Nozzle for activating pulverized coal and pulverized coal activating device

Abstract

The invention discloses a nozzle for pulverized coal activation and a pulverized coal activation device, and belongs to the technical field of low-load stable combustion of boilers. The problems that an existing stable combustion technology is complex in structure and high in operation cost are solved. The nozzle for activating the pulverized coal comprises a combustion-supporting air pipe, a primary air pipe and a secondary air pipe which are sequentially arranged from inside to outside, a burning torch, an oil gun and an oil flame detection device are inserted into the combustion-supporting air pipe, a combustion-supporting air channel is formed in the combustion-supporting air pipe, a primary air channel is formed between the combustion-supporting air pipe and the primary air pipe, and primary air carries the pulverized coal to enter the primary air channel; a secondary air channel is formed between the primary air pipe and the secondary air pipe, a coal fire detection device and a water spraying pipe are inserted into the final assembly flange, and an atomizing nozzle is arranged at the water outlet end of the water spraying pipe. The method is used for activating the pulverized coal.

Description

Technical Field

[0001] This invention relates to a nozzle and a coal powder activation device for pulverized coal activation, belonging to the field of boiler low-load stable combustion technology. Background Technology

[0002] Low-load stable combustion technology is one of the key technologies for peak shaving in power plants. Generally speaking, low-load stable combustion technology for boilers mainly consists of two levels. One is the fine-tuning of combustion during boiler operation, i.e., adjusting operating parameters to achieve stable combustion under low load. The other is modifying the structure of the boiler burner, i.e., adjusting the burner's structural parameters to achieve stable combustion under low load. Compared to structural modification, fine-tuning combustion is more flexible, and the technology of maintaining stable combustion through combustion assistance is more effective and has a higher peak shaving depth.

[0003] The principle of maintaining stable combustion through combustion assistance is to provide a certain amount of heat in some way to reduce the ignition heat of coal, gradually igniting the pulverized coal, and ultimately achieving stable combustion. Currently, the main technologies for maintaining stable combustion through combustion assistance include: oil-assisted combustion technology, micro-oil ignition technology, plasma ignition technology, co-firing combustible gases, and partial gasification of pulverized coal for stable combustion.

[0004] When starting up a pulverized coal boiler using oil-assisted combustion technology, both a starting oil gun and an ignition oil gun are used. The ignition oil gun is designed to ensure that the temperature required to ignite the pulverized coal is quickly reached in the initial stage of startup, thereby reducing startup time and improving the reliability of the startup process. The starting oil gun plays a crucial role in the process of the boiler from ignition to reaching a stable combustion state. It can provide a more persistent and stronger flame than the ignition oil gun to maintain the temperature inside the furnace until the pulverized coal combustion is sufficiently stable; however, this technology requires a continuous supply of fuel oil for stable combustion, resulting in higher operating costs. The theoretical basis of micro-oil ignition technology lies in its ability to generate a large amount of high-temperature heat source with a very small amount of oil, thereby providing the high-temperature environment required for ignition of pulverized coal; however, its operating cost is still relatively high, and it requires a high initial investment cost. Plasma ignition technology uses high-temperature plasma as an ignition source, which has a temperature significantly higher than that of traditional ignition technology. This allows for faster and more efficient ignition of pulverized coal. The high energy density of plasma indicates that it can ignite rapidly with minimal energy consumption, thereby improving energy utilization efficiency. However, the initial investment and operating costs of plasma ignition technology are relatively high. Co-firing with combustible gas refers to introducing combustible gases such as H2, which burn and release heat to ignite pulverized coal. However, this method requires additional input of combustible gas. If combustible gas is purchased directly, it will increase costs and require storage equipment, which will increase safety hazards. If combustible gas is obtained through a gasifier, the cost will be reduced. However, existing gasifiers are equipped with gas-solid separation devices, which are relatively complex. The coal powder partial gasification stable combustion is to control the temperature of the gasification furnace, so that the coal powder is partially gasified in the gasification furnace to generate high-temperature combustion gas rich in CO, and the high-temperature combustion gas carries the unburned coal powder into the boiler furnace to complete the stable combustion of the coal powder in the boiler; however, the existing coal powder partial gasification device is not flexible enough in adjusting the temperature in the furnace, and coking is prone to occur when the temperature is too high.

