Deep purification system for emptied tail gas

Abstract

The utility model relates to the field of tail gas purification, in particular to an emptying tail gas deep purification system which comprises a low-pressure absorption tower, the low-pressure absorption tower is connected with an emptying tail gas purifier through a tail gas emptying pipe, the emptying tail gas purifier comprises a cylinder body, and a butt joint emptying pipe is arranged at the bottom of the cylinder body. The butt joint blow-down pipe is connected with the tail gas blow-down pipe, and a waste liquid recovery pipe is further arranged on one side of the butt joint blow-down pipe; a tail gas separated gas outlet is formed in the top of the barrel. Compared with the prior art, the utility model solves the problem that condensate, oil and impurities in the tail gas in the emptying tail gas of the low-pressure absorption tower float to the production field at will, and moves H2 in the gas mixture out of the explosion range, thereby eliminating the hidden dangers of fire and explosion.

Description

TECHNICAL FIELD

[0001] The utility model relates to tail gas purification field, specifically provide a kind of venting tail gas deep purification system. BACKGROUND

[0002] Low-pressure absorption tower in urea production device is used to absorb small amount of NH3 and CO2 gas in high washer venting air, after gas-liquid separation, liquid returns ammonia tank, gas is discharged from low-pressure absorption tower top gas phase regulating valve outlet pipe, because small amount of H2 gas is contained in the discharged gas, and fire is easily occurred during regulating valve discharge process due to friction or static electricity, even explosion.

[0003] However, the problem that follows is that low-pressure absorption tower venting tail gas contains a large amount of steam, condensate and oil and other sundries, with low-pressure absorption tower venting tail gas being directly discharged, condensed venting waste liquid falls to ground, so that urea production site ground and equipment are drenched, stained with oil, causing great environmental pollution. SUMMARY

[0004] The utility model provides a kind of venting tail gas deep purification system for the above prior art deficiencies, with reasonable design, simple structure, safe use, reduce maintenance, energy saving and consumption reduction.

[0005] The utility model discloses the technical scheme that adopts to solve its technical problem is:

[0006] A kind of venting tail gas deep purification system, including low-pressure absorption tower, the low-pressure absorption tower is connected with venting tail gas purifier by tail gas venting pipe, the venting tail gas purifier includes cylinder, the cylinder bottom is equipped with butt joint venting pipe, the butt joint venting pipe is connected with the tail gas venting pipe, the side of butt joint venting pipe is also equipped with waste liquid recovery pipe;

[0007] The top of the cylinder is provided with tail gas separation gas outlet.

[0008] Further, the tail gas venting pipe is equipped with regulating valve, and the tail gas venting pipe is also butt jointed with steam pipeline, and the venting tail gas outlet after adding steam is connected to venting tail gas purifier.

[0009] Further, the venting tail gas purifier cylinder is equipped with liquid baffle cover, the bottom of the liquid baffle cover is equipped with separation cone, one side of the separation cone is fixed with liquid baffle cover support rib, the other side of the liquid baffle cover support rib is fixed with the butt joint venting pipe.

[0010] Further, the liquid baffle cover is umbrella-shaped, the separation cone is fixed below the liquid baffle cover, and the center of the separation cone is downward cone.

[0011] Further, the liquid baffle cover support rib is at least two.

[0012] Furthermore, the outer diameter of the docking vent pipe is 130-180 mm.

[0013] Furthermore, the exhaust gas separation outlet at the top of the exhaust gas purifier cylinder faces one side, and a baffle is provided on the other side.

[0014] Compared with existing technologies, the exhaust gas deep purification system of this utility model has the following outstanding advantages:

[0015] This invention connects a steam pipe to the exhaust gas vent pipe and introduces 0.8MPa steam to move the H2 in the exhaust gas mixture out of the explosion range, thereby eliminating the risk of fire and explosion.

[0016] The exhaust gas vent pipe is connected to an exhaust gas purifier, which is equipped with a liquid baffle, a separation cone, and an exhaust gas separation outlet on one side of the cylinder. This solves the problem of condensate, oil, and impurities in the exhaust gas from the low-pressure absorption tower being randomly spilled onto the production site, thus purifying the production environment and ensuring equipment hygiene. The recovered condensate and oil impurities in the exhaust gas are discharged into an underground tank through a waste liquid recovery pipe and sent to water treatment for secondary reuse, achieving the goal of energy conservation and consumption reduction. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Appendix Fig. 1 This is a schematic diagram of a deep purification system for exhaust gas.

[0019] Appendix Fig. 2 This is a schematic diagram of the structure of an exhaust gas purifier in an exhaust gas deep purification system.

[0020] The markings in the attached diagram represent:

[0021] 1. Exhaust gas purifier, 2. Steam pipe, 3. Regulating valve, 4. Exhaust gas vent pipe, 5. Low-pressure absorption tower, 6. Exhaust gas separation outlet, 7. Side flange, 8. Separation cone, 9. Cylinder, 10. Connecting vent pipe, 11. Waste liquid recovery pipe, 12. Liquid baffle support rib, 13. Liquid baffle. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0023] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to the upper, lower, left, and right as shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself.

[0024] The following is a preferred embodiment:

[0025] like Figs. 1-2 As shown, a deep purification system for vented exhaust gas in this embodiment includes a low-pressure absorption tower 5, and the low-pressure absorption tower 5 is connected to a vented exhaust gas purifier 1 through an exhaust gas venting pipe 4.

[0026] The exhaust gas purifier 1 includes a cylinder 9, and a docking vent pipe 10 is provided at the bottom of the cylinder 9. In this embodiment, the docking vent pipe 10 and the exhaust gas vent pipe 4 are connected by a flange. A waste liquid recovery pipe 11 is provided on the left side of the docking vent pipe 10.

