A biomass pyrolysis system and process utilizing boiler high temperature dust removal

Abstract

The present invention provides a biomass pyrolysis system using boiler high-temperature dust removal ash, including a pyrolysis carbonization furnace, a coal-fired boiler and a high-temperature dust collector, wherein the coal-fired boiler is connected to the high-temperature dust collector, and the pyrolysis carbonization furnace is connected to a biomass feeding mechanism, and further includes a feeding end of a high-temperature dust removal ash conveying mechanism connected to the high-temperature dust collector through a pipeline, and a unloading end of the high-temperature dust removal ash conveying mechanism is sealedly connected to the pyrolysis carbonization furnace through a pipeline, and is used to send the received high-temperature dust removal ash into the pyrolysis carbonization furnace, and use the waste heat of the high-temperature dust removal ash to heat the biomass in the pyrolysis carbonization furnace; the inlet of the cyclone dust collector is sealedly connected to the pyrolysis gas outlet of the pyrolysis carbonization furnace through a pipeline, and the outlet of the cyclone dust collector is connected to the coal-fired boiler through a pipeline and a fan, and is used to send the pyrolysis gas generated by the pyrolysis of biomass in the pyrolysis carbonization furnace into the coal-fired boiler. The present invention also provides a biomass pyrolysis process using boiler high-temperature dust removal ash. The present invention has low energy consumption, low carbon emissions, and no condensate treatment problem.

Description

Technical Field

[0001] The invention relates to the field of biomass new energy technology, in particular to a biomass pyrolysis system and process utilizing boiler high-temperature dust removal. Background Art

[0002] Biomass resources are the fourth largest resource on earth after coal, oil and natural gas. They are also one of the most abundant renewable resources on earth and one of the most suitable resources to replace fossil energy. In the context of dual carbon, the development and application of biomass resources has become a hot topic of widespread concern. The power industry is the largest carbon emission industry in my country, accounting for about 46% of the country's carbon emissions, especially coal-fired power plants, which are typical high-energy consumption and high-carbon emission industries. The coupling of biomass pyrolysis and coal-fired boilers for power generation is one of the important ways to achieve carbon emission reduction of coal-fired boilers.

[0003] However, when biomass pyrolysis is coupled with coal-fired boilers for power generation, a large amount of high-temperature dust ash will be produced after combustion in the coal-fired boilers. Therefore, a high-temperature dust collector needs to be installed upstream of the SCR denitrification device to remove the high-temperature dust ash. The high-temperature flue gas after removing the high-temperature dust ash is sent to the SCR denitrification device and the desulfurization system. The amount of high-temperature dust ash accumulated at the bottom of the high-temperature dust collector is large and needs to be cleaned regularly to ensure its normal operation. However, the direct discharge of a large amount of high-temperature dust ash will cause the heat contained in the high-temperature dust ash to be not reasonably utilized, resulting in energy waste.

[0004] Biomass pyrolysis refers to heating biomass raw materials under oxygen-free or oxygen-deficient conditions to achieve pyrolysis reaction, produce pyrolysis charcoal and pyrolysis gas, and produce combustible gas and condensate after the pyrolysis gas is cooled and condensed. The heat source of the biomass pyrolysis system often comes from the combustion of fossil fuels such as natural gas, liquefied petroleum gas, and fuel oil, or directly uses electric heating as a heat source; this heating method causes the biomass pyrolysis system to have high energy consumption or emit a large amount of carbon dioxide. Moreover, the high-temperature pyrolysis gas at the outlet of the pyrolysis carbonization furnace produces condensate such as wood tar and wood vinegar after cooling and condensation. This pyrolysis gas condensation process not only wastes a lot of sensible heat and latent heat, but also brings about the problem of condensate treatment.

