Flushing device for preventing crystal blockage

Abstract

The invention relates to the technical field of chemical production, and particularly discloses a flushing device for preventing crystal blockage, which comprises a first regulating valve, a steam buffer tank, an electromagnetic valve, a gas purging pipe and a steam distribution station. Steam is introduced into the steam buffer tank by controlling the first regulating valve, and the pressure of the steam buffer tank is controlled and regulated by the first regulating valve; the steam distribution station is provided with an opening connecting pipe, the opening connecting pipe is connected with the gas purging pipe, the electromagnetic valve is arranged on the opening connecting pipe, and steam is controlled to enter the gas purging pipe through timing opening of the electromagnetic valve; the gas purging pipe is arranged in the container and used for purging the inner wall of the container through steam. Traditional thinking is broken through, the steam buffer tank, the steam distribution station and the gas purging pipe are arranged, steam purging is adopted, wall attachment or wall attachment growth can be prevented, and the problem that wall attachment and chipping or pipeline blockage easily caused by flushing of a two-section evaporation separator of an existing urea production device is solved; and the problem of shutdown hot washing caused by wall bonding can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical production, in particular to the technical field of flushing to prevent crystallization blockage used in urea production device. BACKGROUND

[0002] At present, the second evaporation separator of the evaporation post of the urea production device has the problem of walling in the inner wall of the upper head. Walling is the crystallization of substances in the container on the inner wall, which becomes thicker and thicker. The method used by all enterprises to deal with walling is to flush with steam condensate.

[0003] If the amount of flushing water is small, the walling cannot be flushed down, and if the amount of flushing water is large, a large amount of water will enter the separator, the water entering the separator will vaporize by absorbing heat, causing the reaction temperature to decrease, or a large amount of crystalline blocks will fall down, blocking the pump or the pipe of the equipment, and the device is forced to shut down and restart, which causes the product quality to fluctuate and the energy consumption to increase. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a flushing device capable of preventing walling or preventing walling from growing, and avoiding the use of flushing water which can cause the reaction temperature to decrease due to water vaporization and heat absorption, or the pipe to be blocked by too large crystalline blocks.

[0005] To solve the above technical problems, the technical solution adopted by the present application is:

[0006] A flushing device for preventing crystallization blockage, comprising: a first regulating valve, a steam buffer tank, an electromagnetic valve, a gas flushing pipe and a steam distribution station;

[0007] The steam buffer tank is provided with a steam inlet pipeline and a steam outlet pipeline;

[0008] The first regulating valve is arranged on the steam inlet pipeline, and the steam is connected into the steam buffer tank by controlling the first regulating valve, and the pressure of the steam buffer tank is controlled and adjusted by the first regulating valve;

[0009] The steam distribution station is connected with the steam outlet pipeline, and is provided with an open connection pipe, the open connection pipe is connected with the gas flushing pipe, and the electromagnetic valve is arranged on the open connection pipe, and the steam is controlled to enter the gas flushing pipe by opening the electromagnetic valve at a certain time;

[0010] The gas flushing pipe is arranged inside the container, and is used for flushing the inner wall of the container with steam.

[0011] As a further technical solution, the gas flushing pipe is arranged at the top of the second evaporation separator, so that the steam flushes the inner wall of the second evaporation separator through the gas flushing pipe.

[0012] As a further technical scheme, the gas purging pipe is fixed on the inner wall of the upper head at the top of the two-stage evaporation separator, the gas purging pipe is provided with three rows of purging small holes, the included angle between two rows of purging small holes in the three rows of purging small holes of the gas purging pipe is 60°, the center line of the middle row of purging small holes passes through the center point of the upper head, and the center line of the middle row of purging small holes is perpendicular to the gas purging pipe.

[0013] As a further technical scheme, the number of the gas purging pipes, the open connecting pipes and the electromagnetic valves is two or more; the number of the open connecting pipes and the electromagnetic valves corresponds to the number of the gas purging pipes, one electromagnetic valve is arranged on one open connecting pipe, and one gas purging pipe is connected.

