Gasification fine slag combustion test device and test method

Abstract

The invention discloses a gasification fine slag combustion test device and method, the test device comprises a preheating combustor, a heat insulation combustor and a heat exchanger, the preheating combustor comprises a body, a first pipeline and a second pipeline, the body is provided with a combustion chamber, a fine slag channel is formed in the first pipeline, the second pipeline sleeves the outer side of the first pipeline, and the heat insulation combustor is arranged in the combustion chamber. A preheating fine slag channel is formed between the second pipeline and the first pipeline, a secondary air channel is formed between the second pipeline and the body, the heat insulation combustor is connected with the body and provided with a combustion chamber, the combustion chamber is communicated with the combustion cavity, the first pipeline is communicated with the combustion chamber, the heat exchanger is connected with the heat insulation combustor, and smoke in the heat insulation combustor can enter the heat exchanger. Flue gas passing through the heat exchanger can be introduced into the heat insulation combustor and the preheating fine slag channel, and part of secondary air can enter the secondary air channel and the fine slag channel after being subjected to heat exchange through the heat exchanger. According to the gasification fine slag combustion test device, the fine slag fuel combustion efficiency is high, and combustion is sufficient.

Description

Technical Field

[0001] This invention relates to the field of gasification fine slag combustion technology, specifically to a gasification fine slag combustion test apparatus and test method. Background Technology

[0002] Gasifiers are widely used equipment in the coal chemical industry, mainly divided into circulating fluidized bed gasifiers and entrained flow gasifiers. Circulating fluidized bed gasifiers use dry dust removal, producing gasified fine slag with extremely low moisture content, which can be used to prepare activated carbon or as combustion and gasification fuel. Entrained flow gasifiers produce coarse and fine slag. The coarse slag has a theoretically low carbon content, only 10%~20%, and can be used as a blending material for road construction materials or for backfilling. The fine slag has a higher carbon content, generally between 20% and 40%, with a well-developed pore structure, strong hydrophilicity, water content >50%, and free radical moisture accounting for 80%. High residual carbon content restricts the utilization of fine slag in construction and building materials, while high ash content affects its combustion efficiency as a carbon-based fuel. Furthermore, when fine slag is incinerated, it has a high ignition point, incomplete volatilization, small particle size, short residence time in combustion equipment, and is difficult to burn completely. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of the present invention provide a gasification fine slag combustion test apparatus and test method.

[0004] The gasification fine slag combustion test apparatus of this invention includes: A preheating burner includes a body, a first pipe, and a second pipe. The body has a combustion chamber. The first pipe is disposed in the combustion chamber and extends along a first direction. A fine slag channel is formed inside the first pipe. The second pipe is sleeved on the outside of the first pipe. A preheating fine slag channel is formed between the inner wall of the second pipe and the outer wall of the first pipe. A secondary air channel is formed between the outer wall of the second pipe and the inner wall of the body. An insulated burner is connected to the main body, the insulated burner has a combustion chamber, the combustion chamber is connected to the combustion cavity, and one end of the first pipe adjacent to the insulated burner is connected to the combustion chamber; A heat exchanger is connected to the adiabatic burner. Flue gas in the adiabatic burner can enter the heat exchanger. Flue gas passing through the heat exchanger can enter the adiabatic burner and the preheating fine slag channel. Part of the secondary air can enter the secondary air channel and the fine slag channel after heat exchange through the heat exchanger.

[0005] In the gasification fine slag combustion test apparatus of this invention, fine slag fuel enters the combustion chamber through a preheated fine slag channel for combustion. The temperature inside the combustion chamber rises, and the fine slag fuel burns stably within the combustion chamber. The flame inside the combustion chamber enters the combustion chamber, further raising the temperature inside the combustion chamber. Fine slag fuel is then introduced into the combustion chamber through the fine slag channel to facilitate combustion within the combustion chamber, extending the combustion time of the fine slag fuel in the combustion test apparatus and ensuring complete combustion. Furthermore, the flue gas passing through the heat exchanger enters the preheated fine slag channel to preheat the fine slag fuel, making it easier to burn. The flue gas passing through the heat exchanger enters the adiabatic combustion chamber, cooling the walls of the adiabatic combustion chamber and preventing coking. The secondary air temperature rises after passing through the heat exchanger, further improving the combustion efficiency of the fine slag fuel.

