Fixed constant-temperature sleeve for fixed fluidized bed reactor for carbon pre-deposition of methanol-to-olefin regenerated catalyst by C4

Abstract

The utility model discloses a fixed constant-temperature sleeve of a fixed fluidized bed experimental device for carbon pre-deposition of C4 in a methanol-to-olefin regenerated catalyst, and belongs to the technical field of carbon pre-deposition of methanol-to-olefin regenerated catalysts. The constant-temperature sleeve is composed of a constant-temperature sleeve body, a temperature controller and a temperature sensor, raw material gas and product gas conveying pipes surround the interior of the constant-temperature sleeve body, a constant-temperature belt is spirally wound in a single layer and sewn on the inner side of the constant-temperature sleeve through a flame-retardant sewing thread, and the constant-temperature belt is of a strip structure; the zipper consistent with the product gas conveying pipe in direction is embedded in the outer surface of the constant-temperature sleeve body, the temperature sensor is embedded in the inner side of the top end of the constant-temperature sleeve body, and the temperature controller is installed on the outer side of the bottom end of the constant-temperature sleeve body. The fixed constant-temperature sleeve device with the temperature controller is flexible and adjustable in temperature, easy to disassemble and replace and high in operability; local hot spots can be effectively avoided, and uniform heating of feed gas and product gas conveying pipes is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of pre-carbonization technology of methanol-to-olefins regeneration catalyst, specifically relating to a fixed temperature control jacket for a fixed fluidized bed reactor for pre-carbonization of C4 catalyst in methanol-to-olefins regeneration catalyst. Background Technology

[0002] The fixed fluidized bed reactor for pre-coking of regenerated catalyst is an experimental device for pre-coking the regenerated catalyst. C4 is stored in a buffer tank via a sampling cylinder, mixed thoroughly, and then enters the fixed fluidized bed reactor to react with the regenerated catalyst. The generated product gas is piped to a gas chromatograph for analysis. The outlet of the fixed fluidized bed reactor is connected to the gas chromatograph via a φ3 stainless steel pipe, the outer wall of which is typically wrapped with aluminum foil for insulation. During operational testing, it was found that flash evaporation and condensation were likely to occur during the C4's entry into the buffer tank via the sampling cylinder. Furthermore, the insulation method of wrapping the constant-temperature electric heating belt around the φ3 stainless steel pipe and then using aluminum foil in the final tail gas analysis stage easily caused uneven heating of the product gas delivery pipe, creating localized hot spots that affected the component distribution of the product gas entering the gas chromatograph, leading to inaccurate measurements. Additionally, conventional industrial constant-temperature jackets are not suitable for φ3 stainless steel pipes, and the aluminum foil-wrapped constant-temperature electric heating belt frequently suffers from broken heating wires and frequent aluminum foil replacements in the later stages of use. To address the issues of uneven gasification during C4 transport, uneven heating of the product gas transport pipe, breakage of the heating wire in the constant-temperature electric heating belt, and frequent replacement of aluminum foil, this invention proposes a fixed constant-temperature sleeve for C4 in a fixed fluidized bed reactor with pre-carbon deposition of methanol-to-olefins regeneration catalyst. Utility Model Content

[0003] This invention proposes a fixed temperature control jacket for a fixed fluidized bed reactor with pre-carbonized C4 catalyst in methanol-to-olefins regeneration.

[0004] The fixed temperature jacket is an important insulation device for the feed gas / product gas conveying pipeline and a crucial component of the fixed fluidized bed reactor for regenerating catalyst pre-coking. For example... Figure 1 As shown, the pre-coking fixed fluidized bed reactor for regenerated catalyst consists of a C4 delivery system, a reaction system, and a product gas delivery and analysis system. The C4 delivery system mainly comprises a C4 sampling cylinder, a feed gas delivery pipe, and a buffer tank. The reaction system consists of a fixed fluidized bed temperature control device and a reactor. The product gas delivery and analysis system consists of a product gas delivery pipe and a gas chromatograph. In the feed gas / product gas delivery pipe (… Figure 1The outer surface of the part indicated by the dashed box is wrapped with the fixed thermostatic sleeve described in this utility model. This fixed thermostatic sleeve effectively solves the problems of condensation in raw material gas, uneven heating of product gas conveying pipe, easy breakage of electric heating wire in thermostatic electric heating belt, and frequent replacement of aluminum foil paper of thermostatic electric heating belt in the raw material gas and product gas conveying and analysis system. It is beneficial to the uniform entry of raw material gas components into the reactor and the subsequent online collection and analysis of product gas.

