Device for removing hydrogen sulfide from natural gas

Abstract

The utility model discloses a device for removing hydrogen sulfide in natural gas, which reliably removes hydrogen sulfide gas in the natural gas, is low in operation energy consumption and reduces treatment cost. The device comprises a gas filter. At least one group of hydrogen sulfide removal membrane contactors; each group of volatile organic compound removal membrane contactors comprises a contactor body, a natural gas inlet, a natural gas outlet, an absorbent inlet and an absorbent outlet, all adjacent hydrogen sulfide removal membrane contactors are independently arranged in parallel and form a natural gas inlet header pipe and a natural gas outlet header pipe, a branch of the natural gas inlet header pipe is connected with the corresponding natural gas inlet, and a branch of the natural gas outlet header pipe is connected with the absorbent outlet. Each group of hydrogen sulfide removal membrane contactors are respectively connected in parallel with the natural gas outflow header pipe; the absorbent storage tank comprises an upper-layer cavity and a lower-layer cavity which are separated, an absorbent which does not adsorb hydrogen sulfide is placed in the upper-layer cavity of the absorbent storage tank, and an absorbent which adsorbs hydrogen sulfide is temporarily placed in the lower-layer cavity of the absorbent storage tank; and an absorbent regeneration column.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of natural gas treatment, specifically is a device for removing hydrogen sulfide from natural gas. BACKGROUND

[0002] Natural gas contains hydrogen sulfide during formation, and hydrogen sulfide needs to be removed. The existing methods for removing hydrogen sulfide from natural gas include physical adsorption or chemical adsorption. The existing chemical adsorption method usually removes hydrogen sulfide in natural gas by washing gas tower. However, the operation energy consumption of the washing gas tower for removing hydrogen sulfide in natural gas is high, which leads to high processing cost. SUMMARY

[0003] To solve the above problems, the utility model provides a device for removing hydrogen sulfide from natural gas, which can reliably remove hydrogen sulfide gas in natural gas after removal, has low operation energy consumption, and reduces processing cost.

[0004] A device for removing hydrogen sulfide from natural gas, characterized in that it comprises:

[0005] a gas filter;

[0006] at least one group of desulfurization membrane contactors; each group of desulfurization membrane contactors comprises a contactor body, a natural gas inlet, a natural gas outlet, an absorbent inlet, and an absorbent outlet. All adjacent desulfurization membrane contactors are independently connected in parallel and form a natural gas inlet main pipe and a natural gas outlet main pipe. Branches of the natural gas inlet main pipe are connected to corresponding natural gas inlets. Each group of desulfurization membrane contactors is connected in parallel to the natural gas outlet main pipe.

[0007] an absorbent storage tank, which comprises a separated upper cavity and a lower cavity. The upper cavity of the absorbent storage tank contains absorbent that has not adsorbed hydrogen sulfide. The lower cavity of the absorbent storage tank temporarily contains absorbent that has adsorbed hydrogen sulfide.

[0008] and an absorbent regeneration tower.

[0009] Natural gas is introduced into the natural gas inlet of the gas filter, the natural gas outlet of the gas filter is connected to the natural gas inlet of each group of hydrogen sulfide removal membrane contactors through corresponding gas inlet pipelines respectively, the natural gas removed of hydrogen sulfide is collected into a natural gas output header through the natural gas outlet of each group of hydrogen sulfide removal membrane contactors, the upper cavity of the absorbent storage tank is connected to the absorbent inlet of each group of the hydrogen sulfide removal membrane contactors through an absorbent output pipeline in parallel, the absorbent outlets of each group of hydrogen sulfide removal membrane contactors are connected to a collecting pipeline through branch pipelines, an absorbent circulating pump is integrated on the collecting pipeline, the output end of the collecting pipeline is connected to the input end of the lower cavity of the absorbent storage tank, the output end of the lower cavity of the absorbent storage tank is directly or indirectly connected to the bottom input port of the absorbent regeneration tower, the top of the absorbent regeneration tower is provided with a pure hydrogen sulfide gas outlet, and the upper absorbent outlet of the absorbent regeneration tower is connected to the material inlet of the upper cavity of the absorbent storage tank.

