Compound bed type natural gas desulfurization device

Abstract

The utility model discloses a compound bed type natural gas desulfurization device which comprises a first desulfurization tower and a second desulfurization tower, a first input pipe with a first input control valve and a first output pipe with a first output control valve are connected to the first desulfurization tower, and a second input pipe with a second output control valve is connected to the second desulfurization tower. The second desulfurization tower is connected with a second input pipe with a second input control valve and a second output pipe with a second output control valve, the first input pipe and the second input pipe are connected to an input header pipe, and the first output pipe and the second output pipe are connected to an output header pipe; a series pipeline mechanism is arranged between the first output pipe and the second input pipe; a desulfurization filler bed layer is arranged in each desulfurization tower, and the desulfurization filler bed layer in each desulfurization tower comprises a first desulfurization bed layer for removing inorganic sulfur and a second desulfurization bed layer for removing organic sulfur. The desulfurization device has the advantages that the desulfurization device has multiple desulfurization modes, can be selectively used according to actual requirements, is good in desulfurization effect, can effectively avoid environmental pollution, and can effectively reduce desulfurization cost.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas desulfurization equipment. Background Art

[0002] At present, the natural gas desulfurization process mainly uses amine liquid for absorption-regeneration process. This process is mature and suitable for working conditions with high sulfur content and relatively single sulfur components. When the sulfur content in natural gas is low and the sulfur components contain both inorganic sulfur and organic sulfur, that is, the sulfur components are relatively complex, a single amine liquid component cannot effectively remove the organic sulfur components.

[0003] In order to meet the production needs of natural gas with different components in natural gas plants, especially for natural gas with relatively low sulfur content and containing both inorganic sulfur such as H2S and organic sulfur such as mercaptans, the applicant has developed a composite bed type natural gas desulfurization device. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a composite bed type natural gas desulfurization device, which has a simple structure, can remove organic sulfur and inorganic sulfur in natural gas, and has multiple desulfurization modes to choose from.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is: a composite bed type natural gas desulfurization device, comprising: a first desulfurization tower and a second desulfurization tower, the first desulfurization tower is connected to a first input pipe with a first input control valve and a first output pipe with a first output control valve, the second desulfurization tower is connected to a second input pipe with a second input control valve and a second output pipe with a second output control valve, the first input pipe and the second input pipe are both connected to the input main pipe, and the first output pipe and the second output pipe are both connected to the output main pipe; a series pipeline mechanism is arranged between the first output pipe and the second input pipe, which enables the first desulfurization tower and the second desulfurization tower to be connected in series, the input end of the series pipeline mechanism is connected to the first output pipe between the output port of the first desulfurization tower and the first output control valve, and the output end of the series pipeline mechanism is connected to the second input pipe between the second input control valve and the input port of the second desulfurization tower; a desulfurization packed bed is arranged in each desulfurization tower, and the desulfurization packed bed in each desulfurization tower includes a first desulfurization bed for removing inorganic sulfur and a second desulfurization bed for removing organic sulfur.

[0006] Furthermore, in the aforementioned composite bed type natural gas desulfurization device, the structure of the series piping mechanism includes: a boosting pipe and a connecting pipe arranged in parallel, a boosting pump is arranged on the boosting pipe, a boosting input control valve and a boosting output control valve are arranged on the boosting pipes at both ends of the boosting pump, a connecting control valve is arranged on the connecting pipe, the input ends of the boosting pipe and the connecting pipe are both connected to the series input connecting pipe, the output ends of the boosting pipe and the connecting pipe are both connected to the series output connecting pipe, the series input connecting pipe is connected to the first output pipe between the output port of the first desulfurization tower and the first output control valve, and the series output connecting pipe is connected to the second input pipe between the second input control valve and the input port of the second desulfurization tower.

[0007] Furthermore, in the aforementioned composite bed type natural gas desulfurization device, an online component analysis device is provided at the output end of the output main pipe.

[0008] Furthermore, in the aforementioned composite bed type natural gas desulfurization device, a series input pressure detection device is provided on the series input pipe, and a boost output pressure detection device is provided at the output end of the boost pipe.

[0009] Furthermore, in the aforementioned composite bed type natural gas desulfurization device, the first desulfurization bed for removing inorganic sulfur is an iron oxide desulfurization bed with γ-FeOOH as a desulfurizer, and the second desulfurization bed for removing organic sulfur is an adsorbent desulfurization bed with copper-loaded activated carbon as a desulfurizer; the height of the first desulfurization bed and the height of the second desulfurization bed are respectively greater than or equal to 100 cm.

