Anti-jump-stop device and method for draught fan of ortho-nitrate tail gas treatment unit

Abstract

The invention belongs to the fields of chemistry, chemical industry production and environmental protection, and relates to an anti-jump stop device and method for a draught fan of an o-nitrate tail gas treatment unit. Comprising a water film separator, a circulating saline water tank and an emptying pipe, a gas outlet in the upper portion of the water film separator is connected with the emptying pipe through a fan, and a water circulating pump is arranged between the water film separator and the circulating saline water tank. Two hoses inserted below the liquid level in the tonnage barrel are arranged in the tonnage barrel; and the other ends of the two hoses are respectively connected with a bottom spray guide valve of a fan outlet pipeline and a bottom spray guide opening of a water circulating pump inlet filter. By means of the principle of communicating vessels, the accumulated water height in the exhaust pipe and the fan outlet pipeline is reduced, it is guaranteed that the fan cannot jump and stop due to too large back pressure, long-period stable operation of the device is guaranteed, meanwhile, the labor cost is saved, and the production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the fields of chemistry, chemical production and environmental protection, and is used to deal with and solve the problems of excessive water and liquid accumulation in the exhaust pipe of an environmental protection device causing abnormalities or tripping of a fan, and relates to a device and method for preventing the fan of an ortho-nitrogen tail gas treatment unit from tripping. Background Art

[0002] In order to better protect the environment, the production facilities of ortho-nitrate are generally equipped with supporting ortho-nitrate tail gas treatment devices. The working principle of the device is: the tail gas is sucked into the two-stage water membrane device in turn by a fan, so that the ortho-nitrate component in the tail gas is in reverse contact with the water spray, and the ortho-nitrate component in the tail gas is cooled by water spray to undergo a phase change (gas condenses into solid) and enters the water, thereby achieving the effect of purifying the tail gas.

[0003] When the exhaust gas treatment device is far away from the tank area and the platform loading and unloading area, a high-suction fan must be used to ensure the suction force. However, while ensuring the suction force, a part of the spray water of the two-stage water film separator is carried to the fan by the exhaust gas in the form of water foam. Part of the water foam is eventually discharged through the drain pipe, and the other part becomes accumulated water and liquid deposited in the drain pipe and the fan outlet pipeline. With the increase of usage time, the water level in the drain pipe and the fan outlet pipeline also increases, resulting in higher and higher exhaust back pressure of the fan, which eventually causes the fan to trip and cause unplanned shutdown.

[0004] At present, for the above situation, it is necessary to manually open the drain pipe of the ortho-nitrogen tail gas treatment device or the drain valve at the bottom of the fan outlet pipe regularly to directly discharge the accumulated water and liquid in the pipe and collect them for treatment as wastewater.

[0005] Since the drain pipe or the shower valve at the bottom of the fan outlet pipe is opened intermittently at regular intervals, it is impossible to guarantee that the accumulated water and liquid will be discharged in time. Therefore, the fan tripping due to excessive outlet back pressure caused by excessive accumulated water and liquid height cannot be completely avoided. The accumulated water and liquid need to be manually drained and collected for transportation, which consumes a lot of human resources and transportation costs. At the same time, water spraying also requires additional new water, which increases the processing cost. Summary of the invention

[0006] The object of the present invention is to solve the above-mentioned problems and to provide a device and method for preventing the fan of an ortho-nitrogen tail gas treatment device from tripping and stopping.

[0007] In order to achieve the above-mentioned purpose, the main technical scheme of the present invention is: a device for preventing the fan from tripping and stopping of an ortho-nitrogen tail gas treatment unit, comprising a water film separator, a circulating brine tank and a drain pipe, wherein the upper gas outlet of the water film separator is connected to the drain pipe through a fan, and a water circulation pump is arranged between the water film separator and the circulating brine tank, and the feature is that a ton barrel is arranged below the fan and the drain pipe, and the bottom of the ton barrel is connected to the drain valve at the bottom of the drain pipe, and two hoses inserted below the liquid level in the barrel are arranged in the ton barrel, and the other ends of the two hoses are respectively connected to the drain valve at the bottom of the fan outlet pipeline and the drain port at the bottom of the water circulation pump inlet filter.

[0008] Furthermore, the ton barrel is provided with a top cover, and two hoses are inserted into the ton barrel through an opening of the top cover.

[0009] Furthermore, the ton barrel is connected to the drain valve at the bottom of the drain pipe through a bottom valve and a wire-reinforced hose.

[0010] Further preferably, the two hoses are a metal hose and a rubber hose respectively, the other end of the metal hose is connected to the bottom drain port of the water circulation pump inlet filter through a valve, and the other end of the rubber hose is connected to the bottom drain valve of the fan outlet pipeline.

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

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

[0013] Further preferably, the diameters of the two hoses are both DN25mm.

[0014] Furthermore, the water membrane separator is provided with an inlet for ortho-nitrogen tail gas and an inlet and outlet for circulating water in the middle, and a slag discharge port is provided at the bottom; and the circulating brine tank is provided with a slag discharge port at the bottom.

