CN215196855U - Multi-tube reactor for activity test of methanol synthesis catalyst - Google Patents
Multi-tube reactor for activity test of methanol synthesis catalyst Download PDFInfo
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- CN215196855U CN215196855U CN202121389058.1U CN202121389058U CN215196855U CN 215196855 U CN215196855 U CN 215196855U CN 202121389058 U CN202121389058 U CN 202121389058U CN 215196855 U CN215196855 U CN 215196855U
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Abstract
The utility model provides a multitube reactor for methanol synthesis catalyst activity test, includes shell, electric heater and heat preservation, and the heat preservation is arranged in between electric heater and the shell, its characterized in that: the electric heater comprises an electric furnace wire, an insulating material and a stainless steel cylinder, the electric furnace wire penetrates through the insulating material and is wound on the stainless steel cylinder, and a sealing body is arranged in the stainless steel cylinder; the sealing body comprises a central pipe, reaction pipes and a pressure-bearing heat accumulator, the central pipe is used as the center, the reaction pipes are uniformly distributed around the central pipe in a circular shape, and the reaction pipes are arranged in the pressure-bearing heat accumulator. The utility model has clear structure, reasonable layout, convenient operation and better stability; the unique design of the multiple reaction tubes can detect multiple samples at one time under the same condition, can effectively ensure that the temperature and the pressure between the reaction tubes are kept consistent, provides guarantee for the timeliness of the sample inspection of the methanol synthesis catalyst, greatly improves the working efficiency, and reduces the waste of heat and feed gas.
Description
Technical Field
The invention relates to a multi-tube reactor for testing the activity of a methanol synthesis catalyst, which is mainly applied to the activity test and performance evaluation of the methanol synthesis catalyst.
Background
The methanol synthesis reactor is one of key devices for methanol synthesis production, and the methanol synthesis reactor with excellent performance plays a key role in improving the yield of methanol, reducing the energy consumption of a system and the like.
The reactor is roughly divided into three types of towers, namely a continuous heat exchange type tower, a multi-section indirect heat exchange type tower and a multi-section cold shock type tower. Regardless of the type of the tower, the requirements for the methanol synthesis tower in the process are consistent, and the main requirements are as follows: the gas is uniformly distributed in the catalyst bed layer, and the pressure drop of the tower is small; the temperature distribution of the catalyst bed layer is reasonable, and the activity of the catalyst is fully utilized; the high-pressure container has high space utilization rate: the production is stable, the adjustment is flexible, and the operation flexibility is high; simple and reliable structure, reasonable connection and heat preservation of all parts, free telescopic scope of the internal parts in the tower to reduce thermal stress and the like.
A methanol synthesis reactor with good performance has great significance for the production of methanol synthesis, and in industry, the methanol synthesis tower has more types, such as a cold pipe cooling type (single pipe parallel flow, double sleeves, three sleeves and the like), a cold shock type, an intermediate heat exchange type and the like.
The development of the cold tube cooling type methanol synthesis tower is earlier, along with the successful development of a novel methanol synthesis tower (a multilayer cold shock type, an intermediate heat exchange type and an axial direction), the traditional cold tube cooling type synthesis tower is gradually eliminated, the existing large-scale reaction tower is mainly used for large-scale industrial synthesis, and the cold tube cooling type methanol synthesis tower is characterized by a large reactor, large catalyst loading capacity and high capacity, and the design of the reactor is based on the scale and is not suitable for being used as a laboratory reactor to evaluate the excellent catalyst activity.
Disclosure of Invention
The invention mainly solves the problem of evaluating the activity of a methanol synthesis catalyst, provides a small-sized multi-tube reactor for testing the activity of the methanol synthesis catalyst, and tests by simulating the industrial process of methanol synthesis and controlling conditions such as reaction temperature, airspeed, pressure and the like similar to a factory so as to obtain the test data of the activity of the catalyst.