[0005] In summary, the existing stable combustion technology device structure is relatively complex, the initial investment cost is high, the operation cost is also relatively high, and for example, the method of mixing and burning combustible gas often needs to store the gas in an intermediate storage bin, which has a large safety hazard, and the temperature adjustment of the existing coal powder partial gasification device is not flexible enough, and coking is prone to occur.

[0006] The technology of activating coal powder to participate in stable combustion is the development trend of future low-load stable combustion technology, but the research on this technology is not mature enough, and the nozzle structure that can be used for coal powder activation is less seen, and the coal powder activation device is not flexible enough in controlling the activation reaction temperature, and coking is prone to occur, so there is an urgent need for a coal powder activation device and a coal powder activation device nozzle which are simple in structure and flexible in temperature control. SUMMARY

[0007] The present application is to solve the problem of the existing stable combustion technology that the structure is complex and the operation cost is high, and further provides a nozzle for coal powder activation and a coal powder activation device.

[0008] The technical scheme adopted by the present application to solve the above technical problems is: A nozzle for coal powder activation, comprising combustion-supporting air pipes, primary air pipes and secondary air pipes arranged in sequence from inside to outside, a spark gun, an oil gun and an oil and fire detection device are inserted and installed in the combustion-supporting air pipes, a combustion-supporting air passage is formed in the combustion-supporting air pipes, a primary air passage is formed between the combustion-supporting air pipes and the primary air pipes, the primary air carries the coal powder into the primary air passage, a secondary air passage is formed between the primary air pipes and the secondary air pipes, a combustion-supporting air inlet pipe is communicatively arranged at the upper part of the combustion-supporting air pipes, a primary air inlet pipe is communicatively arranged at the top of the primary air pipes, a secondary air inlet pipe is communicatively arranged at the upper part of the secondary air pipes, a total assembly flange is communicatively installed at the lower part of the secondary air pipes, a coal fire detection device and a water injection pipe are inserted and installed on the total assembly flange, and an atomizing nozzle is arranged at the water outlet end of the water injection pipe.

[0009] Further, the bottom end of the combustion-supporting air pipes is arranged higher than the bottom end of the primary air pipes, the bottom end of the oil gun is arranged higher than the bottom end of the combustion-supporting air pipes, and the lower part of the coal fire detection device and the lower part of the water injection pipe are respectively arranged obliquely towards the lower part of the nozzle.

[0010] Further, the primary air inlet pipe is a bent pipe, and an air outlet end of the primary air inlet pipe is communicated with the top end of the primary air pipe, the combustion-supporting air pipe passes through the primary air inlet pipe upwardly and extends to the outside of the primary air inlet pipe, and the primary air inlet pipe comprises a straight pipe section, a gradually expanding section and a bent pipe section communicated in sequence, wherein one end of the straight pipe section is an air inlet end, one end of the bent pipe section is an air outlet end and is fixedly connected with the top end of the primary air pipe, and the gradually expanding angle of the gradually expanding section ranges from 5 to 10 degrees.

[0011] Further, the bent pipe section is internally fixedly provided with a flow guide plate.

[0012] Further, the inner wall of the bent pipe section and the inner wall of the flow guide plate are both provided with a ceramic lining layer.

[0013] Further, the middle part of the secondary air pipe is in a gradually narrowing structure from top to bottom, and a plurality of rotational flow vanes are arranged in the gradually narrowing structure along the circumferential direction.

[0014] Further, the middle part of the combustion-supporting air pipe is provided with a first gradually narrowing section, the middle part of the primary air pipe is provided with a second gradually narrowing section, and the first gradually narrowing section and the second gradually narrowing section are arranged in radial correspondence.

[0015] Further, the primary air channel and the secondary air channel are coaxially arranged.

[0016] A pulverized coal activation device comprises an activation device body and the above-mentioned coal powder activation nozzle, the nozzle is fixedly connected with the top end of the activation device body, the bottom of the activation device body is provided with an activation product outlet, and the combustion-supporting air channel, the primary air channel, the secondary air channel, the ignition gun, the oil fire detection device, the oil gun, the coal fire detection device and the water spraying pipe are all communicated with an internal activation reaction zone of the activation device body.

