Desulfurization device with automatic water replenishing structure

Abstract

The utility model discloses a desulfurization device with an automatic water replenishing structure, which relates to the technical field of natural gas desulfurization devices, and comprises a desulfurization absorption tower and a desulfurization regeneration tower which are communicated with each other through a pipeline, the bottom of the desulfurization regeneration tower is connected with a water replenishing pipeline, and the water replenishing pipeline is connected with a regulating valve; a barren liquor pipeline and a rich liquor output pipeline are connected between the desulfurization regeneration tower and the desulfurization absorption tower; the barren liquor pipeline is used for conveying liquid discharged from the bottom of the desulfurization regeneration tower into the desulfurization absorption tower, and the barren liquor pipeline is sequentially communicated with the system equipment and the reflux pump according to the flowing direction of the liquid; the rich liquid output pipeline is used for conveying liquid in the desulfurization absorption tower into the desulfurization regeneration tower, and the desulfurization flash tank and the system equipment are sequentially communicated onto the rich liquid output pipeline according to the flow direction of the liquid; a first flow meter, a water content online analyzer and a third flow meter are mounted on the barren liquor pipeline; and a second flow meter is mounted on the water replenishing pipeline. Automatic operation of solution water replenishing is achieved, the labor intensity of operators is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas desulfurization devices, in particular to a desulfurization device with an automatic water replenishment structure. Background Art

[0002] The raw natural gas is desulfurized and dehydrated to become product natural gas for export. The function of the desulfurization device is to remove hydrogen sulfide, organic sulfur and part of carbon dioxide from the raw natural gas, and it is a key device to achieve qualified export of product natural gas. In the desulfurization device, the desulfurization solution is an amine solution, which absorbs hydrogen sulfide, organic sulfur and part of carbon dioxide in the raw natural gas and is recycled through flash evaporation, filtration, regeneration and other processes. Since the regeneration conditions are low pressure and high temperature, a large amount of water in the solution will be lost during the solution regeneration process. Although part of the water can be recovered by subsequent cooling of the regenerated gas, the recovered amount is not enough to keep the solution solubility unchanged, and it is necessary to continuously add water during the production process.

[0003] Currently, water replenishment is usually done manually, and the basis for operation adjustment is regular manual analysis data of the water content of the solution.

[0004] Due to the limited frequency of division of labor analysis and the lag of analysis data, operators need to perform water replenishment operations based on experience. At the same time, the solubility of the solution needs to be strictly controlled. Too high or too low solubility will affect the effect of the solution on absorbing hydrogen sulfide, organic sulfur and part of carbon dioxide in natural gas, affecting the content of hydrogen sulfide, carbon dioxide and total sulfur in the product natural gas. In severe cases, the content of hydrogen sulfide, carbon dioxide and total sulfur in natural gas will exceed the standard, resulting in unqualified product natural gas, stopping external transmission and flaring, resulting in waste of resources. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the existing natural gas desulfurization device cannot realize automatic water replenishment, resulting in the inability to strictly control the solution concentration, which in turn affects the quality of the product natural gas. Based on this, a desulfurization device with an automatic water replenishment structure is proposed. The desulfurization device realizes automatic operation of solution water replenishment, replaces manual water replenishment operation, reduces the labor intensity of operators, and improves work efficiency.

[0006] The utility model is realized by the following technical solutions:

[0007] The present application provides a desulfurization device with an automatic water replenishment structure, comprising a desulfurization absorption tower and a desulfurization regeneration tower interconnected by a pipeline, a water replenishment pipeline is connected to the bottom of the desulfurization regeneration tower, and a regulating valve is connected to the water replenishment pipeline;

[0008] A lean liquid pipeline and a rich liquid pipeline are connected between the desulfurization regeneration tower and the desulfurization absorption tower; a lean liquid pipeline is connected between the desulfurization regeneration tower and the desulfurization flash tank;

[0009] The rich liquid output pipeline is used to transport the liquid in the desulfurization absorption tower to the desulfurization regeneration tower. According to the liquid flow direction, the rich liquid output pipeline is connected to the desulfurization flash tank and system equipment in sequence;

[0010] The lean liquid pipeline is used to transport the liquid discharged from the bottom of the desulfurization regeneration tower to the packing columns of the desulfurization absorption tower and the desulfurization flash tank. According to the liquid flow direction, the lean liquid pipeline is connected to system equipment and solution pumps in sequence; the lean liquid pipeline is equipped with a first flow meter, an online water content analyzer, and a third flow meter, and the first flow meter and the third flow meter are connected to an adder with numerical signals; the online water content analyzer is connected to a subtractor with a numerical signal, and the adder and the subtractor are both connected to multiplier 1 and multiplier 2 with numerical signals; the water make-up pipeline is equipped with a second flow meter, and the second flow meter is connected to a PID regulator with a numerical signal.

