Black water filtering device of high-pressure flash tank

Abstract

The utility model discloses a high-pressure flash tank black water filtering device which comprises a high-pressure flash tank, a filter and a low-pressure flash tank, the lower end of the high-pressure flash tank is connected with a black water pipeline, and the output end of the black water pipeline is connected to an inlet pipeline of the filter. An outlet pipeline at the other end of the filter is communicated with a low-pressure flash tank through a black water angle valve, an inclined plate filter screen is arranged in the filter, a filter front hand valve is mounted on an inlet pipeline of the filter, the filter is used for filtering scale pieces in the high-pressure flash tank, and black water is discharged through a subline valve after the filter is full of the scale pieces. Cutting out and cleaning the filter, and putting into use after cleaning; if black water discharge is seriously influenced by dust deposition and scaling at the conical part of the high-pressure flash tank due to long operation cycle, the black water can be discharged through a standby pipeline in the middle of the high-pressure flash tank, so that stable operation of production can be conveniently maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of flash tanks, in particular to a black water filtering device for a high-pressure flash tank. Background Art

[0002] According to the requirements of coal chemical industry and power generation process, the aerospace furnace device adopts the technical process of dry feeding and wet dust removal. Three-stage flash evaporation is used in black water treatment. The flash evaporation process recovers heat and concentrates black water at the same time. As an important equipment in the black water treatment process, the high-pressure flash tank is responsible for the flash evaporation of black water discharged from the gasifier, cyclone separator, and scrubber, while taking into account the external supply of steam after black water flash evaporation and the external delivery of concentrated black water. After the high-pressure flash tank has been running for a period of time, due to the high solid content of black water, the inner wall, cone and pipeline black water of the pipe are prone to form scale flakes, which affect the stable transportation of black water. At the same time, the ash accumulation in the cone of the high-pressure flash tank gradually increases, affecting the normal operation of the high-pressure flash tank; especially when the system temperature changes, it is very easy to cause the scale flakes to fall off and accumulate in the cone of the high-pressure flash tank, causing the black water pipeline and angle valve to be blocked, and the black water cannot be delivered normally and continuously, thereby affecting the safe and stable operation of production. In severe cases, it may cause the system to shut down.

[0003] Therefore, it is necessary to invent a high-pressure flash tank black water filtration device to solve the problem that scale flakes fall off due to changes in system temperature and other factors, accumulate in the cone of the high-pressure flash tank, cause blockage of the black water pipeline and angle valve, and the black water cannot be delivered normally and continuously, thereby affecting the safe and stable operation of production, and in severe cases may cause system shutdown incidents. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a high-pressure flash tank black water filtration device to solve the problem that scale flakes may fall off due to changes in system temperature and other factors, affecting the safe and stable operation of production, and in severe cases may cause system shutdown events.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-pressure flash tank black water filtering device, comprising a high-pressure flash tank, a filter and a low-pressure flash tank, the lower end of the high-pressure flash tank is connected to a black water pipeline, and the output end of the black water pipeline is connected to the inlet pipeline of the filter, the outlet pipeline at the other end of the filter is connected to the low-pressure flash tank through a black water angle valve, an inclined plate filter is provided inside the filter, a filter front hand valve is installed on the inlet pipeline of the filter, a filter rear hand valve is installed on the inlet and outlet pipelines of the filter, the lower end of the black water pipeline is also connected to a filter sub-line, and the other end of the filter sub-line is connected to the outlet pipeline of the filter, a filter first sub-line valve is provided at the front end of the filter sub-line, and a filter second sub-line valve is provided at the rear end of the filter sub-line, a black water discharge standby pipeline is provided on the outlet pipeline of the filter, a standby pipeline flushing water pipeline is provided on the black water discharge standby pipeline, and the other end of the black water discharge standby pipeline is connected to the high-pressure flash tank.

[0006] As a preferred technical solution of the utility model, a filter valve is provided at the upper end of the filter, and the upper end of the filter valve is connected to a filter exhaust pipeline.

[0007] As a preferred technical solution of the utility model, the filter and the filter valve are connected via a flange.

[0008] As a preferred technical solution of the utility model, a filter inspection hole is provided on one side of the bottom of the filter.

[0009] As a preferred technical solution of the utility model, the filter front hand valve and the filter rear hand valve are both in two groups.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model provides a high-pressure flash tank black water filtering device. Compared with the existing technology, it has the following beneficial effects:

[0012] 1. Eliminate the problem of scale flakes falling off the high-pressure flash tank blocking the pipeline and angle valve affecting production events.

[0013] 2. The design is simple to operate, clean and maintain.

