Methanol water vaporizing device based on methanol catalytic combustion tail gas waste heat utilization and application of methanol water vaporizing device

Abstract

The invention relates to a methanol water vaporization device based on methanol catalytic combustion tail gas waste heat utilization and application thereof, and belongs to the technical field of heat exchangers for methanol water solution vaporization. The methanol water vaporizing device comprises a methanol vaporizing chamber, a methanol vaporizing channel, a tail gas channel and a methanol pump; a methanol aqueous solution inlet and a methanol water vapor outlet are formed in the methanol vaporization channel; a tail gas inlet and a tail gas outlet are formed in the tail gas channel; the methanol water solution inlet is formed in the lower part of the tail gas outlet end, and the methanol steam outlet is formed in the upper part of the tail gas inlet end; and the vaporization direction of the methanol aqueous solution in the methanol vaporization channel is opposite to the running direction of the tail gas in the tail gas channel. The U-shaped tail gas channel, the N-shaped methanol vaporization channel and the methanol water vaporization device with the methanol water vapor outlet formed in the upper portion of the tail gas inlet end are adopted, methanol can fully absorb heat of high-temperature tail gas, and the methanol vaporization efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchangers for methanol-water vaporization, and specifically relates to a methanol-water vaporization device based on utilization of waste heat of tail gas from catalytic combustion of methanol and application thereof. Background Art

[0002] Methanol steam reforming hydrogen production technology is a mature hydrogen production technology with high efficiency and low cost, which is widely used in industry. Its reaction principle is: under the action of catalyst, gaseous methanol and water vapor react to produce hydrogen and carbon dioxide. Methanol steam reforming hydrogen production has the characteristics of high hydrogen yield, low energy consumption cost, easy transportation and storage of raw materials, and high technical maturity.

[0003] In the methanol steam reforming hydrogen production technology, most of the traditional methanol-water solution vaporization devices use boiling methods such as electric heating or thermal oil heating. This method requires electric heating tubes or thermal oil coils to vaporize the methanol-water solution through additional energy supply, which is convenient to operate.

[0004] However, the above method requires an additional heat source, which increases energy consumption costs. In addition, heating by electric heating or thermal oil takes a long time, heats up slowly, and has low efficiency. Summary of the invention

[0005] In view of this, the present invention provides a methanol-water vaporization device based on the utilization of waste heat from tail gas from catalytic combustion of methanol. The methanol-water vaporization device vaporizes methanol aqueous solution through a high-temperature tail gas heat exchange vaporization method, thereby effectively improving the utilization rate of tail gas, reducing the energy consumption of methanol steam reforming to produce hydrogen, and saving costs.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions.

[0007] A methanol-water vaporization device based on the utilization of waste heat from tail gas of methanol catalytic combustion, comprising a methanol vaporization chamber, a methanol vaporization channel, a tail gas channel and a methanol pump, wherein the methanol vaporization channel and the tail gas channel are both arranged inside the methanol vaporization chamber;

[0008] The methanol vaporization channel is provided with a methanol aqueous solution inlet and a methanol water vapor outlet;

[0009] The tail gas channel is provided with a tail gas inlet and a tail gas outlet, and the tail gas inlet and the tail gas outlet are located on a surface of the methanol vaporization chamber;

[0010] The methanol aqueous solution inlet is located at the lower part of the tail gas outlet end of the tail gas channel, and the methanol water vapor outlet is located at the upper part of the tail gas inlet end of the tail gas channel;

[0011] The tail gas channel is in a "U"-shaped structure, and the methanol vaporization channel is in a stretched "N"-shaped structure;

[0012] The direction in which the methanol aqueous solution in the methanol vaporization channel is vaporized is opposite to the running direction of the tail gas in the tail gas channel.

[0013] In the present invention, viewed from the surface of the methanol vaporization chamber provided with the exhaust gas inlet and the exhaust gas outlet, the exhaust gas channel presents an inverted "U"-shaped structure; the methanol vaporization channel presents an "N"-shaped structure; viewed from a side surface adjacent to the surface of the methanol vaporization chamber provided with the exhaust gas inlet and the exhaust gas outlet, the methanol vaporization channel presents a planar structure.