[0011] Working principle: The measured value of the water content online analyzer is subtracted from the set value of the solution concentration in the subtractor (the set value of the water content in the solution is converted by the set value of the solution concentration, and it is used as the minuend and the measured value is used as the subtrahend), and the difference ΔC in the solution concentration is obtained. The lean liquid entering the desulfurization absorption tower and the lean liquid flow entering the flash tower are added in the adder to obtain the total lean liquid circulation volume of the desulfurization device. The lean liquid is multiplied by the correction coefficient K (considering the amount of solution in the desulfurization absorption tower, regeneration tower, flash tank and other equipment) in the multiplier 1, and the output value is the theoretical solution volume of the desulfurization system. The output value is then multiplied by the solution concentration difference ΔC in the multiplier to obtain the theoretical water replenishment volume. The theoretical water replenishment volume is used as the set value of the PID regulator. The PID regulator controls the action of the regulating valve after performing PID calculation based on the difference between the set value and the water replenishment flow, thereby realizing automatic water replenishment control.

[0012] Furthermore, the desulfurization device also includes an adder, a first multiplier, a second multiplier, a PID regulator, and a subtractor.

[0013] Furthermore, the first flow meter, the water content online analyzer, the second flow meter, the third flow meter, and the regulating valve are all connected to the controller via signal lines.

[0014] Furthermore, the adder, multiplier 1, multiplier 2, PID regulator, and subtractor are all functional blocks inside the controller, and the numerical signal connection between the functional blocks is realized by program configuration in the controller.

[0015] Furthermore, the controller includes any one of PLC, RTU, DSC, and SIS.

[0016] Furthermore, the solution pump is installed in a redundant configuration or in multiple configurations.

[0017] Furthermore, a regulating valve is installed on the water supply pipeline, the regulating valve is provided with a bypass pipeline, and the bypass pipeline is also provided with a manual valve; manual valves are provided before and after the regulating valve; both ends of the bypass pipeline are connected to the water supply pipeline, and the regulating valve is located between the connection point of the bypass pipeline and the water supply pipeline.

[0018] Furthermore, the system equipment includes a filter, a heat exchanger and a cooler which are interconnected.

[0019] Furthermore, a check valve is connected to the water supply pipeline. By connecting the check valve to the water supply pipeline, the toxic medium in the desulfurization regeneration tower can be prevented from entering the water supply pipeline.

[0020] Furthermore, the water content online analyzer is installed on the lean liquid pipeline between the system equipment and the reflux pump.

[0021] The lean liquid medium on this pipe section has the lowest pressure and temperature in the entire lean liquid pipe section, which can greatly reduce the requirements and equipment facilities of the water content online analyzer for cooling and pressure reduction in the sample pretreatment system, thereby simplifying the sample pretreatment system and reducing the procurement and operation costs of the online analyzer.

[0022] Furthermore, the water supply pipeline is connected to the bottom of the desulfurization regeneration tower, and the bottom of the desulfurization regeneration tower is the liquid storage section at the bottom of the desulfurization regeneration tower. This connection position avoids the regeneration area in the upper middle part of the desulfurization regeneration tower, thereby avoiding the loss of the replenished water due to regeneration evaporation and the impact on the solution regeneration quality.

[0023] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0024] (1) The desulfurization device in the present application realizes the automatic operation of solution water replenishment, replacing the manual water replenishment operation, reducing the labor intensity of operators and improving work efficiency;

[0025] (2) The desulfurization device in the present application solves the problems of delayed, untimely and improper operation of water replenishment operation, realizes precise water replenishment, makes the adjustment of solution concentration timely and accurate, improves the stability of the operation of the desulfurization device, reduces and avoids the occurrence of unqualified product natural gas, venting and combustion, and waste of resources due to solution solubility, ensures the safe and stable operation of the desulfurization device, improves work efficiency, reduces manual labor intensity, and reduces safety risks;

[0026] (3) The desulfurization device in this application can be applied to existing natural gas desulfurization, industrial tail gas desulfurization, tail gas treatment, etc., and can be widely used in the petroleum, chemical, thermal power generation and other industries, and has the advantages of a wide range of applications and good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0028] Figure 1 It is a structural schematic diagram of a desulfurization device with an automatic water replenishment structure in the utility model.

