Reactor for preparing clean fuel from methanol

Abstract

The invention discloses a new type of reactor for preparing clean fuel from methanol, comprising a machine body, a catalytic component, a gas mixing and distribution component, and a heat exchange component, characterized in that: a mixed gas inlet is provided at the top of the machine body and a reaction gas outlet is provided at the bottom; the mixed gas inlet is connected to the gas mixing and distribution component; a plurality of distributors are evenly distributed at the bottom of the gas mixing and distribution component; the bottom of the distributor is connected to the catalytic component; and a heat exchange component is provided at the periphery of the catalytic component. The heat exchange component can realize the constant temperature of the reaction, the gas mixing and distribution component can reduce the pressure of the mixed gas entering, so that the reaction is more thorough in the catalytic component, and multiple catalytic components can improve the reaction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of reactors for preparing clean fuel from methanol, and in particular to a reactor for preparing clean fuel from methanol. Background Art

[0002] Based on the methanol to olefins process, Mobil discovered that methanol can be used to produce gasoline through a catalyst, and subsequently developed methanol to gasoline processes, including fixed bed and fluidized bed processes.

[0003] China is rich in coal resources, and it is very suitable to take the coal-methanol economic route. Methanol has been rapidly developed as a downstream product of chemical basic raw materials, such as methanol-to-olefins, methanol-to-ethylene glycol, and methanol-to-clean fuels. At present, methanol-to-clean fuels have low yields, large investments, and high operating pressures. The superiority of methanol-to-clean fuels has led to the rapid development of methanol-to-clean fuels. However, there is a large market demand for methanol-to-clean fuels, especially methanol-to-clean fuels with high octane ratings and the National VI standard, but there are not many efficient and highly selective ones. Methanol-to-clean fuels are highly exothermic reactions, and there are also heat transfer problems. The requirements for catalyst selectivity and reaction conditions are that if you want conversion rate, you have to sacrifice quality, and if you want quality, you have to sacrifice conversion rate.

[0004] The multi-stage riser reactor with a central catalyst loop, Chinese patent number CN03825360.7, is a methanol-to-clean fuel reactor applied for by Mobil Corporation, which details the principle of preparing clean fuel from methanol.

[0005] The high-efficiency reactor for methanol-to-gasoline with Chinese patent number 201620839156.3 is divided into three parts in the cylinder, namely, an upper catalyst bed section, a middle air intake / heat exchange tube section and a lower catalyst bed section. The feed gas enters the reactor from the upper catalyst bed section, and the circulating gas enters the reactor from the middle air intake / heat exchange tube section. The middle air intake / heat exchange tube section is composed of a number of open-hole heat exchange tubes uniformly distributed in the cylinder. The heat exchange tubes or the space between the heat exchange tubes are connected to the circulating gas inlet. The space between the heat exchange tubes or the heat exchange tubes are filled with catalysts and communicate with the upper catalyst bed section and the lower catalyst bed section. There is a reaction product outlet at the bottom of the reactor, and the circulating gas inlet is communicated with the heat exchange tubes of the middle air intake / heat exchange tube section, and communicated with the upper catalyst bed section and the lower catalyst bed section. The circulating gas inlet is connected to the heat exchange tubes of the middle air intake / heat exchange tube section, and communicated with the upper catalyst bed section and the lower catalyst bed section. The circulating gas exchanges heat with the adjacent gas flowing through the catalyst in the axial direction through the heat exchange tubes in countercurrent flow, and is continuously radially injected into the catalyst bed in the space between the heat exchange tubes through the small holes in the heat exchange tube walls, mixes with the gas in the original catalyst bed, and reacts radially and axially together, and then flows out of the reactor from the reaction product outlet at the bottom of the reactor, or the circulating gas inlet is connected to the space between the heat exchange tubes of the middle air inlet / heat exchange tube group. The heat exchange tubes are filled with catalysts and are connected with the upper catalyst bed section and the lower catalyst bed section. The circulating gas exchanges heat with the adjacent gas flowing through the catalyst in the axial direction through the space between the heat exchange tubes, and is continuously radially injected into the catalyst bed through the small holes in the heat exchange tube walls, mixes with the gas in the original catalyst bed, and reacts radially and axially together, and then flows out of the reactor from the reaction product outlet at the bottom of the reactor. This device focuses on solving the problem of temperature control of the reactor. Loading the catalyst into the heat exchange tube can effectively control the reactor temperature. However, since the heat exchange tube of this device is small in size and multiple heat exchange tubes are loaded into the cylinder, the cross-sectional area of ​​a single heat exchange tube is small, the actual use area of ​​the catalyst is reduced, and the conversion efficiency is poor.

