阅读说明：本技术 一种用于百菌清生产的液氯汽化工艺及其汽化装置 (Liquid chlorine vaporization process and vaporization device for chlorothalonil production ) 是由 王海波 王春云 王潭 王振宇 于 2021-02-07 设计创作，主要内容包括：本发明涉及一种用于百菌清生产的液氯汽化工艺及其汽化装置,所述液氯汽化工艺采用热风作为液氯汽化的加热介质,所述液氯汽化装置包括壳程和管程,所述管程用于液氮通过,所述壳程用于热风通过,所述管程除了进口和出口均位于所述壳程内部,所述壳程为长方体结构。本发明所述液氯汽化工艺采用热风作为液氯汽化的加热介质,不仅可以充分利用百菌清生产装置中的余热,有效提高液氯的汽化效率,减少设备体积与成本投入,还可以保证液氯汽化温度,避免三氯化氮在液氯汽化装置内的累积,而且具有高效、密闭、连续化的特点。(The invention relates to a liquid chlorine vaporization process for chlorothalonil production and a vaporization device thereof, wherein hot air is adopted as a heating medium for vaporizing liquid chlorine in the liquid chlorine vaporization process, the liquid chlorine vaporization device comprises a shell side and a tube side, the tube side is used for liquid nitrogen to pass through, the shell side is used for hot air to pass through, the tube side except an inlet and an outlet is positioned inside the shell side, and the shell side is of a cuboid structure. The liquid chlorine vaporization process adopts hot air as a heating medium for vaporizing liquid chlorine, can fully utilize the waste heat in a chlorothalonil production device, effectively improve the vaporization efficiency of the liquid chlorine, reduce the equipment volume and the cost investment, ensure the vaporization temperature of the liquid chlorine, avoid the accumulation of nitrogen trichloride in the liquid chlorine vaporization device, and has the characteristics of high efficiency, sealing and continuity.)

1. A liquid chlorine vaporization process for chlorothalonil production is characterized in that hot air is used as a heating medium for vaporizing liquid chlorine.

2. The liquid chlorine vaporization process of claim 1, wherein the hot air is generated by using waste heat in a chlorothalonil production device;

preferably, the temperature of the hot air is 80-220 ℃, preferably 150-;

preferably, the wind speed of the hot wind is 10-20 m/s;

preferably, the temperature after vaporization of the liquid chlorine is from 71 to 90 ℃, preferably from 80 to 90 ℃.

3. The utility model provides a liquid chlorine vapourizing unit for chlorothalonil production which characterized in that, liquid chlorine vapourizing unit includes shell side and tube side, the tube side is used for the liquid nitrogen to pass through, the shell side is used for hot-blast passing through, the tube side is except that import and export all are located inside the shell side, the shell side is the cuboid structure.

4. The liquid chlorine vaporization device of claim 3, wherein the tube side is a serpentine tube;

preferably, the tube side is finned;

preferably, the heat exchange area of the tube side is 30-300m²；

Preferably, the tube pass is made of Monel alloy and/or nickel alloy.

5. Liquid chlorine vaporizing device according to claim 3 or 4, characterized in that the tube side has a diameter of 4-32 mm;

preferably, the thickness of the tube side is 2-5 mm;

preferably, the length of the tube side is 1-4m, preferably 1.5-3 m;

preferably, the number of the tube passes is 50-400, preferably 200-400.

6. The liquid chlorine vaporization unit of any of claims 3-5, wherein the tube-side inlet is disposed at the bottom of the shell-side and the tube-side outlet is disposed at the top of the shell-side;

preferably, the inlet and the outlet of the tube side are connected in a flange mode.

7. The liquid chlorine vaporizing device according to any one of claims 3 to 6, wherein a first baffle plate is disposed inside the shell pass, the first baffle plate is perpendicular to the bottom of the shell pass and is fixedly connected with the bottom of the shell pass, and the distance between the bottom edge of the first baffle plate and the top of the shell pass is 200-600 mm;

preferably, the thickness of the first baffle plate is 10-20 mm;

preferably, the number of the first baffle plates is 1-10;

preferably, the first baffle is made of Monel alloy and/or nickel alloy.

