Boiler water-cooled ash discharge device and boiler water-cooled ash discharge system
The water-cooled ash discharge system addresses the issues of deformation and corrosion in screw conveyors by using inclined water-cooled walls and a flip valve with a cooling system and cleaning mechanisms, ensuring reliable and easy-to-maintain ash discharge.
Patent Information
- Application Number
- CN202421802611.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-07-29
AI Technical Summary
In the existing boiler structure, the screw conveyor is prone to deform and corrosion under high temperature environments, resulting in frequent failure of the ash discharge system and affecting normal operation.
Water-cooled ash discharge device is adopted, including water-cooled ash coupling device, ash discharge device and a cooling water delivery system. It uses water-cooled walls and cooling water to circulate and cool down, and is equipped with a vibration and purge mechanism to prevent ash slag from being blocked.
It improves the reliability and maintenance of the boiler ash discharge system, reduces damage to mechanical components, prevents ash discharge from being blocked, and ensures stable operation of the equipment.
Smart Images
Figure CN223106064U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of boiler equipment, relates to a boiler equipment, and particularly relates to a boiler water-cooled ash discharging device and a boiler water-cooled ash discharging system. Background Art
[0002] At present, the bottom ash discharge of the boiler body of a conventional incineration line usually uses a screw conveyor. The slag is conveyed to the end of the machine head and discharged by rotating through the driving force.
[0003] Since the ash discharge temperature in the furnace is relatively high (500 - 700 °C), the screw conveyor adopts a water-cooling method to cool the jacket and the internal mechanism. To ensure normal cooling water exchange, the cooling water requires a certain pressure. Usually, the pressure in the jacket is about 4 bar. Generally, the jacket and the internal mechanism of the conveyor are welded with steel plates and circularly welded, and are extremely prone to deformation and damage under the action of an internal pressure of 4 bar. The water pressure in the cavity acts on the cavity wall plate with a force of several tons, and the force conduction causes weak parts such as corner welds, flanging or poor heat treatment, etc., and is extremely prone to structural distortion and tearing. The screw is installed at the lower opening of the furnace. When the temperature is high and the inner wall of the water-cooled jacket expands due to the force, it is very easy to touch the screw blade body, which further promotes the blade to scrape the inner wall and leak water or directly cause the screw to stop running. The ash and slag in the furnace are highly corrosive and have great destructive power to the screw, and are extremely prone to cause corrosion of the jacket and the welding points. These factors are all prone to cause internal water leakage. After the water leakage, the ash and slag are coked, blocking the slag discharge port and causing the screw to stop running, thus resulting in furnace shutdown for maintenance.
[0004] In view of this, there is an urgent need to design a new boiler structure today to overcome at least some of the above-mentioned defects existing in the existing boiler structure. Content of the Utility Model
[0005] The utility model provides a boiler water-cooled ash discharging device and a boiler water-cooled ash discharging system, which are easy to disassemble and assemble, have strong maintainability, and can effectively prevent boiler ash discharge blockage.
[0006] To solve the above technical problems, according to one aspect of the utility model, the following technical solution is adopted:
[0007] A boiler water-cooled ash discharging device, the boiler water-cooled ash discharging device includes: a water-cooled ash receiving device, a ash discharging device, and a cooling water conveying system;
[0008] The water-cooled ash receiving device is provided with a hopper with an inverted trapezoidal cross-section; the hopper includes a plurality of water-cooled walls, and each water-cooled wall is internally provided with a water-cooling flow channel;
[0009] The water-cooled wall is provided with at least one water inlet and at least one water outlet, and the water-cooling flow channels are respectively connected to each water inlet and each water outlet;
[0010] The ash discharging device is connected to the water-cooled ash receiving device and is arranged below the water-cooled ash receiving device; the ash discharging device is provided with a flap valve.
[0011] Part or all of the water-cooled walls of the hopper are inclined; the included angle between the inclined water-cooled wall and the horizontal plane is greater than the maximum stacking angle of the corresponding dry furnace ash.
