Filtering device for urea washing tower

Abstract

The utility model relates to a filtering device for a urea washing tower, which comprises a filter screen A arranged in a circulating pipe of the washing tower, the filter screen A is obliquely arranged along the transmission direction of the circulating pipe, and a discharge pipe communicated with the circulating pipe is arranged at one end, facing the transmission direction of the circulating pipe, of the filter screen A; a filter screen B attached to the inner wall of the discharging pipe is arranged in the discharging pipe, and the end, away from the filter screen A, of the discharging pipe communicates with the circulating pipe; impurities filtered out by the obliquely arranged filter screen are conveyed into the discharge pipe through the flowing power of the spraying liquid in the circulating pipe, so that the impurities in the spraying liquid in the circulating pipe are filtered out, the nozzle is prevented from being blocked, and the device is simple, efficient, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of washing towers, in particular to a filtering device used in a urea washing tower. Background Art

[0002] Urea scrubber is an important industrial equipment, mainly used in the field of industrial waste gas treatment. In the urea scrubber, the spray liquid is pressurized by the circulation pump and atomized into fine droplets through the nozzle, which come into reverse contact with the gas entering the scrubber, thereby purifying the gas.

[0003] However, impurities such as particulate matter are inevitable in the spray liquid, and the components of the spray liquid mainly include ammonia solution and other related chemical substances produced in the urea production process. During the operation of the urea washing tower, due to changes in solution concentration and temperature, some crystals may precipitate from the spray liquid, causing an increase in particulate matter and other impurities in the spray liquid. If the spray liquid in the circulation pipe of the washing tower contains more impurities, it will often cause the hollow cone nozzle of the spray device to be blocked, affecting the atomization effect of the spray liquid, and thus affecting the purification of the gas. In addition, the hollow cone nozzle is located inside the washing tower, and it is extremely inconvenient to replace and maintain.

[0004] Therefore, a filtering device is needed that can filter impurities from the spray liquid in the circulation pipe of the urea washing tower. Utility Model Content

[0005] The utility model addresses the deficiencies of the prior art and provides a filtering device for a urea washing tower that uses the power of the spray liquid flowing in the circulation pipe to transport impurities filtered out from an inclined filter screen into a discharge pipe, thereby filtering out impurities in the spray liquid in the circulation pipe and avoiding nozzle blockage. The utility model is simple, efficient, safe, reliable and easy to operate.

[0006] The utility model is realized by the following technical scheme, which provides a filtering device for a urea washing tower, comprising a filter screen A arranged in a circulation pipe of the washing tower, the filter screen A being arranged obliquely along the transmission direction of the circulation pipe, and a discharge pipe connected to the circulation pipe being provided at one end of the filter screen A facing the transmission direction of the circulation pipe; a filter screen B being arranged in contact with the inner wall of the discharge pipe being provided in the discharge pipe, and an end of the discharge pipe away from the filter screen A being connected to the circulation pipe; impurities filtered out of the oblique filter screen are transported to the discharge pipe by the power of the flow of spray liquid in the circulation pipe, thereby filtering out impurities in the spray liquid in the circulation pipe and avoiding nozzle clogging.

[0007] As an optimization, the circulation pipe is provided with multiple filter meshes A arranged in sequence along the transmission direction, and the filter holes of the filter meshes A are successively reduced along the transmission direction; the impurities in the spray liquid are filtered step by step through the multiple filter meshes A with successively reduced filter holes, avoiding excessive impurities filtered out by a single filter mesh A at one time, causing blockage of the circulation pipe.

[0008] As an optimization, the end of the discharge pipe close to the filter screen A extends along the extension direction of the filter screen A, and the end of the filter screen A facing the transmission direction of the circulation pipe is adapted to the end of the discharge pipe close to the filter screen A; the adaptation of the discharge pipe and the filter screen A facilitates the transportation of impurities filtered out by the filter screen A into the discharge pipe, thereby avoiding impurities from accumulating at the connection between the filter screen A and the circulation pipe and clogging the circulation pipe.

[0009] As an optimization, the angle between the direction of the end of the discharge pipe away from the filter screen A and the transmission direction of the circulation pipe is less than or equal to 90°; to prevent the spray liquid in the circulation pipe from entering the discharge pipe from the end of the discharge pipe away from the filter screen A, and to prevent the spray liquid flowing out from the end of the discharge pipe away from the filter screen A from causing reverse impact on the spray liquid flowing in the circulation pipe, thereby affecting the flow efficiency of the spray liquid in the circulation pipe.

[0010] As an optimization, the discharge pipe of filter screen B toward the side of filter screen A is connected to a storage tank, and the bottom of the storage tank is located below the discharge pipe; the impurities filtered out by filter screens A and B are stored in the storage tank.

[0011] As an optimization, a collecting hopper is provided at the bottom of the storage tank, a discharge port is provided at the bottom of the collecting hopper, and a sealing valve is provided at the discharge port; impurities in the storage tank are collected by the collecting hopper and discharged through the discharge port.