[0014] As an optional implementation manner, the methanol aqueous solution inlet is located at the lower part (or lower side) of the tail gas outlet end of the tail gas channel.

[0015] As an optional implementation, the methanol aqueous solution inlet is arranged at the bottom of a side surface adjacent to the surface of the methanol vaporization chamber where the tail gas inlet and the tail gas outlet are located.

[0016] In the present invention, in the methanol vaporization channel, the methanol aqueous solution inlet is at the lower side (or below, or at the lower part) of the tail gas outlet end, and the methanol water vapor outlet is at the upper part (or above or at the upper side) of the tail gas inlet end. The tail gas channel is in a "U" shape, and the methanol vaporization channel is in an "N" shape. The direction in which methanol is vaporized in the methanol vaporization channel is opposite to the running direction of the tail gas in the tail gas channel, which is conducive to more sufficient absorption of heat by methanol, thereby improving the efficiency of methanol vaporization.

[0017] As an optional implementation, the methanol water vapor outlet is arranged at the upper part (or upper side) of the tail gas inlet end.

[0018] As an optional implementation, the methanol water vapor outlet is located at the upper part of the surface of the methanol vaporization chamber where the tail gas inlet and the tail gas outlet are located.

[0019] In the present invention, the methanol aqueous solution inlet is located at the lower part (or lower side) of the tail gas outlet end of the tail gas channel, and is arranged at the bottom of a side surface adjacent to the surface of the methanol vaporization chamber where the tail gas inlet and the tail gas outlet are located; the methanol water vapor outlet is on the upper side of the tail gas inlet end, and is located at the upper part of the surface of the methanol vaporization chamber where the tail gas inlet and the tail gas outlet are located. This arrangement allows the methanol aqueous solution to fully absorb the waste heat of the high-temperature tail gas, ensuring that methanol can be vaporized at the methanol water vapor outlet.

[0020] As an optional implementation manner, the tail gas inlet and the tail gas outlet are arranged on the same surface of the methanol vaporization chamber.

[0021] As an optional implementation manner, the tail gas inlet, the tail gas outlet and the methanol water vapor outlet are arranged on the same surface of the methanol vaporization chamber.

[0022] As an optional implementation, the interior of the exhaust gas channel is provided with corrugated fins, which is beneficial to increase the heat exchange area and improve the heat exchange efficiency.

[0023] As an optional implementation, the methanol pump is connected to a PLC system for controlling the opening, closing and flow control of the methanol pump through the PLC system.

[0024] In the present invention, the flow rate of the methanol pump controls the flow rate of the liquid methanol aqueous solution. In the methanol water vaporization device of the present invention, there is almost no accumulation of liquid methanol.

[0025] As an optional implementation manner, the methanol pump is connected to the methanol-water solution inlet, and is used to pump the methanol-water solution into the methanol vaporization channel through the methanol pump.

[0026] As an optional embodiment, the methanol water vapor outlet is connected to a methanol reforming reactor for introducing vaporized methanol water vapor into the reforming reactor. That is, the methanol water vapor outlet is connected to a reforming reactor for providing methanol water vapor raw material for methanol reforming to produce hydrogen.

[0027] As an optional embodiment, the tail gas inlet is connected to the methanol reforming reactor, and is used to introduce the tail gas generated in the oxidation chamber of the methanol reforming reactor into the tail gas channel, so as to achieve heating of the methanol aqueous solution by the high-temperature tail gas and thus vaporize the methanol aqueous solution into methanol water vapor.

[0028] As an optional implementation, the methanol-water vaporization device is also connected to a tail gas exhaust pipe via the tail gas outlet, so as to exhaust the tail gas in the methanol-water vaporization device.

[0029] As an optional implementation, the exhaust gas exhaust pipe is connected to the exhaust gas outlet through the one-way valve, which is used to control the flow direction of the exhaust gas in one direction to prevent the exhaust gas from flowing back.

