A rich amine liquid filter cartridge backflush device

Abstract

The utility model discloses a kind of rich amine liquid filter filter core backflush device, comprising: solvent recovery tank, impurity filter tank, rich amine liquid flash tank, rich amine liquid pump, rich amine liquid filtration system, solvent regenerator, regenerator bottom pump, lean amine solution tank and low gas desulfurization tower connected in turn;The low gas desulfurization tower is also connected with the rich amine liquid flash tank;Rich amine liquid filtration system is also connected with solvent recovery tank.By increasing a set of impurity filter tank on the pipeline in solvent recovery tank outlet pressure delivery to rich amine liquid flash tank, impurity filtrate in solvent recovery tank is filtered to newly added impurity filter tank each time, impurity filtrate in impurity filter tank is cleaned periodically, reach the effect of thoroughly removing filter impurity, ensure the quality of lean amine liquid and long-period stable operation of device.

Description

Technical Field

[0001] This utility model relates to the field of low-saturation desulfurization technology for acidic water devices, and more specifically to a backflushing device for a rich amine liquid filter element. Background Technology

[0002] The low-saturation gas desulfurization unit (including solvent regeneration) has a capacity of 10,000 tons / year and an operational flexibility of 30%–110%. The feed gas it processes is sulfur-containing low-saturation gas from upstream units. It employs an amine liquid absorption process, and the resulting rich amine liquid is heated by conventional steam and regenerated through a stripping process. After absorption by the amine liquid, the purified low-saturation gas at the top of the tower is sent to the fuel gas pipeline or hydrogen production unit, while the rich amine liquid at the bottom is sent to the regeneration system. After regeneration, the acidic gas at the top of the tower is sent to the ammonium sulfate production unit, and the lean amine liquid at the bottom is recycled to the low-saturation gas desulfurization section.

[0003] (1) Desulfurization of raw gas

[0004] H2S is an acidic substance. This process uses a composite methyl diethanolamine (MDEA) solvent, which has the characteristics of good selectivity for H2S, high concentration, small solvent circulation volume, and mild corrosion.

[0005] (2) Solvent regeneration

[0006] For diethanolamine (MDEA) solvent, the controlled temperature at the bottom of the regeneration tower is generally between 125 and 130°C. This unit uses N-methyldiethanolamine solvent, and the regenerated product can produce a lean amine solution with H2S ≤ 20 ppm, NH3 ≤ 100 ppm, and oil content ≤ 50 mg / L.

[0007] During actual operation, it was found that the solvent would produce a "foaming" phenomenon. Solvent "foaming" would reduce the processing capacity of the device, increase solvent loss and reduce the purification degree of the gas, and seriously affect the quality of lean amine solution.

[0008] The problems with the filtration system are as follows:

[0009] 1. Frequent filter flushing. The low-temperature gas desulfurization unit is equipped with two amine-rich liquid filtration systems, which frequently become clogged during use. In severe cases, the filters become clogged immediately after being put into operation, requiring switching to the standby filter and flushing, which greatly increases the equipment maintenance costs and the workload of the operators.

[0010] 2. Severe foaming of the amine solution. The unit exhibits significant and stable foaming of the amine solution, with severe liquid carryover in the dry gas and liquid hydrocarbons. Frequent addition of defoamer is typically used to eliminate the foaming phenomenon. The H2S content of the desulfurized product fluctuates, resulting in substandard quality.

[0011] 3. Severe corrosion of desulfurization equipment and pipelines. Internal leakage has occurred in the lean and rich liquid heat exchangers, and the pipelines have become thinner due to corrosion, posing a significant threat to the safe and stable operation of the unit.

[0012] Due to long-term operation, degradation and corrosion products accumulate in the amine desulfurization system. The rich amine solution entering the regeneration tower contains suspended solid particles, hydrocarbons, degradation products, and other impurities, which can corrode the system and cause solvent foaming. Solvent foaming reduces the unit's throughput, increases solvent loss, and decreases gas purification, affecting the stability of the unit's operation. Utility Model Content

[0013] This utility model aims to at least partially solve one of the aforementioned technical problems in the prior art.

[0014] Therefore, one objective of this utility model is to propose a backflushing device for the filter element of a rich amine liquid filter to solve the problem of solvent "foaming", ensure the quality of the lean amine liquid is qualified, and ensure the long-term stable operation of the low gas separation device.

[0015] To achieve the above objectives, this utility model provides a backflushing device for a rich amine liquid filter element, characterized in that it includes: a solvent recovery tank, a rich amine liquid flash tank, a rich amine liquid pump, a rich amine liquid filtration system, a regeneration tower bottom pump, a solvent regeneration tower, a lean amine solution tank, and a low-saturation gas desulfurization tower.

[0016] The solvent recovery tank, the rich amine flash tank, the rich amine pump, the rich amine filtration system, the solvent regeneration tower, the regeneration tower bottom pump, the lean amine solution tank, and the low-separation gas desulfurization tower are connected in sequence.

[0017] The low-saturation gas desulfurization tower is also connected to the amine-rich liquid flash tank.

[0018] The amine-rich liquid filtration system is also connected to a solvent recovery tank.