[0006] In some embodiments, the preheating burner further includes: A reflux cap is provided on the bottom surface of the combustion chamber adjacent to the insulated burner. The reflux cap has a groove on the side opposite to the insulated burner. The groove is arc-shaped. One end of the first pipe passes through the groove and communicates with the burner. One end of the second pipe extends into the groove. A cyclone separator is provided at the end of the secondary air duct away from the insulated burner and is arranged in a ring around the outer periphery of the second pipe. An igniter is located at the end of the secondary air duct away from the insulated burner to achieve the ignition function.

[0007] In some embodiments, the central axis of the first pipe, the central axis of the second pipe, and the central axis of the body are collinear.

[0008] In some embodiments, the cross-sectional area of ​​the body gradually increases along the first direction from one end of the body away from the adiabatic burner to one end of the body adjacent to the adiabatic burner.

[0009] In some embodiments, the cross-sectional area of ​​the combustion chamber is greater than the maximum cross-sectional area of ​​the combustion cavity.

[0010] In some embodiments, the adiabatic burner further has a first flue gas inlet, which is located on the end face of the adiabatic burner adjacent to the heat exchanger. The first flue gas inlet is adjacent to the side wall of the adiabatic burner and communicates with the combustion chamber. Part of the flue gas discharged from the heat exchanger can enter the combustion chamber through the first flue gas inlet.

[0011] In some embodiments, there are multiple first flue gas inlets, and the multiple first flue gas inlets are arranged at circumferential intervals along the adiabatic burner.

[0012] In some embodiments, the adiabatic burner further has a second flue gas inlet, which is located on the side wall of the adiabatic burner and communicates with the combustion chamber. There are multiple second flue gas inlets, which are arranged at intervals along the circumference of the adiabatic burner. Part of the flue gas discharged from the heat exchanger can enter the combustion chamber through the second flue gas inlet.

[0013] In some embodiments, the flow direction of the flue gas entering the combustion chamber through the first flue gas inlet and the second flue gas inlet is opposite to the direction of the airflow entering the combustion chamber from the combustion chamber.

[0014] The gasification fine slag combustion test method of this invention includes: Turn on the igniter and introduce primary air and fine slag fuel into the combustion chamber through the preheating fine slag channel, and introduce secondary air into the secondary air channel. The igniter then ignites the secondary air, primary air, and fine slag fuel. The flame in the combustion chamber enters the combustion chamber, and preheated secondary air is introduced into the fine slag channel to enter the combustion chamber. The flame continues to burn in the combustion chamber, and the temperature in the combustion chamber rises. A mixture of fine slag fuel and conveying air is introduced into the fine slag channel to enter the combustion chamber, where the fine slag fuel and secondary air are burned.

[0015] The gasification fine slag combustion test method of this invention has a long residence time of fine slag fuel in the combustion chamber and combustion room, a high burnout rate, and the equipment is safe and reliable and can be operated for a long time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the gasification fine slag combustion test device according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the preheating stage of the gasification fine slag combustion test device according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the stable combustion stage of the gasification fine slag combustion test device according to an embodiment of the present invention.

[0019] Reference numerals: 1. Preheating burner; 11. Body; 111. Combustion chamber; 12. First pipe; 121. Fine slag channel; 13. Second pipe; 141. Preheating fine slag channel; 151. Secondary air channel; 16. Return cap; 161. Groove; 17. Swirl; 18. Ignition device; 2. Insulated burner; 21. Combustion chamber; 22. First flue gas inlet; 23. Second flue gas inlet; 3. Heat exchanger. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figures 1-3 As shown, the gasification fine slag combustion test device of this embodiment includes a preheating burner 1, an adiabatic burner 2, and a heat exchanger 3. The preheating burner 1, the adiabatic burner 2, and the heat exchanger 3 are arranged sequentially along a first direction. The preheating burner 1 includes a body 11, a first pipe 12, and a second pipe 13. The body 11 has a combustion chamber 111. The first pipe 12 is disposed in the combustion chamber 111 and extends along the first direction. A fine slag channel 121 is formed inside the first pipe 12. The second pipe 13 is sleeved on the outside of the first pipe 12. A preheating fine slag channel 141 is formed between the inner wall surface of the second pipe 13 and the outer wall surface of the first pipe 12. A secondary air channel 151 is formed between the outer wall surface of the second pipe 13 and the inner wall surface of the body 11.

