System for preparing high-purity hydrogen from formamide tail gas

Abstract

The utility model belongs to the technical field of chemical equipment, and provides a system for preparing high-purity hydrogen from formamide tail gas, which comprises a pretreatment unit, a liquid separation unit, a hydrogen purification unit, a hydrogen purification unit, a hydrogen purification unit, a hydrogen purification unit and a hydrogen purification unit, and is characterized in that the pretreatment unit comprises a liquid separation tank communicated with a tail gas discharge pipe of a formamide device; the temperature swing adsorption purification unit comprises an adsorption tower, and a gas inlet of the adsorption tower is communicated with a gas outlet of the liquid separation tank. The system for preparing the high-purity hydrogen from the formamide tail gas, provided by the utility model, is simple in structure and reasonable in design, and can be used for preparing the high-purity hydrogen from the formamide tail gas, so that resources are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a system for preparing high-purity hydrogen from formamide tail gas. Background Art

[0002] In the process of producing formamide by dehydrogenation reaction, the tail gas usually includes hydrogen, carbon monoxide, carbon dioxide, organic components, ammonia and methane, among which the hydrogen content is as high as more than 90%. If it is directly discharged, it will not only pollute the environment, but also cause a waste of resources. Utility Model Content

[0003] In view of the defects in the prior art, the purpose of the utility model is to provide a system for producing high-purity hydrogen from formamide tail gas, so as to solve or alleviate the above-mentioned technical problems existing in the prior art.

[0004] In order to achieve the above object, the utility model provides a system for producing high-purity hydrogen from formamide tail gas, comprising:

[0005] A pretreatment unit, comprising a liquid separator, the liquid separator being connected to a tail gas discharge pipe of the formamide device; and

[0006] The temperature-swing adsorption purification unit comprises an adsorption tower, wherein the air inlet of the adsorption tower is connected with the air outlet of the liquid separator.

[0007] Furthermore, at least two adsorption towers are provided to ensure that at least one of the adsorption towers is in an adsorption condition, and at the same time, at least one of the adsorption towers is in a regeneration condition.

[0008] Furthermore, the liquid separation tank comprises:

[0009] Tank;

[0010] A compressor is disposed in the tank; and

[0011] A cooling component is arranged in the tank body.

[0012] Furthermore, the compressor is used to pressurize the target medium to 2.0-2.2 MPa.

[0013] Furthermore, the cooling component is used to cool the target medium to 15°C.

[0014] Furthermore, the cooling component includes a circulating water cooling component and a cooling water cooling component.

[0015] Beneficial effects of the utility model:

[0016] The formamide tail gas high-purity hydrogen production system provided by the utility model has a simple structure and a reasonable design, and can utilize the formamide tail gas to produce high-purity hydrogen, thereby saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0018] Figure 1 A block diagram of the principle of a system for producing high-purity hydrogen from formamide tail gas provided in one embodiment of the utility model;

[0019] Figure 2 for Figure 1 The structural view of the system for producing high-purity hydrogen from formamide tail gas is shown.

[0020] Reference numerals:

[0021] 100, pretreatment unit; 110, separation tank; 111, tank body; 112, compressor; 113, circulating water cooling assembly; 114, cooling water cooling assembly; 200, temperature-swing adsorption purification unit; 210, adsorption tower; 220, heat transfer sleeve; 230, heat transfer pipe; 241, first conduit; 242, second conduit; 243, first branch pipe; 244, second branch pipe; 245, first control valve; 246, second control valve; 250, heating device; 261, cooling sleeve; 262, cooling pipe; 270, circulation pump; 280, insulation sleeve. DETAILED DESCRIPTION

[0022] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0023] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically limited.

[0026] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] like Figure 1-2 As shown, the utility model provides a system for producing high-purity hydrogen from formamide tail gas, comprising a pretreatment unit 100 and a temperature-swing adsorption purification unit 200.

