Matrix combination oxidation regeneration device

Abstract

The present invention provides a matrix-type combined oxidation and regeneration device, which is composed of a plurality of small-sized oxidation and regeneration towers. The invention is characterized in that: the plurality of small-sized oxidation and regeneration towers are divided into M rows and connected in parallel, and each row is composed of N small-sized oxidation and regeneration towers connected in series to form a multi-stage oxidation and regeneration device; the multi-stage oxidation and regeneration device composed of N small-sized oxidation and regeneration towers connected in series comprises first to N-stage small-sized oxidation and regeneration towers, wherein the first-stage small-sized oxidation and regeneration tower is connected to an outlet manifold of an absorption tower, two adjacent small-sized oxidation and regeneration towers are connected by overflow pipes respectively, the bottom of the first-stage small-sized oxidation and regeneration tower is connected to a filter through a first-stage sulfur slurry pump, the bottoms of other small-sized oxidation and regeneration towers are respectively connected to the first-stage small-sized oxidation and regeneration tower or the preceding small-sized oxidation and regeneration tower through sulfur slurry pumps, and the N-stage small-sized oxidation and regeneration tower is connected to a lean liquid inlet manifold of an absorption tower through a lean liquid pump.

Description

Technical Field

[0001] The invention relates to a matrix-type combined oxidation regeneration device, which is particularly suitable for oxidation regeneration of iron catalysts in a double-tower desulfurization process using a liquid-phase oxidation-reduction method. Background Art

[0002] The traditional liquid phase oxidation-reduction double tower desulfurization process (LO-CAT process) mainly includes an absorption tower, an oxidation regeneration device, and usually also includes a sulfur slurry concentration and purification device. The system diagram is shown in the attached Figure 1 The existing designs of oxidation regeneration devices are as follows: 1. Using a large-capacity oxidation regeneration device, the disadvantages are: low operational flexibility and difficulty in skid mounting. 2. Using multiple small-capacity oxidation regeneration devices in parallel, the disadvantages are: a large number of matching pumps and flow control valve groups, difficult to control bias flow, and inconvenient operation. Summary of the invention

[0003] Therefore, the object of the present invention is to provide a matrix-type combined oxidation regeneration device suitable for oxidation regeneration of iron catalysts in a double-tower desulfurization process using a liquid-phase oxidation-reduction method.

[0004] The matrix-type combined oxidation regeneration device provided by the present invention is composed of a plurality of small oxidation regeneration towers, which are divided into M columns and connected in parallel, and each column is composed of N small oxidation towers connected in series to form a multi-stage oxidation regeneration device; the multi-stage oxidation regeneration device composed of N small oxidation towers in series includes first to N-stage small oxidation regeneration towers, wherein the first-stage small oxidation regeneration tower is connected to the outlet manifold of the absorption tower, and the two adjacent small oxidation regeneration towers are connected by overflow pipes respectively, the bottom of the first-stage small oxidation regeneration tower is connected to the filter through a first-stage sulfur slurry pump, and the bottoms of other small oxidation regeneration towers are respectively connected to the first-stage small oxidation regeneration tower or the front-stage small oxidation regeneration tower through sulfur slurry pumps, and the N-stage small oxidation regeneration tower is connected to the lean liquid inlet manifold of the absorption tower through a lean liquid pump.

[0005] Furthermore, the multi-stage oxidation regeneration device consisting of N small oxidation towers connected in series includes a jet pump, whose inlet is connected to the middle of the Nth stage small oxidation regeneration tower, and whose outlet is simultaneously connected to the spray device at the top of each stage of the small oxidation regeneration tower.

[0006] Furthermore, the multi-stage oxidation regeneration device consisting of N small oxidation towers connected in series includes an air compressor, the outlet of which is simultaneously connected to the bottom of each stage of the small oxidation regeneration tower.

[0007] Furthermore, each N-th stage small oxidation regeneration tower is connected to a lean liquid main pipe through a lean liquid pump, and the lean liquid main pipe is connected to a lean liquid inlet manifold of the absorption tower, wherein a flow meter and a flow control valve are provided on the lean liquid main pipe.

[0008] Furthermore, a flow meter and a flow control valve are provided between the first-stage small oxidation regeneration tower and the outlet manifold of the absorption tower in the multi-stage oxidation regeneration device composed of N small oxidation towers connected in series.

[0009] The beneficial effects of the present invention are that the process operation is flexible, adapts to the working conditions of desulfurization solutions with different concentrations, can reduce the number of pumps and flow control valve groups, is easy to control the problem of bias flow, and is more convenient to operate. It is suitable for customized production and skid-mounting.

