A device and method for preventing fan trip of an adjacent nitro tail gas treatment unit

Abstract

The present application belongs to the field of chemistry, chemical production and environmental protection, and relates to a device and method for preventing the fan of a p-nitro tail gas treatment unit from stopping suddenly. The device comprises a water film separator, a circulating brine tank and a venting pipe. The gas outlet of the water film separator is connected to the venting pipe through a fan. A water circulating pump is arranged between the water film separator and the circulating brine tank. A ton barrel is arranged below the fan and the venting pipe. The bottom of the ton barrel is connected to a drain valve at the bottom of the venting pipe. Two hoses are arranged in the ton barrel and inserted into the liquid level. The other ends of the two hoses are respectively connected to a drain valve at the bottom of the fan outlet pipeline and a drain opening at the bottom of an inlet filter of the water circulating pump. The device utilizes the principle of communicating vessels to reduce the water height in the exhaust pipe and the fan outlet pipeline, so as to prevent the fan from stopping suddenly due to excessive back pressure and ensure the long-term stable operation of the device. Meanwhile, the device saves labor cost and improves production efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of chemistry, chemical production and environmental protection, and is used for treating and solving the problem that excessive water and liquid in the exhaust pipe of an environmental protection device cause abnormality or stoppage of a fan, and relates to a device and method for preventing stoppage of a fan of a p-nitrophenol tail gas treatment unit. BACKGROUND

[0002] In order to better protect the environment, a p-nitrophenol tail gas treatment device is generally constructed for a p-nitrophenol production device, and the working principle of the device is as follows: a fan is used to suck the tail gas to two-stage water film devices in sequence, so that the p-nitrophenol component in the tail gas is in reverse contact with the water spray, and the p-nitrophenol component in the tail gas is phase changed (gas sublimation into solid) into water by water spray cooling to achieve the effect of purifying the tail gas.

[0003] When the tail gas treatment device is located far away from the storage tank area and the platform loading and unloading area, a fan with large suction force must be used to ensure the suction force, but at the same time, part of the spray water in the two-stage water film separator is carried to the fan in the form of water mist, and part of the water mist is finally discharged through the exhaust pipe, and the other part becomes water and liquid and deposits in the exhaust pipe and the fan outlet pipeline. With the increase of use time, the water level in the exhaust pipe and the fan outlet pipeline also increases, which causes the exhaust back pressure of the fan to be higher and higher, and finally causes the fan to stop, which causes unplanned shutdown.

[0004] At present, for the above-mentioned situation, the bottom guide valve of the exhaust pipe or the fan outlet pipe of the p-nitrophenol tail gas treatment device is opened manually at regular intervals, and the water and liquid in the pipe are directly discharged and collected and then treated as waste water.

[0005] Since the bottom guide valve of the exhaust pipe or the fan outlet pipe is opened intermittently, it is impossible to ensure that the water and liquid are discharged in time, and therefore the water and liquid height is too high to cause the fan to stop due to excessive exhaust back pressure, which cannot be completely avoided. The water and liquid need to be manually discharged and collected and transported, which consumes a lot of human resources and transportation costs. At the same time, new water needs to be additionally supplied for water spray, which increases the treatment cost. SUMMARY

[0006] The present application is aimed at the above-mentioned problems, and provides a device and method for preventing stoppage of a fan of a p-nitrophenol tail gas treatment unit.

[0007] In order to achieve the above-mentioned purpose, the main technical scheme of the present application is: a fan anti-jump stop device for adjacent nitration tail gas treatment unit, comprising a water film separator, a circulating brine tank and a emptying pipe, the upper gas outlet of the water film separator is connected with the emptying pipe through a fan, a water circulating pump is arranged between the water film separator and the circulating brine tank, characterized in that a ton barrel is arranged below the fan and the emptying pipe, the bottom of the ton barrel is connected with a guide valve at the bottom of the emptying pipe, two soft pipes are arranged in the ton barrel and inserted below the liquid level in the barrel, the other ends of the two soft pipes are respectively connected with a guide valve at the bottom of the fan outlet pipeline and a guide opening at the bottom of the inlet filter of the water circulating pump.

