Water mist absorption device for drain tank in urea hydrolysis denitration process

Abstract

The utility model provides a water mist absorption device for a drain tank in a urea hydrolysis denitration process, which is arranged at the top of the drain tank and comprises a device body, the device body is provided with a water storage chamber and is further provided with a water mist recovery pipe used for recovering water vapor of the drain tank, and a main body of the water mist recovery pipe submerges the water surface of the water storage chamber. The top end of the water mist recycling pipe is communicated with the top of the drain tank through a pipeline, the device body is connected with a cooling device through a pipeline, and the cooling device is used for enabling the water temperature of the water storage cavity to be lower than the boiling point temperature, so that water vapor is cooled and absorbed after passing through the device, and the white smoke emitting phenomenon is greatly relieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to urea hydrolysis denitration production field, especially relates to a kind of water mist absorption device of hydrophobic tank in urea hydrolysis denitration process. BACKGROUND

[0002] In urea hydrolysis denitration process, hydrophobic tank is mainly used for recycling hydrolyzer hydrophobic and product gas heat tracing hydrophobic, and the recovered hydrophobic is transported to urea hydrolysis denitration process in urea dissolving system by hydrophobic pump, to prepare urea solution, and the excess hydrophobic is recycled to plant system.

[0003] In the existing device system, the hydrophobic tank directly discharges the water vapor in the tank to the atmosphere through a connecting emptying pipeline, which not only wastes resources but also seriously affects the corporate image due to the white smoke phenomenon during discharge.

[0004] There is an urgent need for a water mist absorption device for a hydrophobic tank to solve the above problems. INVENTION CONTENTS

[0005] To solve the defects in the prior art, the utility model provides a water mist absorption device for a hydrophobic tank in urea hydrolysis denitration process, which recovers most of the water vapor and effectively reduces the white smoke phenomenon during discharge. The scheme is as follows:

[0006] The water mist absorption device for the hydrophobic tank in urea hydrolysis denitration process is arranged at the top of the hydrophobic tank and includes a device body, a water storage chamber, and a water mist recovery pipe for recovering the water vapor from the hydrophobic tank. The main body of the water mist recovery pipe is submerged in the water in the water storage chamber, the top end of the water mist recovery pipe is connected to the top of the hydrophobic tank through a pipeline, and the device body is connected to a cooling device through a pipeline. The cooling device is used to lower the water temperature in the water storage chamber below the boiling point.

[0007] Further, the water mist recovery pipe is arranged in a water seal structure, which includes a water seal and a connected pipeline network.

[0008] Further, the water mist recovery pipe includes a first connecting pipe as the water seal, a second connecting pipe, a third connecting pipe, and a fourth connecting pipe, which are connected through a four-way pipe joint. The second, third, and fourth connecting pipes are straight pipes, and air holes are formed in the pipe walls. The first connecting pipe is L-shaped, and air holes are formed in the bottom pipeline and the top end of the top pipeline, which is connected to the hydrophobic tank.

[0009] Further, the cooling device includes desalted water, a valve, and a flow regulating device. The desalted water is connected to the device body through a pipeline, and the flow regulating device and the valve are arranged between the desalted water and the device body.

[0010] Further, the flow regulating device comprises an electric actuator and a regulating valve, and the electric actuator controls the flow of the regulating valve.

[0011] Further, the opening of the regulating valve is adjusted to keep the water temperature in the water storage chamber within the range of 80-90 DEG C.

[0012] Further, the device body is provided with a port a, a port b and a port c on the top, and a port d on the side wall; the top end of the water mist recovery pipe is connected to the top of the drain tank through the port a; the port b is connected to the outside for discharging the remaining air after recovery; the port c is connected to the cooling device; the port d is connected to the drain tank through a pipeline, and a valve is arranged on the pipeline, and the port d is located at the lower part of the water storage chamber.

[0013] Further, the device body is provided with an overflow port, and the overflow port is connected to the drain tank through a pipeline.

[0014] Further, the overflow port is an e port arranged on the side wall of the device body.

[0015] Compared with the prior art, the device has the following advantages:

[0016] The device body is provided with a water storage chamber and a water mist recovery pipe, the water mist recovery pipe is located above the water surface of the water storage chamber, the top end of the water mist recovery pipe is connected to the top of the drain tank through a pipeline, and the device body is connected to the cooling device through a pipeline, so that the water vapor is cooled and absorbed after passing through the device, and the white smoke phenomenon is greatly reduced.

[0017] The water mist recovery pipe is arranged in a water seal structure, and the water mist recovery pipe comprises a water seal and a pipeline network connected thereto, water vapor is uniformly distributed into the device, water vapor can be effectively absorbed, and water resources can be saved.