[0005] Therefore, in order to solve the problems of high energy consumption, high carbon emission and condensate treatment brought by the traditional biomass pyrolysis system, the present invention designs a biomass pyrolysis system and process which utilizes boiler high temperature to remove dust ash. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a biomass pyrolysis system and process using boiler high-temperature dust removal, aiming to solve the problems raised in the technical background and solve the problems of high energy consumption, high carbon emissions and condensate treatment brought about by traditional biomass pyrolysis systems.

[0007] In order to solve the above technical problems, the first implementation scheme provided by the present invention is to provide a biomass pyrolysis system using boiler high-temperature dust removal, including a pyrolysis carbonization furnace, a coal-fired boiler and a high-temperature dust collector, wherein the coal-fired boiler is connected to the high-temperature dust collector, and the pyrolysis carbonization furnace is sealedly connected to the biomass feeding mechanism through a pipeline, and further includes:

[0008] The high-temperature dust ash conveying mechanism has a feeding end connected to the high-temperature dust collector through a pipeline, and a unloading end sealedly connected to the pyrolysis carbonization furnace through a pipeline. It is used to deliver the received high-temperature dust ash into the pyrolysis carbonization furnace, and use the waste heat of the high-temperature dust ash to heat the biomass in the pyrolysis carbonization furnace.

[0009] The cyclone dust collector is used to remove dust from the pyrolysis biomass. Its inlet is sealedly connected to the pyrolysis gas outlet of the pyrolysis carbonization furnace through a pipeline, and its outlet is connected to the coal-fired boiler through a pipeline and a fan. The fan is used to send the pyrolysis gas generated by the pyrolysis biomass in the pyrolysis carbonization furnace into the coal-fired boiler for reuse.

[0010] Preferably, the pyrolysis carbonization furnace is a rotary carbonization furnace, which includes an inner cylinder and an outer cylinder, and spiral blades are provided on the inner walls of the inner cylinder and the outer cylinder. The inner cylinder and the outer cylinder are rotated by gear transmission or chain transmission, and the discharge end of the high-temperature dust removal ash conveying mechanism is sealed with the outer cylinder, and the inner cylinder is sealed with the biomass feeding mechanism.

[0011] Preferably, the biomass feeding mechanism and the unloading ends of the high-temperature dust removal ash conveying mechanism are respectively located at two ends of the pyrolysis carbonization furnace, and the movement directions of the inner cylinder and the outer cylinder are opposite.

[0012] Preferably, the inner cylinder is connected to a pneumatic conveying device through a pipeline, and the pneumatic conveying device is connected to an ash bin of a power plant, and is used to convey the low-temperature dust removal ash conveyed from the inner cylinder to the ash bin of the power plant for storage.

[0013] Preferably, the outer cylinder is sealed and connected to a cooling mechanism through a pipeline, and the pyrolytic carbon delivered by the cooling mechanism is transported to a coal yard.

[0014] Preferably, the biomass feeding mechanism comprises:

[0015] The feeding conveyor is used to convey biomass.

[0016] Buffer bin, the entrance is connected with the feeding transmission part.

[0017] The conveying mechanism is arranged at the outlet of the buffer bin and is connected to the pyrolysis carbonization furnace.

[0018] Preferably, all of the pipelines are provided with valves.

[0019] Preferably, the high-temperature dust collector is also connected to the SCR denitrification device through a pipeline, and the high-temperature flue gas obtained by dust removal by the high-temperature dust collector is sent to the SCR denitrification device to continue the denitrification reaction.

[0020] The first implementation scheme provided by the present invention is to provide a biomass pyrolysis process using boiler high-temperature dust removal ash, comprising the following steps:

[0021] The biomass is sent to the buffer bin for temporary storage through the feeding transmission part, and the biomass temporarily stored in the buffer bin is sent to the inner cylinder of the pyrolysis carbonization furnace.

[0022] The high-temperature flue gas sent out by the coal-fired boiler is dedusted by a high-temperature dust collector, and the high-temperature dust ash obtained is sent into the outer cylinder of the pyrolysis carbonization furnace through a pipeline and a high-temperature dust ash conveying mechanism.

