Solid waste recovery device and recovery method for synergistic coal gasification of circulating fluidized bed boiler

Abstract

The invention discloses a circulating fluidized bed boiler synergistic coal gasification solid waste recovery device which comprises a slag conveyor, an outlet of the slag conveyor is connected with a dewatering screen, an outlet of the dewatering screen is provided with a coarse slag conveying mechanism and a primary stirring mechanism, and the coarse slag conveying mechanism is connected with a coarse slag storage yard and a coarse slag silo through a separation unit. The primary stirring mechanism is connected with a coarse slag silo, a raw material coal conveying belt is arranged below the coarse slag silo, the primary stirring mechanism is connected with a secondary stirring mechanism, a fine slag conveying belt is arranged at the outlet end of the secondary stirring mechanism, a fine slag silo is arranged at the end part of the fine slag conveying belt, and the fine slag silo is arranged above the raw material coal conveying belt. The invention further discloses a recycling method of the circulating fluidized bed boiler and coal gasification cooperated solid waste recycling device. Through cooperative operation of the circulating fluidized bed boiler and the coal gasification device, resource utilization of coal gasification coarse slag and fine slag is achieved, and compared with an existing landfill treatment mode, the solid waste treatment cost is reduced, and the environmental protection pressure is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of solid waste resource utilization and energy recovery devices, specifically relating to a solid waste recovery device for circulating fluidized bed boiler co-gasification, and also to a recovery method of the solid waste recovery device. Background Technology

[0002] Currently, domestic coal gasification plants generate a large amount of coarse and fine slag during production, which are classified as general industrial solid waste. This type of waste slag has low carbon content, low calorific value, and high water content. Traditional treatment methods often involve landfill disposal, which not only increases the solid waste disposal costs for enterprises but also easily causes secondary pollution during transportation and storage, placing significant environmental pressure on enterprises.

[0003] Therefore, there is an urgent need to develop an efficient and environmentally friendly solid waste treatment technology to alleviate the current solid waste disposal problem. Summary of the Invention

[0004] The purpose of this invention is to provide a solid waste recovery device for circulating fluidized bed boilers and coal gasification, which solves the problem of secondary pollution caused by landfilling general industrial solid waste in the prior art.

[0005] Another object of the present invention is to provide a method for recycling solid waste from a circulating fluidized bed boiler co-gasification solid waste recycling device.

[0006] The technical solution adopted in this invention is: a solid waste recovery device for circulating fluidized bed boiler co-gasification, including a slag remover. The outlet of the slag remover is connected to a dewatering screen. The outlet of the dewatering screen is respectively equipped with a coarse slag conveying mechanism and a primary stirring mechanism. The coarse slag conveying mechanism is connected to a coarse slag stockpile and a coarse slag silo through a separation unit. A raw coal conveying belt is provided below the coarse slag silo. The primary stirring mechanism is connected to a secondary stirring mechanism. A fine slag conveying belt is provided at the outlet end of the secondary stirring mechanism. A fine slag silo is provided at the end of the fine slag conveying belt and is located above the raw coal conveying belt.

[0007] The invention is further characterized in that,

[0008] The coarse slag conveying mechanism includes a coarse slag conveying belt, one end of which is located at the outlet of the dewatering screen, and the other end of which is located above the separation unit.

[0009] The separation unit includes a separation hopper, which is located below the coarse slag conveyor belt. The separation hopper is connected to a three-way valve for material distribution. One outlet end of the separation hopper is located above the coarse slag stockpile, and the other outlet end of the separation hopper is connected to the coarse slag silo.

[0010] The primary mixing mechanism includes a primary fine slurry buffer tank, which is located at the outlet of the dewatering screen. The primary fine slurry buffer tank is connected to a primary fine slurry agitator and is connected to the secondary mixing mechanism.

[0011] The secondary mixing mechanism includes a secondary fine slurry buffer tank, which is connected to a secondary fine slurry agitator. The secondary fine slurry buffer tank is connected to the primary fine slurry buffer tank via a primary fine slurry conveying pump. A filter press unit is connected between the secondary fine slurry buffer tank and the fine slurry conveying belt.

[0012] The filter press unit includes a filter press feed pump, which is connected to a secondary fine slurry buffer tank. The filter press feed pump is connected to a plate and frame filter press, and the outlet of the plate and frame filter press is located above the fine slurry conveyor belt.