[0008] Further, the ton barrel is provided with a top cover, and the two soft pipes are inserted into the ton barrel through the top cover.

[0009] Further, the ton barrel is connected with the guide valve at the bottom of the emptying pipe through the bottom valve and the steel wire reinforced soft pipe.

[0010] Further preferably, the two soft pipes are respectively a metal soft pipe and a rubber soft pipe, the other end of the metal soft pipe is connected with the guide opening at the bottom of the inlet filter of the water circulating pump through a valve, and the other end of the rubber soft pipe is connected with the guide valve at the bottom of the fan outlet pipeline.

[0011] Further preferably, the volume of the ton barrel is 1m 3 .

[0012] Further preferably, the pipe diameter of the steel wire reinforced soft pipe is DN50mm.

[0013] Further preferably, the pipe diameters of the two soft pipes are both DN25mm.

[0014] Further, the middle part of the water film separator is provided with an adjacent nitration tail gas inlet and a circulating water inlet and outlet, and the lower part is provided with a residue discharge port; the lower part of the circulating brine tank is provided with a residue discharge port.

[0015] The present application also comprises valve and other parts commonly used in the field.

[0016] The present application also provides a method for preventing the fan of the adjacent nitration tail gas treatment unit from jumping and stopping, which adopts the above-mentioned anti-jump stop device: opening the guide valve at the bottom of the emptying pipe and the valve at the bottom of the ton barrel, the accumulated water and liquid in the emptying pipe will continuously self-press to the ton barrel; opening the guide valve at the bottom of the fan outlet pipeline, the accumulated water and liquid in the fan outlet pipeline will continuously self-press to the ton barrel; when the liquid level in the ton barrel approaches the upper limit, first closing the outlet valve of the water circulating pump, then closing the valve at the front end of the filter of the water circulating pump, opening the guide valve of the filter, and then slowly opening the outlet valve of the water circulating pump, until the liquid level in the ton barrel is reduced to the lower limit.

[0017] Further, when the ton barrel liquid level approaches the upper limit, the water circulating pump outlet valve is closed first, then the water circulating pump filter front end valve is closed, the filter guide valve is opened, and the water circulating pump outlet valve is slowly opened to control the water circulating pump outlet pressure at 0.2-0.3 MPa; the pumping flow is controlled at 1.6-2.0 m 3 / h, until the ton barrel liquid level is reduced to the lower limit.

[0018] The device and method for preventing the fan of the adjacent nitro tail gas treatment device from stopping jumping utilize the principle of communicating vessels to reduce the accumulated water height in the exhaust pipe and the fan outlet pipeline, so that the fan will not stop jumping due to excessive back pressure, long-period stable operation of the device is ensured, labor cost is saved, and production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a connection structure schematic diagram of the device of the embodiment of the application.

[0020] In the figure, 1 is a ton barrel, 2 is a steel wire reinforced hose, 3 is a rubber hose, 4 is a metal hose, 5 is a fan, 6 is a water circulating pump, and 7 is a emptying pipe.

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the application, and constitute a part of the specification, and are used to explain the application together with the following specific embodiments, but do not constitute a limitation on the embodiments of the application. EMBODIMENT

[0022] The specific embodiments of the application are described in detail below in combination with the embodiments and the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the embodiments of the application, and are not used to limit the embodiments of the application.

[0023] In the embodiments of the application, the orientation words such as "up, down, left and right" used without the opposite description generally refer to the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the product of the application is used. The terms "first", "second", "third" and the like are only used for distinction and description, and cannot be understood as indicating or implying relative importance.

[0024] The terms "parallel", "vertical" and the like do not mean that the components must be absolutely parallel or vertical, but can be slightly inclined. For example, "parallel" only means that its direction is relatively more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly inclined.

