CN220360721U - Tube type falling film evaporator - Google Patents

Abstract

The utility model relates to a tubular falling film evaporator, which comprises an evaporation tank, a film distribution device and a heating pipe, wherein the film distribution device and the heating pipe are arranged in the evaporation tank, the film distribution device comprises a main body and a fixed ring, the fixed ring is connected with the heating pipe, the main body is provided with a flow guide surface, a flow guide channel is formed between at least the flow guide surface and the fixed ring, and the flow guide channel is used for guiding materials to flow to the inner wall of the heating pipe to form a film. According to the tubular falling film evaporator provided by the utility model, the film distribution device is correspondingly connected with the heating pipe, so that materials can flow into the heating pipe more accurately, the uniformity of film distribution is improved, meanwhile, the film distribution device is provided with the flow guide surface, the flow guide surface and the flow guide channel are used for guiding the flow of the materials, and the flow of the materials to the inner wall of the heating pipe is standardized, so that the uniformity of film distribution is further improved, and the problem of uneven film distribution in the prior art is solved.

Description

Tube type falling film evaporator

Technical Field

The utility model belongs to the technical field of falling film evaporation, and particularly relates to a tubular falling film evaporator.

Background

The basic principle of the existing production control technology of the multi-effect tube type falling film evaporator is that materials in the evaporator are pumped into a film distributor by a circulating pump, after being distributed by the film distributor, the materials uniformly flow downwards along the inner wall of a heating tube in a film shape under the action of gravity and airflow and simultaneously exchange heat with heating steam in a heating chamber outside the heating tube, the solution absorbs heat and evaporates, the evaporated secondary steam is used as a heating source to the next effect, and the steam in the heating chamber condenses into water after exchanging heat with stock solution. The steam is utilized for multiple times, so that the steam water consumption is lower.

The film distributor is one of important devices of the multi-effect tube type falling film evaporator, and the film distributor is used for uniformly distributing liquid to be evaporated into a heating tube bundle of the tube type evaporator for evaporation. The materials in the tube pass enter the heat exchange tube from the tube top and are required to be subjected to film distribution through the film distributor before entering the heat exchange tube, so that the materials can be in a film shape when entering the heat exchange tube, and moisture is evaporated in the process of the materials from top to bottom, thereby achieving the purpose of material concentration.

The existing film distributor cannot ensure that thousands of heating pipes can uniformly distribute films due to the limitation of positions and structures. In actual production practice, as the service time is prolonged, the heat exchange effect of the falling film evaporator is gradually attenuated, so that the operation effect of the evaporator is far away from a design value, the steam consumption is increased, the productivity is reduced, and the operation cost is increased; meanwhile, uneven film distribution also easily causes scabbing of the heating pipe, and even local overheating and blocking become dead eyes. In general, the blockage rate of the heating pipe can reach 20% -30% every three years, and the heating pipe needs to be overhauled or replaced to influence the production efficiency, so that the problem of scabbing or blockage easily caused by uneven film distribution in the prior art exists.

Disclosure of Invention

The utility model aims to at least solve the problem of uneven cloth film. The aim is achieved by the following technical scheme:

the utility model provides a tubular falling film evaporator which comprises an evaporation tank, a film distribution device and a heating pipe, wherein the film distribution device and the heating pipe are arranged in the evaporation tank, the film distribution device comprises a main body and a fixed ring, the fixed ring is connected with the heating pipe, the main body is provided with a flow guide surface, a flow guide channel is formed between at least the flow guide surface and the fixed ring, and the flow guide channel is used for guiding materials to flow to the inner wall of the heating pipe to form a film.

According to the tubular falling film evaporator provided by the embodiment of the utility model, the film distribution device and the heating pipe are arranged in the evaporation tank, the film distribution device is connected with the heating pipe through the fixed ring, meanwhile, the diversion surface is arranged on the main body, when materials enter the evaporation tank and flow to the film distribution device, the materials can flow along the diversion surface according to the set direction, and then enter the heating pipe through the diversion channel between the diversion surface and the fixed ring to form a film for heat exchange, and the materials can flow into the heating pipe more accurately through the corresponding connection of the film distribution device and the heating pipe, so that the uniformity of film distribution is improved, meanwhile, the diversion surface is arranged on the film distribution device, the diversion channel is utilized to guide the materials to flow, so that the uniformity of film distribution is further improved, and the problem of uneven film distribution in the prior art is solved.

In addition, the tubular falling film evaporator provided by the embodiment of the utility model can also have the following technical characteristics:

in some embodiments of the present utility model, the fixing ring is sleeved on the top of the heating pipe, and the inner circumferential surface of the fixing ring is in sealing fit with the outer wall of the heating pipe.