[0015] The present invention also includes valves and other parts commonly used in this field.

[0016] The present invention also provides a method for preventing the fan of an ortho-nitrogen tail gas treatment unit from tripping and stopping, and the above-mentioned anti-tripping device is adopted: opening the drain valve at the bottom of the drain pipe and the valve at the bottom of the ton barrel, and the accumulated water and liquid in the drain pipe will be continuously self-pressurized into the ton barrel; opening the drain valve at the bottom of the fan outlet pipeline, and the accumulated water and liquid in the fan outlet pipeline will be continuously self-pressurized into the ton barrel; when the liquid level of the ton barrel is close to 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 until the liquid level of the ton barrel drops to the lower limit.

[0017] Furthermore, when the liquid level in the ton barrel approaches the upper limit, first close the outlet valve of the water circulation pump, then close the valve at the front end of the water circulation pump filter, open the filter drain valve, 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 1.6~2.0m 3 / h until the liquid level in the barrel drops to the lower limit.

[0018] The present invention discloses a device and method for preventing a fan of an ortho-nitrogen tail gas treatment device from tripping and stopping. The device and method utilize the principle of a communicating vessel to reduce the height of water accumulation in an exhaust duct and a fan outlet pipeline, thereby ensuring that the fan will not trip and stop due to excessive back pressure, thereby ensuring long-term stable operation of the device, and at the same time saving labor costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the connection structure of the device according to the embodiment of the present invention.

[0020] In the figure, 1-ton barrel, 2-wire reinforced hose, 3-rubber hose, 4-metal hose, 5-fan, 6-water circulation pump, 7-drain pipe.

[0021] The accompanying drawings are used to provide further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementation methods, they are used to explain the present invention / invention embodiments, but do not constitute a limitation to the embodiments of the present invention. Implementation

[0022] The specific implementation of the present invention is described in detail below in conjunction with the embodiments and drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiments of the present invention, and is not used to limit the embodiments of the present invention.

[0023] In the embodiments of the present invention, unless otherwise stated, the directional words used, such as "upper, lower, left, right", generally refer to the directional or positional relationship shown in the drawings, or the directional or positional relationship in which the product of the invention is usually placed when in use. The terms "first", "second", "third", etc. are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

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

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

[0026] In addition, the terms "roughly" and "basically" are intended to explain that the relevant content does not require absolute precision, but can have certain deviations. For example, "roughly equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation, there are generally certain deviations. Therefore, in addition to absolute equality, "roughly equal" also includes the above-mentioned situation with certain deviations. Taking this as an example, in other cases, unless otherwise specified, the terms "roughly" and "basically" have similar meanings to the above.

[0027] 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example 1

[0028] A reference to the fan anti-tripping device for the ortho-nitrogen tail gas treatment unit Figure 1 , mainly including a water film separator, a circulating brine tank and an emptying pipe 7. The gas outlet at the upper part of the water film separator is connected to the emptying pipe 7 through a fan 5. A water circulation pump 6 is arranged between the water film separator and the circulating brine tank. The innovation of the embodiment is that a ton barrel 1 is arranged below the fan 5 and the emptying pipe 7. The bottom of the ton barrel 1 is connected to the drain valve at the bottom of the drain pipe 7. Two hoses are arranged in the ton barrel 1 and inserted below the liquid level in the barrel. The other ends of the two hoses are respectively connected to the drain valve at the bottom of the fan 5 outlet pipeline and the drain port at the bottom of the water circulation pump 6 inlet filter.

[0029] In the embodiment, the volume of the ton barrel 1 is 1m 3 Ton barrel, the bottom valve of ton barrel 1 is connected to DN50mm steel wire reinforced hose 2, the other end of DN50mm steel wire reinforced hose 2 is connected to the bottom drain valve of drain pipe 7, the top cover of ton barrel 1 is respectively inserted into one end of DN25mm metal hose 4 and DN25mm rubber hose 3, the ports of two hoses are both submerged below the liquid level in the barrel, the other end of DN25mm rubber hose 3 is connected to the bottom drain valve of fan 5 outlet pipeline, the other end of DN25mm metal hose 4 is connected to the bottom drain port of water circulation pump 6 inlet filter, and a DN25mm valve is installed at the connection.

[0030] In the embodiment, the water membrane separator is provided with an inlet for ortho-nitrogen tail gas and an inlet and outlet for circulating water in the middle, and a slag discharge port is provided at the bottom; and a slag discharge port is provided at the bottom of the circulating brine tank.

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

[0032] A method for preventing a fan from tripping and stopping of an ortho-nitrogen tail gas treatment unit adopts the anti-tripping device of Example 1, and the anti-tripping method is as follows: open the drain valve at the bottom of the drain pipe and the valve at the bottom of the ton barrel, and according to the principle of the communicating vessel, the accumulated water and liquid in the drain pipe will be continuously self-pressurized into the ton barrel; open the drain valve at the bottom of the fan outlet pipeline, and according to the principle of the communicating vessel, the accumulated water and liquid in the fan outlet pipeline will be continuously self-pressurized into the ton barrel; when the liquid level of the ton barrel is close to 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 to 0.2-0.3MPa; the pumping flow rate is controlled to 1.6-2.0m 3 / h until the liquid level in the barrel drops to the lower limit.