[0017] Further, the upper part of the activation device body is in a cylindrical structure, the lower part is in a conical cylindrical structure, and the inner wall surface of the activation device body is paved with a refractory material layer.

[0018] Compared with the prior art, the present application has the following effects: The present application provides a new coal powder activation nozzle, and the primary air carrying the pulverized coal enters the primary air channel, and compared with the existing nozzle which needs to be separated according to the thickness, the wind coal mixing effect is better.

[0019] The primary air channel and the secondary air channel are arranged in a ring shape from the inside to the outside, so that the structure is more compact, the wind coal mixing in the subsequent activation process is more uniform, and the activation effect is better.

[0020] By arranging the primary air inlet pipe, the secondary air inlet pipe and the combustion-supporting air inlet pipe, the primary air, the secondary air and the combustion-supporting air can enter conveniently.

[0021] Compared with the existing oil gun combustion, gas (for example, hydrogen) combustion or plasma combustion, the coal powder activation and combustion supporting mode of the nozzle of the present application does not need to continuously pour oil, gas or use electricity, and only needs to pour oil once at ignition, greatly reducing the initial investment and operation cost.

[0022] The nozzle of the present application has simple structure, and realizes the wind coal mixing, coal powder pre-combustion and oil pre-combustion through the sequentially arranged combustion supporting air pipe, primary air pipe and secondary air pipe from inside to outside, and the ignition gun, oil gun and oil fire detection device inserted in the combustion supporting air pipe.

[0023] By setting the water spraying pipe, the atomized water is introduced into the activation reaction zone inside the activation device main body, and then the temperature of the activation reaction zone is reduced. Compared with the prior art, it does not need to set a water-cooled wall for cooling, and the temperature regulation is more flexible, which can be suitable for different wind coal ratios. The flexible temperature regulation can ensure the smooth progress of the activation reaction and effectively prevent coking.

[0024] The combustion supporting air pipe, ignition gun, oil gun and oil fire detection device form a micro-oil ignition device for igniting the coal powder.

[0025] The coal powder activation device of the present application activates the coal powder, and the formed coal powder activation product is used as a combustion supporting fuel to realize low load stable combustion. The material is easy to obtain, and the operation cost is lower.

[0026] By using the coal powder activation device of the present application, the gas-solid separation device is no longer needed. After the activation product comes out of the activation device, it can directly realize low load stable combustion in the boiler burner, without the need for an intermediate storage bin. The structure is simpler, the energy loss is smaller, and the safety is higher. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the coal powder activation nozzle; Figure 2 It is a schematic diagram of the main cross-sectional view of the coal powder activation nozzle; Figure 3 It is a schematic diagram of the three-dimensional cross-sectional view of the primary air inlet pipe; Figure 4 It is a schematic diagram of the three-dimensional cross-sectional view of the primary air pipe; Figure 5 It is a schematic diagram of the three-dimensional cross-sectional view of the secondary air pipe; Figure 6 It is a schematic diagram of the three-dimensional structure of the coal powder activation device; Figure 7 It is a schematic diagram of the main cross-sectional view of the coal powder activation device.

[0028] In the figure: 1, combustion air pipe; 101, first tapered section; 2, primary air pipe; 201, second tapered section; 3, secondary air pipe; 301, large-diameter cylindrical section; 302, transition conical section; 303, small-diameter cylindrical section; 4, ignition lance; 5, oil lance; 6, oil fire detection device; 7, combustion air inlet pipe; 8, primary air inlet pipe; 801, straight pipe section; 802, diverging section; 803, elbow pipe section; 804, deflector; 9, secondary air inlet pipe; 10, first mounting flange; 11, second mounting flange; 12, swirl vane; 13, activation device main body; 131, activation product outlet; 14, nozzle; 15, coal fire detection device; 16, water injection pipe; 17, general assembly flange. DETAILED DESCRIPTION

