CN218620913U

CN218620913U - Heat exchanger

Info

Publication number: CN218620913U
Application number: CN202222819402.7U
Authority: CN
Inventors: 黄伟; 杨源满; 徐长虹; 张风坡; 穆怀萍
Original assignee: Capital Engineering & Research Inc Ltd; Ceri Environmental Protection Techonology Co Ltd
Current assignee: Capital Engineering & Research Inc Ltd; Ceri Environmental Protection Techonology Co Ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-03-14
Anticipated expiration: 2032-10-25

Abstract

The utility model discloses a heat transfer device relates to steelmaking technical field, heat transfer device includes: the evaporation heat exchangers are sequentially communicated, an inlet flue is arranged on the evaporation heat exchanger positioned at the most upstream, and an outlet flue is arranged on the evaporation heat exchanger positioned at the most downstream; the transition flue is arranged between the adjacent evaporation heat exchangers, and the transition flue is provided with a dust cleaning device; the range of the transverse relative tube distance s1/d of a heated tube of a convection heat exchange surface in the evaporation heat exchanger is 3-4; the longitudinal relative tube spacing s2/d of the heated tube is in the range of 2 to 3, d representing the diameter of the heated tube. The problem that heated tubes in a heat exchange device are easy to accumulate dust and how to effectively clean the dust can be solved.

Description

Heat exchanger

Technical Field

The utility model relates to a steelmaking technical field, in particular to a heat exchange device.

Background

At present, the cooling process of low-temperature coal gas in steel-making converters at home and abroad generally adopts the following two methods: wet (OG) and semi-dry (LT, DDS) dedusting systems. The two methods are both characterized in that water is sprayed into the coal gas or a mixture of steam and water is sprayed, the phase change of the water is utilized to absorb the heat of the flue gas, the nature of the method is 'wet method', so that a large amount of sensible heat in the converter coal gas cannot be utilized, the energy is wasted, the consumption of the water and the steam is increased, the moisture content of the coal gas is large, and the quality of the coal gas is influenced.

In recent years, industry related personnel have made some researches and experiments on the utilization of the waste heat of medium-low temperature coal gas, but some problems which are not completely solved exist more or less, so that the large-scale popularization and the large-scale use of the waste heat of the medium-low temperature coal gas are not achieved. For example, a certain developed converter heat exchange device can realize flue gas cooling and recover low-temperature flue gas waste heat. But multiple times of blasting occur in the production process, and the blasting is performed once a week in average during the use period. Multiple burning and explosion damage the electric field of the electric dust collector, so that the dust content at the outlet of the chimney does not reach the standard and is about 100mg/m ³ . Meanwhile, the flue gas at the outlet of the flue contains more dust, and no effective measures are taken to treat the smoke dust, so that the dust deposition inside the heat exchange device is serious. The heat exchange device adopts a square box type circulation section + opposite-insertion type heat pipe heat exchange surface structure, although the heat exchange structure has vapor-water circulation outside a flue gas channel, a single heat pipeThe damage does not affect the steam-water circulation. However, the heat exchanger has the defects that heat exchange elements of the heat pipes are easy to lose effectiveness, and the finned pipes adopted by the heat exchange pipe bundles are easy to accumulate dust, so that the problems of easy dust accumulation and how to perform dust removal need to be solved.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above-mentioned defect of prior art, the embodiment of the utility model provides a technical problem that will solve provides a heat transfer device, and it can solve the easy deposition of heated tube among the heat transfer device and how to its effectual problem of carrying out the deashing.

The embodiment of the utility model provides a concrete technical scheme is:

a heat exchange device, comprising:

the evaporation heat exchangers are sequentially communicated, an inlet flue is arranged on the evaporation heat exchanger positioned at the most upstream, and an outlet flue is arranged on the evaporation heat exchanger positioned at the most downstream;

the transition flue is arranged between the adjacent evaporation heat exchangers, and the transition flue is provided with an ash removal device;

the range of the transverse relative tube distance s1/d of a heated tube of a convection heat exchange surface in the evaporation heat exchanger is 3-4; the heated tube longitudinal relative tube spacing s2/d ranges from 2 to 3, d representing the heated tube diameter.

Preferably, a plurality of the evaporation heat exchangers and the transition flue are in a modular structure and are arranged in a stacking manner.