[0018] The cooling device adopts a mode of desalted water combined with a water replenishing regulating valve, the opening of the regulating valve is adjusted according to the temperature at the bottom of the water mist absorption device, the water temperature in the water mist absorption device is kept within the range of 80-90 DEG C, and efficient absorption of water vapor is always maintained.

[0019] The overflow port can ensure that the water seal is always kept at a certain height, and the water vapor discharge resistance is prevented from being too large, so that the pressure in the drain tank is prevented from being too high. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a principle diagram of the water mist absorption device of the embodiment of the device;

[0021] Figure 2is a main view structural schematic diagram of the water mist absorption device of the embodiment of the utility model;

[0022] Figure 3 is a top view structural schematic diagram of the water mist absorption device of the embodiment of the utility model;

[0023] Figure 4 is a top view structural schematic diagram of the water mist recovery pipe of the embodiment of the utility model;

[0024] Figure 5 is Figure 4 the view of A-A shown in the figure;

[0025] Figure 6 is the arrangement drawing of the water mist absorption device of the embodiment of the utility model installed on the water drain tank.

[0026] In above each figure: 1, device body;11, a port;12, b port;13, c port;14, d port;15, e port;2, water storage chamber;3, water mist recovery pipe;31, first connecting pipe;32, second connecting pipe;33, third connecting pipe;34, fourth connecting pipe;35, air hole;36, four-way pipe joint;4, cooling device;41, desalted water;42, valve;43, electric actuator;44, regulating valve;5, auxiliary connecting pipeline;100, water drain tank. DETAILED DESCRIPTION

[0027] In order to facilitate the person skilled in the art to understand the utility model, the specific embodiment of the utility model is explained below in conjunction with the drawings.

[0028] As Figures 1-6 Shown, the water mist absorption device of the water drain tank of urea hydrolysis denitration process, specifically water seal type cooling water mist absorption device, is set up in the top of water drain tank 100, water drain tank discharge port, in this embodiment, water mist absorption device is fixedly installed on the top plate reinforcing rib upper portion of water drain tank 100 by support beam. This can directly install water mist absorption device on the basis of not changing the structure of water drain tank 100, so that the improvement cost is small, and better beneficial effect is obtained under the premise of reducing excessive emergency investment.

[0029] Water mist absorption device includes device body 1, and water storage chamber 2 is formed in device body 1, and still includes water mist recovery pipe 3 for recovering the water vapor of water drain tank 100, and the main part of water mist recovery pipe 3 is over the water level of water storage chamber 2, and the top end of water mist recovery pipe 3 is communicated with the top of water drain tank 100 by pipeline, and device body 1 is connected with cooling device 4 by pipeline, and cooling device 4 is used to make the water temperature of water storage chamber 2 lower than boiling point temperature.

[0030] Specifically, as Figure 2 , 4As shown in Figure 5, the water mist recovery pipe 3 is configured as a water seal structure, including a water seal and a connected pipeline network.

[0031] More specifically, such as Figure 4 As shown, the water mist recovery pipe 3 includes a first connecting pipe 31 serving as a water seal, and also includes a second connecting pipe 32, a third connecting pipe 33, and a fourth connecting pipe 34. The four connecting pipes are sealed together via a four-way pipe joint 36. The second, third, and fourth connecting pipes are all straight pipes, each with a vent hole 35 on its wall. The first connecting pipe 31 is L-shaped, with a vent hole 35 on its bottom section and its top section connected to the condensate tank 100. The vent hole 35 allows for better contact between water vapor and water, improving the recovery rate.

[0032] Specifically, such as Figure 1 As shown, the cooling device 4 includes demineralized water 41, a valve 42, and a flow regulating device. The demineralized water 41 is connected to the device body 1 via a pipeline. The flow regulating device and the valve 42 are located between the demineralized water 41 and the device body 1. The flow regulating device includes an electric actuator 43 and a regulating valve 44. The electric actuator 43 controls the flow rate of the regulating valve 44. In this embodiment, the water temperature in the water storage chamber 2 is maintained within the range of 80-90°C by adjusting the opening of the regulating valve 44. In this embodiment, the demineralized water 41 is selected as room temperature demineralized water 41. An auxiliary connecting pipeline 5 is also connected between the demineralized water 41 and the device body 1. A valve 42 is installed on the auxiliary pipeline, and the auxiliary connecting pipeline 5 is connected in parallel with the pipeline equipped with the valve 42 and the flow regulating device. Before the water mist recovery device operates, the auxiliary connecting pipeline 5 is open to provide water to the water storage chamber 2; when the water mist recovery device operates, the auxiliary connecting pipeline 5 is closed, and the cooling device 4 operates.

