A boiler explosion soot blowing technology with ejector inert gas for fire retardancy

Abstract

The present invention discloses a boiler explosion soot blowing technology with ejector inert gas flame retardancy, which includes an oxygen gas cylinder, an acetylene gas cylinder, a nitrogen gas cylinder, a Venturi ejector, a combustion explosion device, a solenoid valve, an elbow, a three-way joint, a circular straight pipe, a circular connecting pipe, bolts and nuts. The present invention utilizes the airflow generated by the explosion of oxygen and acetylene in the combustion explosion device to eject the inert gas nitrogen when passing through the Venturi ejector in the reverse direction, weakening the impact of the explosion on the gas transmission pipeline and the solenoid valve. Moreover, nitrogen can block the backfire surface generated by the explosion, prevent the combustion backfire surface from extending towards the gas cylinder and the solenoid valve, prolong the service life of the equipment, and improve the safety of the explosion soot blowing system.

Description

Technical Field

[0001] The present invention relates to the technical field of Venturi, and particularly to a boiler explosion soot blowing technology for ejecting inert gas for flame retardance. Background Art

[0002] Venturi is involved in many fields, including military, energy, agriculture, materials, chemical industry, etc., and can generate a local low-pressure area, with high utilization value. The principle of the Venturi tube is that when the fluid flows through the converging section to the throat, the cross-sectional area of the flow passage suddenly decreases, the fluid velocity increases and the pressure decreases, forming a stable low-pressure area, thus bringing about a low-pressure effect and having high industrial application value.

[0003] As a common boiler soot blowing technology, boiler explosion soot blowing mixes combustible gas and combustion-supporting gas in a certain proportion, ignites in the combustion chamber for gas combustion explosion, and uses the gas shock wave and sound wave generated by the gas explosion to remove the ash deposited on the boiler heating surface. However, since the shock wave generated by the explosion will also impact the pipelines for transporting combustible gas and combustion-supporting gas, and the combustion surface may move forward along the gas supply pipeline, causing the combustion-supporting gas and combustible gas in the pipeline to burn, impacting the gas supply pipeline and even causing damage, reducing the service life of the gas supply pipeline and the equipment on the gas supply pipeline. Therefore, a boiler explosion soot blowing technology for ejecting inert gas for flame retardance has become one of the urgent needs in this field. Summary of the Invention

[0004] The main technical problem to be solved by the present invention is to provide a boiler explosion soot blowing technology for ejecting inert gas for flame retardance, which can effectively slow down the impact of the pressure wave generated by the explosion on the pipeline and timely block the backfire generated by the explosion from extending to the solenoid valve and the gas cylinder.

[0005] To solve the above technical problem, one technical solution adopted by the present invention is:

[0006] A boiler explosion soot blowing technology for ejecting inert gas for flame retardance mainly includes an oxygen gas cylinder a1, an acetylene gas cylinder b2, a nitrogen gas cylinder c3, a Venturi ejector 4, a combustion explosion device 5, a solenoid valve a6, a solenoid valve b7, a solenoid valve c8, an elbow a9, an elbow b10, an elbow c11, a three-way joint 12, a circular straight pipe a13, a circular straight pipe b14, a circular straight pipe c15, a circular straight pipe d16, a circular straight pipe e17, a circular straight pipe f18, a circular straight pipe g19, a circular straight pipe h20, a circular straight pipe i21, a circular straight pipe j22, a circular connecting pipe k23, a bolt a24, a bolt b25, a bolt c26, a bolt d27, a nut a28, a nut b29, a nut c30, and a nut d31.