Preferably, the ash removal device comprises a nitrogen shock wave pulse ash removal device and/or a sound wave ash removal device.

Preferably, the number of the nitrogen shock wave pulse ash removal devices and the number of the sound wave ash removal devices are two respectively;

the first nitrogen shock wave pulse ash removal device and the first sound wave ash removal device are symmetrically arranged on two sides of the transition flue; the second nitrogen shock wave pulse ash removal device and the second sound wave ash removal device are symmetrically arranged on two sides of the transition flue; the first nitrogen shock wave pulse ash removal device and the second sound wave ash removal device are positioned on the same side; the second nitrogen shock wave pulse ash removal device and the first sound wave ash removal device are positioned on the same side.

Preferably, a plurality of the evaporative heat exchangers and the transition flues are stacked in a vertical direction to form a vertical single-smoke box structure.

Preferably, the evaporative heat exchanger includes: the water inlet header and the water outlet header are respectively positioned on the opposite side walls of the evaporation heat exchanger and extend along the vertical direction; the plurality of water inlet branch pipes and the plurality of water outlet branch pipes extend along the direction vertical to the paper surface, are arranged along the vertical direction and are respectively positioned on the opposite side walls of the evaporation heat exchanger; the plurality of water inlet branch pipes are communicated with the water inlet header through the communicating pipe, and the plurality of water outlet branch pipes are communicated with the water outlet header through the communicating pipe; the water inlet branch pipes are connected with the corresponding water outlet branch pipes through one or more heated pipes, and the heated pipes penetrate through a flue of the evaporation heat exchanger; the plurality of heating pipes are arranged in the vertical direction and are arranged in the direction perpendicular to the paper surface.

Preferably, a plurality of said evaporative heat exchangers, and said transition flues are arranged in a linear stack.

Preferably, a manhole for maintenance personnel to enter and exit is formed in the transition flue.

Preferably, each heated tube in the evaporation heat exchanger adopts a single-pass structure which is not folded back by 180 degrees; the heated tubes in the evaporation heat exchanger are arranged in an inclined mode, and the inclined angle between the heated tubes and the horizontal plane is larger than or equal to 10 degrees.

Preferably, the heated tubes are arranged in a row; the heated tube adopts a light pipe.

The technical scheme of the utility model following beneficial effect is shown to have:

1. because the evaporation heat exchanger in the heat exchange device adopts a wide flow passage design, the range of the transverse relative tube spacing s1/d of the heated tube of the convection heat exchange surface in the evaporation heat exchanger is between 3 and 4, and the range of the longitudinal relative tube spacing s2/d of the heated tube is between 2 and 3. Under the structure, the contact surface of the flue gas in the flow channel of the evaporation heat exchanger 2 is less, so that the pressure loss is small, the fluid distribution is uniform, and the dust deposition between the tubes is not easy to form, thereby realizing the purpose of preventing the dust deposition to a certain extent.

2. Because the transition flue is provided with the ash removal device, the ash removal device can be used for conveniently carrying out ash removal operation on the adjacent evaporative heat exchangers above or below the ash removal device, so that the ash removal operation can be carried out on all the evaporative heat exchangers.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely illustrative for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art with the benefit of the teachings of this invention can select various possible shapes and proportional dimensions to implement the invention depending on the specific situation.

FIG. 1 is a schematic structural view of a heat exchange device in an embodiment of the present invention;

fig. 2 is a schematic sectional view of an evaporative heat exchanger according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view in the radial direction of an evaporative heat exchanger according to an embodiment of the present invention;

FIG. 4 is a schematic view of the connection of the heated tube in an embodiment of the present invention;

fig. 5 is a schematic structural view of the heated tube and the wear-resistant cover plate in the embodiment of the present invention.

Reference numerals of the above figures:

1. an inlet flue; 2. an evaporative heat exchanger; 3. a transition flue; 31. a dust removal device; 32. a manhole; 6. an outlet flue; 7. a steel frame; 8. an inner insulating layer; 9. a steel plate; 10. a water inlet header; 11. a water outlet header; 12. water inlet branch pipes; 13. a water outlet branch pipe; 14. a communicating pipe; 15. a heated tube; 16. an anti-abrasion cover plate; 17. and a cover plate fixing hoop.

