Mechanical seal water circulation system of NOX tail gas washing circulating pump

Abstract

A machine seal water circulation system of a NOX tail gas washing circulating pump comprises a tail gas washing tower (1) and a washing circulating pump (2), a spraying pipe (3) and a sedimentation tank (4) are arranged in the tail gas washing tower (1), the spraying pipe (3) and the sedimentation tank (4) are communicated in a circulating mode through the washing circulating pump (2), a branch pipe (5) is arranged on a connecting pipeline between a water outlet of the washing circulating pump (2) and the spraying pipe (3), and the branch pipe (5) is communicated with the washing circulating pump (2). The branch pipe (5) is communicated with a mechanical seal water inlet of the washing circulating pump (2), and a mechanical seal water outlet of the washing circulating pump (2) is communicated with the interior of the tail gas washing tower (1) through a mechanical seal water discharge pipe (6). The mechanical seal water closed-loop circulating system has the advantages that the purposes that the return water of the mechanical seal water is utilized, the NOX tail gas washing circulating pump can operate independently for a long time, and a process condensation pump is not needed to provide the mechanical seal water are achieved through the mechanical seal water closed-loop circulating system, the corresponding technical requirements can be met, and the cost can be effectively saved.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas washing and purification, in particular to a NOX tail gas washing circulating pump sealing water circulation system. Background Art

[0002] At present, the existing NOX exhaust gas washing circulation pump seal water enters the seal water inlet pipe from the process condensate tank through the process condensate pump. The NOX exhaust gas washing circulation pump needs to run uninterruptedly for a long time. During the shutdown of the production equipment, the process condensate pump also needs to run for a long time to provide seal cooling water for the exhaust gas washing pump, resulting in increased energy consumption and increased production costs, which does not meet the current economic and environmental protection production requirements. Utility Model Content

[0003] The purpose of the present invention is to address the above-mentioned deficiencies and to provide a NOX tail gas scrubbing circulating pump sealing water circulation system.

[0004] The utility model comprises a tail gas washing tower and a washing circulation pump. A spray pipe and a sedimentation tank are arranged in the tail gas washing tower. The spray pipe and the sedimentation tank are circulated through the washing circulation pump. A branch pipe is provided on the connecting pipe between the water outlet of the washing circulation pump and the spray pipe. The branch pipe is communicated with the machine seal water inlet of the washing circulation pump. The machine seal water drain outlet of the washing circulation pump is communicated with the tail gas washing tower through the machine seal drain pipe.

[0005] A filter box connected to the sedimentation tank is provided on one side of the tail gas washing tower, and the water inlet of the washing circulation pump is connected to the filter box.

[0006] A mesh plate is provided in the filter box, and a filler filter layer is provided on the mesh plate. The sedimentation tank is communicated with the filter box below the filler filter layer, and the water inlet of the washing circulation pump is communicated with the filter box above the filler filter layer.

[0007] A drain valve is provided on the filter box below the filler filter layer.

[0008] A water supply pipe is provided on the top of the filter box.

[0009] The sedimentation tank and the filter box are connected through a conveying pipeline, and a valve is provided on the conveying pipeline.

[0010] The utility model has the advantages that the machine seal water closed-circuit circulation system is used to achieve the return of the machine seal water, the NOx tail gas washing circulation pump can run alone for a long time, and there is no need for a process condensation pump to provide the machine seal water, which can not only meet the corresponding technical requirements but also effectively save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the utility model.

[0012] Figure 2 It is a schematic diagram of the machine seal water circulation of the washing circulation pump of the utility model. DETAILED DESCRIPTION

[0013] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0015] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the utility model is usually placed when in use. This is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, if the terms "first", "second", etc. appear in the description of the present invention, they are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0016] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0017] As shown in the accompanying drawings, the utility model includes a tail gas washing tower 1 and a washing circulation pump 2. A spray pipe 3 and a sedimentation tank 4 are provided in the tail gas washing tower 1. The spray pipe 3 and the sedimentation tank 4 are circulated through the washing circulation pump 2. A branch pipe 5 is provided on the connecting pipe between the water outlet of the washing circulation pump 2 and the spray pipe 3. The branch pipe 5 is communicated with the machine seal water inlet of the washing circulation pump 2. The machine seal water drain outlet of the washing circulation pump 2 is communicated with the tail gas washing tower 1 through the machine seal drain pipe 6.