[0022] The adiabatic burner 2 is connected to the main body 11. The adiabatic burner 2 has a combustion chamber 21, which is connected to the combustion cavity 111. One end of the first pipe 12 adjacent to the adiabatic burner 2 is connected to the combustion chamber 21. The heat exchanger 3 is connected to the adiabatic burner 2. The flue gas in the adiabatic burner 2 can enter the heat exchanger 3. The flue gas passing through the heat exchanger 3 can enter the adiabatic burner 2 and the preheating fine slag channel 141. Some of the secondary air can enter the secondary air channel 151 and the fine slag channel 121 after heat exchange through the heat exchanger 3.

[0023] In the gasification fine slag combustion test apparatus of this invention, fine slag fuel enters the combustion chamber 111 through the preheating fine slag channel 141 for combustion. The temperature in the combustion chamber 111 rises and the fine slag fuel burns stably within the combustion chamber 111. The flame in the combustion chamber 111 enters the combustion chamber 21, further raising the temperature within the combustion chamber 21. Fine slag fuel is then introduced into the combustion chamber 21 through the fine slag channel 121 to facilitate combustion within the combustion chamber 21, extending the combustion time of the fine slag fuel in the combustion test apparatus and ensuring complete combustion. Furthermore, the flue gas passing through the heat exchanger 3 enters the preheating fine slag channel 141 to preheat the fine slag fuel, making it easier to burn. The flue gas passing through the heat exchanger 3 enters the adiabatic combustion chamber 21, cooling the walls of the adiabatic combustion chamber 21 and preventing coking. The secondary air temperature rises after passing through the heat exchanger 3, further improving the combustion efficiency of the fine slag fuel.

[0024] Specifically, the secondary air in the secondary air duct 151 has two sources: one is secondary air whose temperature rises after heat exchange with heat exchanger 3, and the other is secondary air at room temperature that does not pass through heat exchanger 3.

[0025] Specifically, the preheating fine slag channel 141 can be switched to allow the introduction of a mixture of fine slag fuel and conveying air, or to allow the introduction of flue gas discharged through the heat exchanger 3. The fine slag channel 121 can be switched to allow the introduction of a mixture of fine slag fuel and conveying air, or to allow the introduction of secondary air.

[0026] Specifically, the wall surface of the insulated burner 2 is treated to reduce the heat transfer coefficient and minimize heat exchange between the insulated burner 2 and the outside environment. For example, refractory mud is applied to the inner surface of the combustion chamber 21, and insulation cotton or materials with a low heat transfer coefficient are wrapped around the outer wall surface of the insulated burner 2.

[0027] Specifically, the flue gas in the adiabatic burner 2 is introduced into the heat exchanger 3. The high-temperature flue gas can indirectly absorb heat from the walls of the heat exchanger 3 through media such as water, heat transfer oil, and steam, or it can be directly utilized after being conditioned to a suitable temperature by gases such as low-temperature air. One of the secondary air channels required in the preheating burner 1 is preheated to below 150 ℃ after exchanging heat with the heat exchanger 3 before entering the secondary air channel 151.

[0028] The flue gas drawn from the rear of heat exchanger 3 is also divided into two paths: one path can be introduced into the insulated burner 2, and the other path can be introduced into the preheating fine slag channel 141.

[0029] In some embodiments, the preheating burner 1 further includes a return cap 16, a swirler 17, and an igniter 18. The return cap 16 is located on the bottom surface of the combustion chamber 111 adjacent to the bottom surface of the adiabatic burner 2. The side of the return cap 16 away from the adiabatic burner 2 has a groove 161, which is arc-shaped. One end of the first pipe 12 passes through the groove 161 and communicates with the burner, and one end of the second pipe 13 extends into the groove 161. The swirler 17 is located at the end of the secondary air passage 151 away from the adiabatic burner 2 and is arranged in a ring around the outer periphery of the second pipe 13. The igniter 18 is located at the end of the secondary air passage 151 away from the adiabatic burner 2 to perform the ignition function.