[0010] Furthermore, in the aforementioned composite bed type natural gas desulfurization device, the first desulfurization bed and the second desulfurization bed are arranged in sequence from bottom to top, a first porcelain ball layer is arranged at the bottom of the first desulfurization bed, and the first porcelain ball layer is laid on the bottom grid in the desulfurization tower; the first desulfurization bed and the second desulfurization bed are separated by the second porcelain ball layer; and a stainless steel wire mesh is arranged on the top of the second desulfurization bed.

[0011] Furthermore, in the aforementioned composite bed type natural gas desulfurization device, the thickness of the first porcelain ball layer is greater than or equal to 10 cm, and the thickness of the second porcelain ball layer is greater than or equal to 5 cm and less than 10 cm.

[0012] Furthermore, in the aforementioned composite bed type natural gas desulfurization device, a temperature regulator and a first temperature detection device are provided at the inlet end position on the input main pipe.

[0013] Furthermore, in the aforementioned composite bed type natural gas desulfurization device, a second temperature detection device is provided on the output main pipe.

[0014] Furthermore, in the aforementioned composite bed type natural gas desulfurization device, a first sewage pipe with a first sewage control valve is provided at the bottom of the first desulfurization tower, and a second sewage pipe with a second sewage control valve is provided at the bottom of the second desulfurization tower, and both the first sewage pipe and the second sewage pipe are connected to the sewage main pipe.

[0015] The advantages of the utility model are: 1. The structure is simple, and it provides a reliable desulfurization device for removing organic sulfur and inorganic sulfur from natural gas, realizing one-step desulfurization. 2. The desulfurization device has multiple desulfurization modes, which can be selected and used according to actual needs. It not only has a good desulfurization effect, can effectively avoid environmental pollution, but also can effectively reduce the desulfurization cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the principle structure of a composite bed type natural gas desulfurization device described in the utility model. DETAILED DESCRIPTION

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0018] like Figure 1 As shown, a composite bed type natural gas desulfurization device comprises: a first desulfurization tower 1 and a second desulfurization tower 2, wherein the first desulfurization tower 1 is connected with a first input pipe 11 with a first input control valve 101 and a first output pipe 12 with a first output control valve 102. The first input pipe 11 is connected to the lower end of the first desulfurization tower 1, and the first output pipe 12 is connected to the top of the first desulfurization tower 1. The second desulfurization tower 2 is connected with a second input pipe 21 with a second input control valve 201 and a second output pipe 22 with a second output control valve 202. The second input pipe 21 is connected to the lower end of the second desulfurization tower 2, and the second output pipe 22 is connected to the top of the second desulfurization tower 2. The first input pipe 11 and the second input pipe 21 are both connected to the input main pipe 3, and the first output pipe 12 and the second output pipe 22 are both connected to the output main pipe 4. A first sewage pipe 13 with a first sewage control valve 131 is provided at the bottom of the first desulfurization tower 1, and a second sewage pipe 23 with a second sewage control valve 231 is provided at the bottom of the second desulfurization tower 2. Both the first sewage pipe 13 and the second sewage pipe 23 are connected to the sewage main pipe 6. The first sewage pipe 13 is used to discharge sewage from the first desulfurization tower 1, and the second sewage pipe 23 is used to discharge sewage from the second desulfurization tower 2. The discharged liquid is gathered in the sewage main pipe 6 and discharged outward.

[0019] The first desulfurization tower 1 and the second desulfurization tower 2 of the above structure are arranged in parallel between the input main pipe 3 and the output main pipe 4. When one of the desulfurization towers is working, the other desulfurization tower can be used as a standby, thereby achieving non-stop desulfurization work.

[0020] A series piping mechanism 5 is provided between the first output pipe 12 and the second input pipe 21, which enables the first desulfurization tower 1 and the second desulfurization tower 2 to be connected in series. The input end of the series piping mechanism 5 is connected to the first output pipe 12 between the output port of the first desulfurization tower 1 and the first output control valve 102; the output end of the series piping mechanism 5 is connected to the second input pipe 21 between the second input control valve 201 and the input port of the second desulfurization tower 2.