[0013] The secondary fine slurry buffer tank is connected to a settling tank via a black water transfer pump.

[0014] A rinsing nozzle is provided on one side of the dewatering screen.

[0015] Another technical solution adopted in this invention is: a solid waste recovery method for a circulating fluidized bed boiler co-gasification coal gasification device, which is implemented according to the following steps: Step 1. The coarse slag output from the slag remover is dewatered by the dewatering screen and enters the coarse slag conveyor belt, while the fine slag slurry enters the primary fine slag slurry buffer tank. Step 2. The coarse slag on the coarse slag conveyor belt is sent to the separation hopper, and the coarse slag is separated into the coarse slag stockpile or coarse slag silo through the material distribution three-way valve; Step 3. The coarse slag from the coarse slag silo is mixed with the raw coal conveyed by the raw coal conveyor belt in a certain proportion and then enters the boiler for combustion. Step 4. The fine slurry entering the primary fine slurry buffer tank is stirred and mixed evenly by the primary fine slurry agitator, and then transported to the secondary fine slurry buffer tank by the primary fine slurry conveying pump. Step 5. After the black water in the settling tank is mixed with the fine slurry in the secondary fine slurry buffer tank, it is sent to the plate and frame filter press for filtration by the filter press feed pump, and then sent to the fine slurry silo by the fine slurry conveyor belt, where it is blended with the raw coal for combustion.

[0016] The beneficial effects of this invention are: This invention relates to a solid waste recovery device for circulating fluidized bed boilers and coal gasification. Through the coordinated operation of the circulating fluidized bed boiler and the coal gasification unit, the resource utilization of coarse and fine slag from coal gasification is realized. Compared with existing landfill treatment methods, this reduces solid waste disposal costs, reduces environmental pressure, recovers residual carbon resources from solid waste, improves energy utilization efficiency, and reuses the dehydrated water in the coal gasification unit, thus realizing the recycling of water resources. Attached Figure Description

[0017] Figure 1 This is a simplified structural diagram of the solid waste recovery device for co-gasification of a circulating fluidized bed boiler according to the present invention.

[0018] In the diagram: 1. Slag remover; 2. Flushing nozzle; 3. Dewatering screen; 4. Coarse slag conveyor belt; 5. Three-way valve for material distribution; 6. Primary fine slag slurry agitator; 7. Primary fine slag slurry buffer tank; 8. Primary fine slag slurry conveying pump; 9. Settling tank; 10. Black water conveying pump; 11. Secondary fine slag slurry agitator; 12. Secondary fine slag slurry buffer tank; 13. Filter press feed pump; 14. Plate and frame filter press; 15. Fine slag conveyor belt; 16. Fine slag silo; 17. Coarse slag silo; 18. Raw coal conveyor belt; 19. Coarse slag stockpile. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] This invention provides a solid waste recovery device for co-gasification of circulating fluidized bed boilers, such as... Figure 1As shown, the system includes a slag remover 1, with a dewatering screen 3 connected to its outlet. The outlet of the dewatering screen 3 is equipped with a coarse slag conveying mechanism and a primary mixing mechanism. The coarse slag conveying mechanism is connected to a coarse slag storage yard 19 and a coarse slag silo 17 via a separation unit. A raw coal conveying belt 18 is located below the coarse slag silo 17. A secondary mixing mechanism is connected to the primary mixing mechanism. A fine slag conveying belt 15 is located at the outlet of the secondary mixing mechanism, and a fine slag silo 16 is located at the end of the fine slag conveying belt 15, positioned above the raw coal conveying belt 18. The coarse slag output from the slag remover 1 has a moisture content of 65%-70%. After dewatering by the dewatering screen 3, the moisture content of the coarse slag is reduced to approximately 35%. It is then conveyed to the coarse slag silo 17 via the coarse slag conveying mechanism and mixed with the raw coal conveyed by the raw coal conveying belt 18 in a specific ratio before entering the boiler for combustion. The fine slurry with a solid content of 10%-20% produced by the dewatering screen 3 is processed by the primary and secondary mixing mechanisms and then by the plate and frame filter press 14 to obtain fine slag with a water content of 35%-40%. The fine slag is conveyed by the fine slag conveyor belt 15 to the fine slag silo 16 and blended with the raw coal.

