Coal-fired cfb boiler coupled with general industrial solid waste feeding device

Abstract

The utility model discloses a kind of coal-fired CFB boiler coupling general industrial solid waste feeding device, specifically related to coal-fired coupling solid waste incineration technical field, including coal feeder and boiler, further including mixing pipe, and the air inlet inside one end of its axial fixedly installed with injection gun, the injection gun is used to send mixed gas to the mixing pipe blowing;General industrial solid waste blanking pipe and raw coal blanking pipe that are close to the air inlet distribution are connected in parallel on the mixing pipe;The other end welding of the mixing pipe axial has reducing pipe, and the port welding of the reducing pipe has the mixed feed pipe that is communicated with the boiler feed inlet;It further includes sealing fan, and its input end fixedly communicated with a primary hot air main pipe.The utility model effectively prevents smoke backflow and equipment blockage by independent conveying path design, realizes energy reduction substitution using high-calorific-value solid waste to replace part of coal, significantly improves solid waste blending combustion ratio and promotes green economic development.

Description

Technical Field

[0001] This utility model relates to the field of coal-fired solid waste incineration technology, specifically to a coal-fired CFB boiler coupled with a general industrial solid waste feeding device. Background Technology

[0002] General industrial solid waste refers to non-hazardous solid waste generated from industrial production, transportation, postal and telecommunications industries. Examples include waste textiles, waste wood, waste leather, waste sponges, and waste bamboo products. These materials are characterized by their low density and high calorific value, around 4500 kcal, equivalent to three-quarters that of coal. If coal-fired boilers use some general industrial solid waste as fuel, not only can the cost of raw coal be reduced, but also the disposal fees for the general industrial solid waste can be collected, increasing revenue. Simultaneously, SO2 and NOx emissions can be reduced. x The generation of particulate matter and ash is reduced. For coal-fired power plants, co-firing non-coal, low-carbon general industrial alternative fuels in coal-fired power units can significantly reduce unit electricity costs and carbon emissions. This has important strategic significance in promoting energy conservation and emission reduction and achieving green development, and is expected to become one of the important ways to transform and upgrade the power industry, control costs, and promote the low-carbon development of coal-fired power.

[0003] Because solid waste co-firing with coal-fired power generation has a promising future, more and more coal-fired power plants are attempting to retrofit their existing boilers to enable the co-firing of general industrial solid waste. However, the following problems have been encountered during the retrofitting process:

[0004] 1. Due to space limitations in front of the furnace, it is not easy to add a separate solid waste feed pipe.

[0005] 2. The specific gravity of general industrial solid waste is still relatively small compared to coal, and its suppressive effect on the positive pressure flue gas in the furnace is also relatively weak. Since the design of the feeding device must consider sufficient porosity to ensure smooth fuel feeding and prevent fuel blockage during the feeding process, the existence of voids in the feeding device can easily cause backflow of positive pressure flue gas in the furnace. For general industrial solid waste with a relatively small specific gravity, how to prevent backflow of high-temperature flue gas in the furnace while ensuring sufficient porosity has always been an urgent problem to be solved.

[0006] 3. If existing coal bunkers and coal feeders are used to transport general industrial solid waste, it is easy to cause coal bunker bridging and coal feeder blockage, or even prevent the transport from being completed.

[0007] In summary, a good solution is needed to address these issues so that general industrial solid waste can be used for coal-fired power generation. Utility Model Content

[0008] The purpose of this invention is to provide a coal-fired CFB boiler coupled with a general industrial solid waste feeding device to solve the above-mentioned problems.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A coal-fired CFB boiler coupled with a general industrial solid waste feeding device includes a coal feeder and a boiler, and also includes a mixing pipe with a spray gun fixedly installed in the air inlet at one axial end of the pipe. The spray gun is used to blow mixed gas into the mixing pipe.

[0011] The mixing pipe is connected in parallel to a general industrial solid waste discharge pipe and a raw coal discharge pipe located near the air inlet.

[0012] A reducing pipe is welded to the other end of the mixing pipe along the axial direction, and a mixing feed pipe connected to the boiler feed inlet is welded to the end of the reducing pipe.

[0013] It also includes a sealing fan, whose input end is fixedly connected to a primary hot air header, and whose first output end is connected to the spray gun. The second output end is fixedly connected to a material feeding device, and the output end of the material feeding device is connected in parallel to the mixing feed pipe.