[0010] It is further characterized in that:

[0011] The output end of the lower cavity of the absorbent storage tank is indirectly connected to the bottom input port of the absorbent regeneration tower, the output end of the lower cavity of the absorbent storage tank is connected to the input end of the to-be-regenerated agent storage tank through an absorbent transfer pump, and the output end of the to-be-regenerated agent storage tank is connected to the bottom input port of the absorbent regeneration tower through a regenerated agent feeding pump.

[0012] The two groups of hydrogen sulfide removal membrane contactors are fixed on a mounting frame in parallel, and the two groups of hydrogen sulfide removal membrane contactors are respectively a first hydrogen sulfide removal membrane contactor and a second hydrogen sulfide removal membrane contactor.

[0013] The absorbent in the absorbent storage tank is an alcohol amine solution.

[0014] The absorbent is circulated and delivered by the absorbent circulating pump and pressurized to 0.6 MPa.

[0015] After the utility model is adopted, the working principle of the hydrogen sulfide removal membrane contactor is seen Figure 2 The gas transmission membrane material adopted is a material selectively permeable to substances, a large number of hollow fibers are arranged in the devolatilization organic matter membrane contactor, the wall of the fiber has tiny holes, only gas molecules can pass through the micropores, the gas can pass through the material in two directions, and the liquid cannot pass through, the gas-liquid contact is established on the surfaces of the material on both sides, the hydrogen sulfide gas in the natural gas is collected into the adsorption liquid through the liquid flow, so that the hydrogen sulfide gas is adsorbed, when the whole device operates, the natural gas enters through the natural gas inlet, is filtered through the gas filter, and the impurities in the natural gas are removed, so that the solid content in the natural gas is less than 0.1 mg / m 3Then, the absorbent is pumped out by the absorbent circulating pump, enters into the desulfurization hydrogen membrane contactor, and reacts with hydrogen sulfide in the membrane contactor to absorb hydrogen sulfide in the natural gas, the natural gas from which the hydrogen sulfide is removed is discharged through the natural gas outlet, and the absorbent saturated with hydrogen sulfide is sent into the absorbent regenerator, the absorbent is regenerated in the regenerator, the regenerated absorbent returns to the absorbent storage tank, and the generated pure hydrogen sulfide gas is discharged through the pure hydrogen sulfide gas outlet and then enters into the next process for reuse, the device contains an automatic control cabinet, and the whole device can automatically run; the device can reliably remove hydrogen sulfide in the natural gas, has low operation energy consumption, and reduces the processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the device;

[0017] Figure 2 It is a structural schematic diagram of the desulfurization hydrogen membrane contactor adopted by the device;

[0018] The names corresponding to the serial numbers in the drawing are as follows:

[0019] Contactor body 1, natural gas inlet 2, natural gas outlet 3, absorbent inlet 4, absorbent outlet 5;

[0020] Gas filter 10, absorbent storage tank 20, upper cavity 21, lower cavity 22, absorbent output pipe 23, collection pipeline 24, regenerated absorbent storage tank 30, absorbent regenerator 40, bottom input port 41, pure hydrogen sulfide gas outlet 42, absorbent outlet 43, first desulfurization hydrogen membrane contactor 50, mounting frame 51, natural gas inlet main pipe 52, natural gas outlet main pipe 53, second desulfurization hydrogen membrane contactor 60, absorbent circulating pump 70, absorbent transfer pump 80, regenerated absorbent feeding pump 90. DETAILED DESCRIPTION

[0021] A device for removing hydrogen sulfide from natural gas, as shown in Figure 1 and Figure 2 The device comprises a gas filter 10, two groups of desulfurization hydrogen membrane contactors, an absorbent storage tank 20, a regenerated absorbent storage tank 30, and an absorbent regenerator 40.