8. The liquid chlorine vaporizing device according to any one of claims 3 to 7, wherein a second baffle is disposed inside the shell pass, the second baffle is perpendicular to the top of the shell pass and is fixedly connected with the top of the shell pass, and the distance between the bottom edge of the second baffle and the bottom of the shell pass is 200-600 mm;

preferably, the thickness of the second baffle plate is 10-20 mm;

preferably, the number of the second baffle plates is 1-10;

preferably, the second baffle is made of monel and/or nickel alloy.

9. The liquid chlorine vaporization device according to any one of claims 3 to 8, wherein an inlet of the shell side is provided at a bottom of one end and an outlet of the shell side is provided at a bottom of the other end in a length direction of the shell side;

preferably, the inlet and the outlet of the shell side are connected in a flange mode;

preferably, the material of the shell side comprises any one or a combination of at least two of carbon steel, stainless steel, monel or nickel alloy.

10. The liquid chlorine vaporization device of any one of claims 3-9, wherein a chlorine gas detector is provided at the outlet of the shell side.

Technical Field

The invention relates to the technical field of liquid chlorine vaporization, in particular to a liquid chlorine vaporization process for chlorothalonil production and a vaporization device thereof.

Background

Chlorine gas is an important industrial raw material, and has very wide application in industrial production in China, particularly in chemical industrial production. However, since the boiling point of chlorine gas is-34.6 ℃, the chlorine gas has active chemical properties and toxic effects on human bodies, in the actual production process, the chlorine gas can be liquefied into liquid chlorine, so that the purification effect can be achieved, the transportation and the storage can be convenient, and in the actual use process, the liquid chlorine is vaporized into the chlorine gas. However, since the liquid chlorine is a dangerous material, how to ensure the safety of the liquid chlorine vaporization in use is a very concern for most users of liquid chlorine.

Liquid chlorine is generally stored in cylinders, and there are two methods of cylinder gas phase discharge and cylinder liquid phase discharge. For gas-phase discharge of a steel cylinder, the amount of vaporized chlorine of the steel cylinder (particularly in winter) cannot meet production requirements, a method of directly heating the steel cylinder is often adopted to accelerate vaporization, but the method of directly heating the steel cylinder can cause the temperature of liquid chlorine to rise sharply, overpressure in the liquid chlorine steel cylinder or a buffer tank is caused, and even a safety plug is melted, so that serious safety accidents are caused. The discharge of the liquid phase from the steel cylinder means that the liquid chlorine is introduced into a vaporization tank (belonging to three types of pressure vessels) with a heating jacket to be vaporized, and is a common method at present.

At present, the method for discharging the liquid phase of the steel cylinder generally adopts the heating modes such as steam, hot water or electric heating. For example, CN207634987U discloses an improved steam heating liquid chlorine continuous gasification system, which comprises a liquid chlorine tank, a gasifier connected with the liquid chlorine tank, and a liquid level ultrahigh interlocking system connected with the gasifier, wherein the gasifier comprises a shell layer for liquid chlorine to pass through and a pipe layer arranged inside the shell layer for steam to pass through, the lower part and the upper part of the shell layer are respectively provided with a liquid chlorine inlet and a chlorine outlet, and two ends of the lower part of the pipe layer are respectively provided with a steam inlet and a condensed water outlet. The system adopts steam as a heating medium, so that condensed water is required to be discharged in time, and water and chlorine are easily reacted quickly to generate hypochlorous acid when liquid chlorine leaks, so that equipment is seriously corroded, and a leakage point is rapidly enlarged.