[0030] Specifically, the end of the return cap 16 away from the adiabatic burner 2 is located to the right of the centerline of the combustion chamber 111, so as to ensure that the fine slag fuel is returned to the combustion space in the combustion chamber 111 after being returned by the return cap 16.

[0031] Specifically, the igniter 18 is turned on to form an ignition flame. The fine slag fuel introduced into the preheated fine slag channel 141 collides with the bottom surface of the groove 161 and turns 180° to flow back along the outer wall of the second pipe 13. It can convect with the secondary air introduced into the secondary air channel 151. The secondary air enters the secondary air channel 151 through the cyclone separator 17. The secondary air rotates in the secondary air channel 151. The atomized ignition oil sprayed by the igniter 18, along with the rotating secondary air, primary air and fine slag fuel, burn together, forming a stable reflux zone A in the combustion chamber 111. The fine slag fuel in the reflux zone A ignites to form an ignition flame.

[0032] It is understandable that continuous ignition and combustion can be achieved within the preheating burner 1, primarily due to the following reasons: (1) The secondary air that provides air for the ignition flame is preheated to no more than 150 °C by the heat exchanger 3. This prevents the flame temperature inside the preheater 1 from being too high, producing NOx or even coking, and also reduces the heating surface of the industrial equipment, making the system simpler.

[0033] (2) The solid-to-gas ratio of the fine slag in the preheating fine slag channel 141 is high, reaching 1.5~3.0 kg / kg, which can provide a high-concentration fuel supply for the ignition flame.

[0034] (3) The ignition flame has a high temperature of 1100~1200 ℃, which can preheat the fine slag fuel in the fine slag channel 141 through the wall surface of the fine slag channel 141.

[0035] (4) The preheated secondary air introduced into the fine slag channel 121 can also preheat the fine slag fuel in the preheating fine slag channel 141 through the wall of the fine slag channel 121.

[0036] (5) The stable reflux zone formed by the swirling secondary air and the fine slag airflow injected from the reflux cap 16 increases the contact area between the fine slag fuel and the secondary air, and prolongs the combustion time of the fine slag fuel.

[0037] In some embodiments, the central axis of the first pipe 12 and the central axis of the second pipe 13 are collinear with the central axis of the body 11, which increases the contact area between the fine slag fuel entering the combustion chamber 111 through the preheated fine slag channel 141 and the secondary air entering the combustion chamber 111 through the secondary air pipe, thereby improving the combustion efficiency of the fine slag fuel.

[0038] In some embodiments, the cross-sectional area of ​​the body 11 gradually increases along a first direction from the end of the body 11 away from the adiabatic burner 2 to the end of the body 11 adjacent to the adiabatic burner 2.

[0039] Specifically, the body 11 is generally frustum-shaped. The cross-sectional area of ​​the end of the body 11 away from the adiabatic burner 2 is smaller than the cross-sectional area of ​​the end of the body 11 adjacent to the adiabatic burner 2. The swirler 17 and the igniter 18 are both located at the end of the body 11 away from the adiabatic burner 2, and the return cap 16 is located at the end of the body 11 adjacent to the adiabatic burner 2. As described above, the combustion air in the combustion chamber 111 for the fine slag fuel can be guaranteed, and the combustion efficiency of the fine slag fuel in the combustion chamber 111 can be guaranteed.

[0040] Specifically, when the main body 11 is manufactured, the diameter of the end of the combustion chamber 111 adjacent to the adiabatic burner 2 mainly depends on the flame propagation speed of the fine slag fuel. Generally, the velocity of the gas passing through this point is maintained at 3~15 m / s during combustion.

[0041] In some embodiments, the cross-sectional area of ​​the combustion chamber 21 is larger than the maximum cross-sectional area of ​​the combustion cavity 111 to improve the combustion efficiency of fine slag fuel in the combustion chamber.

[0042] In some embodiments, the adiabatic burner 2 further includes a first flue gas inlet 22, which is located on the end face of the adiabatic burner 2 adjacent to the heat exchanger 3 and adjacent to the side wall of the adiabatic burner 2. The first flue gas inlet 22 communicates with the combustion chamber 21, and a portion of the flue gas discharged from the heat exchanger 3 can enter the combustion chamber 21 through the first flue gas inlet 22. There are multiple first flue gas inlets 22, which are arranged at intervals along the circumference of the adiabatic burner 2.

