Boiler waste heat carbon production and biomass co-pipe blending system

Abstract

A kind of boiler waste heat carbonization and biomass co-pipe blending system, the inlet of biomass carbonization and crushing equipment is provided with biomass raw material feed inlet, the gas inlet of biomass carbonization and crushing equipment is connected with hot gas inlet pipe, and the hot gas inlet pipe receives hot gas from boiler tail flue gas or steam waste heat;Powder bin is arranged at the outlet of biomass carbonization and crushing equipment, the powder outlet of powder bin is connected with coal feeder by biomass carbon falling pipe, the outlet of coal feeder is provided with biomass carbon supply pipe, and the biomass carbon supply pipe is connected with primary air supply pipeline and biomass carbon conveying pipeline respectively, the primary air supply pipeline is connected with primary air main pipe, and the other end of biomass carbon conveying pipeline is connected to coal powder mixer, and the outlet of coal powder mixer is connected to boiler coal powder burner by furnace entry primary air pipeline.The utility model avoids the problem of blockage in the process of biomass fuel crushing and conveying, and realizes clean carbon reduction of coal-fired unit.

Description

Technical Field

[0001] This utility model relates to biomass co-firing technology, specifically to a boiler waste heat carbon production and biomass co-firing system, which can be applied to newly built coal-fired units and carbon reduction retrofits of existing units. Background Technology

[0002] Against the backdrop of next-generation coal-fired power technology, new requirements have been placed on clean and carbon-reducing aspects of coal-fired power units. Coal-fired units are the main source of carbon emissions, and failure to meet carbon emission standards can result in numerous penalties. Biomass is a zero-carbon emission fuel, and co-firing biomass with coal is the main means of reducing carbon emissions using biomass. However, due to the wide availability of biomass sources, its long fibers, and significant differences in moisture content, blockages during biomass crushing and transportation lead to less than ideal direct combustion of biomass. Utility Model Content

[0003] The technical problem to be solved by this utility model is: how to solve the blockage problem generated during the crushing and transportation of biomass, and therefore provides a boiler waste heat carbon production and biomass co-firing system.

[0004] To solve the above problems, this utility model is achieved through the following technical solution: A boiler waste heat carbonization and biomass co-firing system includes a biomass carbonization and crushing device. The biomass carbonization and crushing device has a biomass raw material inlet at its inlet and an air inlet connected to a hot air inlet pipe, which receives hot air from the boiler tail flue gas or steam waste heat. A pulverized coal silo is located at the outlet of the biomass carbonization and crushing device. The pulverized coal outlet of the silo is connected to a coal feeder via a biomass carbon drop pipe. A biomass carbon supply pipe is located at the outlet of the coal feeder, connecting to a primary air supply pipe and a biomass carbon conveying pipe. The primary air supply pipe is connected to a primary air main pipe. The other end of the biomass carbon conveying pipe is connected to a pulverized coal mixer. The outlet of the pulverized coal mixer is connected to a boiler pulverized coal burner via a primary air inlet pipe. The other inlet of the pulverized coal mixer is connected to the pulverized coal outlet pipe of a coal mill.

[0005] The biomass carbonization and crushing equipment is connected to the powder silo via a conveyor belt.

[0006] A gate is installed on the biomass carbon discharge pipe.

[0007] Install relevant shut-off valves and regulating valves on the primary air supply duct.

[0008] A quick-closing valve and an adjustable orifice A are installed on the biomass carbon conveying pipeline; a quick-closing valve and an adjustable orifice B are installed on the pulverized coal outlet pipeline of the pulverizer.

[0009] Compared with existing technologies, this invention has the following advantages: This invention utilizes the heat source within the power plant to process biomass raw materials into easily stored and transportable biomass carbon. The carbon powder is then transported via primary air and mixed with pulverized coal at the coal mill outlet, enabling the biomass raw materials to enter the plant and for biomass and pulverized coal to be co-fired. This invention avoids the problems of biomass fuel crushing and blockage during transportation, achieving clean carbon reduction in coal-fired power units. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0012] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0013] like Figure 1 As shown, a boiler waste heat carbonization and biomass co-firing system includes a biomass carbonization and crushing device 1. The inlet of the biomass carbonization and crushing device 1 is provided with a biomass raw material inlet 15. The air inlet of the biomass carbonization and crushing device 1 is connected to a hot air inlet pipe 108, which receives hot air from the waste heat of flue gas or steam at the tail end of the boiler. A powder bin 2 is installed at the outlet of the biomass carbon production and crushing equipment 1. The powder outlet of the powder bin 2 is connected to the coal feeder 4 through the biomass carbon drop pipe 102. A biomass carbon supply pipe 103 is installed at the outlet of the coal feeder 4. The biomass carbon supply pipe 103 is connected to the primary air supply pipe 104 and the biomass carbon conveying pipe 105 respectively. The primary air supply pipe 104 is connected to the primary air main pipe 13. The other end of the biomass carbon conveying pipe 105 is connected to the pulverized coal mixer 12. The outlet of the pulverized coal mixer 12 is connected to the boiler pulverized coal burner 14 through the primary air inlet pipe 107. The other inlet of the pulverized coal mixer 12 is connected to the pulverized coal outlet pipe 106 of the coal mill 9.

[0014] The biomass carbonization and crushing equipment 1 here includes biomass carbonization equipment and crushing equipment. The biomass carbonization equipment is commercially available equipment, such as the technical solution of a high-efficiency, environmentally friendly and energy-saving biomass carbonization unit as described in CN201820974864.7. The crushing equipment is also existing equipment, such as a crusher.