[0022] Each group of devolatilization organic matter membrane contactors comprises a contactor body 1, a natural gas inlet 2, a natural gas outlet 3, an absorbent inlet 4, and an absorbent outlet 5, two groups of desulfurization hydrogen membrane contactors are fixed on a mounting frame 51 in parallel, and the two groups of desulfurization hydrogen membrane contactors are respectively a first desulfurization hydrogen membrane contactor 50 and a second desulfurization hydrogen membrane contactor 60.

[0023] The first hydrogen sulfide removal membrane contactor 50 and the second hydrogen sulfide removal membrane contactor 60 are independently and parallelly arranged, and are formed with a natural gas inlet main pipe 52 and a natural gas outlet main pipe 53, the natural gas inlet main pipe 52 is branched to be connected to the corresponding natural gas inlets 2, and the natural gas outlets 3 of each group of hydrogen sulfide removal membrane contactors are parallelly connected to the natural gas outlet main pipe 53.

[0024] The absorbent storage tank 20 comprises a separated upper cavity 21 and a lower cavity 22, the upper cavity 21 of the absorbent storage tank 20 is used to place the absorbent without adsorbing hydrogen sulfide, and the lower cavity 22 of the absorbent storage tank 20 is used to temporarily place the absorbent with adsorbing hydrogen sulfide.

[0025] The natural gas is input into the natural gas inlets of the gas filter 10, the natural gas outlets of the gas filter 10 are connected to the natural gas inlet main pipe 52 through the corresponding gas inlet pipelines, the natural gas without hydrogen sulfide is collected into the natural gas outlet main pipe 53 through the natural gas outlets 3 of each group of hydrogen sulfide removal membrane contactors, the upper cavity 21 of the absorbent storage tank 20 is parallelly connected to the absorbent inlets 4 of each group of hydrogen sulfide removal membrane contactors through the absorbent outlet pipeline 23, the absorbent outlets 5 of each group of hydrogen sulfide removal membrane contactors are connected to the collecting pipeline 24 through the branch pipelines, the collecting pipeline 24 is integrated with the absorbent circulating pump 70, the output end of the collecting pipeline 24 is connected to the input end of the lower cavity 22 of the absorbent storage tank 20, the output end of the lower cavity 22 of the absorbent storage tank 20 is indirectly connected to the bottom input port of the absorbent regeneration tower, the output end of the lower cavity 22 of the absorbent storage tank 20 is connected to the input end of the regenerated absorbent storage tank 30 through the absorbent transfer pump 80, the output end of the regenerated absorbent storage tank 30 is connected to the bottom input port 41 of the absorbent regeneration tower 40 through the regenerated absorbent feeding pump 90, the top of the absorbent regeneration tower 40 is provided with a pure hydrogen sulfide gas outlet 42, and the upper absorbent outlet 43 of the absorbent regeneration tower 40 is connected to the input port of the upper cavity 21 of the absorbent storage tank 20.

[0026] In a specific implementation, the absorbent in the absorbent storage tank 20 is an alcohol amine solution.

[0027] The absorbent is circulated and delivered by the absorbent circulating pump 70 and pressurized to 0.6 MPa before working.

[0028] During the operation of the whole device, the natural gas is input through the natural gas inlets, filtered through the gas filter, and impurities in the natural gas are removed, so that the solid content in the natural gas is less than 0.1 mg / m 3Then, the absorbent is pumped out by the absorbent circulating pump and enters into the hydrogen sulfide removal membrane contactor, the absorbent and hydrogen sulfide in the membrane contactor react, and the hydrogen sulfide in the natural gas is absorbed, the natural gas from which the hydrogen sulfide is removed is discharged through the natural gas outlet, and the absorbent saturated with hydrogen sulfide is sent into the absorbent regeneration tower, the absorbent is regenerated in the regeneration tower, the regenerated absorbent returns to the lower cavity of the absorbent storage tank, the absorbent saturated with hydrogen sulfide is transported to the regenerated absorbent storage tank by the absorbent transfer pump, the regenerated absorbent is transported into the absorbent regeneration tower by the regenerated absorbent feeding pump, the absorbent is regenerated in the regeneration tower, the regenerated absorbent returns to the upper cavity of the absorbent storage tank, and the regenerated pure hydrogen sulfide gas is discharged through the pure hydrogen sulfide gas outlet and then enters into the next process for reuse, the device contains an automatic control cabinet, and the whole device can automatically operate.