In some embodiments of the present utility model, the main body includes an upper cone, a connecting rod, and a lower cone connected in sequence, and the retainer ring is provided at the periphery of the main body and connected to the upper cone through a bracket.

In some embodiments of the utility model, the upper cone is located above the retaining ring and outside the heating tube, and an outer side of the upper cone is recessed inward to form a first flow guiding surface.

In some embodiments of the utility model, a diversion channel is configured between the first diversion surface and the fixed ring, and at least part of the material can flow to the inner wall of the heating pipe along the diversion channel.

In some embodiments of the utility model, the lower cone is located below the fixing ring and within the heating tube, and an outer side surface of the lower cone is configured to be concavely recessed to form a second guide surface.

In some embodiments of the utility model, the second guide surface is used to guide a portion of the material flowing along the upper cone to the lower cone and to enable the material to be sputtered onto the inner wall of the heating tube.

In some embodiments of the utility model, the tube falling film evaporator further comprises a feed inlet disposed at the top of the evaporation tank and a distribution tray disposed between the feed inlet and the film distribution device.

In some embodiments of the utility model, the distribution tray is provided with a plurality of layers, the plurality of layers being arranged in a vertical direction, the radial dimensions of the plurality of layers increasing from top to bottom.

In some embodiments of the utility model, the tube-type falling film evaporator further comprises a tube plate, wherein a plurality of heating tubes are arranged, and the tube plate is provided with a plurality of mounting holes matched with the heating tubes.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures.

In the drawings:

FIG. 1 is a schematic view of a tube falling film evaporator according to an embodiment of the present utility model;

FIG. 2 is a schematic structural view of a film distributing device in the tube type falling film evaporator shown in FIG. 1;

fig. 3 is a partial cross-sectional view of a film distribution device and a heating tube in the tube type falling film evaporator shown in fig. 1.

The various references in the drawings are as follows:

1. a feed inlet; 2. an evaporation tank; 3. a distribution tray; 4. a film distribution device; 5. a tube sheet; 6. heating pipes; 7. an upper cone; 8. a bracket; 9. a fixing ring; 10. a connecting rod; 11. and a lower cone.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

As shown in fig. 1 to 3, an embodiment of the present utility model provides a tube type falling film evaporator, which includes an evaporation tank 2, a film distribution device 4 and a heating tube 6, wherein the film distribution device 4 and the heating tube 6 are disposed in the evaporation tank 2, the film distribution device 4 includes a main body and a fixing ring 9, the fixing ring 9 is connected with the heating tube 6, the main body has a guiding surface, at least a guiding channel is configured between the guiding surface and the fixing ring 9, and the guiding channel is used for guiding a material to flow to an inner wall of the heating tube 6 to form a film.

In the tubular falling film evaporator provided by the embodiment of the utility model, the film distribution device 4 and the heating pipe 6 are arranged in the evaporation tank 2, the film distribution device 4 is connected with the heating pipe 6 through the fixing ring 9, meanwhile, the main body is provided with the flow guide surface, when materials enter the evaporation tank 2 and flow to the film distribution device 4, the materials can flow along the flow guide surface according to a set direction, and further enter the heating pipe 6 through the flow guide channel between the flow guide surface and the fixing ring 9 to form films for heat exchange, and the tubular falling film evaporator provided by the embodiment enables the materials to flow into the heating pipe 6 more accurately by correspondingly connecting the film distribution device 4 and the heating pipe 6, so that the uniformity of film distribution is improved, meanwhile, the flow guide surface is arranged on the film distribution device 4, the flow guide channel is utilized to guide the materials, and the flow to the inner wall of the heating pipe 6 is normalized, so that the uniformity of film distribution is further improved, and the problem of uneven film distribution in the prior art is solved.

As shown in fig. 1, in this embodiment, the number of heating pipes 6 is plural, and correspondingly, the film distributing devices 4 correspondingly connected to the heating pipes 6 are also plural, and each film distributing device 4 may be correspondingly connected to one heating pipe 6, so that it is able to ensure that the materials flowing into each heating pipe 6 are uniformly distributed, and in this embodiment, the specific structures of the heating pipes 6 and the film distributing devices 4 are described in detail in the following embodiments.

