CN111322633A - Methanol vaporization mixer and methanol vaporization mixing method - Google Patents
Methanol vaporization mixer and methanol vaporization mixing method Download PDFInfo
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- CN111322633A CN111322633A CN202010342876.XA CN202010342876A CN111322633A CN 111322633 A CN111322633 A CN 111322633A CN 202010342876 A CN202010342876 A CN 202010342876A CN 111322633 A CN111322633 A CN 111322633A
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 807
- 238000002156 mixing Methods 0.000 title claims abstract description 64
- 230000008016 vaporization Effects 0.000 title claims abstract description 60
- 238000009834 vaporization Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 102
- 239000007789 gas Substances 0.000 claims abstract description 96
- 230000003197 catalytic effect Effects 0.000 claims abstract description 29
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000001301 oxygen Substances 0.000 claims abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 13
- 239000007921 spray Substances 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 15
- 230000003647 oxidation Effects 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 9
- 239000003054 catalyst Substances 0.000 abstract description 8
- 238000002309 gasification Methods 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 238000007084 catalytic combustion reaction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000004886 process control Methods 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- 238000004887 air purification Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- ODUCDPQEXGNKDN-UHFFFAOYSA-N Nitrogen oxide(NO) Natural products O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
- F23K5/22—Vaporising devices
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to a methanol vaporization mixer and a methanol vaporization mixing method. The methanol vaporization mixer is characterized in that a heat exchange tube filled with a catalyst is arranged in an air preheating chamber of the methanol vaporization mixer, air heated by the air preheating chamber is mixed with methanol for preheating, catalytic oxidation reaction is carried out in the heat exchange tube of the air preheating chamber, heat energy for heating the air is released, the heat exchange tube is a circular tube with the same diameter or variable diameter, and a necking structure is arranged in the area, close to a mixing and pressure equalizing chamber, of the middle gas conveying pipe. The methanol vaporization mixing method is characterized in that the air flow introduced into the air preheating chamber is controlled to meet the oxygen concentration requirement of the methanol mixed gas, and the heat release strength in the heat exchange tube is controlled by controlling the methanol flow for preheating to meet the temperature requirement of the methanol mixed gas. The methanol gasification device can realize the vaporization of methanol and the mixing with air without a new heating medium during the stable work to form the methanol mixed gas with a certain temperature, and has simple structure, convenient use and low operation cost.
Description
Technical Field
The invention relates to a methanol vaporization mixer and a methanol vaporization mixing method adopting the methanol vaporization mixer.
Background
Energy is the most important factor in human economic activities, the world is facing to various problems such as energy shortage, increasingly serious environmental pollution, greenhouse effect and the like, in order to protect the environment on which human beings depend and enable economy to be continuously developed, the development of clean new energy is urgent, and many developed countries tighten research and development on clean renewable energy methanol as future energy.
In the prior art, the methanol heating can adopt a flame combustion mode and a catalytic oxidation mode. Due to the flame combustion mode, insufficient combustion often exists and formaldehyde and Nitrogen Oxide (NO) are dischargedx) The problem of air pollutants is solved, and open flame combustion is prohibited under certain special occasions, so that, at least under certain conditions, the catalytic oxidation mode is a more feasible scheme, the mode not only has thorough reaction, but also has low operation temperature, and Nitrogen Oxides (NO) caused by high-temperature combustion can be effectively avoidedx) The method is an efficient and environment-friendly methanol heating mode.
However, the catalytic oxidation reaction has a strict requirement on the operating temperature, too low temperature cannot form an effective reaction, too high temperature can damage the catalyst, and methanol is in a liquid state at normal temperature, so that an effective solution is to vaporize methanol to mix with air before feeding methanol into the catalytic oxidation reactor, and heat the methanol mixed gas (mixed gas containing methanol and oxygen) to a proper temperature according to the operating temperature requirement of the catalytic oxidation reactor.
The conventional gas heating method generally uses a heat exchanger, such as a tubular heat exchanger, to heat the gas with a heat medium such as steam, however, introducing a new heat medium complicates the equipment and process, and requires certain conditions (e.g., industrial steam source).
Disclosure of Invention
To overcome the above-mentioned drawbacks of the prior art, the present invention provides a methanol vaporizing mixer to vaporize methanol and mix it with air to form a methanol mixed gas having a certain temperature without introducing a new heating medium.