[0027] The top of the exhaust gas purifier 1 cylinder 9 is provided with an exhaust gas separation outlet 6.

[0028] The exhaust gas venting pipe 4 is equipped with a regulating valve 3, and the exhaust gas venting pipe 4 is also connected to a steam pipe 2. The exhaust gas outlet after adding steam is connected to the exhaust gas purifier 1.

[0029] The exhaust gas purifier 1 has a liquid baffle 13 inside the cylinder 9. The bottom of the liquid baffle 13 has a separation cone 8. In this embodiment, the left side of the separation cone 8 is fixed with a liquid baffle support rib 12. In this embodiment, there are 3 liquid baffle support ribs 12. The top of the 3 liquid baffle support ribs 12 are welded and evenly distributed on the separation cone 8, and the bottom of the liquid baffle support ribs 12 is welded to the docking vent pipe 10.

[0030] The liquid baffle 13 is umbrella-shaped, and the separation cone 8 is fixed under the liquid baffle 13. The center of the separation cone 8 is a downward-facing cone.

[0031] In this embodiment, the outer diameter of the vent pipe 10 is 150 mm.

[0032] In this embodiment, the exhaust gas separation outlet 6 at the top of the cylinder 9 of the exhaust gas purifier 1 faces to the left, and a baffle 7 is provided on the right side.

[0033] When using the deep purification system for vented exhaust gas, the low-pressure absorption tower 5 absorbs the small amount of NH3 and CO2 gas emitted from the urea production system. The inert gas, oil, and trace amounts of H2 gas are then sent to the vented exhaust gas purifier 1 through the exhaust gas vent pipe 4. A regulating valve 3 is installed on the exhaust gas vent pipe 4. After the pressure is reduced by the regulating valve 3, the gas is sent to the vented exhaust gas purifier 1. A steam pipe 2 is connected between the regulating valve 3 and the vented exhaust gas purifier 1 to remove the H2 gas in the vented exhaust gas from the explosion range.

[0034] The gas-liquid mixture is separated by the liquid baffle 13 and the separation cone 8 in the vent gas purifier 1, the generated gas enters the vent gas separation gas outlet 6 through the space between the liquid baffle 13 and the cylinder 9, and the liquid collected at the bottom of the vent gas purifier 1 is recovered to the underground tank through the waste liquid recovery pipe 11. An outlet is provided at the outlet for discharging into the atmosphere, and the outlet is directed towards the baffle 7, and the specific direction of the outlet is selected according to the needs, so that the vent gas separation gas outlet 6 is directed towards a safe and unmanned direction.

[0035] The liquid baffle 13 and the separation cone 8 are fixedly connected with the venting pipe 10 through the liquid baffle support rib 12, and the liquid baffle 13 and the separation cone 8 are fixed.

[0036] The system has two advantages: first, it is not limited by weather during the venting process, and it can be used normally during the rain process, and the rainwater entering the vent gas purifier 1 is collected into the waste liquid recovery pipe 11 and into the underground tank without reducing the venting amount; second, it almost does not need maintenance, and once it is put into use, it does not need any maintenance, flushing and other processes, and the device itself has self-cleaning and flushing capabilities.

[0037] Product inspection:

[0038] Inspection method: sampling and analyzing from the vent gas separation gas outlet 6, and detecting the liquid content therein.

[0039] Performance data: the liquid content in the gas directly discharged into the atmosphere per hour from the original low-pressure absorption tower vent gas, minus the amount of waste liquid recovered by the vent gas purifier, if it is greater than 80% of the original value, it proves that the design effect of the device is achieved, and the measured value is >93%. It is proved that this system is effective for energy saving and consumption reduction.

[0040] The above-described embodiments are only one of the preferred specific embodiments of the present application, and the usual changes and replacements made by those skilled in the art within the technical scheme of the present application should be included in the protection scope of the present application.

Claims

1. A deep clean-up system for vent gas, comprising a low pressure absorption column, characterized in that, The low-pressure absorption tower is connected with a vent tail gas purifier through a tail gas vent pipe, the vent tail gas purifier comprises a cylinder, the bottom of the cylinder is provided with a butt joint vent pipe, the butt joint vent pipe is connected with the tail gas vent pipe, one side of the butt joint vent pipe is further provided with a waste liquid recovery pipe; The top of the cylinder is provided with a tail gas separation gas outlet.

2. The deep purification system for vent gas according to claim 1, characterized in that, An adjusting valve is arranged on the tail gas vent pipe, and a steam pipeline is further butt jointed on the tail gas vent pipe, and the vent tail gas outlet after adding steam is connected with the vent tail gas purifier.

3. The deep purification system for vent gas according to claim 1 or 2, characterized in that, The inside of the cylinder of the vent tail gas purifier is provided with a liquid blocking cover, the bottom of the liquid blocking cover is provided with a separation cone, one side of the separation cone is fixed with a liquid blocking cover support rib, and the other side of the liquid blocking cover support rib is fixed with the butt joint vent pipe.

4. The deep purification system for vent gas according to claim 3, characterized in that, The liquid blocking cover is umbrella-shaped, the separation cone is fixed below the liquid blocking cover, and the center of the separation cone is downwardly tapered.

5. The deep purification system for vent gas according to claim 3, characterized in that, The liquid blocking cover support rib is at least two.

6. The deep clean-up system for vent gas according to claim 1, characterized in that, The outer diameter of the butt joint vent pipe is 130-180MM.

7. The deep purification system for vent gas according to claim 1, characterized in that, The tail gas separation gas outlet at the top of the cylinder of the vent tail gas purifier is towards one side, and the other side is provided with a blocking edge.

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