Siphon device for preventing conical bottom of scrubbing tower of gasification device from being blocked

Abstract

The invention provides a siphon device for preventing the conical bottom of a scrubbing tower of a gasification device from being blocked, which comprises a main black discharge pipeline arranged at the outlet of the conical bottom of the scrubbing tower, and a first valve is arranged on the main black discharge pipeline; the negative pressure tank is connected to the outlet end of the main black discharge pipeline, a first sewage receiving pool is arranged below an outlet pipeline of the negative pressure tank, a second valve is arranged at the bottom of the negative pressure tank, and a one-way exhaust valve and a pressure sensor are further arranged at the top of the negative pressure tank; the siphon pipe is vertically arranged at the conical bottom of the washing tower and is communicated with the main black discharge pipeline through a flange; according to the scheme, the siphon is additionally arranged at the conical bottom of the washing tower, the negative pressure tank connected with the total black discharging pipeline forms a continuous siphon effect, liquid obtained after washing is discharged from a pipe opening above the siphon, the frequency of blockage of the conical bottom of the washing tower is remarkably reduced, the number of times of shutdown cleaning is reduced, meanwhile, the negative pressure tank forms a negative pressure state in the water discharging process, and the service life of the washing tower is prolonged. Dependence of an external negative pressure pump is reduced, and automatic siphon effect of the device is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of preventing washing tower from being blocked, and particularly relates to a siphon device for preventing the conical bottom of a washing tower of a gasification device from being blocked. BACKGROUND

[0002] In a coal gasification process, during the feeding and continuous feeding stages of the gasification furnace, due to the sharp change of the medium temperature, the scale pieces attached to the inner wall of the washing tower and the synthetic gas pipeline will fall off in large quantities and enter the conical bottom of the washing tower with the slag water. In the prior art, the fallen scale pieces are mixed with fine slag and are prone to accumulate at the outlet of the total black discharge pipeline of the conical bottom, causing the pipeline to be blocked. Once the pipeline is blocked, manual cleaning and dredging can only be carried out after the device is stopped, which not only seriously affects the progress of the start-up, but also brings great safety risks due to the high-temperature, high-humidity and toxic medium working environment. If the washing tower is replaced by a side discharge pipeline, the slag will accumulate seriously at the bottom of the tower during the maintenance period, and the manual cleaning in the limited space is low in efficiency and high in risk.

[0003] Chinese public patent CN218579894U discloses a gasification washing tower slag and black water discharge system, which is provided with a slag discharge tank at the lower part of the washing tower. Through the action of system pressure, in combination with various valves and the slag discharge tank, the system is used in the initial pressure increasing stage of the gasification furnace to carry out multiple cycles of slag discharge and collection. However, the device only discharges slag under the action of system pressure, and the total black discharge pipeline will be blocked under the condition that the pressure does not change after continuous feeding, so the device cannot achieve continuous slag discharge.

[0004] Chinese public patent CN204919761U discloses an automatic siphon flushing system for sewage pipelines, which is provided with an inserted siphon pipe to collect rainwater and domestic sewage or process sewage for flushing to prevent the formation of odor. However, the device is only suitable for flushing in small pipelines, and if the device is connected to a large washing tower, an external negative pressure pump is needed to promote the generation of siphon effect. SUMMARY

[0005] The siphon device for preventing the conical bottom of the washing tower of the gasification device from being blocked is provided to solve the problem of low slag discharge efficiency caused by insufficient siphon effect during the continuous slag discharge of the total black discharge pipeline of the conical bottom of the existing washing tower.

[0006] In order to solve the above problems, the siphon device for preventing the conical bottom of the washing tower of the gasification device from being blocked comprises a total black discharge pipeline installed at the outlet of the conical bottom of the washing tower, and a first valve is arranged on the total black discharge pipeline. The device further comprises a negative pressure tank connected to the outlet end of the total black discharge pipeline, a first sewage receiving pool arranged below the outlet pipeline of the negative pressure tank, a second valve arranged at the bottom of the negative pressure tank, a one-way exhaust valve and a pressure sensor arranged at the top of the negative pressure tank, and a siphon pipe vertically installed at the conical bottom of the washing tower, which is connected to the total black discharge pipeline through flanges. By the above scheme, the siphon pipe is added to the washing tower cone bottom, and the negative pressure tank connected with the total black discharge pipeline forms a continuous siphon effect. The liquid after washing is discharged from the upper pipe opening of the siphon pipe, which significantly reduces the frequency of the washing tower cone bottom blockage and reduces the number of parking cleaning. At the same time, the drainage process makes the negative pressure tank form a negative pressure state, reduces the dependence on the external negative pressure pump, and realizes the automatic siphon effect of the device.

