Novel steel ball ash removal system
Through the physical impact and uniform bead distribution technology of the new steel bead cleaning system, the problem of heat transfer obstruction caused by ash accumulation in the boiler economizer is solved, and the effect of efficient ash cleaning, improving thermal efficiency and extending the equipment life is achieved.
Patent Information
- Application Number
- CN202421662960.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-07-15
AI Technical Summary
In existing boiler economizers, small particles in the flue gas are prone to bond to the heat exchange tube bundle, resulting in blockage of heat transfer, reducing thermal efficiency and output, increasing energy consumption, and may lead to clogging, corrosion and shortening of equipment life.
A new steel ball cleaning system is adopted, including a steel ball storage bin, a screw conveyor, a bead drop pipe, a buffer distribution bin and a bead tube. The dust accumulation on the heat exchange tube bundle is removed through physical impact and uniform bead distribution.
Effectively dissipate and remove strongly adhered ash, improve the heat transfer efficiency of the heat exchange tube bundle, extend the equipment life, reduce maintenance costs, and realize environmental protection and energy-saving recycling.
Smart Images
Figure CN222895140U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of boiler economizer ash cleaning, and in particular relates to a novel steel ball ash cleaning system. Background Art
[0002] The boiler economizer uses heat exchange to preheat water from the high-temperature flue gas discharged from the boiler to achieve the effect of saving coal. The boiler economizer includes an economizer shell, a heat exchange tube bundle arranged in the economizer shell, and a water inlet and outlet of the heat exchange tube bundle extending to the outside of the economizer shell. In existing boilers that use coal or garbage as heat sources, due to incomplete combustion of the fuel and other reasons, the flue gas is often accompanied by small particles formed by combustion residues. These small particles are easily adhered to the heat exchange tube bundle of the boiler economizer or the heating surface on the heat exchange tube bundle, seriously affecting the heat transfer inside and outside the heat exchange tube bundle, resulting in reduced thermal efficiency and output of the boiler, and increased energy consumption due to heat energy loss with flue gas discharge; at the same time, ash accumulation and scaling reduce the tube gap channel of the heat exchange tube bundle, resulting in increased thermal resistance of the heat exchange tube bundle and flue of the boiler economizer, and even block the economizer shell in severe cases, resulting in forced shutdown of the boiler; in addition, ash accumulation and scaling will corrode the heat exchange tube bundle, resulting in tube burst and working fluid leakage, shortening the maintenance cycle and equipment life. Utility Model Content
[0003] The utility model aims to provide a novel steel ball dust cleaning system in view of the above problems existing in the prior art.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A new type of steel ball cleaning system includes a steel ball storage bin and a first screw conveyor. The discharge port of the first screw conveyor is located above the ball inlet at the top of the steel ball storage bin, and the ball outlet at the bottom of the steel ball storage bin is connected to the top of an economizer shell through a ball dropping pipe, and an injection control valve is provided on the ball dropping pipe. The bottom of the economizer shell is connected to the feed port of a second screw conveyor through a recovery pipe, and a first recovery control valve is provided on the recovery pipe. The discharge port of the second screw conveyor is connected to one end of a conveying pipe, and the other end of the conveying pipe is located above the feed port of a bucket elevator. The discharge port of the bucket elevator is located above the feed port of the first screw conveyor.
[0006] As mentioned above, a steel ball stirring blade is arranged in the steel ball storage bin, and the steel ball stirring blade is connected to the stirring motor through a rotating rod.
[0007] As mentioned above, a buffer distribution bin is arranged on the top of the economizer shell, the bottom end of the bead dropping pipe is connected to the buffer distribution bin, a plurality of bead outlet holes are arranged on the bottom of the buffer distribution bin, each bead outlet hole is connected to the top end of a corresponding bead distribution tube, and the bottom end of the bead distribution tube extends to above the heat exchange tube bundle in the economizer shell.
[0008] As mentioned above, there are multiple bead dropping pipes and buffer distribution bins, and they correspond one to one.
[0009] As mentioned above, the portion where the steel ball storage bin is connected to the ball dropping pipeline is funnel-shaped.
[0010] As mentioned above, the steel ball storage bin is also provided with a material level meter and a temperature sensor.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] 1. The utility model physically impacts the heat exchange tube bundle of the boiler economizer by cleaning steel balls, so as to disperse the ash strongly attached to the heat exchange tube bundle, and effectively treat the ash that cannot be treated by conventional ventilation and soot blowing.
[0013] 2. The utility model can effectively and evenly deliver the cleaning steel beads to the top of the heat exchange tube bundle of the boiler economizer through the bead distribution tube, so as to clean the dust evenly.
[0014] 3. Cleaning steel balls can be recycled, which meets the requirements of modern industry for environmental protection and energy saving.