[0023] Example 1 The solid waste recovery device for circulating fluidized bed boiler co-gasification includes a slag remover 1. The outlet of the slag remover 1 is connected to a dewatering screen 3. The outlet of the dewatering screen 3 is equipped with a coarse slag conveying mechanism and a primary stirring mechanism. The coarse slag conveying mechanism is connected to a coarse slag stockpile 19 and a coarse slag silo 17 through a separation unit. A raw coal conveying belt 18 is provided below the coarse slag silo 17. The primary stirring mechanism is connected to a secondary stirring mechanism. A fine slag conveying belt 15 is provided at the outlet end of the secondary stirring mechanism. A fine slag silo 16 is provided at the end of the fine slag conveying belt 15 and is located above the raw coal conveying belt 18.

[0024] The coarse slag conveying mechanism includes a coarse slag conveyor belt 4. One end of the coarse slag conveyor belt 4 is located at the outlet of the dewatering screen 3, and the other end of the coarse slag conveyor belt 4 is located above the separation unit. The coarse slag conveyor belt 4 is connected to the conveyor frame and is powered by a motor. The coarse slag after dewatering by the dewatering screen 3 is conveyed to the coarse slag silo 17 via the coarse slag conveyor belt 4.

[0025] Example 2 The solid waste recovery device for circulating fluidized bed boiler co-gasification includes a slag remover 1. The outlet of the slag remover 1 is connected to a dewatering screen 3. The outlet of the dewatering screen 3 is equipped with a coarse slag conveying mechanism and a primary stirring mechanism. The coarse slag conveying mechanism is connected to a coarse slag stockpile 19 and a coarse slag silo 17 through a separation unit. A raw coal conveying belt 18 is provided below the coarse slag silo 17. The primary stirring mechanism is connected to a secondary stirring mechanism. A fine slag conveying belt 15 is provided at the outlet end of the secondary stirring mechanism. A fine slag silo 16 is provided at the end of the fine slag conveying belt 15 and is located above the raw coal conveying belt 18.

[0026] The coarse slag conveying mechanism includes a coarse slag conveying belt 4, one end of which is located at the outlet of the dewatering screen 3, and the other end of which is located above the separation unit.

[0027] The separation unit includes a separation hopper positioned below the coarse slag conveyor belt 4. The separation hopper is connected to a three-way distribution valve 5. One outlet of the separation hopper is located above the coarse slag stockpile 19, and the other outlet is connected to the coarse slag silo 17. Depending on actual usage requirements, the coarse slag conveyed by the coarse slag conveyor belt 4 falls into the separation hopper, and the three-way distribution valve 5 separates the coarse slag into the coarse slag stockpile 19 or the coarse slag silo 17.

[0028] Example 3 The solid waste recovery device for circulating fluidized bed boiler co-gasification includes a slag remover 1. The outlet of the slag remover 1 is connected to a dewatering screen 3. The outlet of the dewatering screen 3 is equipped with a coarse slag conveying mechanism and a primary stirring mechanism. The coarse slag conveying mechanism is connected to a coarse slag stockpile 19 and a coarse slag silo 17 through a separation unit. A raw coal conveying belt 18 is provided below the coarse slag silo 17. The primary stirring mechanism is connected to a secondary stirring mechanism. A fine slag conveying belt 15 is provided at the outlet end of the secondary stirring mechanism. A fine slag silo 16 is provided at the end of the fine slag conveying belt 15 and is located above the raw coal conveying belt 18.

[0029] The coarse slag conveying mechanism includes a coarse slag conveying belt 4, one end of which is located at the outlet of the dewatering screen 3, and the other end of which is located above the separation unit.

[0030] The separation unit includes a separation hopper, which is located below the coarse slag conveyor belt 4. The separation hopper is connected to a three-way distribution valve 5. One outlet end of the separation hopper is located above the coarse slag stockpile 19, and the other outlet end of the separation hopper is connected to the coarse slag silo 17.

[0031] The primary mixing mechanism includes a primary fine slurry buffer tank 7, which is located at the outlet of the dewatering screen 3. The primary fine slurry buffer tank 7 is connected to a primary fine slurry agitator 6, and is also connected to the secondary mixing mechanism. The fine slurry produced by the dewatering screen 3 enters the primary fine slurry buffer tank 7, is mixed evenly by the primary fine slurry agitator 6, and then enters the secondary mixing mechanism.