[0012] The cooling water delivery system includes a cooling water delivery pipeline, a number of first pipelines, a number of second pipelines and a return water pipeline; the cooling water delivery pipeline is respectively connected to the first ends of each first pipeline, and the second ends of each first pipeline are connected to the water inlets of the corresponding water-cooled walls; the water outlets of the water-cooled walls are connected to the first ends of the corresponding second pipelines, and the second ends of the second pipelines are connected to the return water pipeline.
[0013] The cooling water delivery pipeline, each first pipeline, each second pipeline and the return water pipeline are respectively provided with a solenoid valve, a flow meter and a temperature sensing mechanism.
[0014] As an embodiment of the present invention, the hopper includes two first water-cooled walls longitudinally arranged in an inverted isosceles trapezoid shape and two second water-cooled walls inclined in a rectangular shape; the two first water-cooled walls are arranged in parallel, and the inclination angle of the two second water-cooled walls is greater than or equal to 60°.
[0015] As an embodiment of the present invention, at least one first observation port and at least one ash cleaning port are respectively arranged at the bottom of the water-cooled ash receiving device; the ash discharging device is provided with at least one second observation port.
[0016] As an embodiment of the present invention, the flap valve is a double pneumatic flap valve; a vibration mechanism is arranged in the hopper.
[0017] As an embodiment of the present invention, the boiler water-cooled ash discharging device includes a number of water-cooled boiler ash discharging mechanisms arranged side by side; each water-cooled boiler ash discharging mechanism includes the above-mentioned water-cooled ash receiving device and ash discharging device.
[0018] As an embodiment of the present invention, at least one compressed air purge port is arranged on the water-cooled wall of the hopper, and each compressed air purge port is connected to a compressed air purge device, and the compressed air purge device can deliver compressed air to each compressed air purge port to purge the positions prone to ash accumulation.
[0019] As an embodiment of the present invention, the ash discharging device is provided with a cleaning interface, which can be connected to a cleaning mechanism to receive the cleaning medium conveyed by the cleaning mechanism to clean the ash discharging device.
[0020] According to another aspect of the present invention, the following technical solution is adopted: a boiler water-cooled ash discharging system, the boiler water-cooled ash discharging system includes a boiler water-cooled ash discharging device and a cooling water delivery system.
[0021] The boiler water-cooled ash discharging device includes: a water-cooled ash receiving device and an ash discharging device; the water-cooled ash receiving device is provided with a hopper with an inverted trapezoidal cross-section; the hopper includes a plurality of water walls, and each water wall is internally provided with a water-cooled flow channel;
[0022] Each water wall is provided with at least one water inlet and at least one water outlet, and the water-cooled flow channels are respectively connected to each water inlet and each water outlet; the ash discharging device is connected to the water-cooled ash receiving device and is arranged below the water-cooled ash receiving device; the ash discharging device is provided with a flap valve;
[0023] The cooling water conveying system includes a cooling water conveying pipeline, a plurality of first pipelines, a plurality of second pipelines and a return water pipeline; the cooling water conveying pipeline is respectively connected to the first ends of each first pipeline, and the second ends of each first pipeline are connected to the water inlets of the corresponding water walls; the water outlets of the water walls are connected to the first ends of the corresponding second pipelines, and the second ends of the second pipelines are connected to the return water pipeline;
[0024] The cooling water conveying pipeline, each first pipeline, each second pipeline and the return water pipeline are respectively provided with a solenoid valve, a flow meter and a temperature sensing mechanism.
[0025] As an implementation mode of the present invention, the cooling water conveying system is a circulating cooling water system, and the circulating cooling water system circulates and conveys the cooling water; the circulating cooling water system is provided with a blowdown valve;
[0026] The boiler water-cooled ash discharging system further includes a compressed air purging device and a cleaning mechanism;
[0027] The compressed air purging device is connected to the compressed air purging ports arranged on the water walls, conveys compressed air to each compressed air purging port, and can purge the positions prone to ash accumulation;
[0028] The cleaning mechanism is connected to the cleaning interface arranged on the ash discharging device, and can convey a cleaning medium into the cleaning interface to clean the ash discharging device.