[0043] Specifically, the temperature of the flue gas discharged from heat exchanger 3 is 200~600℃, and the direction of the flue gas injected into combustion chamber 21 is opposite to the direction of the airflow injected into combustion chamber 21 from combustion chamber 111. The flue gas injected from the first flue gas inlet 22 has three main functions. The first is to cool the wall of the adiabatic burner 2, preventing the high-temperature gasified fine slag ash after ignition from adhering to the wall and causing coking. The second function is to form a reflux zone between the main flame and the wall of the adiabatic burner 2, so as to increase the residence time of gasified fine slag in the furnace and increase the burnout rate. The third function is to reduce the temperature of the flue gas in the adiabatic burner 2, which is beneficial to control the nitrogen oxides generated by the combustion of fine slag.

[0044] In some embodiments, the adiabatic burner 2 further has a second flue gas inlet 23, which is located on the side wall of the adiabatic burner 2 and communicates with the combustion chamber 21. There are multiple second flue gas inlets 23, which are arranged at intervals along the circumference of the adiabatic burner 2. Part of the flue gas discharged from the heat exchanger 3 can enter the combustion chamber 21 through the second flue gas inlet 23.

[0045] Specifically, when the length of the adiabatic burner 2 is relatively long or the flue gas ejected from the first flue gas inlet 22 is insufficient to cool the entire wall of the adiabatic burner 2, a second flue gas inlet 23 can be arranged on the wall of the adiabatic burner 2 in the opposite direction to the direction of the stable combustion flame. This can expand the range of the recirculation zone, cool the entire wall of the adiabatic burner 2, and prevent fine slag from coking.

[0046] In some embodiments, the flow direction of the flue gas entering the combustion chamber 21 through the first flue gas inlet 22 and the second flue gas inlet 23 is opposite to the direction of the airflow entering the combustion chamber 21 from the combustion chamber 111, so as to better cool the inner wall of the combustion chamber 21 and prevent coking.

[0047] The gasification fine slag combustion test method of this invention includes: Turn on the igniter 18 and introduce primary air and fine slag fuel into the combustion chamber 111 through the preheating fine slag channel 141, and introduce secondary air into the secondary air channel 151. The igniter 18 ignites the secondary air, primary air and fine slag fuel.

[0048] The flame in the combustion chamber 111 enters the combustion chamber 21, and preheated secondary air is introduced into the fine slag channel 121 to enter the combustion chamber 21. The flame continues to burn in the combustion chamber 21, and the temperature in the combustion chamber 21 rises.

[0049] A mixture of fine slag fuel and conveying air is introduced into the fine slag channel 121 to enter the combustion chamber 21, where the fine slag fuel and secondary air are burned.

[0050] Specifically, the combustion process of gasified fine slag is mainly divided into two stages: the preheating stage and the stable combustion stage.

[0051] During the preheating stage: Ignite 18 is turned on to form an ignition flame. The thermal power of the ignition flame is not less than 5% of the thermal power of the preheating burner 1. For incinerating fine ash fuel, the recommended thermal power of ignite 18 is 10-20%. After ignite 18 is ignited, the secondary air fan and the primary air fan are started. The secondary air volume can be gradually increased as the feed rate increases, or it can be quickly increased to the set air volume in a short time. If the flame of igniter 18 is stable at this time, the feeder is activated, and a mixture of fine slag fuel (less than 10% total water) and primary air is fed into the combustion chamber 111 through the preheated fine slag channel 141. This mixture collides with the return cap 16, and the fine slag fuel returns 180° counter-currently along the outer wall of the second pipe 13. Secondary air passes through the heat exchanger 3 and enters the secondary air inlet channel 151. After passing through the cyclone separator 17, the swirl number is 0.6~3.0. The secondary air enters the combustion chamber 111 rotating. Igniter 18, within the secondary air channel 151, sprays atomized ignition oil, which, along with the rotating secondary air, primary air, and fine slag fuel, combusts together. The counter-sprayed primary air carrying the fine slag fuel airflow forms a stable return zone A within the combustion chamber 111. The fine slag fuel in return zone A ignites, forming a flame. Preheated secondary air is then introduced into the fine slag channel 121.