[0029] DETAILED DESCRIPTION Figures 1-7 The technical solutions in the embodiments of the present application are described clearly and completely, obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments, based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0030] A nozzle for activating coal powder comprises, from inside to outside, a combustion air pipe 1, a primary air pipe 2, and a secondary air pipe 3. The combustion air pipe 1 is internally inserted with an ignition lance 4, an oil lance 5, and an oil fire detection device 6. A combustion air passage is formed inside the combustion air pipe 1. A primary air passage is formed between the combustion air pipe 1 and the primary air pipe 2. Primary air carrying coal powder enters the primary air passage. A secondary air passage is formed between the primary air pipe 2 and the secondary air pipe 3. A combustion air inlet pipe 7 is communicatively arranged on the upper part of the combustion air pipe 1. A primary air inlet pipe 8 is communicatively arranged on the top of the primary air pipe 2. A secondary air inlet pipe 9 is communicatively arranged on the upper part of the secondary air pipe 3. A general assembly flange 17 is communicatively arranged on the lower part of the secondary air pipe 3. A coal fire detection device 15 and a water injection pipe 16 are inserted on the general assembly flange 17. An atomizing nozzle is arranged at the water outlet end of the water injection pipe 16.

[0031] The present application provides a new nozzle for activating coal powder. Compared with the existing nozzle that needs to separate the thick and thin, the wind-coal mixing effect is better.

[0032] The primary air passage and the secondary air passage are arranged in a ring shape from inside to outside, which makes the structure more compact and the wind-coal mixing more uniform in the subsequent activation process, and the activation effect is better.

[0033] The primary air inlet pipe 8, the secondary air inlet pipe 9, and the combustion air inlet pipe 7 are arranged to facilitate the entry of primary air, secondary air, and combustion air.

[0034] Compared with existing methods such as oil gun combustion, gas (e.g., hydrogen) combustion, or plasma combustion, the method of using the nozzle of the present invention to activate pulverized coal for combustion does not require continuous oil, gas, or electricity supply. It only requires oil to be added once during ignition, which greatly reduces the initial investment and operating costs.

[0035] The nozzle structure of the present invention is simple. It achieves air-coal mixing, coal powder pre-combustion and oil pre-combustion through the combustion-supporting air pipe 1, primary air pipe 2 and secondary air pipe 3 arranged sequentially from the inside to the outside, as well as the ignition gun 4, oil gun 5 and oil flame detection device 6 inserted in the combustion-supporting air pipe 1.

[0036] The combustion-supporting air duct 1, ignition gun 4, oil gun 5, and oil flame detection device 6 together form a micro-oil ignition device, which is used to ignite pulverized coal.

[0037] By setting up a water spray pipe 16, water is sprayed into the activation reaction zone inside the activation device body 13, thereby cooling the activation reaction zone. Compared with the existing technology, there is no need to set up a water-cooled wall for cooling, and the temperature adjustment is more flexible. It can be applied to different air-coal ratios. The flexible temperature control can ensure the smooth progress of the activation reaction and effectively prevent coking.

[0038] The ratio of the length of the oil pre-combustion section to the inner diameter of the combustion air duct 1 is preferably 3 to 4.5. The ratio of the length of the coal pre-combustion section to the inner diameter of the secondary air duct 3 is 0.5 to 0.7 to avoid excessively high temperature in the primary air duct, which could damage the nozzle.

[0039] Oil gun 5 is used for spraying oil, ignition gun 4 is used for igniting the oil after spraying, and oil flame detector 6 is used to determine whether the oil has ignited. Coal flame detector 15 is used to determine whether the pulverized coal has ignited.

[0040] The water spray pipe 16 can also be a steam pipe, that is, water vapor can be sprayed directly into the main body 13 of the activation device for cooling. The oil gun 5, ignition gun 4, oil flame detection device 6 and atomizing nozzle at the water outlet of the water spray pipe are all existing technologies, and their specific structural components will not be described in detail here.

[0041] The temperature of the primary air is 40℃-100℃, and the air-to-coal ratio is 1.2-1.7; Secondary air enters the secondary air duct, and the temperature of the secondary air is 300℃-360℃. Combustion-supporting air enters the combustion-supporting air duct; the temperature of the combustion-supporting air is ambient, and the flow rate is 250 Nm³. 3 / h -750Nm3 / h.