[0029] Marks and corresponding parts names in the attached drawings:

[0030] 01-desulfurization absorption tower, 02-lean liquid pipeline, 03-first flowmeter, 04-multiplier one, 05-multiplier two, 06-subtractor, 07-water content online analyzer, 08-desulfurization regeneration tower, 09-PID regulator, 10-second flowmeter, 11-water supply pipeline, 12-branch pipe, 13-regulating valve, 14-rich liquid delivery pipeline, 15-system equipment, 16-third flowmeter, 17-solution pump, 18-desulfurization flash tank, 19-adder, 20-check valve. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, a connection or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment provides a desulfurization device with an automatic water replenishment structure, including a desulfurization absorption tower 01 and a desulfurization regeneration tower 08 interconnected by a pipeline, a water replenishment pipeline 11 is connected to the bottom of the desulfurization regeneration tower 08, and a regulating valve 13 is connected to the water replenishment pipeline 11;

[0037] A lean liquid pipeline 02 and a rich liquid pipeline 14 are connected between the desulfurization regeneration tower 08 and the desulfurization absorption tower 01; a lean liquid pipeline 02 is connected between the desulfurization regeneration tower 08 and the desulfurization flash tank 18;

[0038] The rich liquid pipeline 14 is used to transport the liquid in the desulfurization absorption tower 01 to the desulfurization regeneration tower 08. According to the flow direction of the liquid, the rich liquid output pipeline 14 is connected to the desulfurization flash tank 18 and the system equipment 15 in sequence;

[0039] The lean liquid pipeline 02 is used to transport the liquid discharged from the bottom of the desulfurization regeneration tower 08 to the packing columns of the desulfurization absorption tower 01 and the desulfurization flash tank 18. According to the liquid flow direction, the lean liquid pipeline 02 is connected to the system equipment 15 and the solution pump 17 in sequence; the lean liquid pipeline 02 is installed with a first flow meter 03, an online water content analyzer 07, and a third flow meter 16, and the first flow meter 03 and the third flow meter 16 are connected to an adder 19 with numerical signals; the online water content analyzer 07 is connected to a subtractor 06 with a numerical signal, and the adder 19 and the subtractor 06 are both connected to a multiplier 1 04 and a multiplier 2 05 with numerical signals; the water supply pipeline 11 is installed with a second flow meter 10, and the second flow meter 10 is connected to a PID regulator 09 with a numerical signal.

[0040] Specifically, the solution pump 17 adopts a redundant configuration or a multiple configuration installation structure.

[0041] Specifically, a regulating valve 13 is installed on the water supply pipeline 11 , and the regulating valve 13 is provided with a bypass pipeline 12 , and the bypass pipeline 12 is also provided with a manual valve.

[0042] Specifically, manual valves are provided before and after the regulating valve 13 .

[0043] Specifically, both ends of the bypass pipeline 12 are connected to the water supply pipeline 11, and the regulating valve 13 is located between the connection points of the bypass pipeline 12 and the water supply pipeline 11.

[0044] Specifically, the system device 15 includes a filter, a heat exchanger and a cooler which are interconnected.

[0045] Specifically, a check valve 20 is connected to the water supply pipe 11 .

[0046] Specifically, the water content online analyzer 07 is installed on the lean solution pipeline between the system equipment 15 and the solution pump 17 .

[0047] Specifically, the water supply pipe 11 is connected to the bottom of the desulfurization regeneration tower 08, which is the liquid storage section at the bottom of the desulfurization regeneration tower 08. This connection position avoids the regeneration area in the upper middle part of the desulfurization regeneration tower 08, thereby avoiding the loss of the replenished water due to regeneration evaporation and the impact on the regeneration quality of the solution.

[0048] When the desulfurization device is actually running, the measured value of the water content online analyzer 07 is subtracted from the solution concentration set value in the subtractor 06 (the water content set value in the solution is converted by the solution concentration set value, and it is used as the minuend and the measured value is used as the subtrahend), and the difference ΔC in the solution concentration is obtained. The measured value of the lean liquid flow meter entering the desulfurization absorption tower 01 and the lean liquid flow entering the flash tower are added in the adder to obtain the total lean liquid circulation volume of the desulfurization device. The lean liquid is multiplied by the correction coefficient K (considering the solution volume in the desulfurization absorption tower 01, the desulfurization regeneration tower 08, the desulfurization flash tank 18 and other equipment) in the multiplier 04, and the output value is the theoretical solution volume of the desulfurization system. The output value is then multiplied by the solution concentration difference ΔC in the multiplier to obtain the theoretical water replenishment volume. The theoretical water replenishment volume is used as the set value of the PID regulator 09. The PID regulator 09 performs PID calculation according to the difference between the set value and the water replenishment flow, and then controls the action of the regulating valve 13, thereby realizing the control of automatic water replenishment.

[0049] Among them, the set value and correction coefficient of the solution concentration can be modified according to actual conditions.

[0050] In addition, when the desulfurization device is not equipped with an online water content analyzer 07, the manual analysis value of the solution concentration can also be used instead.