[0007] The oxygen gas cylinder a1 is provided with an internal thread a32; the acetylene gas cylinder b2 is provided with an internal thread b33; the nitrogen gas cylinder c3 is provided with an internal thread c34; the Venturi ejector 4 is provided with a converging section 41, a throat section 42, a diverging section 43, an injection hole 44, an extended connection section a45, an extended connection section b46, an internal thread d47, an internal thread e48, and an internal thread f49; the combustion and explosion device 5 is provided with a connection flange a51, a mixed gas inlet section 52, an igniter 53, a combustion chamber 54, an outlet soot blowing section 55, a circular through hole a56, a circular through hole b57, a circular through hole c58, and a circular through hole d59; the solenoid valve a6 is provided with an electromagnetic controller a61, an internal thread g62, and an internal thread h63; the solenoid valve b7 is provided with an electromagnetic controller b71, an internal thread i72, and an internal thread j73; the solenoid valve c8 is provided with an electromagnetic controller c81, an internal thread k82, and an internal thread L83; the elbow a9 is provided with an internal thread m91 and an internal thread n92; the elbow b10 is provided with an internal thread o101 and an internal thread p102; the elbow c11 is provided with an internal thread q111 and an internal thread r112; the three-way joint 12 is provided with an internal thread s121, an internal thread t122, and an internal thread u123; the circular straight pipe a13 is provided with an external thread a131 and an external thread b132; the circular straight pipe b14 is provided with an external thread c141 and an external thread d142; the circular straight pipe c15 is provided with an external thread e151 and an external thread f152; the circular straight pipe d16 is provided with an external thread g161 and an external thread h162; the circular straight pipe e17 is provided with an external thread i171 and an external thread j172; the circular straight pipe f18 is provided with an external thread k181 and an external thread l182; the circular straight pipe g19 is provided with an external thread m191 and an external thread n192; the circular straight pipe h20 is provided with an external thread o201 and an external thread p202; the circular straight pipe i21 is provided with an external thread q211 and an external thread r212; the circular straight pipe j22 is provided with an external thread s221 and an external thread t222; the circular connecting pipe k23 is provided with an external thread u231, a circular pipe section 232, a connection flange b233, a circular through hole e234, a circular through hole f235, a circular through hole g236, and a circular through hole h237.

[0008] The oxygen gas cylinder a1 is sequentially connected to the inner thread s121 of the circular straight pipe c15, the solenoid valve c8, the circular straight pipe e17, the elbow c11, the circular straight pipe g19, and the three-way joint 12; the acetylene gas cylinder b2 is sequentially connected to the inner thread t122 of the circular straight pipe b14, the solenoid valve b7, the circular straight pipe d16, the elbow b10, the circular straight pipe f18, and the three-way joint 12; the inner thread u123 of the three-way joint 12 is sequentially connected to the inner thread d47 of the circular straight pipe h20 and the Venturi injector 4; the nitrogen gas cylinder c3 is sequentially connected to the inner thread e48 of the circular straight pipe a13, the solenoid valve a6, the circular straight pipe i21, the elbow a9, the circular straight pipe j22, and the Venturi injector 4; the inner thread f49 of the Venturi injector 4 is sequentially connected to the circular connecting pipe k23 and the combustion and explosion device 5; a flange connection is adopted between the circular connecting pipe k23 and the combustion and explosion device 5. The bolt a24 passes through the circular through hole e234 and the circular through hole a56 and is matched with the nut a28. The bolt b25 passes through the circular through hole f235 and the circular through hole b57 and is matched with the nut b29. The bolt c26 passes through the circular through hole g236 and the circular through hole c58 and is matched with the nut c30. The bolt d27 passes through the circular through hole h237 and the circular through hole d59 and is matched with the nut d31; other connections in the pipeline are all thread connections, and the overall constitutes a soot blowing and flame retardant system.

[0009] The converging section 41 on the Venturi injector 4 is a hollow conical cylinder with an outer diameter of 40 mm, an inner diameter gradually shrinking from 30 mm to 15 mm, and a length of 60 mm; the throat section 42 is a hollow cylinder with an inner diameter of 15 mm, an outer diameter of 30 mm, and a length of 120 mm; the diverging section 43 is a hollow conical cylinder with an outer diameter of 40 mm, an inner diameter gradually expanding from 15 mm to 30 mm, and a length of 60 mm; the extended connecting section a45 is a hollow cylinder with an inner diameter of 30 mm, an outer diameter of 40 mm, and a length of 30 mm. At the port of the extended connecting section a45, there is an inner thread d47 with a length of 25 mm; the extended connecting section b46 is a hollow cylinder with an inner diameter of 30 mm, an outer diameter of 40 mm, and a length of 30 mm. At the port of the extended connecting section b46, there is an inner thread f49 with a length of 25 mm; the injection hole 44 is arranged at the middle position of the throat section 42, with an inner diameter of 30 mm and a depth of 30 mm. There is an inner thread e48 with a depth of 25 mm in the injection hole 44, and the axis of the injection hole 44 is perpendicular to the axis of the throat section 42; the axes of the extended connecting section a45, the converging section 41, the throat section 42, the diverging section 43, and the extended connecting section b46 are located on the same straight line.