[0042] The top end of the combustion-supporting air pipe 1 is sealingly provided with a first mounting flange 10, the ignition gun 4, the oil gun 5 and the oil fire detection device 6 are fixedly and penetratingly arranged on the first mounting flange 10, and the primary air inlet pipe 8 is fixedly connected with the primary air pipe 2 through a second mounting flange 11. By arranging the first mounting flange 10, installation conditions are provided for the ignition gun 4, the oil gun 5 and the oil fire detection device 6, thereby facilitating the installation and dismounting of the ignition gun 4, the oil gun 5 and the oil fire detection device 6. By arranging the second mounting flange 11, the installation and dismounting of the primary air inlet pipe 8 are facilitated.

[0043] The bottom end of the combustion-supporting air pipe 1 is arranged higher than the bottom end of the primary air pipe 2, the bottom end of the oil gun 5 is arranged higher than the bottom end of the combustion-supporting air pipe 1, and the lower part of the coal fire detection device 15 and the lower part of the water spraying pipe 16 are respectively arranged to be inclined towards the nozzle. In this way, the space between the bottom end of the oil gun 5 and the bottom end of the combustion-supporting air pipe 1 is an oil pre-combustion section, which plays a role of pre-combusting oil. By arranging the bottom end of the combustion-supporting air pipe 1 to be higher than the bottom end of the primary air pipe 2, the lower part of the combustion-supporting air passage is provided with a coal powder pre-combustion section in the primary air passage, which plays a role of pre-combusting coal powder. By arranging the oil pre-combustion section and the coal powder pre-combustion section, the coal powder is more easily ignited, and the activation effect is further improved. The inclined insertion of the coal fire detection device 15 can make it identify the flame in the center position of the inside of the activation device main body 13 as much as possible. Because the temperature inside the activation device main body 13 is relatively high, the inclined insertion of the water spraying pipe 16 can avoid the water from being directly sprayed to the inner wall or the bottom wall of the activation device main body 13.

[0044] The primary air inlet pipe 8 is a bent pipe, the air outlet end of which is in communication with the top end of the primary air pipe 2, the combustion-supporting air pipe 1 passes through the primary air inlet pipe 8 upwards and extends to the outside of the primary air inlet pipe 8, and the primary air inlet pipe 8 comprises a straight pipe section 801, a gradually expanding section 802 and a bent pipe section 803 which are in communication in sequence, wherein one end of the straight pipe section 801 is an air inlet end, one end of the bent pipe section 803 is an air outlet end and is fixedly connected with the top end of the primary air pipe 2, and the gradually expanding angle of the gradually expanding section 802 ranges from 5° to 10°. In this way, the primary air inlet pipe 8 adopts a bent pipe structure, which facilitates the smooth entry of the primary air and the coal powder into the primary air passage. The combustion-supporting air inlet pipe 7 is obliquely inserted into the upper side wall of the combustion-supporting air pipe 1 from top to bottom, so that the combustion-supporting air can more smoothly enter the combustion-supporting inner passage. The gradually expanding angle is the cone angle of the virtual cone in which the gradually expanding section 802 is located. By arranging the gradually expanding section 802, the primary air inlet pipe 8 is formed with an expanding opening, which can ensure the coal powder inlet speed while taking into account the bent pipe structure, and the speed in the coal powder conveying pipeline is usually 22-28 m / s.

[0045] The guide vane 804 is arranged along the bending direction of the elbow section 803, and the elbow interior space is divided into two parts by the guide vane 804, so that the coal powder is more evenly distributed in the primary air channel.

[0046] The inner wall of the elbow section 803 and the inner wall of the guide vane 804 are both provided with a ceramic lining layer, which effectively reduces the abrasion of the primary air pipe 2 and prolongs the service life of the primary air pipe 2.