[0029] The beneficial effects of the present invention are as follows: The boiler water-cooled ash discharging device and the boiler water-cooled ash discharging system proposed by the present invention have strong equipment reliability and maintainability, are convenient to use, and are easy to disassemble and assemble.
[0030] The surface of the present invention is cooled by a water-cooled jacket, which is safe and easy to maintain; there is no moving device except the flap valve, and the mechanical components are not easily damaged; in addition, the device is equipped with a vibration and purging mechanism, which can effectively prevent the boiler ash discharge from being blocked. Description of the Drawings
[0031] Figure 1 It is a schematic structural diagram of the boiler water-cooled ash discharging device in an embodiment of the present invention.
[0032] Figure 2 This is a schematic structural diagram of the boiler water-cooled ash discharging device in an embodiment of the present utility model.
[0033] Figure 3 This is a schematic structural diagram of the boiler water-cooled ash discharging device in an embodiment of the present utility model.
[0034] Figure 4 This is a schematic composition diagram of the cooling water conveying system in an embodiment of the present utility model. Specific embodiments
[0035] The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
[0036] In order to further understand the present utility model, the preferred implementation schemes of the present utility model will be described below in conjunction with embodiments. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present utility model, rather than limiting the claims of the present utility model.
[0037] The description of this part only focuses on several typical embodiments, and the present utility model is not limited to the scope described in the embodiments. The mutual replacement of the same or similar prior art means and some technical features in the embodiments is also within the scope of the description and protection of the present utility model.
[0038] "Connection" in the specification includes both direct connection and indirect connection.
[0039] The present utility model discloses a boiler water-cooled ash discharging device. Figures 1 to 3 This is a schematic structural diagram of the boiler water-cooled ash discharging device in an embodiment of the present utility model; please refer to Figures 1 to 3 , the boiler water-cooled ash discharging device includes: a water-cooled ash receiving device 1, a ash discharging device 2 and a cooling water conveying system.
[0040] The water-cooled ash receiving device 1 is provided with a hopper 11 with an inverted trapezoidal cross-section; the hopper 11 includes a plurality of water-cooled walls 12, and each water-cooled wall 12 is internally provided with a water-cooled flow channel; the water-cooled wall 12 is provided with at least one water inlet and at least one water outlet, and the water-cooled flow channels are respectively connected to each water inlet and each water outlet. The water-cooled flow channels of each water-cooled wall 12 can be independent structures. The ash discharging device 2 is connected to the water-cooled ash receiving device 1 and is arranged below the water-cooled ash receiving device 1; the ash discharging device 2 is provided with a flap valve.
[0041] In an embodiment of the present utility model, part or all of the water-cooled walls 12 of the hopper 11 are inclined; the included angle between the inclined water-cooled wall 12 and the horizontal plane is greater than the maximum stacking angle of the corresponding dry furnace ash (determined according to the surface friction coefficient of the furnace ash). In an embodiment, the hopper 11 includes two first water-cooled walls 13 longitudinally arranged in an inverted isosceles trapezoid and two second water-cooled walls 14 inclined and arranged in a rectangle; the two first water-cooled walls 13 are arranged in parallel, and the inclination angle of the two second water-cooled walls 14 is greater than or equal to 60°. Through the above structural design, it is ensured that the furnace ash can be directly discharged under natural conditions, the temperature of the ash slag is minimized, and the impact on the operating environment is reduced at the same time.
[0042] Figure 4 Schematic diagram of the composition of the cooling water conveying system in an embodiment of the present utility model; please refer to Figure 4 , the cooling water conveying system includes a cooling water conveying pipeline, several first pipelines, several second pipelines and a return water pipeline. The cooling water conveying pipeline is respectively connected to the first ends of each first pipeline, and the second ends of each first pipeline are connected to the water inlet of the corresponding water-cooled wall 12; the water outlet of the water-cooled wall 12 is connected to the first end of the corresponding second pipeline, and the second end of the second pipeline is connected to the return water pipeline. The cooling water conveying pipeline, each first pipeline, each second pipeline and the return water pipeline are respectively provided with solenoid valves, flow meters and temperature sensing mechanisms, which can be used to detect and judge the ash accumulation position.