[0032] Example 4 The solid waste recovery device for circulating fluidized bed boiler co-gasification includes a slag remover 1. The outlet of the slag remover 1 is connected to a dewatering screen 3. The outlet of the dewatering screen 3 is equipped with a coarse slag conveying mechanism and a primary stirring mechanism. The coarse slag conveying mechanism is connected to a coarse slag stockpile 19 and a coarse slag silo 17 through a separation unit. A raw coal conveying belt 18 is provided below the coarse slag silo 17. The primary stirring mechanism is connected to a secondary stirring mechanism. A fine slag conveying belt 15 is provided at the outlet end of the secondary stirring mechanism. A fine slag silo 16 is provided at the end of the fine slag conveying belt 15 and is located above the raw coal conveying belt 18.

[0033] The coarse slag conveying mechanism includes a coarse slag conveying belt 4, one end of which is located at the outlet of the dewatering screen 3, and the other end of which is located above the separation unit.

[0034] The separation unit includes a separation hopper, which is located below the coarse slag conveyor belt 4. The separation hopper is connected to a three-way distribution valve 5. One outlet end of the separation hopper is located above the coarse slag stockpile 19, and the other outlet end of the separation hopper is connected to the coarse slag silo 17.

[0035] The primary mixing mechanism includes a primary fine slurry buffer tank 7, which is located at the outlet of the dewatering screen 3. The primary fine slurry buffer tank 7 is connected to a primary fine slurry agitator 6, and the primary fine slurry buffer tank 7 is connected to the secondary mixing mechanism.

[0036] The secondary mixing mechanism includes a secondary fine slurry buffer tank 12, which is connected to a secondary fine slurry agitator 11. The secondary fine slurry buffer tank 12 is connected to a primary fine slurry buffer tank 7 via a primary fine slurry delivery pump 8. A filter press unit is connected between the secondary fine slurry buffer tank 12 and the fine slurry conveyor belt 15. The fine slurry output from the primary fine slurry buffer tank 7 enters the secondary fine slurry buffer tank 12 via the primary fine slurry delivery pump 8, is uniformly mixed by the secondary fine slurry agitator 11, and then undergoes filter pressing treatment after being output.

[0037] Example 5 The solid waste recovery device for circulating fluidized bed boiler co-gasification includes a slag remover 1. The outlet of the slag remover 1 is connected to a dewatering screen 3. The outlet of the dewatering screen 3 is equipped with a coarse slag conveying mechanism and a primary stirring mechanism. The coarse slag conveying mechanism is connected to a coarse slag stockpile 19 and a coarse slag silo 17 through a separation unit. A raw coal conveying belt 18 is provided below the coarse slag silo 17. The primary stirring mechanism is connected to a secondary stirring mechanism. A fine slag conveying belt 15 is provided at the outlet end of the secondary stirring mechanism. A fine slag silo 16 is provided at the end of the fine slag conveying belt 15 and is located above the raw coal conveying belt 18.

[0038] The coarse slag conveying mechanism includes a coarse slag conveying belt 4, one end of which is located at the outlet of the dewatering screen 3, and the other end of which is located above the separation unit.

[0039] The separation unit includes a separation hopper, which is located below the coarse slag conveyor belt 4. The separation hopper is connected to a three-way distribution valve 5. One outlet end of the separation hopper is located above the coarse slag stockpile 19, and the other outlet end of the separation hopper is connected to the coarse slag silo 17.

[0040] The primary mixing mechanism includes a primary fine slurry buffer tank 7, which is located at the outlet of the dewatering screen 3. The primary fine slurry buffer tank 7 is connected to a primary fine slurry agitator 6, and the primary fine slurry buffer tank 7 is connected to the secondary mixing mechanism.

[0041] The secondary mixing mechanism includes a secondary fine slurry buffer tank 12, which is connected to a secondary fine slurry agitator 11. The secondary fine slurry buffer tank 12 is connected to the primary fine slurry buffer tank 7 via a primary fine slurry conveying pump 8. A filter press unit is connected between the secondary fine slurry buffer tank 12 and the fine slurry conveying belt 15.

[0042] The filter press unit includes a filter press feed pump 13, which is connected to a secondary fine slurry buffer tank 12. The filter press feed pump 13 is also connected to a plate and frame filter press 14, with its outlet positioned above the fine slurry conveyor belt 15. The fine slurry output from the secondary fine slurry buffer tank 12 is fed into the plate and frame filter press 14 by the filter press feed pump 13 for filtration. After filtration, the moisture content of the fine slurry is reduced to 35%-40%, and then it falls onto the fine slurry conveyor belt 15. The fine slurry conveyor belt is also supported by a bracket and powered by a motor. The clarified liquid produced during filtration is returned to the coal gasification unit for recycling, thus achieving water resource recovery.