CN201836644U discloses an automatic hot water heating device for a liquid chlorine vaporizer, which includes a hot water tank, a cold water inlet pipe, a steam inlet pipe, and a hot water outlet pipe and a hot water return pipe for communicating with a heating water jacket of the liquid chlorine vaporizer are provided on the hot water tank, a hot water circulating pump is provided on the hot water outlet pipe or the hot water return pipe, a control valve is provided on the steam inlet pipe, a temperature measuring device is provided on the hot water outlet pipe, the temperature measuring device is connected with an input end of a control unit, and an output end of the control unit is connected with the control valve. The device adopts hot water as heating medium to prepare hot water through steam heating, not only has the energy extravagant, still very easily causes water and chlorine fast reaction when liquid chlorine takes place to leak and generates hypochlorous acid, and then seriously corrodes equipment, makes the leakage point enlarge rapidly.

CN110762387A discloses high-purity liquid chlorine tank wagon device of unloading, including liquid chlorine vaporizer and liquid chlorine storage tank, wherein the import of liquid chlorine vaporizer and liquid chlorine storage tank discharging pipe one end intercommunication, set up interlocking control's thermometer and electric heating in the cover of liquid chlorine vaporizer. Although the device can realize the vaporization of liquid chlorine under accurate control, adopt electric heating to increase equipment input, increased the cost input, be unfavorable for using widely on a large scale.

Chlorothalonil, chemically named tetrachloroisophthalonitrile, is a high-efficiency, low-toxicity, broad-spectrum and low-residue protective bactericide, is widely applied to the control of fungal diseases in agriculture and forestry, and is particularly applied to economic crops such as vegetables and fruits; in addition, chlorothalonil has important application in the mildew-proof industrial field, such as the mildew prevention of manufacturing mildew-proof coating, mildew-proof wallpaper, electrical appliance mildew resistance, wood and the like, the production scale is continuously expanded at home and abroad, and the chlorothalonil becomes one of large-tonnage excellent pesticide varieties in the world. Chlorothalonil is usually prepared by a gas-phase chlorination method, belongs to a strong exothermic reaction, and on one hand, waste heat generated in the production process of chlorothalonil is not fully utilized at present, and on the other hand, the vaporization quantity of liquid chlorine can not meet the production requirement frequently, and a vaporization device runs stably for a long time and has potential safety hazards.

In summary, there is a need to develop a liquid chlorine vaporization process and a vaporization apparatus thereof for chlorothalonil production, which can not only utilize waste heat generated in the production process of chlorothalonil, provide heat for the vaporization of the liquid chlorine by adopting a hot air heating mode, but also avoid the generation of hypochlorous acid by the rapid reaction of water and chlorine when the liquid chlorine leaks, so as to severely corrode equipment, and have the characteristics of high efficiency, sealing and continuity.

Disclosure of Invention

In view of the problems in the prior art, the invention provides a liquid chlorine vaporization process for chlorothalonil production and a vaporization device thereof, wherein the liquid chlorine vaporization process adopts hot air as a heating medium for vaporizing liquid chlorine, so that the waste heat in the chlorothalonil production device can be fully utilized, the vaporization efficiency of the liquid chlorine is effectively improved, the equipment volume and the cost investment are reduced, the vaporization temperature of the liquid chlorine can be ensured, the accumulation of nitrogen trichloride in the liquid chlorine vaporization device is avoided, and the liquid chlorine vaporization process has the characteristics of high efficiency, sealing and continuity.

In order to achieve the purpose, the invention adopts the following technical scheme:

one of the purposes of the invention is to provide a liquid chlorine vaporization process for chlorothalonil production, which adopts hot air as a heating medium for liquid chlorine vaporization.

Compared with the prior art which adopts modes of steam, hot water or electric heating and the like, the liquid chlorine vaporization process adopts hot air as a heating medium for vaporizing liquid chlorine, and particularly utilizes waste heat in a chlorothalonil production device to generate hot air, on one hand, the hot air does not react with chlorine gas strongly, so that the dangerous accidents of equipment serious corrosion can be avoided due to the fact that water reacts with chlorine rapidly to generate hypochlorous acid when liquid chlorine leaks, the equipment volume and the cost input are reduced, on the other hand, the vaporization efficiency of the liquid chlorine can be effectively improved, the vaporization temperature of the liquid chlorine is ensured, the accumulation of nitrogen trichloride in the liquid chlorine vaporization device is avoided, and the liquid chlorine vaporization process has the characteristics of high efficiency, tightness and continuity.

