Atomization spray gun and coal water slurry atomization combustion system with same

Abstract

The utility model provides an atomizing spray gun and a coal water slurry atomizing combustion system with the atomizing spray gun, the atomizing spray gun comprises a first shell, the first shell is provided with a first mounting cavity, a first opening and a flue gas inlet which are communicated with one another, the first opening is arranged on the end face of the first end of the first shell, and the flue gas inlet is arranged on the side wall of the first shell; the coal water slurry spray gun is arranged in the first shell in a penetrating manner, a combustion-supporting gas channel is formed between the coal water slurry spray gun and the first shell, the combustion-supporting gas channel is communicated with the flue gas inlet, a slurry outlet of the coal water slurry spray gun is formed in the first end of the coal water slurry spray gun, and the first end of the coal water slurry spray gun penetrates out of the first end of the first shell; and the gas suction and rolling structure is arranged in the first mounting cavity, the gas suction and rolling structure is arranged close to the smoke inlet, and in the circulation process of the combustion-supporting gas, gas on the outer side of the first shell is sucked and rolled into the first shell through the gas suction and rolling structure. According to the scheme, the problems that in the prior art, an additional preheating device is arranged to preheat combustion-supporting gas, the cost is high, and operation is tedious can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water coal slurry combustion, and particularly relates to an atomizing spray gun and a water coal slurry atomizing combustion system having the same. Background Art

[0002] Water coal slurry is a flowable slurry fuel formed by mixing pulverized coal, water and a small amount of additives. In order to achieve efficient combustion and utilization of water coal slurry fuel, the water coal slurry is usually atomized by an atomizing spray gun. After atomization, the water coal slurry forms fine slurry droplets, and each slurry droplet usually includes several fine pulverized coal particles. After entering the furnace, the slurry droplets are heated and evaporated, exposing the pulverized coal particles in the furnace until they are completely burned.

[0003] In order to improve the stability of the combustion process, in the prior art, it is usually necessary to set up an additional preheating device to preheat the combustion-supporting gas flowing through the spray gun. However, preheating the combustion-supporting gas by additionally setting up a preheating device has a high cost and complicated operation. Summary of the Utility Model

[0004] The utility model provides an atomizing spray gun and a water coal slurry atomizing combustion system having the same, so as to solve the problems in the prior art that preheating the combustion-supporting gas by setting up an additional preheating device has a high cost and complicated operation.

[0005] According to one aspect of the utility model, an atomizing spray gun is provided. The atomizing spray gun includes: a first housing having a first installation cavity, a first opening and a flue gas inlet, the first opening and the flue gas inlet are respectively communicated with the first installation cavity, the first opening is arranged on the end face of the first end of the first housing, and the flue gas inlet is arranged on the side wall of the first housing; a water coal slurry spray gun is arranged in the first housing, a combustion-supporting gas channel is formed between the water coal slurry spray gun and the first housing, the combustion-supporting gas channel is communicated with the flue gas inlet, the water coal slurry spray gun has a slurry channel, a slurry inlet and a slurry outlet, the slurry inlet and the slurry outlet are respectively communicated with the slurry channel, the slurry outlet is arranged at the first end of the water coal slurry spray gun, and the first end of the water coal slurry spray gun penetrates out of the first end of the first housing; a gas suction structure is arranged in the first installation cavity, the gas suction structure is arranged close to the flue gas inlet, and during the flow of the combustion-supporting gas, the gas outside the first housing is sucked into the first housing through the gas suction structure.

[0006] Further, the atomizing spray gun further includes: a second housing having a second installation cavity and a second opening. The second opening communicates with the second installation cavity and is provided on the end face of the first end of the second housing. The water slurry spray gun, the second housing, and the first housing are sleeved from inside to outside in sequence. The first end of the second housing is disposed close to the first end of the first housing. The second housing divides the combustion-supporting gas passage into an independent first combustion-supporting gas passage and a second combustion-supporting gas passage. The first combustion-supporting gas passage is located outside the second combustion-supporting gas passage. The first combustion-supporting gas passage includes a first connection section, a second connection section, and a third connection section that are sequentially connected along the flow direction of the combustion-supporting gas. The flow areas of the first connection section and the third connection section are respectively larger than the flow area of the second connection section. The flue gas inlet is provided on the side wall of the second connection section. The first connection section, the second connection section, and the third connection section form a gas suction structure.

