Liquid returning anti-blocking pipeline of gas preheater for ammonium sulfate production

Abstract

The utility model discloses a liquid return anti-blocking pipeline of a gas preheater for ammonium sulfate production, which comprises the preheater, a circular filter mesh with an inclined downward angle is coaxially arranged in an inner cavity of a liquid return main pipe, and a branch pipe with an inclined downward angle is communicated with the side wall of the liquid return main pipe. The input end of the branch pipe faces the inclined plane of the circular filter screen piece, the output end of the branch pipe is vertically and downwards communicated with an impurity storage pipe, a first valve is installed at the bottom end of the impurity storage pipe, an overflow pipe with an inclined downward angle is communicated between the impurity storage pipe and the liquid return main pipe, and a second valve is installed at the bottom end of the overflow pipe. A filter cartridge is mounted at the input end of the overflow pipe; the liquid return pipe has the beneficial effects that the circular filter screen sheet is arranged in the liquid return main pipe, so that an asphalt residue mixture carried in recycled condensate can be filtered out and discharged into the impurity storage pipe, a liquid return pipeline is prevented from being blocked, the backflow resistance of the condensate is reduced, and an ammonium sulfate production system can normally and safely operate.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of ammonium sulfate production, especially relates to a coal gas preheater liquid withdrawal anti-blocking pipeline for ammonium sulfate production. BACKGROUND

[0002] Ammonium sulfate is an inorganic substance, colorless crystal or white particle, odorless. Ammonium sulfate is mainly used as fertilizer, suitable for various soils and crops. Also can be used in textile, leather, medicine and other aspects.

[0003] In the production of ammonium sulfate, the desulfurization section of the coal gas will be transported to the preheater, and the main function of the preheater is to heat the coal gas, the purpose is to maintain the water balance in the saturator in the subsequent section, prevent the mother liquor from being diluted or concentrated, so as to avoid the phenomenon of too small crystallization ratio or blockage. In the preheater, the temperature of the coal gas is raised from about 35 DEG C to about 45 DEG C by steam, and then enters the saturator. After heat exchange, the steam will form condensate and gather at the bottom of the preheater, and the condensate will be recovered and reused by the liquid withdrawal pipe (also known as the liquid discharge pipe). During the preheating process, the tar mist in the coal gas and the fixed ammonium salt in the condensate will form asphalt residue mixture, which will accumulate at the bottom of the preheater. When the liquid withdrawal pipe at the bottom of the preheater is withdrawn, the asphalt residue mixture will enter the liquid withdrawal pipe, causing the liquid withdrawal pipe to be blocked, the condensate return resistance to increase, and the normal operation of the ammonium sulfate production system to be affected. At the same time, frequent shutdown and disassembly of the liquid withdrawal pipe are required for dredging operation, which has large amount of residue removal engineering and long time consumption, and there is a certain safety risk in the residue removal operation in the limited space. SUMMARY

[0004] The utility model aims at providing a kind of coal gas preheater liquid withdrawal anti-blocking pipeline for ammonium sulfate production, and overcome the above prior art deficiencies, effectively solve the existing problems of preheater liquid withdrawal pipeline blockage.

[0005] The utility model relates to a kind of coal gas preheater liquid withdrawal anti-blocking pipeline for ammonium sulfate production, including preheater, in the bottom end vertical downward of the preheater is communicated with liquid withdrawal main pipe, in the inner cavity of the liquid withdrawal main pipe coaxially is provided with angle inclined downward circular filter screen, in the side wall of the liquid withdrawal main pipe is communicated with angle inclined downward branch pipe, the input end of the branch pipe is towards the inclined surface of the circular filter screen, in the output end of the branch pipe vertical downward is communicated with the miscellaneous pipe, in the bottom end of the miscellaneous pipe is installed with first valve, in the between the miscellaneous pipe and the liquid withdrawal main pipe is communicated with angle inclined downward overflow pipe, in the input end of the overflow pipe is installed with filter cartridge.

[0006] Further, a sedimentation pipe is communicated with the bottom end of the liquid return main pipe, a second valve is installed at the bottom end of the sedimentation pipe, and a flow guide pipe is communicated with the side wall of the top end of the sedimentation pipe, and the output end of the flow guide pipe is communicated with a liquid return auxiliary pipe.