[0015] 4. The system has a simple structure, high stability, good reliability, can operate stably for a long time, is easy to maintain and manage, and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] In the figure: 1. Steel ball storage bin; 1-1. Steel ball stirring blade; 1-2. Stirring motor; 1-3. Material level meter; 1-4. Temperature sensor; 1-5. Injection control valve; 1-6. Bead dropping pipe; 2. Boiler economizer; 2-1. Economizer shell; 2-2. Heat exchange tube bundle; 2-3. Buffer distribution bin; 2-4. Bead distribution pipe; 3. Second screw conveyor; 3-1. First recovery control valve; 3-2. Second screw conveyor motor; 3-3. Second recovery control valve; 3-4. Recovery pipe; 3-5. Conveying pipe; 4. Bucket elevator; 4-1. Bucket elevator motor; 5. First screw conveyor; 5-1. First screw conveyor motor; 6. Control cabinet. DETAILED DESCRIPTION
[0018] In order to facilitate ordinary technicians in this field to understand and implement the present invention, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the implementation examples described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0019] Embodiment 1:
[0020] A novel steel ball cleaning system comprises a steel ball storage bin 1, in which cleaning steel balls are arranged, and a first screw conveyor 5, wherein the discharge port of the first screw conveyor 5 is located above the ball inlet port at the top of the steel ball storage bin 1, and the first screw conveyor 5 is used to spirally propel the cleaning steel balls lifted and output by the bucket elevator 4, and output them from the discharge port to the steel ball storage bin 1, preferably, the discharge port of the first screw conveyor 5 can be connected to the ball inlet port at the top of the steel ball storage bin 1 through a pipeline, and the ball outlet port at the bottom of the steel ball storage bin 1 is connected to the top of the economizer shell 2-1 through a ball drop pipeline 1-6, and an injection control valve 1-5 is arranged on the ball drop pipeline 1-6, and the injection control valve 1-5 is used to control the steel balls Whether the cleaning steel balls in the storage bin 1 fall into the economizer shell 2-1, the bottom of the economizer shell 2-1 is connected to the feed port of the second screw conveyor 3 through the recovery pipe 3-4, and the first recovery control valve 3-1 is arranged on the recovery pipe 3-4, the discharge port of the second screw conveyor 3 is connected to one end of the conveying pipe 3-5, and the other end of the conveying pipe 3-5 is located above the feed port of the bucket elevator 4. Under the action of gravity, the cleaning steel balls output from the discharge port of the second screw conveyor 3 enter the feed port of the bucket elevator 4 through the conveying pipe 3-5, and the discharge port of the bucket elevator 4 is located above the feed port of the first screw conveyor 5. The bucket elevator 4 lifts the input cleaning steel balls and inputs them into the feed port of the first screw conveyor 5.
[0021] When the heat exchange tube bundle 2-2 in the economizer shell 2-1 needs to be dusted, the smoke inlet and smoke outlet on the economizer shell 2-1 are closed, the injection control valve 1-5, the first recovery control valve 3-1, and the second recovery control valve 3-3 are opened, and the cleaning steel balls output by the first screw conveyor 5 fall into the steel ball storage bin 1, and are further transported to the top of the economizer shell 2-1 and fall freely. The freely falling cleaning steel balls fall on the heat exchange tube bundle 2-2, and the vibration generated will loosen the accumulated dust and make the accumulated dust separate from the heat exchange tube bundle 2-2. The ash deposited on 2-2 generally has strong adhesion, so conventional ventilation soot blowing cannot remove the ash deposited on the heat exchange tube bundle 2-2. Physical vibration is required to remove it. In addition, since the heat exchange tube bundle 2-2 is usually distributed in an array in the economizer shell 2-1, the cleaning steel balls will be ejected between the heat exchange tube bundles 2-2 at different heights during the movement from top to bottom, effectively vibrating the ash deposited on the heat exchange tube bundle 2-2. The fallen ash will be discharged to the external flue gas treatment system with the flue gas after the smoke inlet and smoke outlet are opened. The cleaning steel balls coming out from the bottom of the economizer shell 2-1 fall into the feed port of the second screw conveyor 3, and are transmitted to the bucket elevator 4 through the second screw conveyor 3, and are lifted by the bucket elevator 4 and further output to the first screw conveyor 5, thereby forming a cyclic cleaning.
[0022] As a preferred solution, a steel ball stirring blade 1-1 is provided in the steel ball storage bin 1, and the steel ball stirring blade 1-1 is connected to the stirring motor 1-2 through a rotating rod. When the cleaning steel balls are blocked in the steel ball storage bin 1, resulting in the blockage of the bead outlet of the steel ball storage bin 1 and the beads cannot be discharged, the stirring motor 1-2 can drive the stirring blade 1-1 to rotate, generate disturbance, break the blocking state in the steel ball storage bin 1, and the bead outlet of the steel ball storage bin 1 can smoothly discharge the beads.