[0007] Further, along the extending direction of the second housing, the distance between the outer side wall of the second housing and the inner side wall of the first housing is the same. The atomizing spray gun further includes: a convex block provided on the outer side wall of the second housing. The flue gas inlet is disposed opposite to the convex block. There is a distance between the convex block and the flue gas inlet. Along the axial direction of the flue gas inlet, the projection of the flue gas inlet is located on the convex block.

[0008] Further, the convex block has a guiding inclined surface located on the side of the flue gas inlet close to the first combustion-supporting gas inlet. Along the direction from the first combustion-supporting gas inlet to the flue gas inlet, the distance between the guiding inclined surface and the outer side wall of the second housing gradually increases.

[0009] Further, the atomizing spray gun further includes a swirler assembly. The swirler assembly includes swirler vanes and a mounting sleeve. The mounting sleeve is sleeved on the outer periphery of the water slurry spray gun. A plurality of swirler vanes are provided, and the plurality of swirler vanes are annularly and spaced along the circumferential direction of the mounting sleeve on the outer side wall of the mounting sleeve.

[0010] Further, a plurality of flue gas inlets are provided, and the plurality of flue gas inlets are distributed at intervals along the circumferential direction of the first housing and / or along the axial direction of the first housing.

[0011] Further, the atomizing spray gun further includes: a third housing having a third installation cavity and a third opening that communicate with each other. The third opening is provided on the end face of the first end of the third housing. The third housing is penetrated through the second housing. The first end of the third housing and the first end of the first housing face the same side of the atomizing spray gun. The end of the water slurry spray gun provided with the slurry outlet passes through the first end of the third housing.

[0012] Further, the atomizing spray gun further includes: an igniter provided in the first installation cavity. The ignition end of the igniter protrudes from the first end of the first housing.

[0013] According to another aspect of the present utility model, a water coal slurry atomizing combustion system is provided, which includes: the above-mentioned atomizing spray gun; a combustion furnace provided with an installation port and a furnace chamber that are interconnected. The first end of the first housing passes through the installation port and is disposed in the furnace chamber. The flue gas inlet is located in the furnace chamber. The flue gas suction structure of the atomizing spray gun sucks the flue gas in the furnace chamber into the combustion-supporting gas passage through the flue gas inlet to preheat the combustion-supporting gas.

[0014] Further, the water coal slurry atomizing combustion system further includes: a first connecting pipe communicated with the combustion-supporting gas passage; a first valve disposed on the first connecting pipe, and the first valve is used to adjust the flow rate in the first connecting pipe; a second connecting pipe communicated with the slurry inlet; a second valve disposed on the second connecting pipe, and the second valve is used to adjust the flow rate in the second connecting pipe; a detector disposed in the furnace chamber, and the detector is used to detect the environmental parameters in the furnace chamber; a control system, and the detector, the first valve and the second valve are respectively electrically connected to the control system.

[0015] Applying the technical solution of the present utility model, the first end of the first housing is passed through the furnace chamber of the combustion furnace, so that the flue gas inlet is located in the furnace chamber. During the combustion process of the water coal slurry, the temperature in the furnace chamber is about one thousand degrees Celsius. When operating at low load, it may be necessary to use an ignition device for ignition. The setting of the flue gas inlet and the gas suction structure can suck the high-temperature flue gas in the furnace chamber into the combustion-supporting gas passage. The high-temperature flue gas mixes with the combustion-supporting gas in the combustion-supporting gas passage, achieving the effect of preheating the combustion-supporting gas, accelerating the start-up process of combustion, shortening the time for the system to reach a stable working state, and moreover, the preheated combustion-supporting gas helps to maintain the stability of the combustion process, reducing the consumption of auxiliary fuel required due to unstable combustion, thereby reducing the overall operating cost. By optimizing the combustion process, the pollutant emissions generated by incomplete combustion are reduced, improving the environmental friendliness. In the traditional technical solution, it is necessary to set an additional preheating device to heat the combustion-supporting gas, which has a high cost and is relatively cumbersome to operate. Through this solution, during the operation of the system, the combustion-supporting gas is effectively preheated and can reach a stable combustion state faster when igniting at low load operation. Compared with the existing technical solution, this solution directly preheats the combustion-supporting gas by using the high-temperature flue gas in the furnace chamber, eliminating the need for additional preheating equipment, reducing the overall cost of the system, and the high-temperature flue gas is effectively utilized and directly participates in the preheating of the combustion-supporting gas, improving the thermal efficiency of the system. Description of the Drawings