The technical scheme of the invention is as follows: the methanol vaporization mixer is provided with a vertical shell, a tube array and a tube plate are arranged in the shell, the tube plate comprises an upper tube plate and a lower tube plate, the upper tube plate and the lower tube plate are horizontally arranged and are respectively and fixedly arranged at the upper part and the lower part of the shell, the outer edges of the upper tube plate and the lower tube plate are sealed with the shell, the space in the shell is divided into a mixing pressure equalizing chamber, an air preheating chamber and a vaporization mixing chamber which are sequentially distributed from top to bottom, the tube array consists of a plurality of heat exchange tubes, the upper ends and the lower ends of the heat exchange tubes are respectively and fixedly connected to the upper tube plate and the lower tube plate, the outer walls of the heat exchange tubes are sealed with the upper tube plate and the lower tube plate, tube holes are communicated with corresponding plate holes of the upper tube plate and the lower tube plate into a whole, the air preheating chamber is provided, the air outlet of the air preheating chamber is connected with the preheating mixed gas inlet of the mixing pressure equalizing chamber through an intermediate gas pipe, the intermediate gas pipe is provided with a preheating methanol inlet or the mixing pressure equalizing chamber is provided with a preheating methanol inlet, and the vaporization mixing chamber is provided with a heating methanol inlet and a methanol mixed gas outlet.
Preferably, the air outlet of the air preheating chamber is arranged at the upper part of the air preheating chamber, and the air inlet is arranged at the lower part of the air preheating chamber.
Preferably, the upper part of the vaporization mixing chamber is provided with a methanol spray pipe, the methanol spray pipe is provided with a nozzle or a spray hole, and the inner end of the heating methanol inlet is communicated with the methanol spray pipe.
Preferably, the heat exchange tube is a circular tube (the cross section of the tube is circular) with the same diameter or variable diameter.
Preferably, the heat exchange tube is a variable diameter circular tube with a wave-shaped vertical section of the tube wall, that is, the tube wall is in a rotating curved surface shape taking a wave-shaped curve as a bus, the inner diameter of the tube wall periodically changes along the axial direction, and the change rules in the upper direction and the lower direction are the same.
Preferably, the heat exchange tubes have equal tube diameters at the same height, so that the distances between adjacent heat exchange tubes at different heights are variable.
Preferably, the preheated mixture inlet of the mixing and pressure equalizing chamber is located at the top thereof.
Preferably, a necking structure is arranged in the area, close to the mixing and pressure equalizing chamber, of the middle gas conveying pipe, and the preheating methanol inlet is arranged on the side wall of the position, where the pipe diameter of the necking structure is the smallest, of the middle gas conveying pipe.
Preferably, an air circulation pipeline is arranged between the methanol mixed gas outlet and the air inlet, a heating device is connected to the air circulation pipeline in series, the methanol mixed gas outlet is connected with the inlet of the heating device through a corresponding air circulation pipeline, and the outlet of the heating device is connected with the air inlet of the air preheating chamber through a corresponding air circulation pipeline.
The heating device may be an electric heater in order to simplify the supporting facilities.
The air circulation pipe may be provided with a circulation pump in general.
The connection of the heating device to the relevant pipes can be realized by means of a tee according to the prior art.
A methanol vaporization mixing method is characterized in that any methanol vaporization mixer of the invention is adopted, methanol mixed gas for preheating containing methanol and oxygen is introduced into a heat exchange tube through a mixing pressure equalizing chamber to carry out catalytic oxidation reaction of the methanol, air is introduced into an air preheating chamber through an air inlet to absorb heat energy released by the catalytic oxidation reaction of the methanol, liquid methanol for preheating is introduced into an intermediate gas pipe or a mixing pressure equalizing chamber through a methanol preheating inlet, the liquid methanol for heating is introduced into a vaporization mixing chamber through a methanol heating inlet and mixed with the heated air introduced from the air preheating chamber through an air outlet to form the methanol mixed gas for preheating, the liquid methanol for heating is introduced into the vaporization mixing chamber through a methanol heating inlet and mixed with the gas after catalytic oxidation sent into the vaporization mixing chamber through the heat exchange tube to form methanol mixed gas containing the methanol and the oxygen and sent into the vaporization mixing chamber through a methanol mixed gas outlet, the methanol concentration and/or the oxygen concentration in the methanol mixed gas are controlled by controlling the air flow introduced into the air preheating chamber through the air inlet and/or controlling the heating methanol flow introduced into the pressure equalizing mixing chamber through the heating methanol inlet, so that the methanol concentration and/or the oxygen concentration of the methanol mixed gas are met, and the heat release strength (heat release power) of the methanol catalytic oxidation reaction in the heat exchange tube is controlled by controlling the preheating methanol flow introduced into the intermediate gas pipe through the preheating methanol inlet or introduced into the mixing pressure equalizing chamber, so that the temperature requirement of the methanol mixed gas is met.
