Sludge continuous feeding device and method for coal-fired coupled sludge co-combustion system

Abstract

The present invention discloses a sludge continuous feeding device and method for a coal-fired coupled sludge co-combustion system. The device includes a sludge storage bin, a sludge conveying pipe, and a coal feeder. The sludge storage bin is connected to one end of the sludge conveying pipe, and the other end of the sludge conveying pipe is connected to the coal feeder. The feeder is provided in the sludge conveying pipe, and the amount of sludge in the sludge conveying pipe entering the coal feeder is regulated by the feeder. The present invention can achieve a relatively accurate and stable feeding amount by controlling the rotational speed of the screw agitator and the feeder, as well as the magnetic state between the fixed blade and the limiting blade of the feeder. At the same time, the load of a single feed is reduced, the risk of sludge blockage and equipment jamming is reduced, and the stability and reliability of the feed are improved. In addition, by providing a limiting blade and a magnetic attraction and repulsion combination, the function of online cleaning of the feeder is realized. The present invention has the dual functions of continuous sludge feeding and online cleaning, and the equipment is easy to operate, reduces maintenance workload, and improves work efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a sludge continuous feeding device and method for a coal-fired coupled sludge blending combustion system. Background Art

[0002] With the continuous improvement of urbanization in my country, the scale of urban sewage treatment is rapidly expanding, and with it, the production of urban sludge is increasing. Achieving the harmlessness, reduction, and resource utilization of sludge has become a new challenge. Utilizing existing coal-fired power plants to co-combust sludge and achieve coupled power generation not only leverages the clean and efficient pollutant treatment capabilities of coal-fired units, but also reduces total carbon dioxide emissions and generates some benefits. This is in line with the current trend of vigorously developing a circular economy and reducing carbon emissions, and has positive social and economic benefits.

[0003] The sludge drying and co-combustion technology route can achieve large sludge disposal volumes while ensuring combustion thermal stability, and has therefore been widely used in coal-fired power plants. The dried sludge enters the coal feeder through the co-combustion system, which primarily includes a sludge conveyor belt, a sludge storage silo, and a feeder. Currently, the technology for sludge conveyor belts and sludge storage silos is relatively mature, but the performance of the co-combustion system is primarily limited by the feeder and feeding continuity, making it prone to feed jams and interruptions, resulting in downtime for maintenance and sludge accumulation. Therefore, there is an urgent need to develop a reliable and easy-to-operate sludge continuous feeding device for the coal-fired coupled sludge co-combustion system to improve the stability and continuity of sludge feeding.

[0004] Chinese patents, including publication numbers CN 109838789A and CN 211854037U, disclose systems for coupled dry sludge incineration but do not provide detailed descriptions of the feeding system. Chinese patent publication number CN 215951441A discloses a sludge incineration coal feeding device that prevents blockage after dry sludge and raw coal are mixed into the coal bunker. However, it is not suitable for direct mixing of dry sludge into the coal feeder. Currently, there is no reliable technical solution to the problem of continuous feeding of sludge directly into the coal feeder. Summary of the Invention

[0005] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a sludge continuous feeding device and method for a coal-fired coupled sludge co-combustion system.

[0006] In order to achieve the above-mentioned purpose and the above-mentioned technical effect, the technical solution adopted by the present invention is:

[0007] A sludge continuous feeding device used in a coal-fired coupled sludge co-firing system comprises a sludge storage bin, a sludge conveying pipe and a coal feeder. The sludge storage bin is connected to one end of the sludge conveying pipe, and the other end of the sludge conveying pipe is connected to the coal feeder. The feeder is arranged in the sludge conveying pipe, and the amount of sludge in the sludge conveying pipe entering the coal feeder is regulated by the feeder.

[0008] Furthermore, a closing end is provided at the connection point between the sludge storage bin and the sludge conveying pipe, and a hydraulic gate is provided on the sludge conveying pipe near the closing end, and the connection between the sludge storage bin and the sludge conveying pipe is achieved by controlling the opening and closing of the hydraulic gate.

[0009] Furthermore, the angle between the outer surface of the closing and the center line is less than 45°.

[0010] Furthermore, a screw agitator is provided in the sludge storage bin, and the sludge in the sludge storage bin is mixed evenly by the screw agitator and then transported to the sludge transport pipe.

[0011] Furthermore, the sludge storage bin is a tall and thin structure with a height-to-diameter ratio greater than 2.

