Coal gas dewatering and drying device and system

Abstract

The application provides a coal gas dehydration drying device and system, and relates to coal gas drying; wherein the coal gas dehydration drying device comprises a coal gas inlet pipe, a high-temperature gas inlet pipe, a discharge chimney, a water vapor diffusion pipeline, a coal gas outlet pipe and at least two coal gas dehydrators; the coal gas inlet pipe and the high-temperature gas inlet pipe are in communication with one of the coal gas dehydrators; when the coal gas inlet pipe is in communication with the coal gas dehydrator, the outlet end of the coal gas dehydrator is in communication with the coal gas outlet pipe; when the high-temperature gas inlet pipe is in communication with one of the coal gas dehydrators, the outlet end of the coal gas dehydrator is in communication with the discharge chimney and the water vapor diffusion pipeline. The application improves dehydration efficiency and realizes regeneration and recycling of the dehydrator.

Description

Technical Field

[0001] This application relates to the field of coal gas drying, and more specifically, to a coal gas dehydration and drying apparatus and system. Background Technology

[0002] Industrial gas, as an important energy source and chemical raw material, is widely used in industries such as steel, chemicals, and ceramics. Its production typically employs processes such as coal gasification and coke oven gas recovery, which inevitably introduce moisture. Since the saturated solubility of water vapor in gas decreases significantly with decreasing temperature, when the gas temperature drops in the pipeline, supersaturated water vapor condenses into liquid water. This not only reduces the calorific value and efficiency of the gas but can also cause engineering problems such as pipeline corrosion and valve freezing. In existing technologies, gas dehydration mainly employs methods such as condensation separation, adsorption drying, and membrane separation. Condensation separates moisture by cooling, but it is energy-intensive; adsorption uses desiccants such as molecular sieves, which, while effective, suffers from difficulties in adsorbent regeneration; membrane separation technology, while simple in equipment, requires strict gas pretreatment and is prone to membrane fouling. All these methods face the challenge of balancing dehydration efficiency with operating costs in practical applications. Utility Model Content

[0003] The purpose of this application is to provide a coal gas dehydration and drying device and system that can dry and dehydrate coal gas, thereby improving dehydration efficiency and reducing operating costs.

[0004] In a first aspect, this utility model provides a coal gas dehydration and drying device, which includes a coal gas inlet pipe, a high-temperature gas inlet pipe, an exhaust chimney, a water vapor venting pipe, a coal gas outlet pipe, and at least two coal gas dehydrators. The coal gas inlet pipe and the high-temperature gas inlet pipe are selectively connected to one of the coal gas dehydrators. When the coal gas inlet pipe is connected to the coal gas dehydrator, the outlet end of the coal gas dehydrator is connected to the coal gas outlet pipe. When the high-temperature gas inlet pipe is connected to one of the coal gas dehydrators, the outlet end of the coal gas dehydrator is connected to the exhaust chimney and the water vapor venting pipe.

[0005] In an optional embodiment, at least one of the gas dehydrators is connected to the gas inlet pipe, and the gas dehydrator not connected to the gas inlet pipe is connected to the high-temperature gas inlet pipe.

[0006] In an optional implementation, each of the gas dehydrators is alternately connected to the gas inlet pipe and the high-temperature gas inlet pipe.

[0007] In an optional embodiment, the number of gas dehydrators is two, and a three-way valve is provided between the gas inlet pipe and the two gas dehydrators.

[0008] In an optional embodiment, a three-way valve is provided between the high-temperature gas inlet pipe and the two gas dehydrators.

[0009] In an optional embodiment, a three-way valve is provided between the gas dehydrator, the gas outlet pipe, and the water vapor venting pipe.

[0010] In an optional embodiment, the gas inlet pipe includes a main gas inlet pipe and several branch gas inlet pipes, each of the branch gas inlet pipes being connected to the main gas inlet pipe, and each branch gas inlet pipe being connected to a gas dehydrator.

[0011] In an optional embodiment, the high-temperature gas inlet pipe includes a high-temperature gas inlet main pipe and a plurality of high-temperature gas inlet branch pipes, each of the high-temperature gas inlet branch pipes being connected to the high-temperature gas inlet main pipe, and one of the high-temperature gas inlet branch pipes being connected to one of the gas dehydrators.