[0010] The gas mixture inlet section 52 on the combustion and explosion device 5 is a hollow cylinder with an inner diameter of 30 mm, an outer diameter of 40 mm, and a length of 1000 mm; the connecting flange a51 is located at the front section of the gas mixture inlet section 52 and is a hollow disc with an inner diameter of 30 mm, an outer diameter of 140 mm, and a thickness of 25 mm; the circular through-holes a56, b57, c58, and d59 are all circular through-holes with a diameter of 20 mm, and the centers of the circles are all 50 mm away from the center point of the connecting flange a51. The circular through-holes a56, b57, c58, and d59 are evenly distributed along the circumferential direction of the connecting flange a51; the combustion chamber 54 is a cuboid-shaped shell with a height of 1200 mm, a bottom that is a square with a side length of 800 mm, and a shell thickness of 50 mm; the igniter 53 is located above the combustion chamber 54; the outlet soot blowing section 55 is a hollow cylinder with an inner diameter of 40 mm, an outer diameter of 50 mm, and a length of 3000 mm.

[0011] The circular pipe section 232 of the circular connecting pipe k23 is a hollow cylinder with an inner diameter of 25 mm, an outer diameter of 30 mm, and a length of 325 mm; the connecting flange b233 is located at one end of the circular pipe section 232 and is a hollow disc with an inner diameter of 30 mm, an outer diameter of 140 mm, and a thickness of 25 mm; the circular through-holes e234, f235, g236, and h237 are all circular through-holes with a diameter of 20 mm, and their centers are all 50 mm away from the center of the circle of the connecting flange b233 and are evenly distributed along the circumferential direction of the connecting flange b233; the external thread u231 is provided at the other port of the circular pipe section 232 with a length of 25 mm.

[0012] The inner diameters of the solenoid valve a6, solenoid valve b7, and solenoid valve c8 are all 30 mm, and internal threads are provided at both ports; the inner diameters of the elbow a9, elbow b10, and elbow c11 are 30 mm, and internal threads are provided at both ports; the three-way joint 12 is an equal-diameter T-shaped three-way, with an inner diameter of 30 mm. Internal threads s121 and t122 are respectively provided at both ports of the straight-through side, and an internal thread u123 is provided at the vertical side port; the circular straight pipes a13, b14, c15, d16, e17, f18, g19, h20, i21, and j22 are all hollow cylinders with an inner diameter of 25 mm and an outer diameter of 30 mm, and external threads are provided at both ends of the straight pipe; the bolts a24, b25, c26, and d27 are all M10 standard hexagonal bolts; the nuts a28, b29, c30, and d31 are all M10 standard round nuts; the oxygen gas cylinder a1, acetylene gas cylinder b2, and nitrogen gas cylinder c3 are all conventional gas cylinders.

[0013] When operating this explosion soot blower, first, open solenoid valve b7 and solenoid valve c8, and close solenoid valve a6, so that oxygen and acetylene enter the combustion chamber 54 through the mixed gas inlet section 52 according to a certain ratio until the acetylene in the combustion explosion device 5 reaches the explosion concentration range; then, sequentially close solenoid valve b7 and solenoid valve c8, open solenoid valve a6, and ignite the acetylene gas in the combustion chamber 54 through the igniter 53 above the combustion explosion device 5; then, most of the expansion gas generated after the explosion will be sprayed onto the outer wall surface of the boiler furnace through the outlet soot blowing section 55; another part of the gas flows back to the Venturi ejector 4. When the reflux gas passes through the converging section 41, the flow cross-section decreases, the flow velocity increases, and the pressure decreases. When the reflux gas enters the throat section 42, the gas flow velocity reaches the highest and the pressure drops to the lowest. The reflux gas will form a low-pressure area in the throat section 42, and nitrogen will be ejected through the ejection hole 44. When nitrogen enters the Venturi ejector 4, it will prevent the combustion surface generated during the explosion in the pipeline from continuing to extend towards the oxygen gas cylinder a1 and the acetylene gas cylinder b2. The reflux gas will mix with nitrogen and enter the diverging section 43. The velocity of the mixed gas decreases and the pressure rises, and finally enters the pipeline system; in addition, nitrogen is ejected into the pipeline, which can weaken the impact of the pressure wave of the gas explosion back transmission on the solenoid valves b7 and c8.

[0014] The beneficial effects of the present invention are:

[0015] When the air flow generated by the explosion of oxygen and acetylene in the combustion explosion device passes through the Venturi ejector in the reverse direction, the solenoid valve of the nitrogen pipeline is opened to eject the inert gas nitrogen, weakening the impact of the explosion on the gas transmission pipeline and the solenoid valve, and using nitrogen to block the explosion flashback, extending the service life of the equipment and improving the safety of the explosion soot blowing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the system assembly drawing of a boiler explosion soot blowing technology for ejecting inert gas for flame retardancy according to the present invention;

[0017] Figure 2 It is for a boiler explosion soot blowing technology for ejecting inert gas for flame retardancy according to the present invention Figure 1 The partial perspective view at A in it;