[0007] Further, in order to realize the siphon effect and prevent the falling scale accumulated in the washing tower cone bottom from easily blocking the pipe opening, the height of the siphon pipe is one fourth to one third of the height of the washing tower cone bottom.

[0008] Further, in order to prevent the large particle scale from blocking the upper pipe opening of the siphon pipe, a horizontally arranged baffle is welded and fixed on the upper pipe opening of the siphon pipe by a plurality of stainless steel support rods. The bottom diameter of the baffle is greater than the pipe opening diameter of the siphon pipe.

[0009] Further, in order to reduce the phenomenon of the washing tower cone bottom blockage accumulation, the upper four fifths of the pipe wall of the siphon pipe is uniformly arranged with through holes.

[0010] Further, in order to prevent the large particle scale from blocking the through holes, a coaxial flow guide cylinder with an opening downward is sleeved on the upper pipe opening of the siphon pipe.

[0011] Preferably, the upper bottom inner wall of the coaxial flow guide cylinder is welded and fixed on the upper pipe opening of the siphon pipe by a stainless steel support rod. The inner wall of the coaxial flow guide cylinder and the outer wall of the siphon pipe form an annular gap. The length of the coaxial flow guide cylinder is two thirds of the length of the siphon pipe.

[0012] Further, in order to improve the drainage efficiency of the siphon effect, the total black discharge pipeline is further connected with a main black discharge pipeline channel.

[0013] Further, the horizontal section port of the main black discharge pipeline channel is in communication with the total black discharge pipeline. The vertical section port is in communication with a connecting pipe and a vertical blowdown pipe through a three-way valve. One end of the connecting pipe is in communication with the negative pressure tank. The outlet end of the vertical blowdown pipe is arranged above the second sewage receiving pool. The installation height of the three-way valve is lower than the height of the one-way exhaust valve.

[0014] Preferably, the horizontal section of the main black discharge pipeline channel includes at least two U-shaped bend pipes.

[0015] In order to further realize the drainage efficiency of the siphon effect, the pressure sensor is electrically connected with the controller. The controller electrically controls the opening and closing of the first valve, the second valve, the three-way valve and the one-way exhaust valve according to the feedback signal of the pressure sensor.

[0016] The technical effect of the present application is that: The siphon device for preventing the blockage of the conical bottom of the washing tower of the gasification device provided by the application has the advantages that the siphon pipe is added to the conical bottom of the washing tower, the siphon effect is formed with the L-shaped total black gas discharge pipeline, the liquid after washing is discharged from the upper pipe opening of the siphon pipe, the device is simple and efficient, the frequency of the blockage of the conical bottom of the washing tower is significantly reduced, the number of parking and cleaning is reduced, the negative pressure tank forms a negative pressure state in the drainage process, the dependence on the external negative pressure pump is reduced, and the siphon effect is realized automatically. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the overall structure schematic diagram of the siphon device for preventing the blockage of the conical bottom of the washing tower of the gasification device provided by the application.

[0018] Figure 2 is the overall structure schematic diagram of the siphon device for preventing the blockage of the conical bottom of the washing tower of the gasification device provided by the application. Figure 1 is the enlarged structure schematic diagram of the position A in the siphon device for preventing the blockage of the conical bottom of the washing tower of the gasification device provided by the application.

[0019] Figure 3 is the overall structure schematic diagram of the second embodiment of the siphon device for preventing the blockage of the conical bottom of the washing tower of the gasification device provided by the application.

[0020] Figure 4 is the cross-sectional structure schematic diagram of the siphon device in the second embodiment of the siphon device for preventing the blockage of the conical bottom of the washing tower of the gasification device provided by the application.

[0021] BRIEF DESCRIPTION OF DRAWINGS 1, siphon pipe; 110, siphon pipe wall; 120, baffle; 130, support rod; 140, coaxial flow guide cylinder; 150, through hole; 160, annular gap; 2, conical bottom of washing tower; 3, total black gas discharge pipeline; 310, first valve; 320, reducing pipeline; 4, main black gas discharge pipeline; 410, three-way valve; 420, vertical blowdown pipe; 5, negative pressure tank; 510, second valve; 520, one-way exhaust valve; 530, air inlet; 6, connecting pipe; 7, first sewage receiving pool; 8, second sewage receiving pool. DETAILED DESCRIPTION

[0022] The specific embodiments of the technical scheme of the application will be described in detail below with reference to the accompanying drawings. Figures 1-3 The embodiments of the technical scheme of the application are described in detail. The following embodiments are only used to more clearly illustrate the technical scheme of the application, and therefore only serve as examples, and cannot limit the protection scope of the application.