[0012] Furthermore, the feeder includes a main shaft, a feeder fixed blade, a limiting blade 1 and a limiting blade 2 arranged along the central axis. The main shaft has a plurality of feeder fixed blades uniformly distributed in a divergent shape with the central axis as the center. Each feeder fixed blade is provided with a corresponding limiting blade 1 and limiting blade 2. The limiting blade 1 is located between the feeder fixed blade and the limiting blade 2. The limiting blade 1 and the limiting blade 2 can both move toward or back toward the feeder fixed blade around the connection point with the feeder fixed blade.

[0013] Furthermore, each of the fixed blades of the feeder is provided with an electromagnetic induction component, each limiting blade 1 is provided with an electromagnetic induction component 1, and each limiting blade 2 is provided with an electromagnetic induction component 2. The sludge feeding amount is controlled by controlling the magnetic state between the fixed blade of the feeder and the limiting blade 1 and the limiting blade 2 thereon.

[0014] Furthermore, when the limit blade 1 and the limit blade 2 are not working, the electromagnetic induction component, the electromagnetic induction component 1 and the electromagnetic induction component 2 are set to a magnetic attraction state. At this time, the fixed blade of the feeder and the limit blade 1 and the limit blade 2 thereon are stacked, and the opposite sides of the limit blade 1 contact the fixed blade and the limit blade 2 of the feeder respectively, and the feeder provides the maximum sludge feeding amount; when the electromagnetic induction component and the electromagnetic induction component 1 are magnetically repelled, and the electromagnetic induction component 1 and the electromagnetic induction component 2 are magnetically attracted, at this time, the fixed blade of the feeder and the limit blade 1 thereon cannot contact each other due to the magnetic repulsion, and the limit blade 1 and the limit blade 2 on the fixed blade of the feeder are stacked and connected due to the magnetic attraction, and the feeder provides a smaller sludge feeding amount; when the electromagnetic induction component and the electromagnetic induction component 1 are magnetically repelled, and the electromagnetic induction component 1 and the electromagnetic induction component 2 are magnetically repelled, at this time, the fixed blade of the feeder and the limit blade 1 and the limit blade 2 thereon repel each other and cannot contact each other, and the feeder provides the minimum sludge feeding amount.

[0015] The method for continuous sludge feeding in a coal-fired coupled sludge co-combustion system is implemented using the above-mentioned continuous sludge feeding device for the coal-fired coupled sludge co-combustion system, and the method comprises the following steps:

[0016] ① Before work, close the hydraulic gate, open the sludge storage bin, start loading the sludge, start the screw agitator, mix the sludge evenly to avoid sedimentation and agglomeration;

[0017] ② When the sludge storage bin is full, stop feeding, open the hydraulic gate, turn on the feeder, and control the following three parts according to the sludge blending amount to achieve precise sludge blending: control the speed of the screw agitator, control the speed of the feeder, and set the fixed blade of the feeder and the limit blades 1 and 2 on it to a magnetic attraction or magnetic repulsion state to control the sludge feeding amount;

[0018] ③ After feeding is completed, close the hydraulic gate, turn off the screw agitator, set the fixed blade of the feeder and the limit blades 1 and 2 on it to a magnetic repulsion state, clean the sludge remaining on the fixed blade of the feeder, and then turn off the feeder.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention discloses a sludge continuous feeding device and method for a coal-fired coupled sludge co-combustion system. The device includes a sludge storage bin, a sludge conveying pipe, and a coal feeder. The sludge storage bin is connected to one end of the sludge conveying pipe, and the other end of the sludge conveying pipe is connected to the coal feeder. The feeder is provided in the sludge conveying pipe, and the amount of sludge in the sludge conveying pipe entering the coal feeder is regulated by the feeder. The present invention can achieve a relatively accurate and stable feeding amount by controlling the rotational speed of the screw agitator and the feeder, as well as the magnetic state between the fixed blade and the limiting blade of the feeder. At the same time, the load of a single feed is reduced, the risk of sludge blockage and equipment jamming is reduced, and the stability and reliability of the feed are improved. In addition, by providing a limiting blade and a magnetic attraction and repulsion combination, the function of online cleaning of the feeder is realized. The present invention has the dual functions of continuous sludge feeding and online cleaning, and the equipment is easy to operate, reduces maintenance workload, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 Schematic diagram of the structure of the screw agitator of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the feeder of the present invention;

[0024] Figure 4 This is a schematic diagram of the feeder of the present invention when the fixed blades correspond to the feeding amount;