[0016] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0017] Figure 1The structural schematic diagram of the water coal slurry atomization combustion system provided by the embodiment of the present utility model is shown;

[0018] Figure 2 The partial structural cross-sectional view of the atomizing spray gun provided by the embodiment of the present utility model is shown;

[0019] Figure 3 Shown is Figure 2 The partial structural schematic diagram at position A in

[0020] Among them, the above-mentioned drawings include the following reference numerals:

[0021] 10, the first housing; 101, the first opening; 102, the flue gas inlet;

[0022] 103, the first combustion-supporting gas channel;

[0023] 1031, the first connecting section; 1032, the second connecting section; 1033, the third connecting section;

[0024] 104, the second combustion-supporting gas channel;

[0025] 20, the water coal slurry spray gun; 201, the slurry channel; 202, the slurry outlet;

[0026] 30, the second housing; 301, the second opening;

[0027] 40, the bump; 401, the guiding inclined surface;

[0028] 50, the cyclone assembly;

[0029] 60, the third housing; 601, the third opening;

[0030] 70, the igniter;

[0031] 80, the combustion furnace; 801, the installation opening; 802, the furnace chamber;

[0032] 90, the detector. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way restricts the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0034] As Figures 1 to 3As shown, the embodiment of the utility model provides an atomizing spray gun, which includes a first shell 10, a water-coal slurry spray gun 20 and a gas suction and rolling structure. Among them, the first shell 10 has a first installation cavity, a first opening 101 and a smoke inlet 102, the first opening 101 and the smoke inlet 102 are respectively connected to the first installation cavity, the first opening 101 is arranged on the end surface of the first end of the first shell 10, and the smoke inlet 102 is arranged on the side wall of the first shell 10. The water-coal slurry spray gun 20 is arranged in the first shell 10, and a combustion-supporting gas channel is formed between the water-coal slurry spray gun 20 and the first shell 10, and the combustion-supporting gas channel is connected to the smoke inlet 102. The water-coal slurry spray gun 20 has a slurry channel 201, a slurry inlet and a slurry outlet 202, the slurry inlet and the slurry outlet 202 are respectively connected to the slurry channel 201, and the slurry outlet 202 is arranged at the first end of the water-coal slurry spray gun 20, and the first end of the water-coal slurry spray gun 20 passes through the first end of the first shell 10. The gas suction structure is arranged in the first installation cavity, and is arranged close to the smoke inlet 102. During the circulation of the combustion-supporting gas, the gas outside the first shell 10 is sucked into the first shell 10 through the gas suction structure.