[0012] The beneficial effects of the present invention are as follows: the impurities filtered out by the inclined filter screen are transported to the discharge pipe by the power of the spray liquid flowing in the circulation pipe, thereby filtering out the impurities in the spray liquid in the circulation pipe and avoiding clogging of the nozzle; the impurities in the spray liquid are filtered step by step by the filter screen A with a plurality of filter holes that shrink in sequence, avoiding excessive impurities filtered out by a single filter screen A at one time, causing clogging of the circulation pipe; the impurities filtered out by the filter screen A are conveniently transported to the discharge pipe by the adaptation of the discharge pipe and the filter screen A, avoiding impurities from accumulating at the connection part between the filter screen A and the circulation pipe, and clogging the circulation pipe; avoiding the spray liquid in the circulation pipe from entering the discharge pipe from the end of the discharge pipe away from the filter screen A, preventing the spray liquid flowing out from the end of the discharge pipe away from the filter screen A from causing reverse impact on the spray liquid flowing in the circulation pipe, affecting the flow efficiency of the spray liquid in the circulation pipe; the impurities filtered out by the filter screen A and the filter screen B are stored in the storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a cross-sectional view of Example 1 of the present utility model;

[0014] Figure 2 for Figure 1 Location diagram in urea scrubber;

[0015] Figure 3 This is a cross-sectional view of Example 2 of the present utility model;

[0016] Figure 4 for Figure 3 Location diagram in urea scrubber;

[0017] As shown in the figure:

[0018] 1. Washing tower, 2. Filter A, 3. Discharge pipe, 4. Filter B, 5. Storage tank, 6. Collecting hopper, 7. Sealing valve, 101. Tower body, 102. Liquid storage tank, 103. Air inlet, 104. Filler, 105. Spraying device, 106. Demisting device, 107. Air outlet, 108. Circulation pipe, 109. Circulation pump. DETAILED DESCRIPTION

[0019] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0020] Example 1:

[0021] like Figure 1 and Figure 2 The filtering device for a urea washing tower of the present invention shown in the figure includes a filter screen A2 arranged in a circulation pipe 108 of the washing tower 1. The filter screen A2 is arranged obliquely along the transmission direction of the circulation pipe 108, and an end of the filter screen A2 facing the transmission direction of the circulation pipe 108 is provided with a discharge pipe 3 connected to the circulation pipe 108; a filter screen B4 is provided in the discharge pipe 3 and is fitted with the inner wall of the discharge pipe 3, and the end of the discharge pipe 3 away from the filter screen A2 is connected to the circulation pipe 108.

[0022] The urea washing tower 1 is of existing technology and includes a tower body 101. The tower body 101 is provided with a liquid storage tank 102, an air inlet 103, a filler 104, a spray device 105, a demisting device 106 and an air outlet 107 arranged in sequence from bottom to top. The liquid storage tank 102 is connected to the spray device 105 through a circulation pipe 108. The circulation pipe 108 is connected to a circulation pump 109. The spray liquid in the liquid storage tank 102 is transported to the spray device 105 through the circulation pump 109 and sprayed out through the nozzle of the spray device 105; the filter A2 is arranged on the circulation pipe 108 between the circulation pump 109 and the spray device 105, and is located at one end close to the spray device 105.

[0023] The spray liquid flows in the circulation pipe 108. When the spray liquid passes through the filter A2, the spray liquid passes through the filter A2, and the impurities in the spray liquid remain on the filter A2; and the impurities slide along the inclined surface of the filter A2 into the discharge pipe 3 under the action of the power of the spray liquid flow; the spray liquid enters the discharge pipe 3, and the impurities in the discharge pipe 3 flow along the discharge pipe 3 driven by the spray liquid until it passes through the filter B4. The spray liquid passes through the filter B4 and re-enters the circulation pipe 108, and the impurities in the spray liquid remain in the discharge pipe 3.

[0024] like Figure 1 The circulation pipe 108 is provided with a plurality of filter screens A2 sequentially arranged along the transmission direction, and the filter holes of the filter screens A2 are successively reduced along the transmission direction.

[0025] The spray liquid flows in the circulation pipe 108 and passes through a plurality of filter screens A2 in sequence. The spray liquid passes through the filter screens A2, and impurities in the spray liquid stay on different filter screens A2 in sequence according to the size of the impurities.

[0026] like Figure 1 As shown, the end of the discharge pipe 3 close to the filter screen A2 extends along the extension direction of the filter screen A2, and the end of the filter screen A2 facing the transmission direction of the circulation pipe 108 is adapted to the end of the discharge pipe 3 close to the filter screen A2; the extension of the end of the filter screen A2 facing the transmission direction of the circulation pipe 108 is tangent to the end of the discharge pipe 3 close to the filter screen A2; the direction of the end of the discharge pipe 3 close to the filter screen A2 forms an angle greater than 90° with the transmission direction of the circulation pipe 108.