[0012] In an optional embodiment, the gas dehydrator includes a shell, baffles, and heat exchange tube bundles. The shell contains a desiccant, and both the baffles and the heat exchange tube bundles are installed inside the shell.

[0013] Secondly, this utility model provides a coal gas dehydration and drying system, including a tail gas emission device and the coal gas dehydration and drying device described in the foregoing embodiments, wherein the tail gas emission device is connected to the high-temperature gas inlet pipe.

[0014] Compared to existing technologies, the advantages of this application are: This application improves the dehydration efficiency by using two or more gas dehydrators to alternately dry and dehydrate the gas. Furthermore, after the gas dehydrator finishes dehydration, this application uses high-temperature gas input to heat the gas dehydrator, causing the moisture to be removed, thereby enabling the gas dehydrator to be reused and reducing operating costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic planar view of the gas dehydration and drying apparatus in some embodiments is shown; Figure 2 A schematic plan view of the gas dehydration and drying apparatus from another angle is shown in some embodiments; Figure 3Control flow diagrams for three-way valve 1 in some embodiments are shown; Figure 4 The control flow diagrams for the three-way valve 3 in some embodiments are shown; Figure 5 A plan view (partial cross-section) of a gas dehydrator is shown in some embodiments.

[0017] Explanation of key component symbols: 100-Gas inlet pipe; 200-High temperature gas inlet pipe; 300-Emission chimney; 400-Water vapor venting pipe; 500-Gas outlet pipe; 600-Gas dehydrator; 610-Shell; 611-Inlet; 612-Outlet; 620-Baffle plate; 630-Heat exchange tube bundle; 640-Support; 700-Three-way valve one; 800-Three-way valve two; 900-Three-way valve three. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] Example 1 This embodiment is applicable to the drying and dehydration of industrial gas. Industrial gases, such as blast furnace gas, coal gasification, and converter gas, often contain a significant amount of moisture. When using industrial gas as fuel to drive an internal combustion engine, it is necessary to ensure that the industrial gas is free of free water at 30°C.

[0024] Please see Figure 1 and Figure 2 This embodiment provides a gas dehydration and drying device, which includes a gas inlet pipe 100, a high-temperature gas inlet pipe 200, an exhaust chimney 300, a water vapor venting pipe 400, a gas outlet pipe 500, and at least two gas dehydrators 600.

[0025] The gas inlet pipe 100 includes a main gas inlet pipe and several branch gas inlet pipes. Each branch gas inlet pipe is connected to the main gas inlet pipe, and each branch gas inlet pipe is connected to a gas dehydrator 600.

[0026] The high-temperature gas inlet pipe 200 includes a high-temperature gas inlet main pipe and several high-temperature gas inlet branch pipes. Each high-temperature gas inlet branch pipe is connected to the high-temperature gas inlet main pipe, and one high-temperature gas inlet branch pipe is connected to a gas dehydrator 600.

[0027] The high-temperature gas here can be exhaust gas or other forms of heat source, and the temperature of the high-temperature gas is sufficient to evaporate and vaporize water.

[0028] The gas inlet pipe 100 and the high-temperature gas inlet pipe 200 are selectively connected to a gas dehydrator 600. When the gas inlet pipe 100 is connected to the gas dehydrator 600, the outlet end of the gas dehydrator 600 is connected to the gas outlet pipe 500. When the high-temperature gas inlet pipe 200 is connected to the gas dehydrator 600, the outlet end of the gas dehydrator 600 is connected to the exhaust chimney 300 and the water vapor venting pipe 400.

[0029] At least one gas dehydrator 600 is connected to the gas inlet pipe 100, and the gas dehydrator 600 not connected to the gas inlet pipe 100 is connected to the high-temperature gas inlet pipe 200. Each gas dehydrator 600 is connected to the gas inlet pipe 100 and the high-temperature gas inlet pipe 200 alternately.

[0030] In this embodiment, the number of gas dehydrators 600 can be set to two.

[0031] Please see Figure 3 A three-way valve 700 is provided between the gas inlet pipe 100 and the two gas dehydrators 600. The three ports of the three-way valve 700 are respectively connected to the gas inlet pipe 100 and the two gas dehydrators 600. After the gas enters from the gas inlet pipe 100, it is controlled by the three-way valve 700 to be transported to one of the gas dehydrators 600.