[0023] When the outer cylinder and the outer cylinder rotate at the same time, the high-temperature dust ash and biomass move in opposite directions under the action of the spiral blades. The high-temperature dust ash transfers heat to the biomass through the inner cylinder wall during the movement of the outer cylinder and the outer cylinder. The pyrolysis gas generated after the pyrolysis of the biomass is sent to the cyclone dust collector through the pipeline for dust removal, and then sent to the coal-fired boiler through the fan to reuse the pyrolysis gas. The dust ash after heat exchange is discharged through the pneumatic conveying equipment, and the pyrolysis carbon generated by the pyrolysis of the biomass is cooled by the cooling mechanism and sent to the coal yard as fuel.

[0024] Preferably, the temperature of the high-temperature pyrolysis gas at the outlet of the pyrolysis carbonization furnace is 250°C to 350°C, and the temperature of the high-temperature dust removal ash is 300°C to 400°C.

[0025] Preferably, the inner cylinder and the outer cylinder are driven by the same driving device, and the driving device adopts variable frequency speed regulation, and the rotation speeds of the inner cylinder and the outer cylinder are both 1r / min to 5r / min.

[0026] Compared with the prior art, the present invention has the following innovative effects:

[0027] 1. The present invention sends the high-temperature flue gas generated by the coal-fired boiler into a high-temperature dust collector to obtain high-temperature dust ash, and then sends the high-temperature dust ash into a pyrolysis carbonization furnace for heating the biomass sent into the pyrolysis carbonization furnace to participate in pyrolysis, thereby providing high-temperature pyrolysis conditions for biomass pyrolysis, replacing the prior art in which biomass pyrolysis relies on fossil fuel electricity heating such as natural gas, liquefied petroleum gas, and fuel oil as a heat source, thereby reducing energy consumption and not emitting carbon dioxide, thereby recycling the energy of the high-temperature dust ash.

[0028] In addition, the pyrolysis gas produced by the pyrolysis carbonization furnace is sent to the furnace of the coal-fired boiler for combustion, providing fuel for the coal-fired boiler and replacing the coal in the existing coal-fired boiler, thereby achieving carbon emission reduction of the coal-fired boiler. Moreover, the pyrolysis gas does not need to be sent to the cooling equipment for cooling. Not only does the system omit the investment in cooling equipment, but it also reuses the pyrolysis gas, thereby improving the utilization rate of the pyrolysis gas. At the same time, there is no need to consider the treatment of the condensate produced by the condensation equipment.

[0029] 2. The present invention sets the pyrolysis carbonization furnace as a rotary carbonization furnace, and places the biomass and high-temperature dust ash in the inner cylinder and the outer cylinder respectively. Through the rotation of the inner cylinder and the outer cylinder and the spiral conveying action of the spiral blades, the high-temperature dust ash and the biomass move in opposite directions, thereby increasing the contact time and contact area of ​​the heat source, thereby making the biomass pyrolysis more complete.

[0030] 3. The present invention sends the pyrolytic carbon produced by pyrolysis to the coal yard after cooling, and sends the pyrolytic gas to the coal-fired boiler, wherein the pyrolytic gas and pyrolytic carbon are both used as low-carbon / zero-carbon fuels to replace the coal in the coal-fired boiler to achieve carbon emission reduction of the coal-fired boiler. The high-temperature dust removal ash participating in the pyrolysis reaction is cooled and sent to the ash storage for reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a process flow chart of a biomass pyrolysis system utilizing boiler high-temperature dust removal ash.

