CN217275714U

CN217275714U - Block hole type heat exchanger and heat exchange system

Info

Publication number: CN217275714U
Application number: CN202220837744.9U
Authority: CN
Inventors: 周天宇; 张婧帆; 李玖重; 孙志钦; 郜建松; 王恒博; 苏耀伦; 李晓睿
Original assignee: China Petroleum and Chemical Corp; Sinopec Engineering Group Co Ltd
Current assignee: China Petroleum and Chemical Corp; Sinopec Engineering Group Co Ltd
Priority date: 2022-04-12
Filing date: 2022-04-12
Publication date: 2022-08-23
Anticipated expiration: 2032-04-12

Abstract

The application provides a block-hole type heat exchanger and a heat exchange system, and relates to the technical field of petrochemical equipment. The block-hole heat exchanger comprises a heat exchanger shell and a heat exchange core arranged in the heat exchanger shell, wherein a static mixing structure is arranged in a gas pore passage of the heat exchange core, and the static mixing structure comprises helical blades extending along the length direction of the gas pore passage. The heat exchange system comprises the block-hole type heat exchanger. The application provides a block hole formula heat exchanger, owing to be provided with static mixed structure in the gas pore, consequently this heat exchanger's heat transfer coefficient is high.

Description

Block hole type heat exchanger and heat exchange system

Technical Field

The utility model relates to a petrochemical equipment technical field particularly, relates to a block hole formula heat exchanger and heat transfer system.

Background

At present, an air preheater used in a heating furnace in the petrochemical industry is generally made of metal materials, the exhaust gas temperature is generally 120-150 ℃, the comprehensive thermal efficiency of the heating furnace is about 90-92%, and the bottleneck of further reducing the exhaust gas temperature of the heating furnace and improving the thermal efficiency is mainly low-temperature dew point corrosion of the exhaust gas. If non-metal corrosion-resistant materials (such as graphite, ceramic and the like) are adopted as the heat exchange core body, the exhaust gas temperature can be further reduced to below 85 ℃, and the comprehensive heat efficiency of the heating furnace is improved to above 95%. Non-metal corrosion-resistant materials such as ceramics, graphite and the like belong to brittle materials, and stress brittle failure is easy to occur when the materials are processed into the traditional tube type heat exchanger, so the materials are often processed into a block hole type heat exchanger in practical application. However, the wall thickness of the block-hole heat exchanger is heavy, a layer of retained inner layer exists on the inner side of the pipe wall in the heat exchange process, the thermal resistance is very large, the heat exchange coefficient is small, and the volume of the non-metal block-hole heat exchanger is 20-60% larger than that of the traditional metal heat exchanger under the same heat exchange effect. Therefore, the block-hole heat exchanger occupies a large area, and has limited application due to high investment cost.

In view of this, the present application is specifically made.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a block cellular type heat exchanger and heat transfer system, it can increase heat transfer coefficient.

The embodiment of the utility model is realized like this:

in a first aspect, the utility model provides a block cellular type heat exchanger, include the heat exchanger casing and set up the heat transfer core in the heat exchanger casing, be provided with static mixed structure in the gas duct of heat transfer core, static mixed structure includes the helical blade who extends along gas duct length direction.

In an alternative embodiment, the gas passages include a plurality of hot source gas passages and a plurality of cold source gas passages, the plurality of hot source gas passages and the plurality of cold source gas passages are staggered, and a static mixing structure is disposed in each of the hot source gas passages and the cold source gas passages.

In an alternative embodiment, the spiral vane positioned in the heat source gas channel has the same length as that of the heat source gas channel, and the spiral vane positioned in the cold source gas channel has the same length as that of the cold source gas channel.

In an alternative embodiment, the static mixing structure further comprises a central shaft, the static mixing structure is composed of the central shaft and a helical blade, the helical blade is connected with the central shaft, and the central axis of the helical blade coincides with the central shaft.

In an alternative embodiment, the outer diameter of the helical blade is 1-10 mm smaller than the inner diameter of the gas channel.

In an alternative embodiment, the pitch of the helical blade is 1 to 20 times its outer diameter.