[0014] As a further technical scheme, the flushing device for preventing crystallization blockage further comprises a second regulating valve and a flow limiting orifice plate; the second regulating valve regulates the amount of the condensed liquid entering the steam buffer tank through the flow limiting orifice plate.

[0015] As a further technical scheme, the flushing device for preventing crystallization blockage further comprises a drain device arranged at the bottom of the steam buffer tank.

[0016] As a further technical scheme, the top of the steam buffer tank is further provided with a safety valve, a vent valve and a remote pressure monitoring point.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. The present application avoids the large disadvantage that a large amount of water is gasified to absorb heat, so that the reaction temperature is low or the crystallization block is too large, and the pipeline is blocked, by arranging a steam buffer tank, a steam distribution station and a gas purging pipe to adopt steam purging.

[0019] 2. The present application is put into use after the production device is started, can prevent or prevent the growth of the wall, and can effectively avoid the problem of stopping and hot washing due to the wall. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structural schematic diagram of an embodiment of the present application.

[0021] Figure 2 The structural schematic diagram of the gas purging pipe of an embodiment of the present application.

[0022] Reference signs:

[0023] 1 first regulating valve, 2 steam buffer tank, 3 electromagnetic valve, 4 gas purging pipe, 5 two-stage evaporation separator, 6 steam distribution station, 7 second regulating valve, 8 flow limiting orifice plate, 9 drain device. DETAILED DESCRIPTION

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a flushing device for preventing crystallization blockage, comprising: a first regulating valve 1, a steam buffer tank 2, a solenoid valve 3, a gas purging pipe 4, and a steam distribution station 6.

[0026] The steam buffer tank 2 is equipped with a steam inlet pipeline and a steam outlet pipeline. The first regulating valve 1 is installed on the steam inlet pipeline. Steam is introduced into the steam buffer tank 2 by controlling the first regulating valve 1. The pressure of the steam buffer tank 2 is controlled and regulated by the first regulating valve 1.

[0027] Steam distribution station 6 is connected to the steam outlet pipeline. Steam distribution station 6 is equipped with an open pipe that connects to gas purging pipe 4. A solenoid valve 3 is installed on the open pipe. The solenoid valve 3 is opened periodically to control the entry of steam into gas purging pipe 4. Gas purging pipe 4 is located inside the container and is used to purge the inner wall of the container with steam. The steam in steam buffer tank 2 can be process steam from the urea plant's steam network or other types of steam.

[0028] The gas purge pipe 4 is installed at the top of the second-stage evaporator separator 5, so that steam can purge the inner wall of the second-stage evaporator separator 5 through the gas purge pipe 4, thereby achieving the purpose of rinsing the inner wall of the second-stage evaporator separator 5 to prevent crystallization.

[0029] The gas purge pipe 4 is fixed to the inner wall of the upper end cap at the top of the second-stage evaporator separator 5. The gas purge pipe 4 has three rows of purge holes, the diameter of which can be large or small depending on the actual situation. Steam passes through the three rows of purge holes on the gas purge pipe 4 to purge the crystals. Figure 2 As shown, the included angle between two rows of purge holes in the three rows of purge holes in the gas purge pipe 4 is 60°. The center line of the middle row of purge holes passes through the center point of the upper end cap, and the center line of the middle row of purge holes is perpendicular to the gas purge pipe.

[0030] The number of gas purge pipes 4 is two or more, such as 2, 3, 4, 5, 6, 7, or more, mainly depending on the radius of the sphere at the top of the two-stage evaporator separator 5. The number of open pipes and solenoid valves 3 is two or more, corresponding to the number of gas purge pipes 4. One solenoid valve 3 is installed on one open pipe and connected to one gas purge pipe 4.

[0031] In one embodiment, the flushing device for preventing crystallization blockage according to the present invention further includes: a second regulating valve 7 and a flow-limiting orifice plate 8; the second regulating valve 7 regulates the amount of condensate entering the steam buffer tank 2 through the flow-limiting orifice plate 8. The condensate entering the steam buffer tank 2 can be process condensate from the urea plant or steam condensate.

[0032] In one embodiment, the flushing device for preventing crystallization blockage of the present invention further includes: a hydrophobic device 9, disposed at the bottom of the steam buffer tank 2.