[0052] Once the gasified fine slag ignites, the temperature of the preheated secondary air reaches above 100 ℃, and the temperature inside the preheater burner 1 exceeds 900 ℃, at which point the igniter 18 can be shut off. The fine slag fuel is stably ignited in the combustion chamber 111. Near the outlet of the adiabatic burner 2, the swirl number of the high-temperature flame gradually decreases, and the high-temperature flame presents a slender arrangement within the combustion chamber 21 of the preheater burner 1. The preheater burner 1 is continuously heated, and the temperature inside the combustion chamber 21 continues to rise. When the temperature inside the combustion chamber 21 reaches 800~900 ℃, the combustion process of the gasified fine slag reaches the next stage—the stable combustion stage.

[0053] During the stable combustion stage: The gasified fine slag can be stably burned in the adiabatic burner 2. The secondary air no longer needs to be preheated by the heat exchanger 3, but instead passes through the cyclone separator 17 at room temperature to obtain a swirl number of 0.6~3.0 before entering the combustion chamber 111. The mixture of fine slag fuel and conveying air for combustion of the gasified fine slag is switched to the fine slag channel 121. Since the mixture of fine slag fuel and conveying air is no longer introduced into the preheating fine slag channel 141, the flame in the combustion chamber 111 is extinguished and the temperature decreases. Since the secondary air gas does not undergo the temperature rise process of ignition in the recirculation zone A, the swirl intensity does not decrease, so it still maintains the swirl intensity of 0.6~3.0 generated after passing through the cyclone separator 17 when it flows out of the combustion chamber 111, forming a swirl recirculation zone B in the adiabatic burner 2. This zone entrains the high-temperature flue gas in the combustion chamber 21, continuously igniting the mixture of fine slag and air with a solid-to-gas ratio of 1.5~3.0 kg / kg ejected from the fine slag channel 121, forming the main flame.

[0054] Flue gas from the downstream flue of heat exchanger 3, with a temperature of 200-600℃, is introduced into the preheating fine slag channel 141. Its main function is to preheat the mixture of fine slag and conveying air within the fine slag channel 121. The flue gas in the preheating fine slag channel 141, after being sprayed from the return cap 16 and mixed with ambient temperature secondary air, flows into the combustion chamber 21. Another source of flue gas from the downstream flue of heat exchanger 3 is introduced into the first flue gas inlet 22.

[0055] The stable ignition stage is the process of normal combustion and utilization of gasified fine slag, and the stable combustion stage can be maintained continuously as needed.

[0056] Therefore, in the gasification fine slag combustion test device and test method of this invention, the fuel oil of the igniter 18 is only used in the initial stage of flame formation, lasting for about 5 minutes, and the fuel consumption is low, thus achieving high economic efficiency; the fine slag fuel is preheated by high-temperature flue gas before entering the adiabatic burner 2, and through the action of the recirculation zone B and recirculation zone C, the gasification fine slag has a long residence time in the preheating burner 1, resulting in a high burnout rate; the equipment is safe and reliable and can operate for a long time; the preheating burner 1 has a short operating time, and the adiabatic burner 2 wall has anti-coking measures, which can maintain a long service life and operating time; the pollutant emission level is low, and the flue gas generated during the combustion process can enter the first flue gas inlet 22 and the second flue gas inlet 23, reducing the local high temperature zone and oxygen concentration, and reducing the generation of nitrogen oxides.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0058] 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A gasification fine slag combustion test apparatus, characterized in that, include: A preheating burner (1) includes a body (11), a first pipe (12) and a second pipe (13). The body (11) has a combustion chamber (111). The first pipe (12) is disposed in the combustion chamber (111) and extends along a first direction. A fine slag channel (121) is formed inside the first pipe (12). The second pipe (13) is sleeved on the outside of the first pipe (12). A preheating fine slag channel (141) is formed between the inner wall surface of the second pipe (13) and the outer wall surface of the first pipe (12). A secondary air channel (151) is formed between the outer wall surface of the second pipe (13) and the inner wall surface of the body (11). An insulated burner (2) is connected to the body (11). The insulated burner (2) has a combustion chamber (21) which is connected to the combustion cavity (111). The first pipe (12) is connected to the combustion chamber (21) at one end near the insulated burner (2). The heat exchanger (3) is connected to the adiabatic burner (2). The flue gas in the adiabatic burner (2) can enter the heat exchanger (3). The flue gas passing through the heat exchanger (3) can enter the adiabatic burner (2) and the preheating fine slag channel (141). Some of the secondary air can enter the secondary air channel (151) and the fine slag channel (121) after heat exchange through the heat exchanger (3).

