Fuel supply structure and method and combustion system

Abstract

The present invention relates to a fuel supply structure, a fuel supply method and a combustion system. The fuel supply structure comprises: a vertical pipe, the pipe wall of which defines a reaction space; a fuel supply pipe, which is arranged around at least a part of the reaction space to be suitable for receiving heat from the reaction space, the fuel inlet of the supply pipe is connected to the outside of the vertical pipe for receiving fuel, the fuel outlet of the supply pipe is connected to the reaction space to provide fuel to the reaction space, and the fuel is suitable for reacting in the reaction space.

Description

Technical Field

[0001] The invention relates to the field of combustion technology, in particular to a fuel supply structure and method, and a combustion system. Background Art

[0002] Coal is a major fossil energy source, among which bituminous coal is the main type of coal used in power plant boilers and industrial boilers. Anthracite, due to its low volatile content, usually has problems such as difficulty in ignition, poor ignition stability under low load, and NOx. In addition, a large number of by-products are produced every year in the coal chemical industry, such as pyrolysis coke and gasification residual carbon. These fuels still have high carbon content and calorific value, and combustion is one of the most effective ways to recycle these fuels. However, the volatile content of this type of fuel is often lower than that of anthracite, and the problems it has are more serious than those of anthracite. Therefore, how to achieve clean and efficient combustion and utilization of such low-volatile carbon-based fuels has become a key technical bottleneck restricting the industrial application of clean and efficient cascade utilization of coal, and it needs to be solved urgently.

[0003] Chinese patent CN201410367608 proposes a powdered fuel self-preheating device and method, and a powdered fuel combustion boiler system. Based on the circulating fluidized bed combustion technology, it proposes a powdered fuel self-preheating method, in which the powdered fuel is partially burned in the circulating fluidized bed preheating chamber to release heat, thereby realizing the self-preheating of the fuel. The gas outlet of the circulating fluidized bed preheating chamber separator is connected to a powdered fuel outlet pipe, which is used to send the preheated powdered fuel and flue gas to the furnace, and the powdered fuel is mixed with secondary air and tertiary air in the furnace for combustion. This combustion method and system are suitable for anthracite and other low-volatile carbon-based fuels, as well as bituminous coal, lignite, etc., to achieve clean and efficient combustion and utilization of multiple fuels.

[0004] However, when the system uses coal with high cohesiveness, the cohesive substances in the coal will precipitate rapidly under the combined effects of the temperature of 800-1300℃, the extremely high heating rate and the reducing atmosphere in the preheating chamber, and may bind the powdered fuel into agglomerates or blocks. The sticking phenomenon may cause large coke lumps or blocks to appear in the preheating burner, which is not conducive to the stable operation of the fuel self-preheating device.

[0005] Patent CN102120936B introduces a method and device for jet pre-oxidation pyrolysis fluidized bed gasification of carbon-containing solid fuels, which is a solution and device for the phenomenon that cohesive carbon-containing solid fuels are prone to cohesion in fluidized bed gasifiers. The structure, operation mode, furnace atmosphere and chemical reaction of the fluidized bed gasifier are similar to those of the preheating burner, and have a certain reference value. This method actually utilizes the characteristics that the functional groups in coal that may cause cohesion will undergo oxidation reaction under aerobic conditions of 200-300°C and precipitate or convert into non-cohesive substances. The solid fuel particles are sprayed into the dilute phase zone of the fluidized bed reactor at high speed. When the fuel particles are heated to the temperature range where the cohesive functional groups precipitate, they are in a highly dispersed state in the dilute phase zone, and will not adhere to each other, but the precipitated substances will be rapidly oxidized, thereby reducing the cohesiveness of the fuel, avoiding the cohesion and coking of highly cohesive fuels in the fluidized bed, and improving the reaction environment. The method proposed in this patent has extremely high requirements for the control of operating parameters, because even the heating rate and material concentration in the dilute phase zone of the fluidized bed are difficult to control accurately. It is very difficult to meet the temperature range and material dispersion distribution state required to reduce the viscosity. Therefore, this method has limited effect in reducing the viscosity of the fuel. Summary of the invention

[0006] The present invention is proposed to alleviate or solve at least one aspect of the above-mentioned problems in the prior art.

