Treatment equipment for waste steam containing dichloromethane

Abstract

The utility model relates to treatment equipment for waste steam containing dichloromethane, which comprises a waste steam transmission unit, a waste steam recovery unit, a waste steam recovery unit, a waste steam recovery unit and a waste steam recovery unit, and is characterized in that the waste steam recovery unit comprises a first transmission pipeline for transmitting the waste steam containing dichloromethane; the liquid dichloromethane transmission unit comprises a second transmission pipeline for transmitting liquid dichloromethane; the steam generation unit comprises a steam generator, a steam output pipeline and a wastewater output pipeline. According to the utility model, on one hand, the steam generator is combined with the extraction tower and the distillation tower, so that not only can waste heat of waste steam containing dichloromethane be utilized, but also formed waste water can be used as an extraction agent, and a waste steam treatment process is combined with other treatment processes on line; therefore, the whole treatment process is simplified, and the production efficiency and economic benefits are effectively improved; on the other hand, the utilization rate of waste steam containing dichloromethane can be greatly increased, energy conservation and emission reduction are achieved, and the concept of environmental protection is met; in addition, the structure is simple and reliable, and installation and implementation are easy.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam treatment, and in particular relates to a treatment device for waste steam containing dichloromethane. Background Art

[0002] The boiling point of dichloromethane is 39.8℃. It is colorless and transparent, has a pungent odor, is slightly soluble in water, has high volatility, and has certain toxicity. Direct discharge of waste gas or waste steam containing dichloromethane will pollute the atmosphere and cause damage to the health of operators.

[0003] At present, a large amount of waste steam containing dichloromethane at 120°C and a pressure of about 0.1-0.2MPa is generated in a certain engineering project. The waste steam will corrode ordinary 304 or 316L stainless steel equipment. Therefore, harmless treatment of this type of waste steam has high economic and environmental benefits. As for the treatment of waste steam containing dichloromethane, the traditional treatment method is that the waste steam is completely condensed into liquid through a heat exchanger, enters a phase separator, and is allowed to stand for stratification. The concentrated water phase is the light phase at the top, and the concentrated dichloromethane phase is the heavy phase at the bottom. The light phase is circulated back to the high-pressure tower to reduce the generation of wastewater containing organic matter. The heavy phase is extracted and enters the dichloromethane storage tank to obtain a dichloromethane product with a purity greater than 99.95%. In short, the treatment method of the prior art is mainly to condense the waste steam containing dichloromethane into liquid and then further stratify it to recover dichloromethane.

[0004] However, in the actual processing process, the existing technology has the following technical defects:

[0005] 1. Only independent condensation equipment can be used to treat the waste steam containing dichloromethane, and it is impossible to form an online combination with other treatment processes (such as the DMAC wastewater treatment process that requires the use of dichloromethane solution as an extractant), so that the dichloromethane-containing wastewater formed by condensation cannot be effectively utilized and needs to be further recovered and reprocessed, resulting in a complex overall treatment process, low treatment efficiency, and poor economic benefits;

[0006] 2. The large amount of heat released in the waste steam heat exchange liquefaction process cannot be effectively utilized, resulting in waste, which is not in line with the concept of energy conservation and environmental protection. Utility Model Content

[0007] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a new treatment device for waste steam containing dichloromethane.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0009] A treatment device for waste steam containing dichloromethane, comprising

[0010] a waste steam transfer unit including a first transfer pipeline for transferring waste steam containing methylene chloride;

[0011] a liquid dichloromethane transmission unit, comprising a second transmission pipeline for transmitting liquid dichloromethane;

[0012] The steam generating unit comprises a steam generator respectively connected to a first transmission pipeline and a second transmission pipeline, and a steam output pipeline and a wastewater output pipeline respectively connected to the steam generator, wherein the steam output pipeline is connected to a distillation tower, and the wastewater output pipeline is connected to an extraction tower. During treatment, waste steam and liquid dichloromethane are respectively input into the steam generator through the first transmission pipeline and the second transmission pipeline for heat exchange, and the formed dichloromethane-containing wastewater and dichloromethane steam are respectively input into the extraction tower and the distillation tower through the wastewater output pipeline and the steam output pipeline.

[0013] According to a specific implementation and preferred aspect of the utility model, the steam transmission unit further includes a gas-liquid separator for separating liquid from waste steam, a steam storage tank for storing waste steam, and the first transmission pipeline sequentially connects the gas-liquid separator, the steam storage tank and the steam generator. Here, liquid droplets in the waste steam are separated, and the separated waste steam is collected in the steam storage tank so that the waste steam can be stably output.