[0032] Description of reference numerals:

[0033] 1. Pyrolysis carbonization furnace; 2. Coal-fired boiler; 3. High-temperature dust collector; 4. High-temperature dust ash conveying mechanism; 5. Cyclone dust collector; 6. Power plant ash storage; 7. Cooling mechanism; 8. Biomass feeding mechanism; 9. Buffer bin; 10. Coal yard; 11. SCR denitrification device. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The inventors have found that biomass uses natural gas, liquefied petroleum gas, fuel oil and other fossil fuels for pyrolysis or directly uses electric heating as a heat source; it will generate high energy consumption and emit a large amount of carbon dioxide. At the same time, the high-temperature pyrolysis gas at the outlet of the pyrolysis carbonization furnace will produce condensate such as wood tar and wood vinegar after cooling and condensation. The condensation of pyrolysis gas not only wastes a lot of sensible heat and latent heat, but also brings about the problem of condensate treatment. In addition, the combustion of coal-fired boilers will produce a large amount of high-temperature dust ash, and direct emission will cause energy waste. Therefore, when biomass pyrolysis is coupled with coal-fired boilers for power generation, it will not only generate a large amount of carbon dioxide and high energy consumption, but also bring about the problem of cold liquid treatment.

[0036] In view of this, the present invention provides a biomass pyrolysis system and process using high-temperature dust removal ash from a boiler. The high-temperature dust removal ash is used as the heat source of the biomass pyrolysis system to pyrolyze the biomass to produce pyrolysis gas and pyrolysis char. The pyrolysis gas is not condensed by a cooling and condensing device, but is directly sent to the boiler for combustion and reuse. The pyrolysis char is sent to a coal yard after cooling. The pyrolysis gas and pyrolysis char are used as low-carbon / zero-carbon fuels to replace coal in coal-fired boilers, so as to achieve carbon emission reduction of coal-fired boilers.

[0037] like Figure 1 As shown, a biomass pyrolysis system using boiler high-temperature dust removal includes a pyrolysis carbonization furnace 1, a coal-fired boiler 2 and a high-temperature dust collector 3, the coal-fired boiler 2 is connected to the high-temperature dust collector 3, the pyrolysis carbonization furnace 1 is sealedly connected to the biomass feeding mechanism through a pipeline, and also includes:

[0038] The feeding end of the high-temperature dust ash conveying mechanism 4 is connected to the high-temperature dust collector 3 through a pipeline. The high-temperature dust collector 3 is arranged between the coal-fired boiler 2 and the SCR denitrification device. The unloading end of the high-temperature dust ash conveying mechanism 4 is sealed and connected to the pyrolysis carbonization furnace 1 through a pipeline, and is used to deliver the received high-temperature dust ash into the pyrolysis carbonization furnace 1, and use the waste heat of the high-temperature dust ash to heat the biomass in the pyrolysis carbonization furnace 1. The high-temperature dust ash conveying mechanism 4 can adopt a screw conveyor, or it can adopt conveying equipment such as buried scraper conveyor, bucket elevator, pipe chain conveyor, or a combination of multiple equipment.

[0039] The cyclone dust collector 5 is used to remove dust from the pyrolysis biomass. The inlet of the cyclone dust collector 5 is sealedly connected to the pyrolysis gas outlet of the pyrolysis carbonization furnace 1 through a pipeline. The outlet of the cyclone dust collector 5 is connected to the coal-fired boiler 2 through a pipeline and a fan. The fan is used to send the pyrolysis gas generated by the pyrolysis biomass in the pyrolysis carbonization furnace 1 into the coal-fired boiler 2 for reuse.

[0040] The present invention sends the high-temperature flue gas generated by the coal-fired boiler 2 into the high-temperature dust collector 3 to obtain high-temperature dust ash, and then sends the high-temperature dust ash into the pyrolysis carbonization furnace 1 for heating the biomass sent into the pyrolysis carbonization furnace 1 to participate in the pyrolysis, thereby providing high-temperature pyrolysis conditions for biomass pyrolysis, replacing the prior art in which biomass pyrolysis relies on fossil fuel electricity heating such as natural gas, liquefied petroleum gas, and fuel oil as a heat source, thereby reducing energy consumption and not emitting carbon dioxide, thereby allowing the energy of the high-temperature dust ash to be recycled.