In optional embodiment, one side of heat exchanger casing is provided with cold source gas inlet and cold source gas outlet, and the heat transfer core is provided with a plurality of cold source gas inlet pore canals and a plurality of cold source gas exhaust pore canals, cold source gas inlet and the one end intercommunication in every cold source gas inlet pore canal, the other end in every cold source gas inlet pore canal and the one end intercommunication in every cold source gas exhaust pore canal, the other end and the cold source gas outlet intercommunication in every cold source gas exhaust pore canal.

In an alternative embodiment, a heat source gas inlet is arranged on one side of the heat exchanger shell, a heat source gas outlet is arranged on the opposite side of the heat exchanger shell, the heat exchange core is provided with a plurality of heat source gas channels with two ends penetrating through, and two opposite ends of each heat source gas channel are respectively communicated with the heat source gas inlet and the heat source gas outlet.

In a second aspect, the present invention provides a heat exchange system comprising a block and hole heat exchanger as in any one of the previous embodiments.

The embodiment of the utility model provides a beneficial effect is:

this application obtains through above-mentioned design's block hole heat exchanger, because set up the static mixed structure who has the helical blade who extends along its length direction in gas duct, back in gas admission gas duct, its flow state is disturbed under helical blade's effect, the laminar flow boundary layer of duct inner wall is destroyed, make the flow state in the duct reach abundant torrent, promote the heat exchange between the fluid and the heat exchange core in the duct, reduce the thermal resistance, increase heat transfer coefficient, and then reach the purpose that improves cold source and heat source heat exchange efficiency, under the condition of the same heat transfer volume, the heat transfer equipment volume of this application is littleer.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a block-hole heat exchanger according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a heat exchange core in a block-and-hole heat exchanger according to an embodiment of the present invention;

FIG. 3 is a first schematic diagram of a static mixing structure disposed within a heat exchange core;

fig. 4 is a schematic diagram of a second structure of a static mixing structure arranged in the heat exchange core body.

100-block hole type heat exchanger; 110-a heat exchanger shell; 111-cold source gas inlet; 112-cold source gas outlet; 113-heat source gas inlet; 114-heat source gas outlet; 120-a heat exchange core; 130-gas channels; 131-a heat source gas channel; 132-cold source gas channel; 132 a-cold source gas inlet port; 132 b-cold source gas exhaust channel; 140-static mixing structure; 141-a central axis; 142-helical blades.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 4, the present embodiment provides a block-and-hole heat exchanger 100, which includes a heat exchanger shell 110 and a heat exchange core 120 disposed in the heat exchanger shell 110, wherein a static mixing structure 140 is disposed in a gas duct 130 of the heat exchange core 120, and the static mixing structure 140 includes a helical blade 142 extending along a length direction of the gas duct 130.

In the block-hole heat exchanger 100 provided in this embodiment, because the static mixing structure 140 having the helical blade 142 extending along the length direction is disposed in the gas duct 130, after the gas enters the gas duct 130, the flow state of the gas is disturbed under the action of the helical blade 142, and the laminar boundary layer of the inner wall of the duct is destroyed, so that the flow state in the duct reaches sufficient turbulence, thereby promoting the heat exchange between the fluid in the duct and the heat exchange core 120, increasing the heat exchange coefficient, and further achieving the purpose of improving the heat exchange efficiency of the cold source and the heat source.

Further, the static mixing structure 140 may have two forms in the present application, one is a non-central-shaft 141 type, and the static mixing structure 140 is a helical blade 142. The other is a type having a central shaft 141, the static mixing structure 140 is composed of a central shaft 141 and a helical blade 142, the helical blade 142 is connected to the central shaft 141, and the central axis of the helical blade 142 coincides with the central shaft 141.

Further, the opposite ends of the static mixing structure 140 may be fixed to the heat exchange core 120 by welding or punching and binding.

Specifically, the gas passages 130 include a plurality of hot source gas passages 131 and a plurality of cold source gas passages 132, the plurality of hot source gas passages 131 and the plurality of cold source gas passages 132 are interleaved, and the static mixing structure 140 is disposed in each of the hot source gas passages 131 and the cold source gas passages 132.

High-temperature gas (such as high-temperature flue gas) is introduced into the heat source gas pore channels 131, low-temperature gas (such as air) is introduced into the cold source gas pore channels 132, the high-temperature gas and the low-temperature gas enter the gas pore channels 130 to exchange heat by taking the heat exchange core body 120 as a medium, and the heat source gas and the cold source gas can be fully exchanged heat by arranging the plurality of heat source gas pore channels 131 and the plurality of cold source gas pore channels 132 in a staggered manner.