[0018] Figure 3 It is the three-dimensional view of the Venturi ejector of a boiler explosion soot blowing technology for ejecting inert gas for flame retardancy according to the present invention;

[0019] Figure 4 It is the three-dimensional view of the combustion explosion device of a boiler explosion soot blowing technology for ejecting inert gas for flame retardancy according to the present invention;

[0020] Figure 5 It is for a boiler explosion soot blowing technology for ejecting inert gas for flame retardancy according to the present invention Figure 4 The partial enlarged view at B in it;

[0021] Figure 6 Three-dimensional view of the circular connecting pipe of the boiler explosion soot blowing technology with ejector inert gas flame retardant for the present invention;

[0022] Figure 7 Three-dimensional view of the solenoid valve of the boiler explosion soot blowing technology with ejector inert gas flame retardant for the present invention;

[0023] Figure 8 Three-dimensional view of the elbow of the boiler explosion soot blowing technology with ejector inert gas flame retardant for the present invention;

[0024] Figure 9 Three-dimensional view of the tee joint of the boiler explosion soot blowing technology with ejector inert gas flame retardant for the present invention;

[0025] Figure 10 Three-dimensional view of a part of the circular pipe of the boiler explosion soot blowing technology with ejector inert gas flame retardant for the present invention;

[0026] Figure 11 Three-dimensional view of a part of the circular pipe of the boiler explosion soot blowing technology with ejector inert gas flame retardant for the present invention;

[0027] Figure 12 Three-dimensional view of a part of the circular pipe of the boiler explosion soot blowing technology with ejector inert gas flame retardant for the present invention;

[0028] Figure 13 Three-dimensional view of the bolt of the boiler explosion soot blowing technology with ejector inert gas flame retardant for the present invention;

[0029] Figure 14 Three-dimensional view of the nut of the boiler explosion soot blowing technology with ejector inert gas flame retardant for the present invention;

[0030] Figure 15 Three-dimensional view of the oxygen gas cylinder of the boiler explosion soot blowing technology with ejector inert gas flame retardant for the present invention. Detailed implementation manners

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0032] The present invention relates to a boiler explosion soot blowing technology with ejector inert gas flame retardancy, mainly including an oxygen gas cylinder a1, an acetylene gas cylinder b2, a nitrogen gas cylinder c3, a Venturi ejector 4, a combustion explosion device 5, a solenoid valve a6, a solenoid valve b7, a solenoid valve c8, an elbow a9, an elbow b10, an elbow c11, a tee joint 12, a circular straight pipe a13, a circular straight pipe b14, a circular straight pipe c15, a circular straight pipe d16, a circular straight pipe e17, a circular straight pipe f18, a circular straight pipe g19, a circular straight pipe h20, a circular straight pipe i21, a circular straight pipe j22, a circular connecting pipe k23, a bolt a24, a bolt b25, a bolt c26, a bolt d27, a nut a28, a nut b29, a nut c30, and a nut d31.

[0033] The oxygen gas cylinder a1 is provided with an internal thread a32; the acetylene gas cylinder b2 is provided with an internal thread b33; the nitrogen gas cylinder c3 is provided with an internal thread c34; the Venturi ejector 4 is provided with a converging section 41, a throat section 42, a diverging section 43, an ejection hole 44, an extended connection section a45, an extended connection section b46, an internal thread d47, an internal thread e48, and an internal thread f49; the combustion explosion device 5 is provided with a connection flange a51, a mixed gas inlet section 52, an igniter 53, a combustion chamber 54, an outlet soot blowing section 55, a circular through hole a56, a circular through hole b57, a circular through hole c58, and a circular through hole d59; the solenoid valve a6 is provided with an electromagnetic controller a61, an internal thread g62, and an internal thread h63; the solenoid valve b7 is provided with an electromagnetic controller b71, an internal thread i72, and an internal thread j73; the solenoid valve c8 is provided with an electromagnetic controller c81, an internal thread k82, and an internal thread L83; the elbow a9 is provided with an internal thread m91 and an internal thread n92; the elbow b10 is provided with an internal thread o101 and an internal thread p102; the elbow c11 is provided with an internal thread q111 and an internal thread r112; the tee joint 12 is provided with an internal thread s121, an internal thread t122, and an internal thread u123; the circular straight pipe a13 is provided with an external thread a131 and an external thread b132; the circular straight pipe b14 is provided with an external thread c141 and an external thread d142; the circular straight pipe c15 is provided with an external thread e151 and an external thread f152; the circular straight pipe d16 is provided with an external thread g161 and an external thread h162; the circular straight pipe e17 is provided with an external thread i171 and an external thread j172; the circular straight pipe f18 is provided with an external thread k181 and an external thread l182; the circular straight pipe g19 is provided with an external thread m191 and an external thread n192; the circular straight pipe h20 is provided with an external thread o201 and an external thread p202; the circular straight pipe i21 is provided with an external thread q211 and an external thread r212; the circular straight pipe j22 is provided with an external thread s221 and an external thread t222; the circular connecting pipe k23 is provided with an external thread u231, a circular pipe section 232, a connection flange b233, a circular through hole e234, a circular through hole f235, a circular through hole g236, and a circular through hole h237.