[0029] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the elements of the claims. Any reference signs in the claims should not be considered as limiting the claims to which they relate.

[0030] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. An apparatus for removing hydrogen sulfide from natural gas, characterized by It includes: Gas filter; At least one set of hydrogen sulfide removal membrane contactors; each set of volatile organic compound removal membrane contactors includes a contactor body, a natural gas inlet, a natural gas outlet, an absorbent inlet, and an absorbent outlet. All adjacent hydrogen sulfide removal membrane contactors are independently connected in parallel and form a natural gas inlet main pipe and a natural gas outlet main pipe. A branch of the natural gas inlet main pipe is connected to the corresponding natural gas inlet. Each set of hydrogen sulfide removal membrane contactors is connected in parallel to the natural gas outlet main pipe. An absorbent storage tank includes a separate upper cavity and a lower cavity. The upper cavity of the absorbent storage tank contains absorbent that has not adsorbed hydrogen sulfide, and the lower cavity of the absorbent storage tank temporarily contains absorbent that has adsorbed hydrogen sulfide. And the absorbent regeneration tower; Natural gas is introduced into the natural gas inlet of the gas filter. The natural gas outlet of the gas filter is connected to the natural gas inlet of each set of hydrogen sulfide removal membrane contactors through corresponding inlet pipes. The natural gas with hydrogen sulfide removed flows into the natural gas output main pipe through the natural gas outlet of each set of hydrogen sulfide removal membrane contactors. The upper cavity of the absorbent storage tank is connected in parallel to the absorbent inlet of each set of hydrogen sulfide removal membrane contactors through an absorbent output pipe. The absorbent outlet of each set of hydrogen sulfide removal membrane contactors is connected to the main pipeline through a branch pipe. An absorbent circulation pump is integrated on the main pipeline. The output end of the main pipeline is connected to the input end of the lower cavity of the absorbent storage tank. The output end of the lower cavity of the absorbent storage tank is directly or indirectly connected to the bottom input port of the absorbent regeneration tower. A pure hydrogen sulfide gas outlet is provided at the top of the absorbent regeneration tower. The upper absorbent outlet of the absorbent regeneration tower is connected to the feed inlet of the upper cavity of the absorbent storage tank.

2. The apparatus for removing hydrogen sulfide from natural gas according to claim 1, wherein: The output end of the lower cavity of the absorbent storage tank is indirectly connected to the bottom inlet of the absorbent regeneration tower. The output end of the lower cavity of the absorbent storage tank is connected to the inlet of the regenerable storage tank through an absorbent transfer pump. The output end of the regenerable storage tank is connected to the bottom inlet of the absorbent regeneration tower through a regenerable feed pump.

3. The apparatus for removing hydrogen sulfide from natural gas according to claim 1, wherein: Two sets of hydrogen sulfide removal membrane contactors are fixed in parallel on a mounting frame. The two sets of hydrogen sulfide removal membrane contactors are the first hydrogen sulfide removal membrane contactor and the second hydrogen sulfide removal membrane contactor.

4. The apparatus for removing hydrogen sulfide from natural gas according to claim 1, wherein: The absorbent in the absorbent storage tank is an alcohol amine solution.

5. The apparatus for removing hydrogen sulfide from natural gas according to claim 1, wherein: The absorbent is circulated and pressurized to 0.6 MPa by an absorbent circulation pump.

Images