[0041] In addition, the pyrolysis gas generated by the pyrolysis carbonization furnace 1 is sent to the furnace of the coal-fired boiler 2 for combustion, providing fuel for the coal-fired boiler 2 and replacing the coal of the prior art coal-fired boiler 2, thereby achieving carbon emission reduction of the coal-fired boiler 2, and the pyrolysis gas does not need to be sent to the cooling equipment for cooling. Not only does the system omit the investment in cooling equipment, but the pyrolysis gas is also reused, thereby improving the utilization rate of the pyrolysis gas. At the same time, there is no need to consider the treatment problem of the condensate generated by the condensation equipment.

[0042] Specifically, the pyrolysis carbonization furnace 1 is a rotary carbonization furnace. The pyrolysis carbonization furnace 1 adopts an indirect heating method. The pyrolysis carbonization furnace 1 includes an inner cylinder and an outer cylinder. The inner walls of the inner cylinder and the outer cylinder are both provided with spiral blades. The inner cylinder and the outer cylinder are both rotated by gear transmission or chain transmission. The unloading end of the high-temperature dust removal ash conveying mechanism 4 is sealed and connected to the outer cylinder, and the inner cylinder is sealed and connected to the biomass feeding mechanism.

[0043] The inner and outer cylinders of the pyrolysis carbonization furnace 1 rotate through gear transmission or chain transmission. The biomass enters the front end of the inner cylinder and reaches the rear end of the inner cylinder under the action of the cylinder body rotation and spiral blades. The high-temperature dust ash is sent to one end of the outer cylinder of the pyrolysis carbonization furnace 1 and reaches the other end of the outer cylinder under the action of the cylinder body rotation and spiral blades. In this process, the biochar in the inner cylinder receives the heat provided by the high-temperature dust ash sent into the outer cylinder during the movement and is pyrolyzed. After the biomass is pyrolyzed, high-temperature pyrolysis charcoal and high-temperature pyrolysis gas are produced.

[0044] Specifically, the feeding ends of the biomass feeding mechanism and the high-temperature dust ash conveying mechanism 4 are respectively located at the two ends of the pyrolysis carbonization furnace 1, and the movement directions of the inner cylinder and the outer cylinder are opposite. The movement directions of the inner cylinder and the outer cylinder are opposite so that the biochar in the inner cylinder can receive the heat provided by the high-temperature dust ash fed into the outer cylinder during the movement, while increasing the contact time, which is conducive to full pyrolysis.

[0045] Specifically, the inner cylinder is connected to the pneumatic conveying equipment through a pipeline, and the pneumatic conveying equipment is connected to the power plant ash bin 6, which is used to convey the low-temperature dust removal ash sent out from the inner cylinder and send it to the power plant ash bin 6 for storage. The pneumatic conveying equipment can use dilute phase conveying, such as a material seal pump and a Roots blower, or dense phase conveying, such as a silo pump. The pneumatic conveying equipment here plays the role of conveying low-temperature dust removal ash, and the temperature of the low-temperature dust removal ash is 80℃~150℃.

[0046] Specifically, the outer cylinder is sealed and connected to the cooling mechanism 7 through a pipeline, and the pyrolytic carbon sent by the cooling mechanism 7 is transported to the coal yard 10, wherein the pyrolytic carbon, as a low-carbon / zero-carbon fuel, can replace the coal of the coal-fired boiler 2 to achieve carbon emission reduction of the coal-fired boiler 2. The cooling mechanism 7 can use a water-cooled screw conveyor, or a rotary, fixed or other cooling equipment; it can also use a refrigerant for cooling, and the refrigerant can be cold water, cold air or the like.

[0047] Specifically, the biomass feeding mechanism includes:

[0048] The feeding transmission member 8 is used to transmit biomass; the feeding transmission member 8 can be a belt conveyor, or a conveying device such as a screw conveyor.