[0034] As a preferred embodiment of the present invention, as Figure 1 and Figure 2 shown, the oxygen gas cylinder a1 is sequentially connected to the inner thread s121 of the circular straight pipe c15, the solenoid valve c8, the circular straight pipe e17, the elbow c11, the circular straight pipe g19, and the three-way joint 12; the acetylene gas cylinder b2 is sequentially connected to the inner thread t122 of the circular straight pipe b14, the solenoid valve b7, the circular straight pipe d16, the elbow b10, the circular straight pipe f18, and the three-way joint 12; the inner thread u123 of the three-way joint 12 is sequentially connected to the inner thread d47 of the circular straight pipe h20 and the Venturi injector 4; the nitrogen gas cylinder c3 is sequentially connected to the inner thread e48 of the circular straight pipe a13, the solenoid valve a6, the circular straight pipe i21, the elbow a9, the circular straight pipe j22, and the Venturi injector 4; the inner thread f49 of the Venturi injector 4 is sequentially connected to the circular connecting pipe k23 and the combustion and explosion device 5; a flange connection is adopted between the circular connecting pipe k23 and the combustion and explosion device 5. The bolt a24 passes through the circular through-hole e234 and the circular through-hole a56 and is matched with the nut a28. The bolt b25 passes through the circular through-hole f235 and the circular through-hole b57 and is matched with the nut b29. The bolt c26 passes through the circular through-hole g236 and the circular through-hole c58 and is matched with the nut c30. The bolt d27 passes through the circular through-hole h237 and the circular through-hole d59 and is matched with the nut d31. Other connections in the pipeline are all threaded connections, and the overall constitutes a soot blowing and flame retardant system.

[0035] As Figure 3 shown, the tapered section 41 on the Venturi injector 4 is a hollow conical cylinder with an outer diameter of 40 mm, an inner diameter gradually decreasing from 30 mm to 15 mm, and a length of 60 mm; the throat section 42 is a hollow cylinder with an inner diameter of 15 mm, an outer diameter of 30 mm, and a length of 120 mm; the divergent section 43 is a hollow conical cylinder with an outer diameter of 40 mm, an inner diameter gradually increasing from 15 mm to 30 mm, and a length of 60 mm; the extended connection section a45 is a hollow cylinder with an inner diameter of 30 mm, an outer diameter of 40 mm, and a length of 30 mm. At the port of the extended connection section a45, there is an inner thread d47 with a length of 25 mm; the extended connection section b46 is a hollow cylinder with an inner diameter of 30 mm, an outer diameter of 40 mm, and a length of 30 mm. At the port of the extended connection section b46, there is an inner thread f49 with a length of 25 mm; the injection hole 44 is arranged at the middle position of the throat section 42, with an inner diameter of 30 mm and a depth of 30 mm. The injection hole 44 is provided with an inner thread e48 with a depth of 25 mm, and the axis of the injection hole 44 is perpendicular to the axis of the throat section 42; the axes of the extended connection section a45, the tapered section 41, the throat section 42, the divergent section 43, and the extended connection section b46 are located on the same straight line.

[0036] As Figure 4 and Figure 5As shown in the figure, the mixed gas inlet section 52 on the combustion and explosion device 5 is a hollow cylinder with an inner diameter of 30 mm, an outer diameter of 40 mm, and a length of 1000 mm; the connecting flange a51 is located at the front section of the mixed gas inlet section 52 and is a hollow disc with an inner diameter of 30 mm, an outer diameter of 140 mm, and a thickness of 25 mm; the circular through holes a56, b57, c58, and d59 are all circular through holes with a diameter of 20 mm, and the center distance of their centers from the center point of the connecting flange a51 is 50 mm. The circular through holes a56, b57, c58, and d59 are evenly distributed along the circumferential direction of the connecting flange a51; the combustion chamber 54 is a cuboid-shaped shell with a height of 1200 mm, a bottom that is a square with a side length of 800 mm, and a shell thickness of 50 mm; the igniter 53 is located above the combustion chamber 54; the outlet soot blowing section 55 is a hollow cylinder with an inner diameter of 40 mm, an outer diameter of 50 mm, and a length of 3000 mm.