[0014] Preferably, the raw coal feeding pipe is connected to the output end of the coal feeder through a first metal compensator fixedly installed at its end, and a first electric slide valve is fixedly installed on the pipeline between the first metal compensator and the coal feeder.

[0015] Preferably, the device also includes a screw feeder for conveying general industrial solid waste, which is fixedly connected to the general industrial solid waste discharge pipe by a second metal compensator and a second electric slide valve.

[0016] Preferably, the mixing tube is arranged at an angle, while the spray gun is located at a high position in the vertical direction, and the variable diameter tube is located at a low position in the vertical direction.

[0017] Preferably, a temperature sensor with a detection end extending into the mixing pipe and distributed close to the variable diameter pipe is fixedly installed on the mixing pipe.

[0018] Preferably, the axial direction of the general industrial solid waste discharge pipe and the raw coal discharge pipe is perpendicular.

[0019] Preferably, the material feeding air device is connected to the second output end of the sealing fan via a third metal compensator fixedly installed at its input end.

[0020] Preferably, a second electrically adjustable damper is fixedly connected to the pipeline between the third metal compensator and the sealing fan.

[0021] Preferably, the spray gun is connected to the first output end of the sealing fan via a fourth metal compensator fixedly installed at its input end.

[0022] Preferably, a first electrically adjustable damper is fixedly connected to the pipeline between the fourth metal compensator and the sealing fan.

[0023] In the above technical solution, the coal-fired CFB boiler coupled with a general industrial solid waste feeding device provided by this utility model has the following beneficial effects:

[0024] 1. It enables dual feeding of raw coal and general industrial solid waste, and has the advantages of small modification, smooth feeding, good sealing, and effective prevention of flue gas backflow.

[0025] 2. Generally, industrial solid waste does not pass through the raw coal bunker and coal feeder, thus avoiding the blockage problem of the raw coal bunker and coal feeder, and increasing the proportion of solid waste co-firing.

[0026] 3. Industrial solid waste generally has a high calorific value, which can replace some coal to a certain extent, thereby reducing energy consumption and promoting green economic development. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0028] Figure 1 A schematic diagram of the structure of a coal-fired CFB boiler coupled with a general industrial solid waste feeding device provided in this embodiment of the utility model;

[0029] Figure 2 Provided for the embodiments of this utility model Figure 1 A schematic diagram of the side view structure;

[0030] Figure 3 This is a schematic diagram of the structure of the mixing tube provided in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Coal feeder; 2. First electric slide gate valve; 3. First metal compensator; 4. Raw coal discharge pipe; 5. Mixing pipe; 6. Reducing pipe; 7. Mixing feed pipe; 8. Screw feeder; 9. Second electric slide gate valve; 10. Second metal compensator; 11. General industrial solid waste discharge pipe; 12. Primary hot air header; 13. Sealing fan; 14. First electric regulating damper; 15. Spray gun; 16. Second electric regulating damper; 17. Third metal compensator; 18. Feeding air device; 19. Boiler; 20. Fourth metal compensator; 21. Temperature sensor. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0034] like Figure 1-3 As shown, a coal-fired CFB boiler coupled with a general industrial solid waste feeding device includes a coal feeder 1 and a boiler 19, and also includes a mixing pipe 5, with a spray gun 15 fixedly installed in the air inlet at one end of its axial direction. The spray gun 15 is used to blow mixed gas into the mixing pipe 5.

[0035] The mixing pipe 5 is connected in parallel to a general industrial solid waste discharge pipe 11 and a raw coal discharge pipe 4, which are located near the air inlet.

[0036] A reducing pipe 6 is welded to the other end of the mixing pipe 5 along the axis, and a mixing feed pipe 7 connected to the feed inlet of the boiler 19 is welded to the end of the reducing pipe 6.

[0037] It also includes a sealing blower 13, whose input end is fixedly connected to a primary hot air header 12, and whose first output end is connected to a spray gun 15. The second output end is fixedly connected to a feeding air device 18, and the output end of the feeding air device 18 is connected in parallel to the mixing feed pipe 7.