[0029] The pretreatment unit 100 is used to pretreat the formamide tail gas, specifically including pressurization and cooling, so as to separate the organic components in the formamide tail gas. The pretreatment unit 100 includes a liquid separator 110, which is connected to the tail gas discharge pipe of the formamide device. Specifically, the liquid separator 110 includes a tank body 111, a compressor 112 arranged in the tank body 111, and a cooling component. Among them, the compressor 112 is used to pressurize the target medium to 2.0~2.2Mpa. The cooling component is used to cool the target medium to 15°C. Specifically, the cooling component includes a circulating water cooling component 113 and a cooling water cooling component 114.

[0030] When in use, the formamide tail gas enters the liquid separation tank 110 and is first compressed by the compressor 112 to increase the pressure to 2.0-2.2 MPa; the compressed tail gas is cooled to ℃ by the cooling component, so that some components in the formamide tail gas are condensed into liquid, and the condensate is separated, thereby achieving the purpose of primary separation of the formamide tail gas.

[0031] The temperature swing adsorption purification unit 200 (i.e., TSA unit) includes an adsorption tower 210, in which a variety of adsorbents are arranged. The air inlet of the adsorption tower 210 is connected to the air outlet of the liquid separator 110. When in use, the gas pre-treated by the liquid separator 110 enters the adsorption tower 210, and under the action of the adsorbent in the adsorption tower 210, the hydrocarbons, amines, water and other components in the formamide tail gas are adsorbed. The purified gas is then piped to the boundary area from the air outlet of the adsorption tower 210 after being stabilized by a pressure regulating valve.

[0032] Preferably, the air inlet of the adsorption tower 210 is located at the bottom end of the adsorption tower 210 and the air outlet is located at the top end of the adsorption tower 210, so that after the gas enters the adsorption tower 210, it moves upward from the bottom end of the adsorption tower 210, thereby achieving the purpose of improving the adsorption effect.

[0033] Preferably, at least two adsorption towers 210 are provided to ensure that at least one adsorption tower 210 is in the adsorption condition, and at least one adsorption tower 210 is in the regeneration condition. When in use, when part of the adsorption towers 210 are in the adsorption condition, part of the adsorption towers 210 are still in the regeneration condition. When the adsorbent in the first part of the adsorption towers 210 is full and needs to be switched to the regeneration condition, the second part of the adsorption towers 210 has been regenerated and can adsorb again, thereby achieving the whole system, when the adsorption towers 210 are switched between the adsorption condition and the regeneration condition, there is no need to stop and wait, thereby achieving the purpose of improving efficiency.

[0034] Specifically, the temperature swing adsorption unit 200 also includes a heat-conducting sleeve 220, a heat-conducting pipe 230, a first conduit 241, a second conduit 242, a first branch pipe 243, a second branch pipe 244, a first control valve 245, a second control valve 246, a heating device 250, a cooling device, a circulation pump 270 and a heat-conducting sleeve 220.

[0035] The heat-conducting sleeve 220 is sleeved outside the adsorption tower 210. The heat-conducting pipe 230 is installed in the heat-conducting sleeve 220. The outlet end of the first conduit 241 is connected to the inlet end of the heat-conducting pipe 230. The inlet end of the second conduit 242 is connected to the outlet end of the heat-conducting pipe 230. The inlet end of the first branch pipe 243 is connected to the outlet end of the second conduit 242, and the outlet end is connected to the inlet end of the first conduit 241. The inlet end of the second branch pipe 244 is connected to the outlet end of the second conduit 242, and the outlet end is connected to the inlet end of the first conduit 241. The first control valve 245 is arranged on the first branch pipe 243. Preferably, two first control valves 245 are arranged, and the two first control valves 245 are respectively arranged at both ends of the first branch pipe 243, so as to prevent the heat of the heat-conducting medium in the first branch pipe 243 from being transferred to the heat-conducting medium in the second branch pipe 244 during the cooling process, thereby causing the fluid temperature in the second branch pipe 244 to rise, thereby affecting the cooling efficiency. The second control valve 246 is arranged on the second branch pipe 244. Preferably, two second control valves 246 are provided, and the two second control valves 246 are respectively provided at both ends of the second branch pipe 244 to prevent the heat of the heat-conducting medium in the first branch pipe 243 from being transferred to the second branch pipe 244 during heating, thereby causing the temperature of the heat-conducting medium in the first branch pipe 243 to decrease, thereby affecting the heating efficiency.