[0007] According to one aspect of an embodiment of the present invention, a fuel supply structure is provided, comprising:

[0008] A vertical tube, the tube wall of which defines a reaction space;

[0009] A fuel supply pipe, wherein the supply pipe is arranged around at least a portion of the reaction space to be suitable for receiving heat from the reaction space, a fuel inlet of the supply pipe is connected to the outside of the vertical pipe for receiving fuel, and a fuel outlet of the supply pipe is connected to the reaction space to provide fuel to the reaction space, and the fuel is suitable for reacting in the reaction space.

[0010] According to yet another aspect of an embodiment of the present invention, a combustion system is provided, comprising: a furnace; and the above-mentioned fuel supply structure.

[0011] According to another aspect of an embodiment of the present invention, a fuel supply method of the above-mentioned fuel supply structure is provided, comprising the steps of:

[0012] Controlling the temperature of the fuel entering the supply pipe between the fuel inlet and the fuel outlet of the supply pipe to be within the range of 200-300° C.; or

[0013] The temperature of the fuel entering the supply pipe is controlled in a portion of the supply pipe between a fuel inlet and a fuel outlet of the supply pipe so that at least a portion of the fuel is pre-oxidized in the supply pipe to reduce adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following description and accompanying drawings may better help understand these and other features and advantages of various embodiments disclosed by the present invention, wherein the same reference numerals in the drawings always represent the same components, wherein:

[0015] Figure 1 A schematic structural diagram of a fuel supply device according to an exemplary embodiment of the present invention;

[0016] Figure 2 The coil form of the fuel supply pipe is shown as an example, wherein the supply pipe is a single pipe. Figure 2 The right picture in Figure 2 The C-direction view of the left figure in FIG.

[0017] Figure 3 An example is shown Figure 1 The cross-sectional view along the AA direction;

[0018] Figure 4 An example is shown Figure 1 The cross-sectional view along the BB direction;

[0019] Figure 5 The coil form of the fuel supply pipe is exemplarily shown, wherein the supply pipe is two supply pipes;

[0020] Fig. 6A and Figure 6B Schematic top views of supply pipes according to different embodiments of the present invention are shown as examples. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further specifically described below by examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0022] The purpose of the present invention is to overcome the problem in the prior art that highly caking coal is easily adhered to form lumps or blocks in a preheating burner, thereby causing the preheating burner to be unable to operate normally.

[0023] Based on the above purpose, a fuel supply structure is proposed, which can heat the supplied fuel by using the heat released by the reaction space before the fuel is supplied to the reaction space. Specifically, the fuel supply pipe is arranged around at least a portion of the reaction space so that the fuel in the supply pipe absorbs the heat from the reaction space. In a specific example, the supply pipe can be in a spiral disk form, and the spiral disk form is arranged around the reaction space.

[0024] In this way, by utilizing the above-mentioned arrangement structure, the fuel can be gradually heated to a temperature that converts the adhesive substance in the fuel into non-adhesive substance before entering the reaction space. This avoids the problem of fuel adhesion or agglomeration caused by the sudden or rapid precipitation of adhesive substances in the fuel, such as coal powder, due to sudden or rapid heating in the reaction space, thereby helping to reduce the adhesion of the fuel in the reaction space or reduce the tendency of the fuel to stick together into agglomerates, and also makes good use of the heat of the reaction space and saves space.

[0025] The above-mentioned reaction space can be a pretreatment space or a preheating space, or a combustion space. Correspondingly, the above-mentioned fuel supply structure can be a preheating burner or a burner. The preheating burner is suitable for providing high-temperature fuel to the subsequent furnace (the high-temperature fuel here is the fuel or combustion product that has been partially burned and released heat in the reaction space).

[0026] Correspondingly, the present invention also proposes a combustion system, which may include the above-mentioned fuel supply structure.