[0005] like Figure 2 As shown, the present invention discloses a fixed temperature control sleeve for a C4-based fixed fluidized bed reactor for pre-coking of catalysts in methanol-to-olefins regeneration. The sleeve comprises a body, a constant-temperature electric heating belt, a thermally conductive silicone sheet, a temperature sensor, and a temperature controller. The body is constructed of a ring-shaped insulating material of a certain thickness. A fixed zipper, aligned with the direction of the feed gas / product gas delivery pipe, is embedded in the body for easy replacement of the thermally conductive silicone sheet and the heating belt. The thermally conductive silicone sheet is a ring-shaped structure of a certain thickness and is located inside the body. The heating belt is a strip structure, single-layered spirally wound inside the thermally conductive silicone sheet (without gaps between adjacent heating belts, ensuring uniform heating of the entire temperature control sleeve). Figure 2 The gaps between the constant temperature electric heating strips are for visual demonstration of their winding method. The raw material gas / product gas delivery pipe is inserted into the internal space formed by the thermally conductive silicone sheet and the constant temperature electric heating strip. The constant temperature electric heating strip, thermally conductive silicone sheet, and constant temperature sleeve body are tightly wrapped around the outer surface of the raw material gas / product gas delivery pipe. The temperature sensor is embedded in the inner side of the constant temperature sleeve body near the gas inlet, and the temperature controller is installed on the outer side of the bottom of the constant temperature sleeve body. The temperature controller integrates temperature control and temperature display. The constant temperature electric heating strip, temperature sensor, and temperature controller are connected. The temperature controller is connected to an external power supply via a power switch.

[0006] Furthermore, the constant temperature electric heating belt is sewn inside the annular thermally conductive silicone sheet with flame-retardant sewing thread in its winding direction.

[0007] Furthermore, the temperature controller adjusts the internal temperature of the thermostatic jacket body to 150-200℃ via a thermostatic electric heating belt.

[0008] Furthermore, the material of the constant temperature jacket body can be aluminum silicate, silicone cloth, rock wool, aerogel, and glass wool, etc.; the constant temperature electric heating belt is mainly composed of electric heating material and insulating material, etc. The electric heating material is a nickel-chromium alloy strip, which has the characteristics of fast heating speed, high thermal efficiency and long service life. The insulating material is multi-layer alkali-free glass fiber, which has good temperature resistance and reliable insulation performance. The constant temperature electric heating belt involved in this utility model is a common consumable in the chemical industry and can be purchased directly from Zibo Yunjing Electric Technology Co., Ltd.; the material of the thermally conductive silicone sheet is organic silicone resin, and the raw material gas conveying pipe and the product gas conveying pipe are φ3 stainless steel pipes.

[0009] Compared with the prior art, the advantages of this utility model are as follows:

[0010] (1) The constant temperature electric heating belt is sewn inside the heat-conducting silicone sheet and does not need to be wrapped around the φ3 stainless steel tube, so that the raw material gas conveying pipe and the product gas conveying pipe are heated evenly, avoiding the occurrence of local hot spots and ensuring the constant temperature and uniformity of the C4 raw material gas / product gas conveying pipe.

[0011] (2) The fixed thermostatic jacket is equipped with a temperature controller and a fixed zipper, which makes the internal temperature of the fixed thermostatic jacket flexible and adjustable, and easy to disassemble and replace the heat-conducting silicone sheet and the thermostatic electric heating belt. It is highly operable. The temperature detected by the temperature sensor is displayed in real time through the display screen, which makes it convenient for operators to understand and record the internal temperature of the thermostatic jacket in real time.

[0012] (3) The fixed thermostatic sleeve of this utility model solves the problem that the traditional industrial thermostatic sleeve cannot match the size of φ3 stainless steel pipe, and can be widely used in a wide range. Attached Figure Description

[0013] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of a fixed fluidized bed reactor for pre-coking of regenerated catalysts;

[0015] Figure 2 This is a cross-sectional view of the fixed thermostatic sleeve described in this utility model.

[0016] Figure 2 The names of the various parts are as follows: 1. Raw material gas / product gas conveying pipe, 2. Constant temperature jacket body, 3. Constant temperature electric heating belt, 4. Thermal conductive silicone sheet, 5. Fixed zipper, 6. Temperature sensor, 7. Temperature controller.