[0027] like Figure 1 The angle between the end of the discharge pipe 3 away from the filter screen A2 and the transmission direction of the circulation pipe 108 is less than or equal to 90°; in this embodiment, the angle between the end of the discharge pipe 3 away from the filter screen A2 and the transmission direction of the circulation pipe 108 is less than 90°.

[0028] like Figure 1 The discharge pipe 3 on the side of the filter screen B4 facing the filter screen A2 is connected to the storage tank 5, and the bottom of the storage tank 5 is located below the discharge pipe 3.

[0029] The impurities remaining in the discharge pipe 3 are accumulated in the storage tank 5 .

[0030] like Figure 1 The bottom of the storage tank 5 is provided with a collecting hopper 6 , the bottom of the collecting hopper 6 is provided with a discharge port, and the discharge port is provided with a sealing valve 7 .

[0031] When the sealing valve 7 is closed, the impurities in the storage tank 5 gradually gather in the collecting hopper 6; when the sealing valve 7 is opened, the impurities in the collecting hopper 6 are discharged through the discharge port.

[0032] During the actual production process, the spray liquid flows in the circulation pipe 108, and the spray liquid flows in the circulation pipe 108 and passes through multiple filter screens A2 in turn. The spray liquid passes through the filter screen A2, and the impurities in the spray liquid stay on different filter screens A2 in turn according to the size of the impurities; and the impurities slide along the inclined surface of the filter screen A2 to the discharge pipe 3 under the action of the power of the spray liquid flow; the spray liquid enters the discharge pipe 3, and the impurities in the discharge pipe 3 flow along the discharge pipe 3 driven by the spray liquid until they pass through the filter screen B4, the spray liquid passes through the filter screen B4 and re-enters the circulation pipe 108, the impurities in the spray liquid stay in the discharge pipe 3 and gradually gather in the storage tank 5; the sealing valve 7 is closed, and the impurities in the storage tank 5 gradually gather in the collecting hopper 6; the sealing valve 7 is started, and the impurities in the collecting hopper 6 are discharged through the discharge port.

[0033] Example 2:

[0034] like Figure 3 and Figure 4 As shown, the difference between this embodiment and embodiment 1 is that: in embodiment 1, the connecting portion between the end of the discharge pipe 3 away from the filter screen A2 and the circulation pipe 108 is located on the side of the filter screen A2 facing away from the spray device 105, and the spray liquid flowing out of the discharge pipe 3 will be filtered again by the filter screen A2; in embodiment 2, the connecting portion between the end of the discharge pipe 3 away from the filter screen A2 and the circulation pipe 108 is located on the side of the filter screen A2 facing the spray device 105, and the spray liquid flowing out of the discharge pipe 3 will directly pass through the filter screen A2, thereby reducing the influence of the spray liquid flowing out of the discharge pipe 3 on the spray liquid flowing in the circulation pipe 108.

[0035] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A filtering device for a urea scrubber, characterized in that: The invention comprises a filter screen A (2) arranged in a circulation pipe (108) of a washing tower (1), wherein the filter screen A (2) is arranged obliquely along the transmission direction of the circulation pipe (108), and a discharge pipe (3) connected to the circulation pipe (108) is provided at one end of the filter screen A (2) facing the transmission direction of the circulation pipe (108); a filter screen B (4) is provided in the discharge pipe (3) and is arranged in contact with the inner wall of the discharge pipe (3), and the end of the discharge pipe (3) away from the filter screen A (2) is connected to the circulation pipe (108).

2. The filtering device for a urea scrubber according to claim 1, characterized in that: The circulation pipe (108) is provided with a plurality of filter screens A (2) arranged in sequence along the transmission direction, and the filter holes of the filter screens A (2) are successively reduced along the transmission direction.

3. The filtering device for a urea scrubber according to claim 1, characterized in that: The end of the discharge pipe (3) close to the filter screen A (2) extends along the extension direction of the filter screen A (2), and the end of the filter screen A (2) facing the transmission direction of the circulation pipe (108) is adapted to the end of the discharge pipe (3) close to the filter screen A (2).

4. The filtering device for a urea scrubber according to claim 1, characterized in that: The angle between the direction of the end of the discharge pipe (3) away from the filter screen A (2) and the transmission direction of the circulation pipe (108) is less than or equal to 90 degrees.

5. The filtering device for a urea scrubber according to claim 1, characterized in that: The discharge pipe (3) on the side of the filter screen B (4) facing the filter screen A (2) is connected to the storage tank (5), and the bottom of the storage tank (5) is located below the discharge pipe (3).

6. The filtering device for a urea scrubber according to claim 5, characterized in that: A collecting hopper (6) is provided at the bottom of the storage tank (5), a discharge port is provided at the bottom of the collecting hopper (6), and a sealing valve (7) is provided at the discharge port.

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