[0043] In an embodiment of the present utility model, at least one first observation port 15 and at least one ash cleaning port 16 are respectively arranged at the bottom of the water-cooled ash receiving device 1. The flap valve is a double pneumatic flap valve; it can not only ensure smooth ash falling, but also ensure that the furnace is not directly connected to the outside atmosphere, avoiding boiler pressure fluctuations. The ash discharging device is provided with at least one second observation port 17. A vibration mechanism 19 is arranged in the hopper 11.
[0044] In an embodiment of the present utility model, at least one compressed air purging port 18 can be arranged on part or all of the water-cooled walls 12 of the hopper 11, and each compressed air purging port 18 is connected to a compressed air purging device, and the compressed air purging device can convey compressed air to each compressed air purging port 18 and can purge the positions where ash is likely to accumulate. In addition, several reinforcing ribs 20 can be arranged on the water-cooled wall 12 to increase the strength of the water-cooled wall 12.
[0045] The ash discharging device 2 is provided with a cleaning interface 21, which can be connected to a cleaning mechanism to receive the cleaning medium conveyed by the cleaning mechanism and clean the inside of the ash discharging device 2.
[0046] The boiler water-cooled ash discharging device includes several water-cooled boiler ash discharging mechanisms arranged side by side, and each water-cooled boiler ash discharging mechanism includes the above-mentioned water-cooled ash receiving device and ash discharging device; for example, a scheme of arranging two water-cooled boiler ash discharging mechanisms as a group can be adopted.
[0047] The present utility model further discloses a boiler water-cooled ash discharging system, which includes the above-mentioned boiler water-cooled ash discharging device and a cooling water conveying system.
[0048] The cooling water conveying system includes a cooling water conveying pipeline, a plurality of first pipelines, a plurality of second pipelines and a return water pipeline; the cooling water conveying pipeline is respectively connected to the first ends of each first pipeline, and the second ends of each first pipeline are connected to the water inlets of the corresponding water walls; the water outlets of the water walls are connected to the first ends of the corresponding second pipelines, and the second ends of the second pipelines are connected to the return water pipeline. Solenoid valves, flow meters and temperature sensing mechanisms are respectively provided on the cooling water conveying pipeline, each first pipeline, each second pipeline and the return water pipeline.
[0049] In an embodiment of the present utility model, the cooling water conveying system is a circulating cooling water system, and the boiler water-cooled ash discharging device does not need to be provided with a separate water pump; the circulating cooling water system circulates and conveys the cooling water; the circulating cooling water system is provided with a blowdown valve for regular blowdown.
[0050] In addition, the boiler water-cooled ash discharging system further includes a compressed air purging device and a cleaning mechanism. The compressed air purging device is connected to the compressed air purging ports provided on the water walls to convey compressed air to each compressed air purging port, and can purge the positions where ash is likely to accumulate. The cleaning mechanism is connected to the cleaning interface of the ash discharging device and can convey a cleaning medium into the cleaning interface to clean the ash discharging device.
[0051] Correspondingly, the boiler water-cooled ash discharging system may further include a main control device, which is respectively connected to the solenoid valve, the flow meter and the temperature sensing mechanism, receives the data sensed by the flow meter and the temperature sensing mechanism, and controls the corresponding solenoid valve to work according to the received data.
[0052] In a use scenario of the present utility model, the boiler water-cooled ash discharging device can be divided into four major parts: a main body jacket assembly, a flap valve device, a slag discharge pipe and a pipeline system.
[0053] Among them, the main body jacket assembly is the main structure and is composed of a pair of completely symmetrical independent water-cooled ash discharging devices. Each water-cooled ash discharging device is fixedly connected to the bottom surface of the furnace body expansion joint through bolts. Each water-cooled ash discharging device is divided into four independent surface components, which are fixedly spliced on-site by bolts. The four jacket surfaces of each independent water-cooled ash discharging device can be divided into a surface jacket and a side jacket, and both are provided with cooling water interfaces with independent inlets and outlets.