The methanol vaporization mixer can be started (or started) in any one of the following ways:
in the starting process, the air is heated to the required temperature by the heating device, under the condition that methanol for preheating and methanol for heating are not added (the preheating methanol inlet and the heating methanol inlet are closed), the heated air is continuously sent into the air preheating chamber through the air inlet, the methanol mixed gas outlet is opened for air discharge, after the air temperature in the air preheating chamber reaches the required temperature, the preheating methanol inlet is opened for introducing the methanol for preheating, the heating device is closed, the air is directly sent into the air inlet under the condition that the air is not heated by the heating device, after the methanol catalytic oxidation reaction working condition in the heat exchange pipe is stable, the heating methanol inlet is opened for introducing the methanol for heating, the methanol mixed gas with the proper temperature is obtained from the methanol mixed gas outlet, and the methanol mixed gas enters the normal working state.
Alternatively, the first and second electrodes may be,
in the starting process, under the condition that methanol for preheating and methanol for heating are not added (the methanol inlet for preheating and the methanol inlet for heating are closed), the air inlet and the methanol mixed gas outlet are opened, air circulation is carried out through the methanol mixed gas outlet and the air inlet, the circulating air is heated by the heating device, the temperature rise of primary heating reaches or is lower than the required temperature rise requirement (namely, the air from an air source reaches the required temperature requirement or does not reach the required temperature requirement after primary heating of the heating device), the air discharged from the methanol mixed gas outlet is used as the air inlet of the heating device, the air is re-sent into the air inlet after being heated by the heating device until the air temperature in the air preheating chamber reaches the required temperature, the methanol for preheating is introduced into the methanol inlet for preheating, the heating device is closed, and the air is directly sent into the air inlet under the condition that the methanol for preheating and the methanol for heating are not heated, after the methanol catalytic oxidation reaction condition in the heat exchange tube is stable, a heating methanol inlet is opened to introduce heating methanol, and a methanol mixed gas with a proper temperature is obtained from a methanol mixed gas outlet, so that the methanol mixed gas enters a normal working state.
The main process and the beneficial effects of the invention are as follows: all air is introduced into the space (shell side) outside the tube of the air preheating chamber according to the required flow rate to be heated, the heated air vaporizes liquid methanol (which can be called methanol for preheating) introduced from a methanol preheating inlet to form mixed gas, then the mixed gas enters the vaporization mixing chamber through a heat exchange tube (tube side) of the air preheating chamber, the liquid methanol introduced from a methanol heating inlet is vaporized and mixed, and methanol mixed gas suitable for being sent into a methanol catalytic oxidation reactor is formed and output. In the process of flowing through the heat exchange tube, the methanol for preheating and the oxygen are subjected to catalytic oxidation reaction (or called catalytic combustion) under the action of the catalyst, and the released heat energy is heated to the air in the outer space of the tube through the heat exchange tube. Under the condition that other process parameters are fixed, the heat release quantity in the heat exchange tube can be controlled by controlling the flow of the methanol for preheating (generally, the methanol for preheating can be completely reacted in the heat exchange tube by controlling the process parameters), and further, the temperature of the heated air and the temperature of the finally output methanol mixed gas can be controlled; the concentration of the methanol in the methanol mixed gas can be controlled by controlling the flow of the methanol for heating, so that the methanol mixed gas is suitable for the requirement of the catalytic oxidation reaction for heating the methanol.
Can carry out air heating when the start through electric heater unit etc. and carry out air heating when starting, air after will heating to the uniform temperature is sent into air intlet, in order to satisfy the temperature requirement of methanol catalytic oxidation in the start-up process, after normal operating, rely on the exothermic satisfying all heating demands of methanol catalytic oxidation in the heat transfer pipe, need not set up heating process or heating equipment in addition, because electric heater is efficient, high in use, and the air quantity that the start-up phase needs to heat is very little relatively, basically can not lead to the obvious rising of cost because of heating, and can also set up the circulation between methanol mixture export and air intlet if necessary, do not heat through electric heater unit to air circulation heating under the condition of preheating with methanol and heating with methanol in the start-up phase, in order to reduce the power requirement to electric heater unit, realize the simplification of equipment.