[0033] Specifically, the device body 1 has ports a11, b12, and c13 on its top, and ports d14 and e15 on its side wall. Port a11 is the top end of the first connecting pipe 31, and the top end of the water mist recovery pipe 3 is connected to the top of the condensate tank 100 through port a11. Port b12 is connected to the outside and is used to discharge the remaining water vapor after recovery. It also has an auxiliary function of preventing pressure increase inside the water mist absorption device when the water mist recovery pipe 3 fails, thus providing pressure relief protection. Port c13 is connected to the cooling device 4 or the auxiliary connecting pipe 5. Port d14 is connected to the condensate tank 100 through a pipe with a valve 42 installed on it. Port d14 is located at the bottom of the water storage chamber 2 and is used to drain the water in the water storage chamber 2 into the condensate tank 100 after the water mist recovery device has finished working. Port e15 is an overflow outlet, which is connected to the condensate tank 100 through a pipe to keep the liquid level in the water storage chamber 2 stable.

[0034] Work process:

[0035] The water vapor in the hydrophobic tank 100 enters the water mist recovery pipe 3 through the pipeline. Since the water temperature in the water storage chamber 2 is lower than the boiling point of water, the water vapor is cooled and converted into water. The water mist recovery device recovers the water vapor into water. After the water mist recovery pipe 3 operates for a period of time, the water in the water storage chamber 2 is continuously heated due to the addition of high-temperature water vapor. The cooling device 4 inputs the normal-temperature desalted water 41 into the water storage chamber 2 through the pipeline to cool the water. The addition amount of the desalted water 41 is adjusted by adjusting the opening degree of the regulating valve 44, so that the water temperature in the water storage chamber 2 is maintained within the range of 80-90 DEG C. When the water gradually increases, the water level in the water storage chamber 2 continuously rises to the overflow port, i.e., the e port 15. The excess water flows into the hydrophobic tank 100 through the overflow port.

[0036] The above-mentioned embodiments of the present application do not constitute a limitation on the protection scope of the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A water mist absorption device for a hydrophobic tank in a urea hydrolytic denitration process, characterized by, The device is arranged on the top of the hydrophobic tank (100), comprising a device body (1) provided with a water storage chamber (2), and a water mist recovery pipe (3) for recovering water vapor of the hydrophobic tank (100), the main body of the water mist recovery pipe (3) is submerged in the water surface of the water storage chamber (2), the top end of the water mist recovery pipe (3) is communicated with the top of the hydrophobic tank (100) through a pipeline, the device body (1) is connected with a cooling device (4) through a pipeline, and the cooling device (4) is used for lowering the water temperature of the water storage chamber (2) below the boiling point temperature.

2. The water mist absorption device according to claim 1, characterized in that The water mist recovery pipe (3) is arranged in a water seal structure, comprising a water seal and a connected pipeline network.

3. The water mist absorption device according to claim 2, characterized in that The water mist recovery pipe (3) comprises a first connecting pipe (31) as the water seal, a second connecting pipe (32), a third connecting pipe (33) and a fourth connecting pipe (34), and the four connecting pipes are connected through a four-way pipe joint (36); the second, third and fourth connecting pipes are straight-through pipes, and air holes (35) are arranged on the pipe walls; the first connecting pipe (31) is in an L shape, the air holes (35) are arranged on the bottom pipeline, and the top end of the top pipeline is communicated with the hydrophobic tank (100).

4. The water mist absorption apparatus according to claim 1, wherein The cooling device (4) comprises desalted water (41), a valve (42) and a flow adjusting device, the desalted water (41) is connected with the device body (1) through a pipeline, and the flow adjusting device and the valve (42) are arranged between the desalted water (41) and the device body (1).

5. The water mist absorption device according to claim 4, characterized in that The flow adjusting device comprises an electric actuator (43) and an adjusting valve (44), and the electric actuator (43) controls the flow of the adjusting valve (44).

6. The water mist absorption device according to claim 5, characterized in that The opening degree of the adjusting valve (44) is adjusted, so that the water temperature of the water storage chamber (2) is maintained in the range of 80-90 DEG C.

7. The water mist absorption apparatus according to claim 1, wherein The top of the device body (1) is provided with a port a (11), a port b (12) and a port c (13), and a port d (14) is arranged on the side wall; the top end of the water mist recovery pipe (3) is connected with the top of the hydrophobic tank (100) through the port a (11); the port b (12) is connected with the outside, and is used for discharging the remaining water vapor after recovery; the port c (13) is connected with the cooling device (4); the port d (14) is connected with the hydrophobic tank (100) through a pipeline, a valve (42) is arranged on the pipeline, and the port d (14) is located at the lower part of the water storage chamber (2).

8. The water mist absorption apparatus according to claim 1, wherein The device body (1) is provided with a water overflow port, and the water overflow port is connected with the hydrophobic tank (100) through a pipeline.

9. The water mist absorption device of claim 8, wherein, The water overflow port is an e port (15) arranged on the side wall of the device body (1).

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