[0030] As an optional implementation, the methanol vaporization chamber is made of aluminum alloy.

[0031] In the present invention, the methanol vaporization chamber is made of aluminum alloy, which is conducive to heat transfer and more uniform temperature distribution. In addition, aluminum alloy has the advantages of light weight, easy machining, and easy integration.

[0032] As an optional embodiment, the concentration of the methanol aqueous solution is 10% vol to 100% vol (for example, 20% vol, 100% vol, 30% vol, 50% vol, 70% vol, 80% vol or 90% vol).

[0033] As an optional implementation, the tail gas is derived from tail gas produced by catalytic oxidation of methanol, and the temperature of the tail gas is 100-300° C. (for example, 150° C., 200° C., 250° C. or 280° C.).

[0034] As an optional implementation, the tail gas inlet of the methanol vaporization chamber is connected to the reforming reactor via an aluminum alloy end plate.

[0035] As an optional implementation, the methanol vaporization chamber is sealed with a special high-temperature resistant sealing ring.

[0036] As an optional implementation, the methanol vaporization chamber is insulated as a whole using thermal insulation cotton to reduce heat loss.

[0037] In the second aspect, the present invention also provides an application of the above-mentioned methanol-water vaporization device based on the utilization of waste heat from exhaust gas from catalytic combustion of methanol, wherein the methanol-water vaporization device is suitable for hydrogen production by methanol steam reforming, wherein the reforming reaction temperature is 200-300°C (for example, 220°C, 230°C, 250°C, 260°C or 280°C).

[0038] In the present invention, the above technical features can be freely combined to form a new technical solution without conflicting with each other.

[0039] The technical solution of the present invention has the following beneficial technical effects compared with the prior art:

[0040] (1) The present invention adopts a methanol-water vaporization device having a U-shaped tail gas channel and an N-shaped methanol vaporization channel, and arranges the methanol-water vapor outlet at the upper part of the tail gas inlet end, which is conducive to methanol to more fully absorb the heat of the high-temperature tail gas and improve the efficiency of methanol vaporization;

[0041] (2) By adopting the technical solution of the present invention, the methanol-water solution can fully absorb the waste heat of the tail gas through heat exchange, thereby changing from liquid to gas, without the need for an additional heat source, thereby effectively improving the heat utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0044] Figure 1 A schematic diagram of a methanol-water vaporization device according to an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of the three-dimensional structure of a methanol-water vaporization device according to an embodiment of the present invention;

[0046] Among them, marked as: ①-methanol vaporization chamber; ②-exhaust gas inlet; ③-exhaust gas outlet; ④-methanol pump; ⑤-methanol aqueous solution inlet; ⑥-methanol water vapor outlet; A-the bottom of the side adjacent to the surface of the methanol vaporization chamber where the exhaust gas inlet and the exhaust gas outlet are located; B-the upper part of the surface of the methanol vaporization chamber where the exhaust gas inlet and the exhaust gas outlet are located; C-exhaust gas inlet direction, D-exhaust gas outlet direction. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0048] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0049] Example 1

[0050] A methanol-water vaporization device based on the utilization of waste heat from methanol catalytic combustion tail gas, such as Figure 1 As shown, it includes a methanol vaporization chamber ①, a methanol vaporization channel, an exhaust gas channel and a methanol pump ④, and the methanol vaporization channel and the exhaust gas channel are both arranged inside the methanol vaporization chamber ①.

[0051] Specifically, the methanol vaporization chamber is made of aluminum alloy; a methanol aqueous solution inlet ⑤ and a methanol water vapor outlet ⑥ are provided on the methanol vaporization channel; the methanol aqueous solution inlet ④ and the methanol water vapor outlet ④ are respectively arranged on the surface of the opposite side of the methanol vaporization chamber ①; the methanol vaporization channel is a stretched "N"-shaped structure, such as Figure 2As shown, from the surface of the methanol vaporization chamber provided with the exhaust gas inlet and the exhaust gas outlet, the methanol vaporization channel has an "N"-shaped structure; from a side surface adjacent to the surface of the methanol vaporization chamber provided with the exhaust gas inlet and the exhaust gas outlet, the methanol vaporization channel has a planar structure.