The invention takes the heat release of the methanol catalytic oxidation as the energy for the methanol vaporization and the gas heating temperature rise for heating, does not need to additionally arrange a heating device under the stable working state, is safe and reliable, avoids arranging a complicated heating system for the methanol vaporization and the mixed gas temperature rise, simplifies the equipment structure, facilitates the operation and the control and reduces the operation cost.
Drawings
FIG. 1 is a schematic diagram of a methanol vaporization mixer;
FIG. 2 is a schematic diagram of another embodiment of a methanol-heating reactor;
fig. 3 is a schematic view of a (partial) structure of a heat exchange tube for a methanol vaporization mixer.
Detailed Description
Referring to fig. 1, 2 and 3, the methanol vaporization mixer may generally adopt a vertical tubular heat exchanger structure, and is provided with a vertical shell 10, wherein a tube array and a tube plate are arranged in the shell, the tube plate comprises an upper tube plate 34 and a lower tube plate 36, the upper tube plate and the lower tube plate are both horizontally arranged and are respectively and fixedly mounted at the upper part and the lower part of the shell, the outer edge of the tube array is sealed with the shell to divide the space in the shell into a mixing pressure equalizing chamber 22, an air preheating chamber 24 and a vaporization mixing chamber 26 which are sequentially distributed from top to bottom, the tube array is composed of a plurality of heat exchange tubes 32, the upper ends and the lower ends of the heat exchange tubes are respectively and fixedly connected to the upper tube plate and the lower tube plate, the outer walls of the heat exchange tubes are respectively sealed with the upper tube plate and the lower tube plate, the tube holes of the heat exchange tubes are respectively connected with corresponding plate holes, the air inlet of the air preheating chamber is used for connecting an external air source (such as an air supply pipe for purifying air), the heat exchange pipe is internally filled with a catalyst 31 for catalytic oxidation of methanol, any suitable catalyst can be selected according to the prior art, the air outlet of the air preheating chamber is connected with a preheated mixed gas inlet 5 of the mixed pressure equalizing chamber through an intermediate air pipe 6, the intermediate air pipe can be usually positioned outside the shell so as to be conveniently arranged and avoid occupying the space in the shell, the intermediate air pipe or the mixed pressure equalizing chamber is provided with a preheated methanol inlet 3 for connecting a methanol supply pipe and introducing methanol for air preheating, the vaporization mixing chamber is provided with a heated methanol inlet 1 and a methanol mixed gas outlet 8, the heated methanol inlet is used for connecting the methanol supply pipe and introducing methanol for heating, and the methanol mixed gas outlet is used for connecting a methanol mixed gas conveying pipe, the methanol (air) mixed gas with a certain temperature is output.
The heat exchange tubes may be generally equally spaced throughout the heat exchange area within the air preheating chamber.
The heat exchange tubes are preferably arranged in a square or regular triangle manner to better adapt to lateral air inlet and outlet structures and optimize the contact between air and the heat exchange tubes.
Generally, the heat exchange tube can be a round tube (the cross section of the tube is a round surface) with equal diameter or variable diameter, so that the uniform distribution of airflow in the tube on the cross section is facilitated.
For example, the heat exchange tubes are arranged in a square shape, and the heat exchange tubes are preferably variable diameter round tubes (see fig. 3) with wave-shaped vertical sections of tube walls, and the inner diameters of the variable diameter round tubes change periodically along the axial direction, and the change rules in the upper direction and the lower direction are the same. In this case, the tube diameters of the respective heat exchange tubes at the same height are preferably equal, and therefore the distances of the adjacent heat exchange tubes at different heights are varied. The heat exchange tube structure and the distribution mode are favorable for increasing the surface area of the heat exchange tube and improving the heat exchange capacity, and the resistance change of the air preheating chamber to the air flow is small under the condition that the air flow is greatly changed, so that the system stability is favorable, the adaptive air flow (load) range can be effectively enlarged, and the capacity of resisting the impact of the air flow change is improved. In addition, when the air flow changes, the intensity of the catalytic oxidation reaction can be adjusted by adjusting the flow of the methanol for preheating, so that the heat release quantity is adapted to the heat exchange quantity requirement under the corresponding air flow. The design of the heat exchange tubes (including the catalyst) should be adapted to the corresponding adjustment to meet the maximum reaction strength requirement.
