Sludge coal-water slurry combustion device

Abstract

The application relates to a sludge-water-coal-slurry combustion device, which comprises a pre-combustion chamber, a first air bellow, an outlet end of the first air bellow being fixedly connected with an inlet end of the pre-combustion chamber, a second air bellow, an outlet end of the second air bellow being partially sleeved in the first air bellow and being fixedly connected with the first air bellow, the second air bellow being provided with a front end cover, the front end cover being provided with a through hole, and a spray gun, the spray gun penetrating through the through hole of the front end cover of the second air bellow, and an outlet end of the spray gun being arranged in the pre-combustion chamber. The device is used for burning and treating sludge-water-coal-slurry, and has high combustion efficiency and good energy-saving and emission-reducing effects.

Description

Technical Field

[0001] This invention belongs to the field of burners, specifically relating to a sludge-coal slurry combustion device. Background Technology

[0002] Urban sludge is a byproduct of pollutant transfer and transformation during urban wastewater treatment, and is currently an unavoidable byproduct. In recent years, my country's urban sludge production has continued to grow. In 2013, my country's dry urban sludge production exceeded 6.5 million tons, and it is estimated that by the end of 2022, the national urban wet sludge production (80% moisture content) will reach 60 million tons. How to properly dispose of wastewater treatment plant sludge and effectively utilize it as a new resource, turning waste into treasure, has become an important factor for urban wastewater treatment plants and related departments to improve their technical and management levels, and is also a global concern.

[0003] Sludge treatment generally follows the principles of reduction, stabilization, harmlessness, and resource recovery. Currently, commonly used treatment methods include agricultural utilization, landfilling with other waste, land treatment, and incineration, with incineration accounting for only about 5% of the total sludge treatment volume. However, landfilling and land treatment are only physical disposal methods, and pollutants in the sludge are easily released secondary, causing secondary pollution and failing to eradicate the problem completely. Furthermore, the low calorific value and significant compositional variations of sludge present considerable challenges for incineration. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, the purpose of this application is to provide a sludge-coal slurry combustion device, the specific technical solution of which is as follows:

[0005] A sludge-coal slurry combustion device includes: a pre-combustion chamber; a first air box, the outlet end of the first air box being fixedly connected to the inlet end of the pre-combustion chamber; a second air box, a portion of the outlet end of the second air box being fitted into the interior of the first air box and fixedly connected to the first air box, the second air box having a front end cover with a through hole; and A spray gun passes through a through-hole in the front end cover of the second air box, and its outlet end is located inside the pre-combustion chamber. The spray gun is used to convey sludge-coal slurry into the pre-combustion chamber.

[0006] Optionally, the device includes at least one spray gun, the front end of which is provided with a nozzle, the nozzle being adjustable in position along the axial direction of the spray gun. This prevents the atomized sludge-coal slurry from adhering to the inner wall of the pre-combustion chamber.

[0007] Optionally, the device further includes a duct, the outlet end of which is located inside the pre-combustion chamber; a return cap is installed at the outlet end of the duct, and a gap is maintained between the return cap and the outlet end of the duct. The duct is used to transport pulverized coal, which flows out of the duct and is blocked by the return cap, allowing it to flow out in the opposite direction along the annular gap, thereby mixing with the injected sludge-coal slurry.

[0008] Optionally, a guide plate is provided at the position where the outlet end of the first air box is fixedly connected to the inlet end of the pre-combustion chamber. Through the guiding effect of the guide plate, the air entering the pre-combustion chamber through the first air box is sprayed out along the inner wall of the pre-combustion chamber, thereby reducing the temperature of the inner wall of the pre-combustion chamber.

[0009] Optionally, the second air box is fitted outside the air duct; a swirl vane is provided inside the second air box and along its outlet end, the swirl vane being fixed to the inner sidewall of the second air box and fitted outside the air duct. Through the swirling action of the swirl vane, the air entering the second air box can be uniformly mixed with the sludge-coal slurry and pulverized coal in the pre-combustion chamber.

[0010] Optionally, the device further includes a handwheel, which is connected to one end of the swirl blade via a screw. By controlling the handwheel, the position of the swirl blade can be adjusted, thereby adjusting the swirl intensity of the air blown out by the swirl blade, which prolongs the suspension residence time of the mixture of sludge-coal slurry and pulverized coal inside the pre-combustion chamber for more complete and stable combustion.

[0011] Optionally, the device further includes a second blower, which is connected to the second air box via a pipe. A second regulating valve is also installed on the pipe between the second blower and the second air box. The second regulating valve can adjust the air volume provided by the second blower according to actual needs.