[0014] According to another specific implementation and preferred aspect of the utility model, a liquid collecting tank is connected to the bottom of the distillation tower, and a second transmission pipeline is connected to the liquid collecting tank. During processing, dichloromethane vapor is liquefied by heat dissipation through the distillation tower and collected in the liquid collecting tank, and the liquid dichloromethane in the liquid collecting tank is input into the steam generator through the second transmission pipeline. Here, dichloromethane is used as an intermediate medium for waste steam waste heat utilization. After absorbing the waste steam heat energy, it is dissipated in the distillation tower to heat the mixed liquid. Since dichloromethane has a low boiling point, it is convenient and fast to use as a waste heat utilization medium. When used as a heat source for the distillation tower, the process conditions are low. At the same time, using dichloromethane vapor as the heat source of the distillation tower will not cause corrosion to stainless steel equipment, which has obvious advantages over water vapor.

[0015] According to another specific implementation and preferred aspect of the utility model, the steam generator includes a shell with an inlet and an outlet, a heat exchange component and a vapor-liquid separation component, wherein the outlet is located at the top of the shell and connected to the steam output pipeline, and the inlet is connected to the second transmission pipeline; the heat exchange component includes a heat exchange tube extending into the inner cavity of the shell, wherein one end of the heat exchange tube is connected to the first transmission pipeline and the other end is connected to the wastewater output pipeline; the vapor-liquid separation component is arranged in the inner cavity of the shell and located above the heat exchange tube, and the vapor-liquid separation component includes a plurality of mesh plates that are spaced apart and can intercept dichloromethane droplets, wherein a part of the plurality of mesh plates is located below the liquid dichloromethane surface and another part is located above the liquid dichloromethane surface, and when heated, the dichloromethane vapor passes through each mesh plate from bottom to top in sequence and is discharged from the outlet. Here, the dichloromethane droplets in the steam can be removed by intercepting the plurality of mesh plates, thereby effectively improving the stability of the output dichloromethane vapor temperature and pressure.

[0016] Preferably, there are two mesh plates, and the liquid level of the liquid dichloromethane is located between the two mesh plates; the liquid level of the liquid dichloromethane is set equal to the distance between the two mesh plates. Here, it is convenient to better form the dichloromethane vapor and vapor-liquid separation, and at the same time, the structure is simple, easy to install and implement.

[0017] Preferably, each mesh plate has a plurality of holes distributed at intervals, and the holes on adjacent mesh plates are staggered up and down; in each mesh plate, the diameter of the hole is 5 to 30 mm, and the spacing between two adjacent holes is less than or equal to 60 mm. Hereby, the interception rate of dichloromethane droplets is effectively improved, and the stability of the output temperature and pressure of dichloromethane vapor is ensured; at the same time, each mesh plate has the best separation effect on dichloromethane vapor and dichloromethane droplets.

[0018] Preferably, the shell includes a first shell body and a second shell body extending horizontally and connected from one end, wherein the height of the first shell body is less than the height of the second shell body, and the top of the second shell body forms an outlet; the heat exchange tube extends horizontally from one end of the first shell body away from the second shell body and extends into the second shell body, and the vapor-liquid separation component is arranged in the second shell body. Here, by utilizing the height difference between the first and second shell bodies, it can ensure that the heat exchange tube is quickly immersed in liquid dichloromethane, thereby improving the heat exchange efficiency.

[0019] Specifically, the cross-sections of the first shell body and the second shell body are both circular, and the inner diameter of the first shell body is smaller than the inner diameter of the second shell body; and / or, the bottoms of the first shell body and the second shell body are arranged flush; and / or, the mesh plate located at the top is arranged to fit the top inner wall of the second shell body.

[0020] Furthermore, an inlet is formed on the second shell body, wherein the inlet is located above or below the liquid level of the liquid dichloromethane.

[0021] In addition, the heat exchange tube is U-shaped and has air inlets and liquid discharge ports formed at both ends, and there are multiple heat exchange tubes distributed layer by layer. The heat exchange component also includes an auxiliary box, wherein the auxiliary box is formed with an air inlet area and a liquid discharge area separated from each other. The air inlet of each heat exchange tube is connected to the air inlet area, and the liquid discharge port is connected to the liquid discharge area. The first transmission pipeline and the wastewater output pipeline are respectively connected to the top of the air inlet area and the bottom of the liquid discharge area. The waste steam passes through the air inlet area and enters each heat exchange tube respectively, and is heat exchanged with liquid dichloromethane and liquefied before entering the liquid discharge area for discharge. Here, efficient and stable input and output of waste steam and wastewater can be achieved.