[0033] In one embodiment, the top of the steam buffer tank 2 is also equipped with a safety valve, a vent valve, and a remote pressure monitoring point.

[0034] The specific structures of the aforementioned drainage device, safety valve, vent valve, and remote pressure monitoring point are existing technologies and will not be described in detail here.

[0035] The operating method of this invention is as follows:

[0036] Process steam enters the steam buffer tank 2 through the first regulating valve 1. The pressure of the steam buffer tank 2 is also controlled and regulated by the first regulating valve 1. The second regulating valve 7 regulates the amount of process condensate entering the steam buffer tank through the flow limiting orifice plate. The bottom of the steam buffer tank 2 has a condensate drain device, and the top of the steam buffer tank 2 is equipped with a safety valve, a vent valve, and a remote pressure monitoring point. After exiting the buffer tank, the steam enters the steam distribution station 6 and enters the gas purge pipe 4 at the top of the second-stage evaporator separator 5 through the timed opening of the solenoid valve 3. The steam purges the crystals through the three rows of purge holes on the gas purge pipe, thereby preventing crystallization on the inner wall of the second-stage evaporator separator 5.

[0037] The advantages of this invention are:

[0038] 1. The present invention uses steam purging to avoid the major drawback of a large amount of water vaporization absorbing heat, resulting in a low reaction temperature or large crystal blocks, which would block the pipeline.

[0039] 2. Most companies need to use hot washing equipment to remove the wall buildup after the two-stage evaporator separator has been running for a period of time. This invention can be put into use after the production unit is started, which can prevent wall buildup or prevent the wall buildup from growing, and can effectively avoid the problem of shutdown for hot washing due to wall buildup.

[0040] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A flushing device for preventing crystallization blockage, characterized in that, It includes: The system includes a first regulating valve, a steam buffer tank, a solenoid valve, a gas purging pipe, and a steam distribution station. The steam buffer tank is equipped with a steam inlet pipeline and a steam outlet pipeline; The first regulating valve is installed on the steam inlet pipeline. Steam is introduced into the steam buffer tank by controlling the first regulating valve. The pressure of the steam buffer tank is controlled and regulated by the first regulating valve. The steam distribution station is connected to the steam outlet pipeline. The steam distribution station is equipped with an open pipe, which is connected to a gas purging pipe. The solenoid valve is installed on the open pipe, and the solenoid valve is opened at timed intervals to control the steam to enter the gas purging pipe. The gas purging pipe is located inside the container and is used to purge the inner wall of the container with steam.

2. The flushing device for preventing crystallization blockage according to claim 1, characterized in that, The gas purge pipe is located at the top of the second-stage evaporator separator, allowing steam to purge the inner wall of the second-stage evaporator separator through the gas purge pipe.

3. The flushing device for preventing crystallization blockage according to claim 2, characterized in that, The gas purge pipe is fixed on the inner wall of the upper end cap at the top of the two-stage evaporator separator. The gas purge pipe has three rows of purge holes. The included angle between two rows of purge holes in the three rows of purge holes is 60°. The center line of the middle row of purge holes passes through the center point of the upper end cap and is perpendicular to the gas purge pipe.

4. A flushing device for preventing crystallization blockage according to claim 1, 2 or 3, characterized in that, The number of gas purging pipes, open pipes, and solenoid valves are all two or more; The number of open connectors and solenoid valves corresponds to the number of gas purge pipes. One solenoid valve is installed on one open connector and connected to one gas purge pipe.

5. A flushing device for preventing crystallization blockage according to claim 1, 2 or 3, characterized in that, It also includes: a second regulating valve and a flow-limiting orifice plate; The second regulating valve controls the amount of condensate that enters the steam buffer tank through the flow-limiting orifice plate.

6. A flushing device for preventing crystallization blockage according to claim 5, characterized in that, It also includes a hydrophobic device, which is installed at the bottom of the steam buffer tank.

7. A flushing device for preventing crystallization blockage according to claim 6, characterized in that, The top of the steam buffer tank is also equipped with a safety valve, a vent valve, and a remote pressure monitoring point.

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