[0043] Example 6 The solid waste recovery device for circulating fluidized bed boiler co-gasification includes a slag remover 1. The outlet of the slag remover 1 is connected to a dewatering screen 3. The outlet of the dewatering screen 3 is equipped with a coarse slag conveying mechanism and a primary stirring mechanism. The coarse slag conveying mechanism is connected to a coarse slag stockpile 19 and a coarse slag silo 17 through a separation unit. A raw coal conveying belt 18 is provided below the coarse slag silo 17. The primary stirring mechanism is connected to a secondary stirring mechanism. A fine slag conveying belt 15 is provided at the outlet end of the secondary stirring mechanism. A fine slag silo 16 is provided at the end of the fine slag conveying belt 15 and is located above the raw coal conveying belt 18.

[0044] The coarse slag conveying mechanism includes a coarse slag conveying belt 4, one end of which is located at the outlet of the dewatering screen 3, and the other end of which is located above the separation unit.

[0045] The separation unit includes a separation hopper, which is located below the coarse slag conveyor belt 4. The separation hopper is connected to a three-way distribution valve 5. One outlet end of the separation hopper is located above the coarse slag stockpile 19, and the other outlet end of the separation hopper is connected to the coarse slag silo 17.

[0046] The primary mixing mechanism includes a primary fine slurry buffer tank 7, which is located at the outlet of the dewatering screen 3. The primary fine slurry buffer tank 7 is connected to a primary fine slurry agitator 6, and the primary fine slurry buffer tank 7 is connected to the secondary mixing mechanism.

[0047] The secondary mixing mechanism includes a secondary fine slurry buffer tank 12, which is connected to a secondary fine slurry agitator 11. The secondary fine slurry buffer tank 12 is connected to the primary fine slurry buffer tank 7 via a primary fine slurry conveying pump 8. A filter press unit is connected between the secondary fine slurry buffer tank 12 and the fine slurry conveying belt 15.

[0048] The filter press unit includes a filter press feed pump 13, which is connected to a secondary fine slurry buffer tank 12. The filter press feed pump 13 is connected to a plate and frame filter press 14, and the outlet of the plate and frame filter press 14 is located above the fine slurry conveyor belt 15.

[0049] The secondary fine slurry buffer tank 12 is connected to a settling tank 9 via a black water transfer pump 10. The black water with a solid content of 5%-10% discharged from the bottom of the settling tank 9 is transported to the secondary fine slurry buffer tank 12 by the black water transfer pump 10, mixed with the fine slurry therein, and then pumped into the plate and frame filter press 14 by the filter press feed pump 13.

[0050] Example 7 The solid waste recovery device for circulating fluidized bed boiler co-gasification includes a slag remover 1. The outlet of the slag remover 1 is connected to a dewatering screen 3. The outlet of the dewatering screen 3 is equipped with a coarse slag conveying mechanism and a primary stirring mechanism. The coarse slag conveying mechanism is connected to a coarse slag stockpile 19 and a coarse slag silo 17 through a separation unit. A raw coal conveying belt 18 is provided below the coarse slag silo 17. The primary stirring mechanism is connected to a secondary stirring mechanism. A fine slag conveying belt 15 is provided at the outlet end of the secondary stirring mechanism. A fine slag silo 16 is provided at the end of the fine slag conveying belt 15 and is located above the raw coal conveying belt 18.

[0051] The coarse slag conveying mechanism includes a coarse slag conveying belt 4, one end of which is located at the outlet of the dewatering screen 3, and the other end of which is located above the separation unit.

[0052] The separation unit includes a separation hopper, which is located below the coarse slag conveyor belt 4. The separation hopper is connected to a three-way distribution valve 5. One outlet end of the separation hopper is located above the coarse slag stockpile 19, and the other outlet end of the separation hopper is connected to the coarse slag silo 17.

[0053] The primary mixing mechanism includes a primary fine slurry buffer tank 7, which is located at the outlet of the dewatering screen 3. The primary fine slurry buffer tank 7 is connected to a primary fine slurry agitator 6, and the primary fine slurry buffer tank 7 is connected to the secondary mixing mechanism.