[0022] Due to the implementation of the above technical solution, the utility model has the following advantages compared with the prior art:

[0023] The prior art can only treat waste steam containing dichloromethane independently and cannot be combined with other processes, so that the formed waste water containing dichloromethane cannot be effectively utilized and needs to be further recovered and reprocessed, which leads to complex overall treatment process, low treatment efficiency and poor economic benefits. At the same time, a large amount of heat released in the waste steam heat exchange liquefaction process cannot be effectively utilized, resulting in waste, which is not in line with the concept of energy conservation and environmental protection. The present application designs the structure of the treatment equipment for waste steam containing dichloromethane as a whole, and cleverly solves the shortcomings and defects of the prior art. After adopting the treatment equipment, the waste steam containing dichloromethane is input into the steam generator through the first transmission pipeline, and the liquid dichloromethane is input into the steam generator through the second transmission pipeline, so that the liquid dichloromethane and the high-temperature waste steam containing dichloromethane undergo heat exchange, wherein the liquid dichloromethane After absorbing heat and evaporating to form dichloromethane vapor, it is output to the distillation tower through the steam output pipeline to provide heat for other treatment processes; after the waste steam containing dichloromethane dissipates heat and liquefies to form waste water, it is output to the extraction tower through the waste water output pipeline to serve as an extractant for other treatment processes; therefore, compared with the prior art, the utility model, on the one hand, by combining the steam generator with the extraction tower and the distillation tower, can not only utilize the waste heat of the waste steam containing dichloromethane, but also can use the formed waste water as an extractant, thereby realizing the online combination of the waste steam treatment process with other treatment processes, which is conducive to simplifying the overall treatment process and effectively improving production efficiency and economic benefits; on the other hand, it can greatly improve the utilization rate of the waste steam containing dichloromethane, achieve energy saving and emission reduction, and comply with the concept of environmental protection; in addition, the structure is simple and reliable, and easy to install and implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A simplified structural diagram of the treatment equipment for waste steam containing methylene chloride according to the utility model;

[0025] Figure 2 This is a simplified structural diagram of the steam generator of the utility model;

[0026] Figure 3 for Figure 2 Schematic diagram of the left side (partially omitted);

[0027] Wherein: A, waste steam transmission unit; A0, first transmission pipeline; A1, gas-liquid separator; A2, steam storage tank;

[0028] B, liquid dichloromethane transmission unit; B0, second transmission pipeline;

[0029] C, steam generating unit; C0, steam generator; C0, 1, shell; 11, first shell body; a0, drain port; 12, second shell body; k0, inlet; k1, outlet; a1, pressure gauge; a2, drain port;

[0030] a3, safety valve outlet; 13, support foot; 2, heat exchange component; 20, heat exchange tube; 21, auxiliary box; 210, air intake area; 211, liquid discharge area; 3, gas-liquid separation component; 30, mesh plate; C1, steam output pipeline; C2, wastewater output pipeline;

[0031] T1, distillation tower; T10, liquid collecting tank; T2, extraction tower. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, a detailed description is given below in conjunction with specific embodiments and drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0038] like Figures 1 to 3 As shown, the treatment equipment for waste steam containing dichloromethane in this embodiment includes a waste steam transmission unit A, a liquid dichloromethane transmission unit B, and a steam generation unit C.

[0039] Specifically, the waste steam transmission unit A includes a first transmission pipeline A0 for transmitting waste steam containing dichloromethane, a gas-liquid separator A1 for separating liquid from the waste steam, and a steam storage tank A2 for storing waste steam; the liquid dichloromethane transmission unit B includes a second transmission pipeline B0 for transmitting liquid dichloromethane; the steam generation unit C includes a steam generator C0 respectively connected to the first transmission pipeline A0 and the second transmission pipeline B0, a steam output pipeline C1 and a wastewater output pipeline C2 respectively connected to the steam generator C0, wherein the first transmission pipeline A0 is connected to the gas-liquid separator A1 in sequence; 1. Steam storage tank A2 and steam generator C0, steam output pipeline C1 is connected to the distillation tower T1 used in the separation equipment of dichloromethane and white oil mixture, and wastewater output pipeline C2 is connected to the extraction tower T2 used in the DMAC wastewater treatment equipment. During the treatment, waste steam and liquid dichloromethane are respectively input into the steam generator C0 through the first transmission pipeline A0 and the second transmission pipeline B0 and heat exchange is carried out, and the formed dichloromethane-containing wastewater and dichloromethane steam are respectively entered into the extraction tower T2 and distillation tower T1 through the wastewater output pipeline C2 and the steam output pipeline C1. As for the specific distillation process and extraction process, reference can be made to the Chinese patents with publication numbers CN111701263A and CN117923588A applied by the applicant, which will not be repeated here, and it is also clear that it can be implemented.