[0035] By applying the technical solution of the utility model, the first end of the first shell 10 is inserted into the furnace 802 of the combustion furnace 80, so that the flue gas inlet 102 is located in the furnace 802. During the combustion of the water-coal slurry, the temperature in the furnace 802 is about one thousand degrees Celsius. When operating at low load, there may be a situation where an ignition device needs to be used for ignition. The arrangement of the flue gas inlet 102 and the gas suction and roll structure can suck the high-temperature flue gas in the furnace 802 into the combustion-supporting gas channel, and the high-temperature flue gas is mixed with the combustion-supporting gas in the combustion-supporting gas channel. The above arrangement achieves the effect of preheating the combustion-supporting gas, speeds up the combustion startup process, shortens the time for the system to reach a stable working state, and the preheated combustion-supporting gas helps to maintain the stability of the combustion process, reduces the auxiliary fuel consumption required due to unstable combustion, thereby reducing the overall operating cost, and by optimizing the combustion process, reduces the pollutant emissions generated by incomplete combustion, and improves environmental friendliness. In the traditional technical solution, it is necessary to heat the combustion-supporting gas by setting an additional preheating device, which is costly and cumbersome to operate. Through this solution, the combustion-supporting gas is effectively preheated during the operation of the system, and a stable combustion state can be reached more quickly during ignition at low load. Compared with the prior art solution, this solution directly preheats the combustion-supporting gas by using the high-temperature flue gas in the furnace 802, eliminating the need for additional preheating equipment and reducing the overall cost of the system. In addition, the high-temperature flue gas is effectively utilized to directly participate in the preheating of the combustion-supporting gas, thereby improving the thermal efficiency of the system.

[0036] Further, the atomizing spray gun further includes a second housing 30. The second housing 30 has a second installation cavity and a second opening 301. The second opening 301 communicates with the second installation cavity. The second opening 301 is provided on the end face of the first end of the second housing 30. The water coal slurry spray gun 20, the second housing 30, and the first housing 10 are sleeved in sequence from inside to outside. The first end of the second housing 30 is disposed close to the first end of the first housing 10. The second housing 30 divides the combustion-supporting gas passage into an independent first combustion-supporting gas passage 103 and a second combustion-supporting gas passage 104. The first combustion-supporting gas passage 103 is located outside the second combustion-supporting gas passage 104. The first combustion-supporting gas passage 103 includes a first communication section 1031, a second communication section 1032, and a third communication section 1033 that are sequentially communicated along the flow direction of the combustion-supporting gas. The flow areas of the first communication section 1031 and the third communication section 1033 are respectively larger than the flow area of the second communication section 1032. The flue gas inlet 102 is provided on the side wall of the second communication section 1032. The first communication section 1031, the second communication section 1032, and the third communication section 1033 form a gas suction structure. During the process of the combustion-supporting gas flowing in the first combustion-supporting gas passage 103, under the combined action of the first communication section 1031, the second communication section 1032, and the third communication section 1033, a passage with a contraction section is formed in the flue gas suction structure. The passage of the contraction section is disposed opposite to the flue gas inlet 102. Due to the effect of the contraction section, the flow rate of the fluid gradually increases. The increase in the flow rate leads to a local pressure reduction, and then the high-temperature flue gas in the furnace 802 is suctioned into the first combustion-supporting gas passage 103. The high-temperature flue gas is mixed with the combustion-supporting gas in the first combustion-supporting gas passage 103. The high-temperature combustion-supporting gas heats the combustion-supporting gas at room temperature. With such a setting, the entrainment of the gas is realized by using the pressure and momentum of the fluid itself, reducing the additional energy consumption.

[0037] In an embodiment of the present solution, along the extending direction of the second housing 30, the distance between the outer side wall of the second housing 30 and the inner side wall of the first housing 10 is the same. The atomizing spray gun further includes a convex block 40. The convex block 40 is provided on the outer side wall of the second housing 30. The flue gas inlet 102 is disposed opposite to the convex block 40. There is a distance between the convex block 40 and the flue gas inlet 102. Along the axial direction of the flue gas inlet 102, the projection of the flue gas inlet 102 is located on the convex block 40. The setting of the convex block 40 can realize the formation of the first communication section 1031, the second communication section 1032, and the third communication section 1033. Moreover, the setting of the convex block 40 has a simple structure and is convenient for realizing the assembly with the second housing 30.

[0038] Wherein, the convex block 40 can be assembled with the second housing 30 as a separate component, or integrally formed as a part of the second housing 30, providing flexibility and convenience for assembly.