[0054] The secondary mixing mechanism includes a secondary fine slurry buffer tank 12, which is connected to a secondary fine slurry agitator 11. The secondary fine slurry buffer tank 12 is connected to the primary fine slurry buffer tank 7 via a primary fine slurry conveying pump 8. A filter press unit is connected between the secondary fine slurry buffer tank 12 and the fine slurry conveying belt 15.

[0055] The filter press unit includes a filter press feed pump 13, which is connected to a secondary fine slurry buffer tank 12. The filter press feed pump 13 is connected to a plate and frame filter press 14, and the outlet of the plate and frame filter press 14 is located above the fine slurry conveyor belt 15.

[0056] The secondary fine slurry buffer tank 12 is connected to a settling tank 9 via a black water transfer pump 10.

[0057] A rinsing nozzle 2 is provided on one side of the dewatering screen 3. The rinsing nozzle 2 is connected to an external water source through a rinsing water pipe to thoroughly rinse the fine residue inside the dewatering screen 3.

[0058] Example 8 The solid waste recovery method of the circulating fluidized bed boiler co-gasification coal gasification solid waste recovery device is implemented according to the following steps: Step 1. The coarse slag output from the slag remover 1 is dewatered by the dewatering screen 3, and the output coarse slag enters the coarse slag conveyor belt 4, while the fine slag slurry enters the primary fine slag slurry buffer tank 7. Step 2. The coarse slag on the coarse slag conveyor belt 4 is sent to the separation hopper, and the coarse slag is separated into the coarse slag stockpile 19 or coarse slag silo 17 through the material distribution three-way valve 5. Step 3. The coarse slag from the coarse slag silo 17 and the raw coal conveyed by the raw coal conveyor belt 18 are mixed in proportion and then fed into the boiler for combustion. Step 4. The fine slurry entering the primary fine slurry buffer tank 7 is stirred and mixed evenly by the primary fine slurry agitator 6, and then transported to the secondary fine slurry buffer tank 12 by the primary fine slurry conveying pump 8. Step 5. After the black water in the settling tank 9 is mixed with the fine slurry in the secondary fine slurry buffer tank 12, it is sent to the plate and frame filter press 14 for filter pressing by the filter press feed pump 13, and then sent to the fine slurry silo 16 by the fine slurry conveyor belt 15 for co-firing with the raw coal.

[0059] The working principle of the solid waste recovery device for co-gasification of circulating fluidized bed boilers in this invention is as follows: The coarse slag with a moisture content of 65%-70% output from the slag remover 1 is dewatered by the dewatering screen 3 and then conveyed to the separation hopper by the coarse slag conveyor belt 4. The coarse slag is then separated into the coarse slag stockpile 19 or the coarse slag silo 17 by the distribution three-way valve 5. The coarse slag in the coarse slag silo 17 is mixed with the raw coal conveyed by the raw coal conveyor belt 18 in a certain proportion and then enters the boiler for combustion. The fine slag slurry with a solid content of 10%-20% produced by the dewatering screen 3 enters the primary fine slag slurry buffer tank 7. After being stirred and mixed evenly by the primary fine slag slurry agitator 6, it is then conveyed by the primary fine slag slurry pump. The black water with a solid content of 5%-10% discharged from the bottom of the settling tank 9 is transported to the secondary fine slurry buffer tank 12 by the black water conveying pump 10. After mixing with the fine slurry, it is sent to the plate and frame filter press 14 by the filter press feed pump 13 for filter pressing. The moisture content of the fine slurry obtained after filter pressing is reduced to 35%-40%. It is sent to the fine slurry silo 16 by the fine slurry conveying belt 15, and then falls into the raw coal conveying belt 18 to be co-fired with the raw coal. The clear liquid produced by filter pressing is returned to the coal gasification unit for recycling, realizing the recovery of water resources.

[0060] This invention relates to a solid waste recovery device for circulating fluidized bed boilers and coal gasification. Utilizing the process characteristics of circulating fluidized bed boilers, the device performs deep dehydration treatment on the coarse and fine slag produced during coal gasification. The dehydrated water is reused in the coal gasification unit. The dehydrated solid waste is co-fired with the boiler's raw coal in a certain proportion, thereby realizing the recovery and utilization of carbon resources, reducing solid waste disposal costs, alleviating environmental pressure, and improving the overall benefits of enterprises.