[0006] The tubular countercurrent composite fixed bed thermostatic reactor of Chinese Patent No. 201720049434.X consists of a cylinder, thermostatic tubes, a gas distributor, a tube sheet, a support grid, a feed port, a discharge port, a quenching gas inlet, a catalyst and a manhole, and is characterized in that: the feed port and the quenching gas inlet are located on the side of the cylinder and are connected to the cylinder, and the discharge port is located at the lower end of the cylinder; the tube sheet, the gas distributor, the thermostatic tubes and the support grid are located in the cylinder; the thermostatic tubes are fixed on the tube sheet; the catalyst A is loaded in the thermostatic tubes; and the catalyst B is loaded in the cylinder. The thermostatic tube structure in this patented technical solution is single and inefficient, and cannot meet the requirements of high reaction efficiency. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and provide a methanol-to-clean fuel reactor with high catalytic efficiency, constant temperature, stable operation, safety and reliability.

[0008] The present invention is achieved by the following methods:

[0009] A reactor for producing clean fuel from methanol comprises a body, a catalytic component, a gas mixing and distribution component, and a heat exchange component, and is characterized in that: a mixed gas inlet is provided at the top of the body and a reaction gas outlet is provided at the bottom; the mixed gas inlet is connected to the gas mixing and distribution component; a plurality of distributors are evenly distributed at the bottom of the gas mixing and distribution component; the bottom of the distributor is connected to the catalytic component; a heat exchange component is provided at the periphery of the catalytic component.

[0010] Furthermore, the gas mixing and distribution component is funnel-shaped, and one end with a small diameter is connected to the mixed gas inlet.

[0011] Furthermore, the distributor is an arc-shaped tube.

[0012] Furthermore, the catalytic assembly is a cylindrical axial radial catalytic reaction device, and the distributor is connected to the axis of the catalytic assembly.

[0013] Furthermore, the heat exchange component is an annular mesh structure distributed around the catalytic component.

[0014] Furthermore, the bottom of the reaction gas outlet is connected to a collector.

[0015] The beneficial effects of the present invention are as follows: the gas mixing and distribution assembly is a gas mixture that is distributed in each catalytic assembly after the return gas and the raw gas are mixed, and the funnel-shaped shape has a pressure-reducing effect. The distributor structure allows the catalytic assemblies of the present invention to be arranged in multiple forms in parallel or in series, thereby improving the reaction efficiency. The heat exchange assembly structure is reasonably designed, and the mesh annular structure increases the area of ​​the heat exchange zone, which can more efficiently increase the temperature of the reaction. The present invention realizes an efficient isothermal reaction of methanol to clean fuel, operates smoothly, and is safe, reliable, and economically efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of the present invention;

[0017] Figure 2 A top view of the present invention; DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Example:

[0022] like Figure 1-2 As shown, a reactor for preparing clean fuel from methanol, a reactor for preparing clean fuel from methanol, includes a body 1, a catalytic component 2, a gas mixing and distribution component 3, and a heat exchange component 4, and is characterized in that: a mixed gas inlet 5 is provided on the top of the body 1 and a reaction gas outlet 6 is provided on the bottom; the mixed gas inlet 5 is connected to the gas mixing and distribution component 3; a plurality of distributors 7 are evenly distributed on the bottom of the gas mixing and distribution component 3; the bottom of the distributor 7 is connected to the catalytic component 2; a heat exchange component 4 is provided on the periphery of the catalytic component 2.