[0049] The inlet of the buffer bin 9 is connected to the feeding transmission member 8, which is used to seal the buffered biomass and feed it evenly.

[0050] The conveying mechanism is arranged at the outlet of the buffer bin 9 and is connected to the pyrolysis carbonization furnace 1 , wherein the conveying mechanism is a screw conveyor.

[0051] Specifically, the high-temperature dust collector 3 is also connected to the SCR denitrification device 11 through a pipeline, and the high-temperature flue gas obtained by dust removal by the high-temperature dust collector 3 is sent to the SCR denitrification device 11 to continue the denitrification reaction.

[0052] A biomass pyrolysis process using boiler high-temperature dust removal ash comprises the following steps:

[0053] The biomass is sent to the buffer bin 9 for temporary storage through the feeding transmission part 8, and the biomass temporarily stored in the buffer bin 9 is sent to the inner cylinder of the pyrolysis carbonization furnace 1;

[0054] The high-temperature flue gas sent out by the coal-fired boiler 2 is dedusted by the high-temperature dust collector 3, and the high-temperature dust ash obtained is sent into the outer cylinder of the pyrolysis carbonization furnace 1 through the pipeline and the high-temperature dust ash conveying mechanism 4.

[0055] When the outer cylinder and the outer cylinder rotate at the same time, the high-temperature dust ash and the biomass move in opposite directions under the action of the spiral blades. The high-temperature dust ash transfers heat to the biomass through the inner cylinder wall during the movement of the outer cylinder and the outer cylinder. The pyrolysis gas generated after the pyrolysis of the biomass is sent to the cyclone dust collector 5 through a pipeline for dust removal, and then sent to the coal-fired boiler 2 through a fan to reuse the pyrolysis gas. The dust ash after heat exchange is discharged through pneumatic conveying equipment, and the pyrolysis char generated by the pyrolysis of the biomass is cooled by the cooling mechanism 7 and sent to the coal yard 10 as fuel.

[0056] The high-temperature flue gas obtained by the high-temperature dust collector 3 is sent to the SCR denitrification device 11 to continue the denitrification reaction.

[0057] Specifically, the temperature of the high-temperature pyrolysis gas at the outlet of the pyrolysis carbonization furnace 1 is 250°C to 350°C, and the temperature of the high-temperature dust removal ash is 300°C to 400°C.

[0058] The pyrolysis gas temperature is consistent with the biomass pyrolysis temperature, wherein 250°C to 350°C is the biomass low-temperature pyrolysis temperature, and this temperature is set to ensure that the heat source temperature required for biomass pyrolysis is above 300°C to 400°C.

[0059] Specifically, the inner cylinder and the outer cylinder are driven by the same driving device, and the driving device adopts variable frequency speed regulation, and the rotation speeds of the inner cylinder and the outer cylinder are both 1r / min to 5r / min.

[0060] Working principle:

[0061] The biomass raw material is delivered to the buffer bin 9 via a belt conveyor, and then delivered to the feed port of the pyrolysis carbonization furnace 1 via a screw conveyor at the bottom of the buffer bin 9.

[0062] The temperature of the high temperature dust ash at the bottom outlet of the high temperature dust collector 3 is 300° C. to 400° C. The high temperature dust ash is delivered to the pyrolysis carbonization furnace 1 through the high temperature dust ash delivery mechanism 4 (screw conveyor).