[0038] Specifically, the mixing pipe 5 is arranged at an angle, while the spray gun 15 is located at a high vertical position, and the reducing pipe 6 is located at a low vertical position. The outlet of the raw coal discharge pipe 4 is welded to the raw coal inlet of the mixing pipe 5, and the outlet of the general industrial solid waste discharge pipe 11 is welded to the solid waste inlet of the mixing pipe 5. Furthermore, the axial directions of the general industrial solid waste discharge pipe 11 and the raw coal discharge pipe 4 are perpendicular. Figure 1 As shown.

[0039] The outlet of the mixing pipe 5 is welded to the inlet of the reducing pipe 6; the temperature measuring device 21 is installed in the mixing pipe 5; the inlet of the coal spreading air device 18 and the outlet of the sealing fan 13 are connected by an air duct.

[0040] Furthermore, the high-pressure air from the sealing fan 13 is injected into the mixing pipe through the lower nozzle of the spray gun 15, generating a vortex zone in the variable diameter pipe 6, which causes a local negative pressure to form in this area. This has a guiding effect on the material falling into the negative pressure zone from the top, so that the conveyed coal and solid waste mixture can enter the furnace for combustion more smoothly, while effectively preventing the backflow of flue gas in the furnace.

[0041] Secondly, the mixing pipe 5 enables the dual feeding of raw coal and general industrial solid waste into the boiler furnace for combustion. By utilizing the high density of raw coal and mixing it with the low density of general industrial solid waste, the void ratio of the feeding device can be reduced, further reducing the risk of backflow of flue gas during solid waste transportation.

[0042] The above-mentioned technology enables dual feeding of raw coal and general industrial solid waste, and has the advantages of small modification, smooth feeding, good sealing, and effective prevention of flue gas backflow. General industrial solid waste does not pass through the raw coal bunker and coal feeder 2, avoiding the blockage problem of the raw coal bunker and coal feeder 2, and can increase the proportion of solid waste co-firing. In addition, general industrial solid waste has a high calorific value, which can replace part of the coal to a certain extent, realizing energy reduction and substitution to promote green economic development.

[0043] As a further embodiment of this utility model, the raw coal feeding pipe 4 is connected to the output end of the coal feeder 1 through a first metal compensator 3 (the first metal compensator 3 is used to compensate for the interface displacement of the boiler due to thermal expansion and contraction, thereby ensuring the safety of the connection between the feeding equipment and the feeding pipe) fixedly installed at its end, and a first electric slide valve 2 is fixedly installed on the pipeline between the first metal compensator 3 and the coal feeder 1.

[0044] Secondly, it also includes a screw feeder 8 for conveying general industrial solid waste, which is fixedly connected to the general industrial solid waste discharge pipe 11 by a second metal compensator 10 (the second metal compensator 10 is used to compensate for the interface displacement caused by thermal expansion and contraction of the boiler, thereby ensuring the safety of the connection between the feeding equipment and the discharge pipe) and a second electric slide gate valve 9.

[0045] Furthermore, a temperature sensor 21 with its detection end extending into the mixing pipe 5 and distributed near the reducing pipe 6 is fixedly installed on the mixing pipe 5.

[0046] Specifically, the mixing pipe 5 is equipped with a temperature measuring device 21 and a remote transmission function (transmitted to the main control room of the power plant). It is interlocked with the first electric slide gate valve 2 and the second electric slide gate valve 9. Once the temperature of the feeding device is detected to exceed the set value, the first electric slide gate valve 2 and the second electric slide gate valve 9 will immediately shut off, which can effectively prevent the fuel premature combustion caused by flue gas backflow from spreading to the feeding equipment.

[0047] As a further embodiment of this utility model, the feeding air device 18 is connected to the second output end of the sealing fan 13 via a third metal compensator 17 (the third metal compensator 17 is used to compensate for the interface displacement of the boiler due to thermal expansion and contraction, thereby ensuring the safe connection between the sealing fan and the feeding device) fixedly installed at its input end. A second electric regulating damper 16 is fixedly connected to the pipeline between the third metal compensator 17 and the sealing fan 13.

[0048] Specifically, the first electric regulating damper 14 and the second electric regulating damper 16, together with the sealing fan 13, jointly regulate the air volume entering the spray gun and the coal spreading air device.

[0049] As a further embodiment of this utility model, the spray gun 15 is connected to the first output end of the sealing fan 13 (a centrifugal fan that increases air pressure to enhance the sealing performance of the feeding device and provides cooling protection) via a fourth metal compensator 20 fixedly installed at its input end. The fourth metal compensator 20 is used to compensate for interface displacement caused by thermal expansion and contraction of the boiler, thereby ensuring a safe connection between the sealing fan and the feeding device. A first electrically adjustable damper 14 is fixedly connected to the pipeline between the fourth metal compensator 20 and the sealing fan 13.