Detailed Description

The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of explanation only, and should not be construed as limiting the invention in any way. Given the teachings of the present invention, the skilled person can conceive of any possible variants based on the invention, which should all be considered as belonging to the scope of the invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In order to solve the problem that the easily deposition of heated tube among the heat transfer device and how to its effectual deashing of carrying on, provided a heat transfer device in this application, figure 1 is the embodiment of the utility model provides an in heat transfer device's decoupling zero thigh sketch map, as shown in figure 1, heat transfer device can include: the evaporation heat exchangers 2 are sequentially communicated, an inlet flue 1 is arranged on the evaporation heat exchanger 2 positioned at the most upstream, and an outlet flue 6 is arranged on the evaporation heat exchanger 2 positioned at the most downstream; at least one transition flue 3, the filtering flue is arranged between the adjacent evaporation heat exchangers 2, and the transition flue 3 is provided with an ash cleaning device 31; the range of the transverse relative tube distance s1/d of a heated tube 15 of a convection heat exchange surface in the evaporation heat exchanger is between 3 and 4; the heated tube 15 has a longitudinal relative tube spacing s2/d in the range of 2 to 3, d representing the diameter of the heated tube 15.

As shown in fig. 1, the plurality of evaporation heat exchangers 2 are sequentially communicated, so that the flue gas sequentially passes through the plurality of evaporation heat exchangers 2, and the purpose of heat exchange is further achieved. Each of the evaporating heat exchangers 2 extends in the direction of its own axis, and the inlet and the outlet are located at both ends in the direction of the axis, respectively. The evaporation heat exchanger 2 is provided with an inlet flue 1, the inlet flue 1 is connected with an inlet of the most upstream evaporation heat exchanger 2, and the inlet of the inlet flue 1 can be positioned in the direction of the side wall of the inlet flue 1. The most downstream evaporative heat exchanger 2 has an outlet flue 6 thereon, and the outlet flue 6 may be connected to the outlet of the evaporative heat exchanger 2.

As shown in fig. 1, at least one filter stack may be disposed between adjacent evaporative heat exchangers 2. As a matter of course, the transition flue 3 may be a plurality of transition flues, and a plurality of transition flues 3 are respectively arranged between every two adjacent evaporative heat exchangers 2.

As a practical matter, the transition flue 3 is provided with a manhole 32 for maintenance personnel to enter and exit. Through the manhole 32, when the adjacent equipment of transition flue 3 goes wrong, thereby can be convenient through the transition flue 3 on manhole 32 entering of equipment below or below and maintain, improved the convenience of maintenance like this. When a plurality of transition flues 3 are respectively arranged between every two adjacent evaporation heat exchangers 2, all the evaporation heat exchangers 2 can be maintained through the transition flues 3. The transition flue 3 is provided with the ash removal device 31, and similarly, the ash removal device 31 can be used for conveniently removing ash from the adjacent evaporative heat exchangers 2 above or below the ash removal device 31, so that ash removal operation can be performed on all the evaporative heat exchangers 2.

The wide-runner design can be adopted for the evaporation heat exchanger 2 in the heat exchange device, and the range of the transverse relative pipe spacing s1/d of the heated pipe 15 of the convection heat exchange surface in the evaporation heat exchanger 2 is 3-4; the heated tube 15 has a longitudinal relative tube spacing s2/d in the range of 2 to 3, d representing the diameter of the heated tube 15. Further, the heated tubes 15 may be arranged in-line. Further, the heated pipe 15 may employ a light pipe. Under the structure, the contact surface of the flue gas in the flow channel of the evaporation heat exchanger 2 is less, so that the pressure loss is small, the fluid distribution is uniform, and the dust accumulation between the pipes is not easy to form, thereby realizing the purpose of preventing the dust accumulation to a certain extent. Of course, in other possible embodiments, a staggered arrangement between the heated tubes 15 may be used.