[0032] Please continue reading. Figure 1 A three-way valve 2800 is provided between the high-temperature gas inlet pipe 200 and the two gas dehydrators 600. The three ports of the three-way valve 2800 are respectively connected to the high-temperature gas inlet pipe 200 and the two gas dehydrators 600. After the high-temperature gas enters from the high-temperature gas inlet pipe 200, it is controlled by the three-way valve 2800 to be transported to one of the gas dehydrators 600.

[0033] Please see Figure 4 A three-way valve 3900 is installed between a gas dehydrator 600, a gas outlet pipe 500, and a water vapor venting pipe 400. The three ports of the three-way valve 3900 are respectively connected to the gas dehydrator 600, the gas outlet pipe 500, and the water vapor venting pipe 400. When the gas in the gas dehydrator 600 is gas, the three-way valve 3900 controls the gas to be delivered to the gas outlet pipe 500. When the gas in the gas dehydrator 600 is high-temperature gas, the three-way valve 3900 controls the gas to be delivered to the water vapor venting pipe 400. At this time, the temperature of the high-temperature gas decreases after heat exchange.

[0034] Please see Figure 1 , Figure 3 and Figure 4 In this embodiment, the three-way valve 1 700, three-way valve 2 800 and three-way valve 3 900 described above are used to achieve simple switching, and the operation is simple and convenient.

[0035] In some other embodiments, the number of gas dehydrators 600 may be three, four or more, and there is no limitation herein.

[0036] Please see Figure 5 The gas dehydrator 600 includes a shell 610, a baffle plate 620 and a heat exchange tube bundle 630. The shell 610 contains a desiccant, and the baffle plate 620 and the heat exchange tube bundle 630 are both installed inside the shell 610.

[0037] In this embodiment, a desiccant is first used to absorb moisture from the coal gas, thus drying the gas. Then, the saturated desiccant is heated by high-temperature gas to remove the moisture. Multiple sets of coal gas dehydrators 600 are used alternately. In this embodiment, the desiccant can be set to calcium chloride, silica gel, or other desiccants with drying functions.

[0038] To improve the dryness of the gas, the baffle plate 620 can extend the travel of the gas in the gas dehydrator 600, thereby ensuring that the moisture in the gas is fully absorbed.

[0039] In some other embodiments, the heat exchange tube bundle 630 may also be a coil type.

[0040] In this embodiment, the gas dehydrator 600 also includes a support 640, which is located below the housing 610 so that the housing 610 is at a certain height above the ground. The housing 610 is provided with an inlet 611 and an outlet 612. The inlet 611 is located above the housing 610, and the outlet 612 is located below the housing 610. When the service life of the desiccant reaches its limit, the desiccant needs to be replaced. That is, the desiccant that can no longer be used is first released from the outlet 612, and then new desiccant is poured in from the inlet 611.

[0041] Please see Figure 1 , Figure 3 and Figure 4 Based on the above, the following description uses a gas dehydration and drying device comprising two gas dehydrators 600 as an example, and the usage process of one of the gas dehydrators 600 is explained: S100. After the gas enters through the gas inlet pipe 100, it is controlled by the three-way valve 700 to enter the first gas dehydrator 600 for drying. Then, it is controlled by the three-way valve 900 to output the gas from the gas outlet pipe 500. When the desiccant in the gas dehydrator 600 is saturated with water, it is controlled by the three-way valve 700 to switch to the second gas dehydrator 600 for continued drying.

[0042] S200. After the high-temperature gas enters through the high-temperature gas inlet pipe 200, it is controlled by the three-way valve 2800 to enter the first gas dehydrator 600 and flow along the heat exchange tube bundle 630. Finally, it is discharged from the exhaust chimney 300. Due to the high temperature of the high-temperature gas, it has a large amount of heat energy, which can cause the moisture in the desiccant to be removed by heat. The removed moisture is controlled by the three-way valve 3900 and discharged from the water vapor vent pipe 400.

[0043] In this embodiment, two gas dehydrators 600 are used in parallel. One is used for gas drying and dehydration, and the other is used for desiccant drying and dehydration. The reuse rate is high, and the gas drying process is compact, requiring no waiting time and improving the dehydration efficiency.