In some embodiments of the utility model, the tube falling film evaporator further comprises a feed inlet 1 and a distribution tray 3, wherein the feed inlet 1 is arranged at the top of the evaporation tank 2, and illustratively, the top of the evaporation tank 2 is integrally provided with an opening, which can be used as the feed inlet 1, and the feed inlet 1 is used for allowing evaporated liquid material to flow into the evaporation tank 2. The distribution plate 3 is arranged in the evaporation tank 2 and is positioned between the feed inlet 1 and the film distribution device 4, and the distribution plate 3 makes the material splash in the direction of the heating pipe 6 by contacting with the material entering the evaporation tank 2, so that the material flows into the heating pipe 6 for heat exchange.

With continued reference to fig. 1, in some embodiments of the present utility model, the distribution plate 3 is provided with multiple layers, the multiple layers of distribution plates 3 are arranged in a vertical direction and can be connected by a support structure, and during the downward flow of the material, multiple splashing flows are realized through the multiple layers of distribution plates 3 in sequence, so that the material flows into more heating pipes 6 more widely for film formation and heat exchange. In an alternative embodiment, the radial dimensions of the multi-layered distribution tray 3 are gradually increased from top to bottom to ensure adequate splash flow of the downwardly flowing material. In this embodiment, the distribution plate 3 may be provided with two layers, three layers or more, and the number of layers of the distribution plate 3 in this embodiment is not particularly limited, and may be set according to actual requirements.

Further, with continued reference to FIG. 1, in some embodiments of the utility model, the tube-type falling film evaporator further comprises a tube sheet 5, the tube sheet 5 in this embodiment being adapted to provide support for the heating tubes 6 and to receive material flowing down from the distributor tray 3. The tube plate 5 is installed in the evaporation tank 2 and is located below the distribution tray 3, in this embodiment, the tube plate 5 is provided with a plurality of mounting holes, and according to the above embodiment, the heating tubes 6 are provided in a plurality, and the plurality of heating tubes 6 are respectively in one-to-one correspondence with and matched with the plurality of mounting holes, so as to be installed in the tube plate 5.

Further, referring to fig. 2, in some embodiments of the present utility model, the main body includes an upper cone 7, a connecting rod 10 and a lower cone 11 connected in sequence, and a fixing ring 9 is disposed around the outer periphery of the main body and connected to the upper cone 7 through a bracket 8. In this embodiment, the upper cone 7, the connecting rod 10 and the lower cone 11 may be configured as an integrally formed structure, and may also be sequentially connected by welding or the like, and the fixing ring 9 is configured as an annular shape and located at the periphery of the main body, and the main body and the fixing ring 9 may be coaxially disposed, and the support 8 includes a plurality of struts connected between the upper cone 7 and the fixing ring 9, where the plurality of struts may be uniformly arranged around the axis of the upper cone 7, so as to ensure the reliability and stability of the connection.

In an alternative embodiment, as shown in fig. 2, the fixing ring 9 includes a ring body and fixing teeth, where the fixing teeth are disposed at a bottom end of the ring body and are disposed in a circumferential arrangement, and the fixing teeth and the ring body may be provided as an integrally formed structure, for example. The fixing teeth are used in this embodiment for connection with the heating tube 6. As shown in fig. 3, in some embodiments of the present utility model, the inner diameter of the fixing ring 9 is larger than the outer diameter of the heating tube 6, the fixing ring 9 is sleeved on the top of the heating tube 6, and the inner circumferential surface of the fixing ring 9 is in sealing fit with the outer wall of the heating tube 6, for example, the fixing teeth can be pressed by inward pressurizing on the basis that the fixing ring 9 is sleeved on the top of the heating tube 6, so that the fixing ring 9 is fixedly connected with the heating tube 6, and the film distribution device 4 is connected with the heating tube 6, and the connection direction ensures the connection reliability.

In some embodiments of the present utility model, referring to fig. 1 to 3 in combination, the material flows in the direction indicated by the arrow in fig. 1, the upper cone 7 is located above the fixing ring 9 and outside the heating pipe 6, the tip end of the upper cone 7 is connected to the connecting rod 10, that is, the upper cone 7 is disposed upside down, and further, the outer side surface of the upper cone 7 is recessed inward to form a curved surface, thereby forming a first guiding surface for guiding the material flow.

As shown in fig. 1 and 2, on the basis of the above embodiment, a diversion channel is formed between the first diversion surface and the fixing ring 9, at least part of the material can flow to the inner wall of the heating pipe 6 along the diversion channel, it can be understood that when the material flows down through the last layer of distribution plate 3, most of the material falls on the concave part of the tube plate 5, i.e. the surface of the tube plate 5, the material accumulates to form a liquid level, and along with the rising of the liquid level, the material flows into the heating pipe 6 under the guidance of the first diversion surface and the fixing ring 9, i.e. most or all of the material gradually flows into the heating pipe 6 along the diversion channel, and because the fixing ring 9 is in sealing fit with the heating pipe 6, the part of the material can flow down along the inner wall of the heating pipe 6, thereby realizing film distribution and heat exchange.