[0023] Embodiment one Reference Figure 1The present application provides a siphon device for preventing the blockage of the conical bottom of a scrubbing tower of a gasification device, which is used to solve the problem that the total black discharge pipeline of the conical bottom of the scrubbing tower is easily blocked by scale pieces and needs to be frequently stopped for manual cleaning, and comprises a total black discharge pipeline 3, a negative pressure tank 5 connected to the outlet end of the total black discharge pipeline 3, and a first sewage receiving pool 7 arranged below the outlet pipeline of the negative pressure tank 5; further comprising a siphon pipe 1 vertically installed above the inlet of the total black discharge pipeline 3 of the conical bottom 2 of the scrubbing tower, which is connected to the total black discharge pipeline 3 by flanges, and the total black discharge pipeline 3 is provided with a first valve 310, the bottom of the negative pressure tank 5 is provided with a second valve 510, and the top of the negative pressure tank 5 is further provided with a one-way exhaust valve 520 and a pressure sensor. The material of the siphon pipe 1 is stainless steel, and the length of the siphon pipe 1 is one fourth to one third of the vertical height of the conical bottom 2 of the scrubbing tower.

[0024] Through the above-mentioned scheme, the siphon pipe 1 is added to the conical bottom 2 of the scrubbing tower, and the negative pressure tank 5 connected to the total black discharge pipeline 3 forms a continuous siphon effect, so that the liquid after washing is discharged from the upper pipe opening of the siphon pipe 1, which significantly reduces the frequency of the blockage of the conical bottom 2 of the scrubbing tower and reduces the number of cleaning stops.

[0025] Further, in order to prevent the large particle scale pieces from blocking the upper pipe opening of the siphon pipe 1, the upper pipe opening of the siphon pipe 1 is provided with a horizontally arranged baffle 120 welded and fixed by four stainless steel supporting rods 130 in the present embodiment, the baffle 120 is a conical stainless steel plate, the tip of which forms a conical structure upward, and the diameter of the conical bottom of the baffle 120 is greater than the diameter of the pipe opening of the siphon pipe 1.

[0026] Further, in order to reduce the accumulation of the blockage of the conical bottom 2 of the scrubbing tower, the upper four fifths of the pipe wall of the siphon pipe 1 is uniformly provided with through holes 150 in the present embodiment, the diameter of the through holes 150 is 8-10 mm, and the through holes 150 allow the fine slag to pass through and be discharged in batches, thereby preventing the accumulation of the slag in the conical bottom 2 of the scrubbing tower from causing blockage during continuous casting.

[0027] In order to further realize the drainage efficiency of the siphon effect, the pressure sensor is electrically connected to the controller, and the controller electrically controls the first valve 310, the second valve 510 and the one-way exhaust valve 520 according to the feedback signal of the pressure sensor. The use of the controller to electrically connect each component and control the on-off of each valve is a conventional setting mode of those skilled in the art, and those skilled in the art have the motivation to integrate the coordinated components involved in the controller into the device of the present application to realize the valve control of the present application.

[0028] When the gasification device is started, the water after washing flows to the conical bottom 2 of the scrubbing tower, the scale pieces falling from the inner wall of the scrubbing tower and the synthetic gas pipeline slide along the tower wall to the conical bottom 2, the large particle scale pieces are blocked by the outer wall of the siphon pipe 1 and accumulated at the edge of the conical bottom 2 of the scrubbing tower, and the fine slag enters the inside of the siphon pipe 1 through the through holes 150 and is discharged through the total black discharge pipeline 3; Before the initial siphon effect occurs, when the water level has not reached the height of the baffle 120, the through hole 150 is exposed to the atmosphere. The continuous air intake prevents the formation of negative pressure in the main black discharge pipeline 3, which is in a low water level stage. The controller controls the opening of the first valve 310 and the one-way exhaust valve 520, and closes the second valve 510. This allows a large amount of sludge and water in the main black discharge pipeline 3 to be discharged into the negative pressure tank 5 due to its own gravity during the overflow stage. At the same time, the gas in the negative pressure tank 5 is discharged through the one-way exhaust valve 520. When the negative pressure tank 5 is full of sludge and water, there is less air inside the negative pressure tank 5. At this time, close the sludge and water inflow valve (not shown in the figure) and the one-way exhaust valve 520 at the top of the negative pressure tank 5, and open the second valve 510. The sludge and water in the negative pressure tank 5 will flow into the first sewage receiving pool 7 under the action of gravity. At this time, the space formed by the negative pressure tank 5 will gradually become a negative pressure state. At this time, the negative pressure state of the negative pressure tank 5 can open the sludge and water inflow valve to generate a siphon effect for the main discharge black pipeline 4. The sludge and water will continue to be discharged into the first sewage receiving pool 7 through the negative pressure tank 5.