[0036] The heating device 250 is used to heat the heat-conducting medium in the first branch pipe 243. In this embodiment, the heating device 250 is an electric heating device 250, and the first branch pipe 243 is wound around the heating device 250, so as to achieve the purpose of heating the heat-conducting medium in the first branch pipe 243.

[0037] The cooling device is used to heat the heat-conducting medium in the second branch pipe 244. Specifically, the cooling device includes a cooling jacket 261 and a cooling pipe 262 disposed in the cooling jacket 261, and a cooling medium circulates in the cooling pipe 262. The second branch pipe 244 is wound around the cooling jacket 261. When in use, the cooling medium circulates in the cooling pipe 262, thereby carrying the heat of the cooling jacket 261, thereby achieving the purpose of cooling the heat-conducting medium in the second branch pipe 244.

[0038] The circulation pump 270 is disposed on the first conduit 241 and / or the second conduit 242 .

[0039] During the heating process of the adsorption tower 210, the second control valve 246 and the cooling device are closed, and at the same time, the first control valve 245, the heating device 250 and the circulation pump 270 are opened. Under the action of the circulation pump 270, the heat-conducting medium circulates in the heat-conducting pipe 230, the first conduit 241, the first branch pipe 243 and the second conduit 242. During the flow of the heat-conducting medium in the first branch pipe 243, under the action of the heating device 250, the heating device 250 heats the heat-conducting medium in the first branch pipe 243, and the heated heat-conducting medium enters the heat-conducting pipe 230, thereby achieving the purpose of heating the adsorption tower 210.

[0040] In the process of cooling the adsorption tower 210, the first control valve 245 and the heating device 250 are closed, and at the same time, the second control valve 246, the cooling device and the circulation pump 270 are opened. Under the action of the circulation pump 270, the heat transfer medium circulates in the heat transfer pipe 230, the first conduit 241, the second branch pipe 244 and the second conduit 242. When the heat transfer medium passes through the cooling device, under the action of the cooling device, the cooling device cools down the heat transfer medium in the second branch pipe 244, and the cooled heat transfer medium enters the heat transfer pipe 230, thereby achieving the purpose of cooling the adsorption tower 210.

[0041] The outer shell of the heat-conducting sleeve 220 is provided with a heat-insulating sleeve 280, so as to prevent the influence of the external temperature on the heating process and the cooling process.

[0042] In this embodiment, two adsorption towers 210 are provided, that is, when one adsorption tower 210 is in an adsorption condition, the other adsorption tower 210 is in a regeneration condition, so that the adsorption tower 210 completes a complete "adsorption-regeneration" cycle, thereby achieving the purpose of continuous separation and purification of the gas.

[0043] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A system for producing high-purity hydrogen from formamide tail gas, characterized in that: include: A pretreatment unit (100) comprises a liquid separation tank (110), wherein the liquid separation tank (110) is connected to an exhaust gas emission pipe of a formamide device; as well as A temperature-variable adsorption purification unit (200) comprises an adsorption tower (210), wherein an air inlet of the adsorption tower (210) is connected to an air outlet of the liquid separation tank (110).

2. The system for producing high-purity hydrogen from formamide tail gas according to claim 1, characterized in that: At least two adsorption towers (210) are provided to ensure that at least one of the adsorption towers (210) is in an adsorption condition, and at the same time, at least one of the adsorption towers (210) is in a regeneration condition.

3. The system for producing high-purity hydrogen from formamide tail gas according to claim 1 or 2, characterized in that: The liquid separation tank (110) comprises: Tank body (111); A compressor (112) is disposed in the tank (111); and A cooling component is arranged in the tank body (111).

4. The system for producing high-purity hydrogen from formamide tail gas according to claim 3, characterized in that: The compressor (112) is used to increase the pressure of the target medium to 2.0-2.2 MPa.

5. The system for producing high-purity hydrogen from formamide tail gas according to claim 3, characterized in that: The cooling component is used to cool the target medium to 15°C.

6. The system for producing high-purity hydrogen from formamide tail gas according to claim 3, characterized in that: The cooling component comprises a circulating water cooling component (113) and a cooling water cooling component (114).

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