[0052] Figure 2 Only three "N"-shaped lines are drawn schematically. In fact, the methanol vaporization channel is a surface structure formed by continuously connecting multiple "N"-shaped structures in parallel. That is, when viewed from a side adjacent to the surface of the methanol vaporization chamber where the exhaust gas inlet and the exhaust gas outlet are provided, the methanol vaporization channel is a planar structure.

[0053] In the methanol-water vaporization device, an exhaust gas inlet ② and an exhaust gas outlet ③ are provided on the exhaust gas channel; the exhaust gas inlet ② and the exhaust gas outlet ③ are respectively arranged on the same surface of the methanol vaporization chamber ①; the exhaust gas channel is in a "U" shape, and the exhaust gas flows from C to D, such as Figure 2 As shown; from the surface of the methanol vaporization chamber provided with the tail gas inlet and the tail gas outlet, the tail gas channel is an inverted "U"-shaped structure.

[0054] In the methanol-water vaporization device, the methanol-water solution inlet ① is located at the lower part (or lower side) of the tail gas outlet ③ end of the tail gas channel, and is located at the bottom A of the side adjacent to the surface of the methanol vaporization chamber where the tail gas inlet and the tail gas outlet are located; the methanol-water vapor outlet is on the upper side of the tail gas inlet end, and is located at the upper part B of the surface of the methanol vaporization chamber where the tail gas inlet and the tail gas outlet are located. The methanol vaporization direction is from A along the "N"-shaped plane to B, such as Figure 2 As shown, that is, the methanol aqueous solution enters the methanol vaporization channel from A, reaches B along the "N"-shaped plane, and leaves the methanol vaporization channel from B; the direction in which the methanol aqueous solution vaporizes in the methanol vaporization channel is opposite to the running direction of the exhaust gas in the exhaust gas channel, as shown in FIG. Figure 2 shown.

[0055] The methanol pump ④ is connected to the methanol aqueous solution inlet ⑤, and is used to pump the methanol aqueous solution into the methanol vaporization channel through the methanol pump ④; the methanol water vapor outlet ④ is connected to the methanol reforming reactor, and is used to introduce the vaporized methanol water vapor into the reforming reactor to generate hydrogen through reforming hydrogen production reaction;

[0056] The tail gas inlet ② is connected to the methanol reforming reactor and is used to introduce the tail gas generated in the oxidation chamber of the methanol reforming reactor into the tail gas channel, so as to heat the methanol aqueous solution with the high-temperature tail gas and vaporize the methanol aqueous solution into methanol water vapor.

[0057] The methanol water vaporization device is also connected to a one-way valve and a tail gas exhaust pipe. Specifically, the one-way valve is connected to the tail gas outlet ③ in the methanol water vaporization device, and the tail gas exhaust pipe is connected to the one-way valve, which is used to perform one-way control on the flow direction of the tail gas to prevent the tail gas from flowing back. At the same time, the tail gas in the methanol water vaporization device is exhausted through the tail gas exhaust pipe.

[0058] Example 2

[0059] This embodiment provides a methanol-water vaporization device based on the utilization of waste heat from exhaust gas from catalytic combustion of methanol. The difference from Embodiment 1 is that the methanol pump ④ is also connected to the PLC system to control the opening, closing and flow control of the methanol pump through the PLC system.

[0060] Example 3

[0061] This embodiment provides a methanol-water vaporization device based on the utilization of waste heat from exhaust gas from catalytic combustion of methanol. The difference between this device and Embodiment 1 is that corrugated fins are provided inside the exhaust gas channel to increase the heat exchange area and improve the heat exchange efficiency.