[0023] Furthermore, the gas mixing and distribution component 3 is funnel-shaped, and one end with a small diameter is connected to the mixed gas inlet 5 .

[0024] Furthermore, the distributor 7 is an arc-shaped tube.

[0025] Furthermore, the catalytic assembly 2 is a cylindrical axial radial catalytic reaction device, and the distributor 7 is connected to the axis of the catalytic assembly 2.

[0026] Furthermore, the heat exchange component 4 is an annular mesh structure distributed around the catalytic component 2 .

[0027] Furthermore, the bottom of the reaction gas outlet 6 is connected to a collector 8 .

[0028] Working principle: the catalytic component 2 is an axial radial catalytic reaction device; the gas mixing and distribution component 3 is a mixture of return gas and raw gas and then distributed to each catalytic component 2. The funnel-shaped structure of the gas mixing and distribution component 3 has a pressure reduction effect; the heat exchange component 4 is evenly distributed on the periphery of the catalytic component 2, and plays a role in heat transfer and maintaining a constant temperature. The raw gas enters the gas mixing and distribution component 3 through the mixed gas inlet 5, and enters the axis of the catalytic component 2 in turn through the terminal distributor 7 of the gas mixing and distribution component 3. The raw synthesis gas is discharged from the reaction gas outlet 6 after the reaction of the catalytic component 2. After the collector 8 recovers the oil product, the remaining gas returns to the gas mixing and distribution component 3 through the heat exchange component 4 to mix with the raw gas.

[0029] The reaction of the present invention is carried out at a constant temperature, and the temperature is controlled to be constant by the heat exchange component 4. The heat exchange component 4 is evenly distributed on the periphery of the catalytic component 2, and the heat of reaction is removed by the heat exchange component 4 to ensure constant temperature. The catalytic component 2 is an axial radial reaction, which can be connected in parallel, in series, or in parallel and in series at the same time, and the number is determined according to the scale. The outlet of the distributor 7 of the gas mixing and distribution component 3 corresponds to the number of catalytic components 2 and is arranged at the axis of the catalytic component 2. The logistics of the heat exchange component 4 can be liquid or gas.

[0030] The above description is only a preferred embodiment of the present invention and is 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 reactor for preparing clean fuel from methanol, comprising a body (1), a catalytic component (2), a gas mixing and distribution component (3), and a heat exchange component (4), characterized in that: The body (1) is provided with a mixed gas inlet (5) at the top and a reaction gas outlet (6) at the bottom; the mixed gas inlet (5) is connected to a gas mixing and distribution component (3); a plurality of distributors (7) are evenly distributed at the bottom of the gas mixing and distribution component (3); the bottom of the distributor (7) is connected to a catalytic component (2); a heat exchange component (4) is provided at the periphery of the catalytic component (2); the gas mixing and distribution component (3) is funnel-shaped, with one end with a small diameter connected to the mixed gas inlet (5), and the funnel-shaped shape has a pressure reduction effect; the catalytic component (2) is a cylindrical axial radial catalytic reaction device, and the distributor (7) is connected to the axis of the catalytic component (2); the heat exchange component (4) is an annular mesh structure distributed at the periphery of the catalytic component (2), and the heat exchange component (4) plays a role in heat transfer and maintaining a constant temperature; the bottom of the reaction gas outlet (6) is connected to a collector (8); the distributor (7) is an arc-shaped tube; The raw gas enters the axis of the catalyst component (2) through the mixed gas inlet (5), the gas mixing and distribution component (3) and the distributor (7) in sequence. The raw synthesis gas is discharged from the reaction gas outlet (6) after the reaction in the catalyst component (2). After the oil product is recovered by the collector (8), the remaining gas returns to the gas mixing and distribution component (3) through the heat exchange component (4) to be mixed with the raw gas.

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