[0025] The terms "horizontal", "vertical", "overhang" and the like do not mean that the components must be absolutely horizontal, vertical or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0026] In addition, the terms "approximately", "substantially" and the like are intended to indicate that the relevant content is not required to be absolutely accurate, but can have some deviation. For example, "approximately equal" does not only mean absolute equality, because in actual production and operation, it is difficult to achieve absolute "equality", and generally there is some deviation. Therefore, in addition to absolute equality, "approximately equal" also includes the above-mentioned case of having some deviation. For example, in other cases, unless otherwise specified, the terms "approximately", "substantially" and the like have similar meanings as described above.

[0027] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Example 1

[0028] A kind of to adjacent nitro exhaust fan device for stopping device reference appendix Figure 1 , mainly including water film separator, circulating brine tank and emptying pipe 7, water film separator upper gas outlet is connected emptying pipe 7 by fan 5, water film separator is equipped with water circulating pump 6 between circulating brine tank, the innovation of the embodiment is that ton barrel 1 is equipped below fan 5 and emptying pipe 7, the bottom of ton barrel 1 is connected with the guide valve at the bottom of emptying pipe 7, two soft tubes are arranged in ton barrel 1 and inserted below liquid level in the barrel, the other end of two soft tubes is connected with the guide valve at the bottom of fan 5 outlet pipeline and the guide opening at the bottom of water circulating pump 6 inlet filter respectively.

[0029] In the embodiment, the volume of ton barrel 1 is 1m 3 The bottom valve of ton barrel 1 is connected with DN50mm steel wire reinforced hose 2, the other end of DN50mm steel wire reinforced hose 2 is connected with the guide valve at the bottom of emptying pipe 7, one end of DN25mm metal hose 4 and DN25mm rubber tube 3 is inserted into the top cover of ton barrel 1, the end port of two soft tubes is immersed below the liquid level in the barrel, the other end of DN25mm rubber hose 3 is connected with the guide valve at the bottom of fan 5 outlet pipeline, the other end of DN25mm metal hose 4 is connected with the guide opening at the bottom of water circulating pump 6 inlet filter, and DN25mm valve is installed at the connection.

[0030] In this embodiment, the water film separator is provided with an inlet for adjacent nitrate tail gas and an inlet and outlet for circulating water in the middle, and a slag discharge port at the bottom; the circulating brine tank is provided with a slag discharge port at the bottom.

[0031] This embodiment also includes valves and other components commonly used in this field. Example 2

[0032] A method for preventing the blower of a nitrile tail gas treatment unit from tripping is provided, employing the anti-tripping device of Example 1. The anti-tripping method is as follows: Open the drain valve at the bottom of the vent pipe and the valve at the bottom of the ton container. According to the principle of communicating vessels, the accumulated water and liquid in the vent pipe will continuously pressurize into the ton container. Open the drain valve at the bottom of the blower outlet pipeline. According to the principle of communicating vessels, the accumulated water and liquid in the blower outlet pipeline will continuously pressurize into the ton container. When the liquid level in the ton container approaches the upper limit, first close the outlet valve of the water circulation pump, then close the front valve of the water circulation pump filter, open the drain valve of the filter, and then slowly open the outlet valve of the water circulation pump to control the outlet pressure of the water circulation pump at 0.2~0.3MPa; the pumping flow rate is controlled at 1.6~2.0m³ / h. 3 / h, until the liquid level in the tonne container is reduced to the lower limit.

[0033] In this embodiment, the ton container is connected to both the drain pipe and the fan outlet pipeline. According to the principle of communicating vessels, a large amount of liquid in the drain pipe and fan outlet pipeline will continuously flow into the ton container under pressure until the liquid levels in the drain pipe and fan outlet pipeline are equal to the liquid levels in the ton container. Taking the drain pipe in this embodiment as an example: since the bottom area of ​​the drain pipe is 0.09m²... 2 The bottom area of ​​the ton container is 1m². 2 Therefore, the water level in the drain pipe will drop to 8% of its original level. This effectively ensures that the water level in the drain pipe and the fan outlet pipeline is at a low level (not exceeding 1 meter). As a result, the maximum back pressure at the fan outlet is 10 kPa, which is much lower than the fan outlet pressure of 53.9 kPa, thus fundamentally ensuring that the fan will not trip due to excessive back pressure.