[0054] An observation hole is provided below the surface component (jacket). Considering the light transmission requirements, it should be provided on both the front and back sides. A dust cleaning hole is provided below the side component (jacket) at a position close to the observation hole, which can be used for dust cleaning during shutdown or online. The dust cleaning hole is designed with unequal heights to facilitate expanding the operation range. A vibration motor base is pre-welded at the position of the jacket body above the observation port of the surface component (jacket) for online vibration dust cleaning. In addition, compressed air purging ports are installed on the side water-cooled jacket and the observation hole, and can automatically blow dust intermittently according to the program.
[0055] Each independent jacket is equipped with a cooling water interface, with water entering from the bottom and flowing out from the top, and then aggregating to the main cooling water return pipe. Since the structures and temperatures of each part are different, a manual stop valve should be used to control the water volume of the branch circuit. Due to the requirement of controlling the water volume, a local rotor flowmeter and an outlet thermometer are set for each circuit. According to the calculation of the illustrated dimensions, the ratio of the heat dissipation surface of the side jacket to the surface jacket is approximately 1:3.75. Considering that the heat dissipation effect of the side structure is better, the water inlet ratio can be about 1:3.4 - 3.6. The size of the main cooling water pipe is DN40, which basically meets the maximum flow velocity of the main pipe and considers the possible maximum water temperature rise.
[0056] The lower water inlet should be set below the jacket so that the water can be fully mixed. Water inlet from the side can make full use of the area of the water-cooled jacket. The lower 1 / 3 - 1 / 2 position of the surface jacket is a low-temperature area, and theoretically, it can be directly touched by hand. The lower ash discharge device adopts a double pneumatic flap valve form for collection.
[0057] In summary, the boiler water-cooled ash discharge device and the boiler water-cooled ash discharge system proposed by the present utility model have strong equipment reliability, strong maintainability, are easy to use, and are easy to disassemble and assemble.
[0058] The surface of the present utility model is cooled by a water-cooled jacket, which is safe and easy to maintain; there is no moving device except the flap valve, and the mechanical components are not easily damaged; in addition, the device is equipped with a vibration and purging mechanism, which can effectively prevent the boiler ash discharge from being blocked.
[0059] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.
[0060] The description and application of the present utility model herein are illustrative and are not intended to limit the scope of the present utility model to the above embodiments. The effects or advantages involved in the embodiments may not be reflected in the embodiments due to interference of various factors, and the description of the effects or advantages is not used to limit the embodiments. Variations and changes of the disclosed embodiments are possible, and various components of substitution and equivalence of the embodiments are known to those of ordinary skill in the art. Those skilled in the art should be clear that without departing from the spirit or essential characteristics of the present utility model, the present utility model can be implemented in other forms, structures, arrangements, proportions, and with other components, materials, and parts. Other variations and changes can be made to the disclosed embodiments without departing from the scope and spirit of the present utility model.
Claims
1. A boiler water-cooled ash discharging device, characterized in that, The boiler water-cooled ash discharging device includes: a water-cooled ash receiving device, an ash discharging device and a cooling water conveying system; The water-cooled ash receiving device is provided with a hopper with an inverted trapezoidal cross-section; the hopper includes a plurality of water-cooled walls, and each water-cooled wall is internally provided with a water-cooling flow channel; the water-cooled wall is provided with at least one water inlet and at least one water outlet, and the water-cooling flow channels are respectively connected to each water inlet and each water outlet; The ash discharging device is connected to the water-cooled ash receiving device and is arranged below the water-cooled ash receiving device; the ash discharging device is provided with a flap valve; a part or all of the water-cooled walls of the hopper are inclined; the included angle between the inclined water-cooled wall and the horizontal plane is greater than the maximum stacking angle of the corresponding dry furnace ash; The cooling water conveying system includes a cooling water conveying pipeline, a plurality of first pipelines, a plurality of second pipelines and a return water pipeline; the cooling water conveying pipeline is respectively connected to the first ends of each first pipeline, and the second ends of each first pipeline are connected to the water inlets of the corresponding water-cooled walls; the water outlets of the water-cooled walls are connected to the first ends of the corresponding second pipelines, and the second ends of the second pipelines are connected to the return water pipeline; The cooling water conveying pipeline, each first pipeline, each second pipeline and the return water pipeline are respectively provided with a solenoid valve, a flow meter and a temperature sensing mechanism.