[0063] The pyrolysis carbonization furnace 1 adopts an indirect heating method, and the biomass and high-temperature dust ash enter the inner cylinder and outer cylinder of the pyrolysis carbonization furnace 1 respectively. The pyrolysis carbonization furnace 1 adopts a rotary structure, adopts gear transmission or chain transmission, and the speed can be adjusted. The pyrolysis carbonization furnace 1 adopts a double-cylinder structure of an inner cylinder and an outer cylinder, and spiral blades are provided on both the inner cylinder and the outer cylinder. The biomass enters the front end of the inner cylinder through the inner cylinder screw feeder, reaches the rear end of the inner cylinder under the rotation of the cylinder body and the action of the spiral blades, and receives the heat provided by the high-temperature dust ash of the outer cylinder during the movement for pyrolysis, producing high-temperature pyrolysis charcoal and high-temperature pyrolysis gas. The high-temperature pyrolysis charcoal leaves the pyrolysis carbonization furnace through the inner cylinder spiral discharge, and the high-temperature pyrolysis gas leaves the pyrolysis carbonization furnace 1 from the rear end pipe mouth of the inner cylinder.

[0064] The high-temperature dust ash enters one end of the outer cylinder of the pyrolysis carbonization furnace 1 through the outer cylinder spiral feed, and reaches the other end of the outer cylinder under the rotation of the cylinder and the action of the spiral blades. The high-temperature dust ash moves in the opposite direction to the biomass raw material. During the movement of the outer cylinder, the high-temperature dust ash transfers heat to the biomass raw material through the inner cylinder wall, and the temperature is reduced, and it leaves the pyrolysis carbonization furnace 1 through the outer cylinder spiral discharge. The high-temperature dust ash conveying mechanism 4 and the biomass feeding mechanism have a material sealing function.

[0065] After leaving the pyrolysis carbonization furnace 1, the temperature of the high-temperature pyrolysis carbon is 250° C. to 350° C. After being cooled by a water-cooled screw conveyor, the temperature of the pyrolysis carbon drops below 60° C. The pyrolysis carbon is sent to the coal yard 10 or the raw coal hopper of the power station to become a coal substitute for the coal-fired boiler 2.

[0066] The smoke dust temperature at the outer tube outlet of the pyrolysis carbonization furnace 1 is 80°C to 150°C, and then it is sent to the power plant ash storage 6 through a material seal pump + Roots blower or a silo pump.

[0067] The high temperature pyrolysis gas at the outlet of the pyrolysis carbonization furnace 1 has a temperature of 250℃~350℃ and carries a small amount of carbon powder. The high temperature pyrolysis gas first passes through the cyclone dust collector 5 to remove the large carbon powder particles, and then is transported to the furnace of the coal-fired boiler 2 through the fan to be burned, becoming a coal substitute for the coal-fired boiler 2.

[0068] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A biomass pyrolysis system utilizing boiler high temperature dust removal, comprising a pyrolysis carbonization furnace (1), a coal-fired boiler (2) and a high temperature dust collector (3), characterized in that: The coal-fired boiler (2) is connected to the high-temperature dust collector (3), and the pyrolysis carbonization furnace (1) is sealedly connected to the biomass feeding mechanism through a pipeline, and further comprises: A high-temperature dust removal ash conveying mechanism (4), whose feeding end is connected to the high-temperature dust removal device (3) through a pipeline, and whose unloading end is sealedly connected to the pyrolysis carbonization furnace (1) through a pipeline, is used to convey the received high-temperature dust removal ash into the pyrolysis carbonization furnace (1), and utilize the waste heat of the high-temperature dust removal ash to heat the biomass in the pyrolysis carbonization furnace (1); The cyclone dust collector (5) is used to remove dust from the pyrolysis biomass. Its inlet is sealedly connected to the pyrolysis gas outlet of the pyrolysis carbonization furnace (1) through a pipeline, and its outlet is connected to the coal-fired boiler (2) through a pipeline and a fan. The fan is used to send the pyrolysis gas generated by the pyrolysis biomass in the pyrolysis carbonization furnace (1) into the coal-fired boiler (2) for reuse.

2. A biomass pyrolysis system using boiler high-temperature dust removal ash according to claim 1, characterized in that: The pyrolysis carbonization furnace (1) is a rotary carbonization furnace, comprising an inner cylinder and an outer cylinder, the inner walls of the inner cylinder and the outer cylinder are both provided with spiral blades, the inner cylinder and the outer cylinder are both rotated simultaneously through gear transmission or chain transmission, the discharge end of the high-temperature dust removal ash conveying mechanism (4) is sealedly connected to the outer cylinder, and the inner cylinder is sealedly connected to the biomass feeding mechanism.