[0051] The desulfurization device realizes the automatic operation of solution water replenishment, replaces the manual water replenishment operation, reduces the labor intensity of operators, and improves work efficiency. Due to the large amount of system solution, the problems of delayed, untimely and improper operation of water replenishment operation are solved, and accurate water replenishment is realized, so that the adjustment of solution concentration is timely and accurate, which improves the stability of the operation of the desulfurization device and reduces and avoids the waste of resources caused by unqualified product natural gas venting and combustion due to solution concentration. The desulfurization device with automatic water replenishment structure is suitable for existing natural gas desulfurization devices, industrial tail gas desulfurization devices, tail gas treatment devices, and can be widely used in petroleum, chemical, thermal power generation and other industries. It has the advantages of wide application range and good application prospects.

[0052] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A desulfurization device with an automatic water replenishment structure, comprising a desulfurization absorption tower (01), a desulfurization regeneration tower (08) and a desulfurization flash tank (18) interconnected by pipelines, characterized in that: The bottom of the desulfurization regeneration tower (08) is connected to a water supply pipeline (11), and the water supply pipeline (11) is connected to a regulating valve (13); A lean liquid pipeline (02) and a rich liquid output pipeline (14) are connected between the desulfurization regeneration tower (08) and the desulfurization absorption tower (01); a lean liquid pipeline (02) is connected between the desulfurization regeneration tower (08) and the desulfurization flash tank (18); The rich liquid output pipeline (14) is used to transport the liquid in the desulfurization absorption tower (01) to the desulfurization regeneration tower (08). According to the flow direction of the liquid, the rich liquid output pipeline (14) is connected to the desulfurization flash tank (18) and the system equipment (15) in sequence; The lean liquid pipeline (02) is used to transport the liquid discharged from the bottom of the desulfurization regeneration tower (08) to the packing columns of the desulfurization absorption tower (01) and the desulfurization flash tank (18). According to the flow direction of the liquid, the lean liquid pipeline (02) is connected to the system equipment (15) and the solution pump (17) in sequence; the lean liquid pipeline (02) is installed with a first flow meter (03), an online water content analyzer (07), and a third flow meter (16); the first flow meter (03) and the third flow meter (16) are connected to an adder (19) with numerical signals; the online water content analyzer (07) is connected to a subtractor (06) with numerical signals, and the adder (19) and the subtractor (06) are both connected to a multiplier 1 (04) and a multiplier 2 (05) with numerical signals; the water supply pipeline (11) is installed with a second flow meter (10), and the second flow meter (10) is connected to a PID regulator (09) with numerical signals.

2. A desulfurization device with an automatic water replenishment structure according to claim 1, characterized in that: The first flow meter (03), the water content online analyzer (07), the second flow meter (10), the third flow meter (16), and the regulating valve are all connected to the controller via signal lines.

3. The desulfurization device with automatic water replenishment structure according to claim 1 is characterized in that: The adder (19), multiplier 1 (04), multiplier 2 (05), PID regulator (09), and subtractor (06) are all function blocks inside the controller, which are implemented by program configuration in the controller, and the function blocks are connected by numerical signals.

4. A desulfurization device with an automatic water replenishment structure according to claim 2 or 3, characterized in that: The controller includes any one of PLC, RTU, DCS, BPCS and SIS.

5. The desulfurization device with automatic water replenishment structure according to claim 1 is characterized in that: The solution pump (17) is installed in a redundant configuration or in multiple configurations.

6. A desulfurization device with an automatic water replenishment structure according to claim 1, characterized in that: The water supply pipeline (11) is provided with a regulating valve (13), the regulating valve (13) is provided with a bypass pipeline (12), and the bypass pipeline (12) is also provided with a manual valve; Manual valves are arranged before and after the regulating valve (13); Both ends of the bypass pipeline (12) are in communication with the water supply pipeline (11), and the regulating valve (13) is located between the connection point between the bypass pipeline (12) and the water supply pipeline (11).

7. The desulfurization device with automatic water replenishment structure according to claim 1, characterized in that: The system equipment (15) includes a filter, a heat exchanger and a cooler which are interconnected.

8. The desulfurization device with automatic water replenishment structure according to claim 1, characterized in that: The water supply pipeline (11) is connected to a check valve (20).

9. The desulfurization device with automatic water replenishment structure according to claim 1, characterized in that: The water content online analyzer (07) is installed on the lean solution pipeline between the system equipment (15) and the solution pump (17).

10. The desulfurization device with automatic water replenishment structure according to claim 1, characterized in that: The water supply pipeline (11) is connected to the bottom position of the desulfurization regeneration tower (08), and the bottom position of the desulfurization regeneration tower (08) is the liquid storage section at the bottom of the desulfurization regeneration tower (08).

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