[0037] As Figure 6 shown, the circular tube section 232 of the circular connecting tube k23 is a hollow cylinder with an inner diameter of 25 mm, an outer diameter of 30 mm, and a length of 325 mm; the connecting flange b233 is located at one end of the circular tube section 232 and is a hollow disc with an inner diameter of 30 mm, an outer diameter of 140 mm, and a thickness of 25 mm; the circular through holes e234, f235, g236, and h237 are all circular through holes with a diameter of 20 mm, and the center of each of them is 50 mm away from the center of the connecting flange b233 and is evenly distributed along the circumferential direction of the connecting flange b233; the external thread u231 is provided at the other port of the circular tube section 232 with a length of 25 mm.

[0038] As Figure 7 shown, the inner diameters of the solenoid valves a6, b7, and c8 are all 30 mm, and internal threads are provided at both ports with a length of 25 mm; as Figure 8 shown, the inner diameters of the elbows a9, b10, and c11 are 30 mm, and internal threads are provided at both ports with a length of 25 mm; as Figure 9 shown, the tee joint 12 is an equal-diameter T-shaped tee, and the inner diameters are all 30 mm. Internal threads s121 and t122 are respectively provided at both ports of the straight-through side, and an internal thread u123 is provided at the vertical side port, and the length of the internal threads is all 25 mm.

[0039] The circular straight pipes a13, b14, c15, d16, e17, f18, g19, h20, i21, and j22 are all hollow cylinders with an inner diameter of 25 mm and an outer diameter of 30 mm, and external threads are provided at both ends of the straight pipes. Among them, as Figure 10As shown, the lengths of the circular straight pipes a13, b14, c15, f18 and g19 are 380 mm; as Figure 11 shown, the lengths of the circular straight pipes d16 and e17 are 800 mm, and the length of the circular straight pipe h20 is 1000 mm; as Figure 12 shown, the length of the circular straight pipe i21 is 2265 mm, and the length of the circular straight pipe j22 is 1150 mm; as Figure 13 shown, the bolts a24, b25, c26 and d27 are all M10 standard hexagonal bolts; as Figure 14 shown, the nuts a28, b29, c30 and d31 are all M10 standard round nuts; as Figure 15 shown, the oxygen gas cylinder a1, the acetylene gas cylinder b2 and the nitrogen gas cylinder c3 are all conventional gas cylinders.

[0040] When operating this explosion soot blower, first, open the solenoid valve b7 and solenoid valve c8, and close the solenoid valve a6, so that oxygen and acetylene enter the combustion chamber 54 through the mixed gas inlet section 52 according to a certain ratio until the acetylene in the combustion explosion device 5 reaches the explosion concentration range; then, sequentially close the solenoid valve b7 and solenoid valve c8, open the solenoid valve a6, and ignite the acetylene gas in the combustion chamber 54 through the igniter 53 above the combustion explosion device 5; then, most of the expanding gas generated after the explosion will be sprayed onto the outer wall surface of the boiler furnace through the outlet soot blowing section 55; another part of the gas flows back to the Venturi ejector 4. When the flowing-back gas passes through the converging section 41, the flow cross-section decreases, the flow velocity increases and the pressure decreases. When the flowing-back gas enters the throat section 42, the gas flow velocity increases to the highest and the pressure drops to the lowest. The flowing-back gas will form a low-pressure area in the throat section 42, and nitrogen will be ejected through the ejection hole 44. When the nitrogen enters the Venturi ejector 4, it will prevent the combustion surface generated during the explosion in the pipeline from continuing to burn towards the oxygen gas cylinder a1 and the acetylene gas cylinder b2. The flowing-back gas will mix with nitrogen and enter the diverging section 43. The velocity of the mixed gas decreases and the pressure rises, and finally enters the pipeline system; in addition, nitrogen is ejected into the pipeline, which can weaken the impact of the pressure wave of the gas explosion back transmission on the solenoid valve b7 and solenoid valve c8.

[0041] In summary, the present invention utilizes the airflow generated by the explosion of oxygen and acetylene in the combustion explosion device to eject the inert gas nitrogen when flowing reversely through the Venturi ejector, weakens the impact of the explosion on the gas transmission pipeline and the solenoid valve, and uses nitrogen to block the explosion flashback, prolongs the service life of the equipment, and improves the safety of the explosion soot blowing system.

