A solvent regenerator column employing a light-heavy float valve tray

Abstract

The utility model provides a kind of solvent regenerator using light and heavy float valve type tray, the tray of this solvent regenerator all uses float valve type tray, and float valve uses light and heavy valve design;Among them, the form of tray is double overflow weir form, the downcomer of odd-numbered layer tray is arranged at both sides, and the downcomer of even-numbered layer tray is arranged at center;Two rows of light float valve, one row of heavy float valve are arranged in the direction of self-liquid phase inflow on tray in turn, two rows of light float valve are matched with one row of heavy float valve as a group, three groups on each side in rectifying section, four groups on each side in stripping section.Advantages are prominent in the case where processing capacity reduces.Light and heavy float valve type tray is used when ordinary float valve type tray is in low processing capacity, and operation stability is greatly reduced, and leakage and other problems are prone to occur, while light and heavy float valve type tray can maintain stable operation, and there is no leakage phenomenon, which can fully reflect its excellent operation flexibility, so that the device can adapt to more extensive production conditions.

Description

Technical Field

[0001] This utility model belongs to the field of chemical production technology, specifically relating to a solvent regeneration tower using a light-heavy floating valve tray. Background Technology

[0002] Regeneration towers are crucial equipment in chemical production. Solvent regeneration towers are used to regenerate absorbents, and the type of floating valve on the trays directly affects the regeneration efficiency, quality, and energy consumption. Traditional solvent regeneration towers often use fixed orifice plates or ordinary floating valve trays, which suffer from insufficient gas-liquid contact, low mass transfer efficiency, and large pressure drop, resulting in poor regeneration performance and high energy consumption.

[0003] The original solvent regeneration tower used F1 type floating valve trays. When the rich liquid volume increased and the gas and liquid volumes fluctuated significantly, the equilibrium state of the entire solvent regeneration tower was disrupted, which easily led to liquid blockage. When the rich liquid volume decreased and the gas and liquid volumes fluctuated significantly, it easily led to liquid leakage. As a result, the gas and liquid could not be effectively separated, thus affecting the operation of the entire tower. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] This invention proposes a solvent regeneration tower using a light-heavy floating valve tray to solve the technical problem of how to improve the mass transfer efficiency and effect of the regeneration tower while reducing the throughput and energy consumption.

[0006] (II) Technical Solution

[0007] To address the aforementioned technical problems, this utility model proposes a solvent regeneration tower employing a light-heavy floating valve tray. All trays in this tower are floating valve trays, with the floating valves designed as light and heavy valves. The trays are in a double overflow weir configuration, with downcomers for odd-numbered trays located on both sides and downcomers for even-numbered trays located in the center. Two rows of light floating valves and one row of heavy floating valves are arranged sequentially on the trays, starting from the liquid inflow direction. Two rows of light floating valves paired with one row of heavy floating valves form a group, with three groups on each side of the rectifying section and four groups on each side of the stripping section.

[0008] Furthermore, the number of light and heavy float valves differs in the odd and even layer trays.

[0009] Furthermore, all 23 trays of the solvent regeneration tower are floating valve trays.

[0010] Furthermore, in the solvent regeneration tower, the first and third trays have 354 light float valves and 170 heavy float valves; the second tray has 342 light float valves and 182 heavy float valves; the odd-numbered trays from the fifth to the 21st trays have 472 light float valves and 224 heavy float valves; the even-numbered trays from the fourth to the 22nd trays have 456 light float valves and 240 heavy float valves; and the 23rd tray has 472 light float valves and 224 heavy float valves.

[0011] (III) Beneficial Effects

[0012] This invention proposes a solvent regeneration tower employing a light-heavy floating valve tray system. All trays in this tower are floating valve trays, with a light-heavy valve design. The trays are in a double overflow weir configuration, with downcomers on both sides of odd-numbered trays and in the center of even-numbered trays. Two rows of light floating valves and one row of heavy floating valves are arranged sequentially on the trays, starting from the liquid inflow direction. Two rows of light floating valves paired with one row of heavy floating valves form a group, with three groups on each side of the rectifying section and four groups on each side of the stripping section. The advantages of using a light-heavy floating valve tray system are significant when throughput is reduced. Ordinary floating valve trays experience a significant decrease in operational stability at low throughputs, easily leading to leakage problems. In contrast, the light-heavy floating valve tray system maintains stable operation without leakage, fully demonstrating its superior operational flexibility and enabling the unit to adapt to a wider range of production conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the solvent regeneration tower of the present invention, which uses a light and heavy floating valve tray.

[0014] Figure 2 This is a schematic diagram of the odd-numbered layer tower plate structure in this utility model;

[0015] Figure 3 The average steam consumption was 0.35 MPa before the modification.

[0016] Figure 4 This represents the average steam consumption at 0.35 MPa after the modification. Detailed Implementation

[0017] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0018] This embodiment proposes a solvent regeneration tower using a light-heavy floating valve tray, the overall structure of which is as follows: Figure 1 As shown, all 23 original trays of the solvent regeneration tower T-101 were replaced with ADV floating valve trays, with the floating valves using a light and heavy valve design.