[0040] In some specific embodiments, the gas-liquid separator A1 and the steam storage tank A2 are both conventional equipment and are not described in detail here; the bottom of the distillation tower T1 is connected to a liquid collecting tank T10, and the second transmission pipeline B0 is connected to the liquid collecting tank T10. During processing, the dichloromethane vapor is liquefied by heat dissipation of the distillation tower T1 and collected in the liquid collecting tank T10, and the liquid dichloromethane in the liquid collecting tank T10 is input into the steam generator C0 through the second transmission pipeline B0.

[0041] In this example, the steam generator C0 includes a shell 1 , a heat exchange component 2 , and a vapor-liquid separation component 3 .

[0042] Specifically, the shell 1 includes a first shell body 11 and a second shell body 12 which extend horizontally and are connected from one end, and support feet 13 respectively arranged at the bottom of the first shell body 11 and the second shell body 12, wherein the height of the first shell body 11 is less than the height of the second shell body 12, and the side wall and the top of the second shell body 12 respectively form an inlet k0 and an outlet k1, the outlet k1 is connected to the steam output pipe C1, and the inlet k0 is connected to the second transmission pipe B0, that is, liquid dichloromethane is input into the shell 1 through the inlet k0, and the first shell body 11 is kept full of liquid dichloromethane, and a space is formed between the liquid dichloromethane level in the second shell body 12 and the top of the second shell body 12, wherein the inlet k0 is located above or below the dichloromethane liquid level.

[0043] For the convenience of implementation, the cross-sections of the first shell body 11 and the second shell body 12 are both circular, and the inner diameter of the first shell body 11 is smaller than the inner diameter of the second shell body 12; the bottoms of the first shell body 11 and the second shell body 12 are arranged flush; the bottom of the first shell body 11 is provided with a drain port a0 for emptying the liquid dichloromethane in the shell 1; the top of the second shell body 12 is also provided with a pressure gauge a1, a drain port a2 for draining the steam in the shell 1, and a safety valve port a3.

[0044] In this example, the heat exchange component 2 includes a heat exchange tube 20 extending into the inner cavity of the shell 1 and an auxiliary box 21, wherein the heat exchange tube 20 extends horizontally from one end of the first shell body 11 away from the second shell body 12 and extends into the second shell body 12, the heat exchange tube 20 is U-shaped and forms an air inlet and a liquid discharge port from both ends, and there are multiple heat exchange tubes 20 distributed layer by layer; an air inlet area 210 and a liquid discharge area 211 separated from each other are formed in the auxiliary box 21, the air inlet of each heat exchange tube 20 is connected to the air inlet area 210, and the liquid discharge port is connected to the liquid discharge area 211, the first transmission pipeline A0 and the wastewater output pipeline C2 are respectively connected to the top of the air inlet area 210 and the bottom of the liquid discharge area 211, the waste steam passes through the air inlet area 210 and enters each heat exchange tube 20 respectively, and forms wastewater after heat exchange with liquid dichloromethane and liquefaction, and enters the liquid discharge area 211 for discharge.

[0045] In this example, the vapor-liquid separation component 3 is arranged in the inner cavity of the shell 1 and is located above the heat exchange tube 20, and the vapor-liquid separation component 3 includes a plurality of mesh plates 30 that are spaced apart from each other and can intercept dichloromethane droplets, wherein a portion of the plurality of mesh plates 30 is located below the liquid dichloromethane surface, and another portion is located above the liquid dichloromethane surface. When heated, the dichloromethane vapor passes through each mesh plate 30 from bottom to top in turn and is discharged from the outlet k1.