[0025] Figure 5 This is a schematic diagram of the feeder of the present invention when the blade is limited to one corresponding to the feeding amount;

[0026] Figure 6 This is a schematic diagram of the feeder of the present invention when the blade 2 is limited to the feeding amount corresponding to the feeding amount;

[0027] Among them, 1. Sludge storage bin; 11. Closing; 2. Sludge conveying pipe; 21. Screw mixer; 22. Hydraulic gate; 23. Feeder; 230. Main shaft; 231. Feeder fixed blade; 232. Limit blade 1; 233. Limit blade 2; 241. Fixed blade corresponding to feeding amount; 242. Limit blade 1 corresponding to feeding amount; 243. Limit blade 2 corresponding to feeding amount; 3. Coal feeder. DETAILED DESCRIPTION

[0028] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0029] The following is a brief summary of one or more aspects to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceivable aspects and is neither intended to identify key or critical elements of all aspects nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that will be provided later.

[0030] like Figure 1-6 As shown, a sludge continuous feeding device for a coal-fired coupled sludge co-firing system comprises a sludge storage bin 1, a sludge conveying pipe 2 and a coal feeder 3. A screw agitator 21 is provided in the sludge storage bin 1. The screw agitator 21 comprises a screw 211 and spiral blades 212 spirally arranged thereon. A feeder 23 is provided in the sludge conveying pipe 2. The sludge storage bin 1 is connected to the sludge conveying pipe 2, which is connected to the coal feeder 3. The sludge in the sludge storage bin 1 is mixed evenly by the screw agitator 21 and then conveyed to the sludge conveying pipe 2. The amount of sludge in the sludge conveying pipe 2 entering the coal feeder 3 is regulated by the feeder 23.

[0031] The sludge storage bin 1 is a tall and thin structure with a height-to-diameter ratio (height / outer diameter) greater than 2. A closure 11 is provided at the connection between the sludge storage bin 1 and the sludge conveying pipe 2. The angle between the outer surface of the closure 11 and the center line is less than 45°. A hydraulic gate 22 is provided on the sludge conveying pipe 2 near the closure 11. When external sludge enters the sludge storage bin 1 and the hydraulic gate 22 is not opened, the screw agitator 21 can stir the sludge when it is started. After the hydraulic gate 22 is opened, the speed of the screw agitator 21 can be controlled when it is started, which can play a role in semi-quantitative sludge conveying. At the same time, it avoids the sludge quickly entering the sludge conveying pipe 2, causing the feeder 23 to overload and affect the work.

[0032] The feeder 23 includes a main shaft 230 arranged along the central axis, several feeder fixed blades 231, several limiting blades 1 232 and several limiting blades 2 233. The main shaft 230 has several feeder fixed blades 231 that are evenly distributed in a divergent shape with the central axis as the center. Each feeder fixed blade 231 (away from the end of the main shaft 230) is provided with two matching limiting blades, which are respectively recorded as limiting blade 1 232 and limiting blade 2 233. The limiting blade 1 232 is located between the feeder fixed blade 231 and the limiting blade 2 233, and the structures, sizes and positions of the three are all matched. The limiting blade 1 232 and the limiting blade 2 233 can both move toward or away from the feeder fixed blade 231 around the connection point with the feeder fixed blade 231. The feeding frequency is controlled by controlling the rotation speed of the main shaft 230, and then the amount of sludge entering the coal feeder 3 is controlled.