The multitube reactor provided by the invention has the advantages of small volume, long feed gas preheating path, sufficient preheating, convenience in loading and unloading of the catalyst, small bed resistance and the like. The flow of gas in the bed layer is close to the plug flow, so the range of controlling the space velocity of the raw material gas is large. The novel design can complete the inspection of a plurality of samples at most once under the same condition, greatly saves the inspection cost and improves the working efficiency.
The technical solution of the invention is as follows: a multitube reactor for methyl alcohol synthesis catalyst activity test, including shell, electric heater and heat preservation, the heat preservation is arranged in between electric heater and the shell, its characterized in that: the electric heater comprises an electric furnace wire, an insulating material and a stainless steel cylinder, the electric furnace wire penetrates through the insulating material and is wound on the stainless steel cylinder, and a sealing body is arranged in the stainless steel cylinder; the sealing body comprises a central pipe, reaction pipes and a pressure-bearing heat accumulator, the central pipe is used as the center, the reaction pipes are uniformly distributed around the central pipe in a circular shape, and the reaction pipes are arranged in the pressure-bearing heat accumulator.
Generally, the upper part of the central tube is connected with a three-way joint, one end of the three-way joint is an air inlet, the other end of the three-way joint is connected with a thermocouple sleeve, and a temperature thermocouple is inserted in the three-way joint.
The number of the reaction tubes is 2-6, and the gas outlet is positioned at the upper part of the reaction tubes.
The central tube and the reaction tube are connected with the pressure-bearing heat accumulator by linear conical sealing surfaces through nuts.
The central tube, the reaction tube and the pressure-bearing heat accumulator are made of 316L special alloy steel, and the screw cap is made of chromium-molybdenum steel.
The insulating material is a bowl-shaped ceramic ring.
The pressure resistance of the reaction tube is less than or equal to 20MPa, and the temperature resistance is less than or equal to 600 ℃.
The diameter of the pressure-bearing heat accumulator is 110-150 mm.
The thickness of the heat preservation layer is 10-20 cm.
The heat insulation material of the heat insulation layer is one of 20-40 meshes of vermiculite powder, pearl expansion powder and heat insulation cotton.
The invention has the advantages that:
(1) the structure is clear, the layout is reasonable, the operation is convenient, and the stability is better;
(2) the pipeline connection adopts a stainless steel pipe, so that the sealing performance is good; the temperature control system can be matched with an intelligent high-precision instrument temperature control system to carry out program precise temperature control, and the temperature difference is less than or equal to 1 ℃ when the temperature is constant;
(3) the airspeed range of the raw material gas is controlled to be large, the accuracy is high, and the selection of the activity test condition of the catalyst and the accuracy of test data are facilitated;
(4) the device has the advantages of small volume, long raw material gas preheating path, full preheating and small bed resistance;
(5) the reaction tube is made of 316L special alloy steel, has good heat resistance and heat conductivity, and is more beneficial to axial temperature balance in the reaction tube;
(6) the central tube and the reaction tube are connected with the pressure-bearing heat accumulator by adopting linear conical sealing surfaces through nuts, so that the air tightness is good;
(7) the unique design of the multiple reaction tubes can detect multiple samples at one time under the same condition, can effectively ensure that the temperature and the pressure between the reaction tubes are kept consistent, provides guarantee for the timeliness of the sample inspection of the methanol synthesis catalyst, greatly improves the working efficiency, and reduces the waste of heat and feed gas.
Drawings
Fig. 1 is a schematic sectional structure view of a multitubular reactor for activity test of a methanol synthesis catalyst according to an embodiment of the present invention.
Fig. 2 is a schematic top view of the embodiment.