[0062] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein. In the present invention, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in the field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0064] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A methanol-water vaporization device based on the utilization of waste heat from tail gas from methanol catalytic combustion, characterized in that: The methanol-water vaporization device comprises a methanol vaporization chamber, a methanol vaporization channel, an exhaust gas channel and a methanol pump, wherein the methanol vaporization channel and the exhaust gas channel are both arranged inside the methanol vaporization chamber; The methanol vaporization channel is provided with a methanol aqueous solution inlet and a methanol water vapor outlet; The tail gas channel is provided with a tail gas inlet and a tail gas outlet; The methanol-water solution inlet is at the lower part of the tail gas outlet end, and the methanol-water vapor outlet is at the upper part of the tail gas inlet end; The tail gas channel is in a "U"-shaped structure, and the methanol vaporization channel is in a stretched "N"-shaped structure; The direction in which the methanol aqueous solution in the methanol vaporization channel is vaporized is opposite to the running direction of the tail gas in the tail gas channel.

2. The methanol-water vaporization device based on the utilization of waste heat from methanol catalytic combustion tail gas as claimed in claim 1, characterized in that: The methanol aqueous solution inlet is located at the lower part (or lower side) of the tail gas outlet end of the tail gas channel; or / and The methanol water vapor outlet is arranged at the upper part of the tail gas inlet end; or / and The tail gas inlet and the tail gas outlet are arranged on the same surface of the methanol vaporization chamber.

3. The methanol-water vaporization device based on the utilization of waste heat from tail gas from catalytic combustion of methanol as claimed in claim 2 is characterized in that: The methanol aqueous solution inlet is arranged at the bottom of a side surface adjacent to the surface of the methanol vaporization chamber where the tail gas inlet and the tail gas outlet are located; or The methanol water vapor outlet is arranged at the upper part of the surface of the methanol vaporization chamber where the tail gas inlet and the tail gas outlet are located.

4. The methanol-water vaporization device based on the utilization of waste heat from methanol catalytic combustion tail gas according to any one of claims 1 to 3, characterized in that: The methanol pump is connected to the PLC system, and is used to control the opening, closing and flow control of the methanol pump through the PLC system; or / and The methanol water vapor outlet is connected to the methanol reforming reactor for introducing the vaporized methanol water vapor into the reforming reactor; or / and The tail gas inlet is connected to the methanol reforming reactor and is used to introduce the tail gas generated in the oxidation chamber of the methanol reforming reactor into the tail gas channel.

5. The methanol-water vaporization device based on the utilization of waste heat from methanol catalytic combustion tail gas as claimed in any one of claims 1 to 3, characterized in that: The methanol-water vaporization device is also connected to a tail gas exhaust pipeline via the tail gas outlet, so as to exhaust the tail gas in the methanol-water vaporization device.

6. The methanol-water vaporization device based on the utilization of waste heat from tail gas from catalytic combustion of methanol as claimed in claim 5, characterized in that: The exhaust pipe is connected to the exhaust outlet through the one-way valve, and is used to control the flow direction of the exhaust gas in one direction.

7. The methanol-water vaporization device based on the utilization of waste heat from methanol catalytic combustion tail gas according to any one of claims 1 to 3, characterized in that: The exhaust gas passage is provided with corrugated fins inside.

8. The methanol-water vaporization device based on the utilization of waste heat from methanol catalytic combustion tail gas according to any one of claims 1 to 3, characterized in that: The methanol vaporization chamber is made of aluminum alloy; or The concentration of the methanol aqueous solution is 10% vol to 100% vol; or The tail gas is derived from tail gas generated by catalytic oxidation of methanol, and the temperature of the tail gas is 100-300°C.

9. The methanol-water vaporization device based on the utilization of waste heat from methanol catalytic combustion tail gas according to any one of claims 1 to 3, characterized in that: The tail gas inlet of the methanol vaporization chamber is connected to the reforming reactor via an aluminum alloy end plate; or The methanol vaporization chamber is sealed by a high temperature resistant sealing ring; or The methanol vaporization chamber is insulated as a whole by using thermal insulation cotton.

10. An application of a methanol-water vaporization device based on the utilization of waste heat from methanol catalytic combustion tail gas as claimed in any one of claims 1 to 9, characterized in that: The methanol-water vaporization device is suitable for methanol-water steam reforming to produce hydrogen, wherein the reforming reaction temperature is 200-300°C.

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