[0034] In this embodiment, by installing connecting pipelines between the drain pipe, the fan outlet pipeline, and the ton container, the principle of communicating vessels is utilized to allow accumulated water and liquid to flow autonomously from the drain pipe and the fan outlet pipeline into the ton container. This achieves the goal of eliminating the need for manual cleaning and transfer, saving manpower and transfer costs.

[0035] In the embodiment, when 1m 3 When the liquid level in the ton container is close to the upper limit, the accumulated water in the ton container is sent to the feed filter of the spray water circulation pump through the accumulated water return pipeline. After being pressurized by the pump, it is sent to the water tank, so that the accumulated water can be recycled and reused. This reduces the load on the production equipment for recycling and treatment and also avoids water waste.

Claims

1. A device for preventing the fan of a nitro tail gas treatment unit from being stopped abruptly, comprising a water film separator, a circulating brine tank and a venting pipe, the gas outlet at the upper part of the water film separator being connected to the venting pipe through the fan, and a water circulating pump being arranged between the water film separator and the circulating brine tank, characterized in that The ton barrel is provided below the fan and the emptying pipe, and is connected with the guide valve at the bottom of the emptying pipe through a bottom valve and a steel wire reinforced hose. The ton barrel is provided with a top cover, and two hoses are inserted into the ton barrel below the liquid level through the top cover. The other ends of the two hoses are respectively connected with the bottom guide valve of the fan outlet pipeline and the bottom guide opening of the water circulating pump inlet filter. The two hoses are respectively a metal hose and a rubber hose. The other end of the metal hose is connected with the bottom guide opening of the water circulating pump inlet filter through a valve, and the other end of the rubber hose is connected with the bottom guide valve of the fan outlet pipeline.

2. The anti-jump stop device for the fan of the adjacent nitro tail gas treatment unit set according to claim 1, characterized in that, The tonne bucket has a volume of 1 m 3 .

3. The anti-jump stop device for the fan of the adjacent nitro tail gas treatment unit set according to claim 1, characterized in that, The pipe diameter of the steel wire reinforced hose is DN50mm.

4. The anti-jump stop device for the fan of the adjacent nitro tail gas treatment unit set according to claim 1, characterized in that, The pipe diameter of the two hoses is DN25mm.

5. The anti-jump stop device for the fan of the adjacent nitro tail gas treatment unit set according to claim 1, characterized in that, The middle part of the water film separator is provided with an adjacent nitro tail gas inlet and a circulating water inlet and outlet, and the lower part is provided with a slag discharge port. The lower part of the circulating brine tank is provided with a slag discharge port.

6. A method for preventing the fan of a neighboring nitro tail gas treatment unit from being tripped, characterized in that The anti-jump stopping device is opened, the bottom guide valve of the emptying pipe and the bottom valve of the ton barrel are opened, the accumulated water and liquid in the emptying pipe are continuously self-pressured into the ton barrel, the bottom guide valve of the fan outlet pipeline is opened, the accumulated water and liquid in the fan outlet pipeline are continuously self-pressured into the ton barrel, when the liquid level of the ton barrel approaches the upper limit, the outlet valve of the water circulating pump is closed first, then the valve at the front end of the filter of the water circulating pump is closed, the guide valve of the filter is opened, and then the outlet valve of the water circulating pump is slowly opened until the liquid level of the ton barrel is reduced to the lower limit.

7. The method of claim 6, wherein When the ton barrel liquid level is close to the upper limit, first close the water circulating pump outlet valve, then close the water circulating pump filter front end valve, open the filter guide valve, and then slowly open the water circulating pump outlet valve, control the water circulating pump outlet pressure at 0.2-0.3MPa; the pumping flow is controlled at 1.6-2.0m 3 / h, until the ton barrel liquid level is reduced to the lower limit.

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