[0027] In the present invention, a fuel supply pipe that absorbs heat from the reaction space, such as a fuel supply pipe in the form of a coil, is used so that the fuel is gradually heated when flowing in the coil to control the precipitation and conversion of the adhesive substance in the fuel. Accordingly, the present invention proposes a fuel supply method using the above-mentioned fuel supply structure, which mainly uses the above-mentioned fuel supply structure to control the temperature of a part of the supply pipe between the fuel inlet and the fuel outlet of the supply pipe that enters the supply pipe within the range of 200-300°C; or controls the temperature of a part of the supply pipe between the fuel inlet and the fuel outlet of the supply pipe that enters the supply pipe so that at least a part of the fuel is pre-oxidized in the supply pipe to reduce the adhesiveness. In this way, before entering the intense and rapidly heated reaction space, at least part of the adhesive substance has been converted into a non-adhesive substance, which helps to reduce the adhesion of the fuel in the reaction space or reduce the tendency of the fuel to agglomerate.

[0028] It should also be pointed out that, although the fuel supply pipe in the form of a coil is used in the description of the fuel supply structure and the combustion system, and the fuel supply pipe in the form of a coil is also used in the present invention to precipitate or transform the adhesive material in the fuel in advance, the present invention also protects the structure using the above-mentioned fuel supply pipe in the form of a coil, regardless of whether it has the technical effect of precipitating or transforming the adhesive material in the fuel in advance. It should also be pointed out that in the present invention, the fuel supply pipe is not limited to the coil form shown in the figure, nor is it limited to being arranged around the entire reaction space, as long as the fuel supply pipe can be arranged around at least a part of the reaction space to absorb heat from the reaction space to heat the fuel.

[0029] The fuel supply structure of the present invention is exemplarily described below with reference to the accompanying drawings. In the present invention, coal powder is used as an example of fuel for description. As can be understood by those skilled in the art, other fuels that may cause rapid precipitation of cohesive substances and cause cohesion can also be applied to the structure and method of the present invention, and are within the scope of protection of the present invention.

[0030] Figure 1 The fuel supply structure shown is based on the circulating fluidized bed preheating chamber 1 (i.e., the riser, corresponding to the vertical pipe). Figure 1 As shown, the powder feeding pipe 2 (corresponding to the fuel supply pipe) is arranged inside the pipe wall of the preheating chamber 1 or the riser. The pipe wall defines an internal combustion space.

[0031] In an exemplary embodiment of the present invention, the outermost layer of the preheating chamber 1 is a steel shell structure, and the refractory material 3 is poured inside to provide heat preservation and wear resistance for the bed material circulation at 800-1300° C. in the preheating burner cavity.

[0032] like Figure 1 As shown, the powder feeding pipe 2 is a spiral coil, buried in the refractory material 3, and can be a heat-resistant steel pipe or directly cast. When a heat-resistant steel pipe is used as the powder feeding pipe, an expansion buffer layer, such as high-temperature resistant insulation cotton, needs to be laid between the powder feeding pipe 2 and the refractory material 3 to buffer the thermal expansion.

[0033] One end of the powder feeding pipe 2 is a fuel inlet 21, which is used to connect with the upstream powder feeding air pipe led from the powder feeding system. The coal powder is carried into the powder feeding pipe 2 by the powder feeding air, and finally ejected from the fuel outlet 22 at the other end of the powder feeding pipe 2, entering the interior of the preheating burner or entering the combustion space. The fuel outlet 22 is connected to the interior of the preheating burner or the combustion space. Figure 3 An example is shown Figure 1 The cross-sectional view in the AA direction, Figure 4 An example is shown Figure 1 The cross-sectional view along the BB direction is as follows: Figure 3 As shown, the fuel inlet 21 is located outside the preheating chamber 1. Figure 4 As shown, the fuel outlet 22 opens into the combustion space within the preheating chamber.

[0034] Figure 2 The coil form of the powder feeding pipe is shown as an example, wherein the powder feeding pipe is a single pipe. Figure 2 The right picture in Figure 2 The C-direction view of the left figure in FIG. It can be seen that Figure 2 In the embodiment, the fuel inlet 21 is located above the fuel outlet 22 in the height direction. However, in the present invention, the height positions of the fuel inlet 21 and the fuel outlet 22 are not limited to the above embodiment. For example, the two may be located at approximately the same height position, and even the height of the fuel inlet may be lower than the height of the fuel outlet 22, as long as the position of the fuel outlet 22 entering the preheating chamber is relatively low to provide sufficient reaction time or space for the fuel.