[0010] The present invention is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the system structure of the LO-CAT process.

[0012] Figure 2 It is a schematic diagram of the system structure of the first embodiment.

[0013] Figure 3 It is a schematic diagram of the system structure of the second embodiment. DETAILED DESCRIPTION

[0014] Embodiment 1:

[0015] This embodiment provides a matrix-type combined oxidation regeneration device, see the attached Figure 2 In this embodiment, the rich liquid from the outlet manifold of the absorption tower is 560m 3 / h, designed sulfur capacity 1.5g (H2S) / L (desulfurization solution), desulfurization solution circulation volume 560m 3 / h, the sulfur scale is 15t / d. According to the sulfur scale, a matrix-type combined oxidation regeneration device described in this embodiment is composed of 10 small oxidation regeneration towers divided into 5 columns in parallel, and each column is composed of 2 small oxidation towers in series to form a secondary oxidation regeneration device, and the sulfur processing capacity of each column is 3t / d.

[0016] The two-stage oxidation regeneration device composed of two small oxidation towers connected in series (taking the first row as an example) described in this embodiment includes a first-stage small oxidation regeneration tower T-101A and a second-stage small oxidation regeneration tower T-102A. The first-stage small oxidation regeneration tower T-101A is connected to the outlet manifold of the absorption tower, and the first-stage small oxidation regeneration tower T-101A and the second-stage small oxidation regeneration tower T-102A are connected by an overflow pipe, and the interface position of the overflow pipe and the first-stage small oxidation regeneration tower T-101A is higher than the interface position of the overflow pipe and the second-stage small oxidation regeneration tower T-102A.

[0017] The bottom of the first stage small oxidation regeneration tower T-101A is connected to the vacuum filter through the first stage sulfur slurry pump P-101A, and enters the sulfur slurry concentration and purification device after filtration. The bottom of the second stage small oxidation regeneration tower T-102A is connected to the first stage small oxidation regeneration tower T-101A through the sulfur slurry pump P-102A, and the second stage small oxidation regeneration tower T-102A is connected to the absorption tower lean liquid inlet manifold through the lean liquid pump P-104A.

[0018] The two-stage oxidation regeneration device composed of two small oxidation towers connected in series described in this embodiment also includes a jet pump P-103A, whose inlet is connected to the middle of the second-stage small oxidation regeneration tower T-102A, and whose outlet is simultaneously connected to the spray devices at the top of the two small oxidation regeneration towers T-102A and T-102A.

[0019] The two-stage oxidation regeneration device composed of two small oxidation towers connected in series in this embodiment also includes an air compressor BL-101A, whose outlet is simultaneously connected to the bottom of each level of small oxidation regeneration towers T-102A and T-102A.

[0020] In the matrix-type combined oxidation regeneration device described in this embodiment, each second-stage small oxidation regeneration tower T-102A, T-102B, T-102C, T-102D, and T-102E are connected to the lean liquid main pipe through lean liquid pumps P-104A, P-104B, P-104C, P-104D, and P-104E, and the lean liquid main pipe is connected to the lean liquid inlet manifold of the absorption tower. A flow meter and a flow control valve FV102 are provided on the lean liquid main pipe, and its flow setting value is 560m 3 / h.

[0021] In the matrix-type combined oxidation regeneration device described in this embodiment, flow meters and flow control valves FV101A, FV101B, FV101C, and FV101D are respectively provided between the four first-stage small oxidation regeneration towers T-101A, T-101B, T-101C, and T-101D and the outlet manifold of the absorption tower, and the flow setting value is 112m 3 / h, and only a flow meter is installed between the first-stage small oxidation regeneration tower T-101E and the outlet manifold of the absorption tower.

[0022] The working process of the matrix-type combined oxidation regeneration device described in this embodiment is as follows: the rich liquid from the outlet manifold of the absorption tower is evenly divided into 5 paths and enters 5 primary oxidation towers T-101A, T-101B, T-101C, T-101D, and T-101E respectively. Most of the sulfur in the rich liquid settles in the primary oxidation towers T-101A, T-101B, T-101C, T-101D, and T-101E, and passes through the primary sulfur at the bottom of the tower. The slurry pumps P-101A, P-101B, P-101C, P-101D, and P-101E enter the downstream vacuum filter, and the solution and remaining sulfur in the upper part of the primary oxidation tower T-101A, T-101B, T-101C, T-101D, and T-101E respectively enter the corresponding secondary oxidation tower T-102A, T-102B, T-102C, T-102D, and T-102E through the corresponding overflow pipes for secondary precipitation. The reduced sulfur is returned to the corresponding primary oxidation towers T-101A, T-101B, T-101C, T-101D, T-101E through the secondary sulfur slurry pumps P-102A, P-102B, P-102C, P-102D, and P-102E at the bottom of the tower. A part of the lean liquid in the middle of the secondary oxidation towers T-102A, T-102B, T-102C, T-102D, and T-102E is pumped through the jet pumps P-103A, P-104A, P-105B, P-106C, P-107D, P-108E. The liquids P-3B, P-103C, P-103D, and P-103E enter the corresponding primary oxidation towers T-101A, T-101B, T-101C, T-101D, and T-101E and the tops of the secondary oxidation towers T-102A, T-102B, T-102C, T-102D, and T-102E respectively, and are sprayed on the surface of the solution to defoam. The other part is pressurized by the lean liquid pumps A / B / C / D / E and then returns to the absorption tower for desulfurization.