[0046] In some specific embodiments, the gas-liquid separation component 3 is arranged in the second shell body 12, there are two mesh plates 30, and the liquid level of liquid dichloromethane is located between the two mesh plates 30; the mesh plate 30 located at the top is arranged in contact with the top inner wall of the second shell body 12; the liquid level of liquid dichloromethane and the distance between the two mesh plates 30 are set equal. In this embodiment, the mesh plate 30 located at the top is arched, and the mesh plate 30 located at the bottom is a flat plate fixedly connected to the inner wall of the second shell body 12 from the edge. Therefore, the distance between the lowest point of the mesh plate 30 located at the top and the liquid level of liquid dichloromethane is equal to the distance between the mesh plate 30 located at the bottom and the liquid level of liquid dichloromethane.

[0047] To further facilitate implementation, the mesh plate 30 is any conventional mesh plate, each mesh plate 30 has a plurality of holes distributed at intervals, and the plurality of holes on adjacent mesh plates 30 are staggered up and down; in each mesh plate, the diameter of the hole is 5 to 30 mm, and in each mesh plate, the spacing between two adjacent holes is less than or equal to 60 mm.

[0048] In summary, after adopting the treatment equipment, the waste steam containing dichloromethane is input into the steam generator through the first transmission pipeline, and the liquid dichloromethane is input into the steam generator through the second transmission pipeline, so that the liquid dichloromethane and the high-temperature waste steam containing dichloromethane undergo heat exchange, wherein the liquid dichloromethane absorbs heat and evaporates to form dichloromethane steam, which is then output to the distillation tower through the steam output pipeline to provide heat for other treatment processes; the waste steam containing dichloromethane dissipates heat and liquefies to form wastewater, which is then output to the extraction tower through the wastewater output pipeline to serve as an extractant for other treatment processes; therefore, compared with the existing Compared with the existing technology, the utility model, on the one hand, can utilize the waste heat of the waste steam containing dichloromethane by combining the steam generator with the extraction tower and the distillation tower, and can also use the formed waste water as an extractant, so as to realize the online combination of the waste steam treatment process with other treatment processes, thereby simplifying the overall treatment process and effectively improving the production efficiency and economic benefits; on the other hand, it can greatly improve the utilization rate of the waste steam containing dichloromethane, realize energy saving and emission reduction, and comply with the concept of environmental protection; in addition, the structure is simple, reliable, easy to install and implement; thirdly, the waste steam is separated droplets, and the separated waste steam is collected into the steam storage tank so that the waste steam can be stably output; fourthly, dichloromethane is used as an intermediate medium for waste steam waste heat utilization. After absorbing the waste steam heat energy, the mixed liquid is heated by heat dissipation in the distillation tower. Due to the low boiling point of dichloromethane, it is convenient and fast to use as a waste heat utilization medium. When used as a heat source for the distillation tower, the process conditions are low. At the same time, using dichloromethane steam as the heat source of the distillation tower will not cause corrosion to stainless steel equipment, which has obvious advantages over water vapor; fifthly, through the interception of multiple mesh plates, dichloromethane in the steam can be removed dichloromethane droplets, thereby effectively improving the stability of the output dichloromethane vapor temperature and pressure; sixthly, through the layout of the upper and lower mesh plates relative to the dichloromethane liquid surface, it is convenient to better form dichloromethane vapor and vapor-liquid separation; seventhly, through the layout of the holes on the upper and lower mesh plates, the interception rate of dichloromethane droplets is effectively improved, ensuring the stability of the output temperature and pressure of dichloromethane vapor, and at the same time, the separation effect of dichloromethane vapor and dichloromethane droplets is optimal; eighthly, by utilizing the height difference between the first and second shell bodies, it can ensure that the heat exchange tube is quickly immersed in liquid dichloromethane, thereby improving the heat exchange efficiency.

[0049] The above detailed description of the utility model is intended to enable people familiar with the technology in this field to understand the content of the utility model and implement it. It does not limit the protection scope of the utility model. The utility model is not limited to the above-mentioned embodiments. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A treatment device for waste steam containing methylene chloride, characterized in that: It includes a waste steam transfer unit including a first transfer pipeline for transferring waste steam containing methylene chloride; a liquid dichloromethane transmission unit, comprising a second transmission pipeline for transmitting liquid dichloromethane; A steam generating unit, comprising a steam generator respectively connected to the first transmission pipeline and the second transmission pipeline, and a steam output pipeline and a wastewater output pipeline respectively connected to the steam generator, wherein the steam output pipeline is connected to the distillation tower, and the wastewater output pipeline is connected to the extraction tower. During treatment, the waste steam and liquid dichloromethane are respectively input into the steam generator through the first transmission pipeline and the second transmission pipeline and heat exchange is performed, and the formed dichloromethane-containing wastewater and dichloromethane steam respectively enter the extraction tower and the distillation tower through the wastewater output pipeline and the steam output pipeline.