Claims

1. A solid waste recovery device for circulating fluidized bed boiler co-gasification, characterized in that, The system includes a slag remover (1), the outlet of which is connected to a dewatering screen (3). The outlet of the dewatering screen (3) is provided with a coarse slag conveying mechanism and a primary mixing mechanism. The coarse slag conveying mechanism is connected to a coarse slag stockpile (19) and a coarse slag silo (17) through a separation unit. A raw coal conveying belt (18) is provided below the coarse slag silo (17). The primary mixing mechanism is connected to a secondary mixing mechanism. A fine slag conveying belt (15) is provided at the outlet end of the secondary mixing mechanism. A fine slag silo (16) is provided at the end of the fine slag conveying belt (15). The fine slag silo (16) is located above the raw coal conveying belt (18).

2. The solid waste recovery device for co-gasification of circulating fluidized bed boiler as described in claim 1, characterized in that, The coarse slag conveying mechanism includes a coarse slag conveying belt (4), one end of which is located at the outlet of the dewatering screen (3), and the other end of which is located above the separation unit.

3. The solid waste recovery device for co-gasification of circulating fluidized bed boiler as described in claim 2, characterized in that, The separation unit includes a separation hopper, which is located below the coarse slag conveyor belt (4). The separation hopper is connected to a three-way valve (5). One outlet of the separation hopper is located above the coarse slag stockpile (19), and the other outlet of the separation hopper is connected to the coarse slag silo (17).

4. The solid waste recovery device for co-gasification of circulating fluidized bed boiler as described in claim 1, characterized in that, The primary mixing mechanism includes a primary fine slurry buffer tank (7), which is located at the outlet of the dewatering screen (3). The primary fine slurry buffer tank (7) is connected to a primary fine slurry agitator (6), and the primary fine slurry buffer tank (7) is connected to the secondary mixing mechanism.

5. The solid waste recovery device for co-gasification of circulating fluidized bed boiler as described in claim 4, characterized in that, The secondary mixing mechanism includes a secondary fine slurry buffer tank (12), which is connected to a secondary fine slurry agitator (11). The secondary fine slurry buffer tank (12) is connected to the primary fine slurry buffer tank (7) via a primary fine slurry conveying pump (8). A filter press unit is connected between the secondary fine slurry buffer tank (12) and the fine slurry conveying belt (15).

6. The solid waste recovery device for co-gasification of circulating fluidized bed boiler as described in claim 5, characterized in that, The filter press unit includes a filter press feed pump (13), which is connected to a secondary fine slurry buffer tank (12). The filter press feed pump (13) is connected to a plate and frame filter press (14), and the outlet of the plate and frame filter press (14) is located above the fine slurry conveying belt (15).

7. The solid waste recovery device for co-gasification of circulating fluidized bed boiler as described in claim 5, characterized in that, The secondary fine slurry buffer tank (12) is connected to a settling tank (9) via a black water transfer pump (10).

8. The solid waste recovery device for co-gasification of circulating fluidized bed boiler as described in claim 7, characterized in that, The dewatering screen (3) is provided with a rinsing nozzle (2) on one side.

9. The solid waste recovery method of the circulating fluidized bed boiler co-gasification solid waste recovery device as described in any one of claims 1-8, characterized in that, The specific steps are as follows: Step 1. The coarse slag output by the slag remover (1) is dewatered by the dewatering screen (3), and the output coarse slag enters the coarse slag conveyor belt (4), while the fine slag slurry enters the primary fine slag slurry buffer tank (7). Step 2. The coarse slag on the coarse slag conveyor belt (4) is sent to the separation hopper, and the coarse slag is separated into the coarse slag stockpile (19) or coarse slag silo (17) through the material distribution three-way valve (5); Step 3. The coarse slag from the coarse slag silo (17) and the raw coal conveyed by the raw coal conveyor belt (18) are mixed in proportion and then fed into the boiler for combustion. Step 4. The fine slurry entering the primary fine slurry buffer tank (7) is stirred and mixed evenly by the primary fine slurry agitator (6), and then transported to the secondary fine slurry buffer tank (12) by the primary fine slurry conveying pump (8). Step 5. After the black water in the settling tank (9) is mixed with the fine slurry in the secondary fine slurry buffer tank (12), it is sent to the plate and frame filter press (14) by the filter press feed pump (13) for filter pressing treatment, and then sent to the fine slurry silo (16) by the fine slurry conveyor belt (15) for co-firing with the raw coal.

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