A support, perforated plate, and/or wire mesh, etc. for supporting the catalyst may be provided within the heat exchange tubes.
The catalyst may be in the form of blocks or granules, etc.
The air inlet and the air outlet of the air preheating compartment may be generally disposed at opposite sides of the air preheating compartment, with one (preferably air outlet) disposed at an upper portion of the air preheating compartment and one (preferably air inlet) disposed at a lower portion of the air preheating compartment, so as to achieve uniform distribution of air flow and ensure heating effect.
Also can locate the air preheating chamber both sides that air preheating chamber upper portion is relative with air outlet branch, and set up in the air preheating chamber and lie in vertical baffling baffle 35, air inlet and air outlet symmetric distribution are in baffling baffle's both sides, and baffling baffle's upper end is connected with the upper tube plate, leave the interval that constitutes airflow channel between lower extreme and the lower tube plate, and under baffling baffle's effect, the air current of air preheating chamber is the U-shaped on the whole, has prolonged the air current route of air preheating chamber, does benefit to and improves heat transfer ability.
The area of the middle gas conveying pipe close to the mixing pressure equalizing chamber is preferably provided with a necking structure (or a throat), the preheated methanol inlet is arranged on the side wall of the minimum pipe diameter position of the necking structure of the middle gas conveying pipe, the air flow rate at the necking position is accelerated, a negative pressure suction effect is formed on methanol, and the methanol is efficiently mixed in the suction process and the subsequent pipe diameter expansion process stage, so that the gas entering the mixing pressure equalizing chamber is in a good mixing state.
The preheated mixture inlet of the mixing and pressure equalizing chamber is preferably located at the top thereof. In this case, an air inlet baffle 28 is preferably disposed in the mixing and pressure equalizing chamber below the air inlet inner port (inner end opening of the preheated mixture inlet), the air inlet baffle is in a shape of a circular plate or an oblate cone (cone with a cone height much lower than the radius of the bottom surface), the plate surface (large surface) of the circular plate or the vertex of the oblate cone is opposite to the preheated mixture inlet of the mixing and pressure equalizing chamber, the diameter of the circular plate or the bottom diameter of the oblate cone is preferably 1.5-2.5 times of the inner diameter of the air inlet inner port of the mixing and pressure equalizing chamber, and the distance between the diameter of the circular plate or the bottom diameter of the oblate cone and the air inlet inner port of the mixing and pressure equalizing chamber is. Through the setting of the air inlet baffle, the air flow entering the mixing pressure equalizing chamber can be prevented from directly flowing to the heat exchange tubes located in the central area, the pressure equalizing effect of the mixing pressure equalizing chamber is favorably improved, and the flow of each heat exchange tube is favorably consistent.
Any suitable form of support may be used to support and mount the intake baffle.
The heating methanol inlet is preferably arranged on the upper side wall of the vaporizing mixing chamber.
The methanol mixed gas outlet is preferably arranged at the center of the bottom of the vaporizing and mixing chamber.
According to the prior art, control valves can be arranged on pipeline interfaces or pipelines such as an air inlet, an air outlet, an intermediate gas pipe, a preheated methanol inlet, a heated methanol inlet, a methanol mixed gas outlet and the like according to control requirements, and are used for carrying out corresponding flow or on-off control so as to meet technological requirements.
Each control valve can be an electric control electric valve or other valves suitable for automatic control so as to carry out automatic control, and can also be connected with a manual valve in series so as to carry out corresponding manual control when the automatic control fails, for example, corresponding pipelines are cut off.
According to the prior art, an online flow detector, a pressure detector and/or a temperature detector and the like can be arranged on pipeline interfaces or connecting pipelines of an air inlet, an air outlet, an intermediate gas pipe, a preheated methanol inlet, a heated methanol inlet, a methanol mixed gas outlet and the like according to control requirements, and are used for detecting relevant parameters of corresponding parts so as to meet the process control requirements.
Pressure detectors and/or temperature detectors and the like which are used for arranging relevant detection parts on line can be arranged in the mixing pressure equalizing chamber, the air preheating chamber and the vaporization mixing chamber and are used for detecting relevant parameters of the corresponding parts so as to meet the process control requirements.