[0019] The solvent regeneration tower has 354 light float valves and 170 heavy float valves on trays 1 and 3; 342 light float valves and 182 heavy float valves on tray 2; 472 light float valves and 224 heavy float valves on odd-numbered trays from trays 5 to 21; 456 light float valves and 240 heavy float valves on even-numbered trays from trays 4 to 22; and 472 light float valves and 224 heavy float valves on tray 23.

[0020] The lighter float valve has a lighter valve body and can be opened at lower gas velocities; the heavier float valve has a heavier valve body and is suitable for higher gas velocities, thus achieving good gas-liquid contact at different gas velocities.

[0021] According to design requirements, to ensure good hydraulic performance of the tower internals within a load range of 30-75% of the original design values, the overall tower pressure drop should be ≤20 kPa, and the H2S concentration in the lean liquor at the bottom of the tower should be ≤1.0 g / L. Based on experience, the open area ratio of the rectifying section is determined to be 6%, and the open area ratio of the stripping section is determined to be 8%. Substituting these values ​​into the hydraulic calculation formula satisfies the requirements. After correction, the open area ratio of the rectifying section is confirmed to be 6.15%, and the open area ratio of the stripping section is 8.16%.

[0022] Layers 1-3 (rectification section): The porosity is relatively low (6.15%) because the gas load is small here, and the gas velocity needs to be controlled to avoid mist entrainment or flooding. A smaller porosity can improve mass transfer efficiency.

[0023] Layers 4-23 (stripping section): The porosity is relatively high (8.16%). Due to the increased liquid load, a larger gas phase channel is required to reduce the pressure drop while ensuring mass transfer efficiency.

[0024] The allocation of light and heavy valves was determined through hydraulic calculations and comprehensive consideration of process requirements, primarily taking into account factors such as gas-liquid phase load, pressure drop, mass transfer efficiency, and operational flexibility. Ultimately, a heavy valve ratio of 30-35% was determined to meet the orifice kinetic energy factor requirements.

[0025] The tray configuration is a double overflow weir type, meaning the downcomers for odd-numbered trays are located on both sides, while those for even-numbered trays are located in the center. To ensure uniform contact between the gas and liquid phases on the trays and improve mass transfer efficiency, two rows of light float valves and one row of heavy float valves are arranged sequentially on the trays starting from the liquid inflow direction. Two rows of light float valves paired with one row of heavy float valves form a group. There are three groups on each side for trays 1-3 (rectification section), and four groups on each side for trays 4-23 (stripping section). The slight difference in the number of light and heavy float valves between odd and even trays is due to the different positions of the downcomers in this double overflow weir configuration. Overall, the requirement of a heavy valve ratio of 30-35% is met.

[0026] The solvent regeneration tower of the sulfur plant was originally designed with a maximum capacity of 300 t / h. Before the modification, to ensure the normal operation of the solvent regeneration tower, the minimum capacity could only be reduced to 150 t / h. Of this, approximately 100 t / h of lean solvent was sent to the desulfurization unit, and approximately 50 t / h of lean solvent was internally circulated. This internally circulated solvent resulted in a waste of 0.35 MPa steam. Therefore, the solvent regeneration tower was optimized and modified. The original 23 trays of the T-101 solvent regeneration tower were all replaced with ADV floating valve trays, and the floating valves adopted a light-weight valve design. After the modification, the original internal circulation of the solvent regeneration tower was completely shut off, and the feed rate was reduced to approximately 110 t / h. The liquid level in the regeneration tower was stable, and no leakage occurred. Before the modification, the average consumption of 0.35 MPa steam was 16.97 t / h. Figure 3 As shown, after the modification, the average steam consumption at 0.35MPa is 12.43t / h. Figure 4 As shown, it saves 4.54 t / h of 0.35 MPa steam. After the solvent regeneration tower was modified, it has been running continuously for many months with qualified lean liquor quality, no abnormal operating conditions, and good operating status.

[0027] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A solvent regeneration tower employing a light-heavy floating valve tray, characterized in that, The solvent regeneration tower uses all floating valve trays, with light and heavy valves. The trays are double overflow weirs, with downcomers on both sides of odd-numbered trays and in the center of even-numbered trays. Two rows of light floating valves and one row of heavy floating valves are arranged sequentially on the trays starting from the direction of liquid inflow. Two rows of light floating valves are paired with one row of heavy floating valves as a group. There are three groups on each side of the rectification section and four groups on each side of the stripping section.

2. The solvent regeneration tower using light and heavy floating valve trays as described in claim 1, characterized in that, The number of light and heavy float valves differs in odd and even layer trays.

3. The solvent regeneration tower using light and heavy floating valve trays as described in claim 1, characterized in that, All 23 trays of the solvent regeneration tower are floating valve trays.

4. The solvent regeneration tower using light and heavy floating valve trays as described in claim 1, characterized in that, The solvent regeneration tower has 354 light float valves and 170 heavy float valves on trays 1 and 3; 342 light float valves and 182 heavy float valves on tray 2; 472 light float valves and 224 heavy float valves on odd-numbered trays from trays 5 to 21; 456 light float valves and 240 heavy float valves on even-numbered trays from trays 4 to 22; and 472 light float valves and 224 heavy float valves on tray 23.

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