[0007] Further, the flow guide pipe is upwardly inclined at an angle.

[0008] Further, a pipeline sight glass is installed on the sedimentation pipe.

[0009] Further, a circular gasket is coaxially and fixedly installed in the inner cavity of the liquid return main pipe and is downwardly inclined at an angle, and the circular filter screen is placed on the circular gasket.

[0010] Further, the installation inclination angle of the branch pipe is the same as the installation inclination angle of the circular filter screen.

[0011] The beneficial effects of the present application are as follows: the circular filter screen installed in the liquid return main pipe can filter out the asphalt residue mixture carried in the recycled condensate and discharge the asphalt residue mixture into the miscellaneous storage pipe, and the sedimentation pipe can further precipitate the small volume of residual asphalt residue mixture carried in the filtered condensate, thereby further improving the filtering effect of the asphalt residue mixture in the condensate, avoiding blockage of the liquid return pipeline, reducing the backflow resistance of the condensate, and ensuring normal and safe operation of the ammonium sulfate production system. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a partial cross-sectional view of the front view of the present application.

[0013] In the figure, 1 is a liquid return main pipe, 2 is a circular filter screen, 3 is a branch pipe, 4 is a miscellaneous storage pipe, 5 is a first valve, 6 is an overflow pipe, 7 is a filter cartridge, 8 is a sedimentation pipe, 9 is a second valve, 10 is a flow guide pipe, 11 is a liquid return auxiliary pipe, 12 is a pipeline sight glass, and 13 is a circular gasket. DETAILED DESCRIPTION

[0014] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation mode of the present application will be described with reference to the accompanying drawings:

[0015] For example, Figure 1As shown, a gas preheater anti-clogging pipeline for ammonium sulfate production includes a preheater. A main drain pipe 1 is vertically connected to the bottom of the preheater. A circular filter screen 2 with a downward angle is coaxially arranged in the inner cavity of the main drain pipe 1. A branch pipe 3 with a downward angle is connected to the side wall of the main drain pipe 1. The input end of the branch pipe 3 faces the inclined surface of the circular filter screen 2. A storage pipe 4 with a downward angle is vertically connected to the output end of the branch pipe 3. A first valve 5 is installed at the bottom end of the storage pipe 4. An overflow pipe 6 with a downward angle is connected between the storage pipe 4 and the main drain pipe 1. A filter cylinder 7 is installed at the input end of the overflow pipe 6. A circular washer 13 with a downward angle is coaxially fixed in the inner cavity of the main drain pipe 1. The circular filter screen 2 is placed on the circular washer 13. The installation tilt angle of the branch pipe 3 is the same as the installation tilt angle of the circular filter screen 2.

[0016] Specifically, the asphalt residue mixture carried in the recovered condensate can be filtered out by the circular filter screen 2 installed in the main discharge pipe 1 and discharged into the miscellaneous pipe 4.

[0017] In actual use, when the condensate generated after heat exchange in the preheater enters the main drain pipe 1, the circular filter screen 2, which is tilted downwards, filters out the larger volume of asphalt residue mixture carried in the condensate. The mixture then rolls smoothly into the branch pipe 3 and finally falls into the storage pipe 4 for temporary storage. The first valve 5 is opened periodically to discharge the asphalt residue mixture. Since the surface of the filtered asphalt residue mixture also carries a small amount of condensate, solid-liquid stratification occurs when the asphalt residue mixture accumulates in the storage pipe 4. When the separated condensate reaches a specified height, it flows back to the main drain pipe 1 through the overflow pipe 6, thereby improving the condensate recovery rate. The filter cylinder 7 prevents the asphalt residue mixture from clogging the overflow pipe 6. The circular filter screen 2 is placed on the circular gasket 13, so that the circular filter screen 2 can be quickly removed from the main drain pipe 1 when the preheater is shut down for maintenance. The installation tilt angle of the branch pipe 3 is the same as that of the circular filter screen 2, so that the filtered asphalt residue mixture can smoothly roll into the storage pipe 4 for temporary storage.