[0012] Optionally, the device further includes a first blower, which is connected to the first air box via a pipe. A first regulating valve is also provided on the pipe between the first blower and the first air box. The first regulating valve can adjust the air volume provided by the first blower according to actual needs.

[0013] Optionally, the device further includes a slurry storage tank, the outlet of which is connected to the inlet of the spray gun via a pipe. A screw pump and a pressurizing device are sequentially installed on the pipe between the slurry storage tank and the spray gun. The screw pump is used to transport sludge-coal slurry, and the pressurizing device can atomize the sludge-coal slurry.

[0014] The device described in this application treats sludge-coal slurry by simultaneously feeding atomized sludge-coal slurry and pulverized coal into the pre-combustion chamber for mixed combustion. It employs air cooling, which significantly reduces the weight of the burner compared to traditional water cooling and other cooling methods, and also provides cooling protection for the inner wall of the pre-combustion chamber. The device is easy to ignite and heats up quickly; the air volume, pulverized coal volume, and sludge-coal slurry volume can all be adjusted according to actual needs, and the furnace temperature and flame length can be regulated to meet specific requirements. The burner exhibits a temperature field that is high at the center and low at the outer edges, while also ensuring stable combustion and high efficiency (over 95%), resulting in excellent energy saving and emission reduction. Attached Figure Description

[0015] Other features and advantages of the present invention are described below, which explains the invention in more detail with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 yes Figure 1 Sectional view of AA.

[0017] The main markings in the attached figures are as follows: 1-Slurry storage tank 2-Screw pump 3-Pressure device 4-Second blower 5-Second regulating valve 6-Second air box 601-Front end cover 7-Swirl vane 8-First blower 9-First regulating valve 10-First air box 11-Spray gun 12-Air duct 13-Return cap 14-Pulverized coal silo 15-Pre-combustion chamber 16-Fuel pump 1601-Oil pipe 17-Handwheel Detailed Implementation To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below. However, it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of the invention.

[0018] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] An embodiment of the present invention will now be described with reference to the accompanying drawings.

[0021] like Figure 1 As shown, the sludge-coal slurry combustion device of this application includes a pre-combustion chamber 15, which is a double-cone pre-combustion chamber. The double-cone pre-combustion chamber includes a front cone 1501 and a rear cone 1502. The front cone 1501 is used for stable combustion, and the rear cone 1502 is used for pressurization and acceleration combustion. Coal powder and sludge-coal slurry are mixed and burned inside the pre-combustion chamber 15. A first air box 10 is fixedly connected to the inlet end of the pre-combustion chamber 15. A second air box 6 is fitted into the interior of the first air box 10 and is fixedly connected to the first air box 10. The second air box 6 has a front end cover 601 with a through hole. A spray gun 11 passes through the through hole of the front end cover of the second air box 6. The outlet end of the spray gun 11 is located inside the pre-combustion chamber 15, and the inlet end of the spray gun 11 is located outside the pre-combustion chamber 15.

[0022] In some embodiments, the device further includes a duct 12, the outlet end of which is located inside the pre-combustion chamber 15, and the inlet end of which is located outside the pre-combustion chamber 15; a return cap 13 is fitted onto the outlet end of the duct 12, and the return cap 13 forms an annular gap with the outer wall of the duct 12; the duct 12 is used to transport pulverized coal, and the pulverized coal flows out of the duct 12, is blocked by the return cap 13, flows out in the opposite direction along the annular gap, and then enters the pre-combustion chamber 15.

[0023] In some embodiments, the combustion device includes at least one spray gun 11, such as Figure 2 As shown, the device described in this embodiment includes two spray guns 11, and the two spray guns 11 are symmetrically arranged along the axial direction of the air duct 12. The spray guns 11 are used to re-atomize the sludge-coal slurry and transport the atomized sludge-coal slurry into the interior of the pre-combustion chamber 15. The front end of the spray gun 11 is provided with a nozzle, and the position of the nozzle can be adjusted along the axial direction of the spray gun 11 to adjust the position of the nozzle entering the pre-combustion chamber 15. Adjusting the nozzle to a suitable position can prevent the atomized sludge-coal slurry from sticking to the inner wall of the pre-combustion chamber 15.

[0024] In some embodiments, such as Figure 2 As shown, the second air box 6 is sleeved on the outside of the air duct 12, and a cavity is formed between the inner wall of the second air box 6 and the outer wall of the air duct 12. A spray gun 11 and an oil pipe 18 are arranged in the cavity, and the oil pipe 18 can be arranged at any position in the cavity.