[0029] When the sludge and water at the bottom of the scrubbing tower cone 2 are only a small amount and the water level is much lower than the baffle 120, the siphon effect ends due to the entry of air into the main black discharge pipeline 3. At this time, the sludge and water is discharged by the negative pressure tank 5. Specifically, first, the main black discharge pipeline 3 is connected to the negative pressure tank 5, and the second valve 510 is closed. The one-way exhaust valve 520 is opened, allowing the sludge and water to overflow into the negative pressure tank 5. After the negative pressure tank 5 is full of sludge and water, the sludge and water inflow valve (not shown in the figure) and the one-way exhaust valve 520 are closed. After the second valve 510 is opened, the sludge and water in the negative pressure tank 5 flows into the first sludge receiving pool 7 under the action of gravity. At this time, the space formed by the negative pressure tank 5 will gradually become a negative pressure state. The negative pressure state of the negative pressure tank 5 is used again to generate a siphon effect in the main black discharge pipeline.

[0030] When the gasification unit is in the continuous feeding stage, when the water level of the slag water gradually exceeds the height of the baffle 120, the slag water flows into the main black discharge pipeline 3 and gradually switches from the overflow state to the siphon state. At this time, the main black discharge pipeline 4 is used to discharge slag using the siphon effect. For details of the slag discharge process, please refer to Example 2.

[0031] Example 2 See attached document Figure 3 and attached Figure 4 According to the above embodiment one, this application also provides a second embodiment of a siphon device for preventing blockage of the cone bottom of the gasification unit washing tower. In order to prevent large particles of scale from accumulating and blocking the through hole, a coaxial guide tube 140 with an opening facing downward is sleeved above the pipe opening of the siphon pipe 1 provided in this embodiment.

[0032] The upper end of the siphon 1 is welded with the upper bottom wall of the coaxial flow guide 140 through the stainless steel support rod 130, the inner wall of the coaxial flow guide 140 and the outer wall of the siphon 1 form an annular gap 160, and the length of the coaxial flow guide 140 is two-thirds of the length of the siphon 1.

[0033] The variable-diameter pipeline 320 is connected between the washing tower cone bottom 2 and the total black water discharge pipeline 3 to form a Venturi effect, and the variable-diameter pipeline 320 generates a local low pressure when the siphon is started, thereby further improving the discharge efficiency.

[0034] In order to improve the siphon effect of the drainage efficiency, the total black water discharge pipeline 3 is further connected with the main black water discharge pipeline 4.

[0035] Further, the horizontal section port of the main black water discharge pipeline 4 is communicated with the total black water discharge pipeline 3, the vertical section port is communicated with the connecting pipe 6 of the negative pressure tank 5 and the vertical sewage pipe 420 through the three-way valve 410, the outlet end of the vertical sewage pipe 420 is arranged above the second sewage pool 7, and the installation height of the three-way valve 410 is lower than the height of the one-way exhaust valve 520 of the negative pressure tank 5.

[0036] Further, in order to realize high-efficiency black water discharge, the three-way valve is electrically connected with the controller, and the controller controls the opening and closing of the three-way valve according to the feedback signal of the pressure sensor.

[0037] In order to avoid that the negative pressure tank 5 inhales the gas in the main black water discharge pipeline 4 when inhaling the black water, the horizontal section of the main black water discharge pipeline 4 includes at least two U-shaped bend pipelines, so that the sludge water cannot enter the vertical section in the U-shaped bend pipeline when the main black water discharge pipeline is in a negative pressure state.

[0038] Working principle: When the negative pressure tank 5 is filled with sludge water, there is less air in the negative pressure tank 5. At this time, the sludge water on the top of the negative pressure tank 5 flows into the valve (not shown in the figure) and the one-way exhaust valve 520, and after the second valve 510 is opened, the sludge water in the negative pressure tank 5 flows into the first sewage pool 7 under the action of gravity, at this time, the space formed by the negative pressure tank 5 will gradually become a negative pressure state, at this time, the negative pressure tank 5 is in a negative pressure state.