[0023] Compared with the conventional 1x10 solution, the 2x5 solution can reduce 10 pumps and 5 sets of flow control valve groups. Due to the reduction in the number of parallel columns, the problem of bias flow is easier to solve and the operation is more convenient. It is also conducive to uniform solution oxidation regeneration, solving the problems of over-oxidation and under-oxidation, making desulfurization cleaner and the device operation more stable. At the same time, it avoids the problem of reagent degradation caused by excessive solution oxidation, which is conducive to reducing reagent consumption and reducing the operating cost of the device.

[0024] Embodiment 2:

[0025] This embodiment provides a matrix-type combined oxidation regeneration device, see the attached Figure 3 In this embodiment, the rich liquid from the outlet manifold of the absorption tower is 504m 3 / h, designed sulfur capacity 2.0g (H2S) / L (desulfurization solution), desulfurization solution circulation volume 504m 3 / h, the sulfur scale is 18t / d. According to the sulfur scale, a matrix-type combined oxidation regeneration device described in this embodiment is composed of 9 small oxidation regeneration towers divided into 3 parallel columns, each column is composed of 3 small oxidation towers connected in series to form a three-stage oxidation regeneration device, and the sulfur processing capacity of each column is 6t / d.

[0026] The three-stage oxidation regeneration device (taking the first row as an example) composed of three small oxidation towers connected in series in this embodiment includes a first-stage small oxidation regeneration tower T-201A, a second-stage small oxidation regeneration tower T-202A and a third-stage small oxidation regeneration tower T-203A. The first-stage small oxidation regeneration tower T-201A is connected to the outlet manifold of the absorption tower. The first-stage small oxidation regeneration tower T-201A and the second-stage small oxidation regeneration tower T-202A are connected by an overflow pipe. The interface position of the overflow pipe with the first-stage small oxidation regeneration tower T-201A is relatively high, and the interface position with the second-stage small oxidation regeneration tower T-202A is relatively low. The second-stage small oxidation regeneration tower T-202A and the third-stage small oxidation regeneration tower T-203A are connected by an overflow pipe. The interface position of the overflow pipe with the second-stage small oxidation regeneration tower T-202A is higher than the interface position of the overflow pipe with the third-stage small oxidation regeneration tower T-203A.

[0027] The bottom of the first-stage small oxidation regeneration tower T-201A is connected to the plate-frame filter through the first-stage sulfur slurry pump P-201A, and enters the sulfur slurry concentration and purification device after filtration. The bottoms of the second-stage small oxidation regeneration tower T-202A and the third-stage small oxidation regeneration tower T-203A are connected to the first-stage small oxidation regeneration tower T-201A through the second-stage sulfur slurry pump P-202A and the third-stage sulfur slurry pump P-203A, respectively. The third-stage small oxidation regeneration tower T-203A is connected to the absorption tower lean liquid inlet manifold through the lean liquid pump P-205A.

[0028] The three-stage oxidation regeneration device composed of three small oxidation towers connected in series described in this embodiment also includes a jet pump P-204A, whose inlet is connected to the middle of the third-stage small oxidation regeneration tower T-203A, and whose outlet is simultaneously connected to the spray devices at the top of the three small oxidation regeneration towers T-201A, T-202A, and T-203A.

[0029] The three-stage oxidation regeneration device composed of three small oxidation towers connected in series in this embodiment also includes an air compressor BL-201A, whose outlet is simultaneously connected to the bottom of the three small oxidation regeneration towers T-201A, T-202A, and T-203A.

[0030] In the matrix-type combined oxidation regeneration device described in this embodiment, flow meters and flow control valves FV201A are respectively provided between the two first-stage small oxidation regeneration towers A1 and B1 and the outlet manifold of the absorption tower, and the flow setting values ​​are both 168m3 / h. In addition, only a flow meter is installed between the first-stage small oxidation regeneration tower C1 and the outlet manifold of the absorption tower.