[0047] The middle part of the secondary air pipe 3 is tapered from top to bottom, and a plurality of swirl vanes 12 are arranged in the tapered structure in the circumferential direction. Compared with combustion, the activation reaction requires less secondary air, and in order to ensure the mixing effect, the outlet flow velocity of the secondary air needs to be increased to increase the momentum of the secondary air. Through the tapered structure, the flow velocity at the secondary air outlet is effectively increased while ensuring sufficient diffusion of the secondary air flow. Specifically, the secondary air pipe 3 includes a large-diameter cylindrical section 301, a transition conical section 302 and a small-diameter cylindrical section 303 arranged in sequence from top to bottom. The large-diameter cylindrical section 301 facilitates the introduction of secondary air, the transition conical section 302 can increase the flow velocity of the secondary air, and the small-diameter cylindrical section 303 facilitates the installation of the activation device main body 13. The swirl vanes 12 are distributed in the transition conical section 302. Since the secondary air for activation reaction is less, a higher swirl number is required to ensure the mixing effect. If the swirl number is too low, the mixing effect is not good, but if the swirl number is too high, the mixing improvement is not much, but it will affect the stability of the activation reaction. In the present application, the height of the swirl vane 12 changes with the height of the transition conical section 302, the angle of the swirl vane 12 is 35°~55°, and the swirl number is 0.7~1.2. The ratio of the depth of the concave part of the swirl vane 12 to the diameter of the secondary air channel is 0~0.2. In order to expand the backflow area and improve stability, the concave depth can be appropriately increased, but the depth is too large, the benefit is small, and the pressure drop and instability increase significantly.

[0048] The middle part of the combustion air pipe 1 is provided with a first tapered section 101, and the middle part of the primary air pipe 2 is provided with a second tapered section 201, and the first tapered section 101 and the second tapered section 201 are arranged in radial correspondence. Such design further ensures the stability of the coal powder flow rate in the primary air channel. The taper angle is preferably 5°~10°.

[0049] The primary air channel and the secondary air channel are coaxially arranged, so that the primary air is straight flow air, the secondary air is rotational flow air, and the secondary air plays a role in organizing the flow field, and the coaxial arrangement of the primary air channel and the secondary air channel has a better effect on the organization of the flow field.

[0050] A pulverized coal activation device comprises an activation device body 13 and a pulverized coal activation nozzle 14, the nozzle 14 is communicated with the top end of the activation device body 13, the bottom of the activation device body 13 is provided with an activation product outlet 131, a combustion-supporting air channel, a primary air channel, a secondary air channel, an ignition gun 4, an oil fire detection device 6, an oil gun 5, a coal fire detection device 15 and a water spraying pipe 16 are all communicated with an activation reaction zone in the activation device body 13.

[0051] The flow rate of the primary air entering the activation reaction zone in the activation device body 13 is 15-25 m / s.

[0052] The flow rate of the secondary air entering the activation reaction zone in the activation device body 13 is 25-45 m / s.

[0053] The temperature of the activation product outlet 131 of the activation device body 13 is controlled at 750-950 DEG C, the operating pressure is -50-1500 Pa, the total air-coal ratio (the mass ratio of air and pulverized coal) is 1.7-2.4, and the residence time of gas and solid is 0.1-22 s.

[0054] The bottom of the nozzle 14 and the activation device body 13 are fixedly connected through a general assembly flange 17, the general assembly flange 17 is arranged to facilitate the installation and disassembly of the nozzle 14 and the activation device body 13.

[0055] The pulverized coal activation device of the application uses the activation product of the pulverized coal as the combustion-supporting fuel to realize low-load stable combustion, is convenient to obtain materials and has lower operation cost.

[0056] By using the pulverized coal activation device, a gas-solid separation device is not needed, the activation product can be directly combusted in a boiler burner after being discharged from the activation device, an intermediate storage bin is not needed, the structure is simpler, the energy loss is smaller, and the safety is higher.

[0057] The upper part of the activation device body 13 is in a cylindrical structure, the lower part is in a conical cylindrical structure, and the inner wall of the activation device body 13 is paved with a refractory material layer. In this way, through the conical cylindrical structure of the lower part of the activation device body 13, the direct impact of the coal powder on the bottom of the activation device body 13 is effectively avoided, the resistance of the coal powder moving to the activation product outlet 131 is reduced, the coal powder discharge speed is improved, and further coking is reduced. The lower part of the activation device body 13 includes a conical cylinder section and a straight cylinder section, wherein the large-diameter end of the conical cylinder section is in communication and fixed connection with the upper part of the activation device body 13 in a cylindrical structure, the small-diameter end of the conical cylinder section is in communication and fixed connection with one end of the straight cylinder section, and the other end of the straight cylinder section is the activation product outlet 131. By arranging the straight cylinder section below the conical cylinder section, it is convenient to install flange plates and other structures, and then it is convenient to connect with the boiler equipment.