[0044] This embodiment improves the dehydration efficiency by using two or more gas dehydrators 600 to alternately dry and dehydrate the gas. Furthermore, after the gas dehydrator 600 finishes dehydrating, this embodiment uses high-temperature gas input to heat the gas dehydrator 600, causing the moisture to be removed, thereby enabling the gas dehydrator 600 to be reused and reducing operating costs.

[0045] Example 2 Please see Figure 2 Based on the above embodiments, this embodiment provides a coal gas dehydration and drying system, which includes a tail gas emission device and the coal gas dehydration and drying device of Embodiment 1. The tail gas emission device is connected to the high-temperature gas inlet pipe 200.

[0046] This embodiment includes the gas dehydration and drying device provided in Embodiment 1; therefore, this embodiment possesses all the advantages of Embodiment 1. Furthermore, this embodiment utilizes the thermal energy of exhaust gas, embodying the concept of green and sustainable development, and offering high economic benefits.

[0047] In this embodiment, since the exhaust gas does not come into direct contact with the desiccant, the oxygen in the exhaust gas will not enter the gas, ensuring safe operation. At the same time, the dust and harmful substances in the exhaust gas will not affect the performance of the desiccant. Furthermore, since the heat source and the gas do not come into direct contact, the desiccant can be put into use immediately after regeneration without the need for gas replacement, ensuring smooth operation.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A gas dehydration and drying device, characterized in that, It includes a gas inlet pipe, a high-temperature gas inlet pipe, an exhaust chimney, a water vapor venting pipe, a gas outlet pipe, and at least two gas dehydrators. The gas inlet pipe, the high-temperature gas inlet pipe, and one of the gas dehydrators are selectively connected. When the gas inlet pipe is connected to the gas dehydrator, the outlet end of the gas dehydrator is connected to the gas outlet pipe. When the high-temperature gas inlet pipe is connected to one of the gas dehydrators, the outlet end of the gas dehydrator is connected to the exhaust chimney and the water vapor venting pipe.

2. The gas dehydration and drying apparatus as described in claim 1, characterized in that, At least one of the gas dehydrators is connected to the gas inlet pipe, and the gas dehydrator not connected to the gas inlet pipe is connected to the high-temperature gas inlet pipe.

3. The gas dehydration and drying apparatus as described in claim 2, characterized in that, Each of the gas dehydrators is alternately connected to the gas inlet pipe and the high-temperature gas inlet pipe.

4. The gas dehydration and drying apparatus according to any one of claims 1 to 3, characterized in that, The number of gas dehydrators is two, and a three-way valve is provided between the gas inlet pipe and the two gas dehydrators.

5. The gas dehydration and drying apparatus as described in claim 4, characterized in that, A three-way valve is provided between the high-temperature gas inlet pipe and the two gas dehydrators.

6. The gas dehydration and drying apparatus as described in claim 5, characterized in that, A three-way valve is provided between the gas dehydrator, the gas outlet pipe and the water vapor venting pipe.

7. The gas dehydration and drying apparatus according to any one of claims 1 to 3, characterized in that, The gas inlet pipe includes a main gas inlet pipe and several branch gas inlet pipes. Each branch gas inlet pipe is connected to the main gas inlet pipe, and each branch gas inlet pipe is connected to a gas dehydrator.

8. The gas dehydration and drying apparatus according to any one of claims 1 to 3, characterized in that, The high-temperature gas inlet pipe includes a high-temperature gas inlet main pipe and several high-temperature gas inlet branch pipes. Each of the high-temperature gas inlet branch pipes is connected to the high-temperature gas inlet main pipe, and each of the high-temperature gas inlet branch pipes is connected to one of the gas dehydrators.

9. The gas dehydration and drying apparatus according to any one of claims 1 to 3, characterized in that, The gas dehydrator includes a shell, baffles, and heat exchange tube bundles. The shell contains a desiccant, and both the baffles and the heat exchange tube bundles are installed inside the shell.

10. A gas dehydration and drying system, characterized in that, It includes a tail gas emission device and a coal gas dehydration and drying device according to any one of claims 1 to 9, wherein the tail gas emission device is connected to the high-temperature gas inlet pipe.

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