Ash removal gun for hydrogen sulfide waste heat boiler

Abstract

The utility model discloses a deashing gun for a hydrogen sulfide waste heat boiler, which relates to the technical field of production of sulfuric acid by cracking hydrogen sulfide waste acid and comprises a gun head and an air supply pipe, an airflow cavity is arranged in the gun head, one end of the air supply pipe is communicated with the airflow cavity of the gun head, and the other end of the air supply pipe is used for introducing compressed air. The gun head and the gas supply pipe can be inserted into a smoke pipe of the waste heat boiler; a plurality of air injection holes are formed in the gun head, each air injection hole is communicated with the air flow cavity of the gun head, a flow guide mechanism is arranged in the air flow cavity of the gun head, and the flow guide mechanism is used for guiding compressed air flow in the air flow cavity of the gun head into each air injection hole so as to purge dust and dirt on the pipe wall of a smoke pipe of the waste heat boiler. The boiler smoke pipe dust removal device is good in dust removal effect, the cleaning efficiency of the boiler smoke pipe is improved, and manual labor is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of sulfuric acid production by cracking hydrogen sulfide waste acid, in particular to a soot cleaning gun for a hydrogen sulfide waste heat boiler. Background Art

[0002] In the process of using the process of burning hydrogen sulfide and cracking waste acid to produce sulfuric acid, hydrogen sulfide generated by the original ammonia synthesis unit is mainly sent into an incinerator to be mixed with air for combustion to generate sulfur dioxide and water vapor, and a large amount of heat is released. At the same time, waste acid with a sulfuric acid concentration of 90% generated by the original alkylation unit is sprayed into the incinerator through a waste acid spray gun, and the waste acid is pyrolyzed at high temperature by using the heat generated by the combustion of hydrogen sulfide to generate sulfur dioxide flue gas. Then, the sulfur dioxide flue gas discharged from the incinerator is cooled by a waste heat boiler and by-produces steam. The cooled sulfur dioxide flue gas is washed, purified, dried, and boosted by a sulfur dioxide blower and sent to a subsequent sulfuric acid unit to produce sulfuric acid, achieving the purpose of pollution control and resource recycling.

[0003] In the above process, due to the large amount of impurities in the waste acid, some dust will be generated after the waste acid is cracked and adhered to the wall of the flue pipe of the waste heat boiler. If the dust is not cleaned for a long time, it will become scale, resulting in an increase in the resistance of the waste heat boiler, a decrease in the heat exchange efficiency, a reduction in the waste acid injection amount, and an impact on the petrochemical production load. Therefore, it is necessary to regularly clean the scale on the wall of the flue pipe of the waste heat boiler.

[0004] Currently, a stainless steel pipe with a DN32 is usually used to manually clean the flue pipe of the waste heat boiler. The stainless steel pipe is carried by workers and inserted into the flue pipe. The outer diameter of the stainless steel pipe is slightly smaller than the inner diameter of the flue pipe, and the scale on the wall of the flue pipe can be brought out. However, since the main body of the waste heat boiler is 9m long and the front and rear smoke boxes are each 2m long, the stainless steel pipe used for cleaning is long and heavy, and at least 8 people are required to carry it. The cleaning takes more than 4 hours. Moreover, when the scale on the wall of the flue pipe is seriously fouled, a greater external force is required to insert the stainless steel pipe into the flue pipe to clear it, which is time-consuming and laborious, and the cleaning efficiency is low. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a soot cleaning gun for a hydrogen sulfide waste heat boiler to solve the problems existing in the above-mentioned prior art, with good soot cleaning effect, improved cleaning efficiency of the boiler flue pipe, and labor saving.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] The utility model provides a soot cleaning gun for a hydrogen sulfide waste heat boiler, which comprises a gun head and an air supply pipe. An air flow cavity is arranged in the gun head. One end of the air supply pipe is communicated with the air flow cavity of the gun head, and the other end is used for introducing compressed air. The gun head together with the air supply pipe can be inserted into the smoke pipe of the waste heat boiler. A plurality of air jet holes are formed in the gun head, and each air jet hole is communicated with the air flow cavity of the gun head. A flow guiding mechanism is arranged in the air flow cavity of the gun head, and the flow guiding mechanism is used for guiding the compressed air flow in the air flow cavity of the gun head into each air jet hole to blow the dirt on the pipe wall of the smoke pipe of the waste heat boiler.

[0008] Preferably, the gun head is of a tubular structure, and the end of the gun head far away from the air supply pipe is a conical tip.

[0009] Preferably, all the air jet holes are circumferentially and uniformly distributed on the gun head and are located at a position close to the conical tip of the gun head.