[0014] Other features and advantages of the present invention will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] In the figure: 1. high-pressure flash tank, 2. black water pipeline, 3. filter, 4. black water angle valve, 5. low-pressure flash tank, 6. filter front hand valve, 7. filter rear hand valve, 8. filter sub-line, 91. filter first sub-line valve, 92. filter second sub-line valve, 10. inclined plate filter, 11. filter valve, 12. filter exhaust pipeline, 13. filter inspection hole, 14. black water discharge spare pipeline, 15. spare pipeline flushing water pipeline. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] See also Figure 1In the present embodiment, a high-pressure flash tank black water filtering device is provided, comprising a high-pressure flash tank 1, a filter 3 and a low-pressure flash tank 5. The lower end of the high-pressure flash tank 1 is connected to a black water pipeline 2, and the output end of the black water pipeline 2 is connected to the inlet pipeline of the filter 3. The filter 3 is a cylindrical pressure vessel, which is consistent with the pressure level of the high-pressure flash tank 1. The outlet pipeline at the other end of the filter 3 is connected to the low-pressure flash tank 5 through a black water angle valve 4. An inclined plate filter 10 is provided inside the filter 3. The inclined plate filter of the filter is set as circular holes, which are evenly distributed. Considering the through diameter of the black water angle valve 4, the size of the filter mesh should be relatively reasonable. A filter front hand valve 6 is installed on the inlet pipeline of the filter 3, and a filter rear hand valve 7 is installed on the inlet and outlet pipelines of the filter 3. The filter front hand valve 6 and the filter rear hand valve 7 are both There are two groups of valves, both of which are controlled by double valves. The valves use gate valves or ball valves to reduce flow resistance. The lower end of the black water pipeline 2 is also connected to a filter sub-line 8, and the other end of the filter sub-line 8 is connected to the outlet pipeline of the filter 3. The front end of the filter sub-line 8 is provided with a first filter sub-line valve 91, and the rear end of the filter sub-line 8 is provided with a second filter sub-line valve 92, wherein the distance between the first filter sub-line valve 91 and the second filter sub-line valve 92 and the main line is shortened to the maximum extent to reduce the probability of dust accumulation on the valves and pipelines. A black water discharge standby pipeline 14 is provided on the outlet pipeline of the filter 3, and a standby pipeline flushing water pipeline 15 is provided on the black water discharge standby pipeline 14, and the other end of the black water discharge standby pipeline 14 is connected to the high-pressure flash tank 1. During the pipeline standby period, the standby pipeline flushing water pipeline 15 is always open.

[0021] The upper end of the filter 3 is provided with a filter valve 11 , and the upper end of the filter valve 11 is connected with a filter exhaust pipeline 12 .

[0022] In order to facilitate disassembly and maintenance, the filter 3 and the filter valve 11 are connected via a flange.

[0023] A filter inspection hole 13 is provided at one side of the bottom of the filter 3 .

[0024] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0025] When in use, open the filter front hand valve 6 and the filter rear hand valve 7 of the filter 3, and put the filter 3 into use. To avoid blockage of the black water angle valve 4, preset a certain opening of the black water angle valve 4 in advance. During the use of the filter 3, the filter first sub-line valve 91 and the filter second sub-line valve 92 of the filter sub-line 8 are closed, and the spare pipeline flushing water pipeline 15 is opened to flush the pipeline to avoid ash accumulation and scaling blocking the pipeline and preventing normal standby. Once the high-pressure flash tank liquid level 1 fluctuates abnormally and rises, it may generally be caused by the blockage of the filter 3. At this time, the spare filter sub-line 8 needs to be put into use. The operation can be maintained by putting the filter sub-line 8 into use. If the black water pipeline 2 is blocked and continues to cause blockage, the black water discharge spare pipeline 14 is activated at this time. When the black water discharge spare pipeline 14 is activated, after the parameters are stable, the flushing water is turned off and the filter 3 is removed. Close the double valves before and after the filter 3, open the filter valve 11 of the top filter exhaust pipeline 12, and confirm that the pressure relief is complete before cleaning. Remove the scale and other foreign objects from the hand hole and clean them before re-use. If the cleaning effect through the hand hole is not good, remove the upper flange for cleaning. After the filter 3 is put into use, close the valve of the standby black water discharge standby pipeline 14, open the two flushing valves on the standby pipeline flushing water pipeline 15, and use flushing water. Eliminate the hidden danger of operation safety caused by the fall of scale flakes in the high-pressure flash tank blocking the pipeline.

[0026] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A high-pressure flash tank black water filtration device, characterized in that: The invention comprises a high-pressure flash tank (1), a filter (3) and a low-pressure flash tank (5), wherein the lower end of the high-pressure flash tank (1) is connected to a black water pipeline (2), and the output end of the black water pipeline (2) is connected to the inlet pipeline of the filter (3), the outlet pipeline of the other end of the filter (3) is connected to the low-pressure flash tank (5) via a black water angle valve (4), an inclined plate filter (10) is provided inside the filter (3), a filter front hand valve (6) is installed on the inlet pipeline of the filter (3), a filter rear hand valve (7) is installed on the inlet and outlet pipelines of the filter (3), and the black water pipeline (2) is connected to the inlet pipeline of the filter (3). The lower end of the water pipeline (2) is also connected to a filter sub-line (8), and the other end of the filter sub-line (8) is connected to the outlet pipeline of the filter (3). A first filter sub-line valve (91) is provided at the front end of the filter sub-line (8), and a second filter sub-line valve (92) is provided at the rear end of the filter sub-line (8). A black water discharge standby pipeline (14) is provided on the outlet pipeline of the filter (3), a standby pipeline flushing water pipeline (15) is provided on the black water discharge standby pipeline (14), and the other end of the black water discharge standby pipeline (14) is connected to the high-pressure flash tank (1).

2. A high-pressure flash tank black water filtration device according to claim 1, characterized in that: A filter valve (11) is provided at the upper end of the filter (3), and a filter exhaust pipeline (12) is connected to the upper end of the filter valve (11).

3. A high-pressure flash tank black water filtration device according to claim 2, characterized in that: The filter (3) and the filter valve (11) are connected via a flange.

4. The high-pressure flash tank black water filtration device according to claim 1, characterized in that: A filter inspection hole (13) is provided on one side of the bottom of the filter (3).

5. The high-pressure flash tank black water filtration device according to claim 1, characterized in that: The filter front hand valve (6) and the filter rear hand valve (7) are both in two groups.

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