[0050] It should be noted that the feeding device consisting of the spray gun 15, the reducing pipe 6, and the mixing pipe 5, as well as the first metal compensator 3, the first metal compensator 10, the third metal compensator 17, the first electric slide gate valve 2, the first electric slide gate valve 9, and the coal spreading air device 18, are made of 304 stainless steel (06Cr19Ni10) and have high temperature resistance.

[0051] Secondly, the aforementioned fixed installations and settings can be installed using known connection methods such as welding, bolting, and snap-fitting; while rotating connections and hinged connections are installed using rotary bearings, and sliding connections are installed using sliding bearings. These installation methods are all common knowledge to those skilled in the art, and can be directly determined by those skilled in the art based on the structural characteristics; therefore, they will not be described in detail.

[0052] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A coal-fired CFB boiler coupled with a general industrial solid waste feeding device, comprising a coal feeder (1) and a boiler (19), characterized in that, It also includes a mixing tube (5), with a spray gun (15) fixedly installed inside the air inlet at one end of its axial direction. The spray gun (15) is used to blow mixed gas into the mixing tube (5). The mixing pipe (5) is connected in parallel to a general industrial solid waste discharge pipe (11) and a raw coal discharge pipe (4) located near the air inlet. A reducing pipe (6) is welded to the other end of the mixing pipe (5) along the axial direction, and a mixing feed pipe (7) connected to the feed inlet of the boiler (19) is welded to the port of the reducing pipe (6). It also includes a sealing fan (13), whose input end is fixedly connected to a primary hot air header (12), and whose first output end is connected to the spray gun (15), and whose second output end is fixedly connected to a feeding air device (18), the output end of which is connected in parallel to the mixing feed pipe (7).

2. The coal-fired CFB boiler coupled with a general industrial solid waste feeding device according to claim 1, characterized in that, The raw coal feeding pipe (4) is connected to the output end of the coal feeder (1) through a first metal compensator (3) fixedly installed at its end, and a first electric slide valve (2) is fixedly installed on the pipeline between the first metal compensator (3) and the coal feeder (1).

3. The coal-fired CFB boiler coupled with a general industrial solid waste feeding device according to claim 1, characterized in that, It also includes a screw feeder (8) for conveying general industrial solid waste, which is fixedly connected to the general industrial solid waste discharge pipe (11) by a second metal compensator (10) and a second electric slide valve (9).

4. The coal-fired CFB boiler coupled with a general industrial solid waste feeding device according to claim 1, characterized in that, The mixing tube (5) is arranged at an angle, while the spray gun (15) is located at a high position in the vertical direction, and the variable diameter tube (6) is located at a low position in the vertical direction.

5. The coal-fired CFB boiler coupled with a general industrial solid waste feeding device according to claim 1, characterized in that, A temperature sensor (21) with its detection end extending into the mixing tube (5) and distributed close to the reducing tube (6) is fixedly installed on the mixing tube (5).

6. The coal-fired CFB boiler coupled with a general industrial solid waste feeding device according to claim 1, characterized in that, The general industrial solid waste discharge pipe (11) and the raw coal discharge pipe (4) are perpendicular in axis.

7. A coal-fired CFB boiler coupled with a general industrial solid waste feeding device according to claim 1, characterized in that, The material spreading air device (18) is connected to the second output end of the sealing fan (13) through a third metal compensator (17) fixedly installed at its input end.

8. A coal-fired CFB boiler coupled with a general industrial solid waste feeding device according to claim 7, characterized in that, A second electric regulating damper (16) is fixedly connected to the pipeline between the third metal compensator (17) and the sealing fan (13).

9. A coal-fired CFB boiler coupled with a general industrial solid waste feeding device according to claim 1, characterized in that, The spray gun (15) is connected to the first output end of the sealing fan (13) via a fourth metal compensator (20) fixedly installed at its input end.

10. A coal-fired CFB boiler coupled with a general industrial solid waste feeding device according to claim 9, characterized in that, A first electric regulating damper (14) is fixedly connected to the pipeline between the fourth metal compensator (20) and the sealing fan (13).

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