[0058] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes within the technical range disclosed in the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A nozzle for pulverized coal activation, characterized in that: The system includes a combustion air duct (1), a primary air duct (2), and a secondary air duct (3) arranged sequentially from the inside to the outside. An ignition gun (4), an oil gun (5), and an oil flame detection device (6) are installed inside the combustion air duct (1). A combustion air channel is formed inside the combustion air duct (1). A primary air channel is formed between the combustion air duct (1) and the primary air duct (2). The primary air carries coal powder into the primary air channel. A secondary air channel is formed between the primary air duct (2) and the secondary air duct (3). A combustion air inlet pipe (7) is connected to the upper part of the combustion air duct (1). A primary air inlet pipe (8) is connected to the top of the primary air duct (2). A secondary air inlet pipe (9) is connected to the upper part of the secondary air duct (3). A general assembly flange (17) is installed at the lower part of the secondary air duct (3). A coal flame detection device (15) and a water spray pipe (16) are installed on the general assembly flange (17). An atomizing nozzle is provided at the water outlet end of the water spray pipe (16).

2. The nozzle for pulverized coal activation according to claim 1, characterized in that: The bottom end of the combustion air duct (1) is set higher than the bottom end of the primary air duct (2), the bottom end of the oil gun (5) is set higher than the bottom end of the combustion air duct (1), and the lower part of the coal fire detection device (15) and the lower part of the water spray pipe (16) are respectively arranged inclined towards the nozzle.

3. The nozzle for pulverized coal activation according to claim 1, characterized in that: The primary air inlet pipe (8) is a bend, and its outlet end is connected to and fixed at the top of the primary air pipe (2). The combustion air pipe (1) passes upward through the primary air inlet pipe (8) and extends to the outside of the primary air inlet pipe (8). The primary air inlet pipe (8) includes a straight pipe section (801), a gradually expanding section (802), and a bend section (803) connected in sequence. One end of the straight pipe section (801) is the air inlet end, and one end of the bend section (803) is the air outlet end and is connected to and fixed at the top of the primary air pipe (2). The gradually expanding angle of the gradually expanding section (802) is in the range of 5°~10°.

4. A nozzle for pulverized coal activation according to claim 3, characterized in that: A guide plate (804) is fixed inside the bend section (803).

5. A nozzle for pulverized coal activation according to claim 4, characterized in that: The inner wall of the bend section (803) and the inner wall of the guide plate (804) are both provided with ceramic lining.

6. A nozzle for pulverized coal activation according to claim 1, characterized in that: The middle part of the secondary air duct (3) has a gradually narrowing structure from top to bottom, and several swirl blades (12) are arranged along its circumference inside the gradually narrowing structure.

7. A nozzle for pulverized coal activation according to claim 1, characterized in that: The combustion air duct (1) has a first tapering section (101) in the middle and the primary air duct (2) has a second tapering section (201) in the middle, and the first tapering section (101) and the second tapering section (201) are radially corresponding.

8. A nozzle for pulverized coal activation according to claim 1, characterized in that: The primary air duct and the secondary air duct are arranged coaxially.

9. A coal powder activation device, characterized in that: The device includes an activation device body (13) and a pulverized coal activation nozzle (14) as described in any one of claims 1 to 8. The nozzle (14) is connected and fixed at the top of the activation device body (13). An activation product outlet (131) is provided at the bottom of the activation device body (13). The combustion air channel, primary air channel, secondary air channel, ignition gun (4), oil flame detection device (6), oil gun (5), coal flame detection device (15) and water spray pipe (16) are all connected to the activation reaction zone inside the activation device body (13).

10. A pulverized coal activation device according to claim 9, characterized in that: The upper part of the activation device body (13) is cylindrical and the lower part is conical. The inner wall of the activation device body (13) is covered with a refractory material layer.

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