[0035] The principle of reducing the cohesiveness of coal powder by the technical solution of the present invention is:

[0036] Based on Figure 1-4 In the embodiment shown, the pulverized coal enters the pulverized coal feeding pipe 2 along with the pulverized coal feeding air, and the temperature inside the preheating burner can be 800-1300°C. The heat is transferred to the pulverized coal feeding pipe 2 through the refractory material 3, so that the pulverized coal in the pulverized coal feeding pipe 2 is heated. The position of the pulverized coal feeding pipe 2 in the refractory material 3 and the number of coil layers or the total length of the pipeline or the number of spiral turns of the coil can be taken into consideration, and the pulverized coal feeding air volume (or wind speed) can be adjusted during operation to control the temperature in the reaction space, and to select whether the coil is completely inside the tube wall or partially exposed from the tube wall to the reaction space or completely inside the reaction space, etc., to control the temperature of the pulverized coal in the coil or supply pipe to be controlled at 200-300°C. At this temperature, the pulverized coal reacts chemically with the oxygen in the pulverized coal feeding air, causing the precipitate of the adhesive functional groups or oxidation into non-adhesive functional groups. Therefore, the fuel entering the preheating chamber of the preheating burner from the pulverized coal feeding pipe 2 will no longer cause the pulverized coal to stick when it burns or reacts in the reaction space.

[0037] The technical solution of the present invention also has the technical effect of reducing the amount of refractory materials and the overall weight of the preheating burner riser, which is specifically described as follows. The refractory materials of the preheating burner riser are mainly wear-resistant and heat-insulating. When the internal temperature of the preheating burner reaches 800-1300°C, the shell temperature is maintained below 60°C, for example. This heat-insulating effect is mainly due to the heat-insulating properties of the refractory materials. After the powder feeding pipe 2 of this solution is buried in the refractory material 3, the powder-carrying airflow flowing in the powder feeding pipe will have a certain cooling effect, thereby reducing the amount of refractory materials to a certain extent, thereby reducing the overall weight of the preheating burner.

[0038] Figure 5The coil form of the powder feeding pipe is exemplarily shown, wherein there are two powder feeding pipes. It can be seen that the two powder feeding pipes form two rows of coil forms in a parallel manner.

[0039] exist Fig. 6A and Figure 6B In the embodiment, four fuel outlets 22 are exemplarily arranged spaced apart in the circumferential direction.

[0040] It should be pointed out that Figure 5 , Fig. 6A and Figure 6B There are two and four powder feeding pipes shown in the figure, and the fuel outlets 22 are arranged opposite to each other in the circumferential direction on the same horizontal plane, but the present invention is not limited thereto.

[0041] For example, other numbers of powder feeding pipes may be arranged side by side, such as 3, 5 or more.

[0042] For another example, the plurality of fuel outlets 22 may be arranged on a plane perpendicular to the axis of the riser. Alternatively, the plurality of fuel outlets 22 may be arranged in sequence and spaced apart in the axial direction of the riser. The plurality of fuel outlets 22 spaced apart in sequence in the height direction may be on the same axis, or may be spaced apart from each other in the circumferential direction or the circumferential direction. In a further embodiment, the spacing may be equiangular spacing.

[0043] If multi-channel powder feeding is adopted, the powder feeding pipe 2 adopts a parallel multi-row coil type, and the position of the outlet of each coil, that is, the fuel outlet, can be adjusted as needed to achieve flexible setting of the powder feeding amount and powder feeding position.

[0044] In such Figure 2 As shown, especially referring to the left figure, it can be seen that the fuel sprayed from the fuel outlet into the combustion space will be inclined downward, but the present invention is not limited to this. For example, the axis of the fuel outlet can be horizontal or can be inclined upward. More specifically, for example, the main body of the powder feeding pipe 1 includes a spiral pipe section and an inclined upward circumferential extension connected to the lower part of the spiral pipe section, and the fuel outlet 22 is arranged on the inclined upward circumferential extension. The angle formed between the axial direction of the fuel outlet and the plane perpendicular to the axis of the vertical pipe is in the range of 10° to 80°. For another example, the angle formed between the axial direction of the fuel outlet 22 and the plane perpendicular to the axis of the preheating chamber 1 (i.e., the horizontal plane) is in the range of 10° to 80°. These are all within the protection scope of the present invention.