[0025] In some embodiments, a swirl vane 7 is provided inside the second air box 6 and along the outlet end of the second air box 6. The swirl vane 7 is fixed to the inner side wall of the second air box 6 and is sleeved on the outside of the air duct 12. In this embodiment, the device also includes at least two handwheels 17. The handwheels 17 and one end of the swirl vane 7 are connected by a screw. The position of the swirl vane 7 can be adjusted by controlling the handwheels 17. When the secondary air generated by the second blower 4 enters the second air box 6, the second air box 6 can make the secondary air flow evenly. At the same time, the secondary air has a combustion-supporting effect. After the swirl action of the swirl vane 7, the secondary air is evenly mixed with the sludge-water-coal slurry and coal powder airflow entering the pre-combustion chamber 15, so that the suspension residence time of the sludge-water-coal slurry and coal powder mixture is extended for sufficient and stable combustion.

[0026] In some embodiments, the combustion device further includes a second blower 4, which is connected to the second air box 6 via a pipe. A second regulating valve 5 is also provided on the pipe between the second blower 4 and the second air box 6. The second blower 4 is used to provide secondary air to provide the required oxygen to the pre-combustion chamber 15, thereby achieving the effect of combustion assistance. The second regulating valve 5 is used to regulate the air volume of the secondary air.

[0027] In some embodiments, the combustion device further includes a first air box 10, which is sleeved outside the outlet end of the second air box 6, and the first air box 10 is fixedly connected to the outlet end of the second air box 6. In this embodiment, the first air box 10 and the second air box 6 are fixedly connected by welding.

[0028] The outlet end of the first air box 10 is fixedly connected to the inlet end of the pre-combustion chamber 15. In this embodiment, the outlet end of the first air box 10 and the inlet end of the pre-combustion chamber 15 are fixedly connected by welding. A guide plate is also provided at the position where the outlet end of the first air box 10 and the inlet end of the pre-combustion chamber are connected. The primary air blown out by the first air box 10 is guided by the guide plate to make the primary air entering the pre-combustion chamber 15 flow along the inner wall of the pre-combustion chamber 15, forming a cold air layer against the inner wall of the pre-combustion chamber 15, thereby reducing the wall temperature of the pre-combustion chamber 15 to protect the pre-combustion chamber 15 and prevent the pre-combustion chamber 15 from being affected by excessive temperature.

[0029] In some embodiments, the combustion device further includes a first blower 8, which is connected to the first air box 10 via a pipe, and a first regulating valve 9 is provided on the pipe between the first blower 8 and the first air box 10; the first blower 8 is used to provide primary air, and the first regulating valve 9 is used to regulate the air volume of the primary air.

[0030] In some embodiments, the combustion device further includes a slurry storage tank 1 for storing sludge-coal slurry. The slurry storage tank 1 is equipped with a stirring device that operates continuously during operation to slow down the sedimentation process of the sludge-coal slurry in the storage tank 1. The outlet of the slurry storage tank 1 is connected to the inlet of the screw pump 2 via a pipeline. The outlet of the screw pump 2 is connected to a pressurizing device 3 via a pipeline. The pressurizing device 3 is then connected to the spray gun 11 via a pipeline. The pressurizing device 3 pressurizes and atomizes the sludge-coal slurry. The sludge-coal slurry is sent from the outlet of the slurry storage tank 1 to the screw pump 2 and then enters the pressurizing device 3. The pressurizing device 3 pressurizes and atomizes the sludge-coal slurry and sends the atomized sludge-coal slurry to the spray gun 11, where it is then atomized and sprayed into the pre-combustion chamber 15. The combustion device described in this embodiment includes two spray guns 11. The nozzles are provided at the outlets of the spray guns 11. The nozzles can be adjusted along the axial direction of the spray guns 11. Adjusting the nozzles to a suitable position in the pre-combustion chamber 15 can prevent the sprayed sludge-coal slurry from sticking to the inner wall of the pre-combustion chamber 15, so as to ensure that the sludge-coal slurry is fully combusted.

[0031] In some embodiments, the combustion device further includes a pulverized coal bin 14 for storing pulverized coal. The outlet end of the pulverized coal bin 14 and the inlet end of the duct 12 are connected by a pipe. A return flow cap 13 is fitted onto the outlet end of the duct 12. The return flow cap 13 forms an annular gap with the outer wall of the duct 12. After the pulverized coal flows out of the pulverized coal bin 14, it passes through the duct 12. After encountering the obstruction of the return flow cap 13 at the outlet of the duct 12, it flows out in the opposite direction along the annular gap and enters the pre-combustion chamber 15. The return flow cap 13 reduces the flow rate of the pulverized coal entering the pre-combustion chamber 15 and makes the pulverized coal flow out in the opposite direction, which facilitates mixing with the sludge-coal slurry entering the pre-combustion chamber 15. The outlet end of the duct 12 and the return flow cap 13 are located inside the pre-combustion chamber 15, and the inlet end of the duct 12 is located outside the pre-combustion chamber 15.