[0021] The structure of the series pipeline mechanism 5 includes: a boosting pipe 51 and a connecting pipe 52 arranged in parallel, a boosting pump 511 is arranged on the boosting pipe 51, a boosting input control valve 512 is arranged on the boosting pipe 51 on the input end side of the boosting pump 511, and a connecting control valve 521 is arranged on the connecting pipe 52. The input ends of the boosting pipe 51 and the connecting pipe 52 are both connected to the series input pipe 53, and the output ends of the boosting pipe 51 and the connecting pipe 52 are both connected to the series output pipe 54. The series input pipe 53 is connected to the first output pipe 12 between the output port of the first desulfurization tower 1 and the first output control valve 102. The series output pipe 54 is connected to the second input pipe 21 between the second input control valve 201 and the input port of the second desulfurization tower 2. A series input pressure detection device 531 is arranged on the series input pipe 53, and a boosting output pressure detection device 513 is arranged on the output end of the boosting pipe 51. The series input pressure detection device 531 and the boosting output pressure detection device 513 are used to detect pipeline pressure.

[0022] The purpose of setting up the series piping mechanism 5 is to realize double-tower desulfurization by connecting the first desulfurization tower 1 and the second desulfurization tower 2 in series, thereby providing more selection modes for desulfurization.

[0023] A temperature regulator 31 and a first temperature detection device 32 are provided at the inlet position of the input main pipe 3. An online component analysis device 41 is provided at the output end of the output main pipe 4, and a second temperature detection device 42 is provided on the output main pipe 4. The online component analysis device 41 is used to detect the composition of the natural gas output by the output main pipe 4, so as to determine whether the sulfur content in the output natural gas meets the requirements. When the sulfur content in the natural gas detected by the online component analysis device 41 is greater than the sulfur content setting value, it means that the sulfur content in the natural gas does not meet the requirements. When the sulfur content in the natural gas detected by the online component analysis device 41 is less than or equal to the sulfur content setting value, it means that the sulfur content in the natural gas meets the requirements. The temperature regulator 31 adopts a water bath heat exchanger. The function of setting the temperature regulator 31 is to control the temperature of the natural gas to be desulfurized at 10°C to 40°C in order to improve the desulfurization efficiency.

[0024] A desulfurization packed bed is arranged in each desulfurization tower, and the desulfurization packed bed in each desulfurization tower includes a first desulfurization bed 10 for removing inorganic sulfur and a second desulfurization bed 20 for removing organic sulfur. The first desulfurization bed 10 for removing inorganic sulfur is an iron oxide desulfurization bed with γ-FeOOH as a desulfurizer, and the second desulfurization bed 20 for removing organic sulfur is an adsorbent desulfurization bed with copper-loaded activated carbon as a desulfurizer; the height of the first desulfurization bed 10 and the height of the second desulfurization bed 20 are respectively greater than or equal to 100 cm.

[0025] The first desulfurization bed layer 10 and the second desulfurization bed layer 20 are arranged in sequence from bottom to top. A first porcelain ball layer 30 is arranged at the bottom of the first desulfurization bed layer 10, and the first porcelain ball layer 30 is laid on the bottom grid 40 in the desulfurization tower. The first desulfurization bed layer 10 and the second desulfurization bed layer 20 are separated by a second porcelain ball layer 50. A stainless steel wire mesh 60 is arranged on the top of the second desulfurization bed layer 20. The thickness of the first porcelain ball layer 30 is greater than or equal to 10 cm, and the thickness of the second porcelain ball layer 50 is greater than or equal to 5 cm and less than 10 cm.

[0026] γ-FeOOH can be used to effectively remove hydrogen sulfide components in natural gas. The principle is as follows: Under anaerobic conditions, the following reaction usually occurs: Fe(OH)3 + 3H2S → Fe2S3 + 3H2O. The treatment of mercaptans with a foul odor and an extremely low olfactory threshold has always been an industrial difficulty. The mercaptan content carried in most natural gas in my country is not high. Conventional odor control schemes such as thermal storage oxidation and absorption oxidation methods have little effect on natural gas with a content below 10ppm, and will produce a large amount of wastewater. It is not applicable to gas fields with low mercaptan content in areas with relatively scarce water resources. Since copper atoms and the thiol groups of the thiol structure have strong coordination properties, copper-loaded activated carbon is used as a long-term mercaptan adsorbent in this application to effectively remove organic sulfur. γ-FeOOH is used as a desulfurizer for removing inorganic sulfur, and copper-loaded activated carbon is used as a desulfurizer for removing organic sulfur. The two are compounded to form a compound bed type natural gas desulfurization tower, which can achieve effective removal of organic sulfur and inorganic sulfur.