As the preferable technical scheme of the invention, the hot air is generated by utilizing the waste heat in a chlorothalonil production device, such as an outlet of a chlorothalonil catcher, an outlet of a cooling fan, heat conducting oil in a reaction device, a water heat exchanger and the like.

Preferably, the temperature of the hot air is 80-220 ℃, such as 80 ℃, 100 ℃, 120 ℃, 150 ℃, 170 ℃, 190 ℃, 200 ℃ or 220 ℃, etc., preferably 150-.

Preferably, the wind speed of the hot wind is 10-20m/s, such as 10m/s, 12m/s, 14m/s, 15m/s, 17m/s or 20m/s, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable.

Preferably, the temperature after vaporization of the liquid chlorine is from 71 to 90 ℃, for example 71 ℃, 75 ℃, 80 ℃, 82 ℃, 85 ℃, 87 ℃ or 90 ℃, preferably 80 to 90 ℃, but is not limited to the recited values, and other values not recited in the numerical range are equally applicable.

The liquid chlorine vaporization process controls the temperature of the vaporized liquid chlorine to be 71-90 ℃, can effectively ensure the complete vaporization of the dangerous material nitrogen trichloride in the vaporization process, avoids the accumulation of the nitrogen trichloride in a liquid chlorine vaporization device, and further avoids the detonation and explosion accidents caused by the nitrogen trichloride.

The invention also aims to provide a liquid chlorine vaporizing device for producing chlorothalonil, which comprises a shell side and a tube side, wherein the tube side is used for liquid nitrogen to pass through, the shell side is used for hot air to pass through, the tube side is positioned inside the shell side except for an inlet and an outlet, and the shell side is of a cuboid structure.

As a preferable technical scheme of the invention, the tube pass is a coiled tube.

Preferably, the tube side is finned.

The liquid chlorine vaporizing device of the invention designs the tube pass as the snakelike fin type heat exchange tube, thereby increasing the heat exchange area to the maximum extent, improving the heat exchange efficiency, reducing the equipment volume and investment and ensuring the vaporization amount of the liquid chlorine required by the chlorothalonil production.

Preferably, the heat exchange area of the tube side is 30-300m²E.g. 30m²、50m²、100m²、150m²、200m²、250m²Or 300m²And the like, but are not limited to the recited values, and other values not recited within the recited range of values are equally applicable.

Preferably, the tube pass is made of Monel alloy and/or nickel alloy.

In a preferred embodiment of the present invention, the diameter of the tube side is 4 to 32mm, for example, 4mm, 8mm, 12mm, 16mm, 20mm, 24mm, 28mm, or 32mm, but is not limited to the values listed, and other values not listed in the above range are also applicable.

Preferably, the tube side has a thickness of 2 to 5mm, for example 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, but is not limited to the recited values, and other values not recited within the recited ranges are equally applicable.

Preferably, the length of the tube side is 1 to 4m, for example 1m, 1.5m, 2m, 2.5m, 3m, 3.5m or 4m, etc., preferably 1.5 to 3m, but is not limited to the recited values, and other values not recited in the numerical range are equally applicable.

Preferably, the number of the tube passes is 50-400, such as 50, 80, 100, 150, 200, 230, 250, 300, 350 or 400, etc., preferably 200-400, but not limited to the recited values, and other unrecited values within the range of the recited values are equally applicable.