[0032] In some embodiments, the combustion device further includes a fuel pump 16, which includes an oil pipe 1601. The front end of the oil pipe 1601 is disposed inside the pre-combustion chamber 15. The fuel pump 16 is used to ignite the pulverized coal gas flow entering the pre-combustion chamber 15.

[0033] When the coal powder co-firing sludge coal-water slurry combustion device described in this application is in operation, the switch of the coal powder silo 14 is turned on, and the coal powder is transported to the air duct 12 by air. The coal powder is slowed down by the return cap 13 and flows out in reverse to the pre-combustion chamber 15. The coal powder entering the pre-combustion chamber 15 is ignited by the fuel pump 16. When the temperature in the pre-combustion chamber 15 rises to above 200°C, the switch of the screw pump 2 is turned on, and the sludge coal-water slurry is transported to the pressurizing device 3 by the screw pump 2. The pressurizing device 3 then pressurizes and atomizes the sludge coal-water slurry and transports it to two spray guns 11. The spray guns 11 then atomize the sludge coal-water slurry and spray it into the interior of the pre-combustion chamber 15. At this time, the atomized sludge coal-water slurry and the coal powder flowing out in reverse by the return cap 13 are evenly mixed by secondary air, thereby igniting the sludge coal-water slurry and realizing the treatment of sludge coal-water slurry. The combustion inside the pre-combustion chamber 15 adopts low-oxygen combustion technology, which has high combustion efficiency.

[0034] The device described in this application treats sludge-coal slurry by simultaneously feeding atomized sludge-coal slurry and pulverized coal into the pre-combustion chamber for mixed combustion. It employs air cooling, which significantly reduces the weight of the burner compared to traditional water cooling and other cooling methods, and also provides cooling protection for the inner wall of the pre-combustion chamber. The device is easy to ignite and heats up quickly; the air volume, pulverized coal volume, and sludge-coal slurry volume can all be adjusted according to actual needs, and the furnace temperature and flame length can be regulated to meet specific requirements. The burner exhibits a temperature field that is high at the center and low at the outer edges, while also ensuring stable combustion and high efficiency (over 95%), resulting in excellent energy saving and emission reduction.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sludge-coal slurry combustion device, characterized in that, include: Pre-combustion chamber; The first air box, the outlet end of the first air box and the inlet end of the pre-combustion chamber are fixedly connected; The second air box has a portion of its outlet end fitted into the interior of the first air box and fixedly connected to it. The second air box has a front end cover with a through hole. The spray gun passes through a hole in the front end cover of the second air box, and the outlet end of the spray gun is located inside the pre-combustion chamber; the front end of the spray gun is provided with a nozzle, and the nozzle can be adjusted along the axial direction of the spray gun. A slurry storage tank, internally equipped with a stirring device; the outlet of the slurry storage tank is connected to the inlet of the spray gun via a pipe; a screw pump and a pressurizing device are sequentially installed on the pipe between the slurry storage tank and the spray gun; and The air duct has its outlet end located inside the pre-combustion chamber; a return cap is installed at the outlet end of the air duct, and a gap is maintained between the return cap and the outlet end of the air duct; the inlet end of the air duct is connected to a pulverized coal silo via a pipe.

2. The sludge-coal slurry combustion device according to claim 1, characterized in that, The device includes at least one spray gun.

3. The sludge-coal slurry combustion device according to claim 1, characterized in that, A guide plate is provided at the position where the outlet end of the first air box is fixedly connected to the inlet end of the pre-combustion chamber.

4. The sludge-coal slurry combustion device according to claim 2, characterized in that, The second air box is fitted outside the air duct; inside the second air box and along the outlet end of the second air box, a swirl vane is provided, the swirl vane is fixed to the inner side wall of the second air box, and the swirl vane is fitted outside the air duct.

5. A sludge-coal slurry combustion device according to claim 4, characterized in that, The device also includes a handwheel, which is connected to one end of the swirl blade via a screw.

6. The sludge-coal slurry combustion device according to claim 1, characterized in that, The device also includes a second blower, which is connected to the second air box via a pipe, and a second regulating valve is installed on the pipe between the second blower and the second air box.

7. The sludge-coal slurry combustion device according to claim 1, characterized in that, The device also includes a first blower, which is connected to the first air box via a pipe, and a first regulating valve is provided on the pipe between the first blower and the first air box.

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