2. The boiler water-cooled ash discharging device according to claim 1, characterized in that: The hopper includes two first water-cooled walls longitudinally arranged in an inverted isosceles trapezoid and two second water-cooled walls inclinedly arranged in a rectangle; the two first water-cooled walls are arranged in parallel, and the inclination angle of the two second water-cooled walls is greater than or equal to 60°.
3. The boiler water-cooled ash discharging device according to claim 1, characterized in that: At least one first observation port and at least one ash cleaning port are respectively arranged at the bottom of the water-cooled ash receiving device; the ash discharging device is provided with at least one second observation port.
4. The boiler water-cooled ash discharging device according to claim 1, characterized in that: The flap valve is a double pneumatic flap valve; a vibration mechanism is arranged in the hopper.
5. The boiler water-cooled ash discharging device according to claim 1, characterized in that: The boiler water-cooled ash discharging device includes a plurality of water-cooled boiler ash discharging mechanisms arranged side by side; each water-cooled boiler ash discharging mechanism includes the above-mentioned water-cooled ash receiving device and ash discharging device.
6. The boiler water-cooled ash discharging device according to claim 1, characterized in that: At least one compressed air purging port is arranged on the water-cooled wall of the hopper, and each compressed air purging port is connected to a compressed air purging device, and the compressed air purging device can convey compressed air to each compressed air purging port and can purge the positions prone to ash accumulation.
7. The boiler water-cooled ash discharging device according to claim 1, characterized in that: The ash discharging device is provided with a cleaning interface, which can be connected to a cleaning mechanism, receive the cleaning medium conveyed by the cleaning mechanism, and clean the ash discharging device.
8. A boiler water-cooled ash discharging system, characterized in that: The boiler water-cooled ash discharging system includes a boiler water-cooled ash discharging device and a cooling water conveying system; The boiler water-cooled ash discharging device includes: a water-cooled ash receiving device and an ash discharging device; the water-cooled ash receiving device is provided with a hopper with an inverted trapezoidal cross-section; the hopper includes a plurality of water-cooled walls, and each water-cooled wall is internally provided with a water-cooling flow channel; The water wall is provided with at least one water inlet and at least one water outlet, and the water cooling flow channels are respectively connected to each water inlet and each water outlet; the ash discharging device is connected to the water cooling ash receiving device and is arranged below the water cooling ash receiving device; the ash discharging device is provided with a flap valve. The cooling water conveying system includes a cooling water conveying pipeline, a plurality of first pipelines, a plurality of second pipelines and a return water pipeline; the cooling water conveying pipeline is respectively connected to the first ends of the first pipelines, and the second ends of the first pipelines are connected to the water inlets of the corresponding water walls; the water outlets of the water walls are connected to the first ends of the corresponding second pipelines, and the second ends of the second pipelines are connected to the return water pipeline. The cooling water conveying pipeline, each first pipeline, each second pipeline and the return water pipeline are respectively provided with a solenoid valve, a flow meter and a temperature sensing mechanism.
9. The boiler water-cooled ash discharging system according to claim 8, wherein: The cooling water conveying system is a circulating cooling water system, and the circulating cooling water system circulates and conveys the cooling water; the circulating cooling water system is provided with a blowdown valve. The boiler water-cooled ash discharging system further includes a compressed air purging device and a cleaning mechanism. The compressed air purging device is connected to the compressed air purging ports arranged on the water wall, conveys compressed air to each compressed air purging port, and can purge the positions prone to ash accumulation. The cleaning mechanism is connected to the cleaning interface arranged on the ash discharging device, can convey a cleaning medium into the cleaning interface, and clean the ash discharging device.