The specific detection position and the detection parameter are set according to the control requirement, and any appropriate prior art can be adopted.
The various pipe interfaces and connecting pipes (e.g., air inlet, air outlet, intermediate gas pipe, preheated methanol inlet, heated methanol inlet, and methanol mixture outlet) may be in the form of short pipes or any other suitable form, and may be welded to the housing of the corresponding device or otherwise mounted to the corresponding housing.
The connection between any of the tubular structures may be by way of a flanged connection or other suitable connection.
The upper part of the vaporization mixing chamber is preferably provided with a methanol spray pipe 25, the methanol spray pipe is provided with a nozzle or a spray hole, and the heating methanol inlet is communicated with (connected with) the methanol spray pipe, so that the methanol entering from the heating methanol inlet is uniformly distributed in the vaporization mixing chamber through the methanol spray pipe.
The methanol spray pipe can be in a horizontal ring shape, and is coaxially arranged in the vaporization mixing chamber through a related bracket, and the nozzles or spray holes can be uniformly distributed on the pipe wall of the methanol spray pipe, and the openings of the nozzles or spray holes face downwards. The support for supporting or mounting the methanol shower may take any suitable form.
The number of the methanol spray pipes can be one or more. When a plurality of methanol spray pipes are arranged, the methanol spray pipes have different sizes and are coaxially (alternately arranged inside and outside) distributed on the same plane. The specific quantity can be set according to the cross section size of the corresponding part of the vaporization mixing chamber and specific process parameters so as to realize more uniform methanol distribution.
Generally, the body of the shell is cylindrical, and the upper end and the lower end of the shell are respectively provided with an upper seal head 12 and a lower seal head 14.
The upper pipe plate is preferably located at the connecting part of the main body of the shell and the upper end enclosure. The end face of the main body of the shell and the end face of the upper end enclosure, which are butted with each other, are provided with tongue-and-groove structures (annular step structures) which are matched with each other, and the outer edge of the upper tube plate is clamped between the main body of the shell and the tongue-and-groove structures of the upper end enclosure, which are butted with each other.
The lower tube plate is preferably located at a connecting part of the main body of the shell and the lower end enclosure, matched tongue-and-groove structures (annular step structures) are arranged on the end faces, butted with each other, of the main body of the shell and the lower end enclosure, and the outer edge of the lower tube plate is clamped between the main body of the shell and the tongue-and-groove structures, butted with each other, of the lower end enclosure.
Sealing gaskets can be arranged at the joint of the main body of the shell and the lower end enclosure and the joint of the shell and the upper end enclosure as required.
The size of upper head and low head can be set according to actual need for mixed surge chamber and vaporization mixing chamber all have suitable size, with realize good vaporization, mix and the pressure-equalizing effect, good even uniformity helps guaranteeing the uniformity of each heat exchange tube flow.
A housing support 18 or pedestal or the like may be provided below the housing for mounting and support of the housing in accordance with the prior art.
Referring to fig. 2, an independent heating device 40 may be provided to heat the air during the start-up (start-up) of the apparatus to meet the temperature requirement for stable operation of the system, and after mixing with the methanol for preheating, the formed methanol mixed gas for preheating has the temperature required for catalytic oxidation in the heat exchange tubes when entering the heat exchange tubes.
The heating means may typically be an electric heater.
The inlet 41 of the heating device can be connected with the methanol mixed gas outlet 8 through a tee joint, the outlet is connected with the air inlet 22 of the air preheating chamber through a tee joint, namely, the heating device is connected in series on an air circulation pipeline, one section 43 of the air circulation pipeline is used for connecting the inlet of the heating device with the methanol mixed gas outlet, the circulating air led out from the methanol mixed gas outlet is connected into the heating device, the other section 42 of the air circulation pipeline is used for connecting the outlet of the heating device with the air inlet of the air preheating chamber, and the circulating air heated by the heating device is sent into the air preheating chamber again. Through the cyclic heating, firstly, the temperature in the equipment can be gradually raised to a temperature state required by stable work, thermal shock is avoided, and secondly, a heating device with smaller function is allowed to be adopted, so that the equipment is simplified, and the matching requirement is reduced. The control of the air circulation and the switching between the start-up mode and the steady mode can be achieved by providing a circulation pump 44, valves, etc. according to the prior art.