[0045] exist Figure 1-2In the embodiment, the lower part of the powder feeding pipe 2 is still a spiral pipe section, but the present invention is not limited thereto. For example, the main body of the powder feeding pipe includes a spiral pipe section and a horizontal pipe section arranged at the lower part of the spiral pipe section and connected to the spiral pipe section, the horizontal pipe section is arranged along the circumferential direction, the fuel outlet 22 is arranged in the horizontal pipe section, and the plane where the horizontal pipe section is located is perpendicular to the axis of the vertical pipe.

[0046] exist Figure 1 In the structure shown, the main body of the powder feed pipe 2 is located within the wall of the preheating chamber 1, but the present invention is not limited thereto. For example, the main body of the powder feed pipe may be entirely located within the combustion space and disposed along the inner wall of the preheating chamber 1. For another example, a portion of the main body of the powder feed pipe in the radial direction is located in the pipe wall of the preheating chamber 1 and another portion of the main body of the powder feed pipe 1 in the radial direction is located within the combustion space.

[0047] exist Figure 1 In the fuel supply structure shown, the preheating chamber 1 is a riser, which is connected to the cyclone separator 4 and the returner 5 in pairs. However, the present invention is not limited to this. In other words, in the present invention, the preheating space where the spiral disc-shaped powder feeding pipe is arranged is not limited to the form of a riser connected to the cyclone separator and the returner, but can be in the form of a separate preheating chamber or a gasification chamber. In this case, the outlet of the preheating chamber or the gasification chamber directly constitutes the outlet of the fuel supply structure.

[0048] like Figure 1 The fuel supply structure shown can also be used as a preheat burner. Figure 1 The outlet of the structure shown corresponds to the high-temperature flue gas outlet of the cyclone separator.

[0049] Based on the above, the present invention provides a powder feeding pipe arrangement method and a preheating burner containing the same. By arranging the powder feeding pipe as a spiral coil, the coal powder is appropriately preheated in the powder feeding pipe to increase the temperature, thereby reducing the adhesion of the sticky coal powder in the preheating burner, and further preventing the coal powder from sticking into clumps in the preheating burner.

[0050] The present invention provides a powder feeding pipe arrangement method and a preheating burner containing the same, which has the technical effect of reducing the amount of refractory material used in the preheating burner riser pipe, thereby reducing the overall weight of the preheating burner, and reducing the installation cost and difficulty.

[0051] In the present invention, the numerical range mentioned may be not only the endpoint values, but also the median values ​​or other values ​​between the endpoint values, all of which are within the protection scope of the present invention.

[0052] Based on the above, the present invention proposes the following technical solutions:

[0053] A fuel supply structure suitable for coal powder, comprising:

[0054] A vertical tube, the tube wall of which defines a reaction space;

[0055] A fuel supply pipe, wherein the supply pipe is arranged around at least a portion of the reaction space to be suitable for receiving heat from the reaction space, so as to make the temperature of the fuel entering the supply pipe in a portion of the supply pipe between the fuel inlet and the fuel outlet of the supply pipe within the range of 200-300°C or to make at least a portion of the fuel pre-oxidized in the supply pipe to reduce adhesion, the fuel inlet of the supply pipe is connected to the outside of the vertical pipe for receiving the fuel, the fuel outlet of the supply pipe is connected to the reaction space to provide the fuel to the reaction space, and the fuel is suitable for reacting in the reaction space.

[0056] Wherein: the main body of the supply pipe is arranged in the pipe wall of the vertical pipe; or

[0057] A portion of the main body of the supply pipe in the radial direction is located in the pipe wall of the vertical pipe, and / or another portion of the main body of the supply pipe in the radial direction is located in the reaction space; or

[0058] The main body of the supply pipe is entirely located in the reaction space and is arranged along the inner wall of the vertical pipe.

[0059] Optionally, the supply pipe is arranged around the reaction space in a spiral coil to be suitable for receiving heat from the reaction space.

[0060] Optionally, the fuel inlet of the supply pipe is located above the fuel outlet of the supply pipe in the height direction of the vertical pipe.