[0033] As a specific embodiment, each feeder fixed blade 231 is provided with an electromagnetic induction component 234, each limiting blade 1 232 is provided with an electromagnetic induction component 1 235, and each limiting blade 2 233 is provided with an electromagnetic induction component 2 236. When the limiting blades (i.e., limiting blade 1 232 and limiting blade 2 233) are not working, the electromagnetic induction component 1 235 and the electromagnetic induction component 2 236 are set to a magnetic attraction state, that is, the electromagnetic induction component 234 and the electromagnetic induction component 1 235 are magnetically attracted to each other, and the electromagnetic induction component 1 235 and the electromagnetic induction component 2 236 are magnetically attracted to each other. At this time, the feeder fixed blade 231 and the limiting blade 1 232 and the limiting blade 2 233 thereon are stacked, and the opposite sides of the limiting blade 1 232 are in contact with the feeder fixed blade 231 and the limiting blade 2 233 respectively. At this time, the feeder 23 provides the maximum sludge feeding amount, i.e. Figure 4 The fixed plate shown corresponds to the feeding amount 241; when the electromagnetic induction member 234 and the electromagnetic induction member 1 235 are magnetically repelled, and the electromagnetic induction member 1 235 and the electromagnetic induction member 2 236 are magnetically attracted, at this time, the limiting blade 1 232 and the limiting blade 2 233 on the fixed blade 231 of the feeder are stacked and connected due to magnetic attraction, and the fixed blade 231 of the feeder and the limiting blade 1 232 thereon cannot contact each other due to magnetic repulsion, forming a cavity. At this time, the feeder 23 provides a feeding amount that is reduced compared to the feeding amount 241 corresponding to the fixed plate. The sludge is mainly discharged through Figure 5 The limiting blade 1 shown corresponds to the feeding amount 242 entering the coal feeder 3; when the electromagnetic induction member 234 and the electromagnetic induction member 1 235 are magnetically repelled, and the electromagnetic induction member 1 235 and the electromagnetic induction member 2 236 are magnetically repelled, at this time, the fixed blade 231 of the feeder and the limiting blade 1 232 and the limiting blade 2 233 thereon repel each other and cannot contact each other, and a cavity is formed between the fixed blade 231 of the feeder and the limiting blade 1 232 thereon, and another cavity is formed between the limiting blade 1 232 and the limiting blade 2 233. At this time, the feeder 23 provides the minimum sludge feeding amount, and the sludge is mainly fed through Figure 6 The feed amount 243 corresponding to the limiting blade 2 shown enters the coal feeder 3. When the work is completed, by setting the feeder fixed blade 231 and the limiting blade 1 232 and limiting blade 2 233 above it in a repulsive state, some sludge deposited on the adjacent fixed plate feeder fixed blade 231 can also be cleaned, avoiding shutdown for cleaning, and improving the stability and reliability of the system.

[0034] A sludge continuous feeding method for a sludge continuous feeding device in a coal-fired coupled sludge co-combustion system comprises the following steps:

[0035] ① Before work, close the hydraulic gate 22, open the sludge storage bin 1, start loading the sludge, start the screw agitator 21, mix the sludge evenly to avoid sedimentation and agglomeration;

[0036] ② After the sludge storage bin 1 is full, the feeding is stopped, the hydraulic gate 22 is opened, the feeder 23 is turned on, and the following three parts are controlled according to the sludge blending amount to achieve precise sludge blending: controlling the speed of the screw agitator 21, controlling the speed of the feeder 23, and setting the magnetic attraction or magnetic repulsion between the fixed blade 231 of the feeder and the limiting blade 1 232 and the limiting blade 2 233 thereon to control the sludge feeding amount;

[0037] ③ After the feeding is completed, the hydraulic gate 22 is closed, the screw agitator 21 is turned off, and the fixed blade 231 of the feeder and the limiting blade 1 232 and the limiting blade 2 233 thereon are set to a magnetic repulsion state, the sludge remaining on the fixed blade 231 of the feeder is cleaned, and then the feeder 23 is turned off;

[0038] At this point, a continuous sludge feeding process has been completed through the above steps. By controlling the rotational speed of the screw agitator 21 and the feeder 23, as well as the magnetic state between the fixed blade 231 and the limiting blade of the feeder, a more accurate and stable feeding amount can be achieved. At the same time, the load of a single feed is reduced, the risk of sludge blockage and equipment jamming is reduced, and the feeding stability is improved. In addition, by setting a limiting blade and a magnetic repulsion combination, the function of online cleaning of the feeder 23 is realized, further improving the stability and reliability of the feeding. If the amount of sludge is sufficient, steps ① and ② can also be performed simultaneously to ensure that the sludge enters and exits the warehouse synchronously, which can further improve the feeding efficiency.

[0039] The present invention realizes continuous feeding and online cleaning of sludge, and the equipment is easy to operate, the feeding is stable, and the cleaning after feeding is completed is convenient, which effectively improves the stability and reliability of feeding, reduces the maintenance workload, and improves work efficiency.

