and the grid dispatching unit is at its rated output, and improves the rapid response capability of the boiler pulverizing system to variable load conditions.
[0017] 2. This utility model is equipped with gate valves at the coal outlets of the two compartments, which can realize the switching between superior and inferior coal types under different loads.
[0018] 3. This utility model is equipped with an anti-coal-blocking device to solve the problems of coal bridging and blockage that may occur in the coal bunker after it is divided into separate compartments. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of this utility model;
[0020] Figure 2 This is a top view of the present invention;
[0021] The components include: 1. Coal bunker; 101. Bunker chamber; 102. Coal unloading port; 2. Partition plate; 3. Reinforcing hoop; 4. Gate valve; 5. Pressure-resistant weighing coal feeder; 6. Anti-coal blockage device; 7. Supporting steel pipe. Detailed Implementation
[0022] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model will be provided below with reference to the accompanying drawings.
[0023] like Figure 1 , Figure 2As shown, this utility model provides a coal bunkering system for a thermal power plant, including a coal bunker 1, a partition 2, a gate valve 4, and an anti-blocking coal device 6. The partition 2 is fixed inside the coal bunker 1, completely dividing the coal bunker 1 into two compartments 101, which are used to store high-quality coal and low-quality coal respectively. The upper surface of each compartment 101 has a coal discharge port 102 for feeding, and a gate valve 4 is installed at the coal discharge port of each compartment 101 to realize the switching between high-quality and low-quality coal under different loads. The anti-blocking coal device 6 is installed on the coal bunker 1.
[0024] The partition 2 is made of stainless steel. The partition 2 matches the internal cross-section of the coal bunker 1, ensuring that the two compartments 101 are independent.
[0025] The partition 2 is welded to the inner wall of the raw coal bunker and has a transverse support steel pipe 7. Before the renovation, the external reinforcing hoop 3 of the raw coal bunker was a channel steel structure. In order to reduce the weight after the renovation, the external reinforcing hoop 3 was replaced with a stainless steel plate. With the internal support steel pipe 7, the structure is stable. Before the renovation, the bunker wall was a carbon steel plate lined with stainless steel. After the renovation, the bunker wall was replaced with a stainless steel plate. After adding the middle partition 2, the overall weight of the raw coal bunker is the same.
[0026] The upper part of coal bunker 1 is square, smoothly transitioning to a circular lower part, and connects to the civil engineering structure beams.
[0027] The gate valve 4 is an electric bidirectional double slide gate valve, and the two valve ports of the electric bidirectional double slide gate valve are respectively set to correspond to the coal outlets of the two compartments 101 of the coal bunker 1.
[0028] The model number of the electric bidirectional double slide gate valve is DZF1000.
[0029] The electric bidirectional double slide gate valve is controlled by a DCS system. An interlocking mechanism is added to the DCS system or the local control box to prevent the two valves from opening simultaneously and causing coal mixing.
[0030] The DCS system of the raw coal bunker has the function of detecting and alarming valve jamming or malfunction.
[0031] Both compartments 101 are equipped with level gauges to monitor changes in the coal level within the compartments 101. High level, low level, and continuous level monitoring are performed in each compartment 101, and control points are added to the DCS system.
[0032] The anti-blocking coal device 6 consists of multiple bin wall vibrating hammers, which are installed on the outer walls of the two bins 101 and located above the gate valve 4.
[0033] The bin wall vibratory hammer can be controlled locally via a local control box, and also has a remote automatic control function, that is, it will automatically start when a coal blockage signal is detected (such as abnormal level gauge signal or coal feeder stop signal).
[0034] A pressure-resistant weighing coal feeder 5 is installed at the coal outlet below the coal bunker 1.
[0035] Two conveyor belts transport high-quality coal and low-quality coal to two separate compartments, 101, respectively. The choice between high-quality and low-quality coal is determined manually based on peak-shaving requirements.
[0036] Coal bunker 1 has a certain storage capacity. When high-quality / low-quality coal is needed, the corresponding valve in the electric bidirectional double-slide gate valve is activated. Depending on the material level in bunker 101 and the required amount of high-quality / low-quality coal, the horizontal conveyor belt in bunker 1 and the main plant conveyor belt are then activated sequentially for each section of the coal feeding conveyor belt.
[0037] The lower part of compartment 101 is controlled by an electric bidirectional double-slot gate, which controls the coal in the two compartments 101 to enter the pressure-resistant weighing coal feeder 5.
[0038] One valve in the electric bidirectional double slide gate valve is open, while the other valve is closed, and the coal enters the boiler or coal mill via the pressure-resistant weighing feeder 5.
[0039] The amount of coal is controlled by the pressure-resistant weighing coal feeder 5 and the DCS. Only one additional control channel is added. Before the modification, the gate valve had one open / close channel, and after the modification, it has two open / close channels. The two small coal bunkers 1 contain high-quality coal and low-quality coal respectively. The coal is fed into the pressure-resistant weighing coal feeder 5 by two valves of the electric bidirectional double slide gate valve. According to the unit's peak-shaving requirements, instructions are issued manually through the DCS.
[0040] When a coal blockage signal is detected, such as an abnormal level gauge signal or a coal feeder cut-off signal, the bin wall vibratory hammer will start automatically. It can also be manually controlled locally from the local control box.
[0041] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.
Claims
1. A coal bunkering system for a thermal power plant, characterized in that: It includes a coal bunker (1), a partition (2), a gate valve (4), and an anti-blocking coal device (6); the partition (2) is fixed inside the coal bunker (1) and divides the coal bunker (1) into two compartments (101), which are used to store high-quality coal and low-quality coal respectively. The upper surface of the two compartments (101) is opened with a coal discharge port (102) for feeding respectively, and a gate valve (4) is installed at the coal discharge port of the two compartments (101). An anti-blocking coal device (6) is installed on the coal bunker (1).
2. The coal bunkering system for thermal power plants according to claim 1, characterized in that: The partition (2) is made of stainless steel single plate.
3. The coal bunkering system for thermal power plants according to claim 2, characterized in that: The reinforcing hoop (3) outside the coal bunker (1) is made of stainless steel plate, the bunker wall of the coal bunker (1) is made of stainless steel plate, and the inner wall of the coal bunker (1) is provided with transverse support steel pipe (7).
4. The coal bunkering system for thermal power plants according to claim 2, characterized in that: The gate valve (4) is an electric bidirectional double gate valve, and the two valve ports of the electric bidirectional double gate valve are respectively set to the coal outlets of the two compartments (101) of the coal bunker (1).
5. The coal bunkering system for thermal power plants according to claim 1, characterized in that: Both of the aforementioned compartments (101) are equipped with level gauges to monitor changes in the coal level within the compartments (101).
6. The coal bunkering system for thermal power plants according to claim 5, characterized in that: The anti-blocking coal device (6) consists of multiple bin wall vibrating hammers, which are installed on the outer walls of two bins (101) and located above the gate valve (4).
7. The coal bunkering system for thermal power plants according to claim 6, characterized in that: A pressure-resistant weighing coal feeder (5) is installed at the coal outlet below the coal bunker (1).