[0027] In this embodiment, the first desulfurization bed 10 and the second desulfurization bed 20 are separated by the second ceramic ball layer 50. The advantage is that under anaerobic conditions, the reaction between the iron-based desulfurizer and hydrogen sulfide will produce a certain amount of water molecules, and the second ceramic ball layer 50 can effectively prevent the two fillers from contacting and corroding each other in a humid environment, resulting in the loss of adsorption sites. The second ceramic ball layer 50 has a better effect when the thickness is greater than or equal to 5 cm.

[0028] The following introduces the working process of the single-tower desulfurization mode and the double-tower desulfurization mode to further introduce the composite bed type natural gas desulfurization device described in the present application.

[0029] Single-tower desulfurization mode: the boost input control valve 512 and the connection control valve 521 are in the closed state.

[0030] The first desulfurization tower 1 and the second desulfurization tower 2, one of them is performing desulfurization work, and the other is in standby state. The following description will be made by taking the first desulfurization tower 1 in operation and the second desulfurization tower 2 in standby state as an example.

[0031] The first input control valve 101 and the first output control valve 102 are open, and the second input control valve 201 and the second output control valve 202 are closed. The natural gas to be desulfurized is input into the main pipe 3 and the temperature is adjusted by the temperature regulator 31, and the temperature is controlled at 10°C to 40°C. Then, it enters the first desulfurization tower 1 through the first input pipe 11. The natural gas to be desulfurized moves from bottom to top, and passes through the first desulfurization bed 10 and the second desulfurization bed 20 in sequence, thereby removing inorganic sulfur and organic sulfur from the natural gas. The desulfurized natural gas is first output through the first output pipe 12 and then through the output main pipe 4.

[0032] When the sulfur content of the output natural gas detected by the online analysis device 41 on the output main pipe 4 is greater than the set value of the sulfur content, it means that the sulfur content of the natural gas after desulfurization by the first desulfurization tower 1 is unqualified, then the first desulfurization tower 1 stops the desulfurization work, and the filler is replaced to wait for the next desulfurization work, and the second desulfurization tower 2 starts the desulfurization work. At this time, the first input control valve 101 and the first output control valve 102 are closed, and the second input control valve 201 and the second output control valve 202 are opened. The natural gas that needs to be desulfurized is temperature-regulated by the temperature regulator 31 through the input main pipe 3, and the temperature is controlled at 10℃~40℃, and then enters the second desulfurization tower 2 through the second input pipe 21 for desulfurization. The natural gas after desulfurization is first output through the second output pipe 2 and then through the output main pipe 4.

[0033] The above is a single-tower working mode. In the single-tower working mode, the first desulfurization tower 1 and the second desulfurization tower 2 work alternately.

[0034] When the sulfur content of the output natural gas detected by the online analysis device 41 on the output main pipe 4 is greater than the set value of the sulfur content, the dual-tower working mode can also be selected. When the dual-tower working mode is selected, the first output control valve 102 is closed and the second input control valve 201 is also in a closed state. If the gas pressure detected by the series input pressure detection device 531 is large enough and does not require pressurization, the pressurization input control valve 512 is in a closed state and the connection control valve 521 is in an open state. At this time, the natural gas discharged from the first desulfurization tower 1 enters the second desulfurization tower 2 through the first output pipe 12, the series input pipe 53, the connecting pipe 52, and the second input pipe 21 for desulfurization. If the gas pressure detected by the series input pressure detection device 531 is low and the gas needs to be pressurized, the pressurization input control valve 512 is in an open state and the connection control valve 521 is in a closed state. At this time, the natural gas discharged from the first desulfurization tower 1 enters the second desulfurization tower 2 through the first output pipe 12, the series input pipe 53, the pressurization pipe 51, the pressurization pump 511, and the second input pipe 21 for desulfurization. The setting of the boost pipe 51 and the connecting pipe 52 provides options for different desulfurization pressure conditions. When the pressure is sufficient, there is no need for boosting, thereby effectively reducing the desulfurization energy consumption. The natural gas desulfurized in the second desulfurization tower 2 is output through the second output pipe 2 and then through the output main pipe 4. The double-tower working mode has the advantages of: it can maximize the use of the desulfurizer in the first desulfurization tower 1, and at the same time can effectively reduce the operating load of the second desulfurization tower 2, so it can extend the replacement time of the filler, that is, the desulfurizer, thereby greatly reducing the desulfurization cost.