The ash removal device 31 may include a nitrogen shock pulse ash removal device 31 and/or a sonic ash removal device 31, as applicable. For example, as shown in fig. 1, there may be two nitrogen shock wave pulse ash removal devices 31 and two sound wave ash removal devices 31. The first nitrogen shock wave pulse ash cleaning device 31 and the first sound wave ash cleaning device 31 are symmetrically arranged at two sides of the transition flue 3; the second nitrogen shock wave pulse ash removal device 31 and the second sound wave ash removal device 31 are symmetrically arranged at two sides of the transition flue 3; the first nitrogen shock wave pulse ash removal device 31 and the second sound wave ash removal device 31 are positioned on the same side; the second nitrogen shock wave pulse ash cleaning device 31 and the first sound wave ash cleaning device 31 are positioned on the same side. By adopting the mode, the nitrogen shock wave pulse ash removal device 31 and the sound wave ash removal device 31 can be used for simultaneously removing ash, and the heating surface of the heated pipe in the evaporative heat exchanger 2 can be efficiently cleaned by combining the two ash removal devices 31 of different types. In addition, the two different types of ash cleaning devices 31 can clean ash on the heating surface at each position in a symmetrical and staggered mode, and the ash can be prevented from being cleaned in a partial area by only one type of ash cleaning device 31 as far as possible.

As shown in fig. 1, a modular structure can be adopted between a plurality of evaporative heat exchangers 2 and a transition flue 3, each equipment can be independent, and batches can be arranged together in a stacking manner, and meanwhile, the removable connection between each other is realized. For example, the evaporative heat exchanger 2, and the transition flue 3 may be stacked in a vertical direction to form a vertical single-flue box structure. The adjacent equipment is connected in a butt joint mode, namely the outlet of the equipment positioned below faces upwards, the inlet of the equipment positioned above faces downwards, so that the equipment is communicated and butted with each other, and the smoke flows from bottom to top. In other possible embodiments, the outlet of the lower device faces downwards, and the inlet of the upper device faces upwards, so that the lower device and the upper device are communicated and butted, and the smoke flows from top to bottom.

In order to ensure stable firmness of the equipment, the evaporation heat exchanger 2, the transition flue 3 and the like can be supported by the steel frame 7 in the circumferential direction. In another possible embodiment, a plurality of evaporative heat exchangers 2 and transition flues 3 may form a single box structure by being stacked in a horizontal direction.

In both of the above-described modes, a plurality of the evaporative heat exchangers 2 and the transition flues 3 are stacked along a straight line.

Because the plurality of evaporation heat exchangers 2 and the transition flue 3 adopt a modular structure and are arranged in a stacking mode, the evaporation heat exchangers and the transition flue can be detached from each other or the whole evaporation heat exchangers and the transition flue can be detached from each other, and even if the maintenance can not be carried out through the manhole 32 on the flue, part of equipment can be detached for maintenance.

Fig. 2 is the section view of the evaporation heat exchanger in the embodiment of the present invention, fig. 3 is the section view of the radial direction of the evaporation heat exchanger in the embodiment of the present invention, as shown in fig. 2 and fig. 3, the evaporation heat exchanger 2 includes: an inlet header 10 and an outlet header 11, an inlet branch pipe 12 and an outlet branch pipe 13, a communicating pipe 14 and a heated pipe 15. For example, when the evaporation heat exchanger 2, the economizer 4, the closed-cycle heat exchanger 5, and the transition flue 3 are stacked in the vertical direction to form a vertical single-flue box structure, the water inlet header 10 and the water outlet header 11 are respectively located on opposite side walls of the evaporation heat exchanger 2 and extend in the vertical direction. The plurality of inlet branch pipes 12 and the plurality of outlet branch pipes 13 extend in a direction perpendicular to the paper surface, are arranged in a vertical direction, and are respectively located on opposite side walls of the evaporative heat exchanger 2. The plurality of inlet branch pipes 12 are communicated with the inlet header 10 through a communication pipe 14, and the plurality of outlet branch pipes 13 are communicated with the outlet header 11 through a communication pipe 14. The water inlet branch pipes 12 are connected with the corresponding water outlet branch pipes 13 through one or more heated pipes 15, and the heated pipes 15 penetrate through a flue of the evaporative heat exchanger 2. The plurality of heated tubes 15 may be arranged in a vertical direction and in a direction perpendicular to the paper.

Fig. 4 is a schematic diagram illustrating the connection of the heated tubes in the embodiment of the present invention, as shown in fig. 4, each heated tube 15 in the evaporating heat exchanger 2 adopts a single-pass structure without being turned back by 180 degrees, and extends from the water inlet branch pipe 12 to the water outlet branch pipe 13. The height of the water inlet branch pipe 12 can be lower than that of the water outlet branch pipe 13, so that the heated pipe 15 in the evaporation heat exchanger 2 is arranged obliquely, and the inclination angle between the heated pipe and the horizontal plane is more than or equal to 10 degrees. Through the structure, the natural circulation of the steam and the water can be realized by the density difference of the steam and the water, and no additional energy consumption is needed. The joint of the heated tube 15 and the water inlet branch tube 12 has no local low point, so that a dead water area is avoided. The joint of the heated pipe 15 and the water outlet branch pipe 13 has no local high point, so that a gas blockage area is avoided.