[0039] Furthermore, the bump 40 has a diversion inclined surface 401, which is located on the side of the flue gas inlet 102 close to the first combustion-supporting gas inlet. Along the direction from the first combustion-supporting gas inlet to the flue gas inlet 102, the distance between the diversion inclined surface 401 and the outer side wall of the second housing 30 gradually increases. The design of the diversion inclined surface 401 helps to guide the smooth transition of the fluid, reducing turbulence and pressure loss. Moreover, the design of the diversion inclined surface 401 makes the flow area of the first communication section 1031 gradually increase towards the direction close to the second communication section 1032. With such a setting, the suction effect on the flue gas can be further improved.

[0040] In the embodiment of this solution, the first end of the second housing 30 is located inside the first housing 10, and there is a distance between the end face of the first end of the second housing 30 and the end face of the first end of the first housing 10. With such a setting, a mixing space can be provided for the combustion-supporting gas and the high-temperature flue gas, improving the mixing effect of the high-temperature flue gas and the combustion-supporting gas and the preheating effect on the combustion-supporting gas.

[0041] Furthermore, the atomizing spray gun further includes a swirler assembly 50. The swirler assembly 50 includes swirler vanes and a mounting sleeve. The mounting sleeve is located in the second combustion-supporting gas passage 104 and sleeved on the outer periphery of the water coal slurry spray gun 20. A plurality of swirler vanes are provided, and the plurality of swirler vanes are circumferentially and annularly spaced on the outer side wall of the mounting sleeve. When the combustion-supporting gas passes through the swirler vanes in the mounting cavity, the swirler vanes cause the gas to generate a rotational motion, forming a stable swirling flow field. The swirling flow field generated by the swirler vanes helps to improve the flow efficiency of the combustion-supporting gas inside the spray gun, reduce the flow resistance, ensure the uniform and efficient flow of the gas, improve the mixing effect of the high-temperature flue gas and the combustion-supporting gas, and also improve the mixing effect of the combustion-supporting gas and the water coal slurry, enhancing the combustion stability.

[0042] Furthermore, a plurality of flue gas inlets 102 are provided, and the plurality of flue gas inlets 102 are circumferentially distributed along the first housing 10 and / or axially spaced along the first housing 10. With such a setting, the suction effect on the high-temperature flue gas can be further improved, and the preheating effect of the high-temperature flue gas on the combustion-supporting gas can be enhanced.

[0043] In an embodiment of this solution, the atomizing spray gun further includes a third housing 60. The third housing 60 has a third installation cavity and a third opening 601 that communicate with each other. The third opening 601 is provided on the end face of the first end of the third housing 60. The third housing 60 is disposed through the second housing 30. The first end of the third housing 60 and the first end of the first housing 10 face the same side of the atomizing spray gun. One end of the water coal slurry spray gun 20 provided with the slurry outlet 202 passes out from the first end of the third housing 60. The setting of the third housing 60 can provide stable support for the water coal slurry spray gun 20, reduce the vibration and swing of the spray gun during use, and improve the stability of the water coal slurry spray gun 20.

[0044] Specifically, the mounting sleeve is sleeved on the outer periphery of the third housing 60. With this setting, the third housing 60 provides support for the mounting sleeve, improving the convenience of mounting the mounting sleeve.

[0045] In an embodiment of this solution, the mounting sleeve is detachably connected to the third housing 60. With this setting, it is convenient to assemble the mounting sleeve and the third housing 60, and it is also convenient to replace the cyclone assembly 50 of different sizes and specifications.

[0046] This solution does not limit the specific connection method between the mounting sleeve and the third housing 60. Among them, it can be fixed by fasteners, snap connection or plug connection.

[0047] In an embodiment of this solution, a positioning structure can also be provided. The positioning structure is disposed between the third housing 60 and the water coal slurry spray gun 20, and the positioning structure is used to limit the relative position between the water coal slurry spray gun 20 and the third housing 60. With this setting, the position accuracy of the water coal slurry spray gun 20 can be further improved.

[0048] Furthermore, the atomizing spray gun further includes an igniter 70. The igniter 70 is disposed in the first installation cavity, and the ignition end of the igniter 70 protrudes from the first end of the first housing 10. This solution does not limit the specific form of the igniter 70. In an embodiment of this solution, the igniter 70 includes a plasma igniter. Compared with the traditional oil gun ignition or gas ignition method, the plasma igniter can achieve oil-free start and stable combustion at low load, reduce the dependence on fuel, and reduce the operating cost.