[0035] The advantages of the utility model are: 1. The structure is simple, and it provides a reliable desulfurization device for removing organic sulfur and inorganic sulfur from natural gas, realizing one-step desulfurization. 2. The desulfurization device has multiple desulfurization modes, which can be selected and used according to actual needs. It not only has a good desulfurization effect, can effectively avoid environmental pollution, but also can effectively reduce the desulfurization cost.

Claims

1. A composite bed type natural gas desulfurization device, comprising: The first desulfurization tower and the second desulfurization tower, the first desulfurization tower is connected with a first input pipe with a first input control valve and a first output pipe with a first output control valve, the second desulfurization tower is connected with a second input pipe with a second input control valve and a second output pipe with a second output control valve, characterized in that: the first input pipe and the second input pipe are both connected to the input main pipe, and the first output pipe and the second output pipe are both connected to the output main pipe; a series piping mechanism is arranged between the first output pipe and the second input pipe so as to connect the first desulfurization tower and the second desulfurization tower in series, the input end of the series piping mechanism is connected to the first output pipe between the output port of the first desulfurization tower and the first output control valve, and the output end of the series piping mechanism is connected to the second input pipe between the second input control valve and the input port of the second desulfurization tower; a desulfurization packed bed is arranged in each desulfurization tower, and the desulfurization packed bed in each desulfurization tower includes a first desulfurization bed for removing inorganic sulfur and a second desulfurization bed for removing organic sulfur.

2. A composite bed type natural gas desulfurization device according to claim 1, characterized in that: The structure of the series piping mechanism includes: a boosting pipe and a connecting pipe arranged in parallel, a boosting pump is arranged on the boosting pipe, a boosting input control valve and a boosting output control valve are arranged on the boosting pipes at both ends of the boosting pump, a connecting control valve is arranged on the connecting pipe, the input ends of the boosting pipe and the connecting pipe are both connected to the series input connecting pipe, the output ends of the boosting pipe and the connecting pipe are both connected to the series output connecting pipe, the series input connecting pipe is connected to the first output pipe between the output port of the first desulfurization tower and the first output control valve, and the series output connecting pipe is connected to the second input pipe between the second input control valve and the input port of the second desulfurization tower.

3. A composite bed type natural gas desulfurization device according to claim 2, characterized in that: An online component analysis device is provided at the output end of the output main pipe.

4. A composite bed type natural gas desulfurization device according to claim 2, characterized in that: A series input pressure detection device is arranged on the series input pipe, and a boost output pressure detection device is arranged on the output end of the boost pipe.

5. A composite bed type natural gas desulfurization device according to any one of claims 1 to 4, characterized in that: The first desulfurization bed for removing inorganic sulfur is an iron oxide desulfurization bed with γ-FeOOH as a desulfurizer, and the second desulfurization bed for removing organic sulfur is an adsorbent desulfurization bed with copper-loaded activated carbon as a desulfurizer; the height of the first desulfurization bed and the height of the second desulfurization bed are respectively greater than or equal to 100 cm.

6. A composite bed type natural gas desulfurization device according to claim 5, characterized in that: The first desulfurization bed layer and the second desulfurization bed layer are arranged in sequence from bottom to top. A first porcelain ball layer is arranged at the bottom of the first desulfurization bed layer, and the first porcelain ball layer is laid on the bottom grid in the desulfurization tower; the first desulfurization bed layer and the second desulfurization bed layer are separated by the second porcelain ball layer; a stainless steel wire mesh is arranged on the top of the second desulfurization bed layer.

7. A composite bed type natural gas desulfurization device according to claim 6, characterized in that: The thickness of the first porcelain ball layer is greater than or equal to 10 cm, and the thickness of the second porcelain ball layer is greater than or equal to 5 cm and less than 10 cm.

8. A composite bed type natural gas desulfurization device according to any one of claims 1 to 4, characterized in that: A temperature regulator and a first temperature detection device are arranged at the inlet end of the input main pipe.

9. A composite bed type natural gas desulfurization device according to any one of claims 1 to 4, characterized in that: A second temperature detection device is provided on the output main pipe.

10. A composite bed type natural gas desulfurization device according to any one of claims 1 to 4, characterized in that: A first sewage pipe with a first sewage control valve is arranged at the bottom of the first desulfurization tower, and a second sewage pipe with a second sewage control valve is arranged at the bottom of the second desulfurization tower. Both the first sewage pipe and the second sewage pipe are connected to the sewage main pipe.

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