It is worth to be noted that the tube side of the invention is preferably a serpentine finned heat exchange tube, the whole plane of each tube side is perpendicular to the bottom of the shell side (i.e. perpendicular to the top of the shell side), and all the tube sides in the shell side are arranged in parallel; the inlets of all tube passes are communicated with the same straight tube, then the straight tube is communicated with the liquid chlorine inlet, the main part of the straight tube is positioned in the shell pass, the outlet of the tube pass is communicated with the other straight tube, then the straight tube is communicated with the liquid chlorine inlet, and the main part of the straight tube is positioned in the shell pass, so that the liquid nitrogen vaporization capacity can be increased as much as possible, and the production efficiency is improved; in addition, all tube passes can be divided into at least two groups according to the design in the same shell pass, then the inlet (or outlet) of each group is converged into a pipeline outside the shell pass, once accidents such as leakage and the like happen to a certain group of tube passes, the inlet and/or outlet of the group of tube passes are correspondingly closed, and the vaporization capacity of the liquid chlorine can still be ensured by other groups of tube passes.

As a preferable technical scheme of the invention, an inlet of the tube side is arranged at the bottom of the shell side, and an outlet of the tube side is arranged at the top of the shell side.

Preferably, the inlet and the outlet of the tube side are connected in a flange mode.

As a preferred technical solution of the present invention, a first baffle is disposed inside the shell side, the first baffle is perpendicular to the bottom of the shell side and is fixedly connected to the bottom of the shell side, and the distance between the bottom edge of the first baffle and the top of the shell side is 200mm and 600mm, such as 200mm, 300mm, 400mm, 500mm, or 600mm, but the present invention is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.

Preferably, the first baffle has a thickness of 10 to 20mm, such as 10mm, 12mm, 15mm, 18mm or 20mm, but not limited to the recited values, and other values not recited within the recited ranges are equally applicable.

Preferably, the number of the first baffle is 1 to 10, such as 1, 3, 5, 7, 9 or 10, etc., but not limited to the recited values, and other values not recited in the recited range of values are equally applicable.

Preferably, the first baffle is made of Monel alloy and/or nickel alloy.

As a preferred technical solution of the present invention, a second baffle is disposed inside the shell pass, the second baffle is perpendicular to the top of the shell pass and is fixedly connected to the top of the shell pass, and the distance between the bottom edge of the second baffle and the bottom of the shell pass is 200mm and 600mm, such as 200mm, 300mm, 400mm, 500mm, or 600mm, but the present invention is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.

Preferably, the second baffle has a thickness of 10 to 20mm, such as 10mm, 12mm, 15mm, 18mm or 20mm, but not limited to the recited values, and other values within the recited ranges are equally applicable.

Preferably, the number of the second baffle is 1-10, such as 1, 3, 5, 7, 9 or 10, etc., but not limited to the recited values, and other values not recited in the recited range of values are equally applicable.

Preferably, the second baffle is made of monel and/or nickel alloy.

The width of the first baffling plate and the width of the second baffling plate are equal to the width of the liquid chlorine vaporizing device, and the first baffling plate and the second baffling plate are sequentially arranged at intervals to divide the interior of a shell pass into a plurality of heat exchange areas which are the same up and down, so that the hot air retention time is increased, and meanwhile, the requirements on the strength of equipment, the process requirements and the installation conditions of the interior of the equipment and the like need to be ensured.

As a preferable technical scheme of the invention, along the length direction of the shell side, an inlet of the shell side is arranged at the bottom of one end, and an outlet of the shell side is arranged at the bottom of the other end.

Preferably, the inlet and the outlet of the shell side are connected in a flange mode.

Preferably, the material of the shell side comprises any one or a combination of at least two of carbon steel, stainless steel, monel or nickel alloy.

As a preferred technical scheme of the invention, a chlorine gas detector is arranged at the outlet of the shell side. Once liquid chlorine leakage is detected, an alarm is given in time, so that the accident problem caused by the liquid chlorine leakage is effectively avoided.