2. The gasification fine slag combustion test apparatus according to claim 1, characterized in that, The preheating burner (1) also includes: A return cap (16) is provided on the bottom surface of the combustion chamber (111) adjacent to the insulated burner (2). The return cap (16) has a groove (161) on the side away from the insulated burner (2). The groove (161) is arc-shaped. One end of the first pipe (12) passes through the groove (161) and communicates with the burner. One end of the second pipe (13) extends into the groove (161). A cyclone separator (17) is provided at one end of the secondary air duct (151) away from the insulated burner (2) and is arranged in a ring around the outer periphery of the second pipe (13); Ignition device (18) is located at one end of the secondary air duct (151) away from the insulated burner (2) to achieve ignition function.

3. The gasification fine slag combustion test apparatus according to claim 1, characterized in that, The central axis of the first pipe (12), the central axis of the second pipe (13), and the central axis of the body (11) are collinear.

4. The gasification fine slag combustion test apparatus according to claim 1, characterized in that, Along the first direction from one end of the body (11) away from the adiabatic burner (2) to one end of the body (11) adjacent to the adiabatic burner (2), the cross-sectional area of ​​the body (11) gradually increases.

5. The gasification fine slag combustion test apparatus according to claim 1, characterized in that, The cross-sectional area of ​​the combustion chamber (21) is greater than the maximum cross-sectional area of ​​the combustion cavity (111).

6. The gasification fine slag combustion test apparatus according to claim 1, characterized in that, The insulated burner (2) also has a first flue gas inlet (22), which is located on the end face of the insulated burner (2) adjacent to the heat exchanger (3). The first flue gas inlet (22) is adjacent to the side wall of the insulated burner (2) and communicates with the combustion chamber (21). Part of the flue gas discharged from the heat exchanger (3) can enter the combustion chamber (21) through the first flue gas inlet (22).

7. The gasification fine slag combustion test apparatus according to claim 6, characterized in that, There are multiple first flue gas inlets (22), and the multiple first flue gas inlets (22) are arranged at intervals along the circumference of the adiabatic burner (2).

8. The gasification fine slag combustion test apparatus according to claim 6, characterized in that, The adiabatic burner (2) also has a second flue gas inlet (23), which is located on the side wall of the adiabatic burner (2) and communicates with the combustion chamber (21). There are multiple second flue gas inlets (23), which are arranged at intervals along the circumference of the adiabatic burner (2). Part of the flue gas discharged from the heat exchanger (3) can enter the combustion chamber (21) through the second flue gas inlet (23).

9. The gasification fine slag combustion test apparatus according to claim 8, characterized in that, The flow direction of the flue gas entering the combustion chamber (21) through the first flue gas inlet (22) and the second flue gas inlet (23) is opposite to the direction of the airflow entering the combustion chamber (21) from the combustion chamber (111).

10. A method for testing the combustion of gasified fine slag, characterized in that, include: Turn on the igniter (18) and introduce primary air and fine slag fuel into the combustion chamber (111) through the preheating fine slag channel (141), and introduce secondary air into the secondary air channel (151). The igniter (18) ignites the secondary air, primary air and fine slag fuel. The flame in the combustion chamber (111) enters the combustion chamber (21), and preheated secondary air is introduced into the fine slag channel (121) to enter the combustion chamber (21). The flame continues to burn in the combustion chamber (21), and the temperature in the combustion chamber (21) rises. A mixture of fine slag fuel and conveying air is introduced into the fine slag channel (121) to enter the combustion chamber (21), where the fine slag fuel and secondary air are burned.

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