[0061] Optionally, the main body of the supply pipe includes a spiral pipe section and a horizontal pipe section arranged at the lower part of the spiral pipe section and connected to the spiral pipe section, the horizontal pipe section is arranged along the circumferential direction, the fuel outlet is arranged in the horizontal pipe section, and the plane where the horizontal pipe section is located is perpendicular to the axis of the vertical pipe; or

[0062] The main body of the supply pipe includes a spiral pipe section, and the fuel outlet is arranged in the spiral pipe section; and

[0063] The angle formed between the axial direction of the fuel outlet and the plane perpendicular to the axis of the vertical pipe is in the range of 10° to 80°; or

[0064] The main body of the supply pipe includes a spiral pipe section and an inclined upward circumferential extension portion connected to the lower part of the spiral pipe section, the fuel outlet is arranged on the inclined upward circumferential extension portion, and the angle formed between the axial direction of the fuel outlet and the plane perpendicular to the axis of the vertical pipe is in the range of 10° to 80°.

[0065] Optionally, the supply pipe comprises a single supply pipe; or

[0066] The supply pipes include n supply pipes, and the plurality of supply pipes form n rows of coils, where n is a natural number greater than 1.

[0067] Optionally, the fuel outlets of the n supply pipes are arranged sequentially in the axial direction of the vertical pipe.

[0068] Optionally, the fuel outlets of the n supply pipes are arranged on the same axis; or

[0069] The fuel outlets of the n supply pipes are arranged spaced apart in the circumferential direction.

[0070] Optionally, the fuel outlets of the n supply pipes are spaced apart in the circumferential direction and are located on the same plane perpendicular to the axis of the vertical pipe.

[0071] Optionally, the vertical pipe is a riser.

[0072] Optionally, the fuel supply structure further includes:

[0073] A cyclone separator and a material returner, wherein the lifting pipe, the cyclone separator and the material returner are communicated with each other.

[0074] in:

[0075] The reaction space is a combustion space, and the fuel supply structure is a burner; or

[0076] The reaction space is a preheating space or a pretreatment space, and the fuel supply structure is a preheating burner.

[0077] Optionally, the fuel supply structure is a preheating burner and includes a cyclone separator and a material returner. The riser, cyclone separator and material returner are interconnected, and the structure outlet is the outlet of the cyclone separator.

[0078] The present invention also provides a combustion system, comprising:

[0079] Furnace; and a fuel supply structure as described in any of the above technical solutions.

[0080] The present invention further proposes a fuel supply method using the fuel supply structure described in any of the above technical solutions, comprising the steps of:

[0081] Controlling the temperature of the fuel entering the supply pipe between the fuel inlet and the fuel outlet of the supply pipe to be within the range of 200-300° C.; or

[0082] The temperature of the fuel entering the supply pipe is controlled in a portion of the supply pipe between a fuel inlet and a fuel outlet of the supply pipe so that at least a portion of the fuel is pre-oxidized in the supply pipe to reduce adhesion.

[0083] in:

[0084] Controlling the temperature of at least a portion of the rear half of the supply pipe between the fuel inlet and the fuel outlet of the supply pipe to be within the range of 200-300° C.; or

[0085] The temperature in the reaction space is controlled within the range of 800-1300°C.

[0086] The temperature of the fuel entering the reaction space from the fuel outlet of the supply pipe is controlled to be within the range of 200-300°C.

[0087] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fuel supply structure suitable for coal powder, comprising: A vertical tube, the tube wall of which defines a reaction space; A fuel supply pipe, wherein the supply pipe is arranged around at least a portion of the reaction space to be suitable for receiving heat from the reaction space, so as to make the temperature of the fuel entering the supply pipe in a portion of the supply pipe between the fuel inlet and the fuel outlet of the supply pipe within the range of 200-300°C or to make at least a portion of the fuel pre-oxidized in the supply pipe to reduce adhesion, the fuel inlet of the supply pipe is connected to the outside of the vertical pipe for receiving the fuel, the fuel outlet of the supply pipe is connected to the reaction space to provide the fuel to the reaction space, and the fuel is suitable for reacting in the reaction space.