[0049] An embodiment of the present utility model also provides a water coal slurry atomizing combustion system, which includes a combustion furnace and the above-mentioned atomizing spray gun. The combustion furnace 80 is provided with an installation port 801 and a furnace chamber 802 that communicate with each other. The first end of the first housing 10 passes through the installation port 801 and is disposed in the furnace chamber 802. The flue gas inlet 102 is located in the furnace chamber 802. The flue gas suction structure of the atomizing spray gun sucks the flue gas in the furnace chamber 802 into the combustion-supporting gas passage through the flue gas inlet 102 to preheat the combustion-supporting gas.

[0050] Furthermore, the water coal slurry atomization combustion system further includes a first connecting pipe, a first valve, a second connecting pipe, a second valve, a third connecting pipe, a third valve, a detector 90 and a control system.

[0051] Among them, the first connecting pipe is communicated with the first combustion-supporting gas channel 103, the first valve is arranged on the first connecting pipe, and the first valve is used to adjust the flow rate in the first connecting pipe; the second connecting pipe is communicated with the slurry inlet, the second valve is arranged on the second connecting pipe, and the second valve is used to adjust the flow rate in the second connecting pipe; the third connecting pipe is communicated with the second combustion-supporting gas channel 104, the third valve is arranged on the third connecting pipe, and the third valve is used to adjust the flow rate in the third connecting pipe; the detector 90 includes at least one of a pressure sensor, a temperature sensor, and a flue gas component detector, the detector 90 is arranged in the furnace 802, and the detector 90 is used to detect the environmental parameters in the furnace 802; the control system, the detector 90, the first valve, the second valve, and the third valve are respectively electrically connected to the control system. The above settings can improve the degree of automatic control of the system, adjust the control parameters in real time according to the combustion process, and improve the combustion efficiency.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0054] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0055] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation other than the orientation described in the drawings for the device. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0056] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without separate declaration, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0057] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An atomizing spray gun, characterized in that: The atomizing spray gun comprises: A first shell (10) having a first installation cavity, a first opening (101) and a smoke inlet (102), wherein the first opening (101) and the smoke inlet (102) are respectively connected to the first installation cavity, the first opening (101) is arranged on an end surface of a first end of the first shell (10), and the smoke inlet (102) is arranged on a side wall of the first shell (10); A coal-water slurry spray gun (20) is disposed in the first shell (10), a combustion-supporting gas channel is formed between the coal-water slurry spray gun (20) and the first shell (10), the combustion-supporting gas channel is communicated with the flue gas inlet (102), the coal-water slurry spray gun (20) has a slurry channel (201), a slurry inlet and a slurry outlet (202), the slurry inlet and the slurry outlet (202) are respectively communicated with the slurry channel (201), the slurry outlet (202) is arranged at the first end of the coal-water slurry spray gun (20), and the first end of the coal-water slurry spray gun (20) passes through the first end of the first shell (10); A gas suction structure is arranged in the first installation cavity. The gas suction structure is arranged close to the smoke inlet (102). During the circulation of the combustion-supporting gas, the gas outside the first shell (10) is sucked into the first shell (10) through the gas suction structure.

2. The atomizing spray gun according to claim 1, characterized in that: The atomizing spray gun also includes: The second shell (30) has a second installation cavity and a second opening (301), the second opening (301) is communicated with the second installation cavity, the second opening (301) is arranged on the end surface of the first end of the second shell (30), the water-coal slurry spray gun (20), the second shell (30) and the first shell (10) are sequentially arranged from the inside to the outside, the first end of the second shell (30) is arranged close to the first end of the first shell (10), the second shell (30) divides the combustion-supporting gas channel into a first combustion-supporting gas channel (103) and a second combustion-supporting gas channel (104) which are independent of each other, the first combustion-supporting gas channel (103) is located in the On the outer side of the second combustion-supporting gas channel (104), the first combustion-supporting gas channel (103) includes a first connecting section (1031), a second connecting section (1032) and a third connecting section (1033) which are connected in sequence along the flow direction of the combustion-supporting gas, the flow area of ​​the first connecting section (1031) and the flow area of ​​the third connecting section (1033) are respectively larger than the flow area of ​​the second connecting section (1032), the smoke inlet (102) is arranged on the side wall of the second connecting section (1032), and the first connecting section (1031), the second connecting section (1032) and the third connecting section (1033) form the gas suction structure.