[0023] As a preferred solution, in order to make the cleaning steel balls fall evenly into the economizer shell 2-1, a buffer distribution bin 2-3 is provided on the top of the economizer shell 2-1, and the bottom end of the bead dropping pipe 1-6 is connected to the buffer distribution bin 2-3. A plurality of bead outlet holes are provided at the bottom of the buffer distribution bin 2-3, and each bead outlet hole is connected to the top end of a corresponding bead distribution tube 2-4. There are multiple bead dropping pipes 1-6 and buffer distribution bins 2-3 and they correspond one to one. The bottom end of the bead distribution tube 2-4 extends to above the heat exchange tube bundle 2-2 in the economizer shell 2-1. The cleaning steel balls fall into the buffer distribution bin 2-3 through the bead dropping pipe 1-6, and fall into the corresponding bead distribution tube 2-4 through the bead outlet holes evenly distributed at the bottom of the buffer distribution bin 2-3. The bottom ends of the bead distribution tubes 2-4 are evenly distributed above the heat exchange tube bundle 2-2 in the economizer shell 2-1.
[0024] As a preferred solution, the portion where the steel ball storage bin 1 is connected to the bead dropping pipe 1-6 is funnel-shaped, and the bottom of the funnel-shaped steel ball storage bin 1 is conducive to the cleaning steel balls being gathered at the opening at the bottom of the funnel for discharge.
[0025] As a preferred solution, a material level meter 1-3 and a temperature sensor 1-4 are also provided on the steel ball storage bin 1. The material level meter 1-3 is used to monitor the height of the cleaning steel balls in the steel ball storage bin 1. When the height of the cleaning steel balls in the steel ball storage bin 1 is detected to be greater than the set height value, the first screw conveyor 5 and the second screw conveyor 3 need to be stopped to avoid blocking the steel ball storage bin 1. The temperature sensor 1-4 is used to monitor the temperature in the steel ball storage bin 1.
[0026] The first screw conveyor 5, the second screw conveyor 3 and the bucket elevator 4 are driven by a first screw conveyor motor 5-1, a second screw conveyor motor 3-2 and a bucket elevator motor 4-1 respectively.
[0027] As a preferred solution, the material level meter 1-3, the temperature sensor 1-4, the stirring motor 1-2, the bucket elevator motor 4-1, the first screw conveying motor 5-1, the injection control valve 1-5, the second screw conveying motor 3-2, and the second recovery control valve 3-3 are all connected to the control cabinet. The acquisition unit in the control cabinet collects the signals of the material level meter 1-3 and the temperature sensor 1-4; the valve control unit in the control cabinet controls the valve switch of the injection control valve 1-5 and the second recovery control valve 3-3; the motor control unit in the control cabinet is used to control the stirring motor 1-2, the bucket elevator motor 4-1, the first screw conveying motor 5-1, and the second screw conveying motor 3-2.
[0028] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A new type of steel ball cleaning system, characterized in that: The invention comprises a steel ball storage bin (1) and a first screw conveyor (5), wherein the discharge port of the first screw conveyor (5) is located above the bead inlet at the top of the steel ball storage bin (1), the bead discharge port at the bottom of the steel ball storage bin (1) is connected to the top of an economizer shell (2-1) through a bead dropping pipe (1-6), an injection control valve (1-5) is arranged on the bead dropping pipe (1-6), the bottom of the economizer shell (2-1) is connected to the feed port of a second screw conveyor (3) through a recovery pipe (3-4), a first recovery control valve (3-1) is arranged on the recovery pipe (3-4), the discharge port of the second screw conveyor (3) is connected to one end of a conveying pipe (3-5), the other end of the conveying pipe (3-5) is located above the feed port of a bucket elevator (4), and the discharge port of the bucket elevator (4) is located above the feed port of the first screw conveyor (5).
2. According to claim 1, a new steel ball cleaning system is characterized in that: A steel ball stirring blade (1-1) is arranged in the steel ball storage bin (1), and the steel ball stirring blade (1-1) is connected to a stirring motor (1-2) via a rotating rod.
3. According to claim 1, a new steel ball cleaning system is characterized in that: A buffer distribution bin (2-3) is arranged on the top of the economizer shell (2-1), the bottom end of the bead dropping pipe (1-6) is connected to the buffer distribution bin (2-3), a plurality of bead outlet holes are arranged on the bottom of the buffer distribution bin (2-3), each bead outlet hole is connected to the top end of a corresponding bead distribution tube (2-4), and the bottom end of the bead distribution tube (2-4) extends to the top of the heat exchange tube bundle (2-2) in the economizer shell (2-1).
4. According to claim 3, a new steel ball cleaning system is characterized in that: The bead dropping pipelines (1-6) and the buffer distribution bins (2-3) are both multiple and correspond one to one.
5. According to the novel steel ball cleaning system of claim 1, it is characterized in that: The portion where the steel ball storage bin (1) is connected to the ball dropping pipeline (1-6) is funnel-shaped.
6. According to the novel steel ball cleaning system of claim 1, it is characterized in that: The steel ball storage bin (1) is also provided with a material level meter (1-3) and a temperature sensor (1-4).