Further, the length of the spiral blade 142 positioned in the heat source gas hole 131 is the same as that of the heat source gas hole 131, and the length of the spiral blade 142 in the cool source gas hole 132 is the same as that of the cool source gas hole 132.

When the gas reaches the position where the spiral blade 142 is arranged after entering the hole, the turbulent flow is realized under the action of the spiral blade 142, and when the length of the spiral blade 142 is the same as that of the gas hole 130, the gas just enters the gas hole 130 and meets the spiral blade 142, so that the turbulent flow is realized immediately.

Further, in order to facilitate the assembly of the static mixing structure 140, and the gas can smoothly enter the gas duct 130, the outer diameter of the helical blade 142 is 1-10 mm smaller than the inner diameter of the gas duct 130.

Further, the pitch of the helical blade 142 is 1 to 20 times of the outer diameter thereof.

The pitch is: the distance between two adjacent threads measured in the direction of the helix. Generally refers to the axial distance between two points on the pitch diameter corresponding to two adjacent teeth on the thread. For example, if the inner diameter of the gas duct 130 is 25mm and the outer diameter of the spiral blade 142 is 24mm, the pitch is 24 × (1-20) mm, and the number of turns is the ratio of the length of the spiral blade 142 to the pitch (rounded down).

Further, one side of the heat exchanger housing 110 is provided with a cold source gas inlet 111 and a cold source gas outlet 112, the heat exchange core 120 is provided with a plurality of cold source gas inlet channels 132a and a plurality of cold source gas outlet channels 132b, the cold source gas inlet 111 is communicated with one end of each cold source gas inlet channel 132a, each of the other ends of the cold source gas inlet channels 132a is communicated with one end of each cold source gas outlet channel 132b, and the other end of each cold source gas outlet channel 132b is communicated with the cold source gas outlet 112.

The cold source gas with a lower temperature enters the block-and-hole heat exchanger 100 from the cold source gas inlet 111, then enters the hole channel 132a, directly exchanges heat with the heat exchange core 120 in the hole channel (equivalent to indirect heat exchange with the heat source gas), then enters the hole channel 132a from the cold source gas and is discharged, then is baffled to enter the cold source gas discharge hole channel 132b, continuously exchanges heat in the cold source gas discharge hole channel 132b, and finally the cold source gas with an increased temperature is discharged from the cold source gas outlet 112 communicated with the cold source gas discharge hole channel 132 b. The whole process is double-pass heat exchange.

Further, a heat source gas inlet 113 is disposed at one side of the heat exchanger housing 110, a heat source gas outlet 114 is disposed at the opposite side, the heat exchange core 120 is provided with a plurality of heat source gas channels 131 having two ends penetrating therethrough, and two opposite ends of each heat source gas channel 131 are respectively communicated with the heat source gas inlet 113 and the heat source gas outlet 114.

The hot source gas with higher temperature enters the block-hole heat exchanger 100 from the heat source gas inlet 113, then enters the hot source gas pore canal 131, directly exchanges heat with the heat exchange core 120 in the heat source gas pore canal 131 (equivalent to indirectly exchanging heat with the cold source gas), and the temperature is reduced after heat exchange, and the hot source gas is discharged from the heat source gas outlet 114. The whole process is single-pass heat exchange.

A more specific example is provided below to illustrate the block-and-hole heat exchanger 100 provided herein.