Compared with the prior art, the invention at least has the following beneficial effects:

the liquid chlorine vaporization process adopts hot air as a heating medium for vaporizing liquid chlorine, and particularly utilizes waste heat in a chlorothalonil production device to generate the hot air, so that on one hand, the dangerous accidents that water and chlorine react quickly to generate hypochlorous acid when the liquid chlorine leaks can be avoided, further equipment is seriously corroded, the equipment volume and the cost input are reduced, on the other hand, the vaporization efficiency of the liquid chlorine can be effectively improved, the vaporization efficiency is over 99.95 percent, the vaporization temperature of the liquid chlorine is ensured, the accumulation of nitrogen trichloride in the liquid chlorine vaporization device is avoided, and the liquid chlorine vaporization process has the characteristics of high efficiency, sealing and continuity.

Drawings

FIG. 1 is a left side view (left side plate with shell side removed) of a liquid chlorine vaporizing apparatus according to example 1 of the present invention;

FIG. 2 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 3 is a front view of a liquid chlorine vaporizing apparatus according to example 1 of the present invention (front side plate with shell side removed);

in the figure: 1-shell side; 11-a first baffle; 12-a second baffle; 13-inlet of shell side; 14-outlet of the shell side; 2-tube pass; 21-inlet of tube side; 22-outlet of tube side.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:

example 1

As shown in fig. 1-3, this embodiment provides a liquid chlorine vaporizing device for chlorothalonil production, for convenience of illustration, fig. 1 is a left side view corresponding to a left side plate with a shell pass removed, fig. 3 is a front view corresponding to a front side plate with a shell pass removed, and each tube pass in fig. 3 is simplified into a dot-dash line, and arrows show a hot air flowing direction; the liquid chlorine vaporizing device comprises a shell side 1 and a tube side 2, wherein the tube side 2 is used for liquid nitrogen to pass through, the shell side 1 is used for hot air to pass through, the tube side 2 except an inlet 21 and an outlet 22 is positioned inside the shell side 1, and the shell side 1 is of a cuboid structure;

the number of the tube passes is 36, each tube pass is a snakelike finned heat exchange tube, and the total heat exchange area is 100m²The material is nickel alloy, the diameter is 4mm, the thickness is 2mm, and the length of each tube pass is 1.5 m; the tube passes are averagely divided into 2 groups, the inlet 21 of each group of tube passes is arranged at the bottom of the shell pass 1, the outlet 22 is arranged at the top of the shell pass 1, the inlet (or outlet) of each group of tube passes is connected in a flange mode and is respectively arranged outside the shell pass 1Partially merge into a pipeline;

a first baffling plate 11 is arranged in the shell pass 1, the first baffling plate 11 is perpendicular to the bottom of the shell pass 1 and is fixedly connected with the bottom of the shell pass 1, the distance between the bottom edge of the first baffling plate 11 and the top of the shell pass 1 is 400mm, the thickness of the baffling plate is 15mm, the number of the baffling plates is 3, and the baffling plate is made of Monel alloy; a second baffling baffle 12 is arranged in the shell pass 1, the second baffling baffle 12 is perpendicular to the top of the shell pass 1 and is fixedly connected with the top of the shell pass 1, the distance between the bottom edge of the second baffling baffle 12 and the bottom of the shell pass 1 is 400mm, the thickness of the second baffling baffle is 15mm, the number of the second baffling baffles is 3, and the second baffling baffle 12 is made of Monel alloy; along the length direction of the shell pass 1, an inlet 13 of the shell pass is arranged at the bottom of one end, an outlet 14 of the shell pass is arranged at the bottom of the other end, the inlet 13 and the outlet 14 of the shell pass are connected in a flange mode, the shell pass 1 is made of nickel alloy, and a chlorine detector is arranged at the outlet 14 of the shell pass.