In the figure, 1 — base; 2-bowl-shaped ceramic ring; 3, electric furnace wire; 4, a shell; 5-a pressure-bearing heat accumulator; 6-central tube; 7-thermowell; 8-an air inlet; 9-air outlet; 10-a reaction tube; 11-insulating layer.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Examples
The embodiment is a multitube reactor for activity test of a methanol synthesis catalyst, which mainly comprises a sealing body, an electric heating body, a heat preservation layer 11, a shell 4 and a base 1, wherein the heat preservation layer 11 is positioned between the electric heating body and the shell 4, and the base 1 is fixed on the ground through a support.
In the embodiment, the electric heating body comprises an electric furnace wire 3, a bowl-shaped ceramic ring 2 and a stainless steel cylinder, the electric furnace wire 3 penetrates through the bowl-shaped ceramic ring 2 and is wound on the stainless steel cylinder, so that the electric furnace wire is fully insulated from the cylinder, the temperature control system of the intelligent high-precision instrument can be used for program temperature control, and the temperature difference when the temperature is controlled to be constant is smaller than or equal to 1 ℃.
In the embodiment, the sealing body is arranged in a stainless steel cylinder and comprises a central pipe 6, a reaction pipe 10 and a pressure-bearing heat accumulator 5, wherein the central pipe 6 is positioned in the middle of the pressure-bearing heat accumulator 5, the upper part of the central pipe is connected with a three-way joint, one end of the three-way joint is an air inlet 8, the other end of the three-way joint is connected with a thermocouple sleeve 7, and a temperature-measuring thermocouple is inserted in the three-way joint; 4 reaction tubes 10 are uniformly arranged around the central tube 6 in a circular shape, and the gas outlet 9 is positioned at the upper part of the reaction tubes 10 and is connected with an analysis system of the inspection device; the central tube 6 and the reaction tube 10 are connected with the pressure-bearing heat accumulator 5 by adopting linear conical sealing surfaces through nuts.
In the embodiment, the central tube 6, the reaction tube 10 and the pressure-bearing heat accumulator 5 are in high temperature and high pressure and are in corrosive environments such as carbon monoxide, carbon dioxide, hydrogen and the like, the material is corrosion-resistant, heat-resistant and high-strength 316L special alloy steel, the nut is chromium-molybdenum steel, and the shell 4 is 304 stainless steel, so that the nut and the tower body are not easy to seize.
In the embodiment, the diameter of the pressure-bearing heat accumulator is 128mm, the thickness of the heat-insulating layer is about 10cm, the pressure of the reaction tube is 10MPa, the reaction temperature is 600 ℃, and (20-40) mesh high-temperature-resistant vermiculite powder is filled, so that the temperature stability of the multi-tube reactor is ensured, and the temperature loss caused by the temperature difference of the environment is reduced.
In the example, the length of the thermowell built in the central tube 6 was 600 mm. When the catalyst is filled, firstly, a layer of fine copper mesh is padded at the bottom of the reaction tube, then, quartz sand with the granularity of (1.0 mm-1.4 mm) is filled in the reaction tube and tamped, the reaction tube is filled with the catalyst with the granularity of (0.425 mm-1.18 mm) and tamped, the reaction tube is filled with the catalyst with the granularity of (1.0 mm-1.4 mm) and tamped, the quartz sand is filled in the reaction tube and tamped, then, the seal head is sealed, and the seal head nut is screwed down to connect the system. Holes of phi 1 mm are uniformly distributed on screw caps at the lower ends of the reaction tubes, so that the feed gas can conveniently enter the catalyst bed layer for reaction, and simultaneously, the quartz sand is prevented from flowing out.
The reaction principle is as follows: carbon monoxide, carbon dioxide and hydrogen in the raw material gas are subjected to chemical reaction under the action of a methanol synthesis catalyst under specific conditions to generate methanol, and the chemical reaction equation is as follows.
CO + 2H2 = CH3OH
CO2 + 3H2 = CH3OH + H2O。
For the high-pressure methanol catalyst, the carbon monoxide conversion rate is calculated by measuring the volume fraction of carbon monoxide in gas before and after reaction, so that the activity of the catalyst is represented; for the low-pressure methanol catalyst, the methanol space-time yield is calculated by measuring the generation quality of methanol in a certain time, so as to characterize the activity of the catalyst.