Further, referring to fig. 1 to 3, in some embodiments of the present utility model, the lower cone 11 is located below the fixing ring 9 and is located in the heating tube 6, the tip end of the lower cone 11 is connected to the connecting rod 10, and the outer side of the lower cone 11 is recessed inward to form a curved surface, so as to form a second guiding surface for guiding the flow of the material. The second guide surface in this embodiment is used to guide part of the material flowing along the upper cone 7 to the lower cone 11 and to enable the material to sputter onto the inner wall of the heating tube 6.

As shown in fig. 1 and fig. 2, on the basis of the above embodiment, most or all materials gradually flow onto the inner wall of the heating pipe 6 along the diversion channel, and a small part of materials flow along the main body, that is, may flow to the lower cone 11 along the upper cone 7 and the connecting rod 10, in this embodiment, the lower cone 11 is disposed in the heating pipe 6, and meanwhile, the second diversion surface is disposed on the lower cone 11, so that the materials flowing onto the lower cone 11 can splash onto the inner wall of the heating pipe 6 in an arc shape under the action of gravity and the second diversion surface, so as to meet other materials and distribute films, thereby the arrangement of the second diversion surface further ensures that the materials fully flow onto the inner wall of the heating pipe 6, and further flow downward in a film shape.

According to the above embodiment, the tubular falling film evaporator provided in this embodiment, through constructing the first guide surface, the second guide surface and the guide channel in the film distribution device 4, the material can fully enter the heating pipe 6 by using the mode that the film distribution device 4 is correspondingly connected with the heating pipe 6, and meanwhile, the material can be guided to flow along the inner wall of the heating pipe 6, so that the uniformity of film distribution is improved, the possibility of scabbing or blocking of the heating pipe 6 is further reduced, and the heat exchange effect of the tubular falling film evaporator is greatly improved by fully exchanging heat between the inner wall of the heating pipe 6 and steam outside the pipe.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a tubular falling film evaporator, its characterized in that includes evaporation tank, cloth membrane device and heating pipe, cloth membrane device with the heating pipe sets up in the evaporation tank, cloth membrane device includes main part and solid fixed ring, gu fixed ring with the heating pipe is connected, the main part has the water conservancy diversion face, the water conservancy diversion face at least with gu construct the water conservancy diversion passageway between the fixed ring, the water conservancy diversion passageway is used for guiding the material flow to the inner wall of heating pipe is in order to form a film.

2. The tube type falling film evaporator according to claim 1, wherein the fixing ring is sleeved on the top of the heating tube, and the inner peripheral surface of the fixing ring is in sealing fit with the outer wall of the heating tube.

3. The tube type falling film evaporator according to claim 1, wherein the main body comprises an upper cone, a connecting rod and a lower cone which are sequentially connected, and the fixing ring is arranged at the periphery of the main body and is connected with the upper cone through a bracket.

4. A tube type falling film evaporator according to claim 3, wherein the upper cone is located above the fixing ring and outside the heating tube, and an outer side surface of the upper cone is recessed inward to form a first guide surface.

5. The tube-type falling film evaporator according to claim 4, wherein a diversion channel is formed between the first diversion surface and the fixed ring, and at least part of the material can flow to the inner wall of the heating tube along the diversion channel.

6. The tube type falling film evaporator according to claim 5, wherein the lower cone is located below the fixing ring and inside the heating tube, and an outer side surface of the lower cone is arranged to be concave inward to form a second guide surface.

7. The tube type falling film evaporator according to claim 6, wherein the second guide surface is used for guiding part of materials flowing along the upper cone to the lower cone and enabling the materials to be sputtered to the inner wall of the heating tube.

8. The tube type falling film evaporator according to any one of claims 1 to 7, further comprising a feed inlet provided at a top of the evaporation tank and a distribution tray provided between the feed inlet and the film distribution device.

9. The tube type falling film evaporator according to claim 8, wherein the distribution tray is provided with a plurality of layers, the plurality of layers of the distribution tray are arranged in a vertical direction, and radial dimensions of the plurality of layers of the distribution tray are gradually increased from top to bottom.

10. The tube type falling film evaporator according to claim 8, further comprising a tube sheet, wherein the heating tube is provided in plurality, and wherein the tube sheet is provided with a plurality of mounting holes that mate with the heating tube.