By adopting the liquid chlorine vaporizing device, hot air comes from chlorothalonil to synthesize chlorination reaction waste heat, the liquid chlorine vaporizing device is preheated by the hot air, then the liquid chlorine is slowly introduced from a tube pass inlet, the liquid chlorine migrates in each snakelike fin type heat exchange tube and fully exchanges heat with the hot air outside the tube pass, the temperature of the hot air is controlled to be 150-85 ℃, and the temperature after the liquid chlorine is vaporized is 80-85 ℃, so that the hot air sequentially passes through a plurality of heat exchange chambers under the action of the first baffling plate and the second baffling plate and is baffled back and forth in a snakelike manner in the liquid chlorine vaporizing system, the liquid chlorine is completely vaporized, the nitrogen trichloride is not enriched in the vaporizing process, and the vaporizing efficiency is more than 99.95%.

Example 2

This example provides a liquid chlorine vapourizing unit for chlorothalonil production, except that set up the quantity of said tube side as 200, total heat transfer area is 250m²The number of the first baffle and the number of the second baffle are 10, and other conditions are exactly the same as those in example 1.

By adopting the liquid chlorine vaporizing device, hot air comes from chlorothalonil to synthesize chlorination reaction waste heat, the liquid chlorine vaporizing device is preheated by the hot air, then the liquid chlorine is slowly introduced from a tube pass inlet, the liquid chlorine migrates in each snakelike fin type heat exchange tube and fully exchanges heat with the hot air outside the tube pass, the temperature of the hot air is controlled to be 150-85 ℃, and the temperature after the liquid chlorine is vaporized is 80-85 ℃, so that the hot air sequentially passes through a plurality of heat exchange chambers under the action of the first baffling plate and the second baffling plate and is baffled back and forth in a snakelike manner in the liquid chlorine vaporizing system, the liquid chlorine is completely vaporized, the nitrogen trichloride is not enriched in the vaporizing process, and the vaporizing efficiency is more than 99.95%.

Example 3

This example provides a liquid chlorine vapourizing unit for chlorothalonil production, except that set up the quantity of said tube side as 100, total heat transfer area is 180m²The number of the first baffle and the number of the second baffle are 10, and other conditions are exactly the same as those in example 1.

By adopting the liquid chlorine vaporizing device, hot air comes from chlorothalonil to synthesize chlorination reaction waste heat, the liquid chlorine vaporizing device is preheated by the hot air, then the liquid chlorine is slowly introduced from a tube pass inlet, the liquid chlorine migrates in each snakelike fin type heat exchange tube and fully exchanges heat with the hot air outside the tube pass, the temperature of the hot air is controlled to be 180-200 ℃, the temperature after vaporization of the liquid chlorine is 85-90 ℃, the hot air sequentially passes through a plurality of heat exchange chambers under the action of the first baffling plate and the second baffling plate and is baffled back and forth in the liquid chlorine vaporizing system in a snakelike manner, so that the liquid chlorine is completely vaporized, the nitrogen trichloride is not enriched in the vaporizing process, and the vaporizing efficiency is more than 99.95%.

Example 4

This example provides a liquid chlorine vapourizing unit for chlorothalonil production, except that set the quantity of said tube side to 240, total heat transfer area is 150m²The diameter of each tube pass is 15mm, the thickness is 3mm, the number of the first baffling plates and the number of the second baffling plates are 8, and other conditions are completely the same as those of the embodiment 1.

By adopting the liquid chlorine vaporizing device, hot air comes from chlorothalonil to synthesize chlorination reaction waste heat, the liquid chlorine vaporizing device is preheated by the hot air, then the liquid chlorine is slowly introduced from a tube pass inlet, the liquid chlorine migrates in each snakelike fin type heat exchange tube and fully exchanges heat with the hot air outside the tube pass, the temperature of the hot air is controlled to be 180-200 ℃, the temperature after vaporization of the liquid chlorine is 85-90 ℃, the hot air sequentially passes through a plurality of heat exchange chambers under the action of the first baffling plate and the second baffling plate and is baffled back and forth in the liquid chlorine vaporizing system in a snakelike manner, so that the liquid chlorine is completely vaporized, the nitrogen trichloride is not enriched in the vaporizing process, and the vaporizing efficiency is more than 99.95%.

The applicant declares that the present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.