[0015] Furthermore, the biomass carbonization and crushing equipment 1 is connected to the powder silo 2 via a conveyor belt 101.

[0016] Furthermore, a gate 3 is installed on the biomass carbon discharge pipe 102.

[0017] Furthermore, a shut-off valve 5 and a regulating valve 6 are installed on the primary air supply duct 104.

[0018] Furthermore, a quick-closing valve 7 and an adjustable orifice A 8 are provided on the biomass carbon conveying pipeline 105; and a quick-closing valve 10 and an adjustable orifice B 11 are provided on the coal powder outlet pipeline 106 of the coal mill.

[0019] The adjustable orifice A8 and adjustable orifice B11 have the same structure, being an orifice plate or valve structure with adjustable flow orifice diameter. They are mainly used in pulverized coal conveying pipeline systems (primary air ducts) in coal-fired power plants, metallurgy, and chemical industries. Their core function is to balance the pulverized coal flow and pressure between different conveying pipelines, ensuring stable and efficient boiler combustion. Structurally, adjustable orifice A8 and adjustable orifice B11 can be steel plates with one or more through holes. When it is a single-hole gate, the gate has only one circular or specifically shaped hole; moving the gate changes the flow area of ​​the pipeline. When it is a double-hole gate, the gate has two semi-circular holes (like the two wings of a butterfly). When the gate is in the middle position, the two semi-holes coincide with the pipeline, with the maximum opening; when the gate moves to one side, one semi-hole gradually closes the pipeline, while the other semi-hole completely moves out of the pipeline, achieving stepless adjustment of the opening.

[0020] The working principle and process of this utility model are as follows: After entering the plant, the biomass enters the biomass carbonization and crushing equipment 1. This equipment utilizes waste heat from boiler flue gas or steam as a heat source, and at 300-400℃, the biomass undergoes drying, pyrolysis, and carbonization to produce biomass carbon. The biomass carbon is then crushed to the particle size required for boiler combustion and stored in a separate powder silo 2 via conveyor belt 101. A regulating gate 3 directs the biomass carbon through the biomass carbon drop pipe 102 into the coal feeder 4. Adjusting the feed rate of the coal feeder 4 causes the biomass carbon powder to fall through the biomass carbon supply pipe 103. Open the shut-off valve 5 on the primary air duct, adjust the opening of the regulating valve 6, and open the quick-closing valve 7 to allow the primary air and biomass carbon powder to merge and be transported through the biomass carbon conveying pipe 105. The quick-closing valve 10 at the coal mill outlet of the coal mill 9 is normally open. Adjust the adjustable orifice A 8 and adjustable orifice B 11 to adjust the resistance and concentration of the biomass carbon powder and coal powder in the pipes. After the biomass carbon powder and coal powder are fully mixed in the coal powder mixer 12, they enter the boiler coal powder burner 14 for combustion. Biomass carbon has a high calorific value, which can increase the calorific value of the fuel entering the furnace when co-fired with raw coal. With proper air distribution, it helps to stabilize combustion in the furnace. Thus, the biomass raw material enters the plant and is transported together with the coal powder through the boiler tail flue gas heat or steam waste heat, completing the in-furnace co-firing.

[0021] This invention avoids the problems of biomass fuel crushing and blockage during transportation, achieving clean carbon reduction in coal-fired power units. This invention can be applied to newly built coal-fired power plants or to the co-firing retrofitting of existing units.

[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A boiler waste heat carbonization and biomass co-firing system, characterized in that: The equipment includes a biomass carbon production and crushing device (1), which has a biomass raw material feed inlet (15) at its inlet and a hot air inlet pipe (108) at its air inlet. The hot air inlet pipe (108) receives hot air from the flue gas or steam waste heat at the tail end of the boiler. A powder bin (2) is provided at the outlet of the biomass carbon production and crushing device (1). The powder outlet of the powder bin (2) is connected to a coal feeder (4) through a biomass carbon drop pipe (102). A biomass carbon supply pipe is provided at the outlet of the coal feeder (4). (103) Biomass carbon supply pipe (103) is connected to primary air supply pipe (104) and biomass carbon conveying pipe (105) respectively. Primary air supply pipe (104) is connected to primary air main pipe (13). The other end of biomass carbon conveying pipe (105) is connected to pulverized coal mixer (12). The outlet of pulverized coal mixer (12) is connected to boiler pulverized coal burner (14) through primary air inlet pipe (107). The other inlet of pulverized coal mixer (12) is connected to pulverized coal outlet pipe (106) of pulverized coal mill (9).

2. The boiler waste heat carbonization and biomass co-firing system according to claim 1, characterized in that: The biomass carbonization and crushing equipment (1) is connected to the powder silo (2) via a conveyor belt (101).

3. The boiler waste heat carbonization and biomass co-firing system according to claim 1, characterized in that: A gate (3) is installed on the biomass carbon discharge pipe (102).

4. The boiler waste heat carbonization and biomass co-firing system according to claim 1, characterized in that: A shut-off valve (5) and a regulating valve (6) are installed on the primary air supply duct (104).

5. The boiler waste heat carbonization and biomass co-firing system according to claim 1, characterized in that: A quick-closing valve (7) and an adjustable orifice A (8) are provided on the biomass carbon conveying pipeline (105); a quick-closing valve (10) and an adjustable orifice B (11) are provided on the coal powder outlet pipeline (106) of the coal mill.

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