Claims

1. An ejector inert gas flame-retardant boiler explosion soot blower, characterized in that: It includes an oxygen gas cylinder a (1), an acetylene gas cylinder b (2), a nitrogen gas cylinder c (3), a Venturi ejector (4), a combustion and explosion device (5), a solenoid valve a (6), a solenoid valve b (7), a solenoid valve c (8), an elbow a (9), an elbow b (10), an elbow c (11), a three-way joint (12), a circular straight pipe a (13), a circular straight pipe b (14), a circular straight pipe c (15), a circular straight pipe d (16), a circular straight pipe e (17), a circular straight pipe f (18), a circular straight pipe g (19), a circular straight pipe h (20), a circular straight pipe i (21), a circular straight pipe j (22), a circular connecting pipe k (23), bolts a (24), bolts b (25), bolts c (26), bolts d (27), nuts a (28), nuts b (29), nuts c (30), and nuts d (31); An internal thread a (32) is provided on the oxygen gas cylinder a (1); An internal thread b (33) is provided on the acetylene gas cylinder b (2); An internal thread c (34) is provided on the nitrogen gas cylinder c (3); The Venturi ejector (4) is provided with a converging section (41), a throat section (42), a diverging section (43), an injection hole (44), an extended connecting section a (45), an extended connecting section b (46), an internal thread d (47), an internal thread e (48), and an internal thread f (49); The converging section (41) on the Venturi ejector (4) is a hollow conical cylinder, the throat section (42) is a hollow cylinder, the diverging section (43) is a hollow conical cylinder, and the extended connecting sections a (45) and b (46) are hollow cylinders; The combustion and explosion device (5) is provided with a connecting flange a (51), a mixed gas inlet section (52), an igniter (53), a combustion chamber (54), an outlet soot blowing section (55), a circular through hole a (56), a circular through hole b (57), a circular through hole c (58), and a circular through hole d (59); The igniter (53) is located above the combustion chamber (54); The solenoid valve a (6) is provided with an electromagnetic controller a (61), an internal thread g (62), and an internal thread h (63); The solenoid valve b (7) is provided with an electromagnetic controller b (71), an internal thread i (72), and an internal thread j (73); The solenoid valve c (8) is provided with an electromagnetic controller c (81), an internal thread k (82), and an internal thread L (83); The elbow a (9) is provided with an internal thread m (91) and an internal thread n (92); The elbow b (10) is provided with an internal thread o (101) and an internal thread p (102); The elbow c (11) is provided with an internal thread q (111) and an internal thread r (112); The three-way joint (12) is provided with an internal thread s (121), an internal thread t (122), and an internal thread u (123); External threads are provided at both ends of the circular straight pipes a (13), b (14), c (15), d (16), e (17), f (18), g (19), h (20), i (21), and j (22).The circular connecting pipe k (23) is provided with an external thread u (231), a circular pipe section (232), a connecting flange b (233), a circular through hole e (234), a circular through hole f (235), a circular through hole g (236) and a circular through hole h (237); the oxygen gas cylinder a (1) is sequentially connected to the internal thread s (121) of the circular straight pipe c (15), the solenoid valve c (8), the circular straight pipe e (17), the elbow c (11), the circular straight pipe g (19) and the tee joint (12); the acetylene gas cylinder b (2) is sequentially connected to the internal thread t (122) of the circular straight pipe b (14), the solenoid valve b (7), the circular straight pipe d (16), the elbow b (10), the circular straight pipe f (18) and the tee joint (12); the internal thread u (123) of the tee joint (12) is sequentially connected to the internal thread d (47) of the circular straight pipe h (20) and the Venturi injector (4); the nitrogen gas cylinder c (3) is sequentially connected to the internal thread e (48) of the circular straight pipe a (13), the solenoid valve a (6), the circular straight pipe i (21), the elbow a (9), the circular straight pipe j (22) and the Venturi injector (4); the internal thread f (49) of the Venturi injector (4) is sequentially connected to the circular connecting pipe k (23) and the combustion and explosion device (5); a flange connection is adopted between the circular connecting pipe k (23) and the combustion and explosion device (5), the bolt a (24) passes through the circular through hole e (234) and the circular through hole a (56) and is matched with the nut a (28), the bolt b (25) passes through the circular through hole f (235) and the circular through hole b (57) and is matched with the nut b (29), the bolt c (26) passes through the circular through hole g (236) and the circular through hole c (58) and is matched with the nut c (30), the bolt d (27) passes through the circular through hole h (237) and the circular through hole d (59) and is matched with the nut d (31); all connections in the pipeline are made by threaded connections, and a soot blowing and flame retardant system is generally formed.