This embodiment is not described and is well known in the art.
Claims (10)
1. The utility model provides a multitube reactor for methanol synthesis catalyst activity test, includes shell, electric heater and heat preservation, and the heat preservation is arranged in between electric heater and the shell, its characterized in that: the electric heater comprises an electric furnace wire, an insulating material and a stainless steel cylinder, the electric furnace wire penetrates through the insulating material and is wound on the stainless steel cylinder, and a sealing body is arranged in the stainless steel cylinder; the sealing body comprises a central pipe, reaction pipes and a pressure-bearing heat accumulator, the central pipe is used as the center, the reaction pipes are uniformly distributed around the central pipe in a circular shape, and the reaction pipes are arranged in the pressure-bearing heat accumulator.
2. The multitube reactor for methanol synthesis catalyst activity test according to claim 1, characterized in that: the upper part of the central pipe is connected with a three-way joint, one end of the three-way joint is an air inlet, the other end of the three-way joint is connected with a thermocouple sleeve, and a temperature measuring thermocouple is inserted in the thermocouple sleeve.
3. The multitube reactor for methanol synthesis catalyst activity test according to claim 1, characterized in that: the number of the reaction tubes is 2-6, and the gas outlet is positioned at the upper part of the reaction tubes.
4. The multitube reactor for methanol synthesis catalyst activity test according to claim 1, characterized in that: the central tube and the reaction tube are connected with the pressure-bearing heat accumulator by linear conical sealing surfaces through nuts.
5. The multitube reactor for methanol synthesis catalyst activity test according to claim 1 or 4, characterized in that: the central tube, the reaction tube and the pressure-bearing heat accumulator are made of 316L special alloy steel, and the screw cap is made of chromium-molybdenum steel.
6. The multitube reactor for methanol synthesis catalyst activity test according to claim 1, characterized in that: the insulating material is a bowl-shaped ceramic ring.
7. The multitube reactor for methanol synthesis catalyst activity test according to claim 1, characterized in that: the pressure resistance of the reaction tube is less than or equal to 20MPa, and the temperature resistance is less than or equal to 600 ℃.
8. The multitube reactor for methanol synthesis catalyst activity test according to claim 1, characterized in that: the diameter of the pressure-bearing heat accumulator is 110-150 mm.
9. The multitube reactor for methanol synthesis catalyst activity test according to claim 1, characterized in that: the thickness of the heat preservation layer is 10-20 cm.
10. The multitube reactor for methanol synthesis catalyst activity test according to claim 1 or 9, characterized in that: the heat insulation material of the heat insulation layer is one of 20-40 meshes of vermiculite powder, pearl expansion powder and heat insulation cotton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121389058.1U CN215196855U (en) | 2021-06-22 | 2021-06-22 | Multi-tube reactor for activity test of methanol synthesis catalyst |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121389058.1U CN215196855U (en) | 2021-06-22 | 2021-06-22 | Multi-tube reactor for activity test of methanol synthesis catalyst |
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| Publication Number | Publication Date |
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| CN215196855U true CN215196855U (en) | 2021-12-17 |
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| CN202121389058.1U Active CN215196855U (en) | 2021-06-22 | 2021-06-22 | Multi-tube reactor for activity test of methanol synthesis catalyst |
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2021
- 2021-06-22 CN CN202121389058.1U patent/CN215196855U/en active Active
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Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: SINOPEC NANJING CHEMICAL RESEARCH INSTITUTE Co.,Ltd. Patentee after: SINOPEC NANJING CHEMICAL IND Co.,Ltd. Address before: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee before: SINOPEC NANJING CHEMICAL RESEARCH INSTITUTE Co.,Ltd. Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: SINOPEC NANJING CHEMICAL IND Co.,Ltd. |