2. The treatment equipment for waste steam containing methylene chloride according to claim 1, characterized in that: The steam transmission unit also includes a gas-liquid separator for separating liquid from waste steam and a steam storage tank for storing waste steam. The first transmission pipeline sequentially connects the gas-liquid separator, the steam storage tank and the steam generator.

3. The treatment equipment for waste steam containing methylene chloride according to claim 1, characterized in that: The bottom of the distillation tower is connected to a liquid collecting tank, and the second transmission pipeline is connected to the liquid collecting tank. During processing, dichloromethane vapor is liquefied by heat dissipation of the distillation tower and collected in the liquid collecting tank, and the liquid dichloromethane in the liquid collecting tank is input into the steam generator through the second transmission pipeline.

4. The treatment equipment for waste steam containing methylene chloride according to claim 1, characterized in that: The steam generator comprises a shell with an inlet and an outlet, a heat exchange component and a vapor-liquid separation component, wherein the outlet is located at the top of the shell and connected to the steam output pipeline, and the inlet is connected to the second transmission pipeline; the heat exchange component comprises a heat exchange tube extending into the inner cavity of the shell, wherein one end of the heat exchange tube is connected to the first transmission pipeline, and the other end is connected to the wastewater output pipeline; the vapor-liquid separation component is arranged in the inner cavity of the shell and located above the heat exchange tube, and the vapor-liquid separation component comprises a plurality of mesh plates which are spaced apart from each other and can intercept dichloromethane droplets, wherein a part of the plurality of mesh plates is located below the liquid dichloromethane surface, and another part is located above the liquid dichloromethane surface, and when heated, the dichloromethane vapor passes through each of the mesh plates from bottom to top in sequence and is discharged from the outlet.

5. The treatment equipment for waste steam containing methylene chloride according to claim 4, characterized in that: There are two mesh plates, and the liquid surface of the liquid dichloromethane is located between the two mesh plates; the liquid surface of the liquid dichloromethane is set equal to the distance between the two mesh plates.

6. The treatment equipment for waste steam containing methylene chloride according to claim 4, characterized in that: Each mesh plate has a plurality of holes distributed at intervals, and the plurality of holes on adjacent mesh plates are staggered up and down; in each mesh plate, the diameter of the hole is 5 to 30 mm, and the spacing between two adjacent holes is less than or equal to 60 mm.

7. The treatment equipment for waste steam containing methylene chloride according to claim 4, characterized in that: The shell includes a first shell body and a second shell body extending horizontally and connected from one end, wherein the height of the first shell body is smaller than the height of the second shell body, and the top of the second shell body forms the outlet; the heat exchange tube extends horizontally from one end of the first shell body away from the second shell body and extends into the second shell body, and the vapor-liquid separation component is arranged in the second shell body.

8. The treatment equipment for waste steam containing methylene chloride according to claim 7, characterized in that: The cross-sections of the first shell body and the second shell body are both circular, and the inner diameter of the first shell body is smaller than the inner diameter of the second shell body; and / or, the bottoms of the first shell body and the second shell body are arranged flush; and / or, the mesh plate located at the top is arranged to fit the top inner wall of the second shell body.

9. The treatment equipment for waste steam containing methylene chloride according to claim 7, characterized in that: The inlet is also formed on the second shell body, wherein the inlet is located above or below the liquid level of the liquid dichloromethane.

10. The treatment equipment for waste steam containing methylene chloride according to claim 4, characterized in that: The heat exchange tube is U-shaped and has an air inlet and a liquid discharge port formed at both ends, and there are multiple heat exchange tubes distributed layer by layer. The heat exchange component also includes an auxiliary box, wherein the auxiliary box is formed with an air inlet area and a liquid discharge area separated from each other, the air inlet of each heat exchange tube is connected to the air inlet area, and the liquid discharge port is connected to the liquid discharge area, the first transmission pipeline and the wastewater output pipeline are respectively connected to the top of the air inlet area and the bottom of the liquid discharge area, the waste steam passes through the air inlet area and enters each heat exchange tube respectively, and enters the liquid discharge area for discharge after heat exchange with liquid dichloromethane and liquefaction.

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