[0019] Furthermore, the aforementioned device also includes: an impurity storage tank;

[0020] The impurity storage tank is connected to the impurity filter tank.

[0021] As can be seen from the above technical solution, compared with the prior art, this utility model adds an impurity filtration system to the pipeline inside the solvent recovery tank that is pressurized from the outlet of the solvent recovery tank to the flash tank of the rich amine liquid. Each time the solvent recovery tank is pressurized, the impurity filtrate in the solvent recovery tank is transferred to the newly added filtration tank system. The impurity filtrate in the filtration system is cleaned periodically to achieve the effect of thoroughly removing impurities from the filter, thus ensuring the quality of the lean amine liquid and the long-term stable operation of the equipment. Attached Figure Description

[0022] 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 only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 The attached figure is a structural schematic diagram of the present invention.

[0024] The components include: C-101 low-temperature gas desulfurization tower; C-102 solvent regeneration tower; D-102 lean amine liquid storage tank; D-104 rich amine liquid flash tank; D-105 solvent recovery tank; D-106 rich amine liquid filtration system; D-108 impurity filtration tank; D-109 impurity storage tank; P-102 regeneration tower bottom pump; P-104 rich amine liquid pump; and P-101 lean amine liquid pump. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Example 1

[0031] This embodiment provides a backflushing device for a rich amine liquid filter element, including: a solvent recovery tank D-105, an impurity filtration tank D-108, a rich amine liquid flash evaporation tank D-104, a rich amine liquid pump P-104, a rich amine liquid filtration system D-106, a regeneration tower bottom pump P-102, a solvent regeneration tower C-102, a lean amine solution tank D-102, a low-saturation gas desulfurization tower C-101, and an impurity storage tank D-109;

[0032] Solvent recovery tank D-105, impurity filter tank D-108, rich amine flash tank D-104, rich amine pump P-104, rich amine filtration system D-106, solvent regeneration tower C-102, regeneration tower bottom pump P-102, lean amine solution tank D-102, and low-saturation gas desulfurization tower C-101 are connected in sequence.

[0033] The low-gas desulfurization tower C-101 is also connected to the amine-rich liquid flash tank D-104;

[0034] The amine-rich liquid filtration system D-106 is also connected to the solvent recovery tank D-105;

[0035] The impurity filter tank is connected to D-108 and the impurity storage tank D-109.

[0036] Example 2

[0037] This embodiment provides a method for using the backwashing device for the amine-rich liquid filter cartridge described in Embodiment 1, as follows:

[0038] The rich amine solution from the bottom of the low-separation gas desulfurization tower C-101 enters the rich amine solution flash tank D-104. After flash evaporation, the liquid phase is pressurized by the rich amine solution pump P-104 and then enters the rich amine solution filtration system D-106 to remove impurities generated by corrosion and other reasons. After filtration, it enters the solvent regeneration tower C-102. The lean amine solution from the bottom of the tower is pressurized by the regeneration tower bottom pump P-102 and enters the lean amine solution storage tank D-102. The lean amine solution in the tank is pressurized by the lean amine solution pump P-101 and sent back to the low-separation gas desulfurization tower C-101 for recycling.

[0039] The filter residue after the rich amine solution is filtered through the system is discharged into the solvent recovery tank D-105. Once the solvent recovery tank reaches the required level, the filtrate is returned to tank D-104 via nitrogen pressurization. This results in an increasing amount of filter residue being produced by the filtration system, which affects solvent absorption and ultimately leads to substandard quality of the lean amine solution.

[0040] Impurities generated in the amine-rich liquid filtration system D-106 due to corrosion and other reasons are discharged into the solvent recovery tank D-105 after periodic backwashing. The filtrate in D-105 is then returned to tank D-104 via nitrogen pressurization. Specifically, a higher-precision impurity filter tank D-108 is installed on the pipeline from the outlet of solvent recovery tank D-105 to the amine-rich liquid flash tank D-104. Each time solvent recovery tank D-105 is pressurized, the impurity filtrate in D-105 is passed through impurity filter tank D-108. Periodically, the impurity filtrate in the filter tank is disassembled and cleaned before being reused.

[0041] Since the filter element in the D-106 amine-rich liquid filtration system has a filtration accuracy of 50µm, the filter screen in the newly added impurity filtration tank D-108 has a filtration accuracy of 25µm.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An amine rich liquid filter cartridge backflush device characterized by, include: Solvent recovery tank, impurity filter tank, rich amine flash tank, rich amine pump, rich amine filtration system, regeneration tower bottom pump, solvent regeneration tower, lean amine pump, lean amine solution tank and low-saturation gas desulfurization tower; The solvent recovery tank, impurity filter tank, rich amine flash tank, rich amine pump, rich amine filtration system, solvent regeneration tower, regeneration tower bottom pump, lean amine solution tank and low-separation gas desulfurization tower are connected in sequence. The low-saturation gas desulfurization tower is also connected to the amine-rich liquid flash tank. The amine-rich liquid filtration system is also connected to a solvent recovery tank.

2. An amine rich liquid filter cartridge backflush device according to claim 1, characterized in that Also includes: Impurity storage tank; The impurity storage tank is connected to the impurity filter tank.

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