[0017] The function of the raw material gas / product gas delivery pipe 1 is to transport the raw material gas into the buffer tank and the product gas into the gas chromatograph; the function of the constant temperature jacket body 2 is to keep the raw material gas / product gas delivery pipe 1 at a constant temperature to prevent condensation from entering the chromatograph due to excessively low temperature, which would lead to inaccurate analytical results; the function of the constant temperature electric heating belt 3 is to keep the constant temperature jacket body 2 constant; the function of the thermally conductive silicone sheet 4 is to reduce the contact thermal resistance between the heat source surface and the heat dissipation device, effectively fill the gap of the contact surface, squeeze out the air from the contact surface, thereby achieving the lowest contact thermal resistance, reducing temperature differences, and effectively isolating current to prevent short circuits; at the same time, it also has the functions of shock absorption and sealing, and can play a protective and stabilizing role in the equipment; the function of the temperature sensor 6 is to monitor the temperature of the constant temperature electric heating belt 3 regulated by the temperature controller 7 and convert it into an output signal; the function of the temperature controller 7 is to control the temperature fluctuation of the constant temperature electric heating belt 3, and can set the temperature within the constant temperature range and display the corresponding temperature. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1

[0020] like Figure 1 As shown in the dashed box, there are two parts of the pipeline that require the fixed temperature control sleeve described in this utility model for protection: one is the pipeline from the sampling cylinder outlet to the buffer tank; the other is the pipeline from the reactor outlet to the gas chromatograph.

[0021] like Figure 2As shown, a fixed temperature control sleeve for a pre-coking fixed fluidized bed reactor for regenerated catalysts comprises a temperature control sleeve body 2, a temperature control electric heating belt 3, a thermally conductive silicone sheet 4, a temperature sensor 6, and a temperature controller 7. The temperature control sleeve body 2 is made of annular insulation material of a certain thickness, and a fixed zipper 5 aligned with the direction of the feed gas / product gas delivery pipe 1 is embedded in the outer surface of the temperature control sleeve body 2. The thermally conductive silicone sheet 4 is annular in structure of a certain thickness and is disposed inside the temperature control sleeve body 2. The temperature control electric heating belt 3 is a strip structure, with a single-layer spiral wound stitching. Inside the thermally conductive silicone sheet 4, the raw material gas / product gas delivery pipe 1 is inserted into the internal space formed by the thermally conductive silicone sheet 4 and the constant temperature electric heating belt 3. The fixed zipper 5 facilitates the replacement of the thermally conductive silicone sheet 4 and the constant temperature electric heating belt 3. The temperature sensor 6 is embedded and installed on the inner side of the constant temperature jacket body 2 near the gas inlet. The temperature controller 7 is installed on the outer side of the bottom end of the constant temperature jacket body 2. The temperature controller 7 integrates temperature control and temperature display. The constant temperature electric heating belt 3, the temperature sensor 6 and the temperature controller 7 are connected. The temperature controller 7 is connected to an external power supply through a power switch.

[0022] The constant-temperature electric heating belt 3 creates a uniformly heated heat-conducting layer inside the fixed constant-temperature sleeve 2. The temperature controller 7 is model MTC-5060C, and the temperature sensor 6 is model WRNK-161. This fixed constant-temperature sleeve, through the coordinated operation of the constant-temperature electric heating belt 3 and the temperature controller 7, controls the internal temperature of the sleeve within the range of 150–200℃, and displays the specific value on the temperature controller 7, preventing excessively high or low temperatures from adversely affecting the quality of the product gas.

[0023] The length of the raw material gas delivery pipe is 100cm, the length of the product gas delivery pipe is 270cm, the length of the constant temperature jacket body 2 wrapped around the raw material gas delivery pipe is 105cm, and the length of the constant temperature jacket body 2 wrapped around the product gas delivery pipe is 275cm; the outer diameter of the constant temperature jacket body 2 is 11mm, the thickness of the constant temperature jacket body 2 is 2mm, the thickness of the thermally conductive silicone sheet 4 is 0.5mm, the thickness of the constant temperature electric heating belt 3 is 1mm, and the outer diameter of the raw material gas / product gas delivery pipe 1 is 4mm; the lengths of the constant temperature electric heating belt 3 wrapped around the raw material gas / product gas delivery pipe 1 are 180cm and 350cm respectively, and the width of the constant temperature electric heating belt 3 is 3cm.