[0010] Preferably, the flow guiding mechanism is a flow guiding vane. The flow guiding vane is of a columnar structure, and the flow guiding vane is coaxially arranged with the gun head and the air supply pipe. A flow guiding channel penetrates through the flow guiding vane, and the flow guiding channel is inclined from inside to outside along the extending direction of the gun head. A plurality of flow guiding channels are arranged, and the flow guiding channels correspond to the air jet holes one by one.

[0011] Preferably, the gun head is of a DN25 tubular structure; the air supply pipe is a DN12 pipe.

[0012] Preferably, the aperture of the air jet hole is 3 mm; six air jet holes are arranged.

[0013] Preferably, a valve is arranged on the air supply pipe.

[0014] Preferably, the valve is a pneumatic regulating valve.

[0015] The utility model has achieved the following technical effects compared with the prior art:

[0016] The soot cleaning gun for a hydrogen sulfide waste heat boiler provided by the utility model comprises a gun head and an air supply pipe. A plurality of air jet holes are formed in the gun head. During use, the gun head together with the air supply pipe is inserted into the smoke pipe of the waste heat boiler, and compressed air is introduced into the air supply pipe. The compressed air enters the air flow cavity of the gun head and is guided into each air jet hole by the flow guiding mechanism, and then sprays out from the air jet holes and impacts on the pipe wall of the smoke pipe, so as to blow out the dirt on the pipe wall of the smoke pipe. By using the soot cleaning gun to reciprocally stretch and sweep in the smoke pipe for cleaning, the soot cleaning effect is good, the cleaning efficiency of the boiler smoke pipe is improved, and the labor is saved. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the soot cleaning gun for the hydrogen sulfide waste heat boiler provided by the embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the working state of the soot cleaning gun for the hydrogen sulfide waste heat boiler provided by the embodiment of the present invention.

[0020] In the figure: 01 - waste heat boiler body, 02 - front smoke box, 03 - rear smoke box, 1 - gun head, 2 - air supply pipe, 3 - air injection holes, 4 - guide vanes. Detailed implementation manners

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a soot cleaning gun for a hydrogen sulfide waste heat boiler to solve the problems existing in the prior art, with good soot cleaning effect, improved cleaning efficiency of the boiler flue pipes, and saved manual labor.

[0023] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0024] As Figure 1 shown, this embodiment provides a soot cleaning gun for a hydrogen sulfide waste heat boiler, including a gun head 1 and an air supply pipe 2. An air flow cavity is provided in the gun head 1. One end of the air supply pipe 2 is communicated with the air flow cavity of the gun head 1, and the other end is used to introduce compressed air. Moreover, the gun head 1 together with the air supply pipe 2 can be inserted into the flue pipe of the waste heat boiler; a plurality of air injection holes 3 are opened on the gun head 1, and each air injection hole 3 is communicated with the air flow cavity of the gun head 1. And a flow guiding mechanism is provided in the air flow cavity of the gun head 1. The flow guiding mechanism is used to guide the compressed air flow in the air flow cavity of the gun head 1 into each air injection hole 3 to blow the dirt on the wall of the flue pipe of the waste heat boiler.

[0025] In this embodiment, the gun head 1 is a tubular structure, and the end of the gun head 1 far from the gas supply pipe 2 is a conical tip, which facilitates the quick and accurate insertion of the gun head 1 into the smoke pipe.

[0026] Furthermore, all the air injection holes 3 are circumferentially evenly distributed on the gun head 1 and are located at a position close to the conical tip of the gun head 1.

[0027] In this embodiment, the flow guiding mechanism is a flow guiding vane 4. The flow guiding vane 4 is a columnar structure, and the flow guiding vane 4 is coaxially arranged with the gun head 1 and the gas supply pipe 2; a flow guiding channel penetrates through the flow guiding vane 4, and the flow guiding channel is inclined from inside to outside along the extending direction of the gun head 1; there are multiple flow guiding channels, and the flow guiding channels correspond to the air injection holes 3 one by one; specifically, on the side of the flow guiding vane 4 close to the gas supply pipe 2, multiple air inlet ports are arranged circumferentially, and each air inlet port is located at a position close to the center of the flow guiding vane 4. On the side of the flow guiding vane 4 far from the gas supply pipe 2, multiple air outlet ports are arranged circumferentially, and each air outlet port is located at a position close to the edge of the flow guiding vane 4, and the air inlet ports and the air outlet ports correspond to each other one by one. Each air inlet port is connected to the corresponding air outlet port to form a flow guiding channel; the compressed air flow in the air flow cavity of the gun head 1 is cut and divided by the flow guiding channels on the flow guiding vane 4, and the compressed air is ejected from the corresponding air injection hole 3 through the flow guiding channel, so that the compressed air diffuses from the gun head 1, ensuring the dust cleaning effect on the wall of the smoke pipe.