Fig. 1 and fig. 2 are respectively a schematic diagram of a steel structure of the ceramic block-and-hole heat exchanger 100 and a schematic diagram of a heat exchange core 120. The high temperature flue gas (as heat source) and the normal temperature air (as cold source) exchange heat through the ceramic block-and-hole heat exchanger 100. Wherein the heat source gas pore canal 131 adopts a single-pass mode, the number of the heat source gas pore canals 131 is 168, the length of the pore canal is 100cm, and the aperture is phi 25 mm; the cold source gas channels 132 adopt double-pass, the number of the cold source gas channels 132 is 207 multiplied by 2, and the length of the channels is 86 cm. The aperture is phi 16 mm. A static mixing structure 140 having no central shaft 141 as shown in fig. 3 is inserted into each of the heat source gas channels 131 and the cold source gas channels 132, and both ends of the static mixing structure 140 are perforated and fixed to the heat exchanging core 120 by wire bonding. Wherein the outer diameter of the static mixing structure 140 placed in the hot source gas channel 131 is 24mm, the thread pitch is 5 times of the outer diameter, namely 120mm, and the number of thread turns is 8; the static mixing structure 140 in which the cold source gas hole 132 is placed has an outer diameter of 15mm and a pitch of 6 times the outer diameter, i.e., 90mm, and the number of turns of the screw is 9. After the static mixing structure 140 is added to the channel of the heat exchange core 120, the flow of the fluid in the channel is disturbed, and the laminar boundary layer is destroyed, so that the flowing state reaches sufficient turbulence, and the heat exchange between the flue gas and the medium in the cold source gas channel 132 is promoted. The total heat exchange coefficient of the heat exchanger is calculated to be 31W/(m) ² K) increased to 50W/(m) ² K), the heat exchange capacity of the block-hole heat exchanger 100 is improved by 60% under the condition that the heat exchange area is not changed.

In summary, according to the block-hole heat exchanger provided by the application, the static mixing structure with the helical blades extending along the length direction is arranged in the gas duct, after the gas enters the gas duct, the flow state of the gas is disturbed under the action of the helical blades, and the laminar boundary layer of the inner wall of the duct is damaged, so that the flowing state in the duct reaches sufficient turbulence, the heat exchange between the fluid in the duct and the heat exchange core is promoted, the thermal resistance is reduced, the heat exchange coefficient is increased, the purpose of improving the heat exchange efficiency of the cold source and the heat source is further achieved, and under the condition of the same heat exchange quantity, the heat exchange equipment has a smaller volume.

The application also provides a heat exchange system, which comprises the block-hole heat exchanger provided by the embodiment of the application.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A block-hole type heat exchanger is characterized by comprising a heat exchanger shell and a heat exchange core body arranged in the heat exchanger shell, wherein a static mixing structure is arranged in a gas pore passage of the heat exchange core body, and the static mixing structure comprises spiral blades extending along the length direction of the gas pore passage.

2. The block and hole heat exchanger of claim 1, wherein the gas channels comprise a plurality of hot source gas channels and a plurality of cold source gas channels, the plurality of hot source gas channels interleaved with the plurality of cold source gas channels, the hot source gas channels and the cold source gas channels both having the static mixing structure disposed therein.

3. A block and hole heat exchanger according to claim 2 wherein the length of the helical blade within the hot source gas tunnel is the same as the length of the hot source gas tunnel and the length of the helical blade within the cold source gas tunnel is the same as the length of the cold source gas tunnel.

4. A block and hole heat exchanger according to claim 1, wherein the static mixing structure further comprises a central shaft, the static mixing structure being formed by the central shaft and the helical blade, the helical blade being connected to the central shaft, and the central axis of the helical blade coinciding with the central shaft.

5. The block-and-hole heat exchanger of claim 1, wherein the outer diameter of the helical blade is 1 to 10mm smaller than the inner diameter of the gas duct.

6. A block and hole heat exchanger according to claim 5, wherein the pitch of the helical blades is 1 to 20 times its outer diameter.

7. The block-hole heat exchanger according to claim 1, wherein a cold source gas inlet and a cold source gas outlet are provided at one side of the heat exchanger housing, the heat exchange core is provided with a plurality of cold source gas inlet holes and a plurality of cold source gas outlet holes, the cold source gas inlet is communicated with one end of each cold source gas inlet hole, the other end of each cold source gas inlet hole is communicated with one end of each cold source gas outlet hole, and the other end of each cold source gas outlet hole is communicated with the cold source gas outlet.

8. The block-and-hole heat exchanger as claimed in claim 1, wherein one side of the heat exchanger shell is provided with a heat source gas inlet, the other opposite side is provided with a heat source gas outlet, the heat exchange core is provided with a plurality of heat source gas channels with two ends penetrating, and the two opposite ends of each heat source gas channel are respectively communicated with the heat source gas inlet and the heat source gas outlet.

9. A heat exchange system comprising a block and hole heat exchanger according to any one of claims 1 to 8.