2. The fuel supply structure according to claim 1, wherein: The main body of the supply pipe is arranged in the pipe wall of the vertical pipe; or A portion of the main body of the supply pipe in the radial direction is located in the pipe wall of the vertical pipe, and / or another portion of the main body of the supply pipe in the radial direction is located in the reaction space; or The main body of the supply pipe is entirely located in the reaction space and is arranged along the inner wall of the vertical pipe.

3. The fuel supply structure according to claim 1, wherein: The supply pipe is disposed around the reaction space in a spiral coil manner to be suitable for receiving heat from the reaction space.

4. The fuel supply structure according to claim 3, wherein: The fuel inlet of the supply pipe is located above the fuel outlet of the supply pipe in the height direction of the vertical pipe.

5. The fuel supply structure according to claim 3, wherein: The main body of the supply pipe includes a spiral pipe section and a horizontal pipe section arranged at the lower part of the spiral pipe section and connected to the spiral pipe section, the horizontal pipe section is arranged along the circumferential direction, the fuel outlet is arranged in the horizontal pipe section, and the plane where the horizontal pipe section is located is perpendicular to the axis of the vertical pipe; or The main body of the supply pipe includes a spiral pipe section, and the fuel outlet is arranged in the spiral pipe section; and The angle formed between the axial direction of the fuel outlet and the plane perpendicular to the axis of the vertical pipe is in the range of 10° to 80°; or The main body of the supply pipe includes a spiral pipe section and an inclined upward circumferential extension portion connected to the lower part of the spiral pipe section, the fuel outlet is arranged on the inclined upward circumferential extension portion, and the angle formed between the axial direction of the fuel outlet and the plane perpendicular to the axis of the vertical pipe is in the range of 10° to 80°.

6. The fuel supply structure according to claim 1, wherein: The supply pipe comprises a single supply pipe; or The supply pipes include n supply pipes, and the plurality of supply pipes form n rows of coils, where n is a natural number greater than 1.

7. The fuel supply structure according to claim 6, wherein: The fuel outlets of the n supply pipes are arranged sequentially in the axial direction of the vertical pipe.

8. The fuel supply structure according to claim 7, wherein: The fuel outlets of the n supply pipes are arranged on the same axis; or The fuel outlets of the n supply pipes are arranged spaced apart in the circumferential direction.

9. The fuel supply structure according to claim 6, wherein: The fuel outlets of the n supply pipes are arranged spaced apart in the circumferential direction and are located on the same plane perpendicular to the axis of the vertical pipe.

10. The fuel supply structure according to claim 1, wherein: The vertical pipe is a riser.

11. The fuel supply structure according to claim 10, further comprising: A cyclone separator and a material returner, wherein the lifting pipe, the cyclone separator and the material returner are communicated with each other.

12. The fuel supply structure according to any one of claims 1 to 11, wherein: The reaction space is a combustion space, and the fuel supply structure is a burner; or The reaction space is a preheating space or a pretreatment space, and the fuel supply structure is a preheating burner.

13. The fuel supply structure according to claim 11, wherein: The fuel supply structure is a preheating burner and includes a cyclone separator and a material returner. The riser, cyclone separator and material returner are interconnected, and the structure outlet is the outlet of the cyclone separator.

14. A combustion system comprising: furnace; and A fuel supply structure as claimed in any one of claims 1 to 13.

15. A fuel supply method using the fuel supply structure according to any one of claims 1 to 13, comprising the steps of: Controlling the temperature of the fuel entering the supply pipe between the fuel inlet and the fuel outlet of the supply pipe to be within the range of 200-300° C.; or The temperature of the fuel entering the supply pipe is controlled in a portion of the supply pipe between a fuel inlet and a fuel outlet of the supply pipe so that at least a portion of the fuel is pre-oxidized in the supply pipe to reduce adhesion.

16. The method of claim 15, wherein: Controlling the temperature of at least a portion of the rear half of the supply pipe between the fuel inlet and the fuel outlet of the supply pipe to be within the range of 200-300° C.; or The temperature in the reaction space is controlled within the range of 800-1300°C.

17. The method of claim 16, wherein: The temperature of the fuel entering the reaction space from the fuel outlet of the supply pipe is controlled to be within the range of 200-300°C.

Images