[0018] The water in the sedimentation tank 4 is transported to the spray pipe 3 for circulation through the washing circulation pump 2. At the same time, part of the water output from the washing circulation pump 2 enters the mechanical seal water tank of the washing circulation pump 2 from the branch pipe 5 and is used as the mechanical seal water of the washing circulation pump 2. The mechanical seal water of the washing circulation pump 2 then flows back to the exhaust gas washing tower 1 from the outlet. The mechanical seal water is returned to the exhaust gas washing tower 1 through the closed-loop circulation system of the mechanical seal water. The NOX exhaust gas washing circulation pump can run alone for a long time without the need for the process condensate pump to provide mechanical seal water. It can not only meet the corresponding technical requirements, but also effectively save costs. The existing process condensate pump has a power of 18.5KW. Based on 61 days of parking in 2023, about 27,084 kWh of electricity can be saved.

[0019] Furthermore, a filter box 9 communicating with the sedimentation tank 4 is provided on one side of the tail gas washing tower 1 , and a water inlet of the washing circulation pump 2 is communicated with the inside of the filter box 9 .

[0020] The filter box 9 is used to filter the water in the sedimentation tank 4 to prevent impurities from causing wear to the washing circulation pump 2 , the mechanical seal components of the washing circulation pump 2 , and the spray pipe 3 .

[0021] Furthermore, a mesh plate 10 is provided in the filter box 9, and a filler filter layer 11 is provided on the mesh plate 10. The sedimentation tank 4 is communicated with the filter box 9 located below the filler filter layer 11, and the water inlet of the washing circulation pump 2 is communicated with the filter box 9 located above the filler filter layer 11.

[0022] The mesh plate 10 is used to support and fix the filler filter layer 11. The filler filter layer 11 in this case is made of glass fiber cotton. After the water from the sedimentation tank 4 enters the filter box 9, it is first filtered through the filler filter layer 11 and enters the upper part of the filter box 9. Then the washing circulation pump 2 pumps out the filtered water for recycling.

[0023] Furthermore, a drain valve 13 is provided on the filter box 9 located below the filler filter layer 11 .

[0024] A water supply pipe 14 is provided on the top of the filter box 9 .

[0025] The sedimentation tank 4 and the filter box 9 are connected through a delivery pipe 15 , and a valve is provided on the delivery pipe 15 .

[0026] The drain valve 13 is used to drain the filter box 9. Before draining, close the valves on the washing circulation pump 2 and the delivery pipe 15, open the drain valve 13, and the water in the filter box 9 is discharged from the drain valve 13. During the drainage process, the water on the upper part of the filter box 9 can backwash the filler filter layer 11.

[0027] The water supply pipe 14 is used to supply water to the filter box 9, and the washing circulation pump 2 maintains the liquid level height in the filter box 9 when in working state.

Claims

1. A NOX tail gas scrubbing circulating pump sealing water circulation system, characterized in that The invention comprises an exhaust gas washing tower (1) and a washing circulation pump (2). A spray pipe (3) and a sedimentation tank (4) are provided in the exhaust gas washing tower (1). The spray pipe (3) and the sedimentation tank (4) are circulated and communicated with each other through the washing circulation pump (2). A branch pipe (5) is provided on the connecting pipe between the water outlet of the washing circulation pump (2) and the spray pipe (3). The branch pipe (5) is communicated with the machine seal water inlet of the washing circulation pump (2). The machine seal water drain outlet of the washing circulation pump (2) is communicated with the exhaust gas washing tower (1) through the machine seal drain pipe (6).

2. A NOX tail gas scrubbing circulating pump sealing water circulation system according to claim 1, characterized in that A filter box (9) communicating with the sedimentation tank (4) is provided on one side of the tail gas washing tower (1), and a water inlet of the washing circulation pump (2) is communicated with the inside of the filter box (9).

3. A NOX tail gas scrubbing circulating pump sealing water circulation system according to claim 2, characterized in that A mesh plate (10) is provided in the filter box (9), and a filler filter layer (11) is provided on the mesh plate (10). The sedimentation tank (4) is communicated with the filter box (9) located below the filler filter layer (11), and the water inlet of the washing circulation pump (2) is communicated with the filter box (9) located above the filler filter layer (11).

4. A NOX tail gas scrubbing circulating pump sealing water circulation system according to claim 3, characterized in that A sewage valve (13) is provided on the filter box (9) located below the filler filter layer (11).

5. A NOX tail gas scrubbing circulating pump sealing water circulation system according to claim 3, characterized in that A water supply pipe (14) is provided on the top of the filter box (9).

6. A NOX tail gas scrubbing circulating pump sealing water circulation system according to claim 3, characterized in that The sedimentation tank (4) and the filter box (9) are connected via a delivery pipe (15), and a valve is provided on the delivery pipe (15).

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