The heating device 40 may also be used to directly heat the air to a desired temperature, in which case the air may not be circulated, but it is usually necessary to continue to introduce and discharge the heated air through a start-up process in order to ensure that a desired steady state is established in the apparatus.
The heating methanol inlet and the preheating methanol inlet of the methanol vaporization mixer can be connected with a methanol source (such as a methanol storage tank) through corresponding methanol input pipes, the air inlet of the air preheating chamber is connected with an air source (such as an air purification device) through an air input pipe, and the methanol mixed gas outlet is connected with the methanol mixed gas (mixed gas of methanol and air for catalytic combustion) inlet of a methanol catalytic combustion (catalytic oxidation) heating device through a methanol mixed gas conveying pipe, so that a methanol flameless heating system is formed.
The methanol vaporization mixer can be matched with any suitable heating equipment which heats in a methanol catalytic oxidation mode, and is used for providing methanol mixed gas with a suitable temperature for the equipment which heats in the methanol catalytic oxidation mode, wherein the content (concentration) of methanol in the methanol mixed gas and the proportion of the content of oxygen can be according to the process requirements of related heating equipment, and the oxygen is usually excessive, so that the reaction of all methanol is finished.
The working medium (working medium) of the heating equipment can be in any suitable form such as air, water or heat conducting oil.
Generally, the methanol for preheating is made to react basically completely in the heat exchange pipe of the air preheating chamber by process control and equipment design, and if necessary, the influence of the unreacted methanol in the air preheating on the flow rate of the methanol for preheating and the flow rate of the methanol for heating should be considered.
The air inlet of the methanol vaporization mixer can be connected with an air purification treatment device (such as an air filtering device) for introducing purified air, or can be directly communicated with an external atmospheric space, and the preheating methanol inlet and the heating methanol inlet are connected with a methanol source (such as a methanol storage tank) for introducing liquid methanol.
On-line detectors of valves and related process parameters (e.g. pressure, temperature and flow, etc.) can be provided on the respective connecting lines, depending on the actual requirements.
The terms "vertical" and the corresponding terms "horizontal", "upper", "lower", "top" and "bottom" used for defining the directions and relative positions of the present invention are used only for convenience of description, and correspond to the vertical state shown in the drawings, and are used for defining the relative positional relationship of the respective parts, and are not used for defining the actual use direction, except for other definite meanings.
The technical means disclosed by the invention can be combined arbitrarily to form a plurality of different technical schemes except for special description and the further limitation that one technical means is another technical means.
Claims (10)
1. The methanol vaporization mixer is provided with a vertical shell, a tube array and a tube plate are arranged in the shell, the tube plate comprises an upper tube plate and a lower tube plate, the upper tube plate and the lower tube plate are horizontally arranged and are respectively and fixedly arranged at the upper part and the lower part of the shell, the outer edges of the upper tube plate and the lower tube plate are sealed with the shell, the space in the shell is divided into a mixing pressure equalizing chamber, an air preheating chamber and a vaporization mixing chamber which are sequentially distributed from top to bottom, the tube array consists of a plurality of heat exchange tubes, the upper ends and the lower ends of the heat exchange tubes are respectively and fixedly connected to the upper tube plate and the lower tube plate, the outer walls of the heat exchange tubes are sealed with the upper tube plate and the lower tube plate, tube holes are communicated with corresponding plate holes of the upper tube plate and the lower tube plate into a whole, the air preheating chamber is provided with an air, the air outlet of the air preheating chamber is connected with the preheating mixed gas inlet of the mixing pressure equalizing chamber through an intermediate gas pipe, the intermediate gas pipe is provided with a preheating methanol inlet or the mixing pressure equalizing chamber is provided with a preheating methanol inlet, and the vaporization mixing chamber is provided with a heating methanol inlet and a methanol mixed gas outlet.
2. The methanol vaporization mixer of claim 1, wherein the air outlet of the air preheating chamber is provided at an upper portion of the air preheating chamber, and the air inlet is provided at a lower portion of the air preheating chamber.
3. The methanol vaporization mixer of claim 2, wherein the upper part of the vaporization mixing chamber is provided with a methanol spray pipe, the methanol spray pipe is provided with a nozzle or a spray hole, and the inner end of the heating methanol inlet is communicated with the methanol spray pipe.