[0031] The working process of a matrix-type combined oxidation regeneration device described in this embodiment is as follows: the rich liquid from the outlet manifold of the absorption tower is evenly divided into three routes and enters three primary oxidation towers T-201A, T-201B, and T-201C respectively; most of the sulfur in the rich liquid settles in the primary oxidation towers T-201A, T-201B, and T-201C, and enters the downstream plate and frame filter through the primary sulfur slurry pump P-201A, P-201B, and P-201C at the bottom of the tower; the solution and the remaining sulfur in the upper part of the primary oxidation towers P-201A, P-201B, and P-201C respectively pass through the corresponding overflow pipes and enter the corresponding secondary oxidation towers P-202A, P-202B, and P-202C for secondary sedimentation; the secondary sedimentation The descending sulfur returns to the corresponding primary oxidation tower T-201A, T-201B, T-201C through the secondary sulfur slurry pumps P-202A, P-202B, P-202C at the bottom of the tower, the solution and remaining sulfur in the upper part of the secondary oxidation tower P-202A, P-202B, P-202C enter the corresponding tertiary oxidation tower P-203A, P-203B, P-203C through the corresponding overflow pipes, and the sulfur that settles for the third time returns to the corresponding primary oxidation tower T-201A, T-201B, T-201C through the tertiary sulfur slurry pumps P-203A, P-203B, P-203C at the bottom of the tower, and can also return to the corresponding secondary oxidation tower T-202A, T-202B, T-202C.

[0032] Part of the lean liquid in the tertiary oxidation towers T-203A, T-203B, and T-203C enters the top of each small oxidation tower through the jet pumps P-204A, P-204B, and P-204C, and is sprayed on the surface of the solution to defoam, and part of it is pressurized by the lean liquid pumps P-205A, P-205B, and P-205C and then returned to the absorption tower for desulfurization.

[0033] Compared with the conventional 1x10 solution, the 3x3 solution can reduce 15 pumps and 7 sets of flow control valve groups. In addition, due to the fewer parallel columns, the problem of bias flow is easier to solve and the operation is more convenient. It is also conducive to uniform solution oxidation regeneration, solving the problems of over-oxidation and under-oxidation, making desulfurization cleaner and the device operation more stable. At the same time, it avoids the problem of reagent degradation caused by excessive solution oxidation, which is conducive to reducing reagent consumption and reducing the operating cost of the device.

[0034] The above embodiments are only preferred specific implementation methods for fully illustrating the present invention, and are not intended to limit the protection scope of the present invention. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the contents recorded in the claims.

Claims

1. A matrix-type oxidation regeneration device, composed of a plurality of small oxidation regeneration towers, characterized in that: Multiple small oxidation regeneration towers are divided into M rows and connected in parallel, and each row is composed of N small oxidation towers connected in series to form a multi-stage oxidation regeneration device; The multi-stage oxidation regeneration device composed of N small oxidation towers connected in series comprises first to N-stage small oxidation regeneration towers, wherein the first-stage small oxidation regeneration tower is connected to the outlet manifold of the absorption tower, and the two adjacent small oxidation regeneration towers are connected by overflow pipes respectively, the bottom of the first-stage small oxidation regeneration tower is connected to the filter through a first-stage sulfur slurry pump, and the bottoms of the other small oxidation regeneration towers are connected to the first-stage small oxidation regeneration tower or the preceding small oxidation regeneration tower through sulfur slurry pumps respectively, and the N-stage small oxidation regeneration tower is connected to the lean liquid inlet manifold of the absorption tower through a lean liquid pump; The multi-stage oxidation regeneration device composed of N small oxidation towers connected in series includes a jet pump, the inlet of which is connected to the middle of the Nth stage small oxidation regeneration tower, and the outlet of which is simultaneously connected to the spray device at the top of each stage of the small oxidation regeneration tower; The multi-stage oxidation regeneration device consisting of N small oxidation towers connected in series includes an air compressor, the outlet of which is simultaneously connected to the bottom of each stage of the small oxidation regeneration tower; Each N-th stage small oxidation regeneration tower is connected to a lean liquid main pipe through a lean liquid pump, and the lean liquid main pipe is connected to the lean liquid inlet manifold of the absorption tower, wherein a flow meter and a flow control valve are provided on the lean liquid main pipe; A flow meter and a flow control valve are arranged between the first-stage small oxidation regeneration tower and the outlet manifold of the absorption tower in the multi-stage oxidation regeneration device composed of N small oxidation towers connected in series.

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