[0040] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0041] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sludge continuous feeding device for a coal-fired coupled sludge co-combustion system, characterized in that: It includes a sludge storage bin, a sludge conveying pipe and a coal feeder. The sludge storage bin is connected to one end of the sludge conveying pipe, and the other end of the sludge conveying pipe is connected to the coal feeder. A feeder is provided in the sludge conveying pipe. The amount of sludge in the sludge conveying pipe entering the coal feeder is regulated by the feeder. The feeder includes a main shaft, a feeder fixed blade, a limiting blade 1 and a limiting blade 2 arranged along the central axis. The main shaft has a plurality of feeder fixed blades uniformly distributed in a divergent shape with the central axis as the center. Each feeder fixed blade is provided with a corresponding limiting blade 1 and limiting blade 2. The limiting blade 1 is located between the feeder fixed blade and the limiting blade 2. The limiting blade 1 and the limiting blade 2 can both move toward or back toward the feeder fixed blade around the connection point with the feeder fixed blade.

2. The sludge continuous feeding device for the coal-fired coupled sludge co-combustion system according to claim 1 is characterized in that: The sludge storage bin and the sludge conveying pipe are connected at a closing point, and a hydraulic gate is provided on the sludge conveying pipe near the closing point. The connection between the sludge storage bin and the sludge conveying pipe is achieved by controlling the opening and closing of the hydraulic gate.

3. The sludge continuous feeding device for the coal-fired coupled sludge co-combustion system according to claim 2 is characterized in that: The angle between the outer surface of the closing and the center line is less than 45°.

4. The sludge continuous feeding device for the coal-fired coupled sludge co-combustion system according to claim 1 is characterized in that: A screw stirrer is provided in the sludge storage bin, and the sludge in the sludge storage bin is mixed uniformly by the screw stirrer and then transported to the sludge transport pipe.

5. The sludge continuous feeding device for the coal-fired coupled sludge co-combustion system according to claim 1 is characterized in that: The sludge storage bin is a tall and thin structure with a height-to-diameter ratio greater than 2.

6. The sludge continuous feeding device for the coal-fired coupled sludge co-combustion system according to claim 1 is characterized in that: Each of the fixed blades of the feeder is provided with an electromagnetic induction component, each limiting blade 1 is provided with an electromagnetic induction component 1, and each limiting blade 2 is provided with an electromagnetic induction component 2. The sludge feeding amount is controlled by controlling the magnetic state between the fixed blade of the feeder and the limiting blade 1 and the limiting blade 2 thereon.

7. The sludge continuous feeding device for the coal-fired coupled sludge co-combustion system according to claim 6 is characterized in that: When the limit blade 1 and the limit blade 2 are not working, the electromagnetic induction component, the electromagnetic induction component 1 and the electromagnetic induction component 2 are set to a magnetic attraction state. At this time, the fixed blade of the feeder and the limit blade 1 and the limit blade 2 thereon are stacked, and the opposite sides of the limit blade 1 contact the fixed blade and the limit blade 2 of the feeder respectively, and the feeder provides the maximum sludge feeding amount; when the electromagnetic induction component and the electromagnetic induction component 1 are magnetically repelled, and the electromagnetic induction component 1 and the electromagnetic induction component 2 are magnetically attracted, at this time, the fixed blade of the feeder and the limit blade 1 thereon cannot contact each other due to the magnetic repulsion, and the limit blade 1 and the limit blade 2 on the fixed blade of the feeder are stacked and connected due to the magnetic attraction, and the feeder provides a smaller sludge feeding amount; when the electromagnetic induction component and the electromagnetic induction component 1 are magnetically repelled, and the electromagnetic induction component 1 and the electromagnetic induction component 2 are magnetically repelled, at this time, the fixed blade of the feeder and the limit blade 1 and the limit blade 2 thereon repel each other and cannot contact each other, and the feeder provides the minimum sludge feeding amount.

8. A method for continuous sludge feeding in a coal-fired coupled sludge co-combustion system, characterized in that: The method is implemented by using the sludge continuous feeding device for a coal-fired coupled sludge co-combustion system according to any one of claims 1 to 7, and the method comprises the following steps: ① Before work, close the hydraulic gate, open the sludge storage bin, start loading the sludge, start the screw agitator, mix the sludge evenly to avoid sedimentation and agglomeration; ② When the sludge storage bin is full, stop feeding, open the hydraulic gate, turn on the feeder, and control the following three parts according to the sludge blending amount to achieve precise sludge blending: control the speed of the screw agitator, control the speed of the feeder, and set the fixed blade of the feeder and the limit blades 1 and 2 on it to a magnetic attraction or magnetic repulsion state to control the sludge feeding amount; ③ After feeding is completed, close the hydraulic gate, turn off the screw agitator, set the fixed blade of the feeder and the limit blades 1 and 2 on it to a magnetic repulsion state, clean the sludge remaining on the fixed blade of the feeder, and then turn off the feeder.

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