4. The methanol vaporization mixer according to any one of claims 1 to 3, wherein the heat exchange tubes are round tubes having a constant diameter or a variable diameter.
5. The methanol vaporization mixer of claim 4, wherein the heat exchange tube is a variable diameter round tube with a wave-shaped vertical section of the tube wall.
6. The methanol vaporization mixer of claim 5, wherein the heat exchange tubes are of equal diameter at the same height.
7. A methanol vaporizing mixer as claimed in any one of claims 1 to 3, characterized in that the preheated mixture inlet of the mixing pressure equalizing chamber is located at the top thereof.
8. The methanol vaporization mixer as claimed in claim 7, wherein the intermediate gas pipe is provided with a necking structure in the area near the mixing pressure equalizing chamber, and the preheated methanol inlet is arranged on the side wall of the intermediate gas pipe at the position where the pipe diameter of the necking structure is the smallest.
9. A methanol vaporization mixing method, which adopts the methanol vaporization mixer of any one of claims 1 to 8, introduces a methanol mixture gas for preheating containing methanol and oxygen into a heat exchange tube through a mixing pressure equalizing chamber to perform the catalytic oxidation reaction of methanol, introduces air into an air preheating chamber through an air inlet to absorb the heat energy released by the catalytic oxidation reaction of methanol, introduces the methanol for preheating in liquid state into an intermediate gas pipe or into the mixing pressure equalizing chamber through a preheating methanol inlet, mixes the methanol for preheating with the heated air led out from the air preheating chamber through an air outlet in the intermediate gas pipe and/or the mixing pressure equalizing chamber to form the methanol mixture gas for preheating, introduces the methanol for heating in liquid state into a vaporization mixing chamber through a methanol heating inlet, mixes the methanol mixture gas with the gas after the catalytic oxidation sent into the vaporization mixing chamber through the heat exchange tube to form the methanol mixture gas containing methanol and oxygen, and sends the methanol mixture gas through a methanol mixture gas outlet, the methanol concentration and/or the oxygen concentration in the methanol mixed gas are controlled by controlling the air flow introduced into the air preheating chamber through the air inlet and/or controlling the heating methanol flow introduced into the pressure equalizing mixing chamber through the heating methanol inlet, so that the methanol concentration and/or the oxygen concentration of the methanol mixed gas are met, and the heat release strength of the methanol catalytic oxidation reaction in the heat exchange tube is controlled by controlling the preheating methanol flow introduced into the intermediate gas pipe through the preheating methanol inlet or introduced into the mixing pressure equalizing chamber, so that the temperature requirement of the methanol mixed gas is met.
10. The method of claim 9, wherein the following is used to initiate:
in the starting process, heating air to a required temperature by using a heating device, continuously sending the heated air into an air preheating chamber through an air inlet under the condition that methanol for preheating and methanol for heating are not added, opening a methanol mixed gas outlet for air discharge, opening a preheating methanol inlet to introduce methanol for preheating after the air temperature in the air preheating chamber reaches the required temperature, closing the heating device, directly sending the air into the air inlet under the condition that the air is not heated by the heating device, opening a heating methanol inlet to introduce methanol for heating after the working condition of catalytic oxidation reaction of the methanol in a heat exchange tube is stable, and obtaining methanol mixed gas with a proper temperature from the methanol mixed gas outlet so as to enter a normal working state;
alternatively, the first and second electrodes may be,
in the starting process, under the condition that methanol for preheating and methanol for heating are not added, an air inlet and a methanol mixed gas outlet are opened, air circulation is carried out through the methanol mixed gas outlet and the air inlet, the circulating air is heated by a heating device, the air discharged from the methanol mixed gas outlet is used as the air inlet of the heating device, the air is heated by the heating device and then is sent into the air inlet again, after the air temperature in an air preheating chamber reaches the required temperature, the methanol for preheating is introduced into the preheated methanol inlet, the heating device is closed, the air is directly sent into the air inlet under the condition that the air is not heated by the heating device, after the methanol for heating is introduced into a methanol inlet in a heat exchange pipe, the methanol for heating is introduced into the methanol for heating, and the methanol mixed gas with the proper temperature is obtained from the methanol mixed gas outlet, so that the methanol for heating enters the.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115710168A (en) * | 2022-11-21 | 2023-02-24 | 聊城市鲁西化工工程设计有限责任公司 | System is prepared to ant aldehyde low energy consumption |
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