Fig. 5 is the structural schematic diagram of the heated tube and the anti-wear cover plate in the embodiment of the present invention, as shown in fig. 5, the windward tube bank of the evaporation heat exchanger 2 can be additionally provided with a heat-resistant steel anti-wear false tube. In addition, the windward side of the heated tube 15 of each section of the evaporative heat exchanger 2 may be provided with a heat-resistant and steel wear-resistant cover plate 16, or in other ways, the windward side of the heated tube 15 may be coated with a protective layer. The abrasion of the heated tube 15 can be reduced in the above manner, and the heated tube 15 can be protected. The wear cover 16 may be secured to the heated tube 15 by a cover retaining clip 17.

As shown in fig. 2 and 3, the side wall of the heat exchange device and the inside of the transition flue 3 can adopt an inner heat-insulating layer 8 structure, the inner heat-insulating layer 8 forms a flue gas flow passage, and the shell of the side wall is completely sealed by a steel plate 9. The outsides of the inlet header 10 and the outlet header 11, the inlet branch pipes 12 and the outlet branch pipes 13, the communication pipes 14, and the like may be closed with steel plates 9. The welding joints of the heated tube 15, the water outlet branch tube 13 and the water inlet branch tube 12 are not positioned in the flue gas flow passage, so that the risk of welding seam leakage can be reduced.

All articles and references disclosed, including patent applications and publications, are incorporated by reference herein for all purposes. The term "consisting essentially of 8230comprises the elements, components or steps identified and other elements, components or steps which do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional. A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

The above description is only a few embodiments of the present invention, and although the embodiments of the present invention are disclosed as above, the above description is only for the convenience of understanding the present invention and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A heat exchange device, comprising:

2. The heat exchange device of claim 1, wherein the plurality of evaporative heat exchangers and the transition flue are of modular construction and are arranged in a stacked arrangement.

3. The heat exchange device of claim 1, wherein the ash removal device comprises a nitrogen shock pulse ash removal device and/or a sonic ash removal device.

4. The heat exchange device according to claim 3, wherein the number of the nitrogen shock wave pulse ash removal devices and the number of the sound wave ash removal devices are two;

5. The heat exchange device of claim 1, wherein a plurality of the evaporative heat exchangers and the transition flue are stacked in a vertical direction to form a vertical single-flue box structure.

6. The heat exchange device of claim 5, wherein the evaporative heat exchanger comprises: the water inlet header and the water outlet header are respectively positioned on the opposite side walls of the evaporation heat exchanger and extend along the vertical direction; the plurality of water inlet branch pipes and the plurality of water outlet branch pipes extend along the direction vertical to the paper surface, are arranged along the vertical direction and are respectively positioned on the opposite side walls of the evaporation heat exchanger; the plurality of water inlet branch pipes are communicated with the water inlet header through the communicating pipe, and the plurality of water outlet branch pipes are communicated with the water outlet header through the communicating pipe; the water inlet branch pipes are connected with the corresponding water outlet branch pipes through one or more heated pipes, and the heated pipes penetrate through a flue of the evaporation heat exchanger; the plurality of heated tubes are arranged in the vertical direction and are arranged in the direction perpendicular to the paper surface.

7. The heat exchange device of claim 5, wherein a plurality of the evaporative heat exchangers, and the transition flue are stacked along a line.

8. The heat exchange device of claim 1, wherein the transition flue is provided with a manhole for maintenance personnel to enter and exit.

9. The heat exchange device according to claim 6, wherein each heated tube in the evaporative heat exchanger adopts a single-pass structure without being folded back by 180 degrees; the heated tubes in the evaporation heat exchanger are arranged in an inclined mode, and the inclined angle between the heated tubes and the horizontal plane is larger than or equal to 10 degrees.

10. The heat exchange device of claim 6, wherein the heated tubes are arranged in-line; the heated tube adopts a light pipe.