3. A biomass pyrolysis system using boiler high-temperature dust removal ash according to claim 2, characterized in that: The biomass feeding mechanism and the unloading ends of the high-temperature dust removal ash conveying mechanism (4) are respectively located at the two ends of the pyrolysis carbonization furnace (1), and the movement directions of the inner cylinder and the outer cylinder are opposite.

4. A biomass pyrolysis system using boiler high-temperature dust removal ash according to claim 2, characterized in that: The inner cylinder is connected to a pneumatic conveying device via a pipeline, and the pneumatic conveying device is connected to an ash bin (6) of a power plant, and is used to convey the low-temperature dust removal ash conveyed from the inner cylinder to the ash bin (6) of the power plant for storage.

5. The biomass pyrolysis system using boiler high-temperature dust removal ash according to claim 2 is characterized in that: The outer cylinder is sealedly connected to a cooling mechanism (7) via a pipeline, and the pyrolytic carbon delivered by the cooling mechanism (7) is transported to a coal yard (10).

6. A biomass pyrolysis system using boiler high-temperature dust removal ash according to claim 2, characterized in that: The biomass feeding mechanism comprises: A feeding transmission member (8) for transmitting biomass; A buffer bin (9), the inlet of which is connected to the feeding transmission member (8); The conveying mechanism is arranged at the outlet of the buffer bin (9), and the conveying mechanism is connected to the pyrolysis carbonization furnace (1).

7. The biomass pyrolysis system using boiler high-temperature dust removal ash according to claim 1, characterized in that: The high-temperature dust collector (3) is also connected to the SCR denitration device (11) via a pipeline.

8. A biomass pyrolysis process using boiler high temperature dust removal ash, characterized in that: The method is based on a biomass pyrolysis system using boiler high-temperature dust removal ash as described in claim 6, and comprises the following steps: The biomass is sent to a buffer bin (9) for temporary storage via a feeding transmission member (8), and the biomass temporarily stored in the buffer bin (9) is sent to an inner cylinder of a pyrolysis carbonization furnace (1); The high-temperature flue gas sent out by the coal-fired boiler (2) is dedusted by the high-temperature dust collector (3), and the high-temperature dust ash obtained is sent into the outer cylinder of the pyrolysis carbonization furnace (1) through the pipeline and the high-temperature dust ash conveying mechanism (4); When the outer cylinder and the outer cylinder rotate simultaneously, the high-temperature dust ash and the biomass move in opposite directions under the action of the spiral blades. The high-temperature dust ash transfers heat to the biomass through the inner cylinder wall during the movement of the outer cylinder and the outer cylinder. The pyrolysis gas generated after the pyrolysis of the biomass is sent to the cyclone dust collector (5) through a pipeline for dust removal, and then sent to the coal-fired boiler (2) through a fan again. The pyrolysis gas is reused, and the dust ash after heat exchange is discharged through a pneumatic conveying device. The pyrolysis char generated by the pyrolysis of the biomass is cooled by a cooling mechanism (7) and sent to the coal yard (10) as fuel.

9. The biomass pyrolysis process using boiler high-temperature dust removal ash according to claim 8, characterized in that: The temperature of the high-temperature pyrolysis gas at the outlet of the pyrolysis carbonization furnace (1) is 250°C to 350°C, and the temperature of the high-temperature dust removal ash is 300°C to 400°C.

10. The biomass pyrolysis process using boiler high-temperature dust removal ash according to claim 8, characterized in that: The inner cylinder and the outer cylinder are driven by the same driving device, and the driving device adopts variable frequency speed regulation. The rotation speeds of the inner cylinder and the outer cylinder are both 1r / min to 5r / min.

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