[0033] In the embodiment, the ton barrel is connected to the drain pipe and the fan outlet pipeline respectively. According to the communicating vessel principle, a large amount of liquid in the drain pipe and the fan outlet pipeline will continuously enter the ton barrel by self-pressure until the liquid level in the drain pipe and the fan outlet pipeline is equal to the liquid level in the ton barrel. Taking the drain pipe in the embodiment as an example: since the bottom area of ​​the drain pipe is 0.09m 2 ; The bottom area of ​​the ton barrel is 1m 2 , so the water level in the drain pipe will drop to 8% of the original level. Effectively ensure that the water level in the drain pipe and the fan outlet pipeline is at a low level (no more than 1 meter), so the maximum back pressure at the fan outlet is 10kPa, which is much lower than the fan outlet pressure of 53.9kPa, thus fundamentally ensuring that the fan will not trip due to excessive back pressure.

[0034] In the embodiment, by setting up interconnecting pipelines between the emptying pipe, the fan outlet pipeline and the ton barrel, the communicating vessel principle is used to realize the automatic flow of accumulated water and liquid from the emptying pipe and the fan outlet pipeline into the ton barrel, thereby eliminating the need for manual cleaning and transportation, saving human resources and transportation costs.

[0035] In the embodiment, when 1m 3 When the liquid level in the ton barrel approaches the upper limit, the accumulated water in the ton barrel is sent to the feed filter of the spray water circulation pump through the accumulated water return pipeline, and then sent to the water tank after being pressurized by the pump, so that the accumulated water can be recycled, reducing the recovery and processing load of the production equipment while also avoiding water waste.

Claims

1. A fan anti-tripping device for an ortho-nitrate tail gas treatment unit, comprising a water film separator, a circulating brine tank and an exhaust pipe, wherein the gas outlet at the top of the water film separator is connected to the exhaust pipe through a fan, and a water circulation pump is provided between the water film separator and the circulating brine tank, characterized in that A ton barrel is provided below the fan and the drain pipe, and the bottom of the ton barrel is connected to the drain valve at the bottom of the drain pipe. Two hoses are inserted below the liquid level in the barrel. The other ends of the two hoses are respectively connected to the drain valve at the bottom of the fan outlet pipeline and the drain port at the bottom of the water circulation pump inlet filter.

2. The fan anti-tripping device for the ortho-nitrogen tail gas treatment unit according to claim 1 is characterized in that: The ton barrel is provided with a top cover, and two hoses are inserted into the ton barrel through the opening of the top cover.

3. The fan anti-tripping device for the ortho-nitrogen tail gas treatment unit according to claim 1 is characterized in that: The ton barrel is connected to the drain valve at the bottom of the drain pipe through a bottom valve and a steel wire reinforced hose.

4. The fan anti-tripping device for the ortho-nitrogen tail gas treatment unit according to claim 1 is characterized in that: The two hoses are respectively a metal hose and a rubber hose. The other end of the metal hose is connected to the bottom drain port of the water circulation pump inlet filter through a valve, and the other end of the rubber hose is connected to the bottom drain valve of the fan outlet pipeline.

5. The fan anti-tripping device for the ortho-nitrogen tail gas treatment unit according to claim 1 or 2, characterized in that: The volume of the ton barrel is 1m 3 .

6. The fan anti-tripping device for the ortho-nitrogen tail gas treatment unit according to claim 3 is characterized in that: The diameter of the steel wire reinforced hose is DN50mm.

7. The fan anti-tripping device for the ortho-nitrogen tail gas treatment unit according to claim 2 or 4, characterized in that: The diameters of the two hoses are both DN25mm.

8. The fan anti-tripping device for the ortho-nitrogen tail gas treatment unit according to claim 1 is characterized in that: The water membrane separator is provided with an inlet for ortho-nitrogen tail gas and an inlet and outlet for circulating water in the middle, and a slag discharge port is provided at the bottom; and the circulating brine tank is provided with a slag discharge port at the bottom.

9. A method for preventing fan from tripping and stopping in a nitrate tail gas treatment unit, characterized in that Adopt the anti-tripping device as described in claims 1-9: open the drain valve at the bottom of the drain pipe and the valve at the bottom of the ton barrel, and the accumulated water and liquid in the drain pipe will be continuously self-pressurized into the ton barrel; open the drain valve at the bottom of the fan outlet pipeline, and the accumulated water and liquid in the fan outlet pipeline will be continuously self-pressurized into the ton barrel; when the liquid level in the ton barrel is close to 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 until the liquid level in the ton barrel drops to the lower limit.

10. The method according to claim 9, characterized in that When the liquid level in the barrel approaches the upper limit, first close the outlet valve of the water circulation pump, then close the valve in front of the water circulation pump filter, open the filter drain valve, 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 1.6~2.0m 3 / h until the liquid level in the barrel drops to the lower limit.

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