2. The boiler explosion soot blower for ejecting inert gas for flame retardancy according to claim 1, characterized in that: The outer diameter of the converging section (41) of the Venturi ejector (4) is 40 mm, the inner diameter gradually decreases from 30 mm to 15 mm, and the length is 60 mm; the inner diameter of the throat section (42) is 15 mm, the outer diameter is 30 mm, and the length is 120 mm; the outer diameter of the diverging section (43) is 40 mm, the inner diameter gradually increases from 15 mm to 30 mm, and the length is 60 mm; the inner diameter of the extended connecting section a (45) is 30 mm, the outer diameter is 40 mm, and the length is 30 mm. An internal thread d (47) with a length of 25 mm is provided at the port of the extended connecting section a (45); the inner diameter of the extended connecting section b (46) is 30 mm, the outer diameter is 40 mm, and the length is 30 mm. An internal thread f (49) with a length of 25 mm is provided at the port of the extended connecting section b (46); the injection hole (44) is provided at the middle position of the throat section (42), the inner diameter is 30 mm, the depth is 30 mm, and an internal thread e (48) with a depth of 25 mm is provided in the injection hole (44). The axis of the injection hole (44) is perpendicular to the axis of the throat section (42); the axes of the extended connecting section a (45), the converging section (41), the throat section (42), the diverging section (43), and the extended connecting section b (46) are located on the same straight line.

3. The boiler explosion soot blower with ejecting inert gas for flame retardancy according to claim 1, characterized in that: The mixed gas inlet section (52) of the combustion and explosion device (5) is a hollow cylinder with an inner diameter of 30 mm, an outer diameter of 40 mm, and a length of 1000 mm; the connecting flange a (51) is located at the front section of the mixed gas inlet section (52) and is a hollow disc with an inner diameter of 30 mm, an outer diameter of 140 mm, and a thickness of 25 mm; the circular through holes a (56), b (57), c (58), and d (59) are all circular through holes with a diameter of 20 mm, and the center distances from their centers to the center point of the connecting flange a (51) are all 50 mm. The circular through holes a (56), b (57), c (58), and d (59) are evenly distributed along the circumferential direction of the connecting flange a (51); the combustion chamber (54) is a cuboid-shaped shell with a height of 1200 mm, the bottom is a square with a side length of 800 mm, and the shell thickness is 50 mm; the outlet soot blowing section (55) is a hollow cylinder with an inner diameter of 40 mm, an outer diameter of 50 mm, and a length of 3000 mm.

4. The boiler explosion soot blower using ejector inert gas for flame retardancy according to claim 1, characterized in that: The circular pipe section (232) of the circular connecting pipe k (23) is a hollow cylinder with an inner diameter of 25 mm, an outer diameter of 30 mm, and a length of 325 mm; the connecting flange b (233) is located at one end of the circular pipe section (232) and is a hollow disc with an inner diameter of 30 mm, an outer diameter of 140 mm, and a thickness of 25 mm; the circular through holes e (234), f (235), g (236), and h (237) are all circular through holes with a diameter of 20 mm, and their centers are all 50 mm away from the center of the connecting flange b (233) and are evenly distributed along the circumferential direction of the connecting flange b (233); an external thread u (231) is provided at the other port of the circular pipe section (232) with a length of 25 mm.

5. An ejector inert gas flame-retardant boiler explosion soot blower according to claim 1, characterized in that: The inner diameters of the solenoid valve a (6), solenoid valve b (7), and solenoid valve c (8) are all 30 mm, and the two ports are provided with internal threads; the inner diameters of the elbow a (9), elbow b (10), and elbow c (11) are 30 mm, and the two ports are provided with internal threads; the tee joint (12) is an equal-diameter T-shaped tee, and the inner diameters are all 30 mm. The two ports on the straight-through side are respectively provided with internal threads s (121) and internal threads t (122), and the port on the vertical side is provided with internal threads u (123); the circular straight pipes a (13), circular straight pipes b (14), circular straight pipes c (15), circular straight pipes d (16), circular straight pipes e (17), circular straight pipes f (18), circular straight pipes g (19), circular straight pipes h (20), circular straight pipes i (21), and circular straight pipes j (22) are all hollow cylinders, with an inner diameter of 25 mm and an outer diameter of 30 mm, and external threads are provided at both ends of the straight pipe; the bolts a (24), bolts b (25), bolts c (26), and bolts d (27) are all M10 standard hexagonal bolts; the nuts a (28), nuts b (29), nuts c (30), and nuts d (31) are all M10 standard round nuts.

6. The boiler explosion soot blower using ejector inert gas for flame retardancy according to claim 1, characterized in that: When the airflow generated by the explosion of oxygen and acetylene in the combustion and explosion device (5) passes through the Venturi ejector (4) in the reverse direction, the solenoid valve a (6) of the nitrogen gas pipeline is opened to eject the inert gas nitrogen.

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