[0018] like Figure 1 As shown, a gas preheater anti-clogging pipeline for ammonium sulfate production has a settling pipe 8 connected to the bottom end of the main settling pipe 1, a second valve 9 installed at the bottom end of the settling pipe 8, a guide pipe 10 connected to the top side wall of the settling pipe 8, the output end of the guide pipe 10 connected to the settling auxiliary pipe 11, the guide pipe 10 with an upward angle connected to the top side wall of the settling pipe 8, and a pipe sight glass 12 installed on both the storage pipe 4 and the settling pipe 8.

[0019] Specifically, the small volume residual asphalt residue mixture carried by the filtered condensate can be precipitated through the settling tube 8, thereby further improving the filtering effect of the asphalt residue mixture in the condensate.

[0020] In actual use, the filtered condensate flows into the settling tube 8, at this time, the small volume residual asphalt residue mixture carried by the condensate self-settles to the bottom of the settling tube 8 under the action of its own gravity, and the relatively pure condensate flows into the flow guide pipe 10 and is finally transported into the condensate return auxiliary pipe 11 and returned to the recovery system; when the residue is discharged periodically, the valve upstream of the condensate return main pipe 1 can be closed first, the second valve 9 is opened to discharge the precipitated asphalt residue mixture; the upwardly inclined flow guide pipe 10 makes the individual asphalt residue mixture entering the flow guide pipe 10 fall again into the settling tube 8 under the action of its own gravity, thereby further preventing the precipitated asphalt residue mixture from flowing into the condensate return auxiliary pipe 11; the quantity of the asphalt residue mixture accumulated in the storage pipe 4 and the settling tube 8 can be observed at any time through the pipe sight glass 12, so as to facilitate the staff to discharge the residue in time.

[0021] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A kind of anti-blocking pipeline for liquid withdrawal of ammonium sulfate production coal gas preheater, comprising preheater, the bottom end of the preheater is vertically downwardly connected with liquid withdrawal main pipe (1), characterized in that: The angle downwardly inclined circular filter screen (2) is coaxially arranged in the inner cavity of the liquid return main pipe (1), the angle downwardly inclined branch pipe (3) is communicated with the side wall of the liquid return main pipe (1), the input end of the branch pipe (3) is directed to the inclined surface of the circular filter screen (2), the vertical downwardly communicated sundry storage pipe (4) is communicated with the output end of the branch pipe (3), the first valve (5) is installed at the bottom end of the sundry storage pipe (4), the angle downwardly inclined overflow pipe (6) is communicated between the sundry storage pipe (4) and the liquid return main pipe (1), the filter cylinder (7) is installed at the input end of the overflow pipe (6).

2. The anti-blocking pipeline for liquid withdrawal of a coal gas preheater for ammonium sulfate production according to claim 1, characterized in that: The settling pipe (8) is communicated with the bottom end of the liquid return main pipe (1), the second valve (9) is installed at the bottom end of the settling pipe (8), the flow guide pipe (10) is communicated with the top end side wall of the settling pipe (8), the output end of the flow guide pipe (10) is communicated with the liquid return branch pipe (11).

3. The anti-blocking pipeline for liquid withdrawal of a coal gas preheater for ammonium sulfate production according to claim 2, characterized in that: The angle upwardly inclined flow guide pipe (10) is communicated with the top end side wall of the settling pipe (8).

4. The anti-blocking pipeline for liquid withdrawal of a coal gas preheater for ammonium sulfate production according to claim 2, characterized in that: The pipeline sight glass (12) is installed on the sundry storage pipe (4) and the settling pipe (8).

5. The anti-blocking pipeline for liquid withdrawal of a coal gas preheater for ammonium sulfate production according to claim 1, characterized in that: The angle downwardly inclined circular gasket (13) is coaxially fixedly installed in the inner cavity of the liquid return main pipe (1), and the circular filter screen (2) is placed on the circular gasket (13).

6. The anti-blocking pipeline for liquid withdrawal of a coal gas preheater for ammonium sulfate production according to claim 5, characterized in that: The installation inclined angle of the branch pipe (3) is same as the installation inclined angle of the circular filter screen (2).

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