[0024] Example 2

[0025] The specific workflow of this utility model is as follows:

[0026] Mixed C4 gas collected from industrial facilities is stored in C4 sampling cylinders. The cylinders are fed into a buffer tank via a feed gas delivery pipe, and then into a reactor via the same pipe. The C4 components from the buffer tank serve as the feed gas in the reactor, which is filled with a regenerated catalyst. The C4 components react with the regenerated catalyst to generate product gas. The product gas is then filtered to remove oily and waxy substances before being sent to a gas chromatograph for analysis and characterization. The pre-carbonization reaction of the regenerated catalyst mainly consists of three stages: catalyst activation, the formal reaction, and product gas analysis. Nitrogen gas is introduced during the catalyst activation stage. In the formal reaction stage, both the feed gas and product gas delivery pipes (1) are φ3 stainless steel pipes. Figure 1 The outer wall at the location indicated by the dashed box is enclosed by the working thermostatic sleeve body 2 to ensure that the gas does not condense during the flow process.

[0027] All aspects not detailed in this utility model are conventional technical means known to those skilled in the art. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fixed temperature control jacket for a fixed fluidized bed reactor for pre-coking of C4 catalysts in methanol-to-olefins regeneration, characterized in that: The system consists of a constant temperature jacket body (2), a constant temperature electric heating belt (3), a thermally conductive silicone sheet (4), a temperature sensor (6), and a temperature controller (7). The constant temperature jacket body (2) is made of annular insulation material with a certain thickness. A fixed zipper (5) aligned with the direction of the raw material gas / product gas delivery pipe (1) is embedded in the constant temperature jacket body (2). The thermally conductive silicone sheet (4) is annular in structure with a certain thickness and is located inside the constant temperature jacket body (2). The constant temperature electric heating belt (3) is a strip structure, with a single layer spirally wound inside the thermally conductive silicone sheet (4). The raw material gas / product gas delivery pipe (1) is inserted into the... In the internal space formed by the thermally conductive silicone sheet (4) and the constant temperature electric heating belt (3), the constant temperature electric heating belt (3), the thermally conductive silicone sheet (4) and the constant temperature sleeve body (2) are tightly wrapped around the outer surface of the raw material gas / product gas conveying pipe (1); the temperature sensor (6) is embedded in the inner side of the constant temperature sleeve body (2) near the gas inlet, and the temperature controller (7) is installed on the outer side of the bottom end of the constant temperature sleeve body (2). The temperature controller (7) integrates temperature control and temperature display. The constant temperature electric heating belt (3), the temperature sensor (6) and the temperature controller (7) are connected. The temperature controller (7) is connected to the external power supply through the power switch.

2. The fixed temperature control jacket for a fixed fluidized bed reactor for pre-coking of C4 catalyst in methanol-to-olefins regeneration as described in claim 1, characterized in that: The constant temperature electric heating belt (3) is sewn inside the annular thermally conductive silicone sheet (4) with flame-retardant sewing thread in its winding direction.

3. The fixed temperature control jacket for a fixed fluidized bed reactor for pre-coking of C4 catalyst in methanol-to-olefins regeneration as described in claim 1, characterized in that: The temperature controller (7) adjusts the internal temperature of the thermostatic jacket body (2) to 150-200℃ via the thermostatic electric heating belt (3).

4. The fixed temperature control jacket for a fixed fluidized bed reactor for pre-coking of C4 catalyst in methanol-to-olefins regeneration as described in claim 1, characterized in that: The material of the constant temperature jacket body (2) is aluminum silicate, silicone cloth, rock wool, aerogel or glass wool; the constant temperature electric heating belt (3) is composed of electric heating material and insulating and heat-insulating material. The electric heating material is nickel-chromium alloy belt and the insulating material is multi-layer alkali-free glass fiber; the material of the thermal conductive silicone sheet (4) is organic silicone resin; the raw material gas / product gas conveying pipe is φ3 stainless steel pipe.

5. A fixed temperature control jacket for a fixed fluidized bed reactor for pre-coking of C4 catalysts in methanol-to-olefins regeneration, as described in claim 1, characterized in that: The outer diameter of the thermostatic jacket body (2) is 11mm and the thickness is 2mm; the thickness of the thermally conductive silicone sheet (4) is 0.5mm; the thickness of the thermostatic electric heating belt (3) is 1mm; the outer diameter of the raw material gas / product gas conveying pipe (1) is 4mm; and the width of the thermostatic electric heating belt (3) is 3cm.

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