3. The atomizing spray gun according to claim 2, characterized in that: Along the extension direction of the second shell (30), the distance between the outer side wall of the second shell (30) and the inner side wall of the first shell (10) is the same, and the atomizing spray gun further comprises: A protrusion (40) is arranged on the outer wall of the second shell (30); the smoke inlet (102) and the protrusion (40) are arranged opposite to each other; there is a distance between the protrusion (40) and the smoke inlet (102); along the axial direction of the smoke inlet (102), the projection of the smoke inlet (102) is located on the protrusion (40).

4. The atomizing spray gun according to claim 3, characterized in that: The protrusion (40) has a guide slope (401), and the guide slope (401) is located on a side of the flue gas inlet (102) close to the first combustion-supporting gas inlet. Along the direction from the first combustion-supporting gas inlet to the flue gas inlet (102), the distance between the guide slope (401) and the outer side wall of the second shell (30) gradually increases.

5. The atomizing spray gun according to claim 1, characterized in that: The atomizing spray gun also includes: A cyclone assembly (50), the cyclone assembly (50) comprising a cyclone blade and a mounting sleeve, the mounting sleeve being arranged on the outer periphery of the water-coal slurry spray gun (20), a plurality of cyclone blades being arranged on the outer side wall of the mounting sleeve at annular intervals along the circumference of the mounting sleeve.

6. The atomizing spray gun according to claim 1, characterized in that: A plurality of the smoke inlets (102) are provided, and the plurality of the smoke inlets (102) are arranged along the circumference of the first shell (10), and / or the plurality of the smoke inlets (102) are distributed at intervals along the axial direction of the first shell (10).

7. The atomizing spray gun according to claim 2, characterized in that: The atomizing spray gun also includes: The third shell (60) has a third installation cavity and a third opening (601) which are interconnected. The third opening (601) is arranged on the end surface of the first end of the third shell (60). The third shell (60) is inserted into the second shell (30). The first end of the third shell (60) and the first end of the first shell (10) face the same side of the atomizing spray gun. One end of the water-coal slurry spray gun (20) provided with a slurry outlet (202) passes through the first end of the third shell (60).

8. The atomizing spray gun according to claim 1, characterized in that: The atomizing spray gun also includes: An igniter (70) is disposed in the first mounting cavity, and an ignition end of the igniter (70) protrudes from the first end of the first housing (10).

9. A water-coal slurry atomizing combustion system, characterized in that: include: The atomizing spray gun according to any one of claims 1 to 8; The combustion furnace (80) is provided with an installation opening (801) and a furnace (802) which are interconnected. The first end of the first shell (10) is inserted into the furnace (802) through the installation opening (801). The smoke inlet (102) is located in the furnace (802). The smoke suction structure of the atomizing spray gun sucks the smoke in the furnace (802) into the combustion-supporting gas channel through the smoke inlet (102) to preheat the combustion-supporting gas.

10. The water-coal slurry atomizing combustion system according to claim 9, characterized in that: The water-coal slurry atomizing combustion system also includes: A first connecting pipe, connected to the combustion-supporting gas channel; a first valve, disposed on the first connecting pipe, the first valve being used to adjust the flow in the first connecting pipe; a second connecting pipe, connected to the slurry inlet; a second valve, disposed on the second connecting pipe, the second valve being used to adjust the flow of the second connecting pipe; A detector (90) is disposed in the furnace (802), and the detector (90) is used to detect environmental parameters in the furnace (802); A control system, wherein the detector (90), the first valve and the second valve are electrically connected to the control system respectively.

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