[0028] In this embodiment, the gun head 1 is a tubular structure with a diameter of DN25, preferably made of carbon steel; the gas supply pipe 2 is a carbon steel pipe with a diameter of DN12; specifically, in this embodiment, the waste heat boiler body 01 to be cleaned is 9 m long, and the front smoke box 02 and the rear smoke box 03 are each 2 m long. Therefore, the overall length of the dust cleaning gun is preferably 20 m, and the length of the gun head 1 is preferably 10 cm; compared with using a stainless steel pipe with a diameter of DN32 for cleaning, in this embodiment, changing to a carbon steel pipe with a diameter of DN12 to pass compressed air for cleaning only requires 3 to 4 workers, and the cleaning time is controlled within 2 hours, saving time and effort.

[0029] In this embodiment, the aperture of the air injection hole 3 is 3 mm; there are 6 air injection holes 3.

[0030] In this embodiment, a pneumatic regulating valve is arranged on the gas supply pipe 2 to facilitate the control of the air intake volume of the gas supply pipe 2; specifically, in this embodiment, the air source pipe of the compressed air is connected to the gas supply pipe 2, and it is necessary to ensure that the pressure of the compressed air introduced into the gas supply pipe 2 is above 0.5 MPa.

[0031] The use process of the hydrogen sulfide waste heat boiler dust cleaning gun provided in this embodiment is as follows:

[0032] In this embodiment, there are 56 ash cleaning holes in the waste heat boiler and 255 boiler flue tubes. During cleaning, first, the ash cleaning holes of the boiler are opened manually. Then, the ash cleaning gun is inserted into the boiler flue tube, and compressed air is introduced into the ash cleaning gun (as shown in Figure 2 . The left arrow in the figure indicates the flow direction of the compressed air). The compressed air enters the air flow chamber of the gun head 1 and is introduced into each air jet hole 3 through the guide vane 4, and then sprays out from the air jet hole 3 and impacts on the wall of the flue tube, so as to blow out the dirt on the wall of the flue tube. When cleaning each flue tube, it is stretched back and forth 2 - 3 times until the dust on the wall of the flue tube is cleaned. Opening one ash cleaning hole can clean 6 flue tubes; after cleaning, the temperature and pressure of the waste heat boiler are controllable, and the waste acid injection amount can reach 1.7 m 3 / h (previously, it could only reach 1.5 m 3 / h at most, and the maintenance time was short), meeting the production use purpose. Moreover, the blown dust can enter the subsequent purification system for treatment under the action of negative pressure, and the generated dilute acid is sent to be used in phosphoric acid.

[0033] Specific examples are applied in the present utility model to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, based on the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A hydrogen sulfide waste heat boiler cleaning gun, characterized in that: It comprises a gun head and an air supply pipe, wherein an air flow cavity is arranged in the gun head, one end of the air supply pipe is connected with the air flow cavity of the gun head, and the other end is used for introducing compressed air, and the gun head together with the air supply pipe can be inserted into the smoke pipe of the waste heat boiler; a plurality of jet holes are opened on the gun head, each of the jet holes is connected with the air flow cavity of the gun head, and a guide mechanism is arranged in the air flow cavity of the gun head, and the guide mechanism is used for guiding the compressed air flow in the air flow cavity of the gun head into each of the jet holes, so as to blow away the dust and dirt on the wall of the smoke pipe of the waste heat boiler.

2. The hydrogen sulfide waste heat boiler cleaning gun according to claim 1 is characterized in that: The gun head is a tubular structure, and one end of the gun head away from the air supply pipe is a conical tip.

3. The hydrogen sulfide waste heat boiler cleaning gun according to claim 2 is characterized in that: All the air injection holes are evenly distributed on the gun head along the circumferential direction and are located near the conical tip of the gun head.

4. The hydrogen sulfide waste heat boiler cleaning gun according to claim 2 is characterized in that: The guide mechanism is a guide plate, which is a columnar structure and is coaxially arranged with the gun head and the air supply pipe; a guide channel runs through the guide plate, and the guide channel is inclined from the inside to the outside along the extension direction of the gun head; there are multiple guide channels, and each of the guide channels corresponds to the air jet holes one by one.

5. The hydrogen sulfide waste heat boiler cleaning gun according to claim 2 is characterized in that: The gun head is a DN25 tubular structure; the air supply pipe is a DN12 pipe.

6. The hydrogen sulfide waste heat boiler cleaning gun according to claim 5 is characterized in that: The diameter of the air jet hole is 3 mm; and 6 air jet holes are provided.

7. The hydrogen sulfide waste heat boiler cleaning gun according to claim 1 is characterized in that: The air supply pipe is provided with a valve.

8. The hydrogen sulfide waste heat boiler cleaning gun according to claim 7 is characterized in that: The valve is a pneumatic regulating valve.

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