[0039] At this time, the three-way valve 410 is switched to the "negative pressure tank 5-main black discharge pipeline 4" communication position, so that the negative pressure tank 5 and the main black discharge pipeline 4 are communicated through the connecting pipe 6, and the outlet of the main black discharge pipeline 4 is closed. At the same time, the negative pressure state in the negative pressure tank 5 will absorb the air in the main black discharge pipeline 4, so that the main black discharge pipeline 4 gradually becomes a negative pressure state, and further makes the main black discharge pipeline 4 produce a siphon effect. When the slag water flows from the main black discharge pipeline 4 to the outlet of the main black discharge pipeline 4, the three-way valve 410 is switched to the "main black discharge pipeline 4-vertical blowdown pipe 420" communication position, so that the outlet of the vertical blowdown pipe 420 is opened and the connecting pipe 6 is closed. At this time, the main black discharge pipeline 4 will continue to discharge the slag water of the washing tower cone bottom 2 through the main black discharge pipeline 4 by using the siphon effect to the second sewage receiving tank 8. After the siphon effect ends, the liquid level of the washing tower cone bottom 2 drops, and the slag water in the total black discharge pipeline 3 is in an overflow state. The slag water is discharged by the negative pressure tank 5, and the cycle is repeated. Through the technical solution of the present application, the device can automatically realize the siphon effect without relying on an external negative pressure pump.

[0040] The above examples are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for part or all of the technical features. The modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A siphon device for preventing blockage at the bottom of a gasification unit's scrubbing tower cone, comprising a main black discharge pipeline (3) installed at the outlet of the bottom (2) of the scrubbing tower cone, wherein a first valve (310) is provided on the main black discharge pipeline (3). Its features are, Also includes: A negative pressure tank (5) is connected to the outlet end of the main black discharge pipeline (3). A first sewage receiving pool (7) is provided below the outlet pipe of the negative pressure tank (5). A second valve (510) is provided at the bottom of the negative pressure tank (5). A one-way exhaust valve (520) and a pressure sensor are also provided at the top of the negative pressure tank (5). A siphon pipe (1) is vertically installed at the bottom (2) of the washing tower cone, and the siphon pipe (1) is connected to the main black discharge pipeline (3).

2. The siphon device for preventing blockage at the bottom of the washing tower of a gasification unit according to claim 1, characterized in that, The height of the siphon (1) is one-quarter to one-third of the vertical height of the bottom cone (2) of the washing tower.

3. The siphon device for preventing blockage at the bottom of the washing tower of a gasification unit according to claim 2, characterized in that, Above the opening of the siphon tube (1), a horizontally arranged baffle (120) is welded and fixed by several stainless steel support rods (130). The bottom diameter of the baffle (120) is larger than the opening diameter of the siphon tube (1).

4. The siphon device for preventing blockage at the bottom of the washing tower of the gasification unit according to claim 3, characterized in that, The upper four-fifths of the siphon tube (1) has through holes (150) evenly arranged on its tube wall.

5. The siphon device for preventing blockage at the bottom of the washing tower cone of the gasification unit according to claim 4, characterized in that, A coaxial guide tube (140) with an opening facing downwards is fitted above the opening of the siphon tube (1).

6. The siphon device for preventing blockage at the bottom of the washing tower of a gasification unit according to claim 5, characterized in that, The inner wall of the upper bottom surface of the coaxial guide tube (140) is welded and fixed above the opening of the siphon tube (1) by several stainless steel support rods (130). An annular gap (160) is formed between the inner wall of the coaxial guide tube (140) and the outer wall of the siphon tube (1). The length of the coaxial guide tube (140) is two-thirds of the length of the siphon tube (1).

7. The siphon device for preventing blockage at the bottom of the washing tower of a gasification unit according to claim 1, characterized in that, The main black discharge pipeline (3) is also connected to the main black discharge pipeline (4).

8. The siphon device for preventing blockage at the bottom of the washing tower of a gasification unit according to claim 7, characterized in that, The horizontal section of the main black drain pipe (4) is connected to the main black drain pipe (3), and the vertical section is connected to the connecting pipe (6) and the vertical drain pipe (420) respectively through the three-way valve (410). One end of the connecting pipe (6) is connected to the negative pressure tank (5). The outlet end of the vertical drain pipe (420) is located above the second sewage receiving pool (8). The installation height of the three-way valve (410) is lower than the height of the one-way exhaust valve (520).

9. The siphon device for preventing blockage at the bottom of the washing tower of a gasification unit according to claim 7, characterized in that, The horizontal section of the main black pipeline (4) includes at least two U-shaped bends.

10. The siphon device for preventing blockage at the bottom of the washing tower of a gasification unit according to claim 8, characterized in that, The pressure sensor is electrically connected to the controller, and the controller electrically controls the opening and closing of the first valve (310), the second valve (510), the three-way valve (410), and the one-way exhaust valve (520) according to the feedback signal of the pressure sensor.

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